thinkpad-acpi: silence bogus warning when ACPI video is disabled
[linux-2.6.git] / drivers / platform / x86 / thinkpad_acpi.c
1 /*
2  *  thinkpad_acpi.c - ThinkPad ACPI Extras
3  *
4  *
5  *  Copyright (C) 2004-2005 Borislav Deianov <borislav@users.sf.net>
6  *  Copyright (C) 2006-2009 Henrique de Moraes Holschuh <hmh@hmh.eng.br>
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21  *  02110-1301, USA.
22  */
23
24 #define TPACPI_VERSION "0.23"
25 #define TPACPI_SYSFS_VERSION 0x020400
26
27 /*
28  *  Changelog:
29  *  2007-10-20          changelog trimmed down
30  *
31  *  2007-03-27  0.14    renamed to thinkpad_acpi and moved to
32  *                      drivers/misc.
33  *
34  *  2006-11-22  0.13    new maintainer
35  *                      changelog now lives in git commit history, and will
36  *                      not be updated further in-file.
37  *
38  *  2005-03-17  0.11    support for 600e, 770x
39  *                          thanks to Jamie Lentin <lentinj@dial.pipex.com>
40  *
41  *  2005-01-16  0.9     use MODULE_VERSION
42  *                          thanks to Henrik Brix Andersen <brix@gentoo.org>
43  *                      fix parameter passing on module loading
44  *                          thanks to Rusty Russell <rusty@rustcorp.com.au>
45  *                          thanks to Jim Radford <radford@blackbean.org>
46  *  2004-11-08  0.8     fix init error case, don't return from a macro
47  *                          thanks to Chris Wright <chrisw@osdl.org>
48  */
49
50 #include <linux/kernel.h>
51 #include <linux/module.h>
52 #include <linux/init.h>
53 #include <linux/types.h>
54 #include <linux/string.h>
55 #include <linux/list.h>
56 #include <linux/mutex.h>
57 #include <linux/sched.h>
58 #include <linux/kthread.h>
59 #include <linux/freezer.h>
60 #include <linux/delay.h>
61
62 #include <linux/nvram.h>
63 #include <linux/proc_fs.h>
64 #include <linux/sysfs.h>
65 #include <linux/backlight.h>
66 #include <linux/fb.h>
67 #include <linux/platform_device.h>
68 #include <linux/hwmon.h>
69 #include <linux/hwmon-sysfs.h>
70 #include <linux/input.h>
71 #include <linux/leds.h>
72 #include <linux/rfkill.h>
73 #include <asm/uaccess.h>
74
75 #include <linux/dmi.h>
76 #include <linux/jiffies.h>
77 #include <linux/workqueue.h>
78
79 #include <acpi/acpi_drivers.h>
80
81 #include <linux/pci_ids.h>
82
83
84 /* ThinkPad CMOS commands */
85 #define TP_CMOS_VOLUME_DOWN     0
86 #define TP_CMOS_VOLUME_UP       1
87 #define TP_CMOS_VOLUME_MUTE     2
88 #define TP_CMOS_BRIGHTNESS_UP   4
89 #define TP_CMOS_BRIGHTNESS_DOWN 5
90 #define TP_CMOS_THINKLIGHT_ON   12
91 #define TP_CMOS_THINKLIGHT_OFF  13
92
93 /* NVRAM Addresses */
94 enum tp_nvram_addr {
95         TP_NVRAM_ADDR_HK2               = 0x57,
96         TP_NVRAM_ADDR_THINKLIGHT        = 0x58,
97         TP_NVRAM_ADDR_VIDEO             = 0x59,
98         TP_NVRAM_ADDR_BRIGHTNESS        = 0x5e,
99         TP_NVRAM_ADDR_MIXER             = 0x60,
100 };
101
102 /* NVRAM bit masks */
103 enum {
104         TP_NVRAM_MASK_HKT_THINKPAD      = 0x08,
105         TP_NVRAM_MASK_HKT_ZOOM          = 0x20,
106         TP_NVRAM_MASK_HKT_DISPLAY       = 0x40,
107         TP_NVRAM_MASK_HKT_HIBERNATE     = 0x80,
108         TP_NVRAM_MASK_THINKLIGHT        = 0x10,
109         TP_NVRAM_MASK_HKT_DISPEXPND     = 0x30,
110         TP_NVRAM_MASK_HKT_BRIGHTNESS    = 0x20,
111         TP_NVRAM_MASK_LEVEL_BRIGHTNESS  = 0x0f,
112         TP_NVRAM_POS_LEVEL_BRIGHTNESS   = 0,
113         TP_NVRAM_MASK_MUTE              = 0x40,
114         TP_NVRAM_MASK_HKT_VOLUME        = 0x80,
115         TP_NVRAM_MASK_LEVEL_VOLUME      = 0x0f,
116         TP_NVRAM_POS_LEVEL_VOLUME       = 0,
117 };
118
119 /* ACPI HIDs */
120 #define TPACPI_ACPI_HKEY_HID            "IBM0068"
121
122 /* Input IDs */
123 #define TPACPI_HKEY_INPUT_PRODUCT       0x5054 /* "TP" */
124 #define TPACPI_HKEY_INPUT_VERSION       0x4101
125
126 /* ACPI \WGSV commands */
127 enum {
128         TP_ACPI_WGSV_GET_STATE          = 0x01, /* Get state information */
129         TP_ACPI_WGSV_PWR_ON_ON_RESUME   = 0x02, /* Resume WWAN powered on */
130         TP_ACPI_WGSV_PWR_OFF_ON_RESUME  = 0x03, /* Resume WWAN powered off */
131         TP_ACPI_WGSV_SAVE_STATE         = 0x04, /* Save state for S4/S5 */
132 };
133
134 /* TP_ACPI_WGSV_GET_STATE bits */
135 enum {
136         TP_ACPI_WGSV_STATE_WWANEXIST    = 0x0001, /* WWAN hw available */
137         TP_ACPI_WGSV_STATE_WWANPWR      = 0x0002, /* WWAN radio enabled */
138         TP_ACPI_WGSV_STATE_WWANPWRRES   = 0x0004, /* WWAN state at resume */
139         TP_ACPI_WGSV_STATE_WWANBIOSOFF  = 0x0008, /* WWAN disabled in BIOS */
140         TP_ACPI_WGSV_STATE_BLTHEXIST    = 0x0001, /* BLTH hw available */
141         TP_ACPI_WGSV_STATE_BLTHPWR      = 0x0002, /* BLTH radio enabled */
142         TP_ACPI_WGSV_STATE_BLTHPWRRES   = 0x0004, /* BLTH state at resume */
143         TP_ACPI_WGSV_STATE_BLTHBIOSOFF  = 0x0008, /* BLTH disabled in BIOS */
144         TP_ACPI_WGSV_STATE_UWBEXIST     = 0x0010, /* UWB hw available */
145         TP_ACPI_WGSV_STATE_UWBPWR       = 0x0020, /* UWB radio enabled */
146 };
147
148 /****************************************************************************
149  * Main driver
150  */
151
152 #define TPACPI_NAME "thinkpad"
153 #define TPACPI_DESC "ThinkPad ACPI Extras"
154 #define TPACPI_FILE TPACPI_NAME "_acpi"
155 #define TPACPI_URL "http://ibm-acpi.sf.net/"
156 #define TPACPI_MAIL "ibm-acpi-devel@lists.sourceforge.net"
157
158 #define TPACPI_PROC_DIR "ibm"
159 #define TPACPI_ACPI_EVENT_PREFIX "ibm"
160 #define TPACPI_DRVR_NAME TPACPI_FILE
161 #define TPACPI_DRVR_SHORTNAME "tpacpi"
162 #define TPACPI_HWMON_DRVR_NAME TPACPI_NAME "_hwmon"
163
164 #define TPACPI_NVRAM_KTHREAD_NAME "ktpacpi_nvramd"
165 #define TPACPI_WORKQUEUE_NAME "ktpacpid"
166
167 #define TPACPI_MAX_ACPI_ARGS 3
168
169 /* rfkill switches */
170 enum {
171         TPACPI_RFK_BLUETOOTH_SW_ID = 0,
172         TPACPI_RFK_WWAN_SW_ID,
173         TPACPI_RFK_UWB_SW_ID,
174 };
175
176 /* printk headers */
177 #define TPACPI_LOG TPACPI_FILE ": "
178 #define TPACPI_EMERG    KERN_EMERG      TPACPI_LOG
179 #define TPACPI_ALERT    KERN_ALERT      TPACPI_LOG
180 #define TPACPI_CRIT     KERN_CRIT       TPACPI_LOG
181 #define TPACPI_ERR      KERN_ERR        TPACPI_LOG
182 #define TPACPI_WARN     KERN_WARNING    TPACPI_LOG
183 #define TPACPI_NOTICE   KERN_NOTICE     TPACPI_LOG
184 #define TPACPI_INFO     KERN_INFO       TPACPI_LOG
185 #define TPACPI_DEBUG    KERN_DEBUG      TPACPI_LOG
186
187 /* Debugging printk groups */
188 #define TPACPI_DBG_ALL          0xffff
189 #define TPACPI_DBG_DISCLOSETASK 0x8000
190 #define TPACPI_DBG_INIT         0x0001
191 #define TPACPI_DBG_EXIT         0x0002
192 #define TPACPI_DBG_RFKILL       0x0004
193 #define TPACPI_DBG_HKEY         0x0008
194 #define TPACPI_DBG_FAN          0x0010
195 #define TPACPI_DBG_BRGHT        0x0020
196
197 #define onoff(status, bit) ((status) & (1 << (bit)) ? "on" : "off")
198 #define enabled(status, bit) ((status) & (1 << (bit)) ? "enabled" : "disabled")
199 #define strlencmp(a, b) (strncmp((a), (b), strlen(b)))
200
201
202 /****************************************************************************
203  * Driver-wide structs and misc. variables
204  */
205
206 struct ibm_struct;
207
208 struct tp_acpi_drv_struct {
209         const struct acpi_device_id *hid;
210         struct acpi_driver *driver;
211
212         void (*notify) (struct ibm_struct *, u32);
213         acpi_handle *handle;
214         u32 type;
215         struct acpi_device *device;
216 };
217
218 struct ibm_struct {
219         char *name;
220
221         int (*read) (char *);
222         int (*write) (char *);
223         void (*exit) (void);
224         void (*resume) (void);
225         void (*suspend) (pm_message_t state);
226         void (*shutdown) (void);
227
228         struct list_head all_drivers;
229
230         struct tp_acpi_drv_struct *acpi;
231
232         struct {
233                 u8 acpi_driver_registered:1;
234                 u8 acpi_notify_installed:1;
235                 u8 proc_created:1;
236                 u8 init_called:1;
237                 u8 experimental:1;
238         } flags;
239 };
240
241 struct ibm_init_struct {
242         char param[32];
243
244         int (*init) (struct ibm_init_struct *);
245         struct ibm_struct *data;
246 };
247
248 static struct {
249 #ifdef CONFIG_THINKPAD_ACPI_BAY
250         u32 bay_status:1;
251         u32 bay_eject:1;
252         u32 bay_status2:1;
253         u32 bay_eject2:1;
254 #endif
255         u32 bluetooth:1;
256         u32 hotkey:1;
257         u32 hotkey_mask:1;
258         u32 hotkey_wlsw:1;
259         u32 hotkey_tablet:1;
260         u32 light:1;
261         u32 light_status:1;
262         u32 bright_16levels:1;
263         u32 bright_acpimode:1;
264         u32 wan:1;
265         u32 uwb:1;
266         u32 fan_ctrl_status_undef:1;
267         u32 beep_needs_two_args:1;
268         u32 input_device_registered:1;
269         u32 platform_drv_registered:1;
270         u32 platform_drv_attrs_registered:1;
271         u32 sensors_pdrv_registered:1;
272         u32 sensors_pdrv_attrs_registered:1;
273         u32 sensors_pdev_attrs_registered:1;
274         u32 hotkey_poll_active:1;
275 } tp_features;
276
277 static struct {
278         u16 hotkey_mask_ff:1;
279 } tp_warned;
280
281 struct thinkpad_id_data {
282         unsigned int vendor;    /* ThinkPad vendor:
283                                  * PCI_VENDOR_ID_IBM/PCI_VENDOR_ID_LENOVO */
284
285         char *bios_version_str; /* Something like 1ZET51WW (1.03z) */
286         char *ec_version_str;   /* Something like 1ZHT51WW-1.04a */
287
288         u16 bios_model;         /* 1Y = 0x5931, 0 = unknown */
289         u16 ec_model;
290         u16 bios_release;       /* 1ZETK1WW = 0x314b, 0 = unknown */
291         u16 ec_release;
292
293         char *model_str;        /* ThinkPad T43 */
294         char *nummodel_str;     /* 9384A9C for a 9384-A9C model */
295 };
296 static struct thinkpad_id_data thinkpad_id;
297
298 static enum {
299         TPACPI_LIFE_INIT = 0,
300         TPACPI_LIFE_RUNNING,
301         TPACPI_LIFE_EXITING,
302 } tpacpi_lifecycle;
303
304 static int experimental;
305 static u32 dbg_level;
306
307 static struct workqueue_struct *tpacpi_wq;
308
309 enum led_status_t {
310         TPACPI_LED_OFF = 0,
311         TPACPI_LED_ON,
312         TPACPI_LED_BLINK,
313 };
314
315 /* Special LED class that can defer work */
316 struct tpacpi_led_classdev {
317         struct led_classdev led_classdev;
318         struct work_struct work;
319         enum led_status_t new_state;
320         unsigned int led;
321 };
322
323 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
324 static int dbg_wlswemul;
325 static int tpacpi_wlsw_emulstate;
326 static int dbg_bluetoothemul;
327 static int tpacpi_bluetooth_emulstate;
328 static int dbg_wwanemul;
329 static int tpacpi_wwan_emulstate;
330 static int dbg_uwbemul;
331 static int tpacpi_uwb_emulstate;
332 #endif
333
334
335 /*************************************************************************
336  *  Debugging helpers
337  */
338
339 #define dbg_printk(a_dbg_level, format, arg...) \
340         do { if (dbg_level & (a_dbg_level)) \
341                 printk(TPACPI_DEBUG "%s: " format, __func__ , ## arg); \
342         } while (0)
343
344 #ifdef CONFIG_THINKPAD_ACPI_DEBUG
345 #define vdbg_printk dbg_printk
346 static const char *str_supported(int is_supported);
347 #else
348 #define vdbg_printk(a_dbg_level, format, arg...) \
349         do { } while (0)
350 #endif
351
352 static void tpacpi_log_usertask(const char * const what)
353 {
354         printk(TPACPI_DEBUG "%s: access by process with PID %d\n",
355                 what, task_tgid_vnr(current));
356 }
357
358 #define tpacpi_disclose_usertask(what, format, arg...) \
359         do { \
360                 if (unlikely( \
361                     (dbg_level & TPACPI_DBG_DISCLOSETASK) && \
362                     (tpacpi_lifecycle == TPACPI_LIFE_RUNNING))) { \
363                         printk(TPACPI_DEBUG "%s: PID %d: " format, \
364                                 what, task_tgid_vnr(current), ## arg); \
365                 } \
366         } while (0)
367
368 /*
369  * Quirk handling helpers
370  *
371  * ThinkPad IDs and versions seen in the field so far
372  * are two-characters from the set [0-9A-Z], i.e. base 36.
373  *
374  * We use values well outside that range as specials.
375  */
376
377 #define TPACPI_MATCH_ANY                0xffffU
378 #define TPACPI_MATCH_UNKNOWN            0U
379
380 /* TPID('1', 'Y') == 0x5931 */
381 #define TPID(__c1, __c2) (((__c2) << 8) | (__c1))
382
383 #define TPACPI_Q_IBM(__id1, __id2, __quirk)     \
384         { .vendor = PCI_VENDOR_ID_IBM,          \
385           .bios = TPID(__id1, __id2),           \
386           .ec = TPACPI_MATCH_ANY,               \
387           .quirks = (__quirk) }
388
389 #define TPACPI_Q_LNV(__id1, __id2, __quirk)     \
390         { .vendor = PCI_VENDOR_ID_LENOVO,       \
391           .bios = TPID(__id1, __id2),           \
392           .ec = TPACPI_MATCH_ANY,               \
393           .quirks = (__quirk) }
394
395 struct tpacpi_quirk {
396         unsigned int vendor;
397         u16 bios;
398         u16 ec;
399         unsigned long quirks;
400 };
401
402 /**
403  * tpacpi_check_quirks() - search BIOS/EC version on a list
404  * @qlist:              array of &struct tpacpi_quirk
405  * @qlist_size:         number of elements in @qlist
406  *
407  * Iterates over a quirks list until one is found that matches the
408  * ThinkPad's vendor, BIOS and EC model.
409  *
410  * Returns 0 if nothing matches, otherwise returns the quirks field of
411  * the matching &struct tpacpi_quirk entry.
412  *
413  * The match criteria is: vendor, ec and bios much match.
414  */
415 static unsigned long __init tpacpi_check_quirks(
416                         const struct tpacpi_quirk *qlist,
417                         unsigned int qlist_size)
418 {
419         while (qlist_size) {
420                 if ((qlist->vendor == thinkpad_id.vendor ||
421                                 qlist->vendor == TPACPI_MATCH_ANY) &&
422                     (qlist->bios == thinkpad_id.bios_model ||
423                                 qlist->bios == TPACPI_MATCH_ANY) &&
424                     (qlist->ec == thinkpad_id.ec_model ||
425                                 qlist->ec == TPACPI_MATCH_ANY))
426                         return qlist->quirks;
427
428                 qlist_size--;
429                 qlist++;
430         }
431         return 0;
432 }
433
434
435 /****************************************************************************
436  ****************************************************************************
437  *
438  * ACPI Helpers and device model
439  *
440  ****************************************************************************
441  ****************************************************************************/
442
443 /*************************************************************************
444  * ACPI basic handles
445  */
446
447 static acpi_handle root_handle;
448
449 #define TPACPI_HANDLE(object, parent, paths...)                 \
450         static acpi_handle  object##_handle;                    \
451         static acpi_handle *object##_parent = &parent##_handle; \
452         static char        *object##_path;                      \
453         static char        *object##_paths[] = { paths }
454
455 TPACPI_HANDLE(ec, root, "\\_SB.PCI0.ISA.EC0",   /* 240, 240x */
456            "\\_SB.PCI.ISA.EC",  /* 570 */
457            "\\_SB.PCI0.ISA0.EC0",       /* 600e/x, 770e, 770x */
458            "\\_SB.PCI0.ISA.EC", /* A21e, A2xm/p, T20-22, X20-21 */
459            "\\_SB.PCI0.AD4S.EC0",       /* i1400, R30 */
460            "\\_SB.PCI0.ICH3.EC0",       /* R31 */
461            "\\_SB.PCI0.LPC.EC", /* all others */
462            );
463
464 TPACPI_HANDLE(ecrd, ec, "ECRD");        /* 570 */
465 TPACPI_HANDLE(ecwr, ec, "ECWR");        /* 570 */
466
467 TPACPI_HANDLE(cmos, root, "\\UCMS",     /* R50, R50e, R50p, R51, */
468                                         /* T4x, X31, X40 */
469            "\\CMOS",            /* A3x, G4x, R32, T23, T30, X22-24, X30 */
470            "\\CMS",             /* R40, R40e */
471            );                   /* all others */
472
473 TPACPI_HANDLE(hkey, ec, "\\_SB.HKEY",   /* 600e/x, 770e, 770x */
474            "^HKEY",             /* R30, R31 */
475            "HKEY",              /* all others */
476            );                   /* 570 */
477
478 TPACPI_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",   /* 570 */
479            "\\_SB.PCI0.AGP0.VID0",      /* 600e/x, 770x */
480            "\\_SB.PCI0.VID0",   /* 770e */
481            "\\_SB.PCI0.VID",    /* A21e, G4x, R50e, X30, X40 */
482            "\\_SB.PCI0.AGP.VID",        /* all others */
483            );                           /* R30, R31 */
484
485
486 /*************************************************************************
487  * ACPI helpers
488  */
489
490 static int acpi_evalf(acpi_handle handle,
491                       void *res, char *method, char *fmt, ...)
492 {
493         char *fmt0 = fmt;
494         struct acpi_object_list params;
495         union acpi_object in_objs[TPACPI_MAX_ACPI_ARGS];
496         struct acpi_buffer result, *resultp;
497         union acpi_object out_obj;
498         acpi_status status;
499         va_list ap;
500         char res_type;
501         int success;
502         int quiet;
503
504         if (!*fmt) {
505                 printk(TPACPI_ERR "acpi_evalf() called with empty format\n");
506                 return 0;
507         }
508
509         if (*fmt == 'q') {
510                 quiet = 1;
511                 fmt++;
512         } else
513                 quiet = 0;
514
515         res_type = *(fmt++);
516
517         params.count = 0;
518         params.pointer = &in_objs[0];
519
520         va_start(ap, fmt);
521         while (*fmt) {
522                 char c = *(fmt++);
523                 switch (c) {
524                 case 'd':       /* int */
525                         in_objs[params.count].integer.value = va_arg(ap, int);
526                         in_objs[params.count++].type = ACPI_TYPE_INTEGER;
527                         break;
528                         /* add more types as needed */
529                 default:
530                         printk(TPACPI_ERR "acpi_evalf() called "
531                                "with invalid format character '%c'\n", c);
532                         return 0;
533                 }
534         }
535         va_end(ap);
536
537         if (res_type != 'v') {
538                 result.length = sizeof(out_obj);
539                 result.pointer = &out_obj;
540                 resultp = &result;
541         } else
542                 resultp = NULL;
543
544         status = acpi_evaluate_object(handle, method, &params, resultp);
545
546         switch (res_type) {
547         case 'd':               /* int */
548                 if (res)
549                         *(int *)res = out_obj.integer.value;
550                 success = status == AE_OK && out_obj.type == ACPI_TYPE_INTEGER;
551                 break;
552         case 'v':               /* void */
553                 success = status == AE_OK;
554                 break;
555                 /* add more types as needed */
556         default:
557                 printk(TPACPI_ERR "acpi_evalf() called "
558                        "with invalid format character '%c'\n", res_type);
559                 return 0;
560         }
561
562         if (!success && !quiet)
563                 printk(TPACPI_ERR "acpi_evalf(%s, %s, ...) failed: %d\n",
564                        method, fmt0, status);
565
566         return success;
567 }
568
569 static int acpi_ec_read(int i, u8 *p)
570 {
571         int v;
572
573         if (ecrd_handle) {
574                 if (!acpi_evalf(ecrd_handle, &v, NULL, "dd", i))
575                         return 0;
576                 *p = v;
577         } else {
578                 if (ec_read(i, p) < 0)
579                         return 0;
580         }
581
582         return 1;
583 }
584
585 static int acpi_ec_write(int i, u8 v)
586 {
587         if (ecwr_handle) {
588                 if (!acpi_evalf(ecwr_handle, NULL, NULL, "vdd", i, v))
589                         return 0;
590         } else {
591                 if (ec_write(i, v) < 0)
592                         return 0;
593         }
594
595         return 1;
596 }
597
598 #if defined(CONFIG_THINKPAD_ACPI_DOCK) || defined(CONFIG_THINKPAD_ACPI_BAY)
599 static int _sta(acpi_handle handle)
600 {
601         int status;
602
603         if (!handle || !acpi_evalf(handle, &status, "_STA", "d"))
604                 status = 0;
605
606         return status;
607 }
608 #endif
609
610 static int issue_thinkpad_cmos_command(int cmos_cmd)
611 {
612         if (!cmos_handle)
613                 return -ENXIO;
614
615         if (!acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd))
616                 return -EIO;
617
618         return 0;
619 }
620
621 /*************************************************************************
622  * ACPI device model
623  */
624
625 #define TPACPI_ACPIHANDLE_INIT(object) \
626         drv_acpi_handle_init(#object, &object##_handle, *object##_parent, \
627                 object##_paths, ARRAY_SIZE(object##_paths), &object##_path)
628
629 static void drv_acpi_handle_init(char *name,
630                            acpi_handle *handle, acpi_handle parent,
631                            char **paths, int num_paths, char **path)
632 {
633         int i;
634         acpi_status status;
635
636         vdbg_printk(TPACPI_DBG_INIT, "trying to locate ACPI handle for %s\n",
637                 name);
638
639         for (i = 0; i < num_paths; i++) {
640                 status = acpi_get_handle(parent, paths[i], handle);
641                 if (ACPI_SUCCESS(status)) {
642                         *path = paths[i];
643                         dbg_printk(TPACPI_DBG_INIT,
644                                    "Found ACPI handle %s for %s\n",
645                                    *path, name);
646                         return;
647                 }
648         }
649
650         vdbg_printk(TPACPI_DBG_INIT, "ACPI handle for %s not found\n",
651                     name);
652         *handle = NULL;
653 }
654
655 static void dispatch_acpi_notify(acpi_handle handle, u32 event, void *data)
656 {
657         struct ibm_struct *ibm = data;
658
659         if (tpacpi_lifecycle != TPACPI_LIFE_RUNNING)
660                 return;
661
662         if (!ibm || !ibm->acpi || !ibm->acpi->notify)
663                 return;
664
665         ibm->acpi->notify(ibm, event);
666 }
667
668 static int __init setup_acpi_notify(struct ibm_struct *ibm)
669 {
670         acpi_status status;
671         int rc;
672
673         BUG_ON(!ibm->acpi);
674
675         if (!*ibm->acpi->handle)
676                 return 0;
677
678         vdbg_printk(TPACPI_DBG_INIT,
679                 "setting up ACPI notify for %s\n", ibm->name);
680
681         rc = acpi_bus_get_device(*ibm->acpi->handle, &ibm->acpi->device);
682         if (rc < 0) {
683                 printk(TPACPI_ERR "acpi_bus_get_device(%s) failed: %d\n",
684                         ibm->name, rc);
685                 return -ENODEV;
686         }
687
688         ibm->acpi->device->driver_data = ibm;
689         sprintf(acpi_device_class(ibm->acpi->device), "%s/%s",
690                 TPACPI_ACPI_EVENT_PREFIX,
691                 ibm->name);
692
693         status = acpi_install_notify_handler(*ibm->acpi->handle,
694                         ibm->acpi->type, dispatch_acpi_notify, ibm);
695         if (ACPI_FAILURE(status)) {
696                 if (status == AE_ALREADY_EXISTS) {
697                         printk(TPACPI_NOTICE
698                                "another device driver is already "
699                                "handling %s events\n", ibm->name);
700                 } else {
701                         printk(TPACPI_ERR
702                                "acpi_install_notify_handler(%s) failed: %d\n",
703                                ibm->name, status);
704                 }
705                 return -ENODEV;
706         }
707         ibm->flags.acpi_notify_installed = 1;
708         return 0;
709 }
710
711 static int __init tpacpi_device_add(struct acpi_device *device)
712 {
713         return 0;
714 }
715
716 static int __init register_tpacpi_subdriver(struct ibm_struct *ibm)
717 {
718         int rc;
719
720         dbg_printk(TPACPI_DBG_INIT,
721                 "registering %s as an ACPI driver\n", ibm->name);
722
723         BUG_ON(!ibm->acpi);
724
725         ibm->acpi->driver = kzalloc(sizeof(struct acpi_driver), GFP_KERNEL);
726         if (!ibm->acpi->driver) {
727                 printk(TPACPI_ERR
728                        "failed to allocate memory for ibm->acpi->driver\n");
729                 return -ENOMEM;
730         }
731
732         sprintf(ibm->acpi->driver->name, "%s_%s", TPACPI_NAME, ibm->name);
733         ibm->acpi->driver->ids = ibm->acpi->hid;
734
735         ibm->acpi->driver->ops.add = &tpacpi_device_add;
736
737         rc = acpi_bus_register_driver(ibm->acpi->driver);
738         if (rc < 0) {
739                 printk(TPACPI_ERR "acpi_bus_register_driver(%s) failed: %d\n",
740                        ibm->name, rc);
741                 kfree(ibm->acpi->driver);
742                 ibm->acpi->driver = NULL;
743         } else if (!rc)
744                 ibm->flags.acpi_driver_registered = 1;
745
746         return rc;
747 }
748
749
750 /****************************************************************************
751  ****************************************************************************
752  *
753  * Procfs Helpers
754  *
755  ****************************************************************************
756  ****************************************************************************/
757
758 static int dispatch_procfs_read(char *page, char **start, off_t off,
759                         int count, int *eof, void *data)
760 {
761         struct ibm_struct *ibm = data;
762         int len;
763
764         if (!ibm || !ibm->read)
765                 return -EINVAL;
766
767         len = ibm->read(page);
768         if (len < 0)
769                 return len;
770
771         if (len <= off + count)
772                 *eof = 1;
773         *start = page + off;
774         len -= off;
775         if (len > count)
776                 len = count;
777         if (len < 0)
778                 len = 0;
779
780         return len;
781 }
782
783 static int dispatch_procfs_write(struct file *file,
784                         const char __user *userbuf,
785                         unsigned long count, void *data)
786 {
787         struct ibm_struct *ibm = data;
788         char *kernbuf;
789         int ret;
790
791         if (!ibm || !ibm->write)
792                 return -EINVAL;
793
794         kernbuf = kmalloc(count + 2, GFP_KERNEL);
795         if (!kernbuf)
796                 return -ENOMEM;
797
798         if (copy_from_user(kernbuf, userbuf, count)) {
799                 kfree(kernbuf);
800                 return -EFAULT;
801         }
802
803         kernbuf[count] = 0;
804         strcat(kernbuf, ",");
805         ret = ibm->write(kernbuf);
806         if (ret == 0)
807                 ret = count;
808
809         kfree(kernbuf);
810
811         return ret;
812 }
813
814 static char *next_cmd(char **cmds)
815 {
816         char *start = *cmds;
817         char *end;
818
819         while ((end = strchr(start, ',')) && end == start)
820                 start = end + 1;
821
822         if (!end)
823                 return NULL;
824
825         *end = 0;
826         *cmds = end + 1;
827         return start;
828 }
829
830
831 /****************************************************************************
832  ****************************************************************************
833  *
834  * Device model: input, hwmon and platform
835  *
836  ****************************************************************************
837  ****************************************************************************/
838
839 static struct platform_device *tpacpi_pdev;
840 static struct platform_device *tpacpi_sensors_pdev;
841 static struct device *tpacpi_hwmon;
842 static struct input_dev *tpacpi_inputdev;
843 static struct mutex tpacpi_inputdev_send_mutex;
844 static LIST_HEAD(tpacpi_all_drivers);
845
846 static int tpacpi_suspend_handler(struct platform_device *pdev,
847                                   pm_message_t state)
848 {
849         struct ibm_struct *ibm, *itmp;
850
851         list_for_each_entry_safe(ibm, itmp,
852                                  &tpacpi_all_drivers,
853                                  all_drivers) {
854                 if (ibm->suspend)
855                         (ibm->suspend)(state);
856         }
857
858         return 0;
859 }
860
861 static int tpacpi_resume_handler(struct platform_device *pdev)
862 {
863         struct ibm_struct *ibm, *itmp;
864
865         list_for_each_entry_safe(ibm, itmp,
866                                  &tpacpi_all_drivers,
867                                  all_drivers) {
868                 if (ibm->resume)
869                         (ibm->resume)();
870         }
871
872         return 0;
873 }
874
875 static void tpacpi_shutdown_handler(struct platform_device *pdev)
876 {
877         struct ibm_struct *ibm, *itmp;
878
879         list_for_each_entry_safe(ibm, itmp,
880                                  &tpacpi_all_drivers,
881                                  all_drivers) {
882                 if (ibm->shutdown)
883                         (ibm->shutdown)();
884         }
885 }
886
887 static struct platform_driver tpacpi_pdriver = {
888         .driver = {
889                 .name = TPACPI_DRVR_NAME,
890                 .owner = THIS_MODULE,
891         },
892         .suspend = tpacpi_suspend_handler,
893         .resume = tpacpi_resume_handler,
894         .shutdown = tpacpi_shutdown_handler,
895 };
896
897 static struct platform_driver tpacpi_hwmon_pdriver = {
898         .driver = {
899                 .name = TPACPI_HWMON_DRVR_NAME,
900                 .owner = THIS_MODULE,
901         },
902 };
903
904 /*************************************************************************
905  * sysfs support helpers
906  */
907
908 struct attribute_set {
909         unsigned int members, max_members;
910         struct attribute_group group;
911 };
912
913 struct attribute_set_obj {
914         struct attribute_set s;
915         struct attribute *a;
916 } __attribute__((packed));
917
918 static struct attribute_set *create_attr_set(unsigned int max_members,
919                                                 const char *name)
920 {
921         struct attribute_set_obj *sobj;
922
923         if (max_members == 0)
924                 return NULL;
925
926         /* Allocates space for implicit NULL at the end too */
927         sobj = kzalloc(sizeof(struct attribute_set_obj) +
928                     max_members * sizeof(struct attribute *),
929                     GFP_KERNEL);
930         if (!sobj)
931                 return NULL;
932         sobj->s.max_members = max_members;
933         sobj->s.group.attrs = &sobj->a;
934         sobj->s.group.name = name;
935
936         return &sobj->s;
937 }
938
939 #define destroy_attr_set(_set) \
940         kfree(_set);
941
942 /* not multi-threaded safe, use it in a single thread per set */
943 static int add_to_attr_set(struct attribute_set *s, struct attribute *attr)
944 {
945         if (!s || !attr)
946                 return -EINVAL;
947
948         if (s->members >= s->max_members)
949                 return -ENOMEM;
950
951         s->group.attrs[s->members] = attr;
952         s->members++;
953
954         return 0;
955 }
956
957 static int add_many_to_attr_set(struct attribute_set *s,
958                         struct attribute **attr,
959                         unsigned int count)
960 {
961         int i, res;
962
963         for (i = 0; i < count; i++) {
964                 res = add_to_attr_set(s, attr[i]);
965                 if (res)
966                         return res;
967         }
968
969         return 0;
970 }
971
972 static void delete_attr_set(struct attribute_set *s, struct kobject *kobj)
973 {
974         sysfs_remove_group(kobj, &s->group);
975         destroy_attr_set(s);
976 }
977
978 #define register_attr_set_with_sysfs(_attr_set, _kobj) \
979         sysfs_create_group(_kobj, &_attr_set->group)
980
981 static int parse_strtoul(const char *buf,
982                 unsigned long max, unsigned long *value)
983 {
984         char *endp;
985
986         while (*buf && isspace(*buf))
987                 buf++;
988         *value = simple_strtoul(buf, &endp, 0);
989         while (*endp && isspace(*endp))
990                 endp++;
991         if (*endp || *value > max)
992                 return -EINVAL;
993
994         return 0;
995 }
996
997 static void tpacpi_disable_brightness_delay(void)
998 {
999         if (acpi_evalf(hkey_handle, NULL, "PWMS", "qvd", 0))
1000                 printk(TPACPI_NOTICE
1001                         "ACPI backlight control delay disabled\n");
1002 }
1003
1004 static int __init tpacpi_query_bcl_levels(acpi_handle handle)
1005 {
1006         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1007         union acpi_object *obj;
1008         int rc;
1009
1010         if (ACPI_SUCCESS(acpi_evaluate_object(handle, NULL, NULL, &buffer))) {
1011                 obj = (union acpi_object *)buffer.pointer;
1012                 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
1013                         printk(TPACPI_ERR "Unknown _BCL data, "
1014                                "please report this to %s\n", TPACPI_MAIL);
1015                         rc = 0;
1016                 } else {
1017                         rc = obj->package.count;
1018                 }
1019         } else {
1020                 return 0;
1021         }
1022
1023         kfree(buffer.pointer);
1024         return rc;
1025 }
1026
1027 static acpi_status __init tpacpi_acpi_walk_find_bcl(acpi_handle handle,
1028                                         u32 lvl, void *context, void **rv)
1029 {
1030         char name[ACPI_PATH_SEGMENT_LENGTH];
1031         struct acpi_buffer buffer = { sizeof(name), &name };
1032
1033         if (ACPI_SUCCESS(acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer)) &&
1034             !strncmp("_BCL", name, sizeof(name) - 1)) {
1035                 BUG_ON(!rv || !*rv);
1036                 **(int **)rv = tpacpi_query_bcl_levels(handle);
1037                 return AE_CTRL_TERMINATE;
1038         } else {
1039                 return AE_OK;
1040         }
1041 }
1042
1043 /*
1044  * Returns 0 (no ACPI _BCL or _BCL invalid), or size of brightness map
1045  */
1046 static int __init tpacpi_check_std_acpi_brightness_support(void)
1047 {
1048         int status;
1049         int bcl_levels = 0;
1050         void *bcl_ptr = &bcl_levels;
1051
1052         if (!vid_handle) {
1053                 TPACPI_ACPIHANDLE_INIT(vid);
1054         }
1055         if (!vid_handle)
1056                 return 0;
1057
1058         /*
1059          * Search for a _BCL method, and execute it.  This is safe on all
1060          * ThinkPads, and as a side-effect, _BCL will place a Lenovo Vista
1061          * BIOS in ACPI backlight control mode.  We do NOT have to care
1062          * about calling the _BCL method in an enabled video device, any
1063          * will do for our purposes.
1064          */
1065
1066         status = acpi_walk_namespace(ACPI_TYPE_METHOD, vid_handle, 3,
1067                                      tpacpi_acpi_walk_find_bcl, NULL,
1068                                      &bcl_ptr);
1069
1070         if (ACPI_SUCCESS(status) && bcl_levels > 2) {
1071                 tp_features.bright_acpimode = 1;
1072                 return (bcl_levels - 2);
1073         }
1074
1075         return 0;
1076 }
1077
1078 static int __init tpacpi_new_rfkill(const unsigned int id,
1079                         struct rfkill **rfk,
1080                         const enum rfkill_type rfktype,
1081                         const char *name,
1082                         const bool set_default,
1083                         int (*toggle_radio)(void *, enum rfkill_state),
1084                         int (*get_state)(void *, enum rfkill_state *))
1085 {
1086         int res;
1087         enum rfkill_state initial_state = RFKILL_STATE_SOFT_BLOCKED;
1088
1089         res = get_state(NULL, &initial_state);
1090         if (res < 0) {
1091                 printk(TPACPI_ERR
1092                         "failed to read initial state for %s, error %d; "
1093                         "will turn radio off\n", name, res);
1094         } else if (set_default) {
1095                 /* try to set the initial state as the default for the rfkill
1096                  * type, since we ask the firmware to preserve it across S5 in
1097                  * NVRAM */
1098                 if (rfkill_set_default(rfktype,
1099                                 (initial_state == RFKILL_STATE_UNBLOCKED) ?
1100                                         RFKILL_STATE_UNBLOCKED :
1101                                         RFKILL_STATE_SOFT_BLOCKED) == -EPERM)
1102                         vdbg_printk(TPACPI_DBG_RFKILL,
1103                                     "Default state for %s cannot be changed\n",
1104                                     name);
1105         }
1106
1107         *rfk = rfkill_allocate(&tpacpi_pdev->dev, rfktype);
1108         if (!*rfk) {
1109                 printk(TPACPI_ERR
1110                         "failed to allocate memory for rfkill class\n");
1111                 return -ENOMEM;
1112         }
1113
1114         (*rfk)->name = name;
1115         (*rfk)->get_state = get_state;
1116         (*rfk)->toggle_radio = toggle_radio;
1117         (*rfk)->state = initial_state;
1118
1119         res = rfkill_register(*rfk);
1120         if (res < 0) {
1121                 printk(TPACPI_ERR
1122                         "failed to register %s rfkill switch: %d\n",
1123                         name, res);
1124                 rfkill_free(*rfk);
1125                 *rfk = NULL;
1126                 return res;
1127         }
1128
1129         return 0;
1130 }
1131
1132 static void printk_deprecated_attribute(const char * const what,
1133                                         const char * const details)
1134 {
1135         tpacpi_log_usertask("deprecated sysfs attribute");
1136         printk(TPACPI_WARN "WARNING: sysfs attribute %s is deprecated and "
1137                 "will be removed. %s\n",
1138                 what, details);
1139 }
1140
1141 static void printk_deprecated_rfkill_attribute(const char * const what)
1142 {
1143         printk_deprecated_attribute(what,
1144                         "Please switch to generic rfkill before year 2010");
1145 }
1146
1147 /*************************************************************************
1148  * thinkpad-acpi driver attributes
1149  */
1150
1151 /* interface_version --------------------------------------------------- */
1152 static ssize_t tpacpi_driver_interface_version_show(
1153                                 struct device_driver *drv,
1154                                 char *buf)
1155 {
1156         return snprintf(buf, PAGE_SIZE, "0x%08x\n", TPACPI_SYSFS_VERSION);
1157 }
1158
1159 static DRIVER_ATTR(interface_version, S_IRUGO,
1160                 tpacpi_driver_interface_version_show, NULL);
1161
1162 /* debug_level --------------------------------------------------------- */
1163 static ssize_t tpacpi_driver_debug_show(struct device_driver *drv,
1164                                                 char *buf)
1165 {
1166         return snprintf(buf, PAGE_SIZE, "0x%04x\n", dbg_level);
1167 }
1168
1169 static ssize_t tpacpi_driver_debug_store(struct device_driver *drv,
1170                                                 const char *buf, size_t count)
1171 {
1172         unsigned long t;
1173
1174         if (parse_strtoul(buf, 0xffff, &t))
1175                 return -EINVAL;
1176
1177         dbg_level = t;
1178
1179         return count;
1180 }
1181
1182 static DRIVER_ATTR(debug_level, S_IWUSR | S_IRUGO,
1183                 tpacpi_driver_debug_show, tpacpi_driver_debug_store);
1184
1185 /* version ------------------------------------------------------------- */
1186 static ssize_t tpacpi_driver_version_show(struct device_driver *drv,
1187                                                 char *buf)
1188 {
1189         return snprintf(buf, PAGE_SIZE, "%s v%s\n",
1190                         TPACPI_DESC, TPACPI_VERSION);
1191 }
1192
1193 static DRIVER_ATTR(version, S_IRUGO,
1194                 tpacpi_driver_version_show, NULL);
1195
1196 /* --------------------------------------------------------------------- */
1197
1198 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
1199
1200 static void tpacpi_send_radiosw_update(void);
1201
1202 /* wlsw_emulstate ------------------------------------------------------ */
1203 static ssize_t tpacpi_driver_wlsw_emulstate_show(struct device_driver *drv,
1204                                                 char *buf)
1205 {
1206         return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_wlsw_emulstate);
1207 }
1208
1209 static ssize_t tpacpi_driver_wlsw_emulstate_store(struct device_driver *drv,
1210                                                 const char *buf, size_t count)
1211 {
1212         unsigned long t;
1213
1214         if (parse_strtoul(buf, 1, &t))
1215                 return -EINVAL;
1216
1217         if (tpacpi_wlsw_emulstate != t) {
1218                 tpacpi_wlsw_emulstate = !!t;
1219                 tpacpi_send_radiosw_update();
1220         } else
1221                 tpacpi_wlsw_emulstate = !!t;
1222
1223         return count;
1224 }
1225
1226 static DRIVER_ATTR(wlsw_emulstate, S_IWUSR | S_IRUGO,
1227                 tpacpi_driver_wlsw_emulstate_show,
1228                 tpacpi_driver_wlsw_emulstate_store);
1229
1230 /* bluetooth_emulstate ------------------------------------------------- */
1231 static ssize_t tpacpi_driver_bluetooth_emulstate_show(
1232                                         struct device_driver *drv,
1233                                         char *buf)
1234 {
1235         return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_bluetooth_emulstate);
1236 }
1237
1238 static ssize_t tpacpi_driver_bluetooth_emulstate_store(
1239                                         struct device_driver *drv,
1240                                         const char *buf, size_t count)
1241 {
1242         unsigned long t;
1243
1244         if (parse_strtoul(buf, 1, &t))
1245                 return -EINVAL;
1246
1247         tpacpi_bluetooth_emulstate = !!t;
1248
1249         return count;
1250 }
1251
1252 static DRIVER_ATTR(bluetooth_emulstate, S_IWUSR | S_IRUGO,
1253                 tpacpi_driver_bluetooth_emulstate_show,
1254                 tpacpi_driver_bluetooth_emulstate_store);
1255
1256 /* wwan_emulstate ------------------------------------------------- */
1257 static ssize_t tpacpi_driver_wwan_emulstate_show(
1258                                         struct device_driver *drv,
1259                                         char *buf)
1260 {
1261         return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_wwan_emulstate);
1262 }
1263
1264 static ssize_t tpacpi_driver_wwan_emulstate_store(
1265                                         struct device_driver *drv,
1266                                         const char *buf, size_t count)
1267 {
1268         unsigned long t;
1269
1270         if (parse_strtoul(buf, 1, &t))
1271                 return -EINVAL;
1272
1273         tpacpi_wwan_emulstate = !!t;
1274
1275         return count;
1276 }
1277
1278 static DRIVER_ATTR(wwan_emulstate, S_IWUSR | S_IRUGO,
1279                 tpacpi_driver_wwan_emulstate_show,
1280                 tpacpi_driver_wwan_emulstate_store);
1281
1282 /* uwb_emulstate ------------------------------------------------- */
1283 static ssize_t tpacpi_driver_uwb_emulstate_show(
1284                                         struct device_driver *drv,
1285                                         char *buf)
1286 {
1287         return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_uwb_emulstate);
1288 }
1289
1290 static ssize_t tpacpi_driver_uwb_emulstate_store(
1291                                         struct device_driver *drv,
1292                                         const char *buf, size_t count)
1293 {
1294         unsigned long t;
1295
1296         if (parse_strtoul(buf, 1, &t))
1297                 return -EINVAL;
1298
1299         tpacpi_uwb_emulstate = !!t;
1300
1301         return count;
1302 }
1303
1304 static DRIVER_ATTR(uwb_emulstate, S_IWUSR | S_IRUGO,
1305                 tpacpi_driver_uwb_emulstate_show,
1306                 tpacpi_driver_uwb_emulstate_store);
1307 #endif
1308
1309 /* --------------------------------------------------------------------- */
1310
1311 static struct driver_attribute *tpacpi_driver_attributes[] = {
1312         &driver_attr_debug_level, &driver_attr_version,
1313         &driver_attr_interface_version,
1314 };
1315
1316 static int __init tpacpi_create_driver_attributes(struct device_driver *drv)
1317 {
1318         int i, res;
1319
1320         i = 0;
1321         res = 0;
1322         while (!res && i < ARRAY_SIZE(tpacpi_driver_attributes)) {
1323                 res = driver_create_file(drv, tpacpi_driver_attributes[i]);
1324                 i++;
1325         }
1326
1327 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
1328         if (!res && dbg_wlswemul)
1329                 res = driver_create_file(drv, &driver_attr_wlsw_emulstate);
1330         if (!res && dbg_bluetoothemul)
1331                 res = driver_create_file(drv, &driver_attr_bluetooth_emulstate);
1332         if (!res && dbg_wwanemul)
1333                 res = driver_create_file(drv, &driver_attr_wwan_emulstate);
1334         if (!res && dbg_uwbemul)
1335                 res = driver_create_file(drv, &driver_attr_uwb_emulstate);
1336 #endif
1337
1338         return res;
1339 }
1340
1341 static void tpacpi_remove_driver_attributes(struct device_driver *drv)
1342 {
1343         int i;
1344
1345         for (i = 0; i < ARRAY_SIZE(tpacpi_driver_attributes); i++)
1346                 driver_remove_file(drv, tpacpi_driver_attributes[i]);
1347
1348 #ifdef THINKPAD_ACPI_DEBUGFACILITIES
1349         driver_remove_file(drv, &driver_attr_wlsw_emulstate);
1350         driver_remove_file(drv, &driver_attr_bluetooth_emulstate);
1351         driver_remove_file(drv, &driver_attr_wwan_emulstate);
1352         driver_remove_file(drv, &driver_attr_uwb_emulstate);
1353 #endif
1354 }
1355
1356 /****************************************************************************
1357  ****************************************************************************
1358  *
1359  * Subdrivers
1360  *
1361  ****************************************************************************
1362  ****************************************************************************/
1363
1364 /*************************************************************************
1365  * thinkpad-acpi init subdriver
1366  */
1367
1368 static int __init thinkpad_acpi_driver_init(struct ibm_init_struct *iibm)
1369 {
1370         printk(TPACPI_INFO "%s v%s\n", TPACPI_DESC, TPACPI_VERSION);
1371         printk(TPACPI_INFO "%s\n", TPACPI_URL);
1372
1373         printk(TPACPI_INFO "ThinkPad BIOS %s, EC %s\n",
1374                 (thinkpad_id.bios_version_str) ?
1375                         thinkpad_id.bios_version_str : "unknown",
1376                 (thinkpad_id.ec_version_str) ?
1377                         thinkpad_id.ec_version_str : "unknown");
1378
1379         if (thinkpad_id.vendor && thinkpad_id.model_str)
1380                 printk(TPACPI_INFO "%s %s, model %s\n",
1381                         (thinkpad_id.vendor == PCI_VENDOR_ID_IBM) ?
1382                                 "IBM" : ((thinkpad_id.vendor ==
1383                                                 PCI_VENDOR_ID_LENOVO) ?
1384                                         "Lenovo" : "Unknown vendor"),
1385                         thinkpad_id.model_str,
1386                         (thinkpad_id.nummodel_str) ?
1387                                 thinkpad_id.nummodel_str : "unknown");
1388
1389         return 0;
1390 }
1391
1392 static int thinkpad_acpi_driver_read(char *p)
1393 {
1394         int len = 0;
1395
1396         len += sprintf(p + len, "driver:\t\t%s\n", TPACPI_DESC);
1397         len += sprintf(p + len, "version:\t%s\n", TPACPI_VERSION);
1398
1399         return len;
1400 }
1401
1402 static struct ibm_struct thinkpad_acpi_driver_data = {
1403         .name = "driver",
1404         .read = thinkpad_acpi_driver_read,
1405 };
1406
1407 /*************************************************************************
1408  * Hotkey subdriver
1409  */
1410
1411 enum {  /* hot key scan codes (derived from ACPI DSDT) */
1412         TP_ACPI_HOTKEYSCAN_FNF1         = 0,
1413         TP_ACPI_HOTKEYSCAN_FNF2,
1414         TP_ACPI_HOTKEYSCAN_FNF3,
1415         TP_ACPI_HOTKEYSCAN_FNF4,
1416         TP_ACPI_HOTKEYSCAN_FNF5,
1417         TP_ACPI_HOTKEYSCAN_FNF6,
1418         TP_ACPI_HOTKEYSCAN_FNF7,
1419         TP_ACPI_HOTKEYSCAN_FNF8,
1420         TP_ACPI_HOTKEYSCAN_FNF9,
1421         TP_ACPI_HOTKEYSCAN_FNF10,
1422         TP_ACPI_HOTKEYSCAN_FNF11,
1423         TP_ACPI_HOTKEYSCAN_FNF12,
1424         TP_ACPI_HOTKEYSCAN_FNBACKSPACE,
1425         TP_ACPI_HOTKEYSCAN_FNINSERT,
1426         TP_ACPI_HOTKEYSCAN_FNDELETE,
1427         TP_ACPI_HOTKEYSCAN_FNHOME,
1428         TP_ACPI_HOTKEYSCAN_FNEND,
1429         TP_ACPI_HOTKEYSCAN_FNPAGEUP,
1430         TP_ACPI_HOTKEYSCAN_FNPAGEDOWN,
1431         TP_ACPI_HOTKEYSCAN_FNSPACE,
1432         TP_ACPI_HOTKEYSCAN_VOLUMEUP,
1433         TP_ACPI_HOTKEYSCAN_VOLUMEDOWN,
1434         TP_ACPI_HOTKEYSCAN_MUTE,
1435         TP_ACPI_HOTKEYSCAN_THINKPAD,
1436 };
1437
1438 enum {  /* Keys available through NVRAM polling */
1439         TPACPI_HKEY_NVRAM_KNOWN_MASK = 0x00fb88c0U,
1440         TPACPI_HKEY_NVRAM_GOOD_MASK  = 0x00fb8000U,
1441 };
1442
1443 enum {  /* Positions of some of the keys in hotkey masks */
1444         TP_ACPI_HKEY_DISPSWTCH_MASK     = 1 << TP_ACPI_HOTKEYSCAN_FNF7,
1445         TP_ACPI_HKEY_DISPXPAND_MASK     = 1 << TP_ACPI_HOTKEYSCAN_FNF8,
1446         TP_ACPI_HKEY_HIBERNATE_MASK     = 1 << TP_ACPI_HOTKEYSCAN_FNF12,
1447         TP_ACPI_HKEY_BRGHTUP_MASK       = 1 << TP_ACPI_HOTKEYSCAN_FNHOME,
1448         TP_ACPI_HKEY_BRGHTDWN_MASK      = 1 << TP_ACPI_HOTKEYSCAN_FNEND,
1449         TP_ACPI_HKEY_THNKLGHT_MASK      = 1 << TP_ACPI_HOTKEYSCAN_FNPAGEUP,
1450         TP_ACPI_HKEY_ZOOM_MASK          = 1 << TP_ACPI_HOTKEYSCAN_FNSPACE,
1451         TP_ACPI_HKEY_VOLUP_MASK         = 1 << TP_ACPI_HOTKEYSCAN_VOLUMEUP,
1452         TP_ACPI_HKEY_VOLDWN_MASK        = 1 << TP_ACPI_HOTKEYSCAN_VOLUMEDOWN,
1453         TP_ACPI_HKEY_MUTE_MASK          = 1 << TP_ACPI_HOTKEYSCAN_MUTE,
1454         TP_ACPI_HKEY_THINKPAD_MASK      = 1 << TP_ACPI_HOTKEYSCAN_THINKPAD,
1455 };
1456
1457 enum {  /* NVRAM to ACPI HKEY group map */
1458         TP_NVRAM_HKEY_GROUP_HK2         = TP_ACPI_HKEY_THINKPAD_MASK |
1459                                           TP_ACPI_HKEY_ZOOM_MASK |
1460                                           TP_ACPI_HKEY_DISPSWTCH_MASK |
1461                                           TP_ACPI_HKEY_HIBERNATE_MASK,
1462         TP_NVRAM_HKEY_GROUP_BRIGHTNESS  = TP_ACPI_HKEY_BRGHTUP_MASK |
1463                                           TP_ACPI_HKEY_BRGHTDWN_MASK,
1464         TP_NVRAM_HKEY_GROUP_VOLUME      = TP_ACPI_HKEY_VOLUP_MASK |
1465                                           TP_ACPI_HKEY_VOLDWN_MASK |
1466                                           TP_ACPI_HKEY_MUTE_MASK,
1467 };
1468
1469 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
1470 struct tp_nvram_state {
1471        u16 thinkpad_toggle:1;
1472        u16 zoom_toggle:1;
1473        u16 display_toggle:1;
1474        u16 thinklight_toggle:1;
1475        u16 hibernate_toggle:1;
1476        u16 displayexp_toggle:1;
1477        u16 display_state:1;
1478        u16 brightness_toggle:1;
1479        u16 volume_toggle:1;
1480        u16 mute:1;
1481
1482        u8 brightness_level;
1483        u8 volume_level;
1484 };
1485
1486 static struct task_struct *tpacpi_hotkey_task;
1487 static u32 hotkey_source_mask;          /* bit mask 0=ACPI,1=NVRAM */
1488 static int hotkey_poll_freq = 10;       /* Hz */
1489 static struct mutex hotkey_thread_mutex;
1490 static struct mutex hotkey_thread_data_mutex;
1491 static unsigned int hotkey_config_change;
1492
1493 #else /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
1494
1495 #define hotkey_source_mask 0U
1496
1497 #endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
1498
1499 static struct mutex hotkey_mutex;
1500
1501 static enum {   /* Reasons for waking up */
1502         TP_ACPI_WAKEUP_NONE = 0,        /* None or unknown */
1503         TP_ACPI_WAKEUP_BAYEJ,           /* Bay ejection request */
1504         TP_ACPI_WAKEUP_UNDOCK,          /* Undock request */
1505 } hotkey_wakeup_reason;
1506
1507 static int hotkey_autosleep_ack;
1508
1509 static u32 hotkey_orig_mask;
1510 static u32 hotkey_all_mask;
1511 static u32 hotkey_reserved_mask;
1512 static u32 hotkey_mask;
1513
1514 static unsigned int hotkey_report_mode;
1515
1516 static u16 *hotkey_keycode_map;
1517
1518 static struct attribute_set *hotkey_dev_attributes;
1519
1520 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
1521 #define HOTKEY_CONFIG_CRITICAL_START \
1522         do { \
1523                 mutex_lock(&hotkey_thread_data_mutex); \
1524                 hotkey_config_change++; \
1525         } while (0);
1526 #define HOTKEY_CONFIG_CRITICAL_END \
1527         mutex_unlock(&hotkey_thread_data_mutex);
1528 #else
1529 #define HOTKEY_CONFIG_CRITICAL_START
1530 #define HOTKEY_CONFIG_CRITICAL_END
1531 #endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
1532
1533 /* HKEY.MHKG() return bits */
1534 #define TP_HOTKEY_TABLET_MASK (1 << 3)
1535
1536 static int hotkey_get_wlsw(int *status)
1537 {
1538 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
1539         if (dbg_wlswemul) {
1540                 *status = !!tpacpi_wlsw_emulstate;
1541                 return 0;
1542         }
1543 #endif
1544         if (!acpi_evalf(hkey_handle, status, "WLSW", "d"))
1545                 return -EIO;
1546         return 0;
1547 }
1548
1549 static int hotkey_get_tablet_mode(int *status)
1550 {
1551         int s;
1552
1553         if (!acpi_evalf(hkey_handle, &s, "MHKG", "d"))
1554                 return -EIO;
1555
1556         *status = ((s & TP_HOTKEY_TABLET_MASK) != 0);
1557         return 0;
1558 }
1559
1560 /*
1561  * Call with hotkey_mutex held
1562  */
1563 static int hotkey_mask_get(void)
1564 {
1565         u32 m = 0;
1566
1567         if (tp_features.hotkey_mask) {
1568                 if (!acpi_evalf(hkey_handle, &m, "DHKN", "d"))
1569                         return -EIO;
1570         }
1571         hotkey_mask = m | (hotkey_source_mask & hotkey_mask);
1572
1573         return 0;
1574 }
1575
1576 /*
1577  * Call with hotkey_mutex held
1578  */
1579 static int hotkey_mask_set(u32 mask)
1580 {
1581         int i;
1582         int rc = 0;
1583
1584         if (tp_features.hotkey_mask) {
1585                 if (!tp_warned.hotkey_mask_ff &&
1586                     (mask == 0xffff || mask == 0xffffff ||
1587                      mask == 0xffffffff)) {
1588                         tp_warned.hotkey_mask_ff = 1;
1589                         printk(TPACPI_NOTICE
1590                                "setting the hotkey mask to 0x%08x is likely "
1591                                "not the best way to go about it\n", mask);
1592                         printk(TPACPI_NOTICE
1593                                "please consider using the driver defaults, "
1594                                "and refer to up-to-date thinkpad-acpi "
1595                                "documentation\n");
1596                 }
1597
1598                 HOTKEY_CONFIG_CRITICAL_START
1599                 for (i = 0; i < 32; i++) {
1600                         u32 m = 1 << i;
1601                         /* enable in firmware mask only keys not in NVRAM
1602                          * mode, but enable the key in the cached hotkey_mask
1603                          * regardless of mode, or the key will end up
1604                          * disabled by hotkey_mask_get() */
1605                         if (!acpi_evalf(hkey_handle,
1606                                         NULL, "MHKM", "vdd", i + 1,
1607                                         !!((mask & ~hotkey_source_mask) & m))) {
1608                                 rc = -EIO;
1609                                 break;
1610                         } else {
1611                                 hotkey_mask = (hotkey_mask & ~m) | (mask & m);
1612                         }
1613                 }
1614                 HOTKEY_CONFIG_CRITICAL_END
1615
1616                 /* hotkey_mask_get must be called unconditionally below */
1617                 if (!hotkey_mask_get() && !rc &&
1618                     (hotkey_mask & ~hotkey_source_mask) !=
1619                      (mask & ~hotkey_source_mask)) {
1620                         printk(TPACPI_NOTICE
1621                                "requested hot key mask 0x%08x, but "
1622                                "firmware forced it to 0x%08x\n",
1623                                mask, hotkey_mask);
1624                 }
1625         } else {
1626 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
1627                 HOTKEY_CONFIG_CRITICAL_START
1628                 hotkey_mask = mask & hotkey_source_mask;
1629                 HOTKEY_CONFIG_CRITICAL_END
1630                 hotkey_mask_get();
1631                 if (hotkey_mask != mask) {
1632                         printk(TPACPI_NOTICE
1633                                "requested hot key mask 0x%08x, "
1634                                "forced to 0x%08x (NVRAM poll mask is "
1635                                "0x%08x): no firmware mask support\n",
1636                                mask, hotkey_mask, hotkey_source_mask);
1637                 }
1638 #else
1639                 hotkey_mask_get();
1640                 rc = -ENXIO;
1641 #endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
1642         }
1643
1644         return rc;
1645 }
1646
1647 static int hotkey_status_get(int *status)
1648 {
1649         if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
1650                 return -EIO;
1651
1652         return 0;
1653 }
1654
1655 static int hotkey_status_set(bool enable)
1656 {
1657         if (!acpi_evalf(hkey_handle, NULL, "MHKC", "vd", enable ? 1 : 0))
1658                 return -EIO;
1659
1660         return 0;
1661 }
1662
1663 static void tpacpi_input_send_tabletsw(void)
1664 {
1665         int state;
1666
1667         if (tp_features.hotkey_tablet &&
1668             !hotkey_get_tablet_mode(&state)) {
1669                 mutex_lock(&tpacpi_inputdev_send_mutex);
1670
1671                 input_report_switch(tpacpi_inputdev,
1672                                     SW_TABLET_MODE, !!state);
1673                 input_sync(tpacpi_inputdev);
1674
1675                 mutex_unlock(&tpacpi_inputdev_send_mutex);
1676         }
1677 }
1678
1679 static void tpacpi_input_send_key(unsigned int scancode)
1680 {
1681         unsigned int keycode;
1682
1683         keycode = hotkey_keycode_map[scancode];
1684
1685         if (keycode != KEY_RESERVED) {
1686                 mutex_lock(&tpacpi_inputdev_send_mutex);
1687
1688                 input_report_key(tpacpi_inputdev, keycode, 1);
1689                 if (keycode == KEY_UNKNOWN)
1690                         input_event(tpacpi_inputdev, EV_MSC, MSC_SCAN,
1691                                     scancode);
1692                 input_sync(tpacpi_inputdev);
1693
1694                 input_report_key(tpacpi_inputdev, keycode, 0);
1695                 if (keycode == KEY_UNKNOWN)
1696                         input_event(tpacpi_inputdev, EV_MSC, MSC_SCAN,
1697                                     scancode);
1698                 input_sync(tpacpi_inputdev);
1699
1700                 mutex_unlock(&tpacpi_inputdev_send_mutex);
1701         }
1702 }
1703
1704 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
1705 static struct tp_acpi_drv_struct ibm_hotkey_acpidriver;
1706
1707 static void tpacpi_hotkey_send_key(unsigned int scancode)
1708 {
1709         tpacpi_input_send_key(scancode);
1710         if (hotkey_report_mode < 2) {
1711                 acpi_bus_generate_proc_event(ibm_hotkey_acpidriver.device,
1712                                                 0x80, 0x1001 + scancode);
1713         }
1714 }
1715
1716 static void hotkey_read_nvram(struct tp_nvram_state *n, u32 m)
1717 {
1718         u8 d;
1719
1720         if (m & TP_NVRAM_HKEY_GROUP_HK2) {
1721                 d = nvram_read_byte(TP_NVRAM_ADDR_HK2);
1722                 n->thinkpad_toggle = !!(d & TP_NVRAM_MASK_HKT_THINKPAD);
1723                 n->zoom_toggle = !!(d & TP_NVRAM_MASK_HKT_ZOOM);
1724                 n->display_toggle = !!(d & TP_NVRAM_MASK_HKT_DISPLAY);
1725                 n->hibernate_toggle = !!(d & TP_NVRAM_MASK_HKT_HIBERNATE);
1726         }
1727         if (m & TP_ACPI_HKEY_THNKLGHT_MASK) {
1728                 d = nvram_read_byte(TP_NVRAM_ADDR_THINKLIGHT);
1729                 n->thinklight_toggle = !!(d & TP_NVRAM_MASK_THINKLIGHT);
1730         }
1731         if (m & TP_ACPI_HKEY_DISPXPAND_MASK) {
1732                 d = nvram_read_byte(TP_NVRAM_ADDR_VIDEO);
1733                 n->displayexp_toggle =
1734                                 !!(d & TP_NVRAM_MASK_HKT_DISPEXPND);
1735         }
1736         if (m & TP_NVRAM_HKEY_GROUP_BRIGHTNESS) {
1737                 d = nvram_read_byte(TP_NVRAM_ADDR_BRIGHTNESS);
1738                 n->brightness_level = (d & TP_NVRAM_MASK_LEVEL_BRIGHTNESS)
1739                                 >> TP_NVRAM_POS_LEVEL_BRIGHTNESS;
1740                 n->brightness_toggle =
1741                                 !!(d & TP_NVRAM_MASK_HKT_BRIGHTNESS);
1742         }
1743         if (m & TP_NVRAM_HKEY_GROUP_VOLUME) {
1744                 d = nvram_read_byte(TP_NVRAM_ADDR_MIXER);
1745                 n->volume_level = (d & TP_NVRAM_MASK_LEVEL_VOLUME)
1746                                 >> TP_NVRAM_POS_LEVEL_VOLUME;
1747                 n->mute = !!(d & TP_NVRAM_MASK_MUTE);
1748                 n->volume_toggle = !!(d & TP_NVRAM_MASK_HKT_VOLUME);
1749         }
1750 }
1751
1752 #define TPACPI_COMPARE_KEY(__scancode, __member) \
1753         do { \
1754                 if ((mask & (1 << __scancode)) && \
1755                     oldn->__member != newn->__member) \
1756                 tpacpi_hotkey_send_key(__scancode); \
1757         } while (0)
1758
1759 #define TPACPI_MAY_SEND_KEY(__scancode) \
1760         do { if (mask & (1 << __scancode)) \
1761                 tpacpi_hotkey_send_key(__scancode); } while (0)
1762
1763 static void hotkey_compare_and_issue_event(struct tp_nvram_state *oldn,
1764                                            struct tp_nvram_state *newn,
1765                                            u32 mask)
1766 {
1767         TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_THINKPAD, thinkpad_toggle);
1768         TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNSPACE, zoom_toggle);
1769         TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNF7, display_toggle);
1770         TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNF12, hibernate_toggle);
1771
1772         TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNPAGEUP, thinklight_toggle);
1773
1774         TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNF8, displayexp_toggle);
1775
1776         /* handle volume */
1777         if (oldn->volume_toggle != newn->volume_toggle) {
1778                 if (oldn->mute != newn->mute) {
1779                         TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_MUTE);
1780                 }
1781                 if (oldn->volume_level > newn->volume_level) {
1782                         TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEDOWN);
1783                 } else if (oldn->volume_level < newn->volume_level) {
1784                         TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEUP);
1785                 } else if (oldn->mute == newn->mute) {
1786                         /* repeated key presses that didn't change state */
1787                         if (newn->mute) {
1788                                 TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_MUTE);
1789                         } else if (newn->volume_level != 0) {
1790                                 TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEUP);
1791                         } else {
1792                                 TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEDOWN);
1793                         }
1794                 }
1795         }
1796
1797         /* handle brightness */
1798         if (oldn->brightness_toggle != newn->brightness_toggle) {
1799                 if (oldn->brightness_level < newn->brightness_level) {
1800                         TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNHOME);
1801                 } else if (oldn->brightness_level > newn->brightness_level) {
1802                         TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNEND);
1803                 } else {
1804                         /* repeated key presses that didn't change state */
1805                         if (newn->brightness_level != 0) {
1806                                 TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNHOME);
1807                         } else {
1808                                 TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNEND);
1809                         }
1810                 }
1811         }
1812 }
1813
1814 #undef TPACPI_COMPARE_KEY
1815 #undef TPACPI_MAY_SEND_KEY
1816
1817 static int hotkey_kthread(void *data)
1818 {
1819         struct tp_nvram_state s[2];
1820         u32 mask;
1821         unsigned int si, so;
1822         unsigned long t;
1823         unsigned int change_detector, must_reset;
1824
1825         mutex_lock(&hotkey_thread_mutex);
1826
1827         if (tpacpi_lifecycle == TPACPI_LIFE_EXITING)
1828                 goto exit;
1829
1830         set_freezable();
1831
1832         so = 0;
1833         si = 1;
1834         t = 0;
1835
1836         /* Initial state for compares */
1837         mutex_lock(&hotkey_thread_data_mutex);
1838         change_detector = hotkey_config_change;
1839         mask = hotkey_source_mask & hotkey_mask;
1840         mutex_unlock(&hotkey_thread_data_mutex);
1841         hotkey_read_nvram(&s[so], mask);
1842
1843         while (!kthread_should_stop() && hotkey_poll_freq) {
1844                 if (t == 0)
1845                         t = 1000/hotkey_poll_freq;
1846                 t = msleep_interruptible(t);
1847                 if (unlikely(kthread_should_stop()))
1848                         break;
1849                 must_reset = try_to_freeze();
1850                 if (t > 0 && !must_reset)
1851                         continue;
1852
1853                 mutex_lock(&hotkey_thread_data_mutex);
1854                 if (must_reset || hotkey_config_change != change_detector) {
1855                         /* forget old state on thaw or config change */
1856                         si = so;
1857                         t = 0;
1858                         change_detector = hotkey_config_change;
1859                 }
1860                 mask = hotkey_source_mask & hotkey_mask;
1861                 mutex_unlock(&hotkey_thread_data_mutex);
1862
1863                 if (likely(mask)) {
1864                         hotkey_read_nvram(&s[si], mask);
1865                         if (likely(si != so)) {
1866                                 hotkey_compare_and_issue_event(&s[so], &s[si],
1867                                                                 mask);
1868                         }
1869                 }
1870
1871                 so = si;
1872                 si ^= 1;
1873         }
1874
1875 exit:
1876         mutex_unlock(&hotkey_thread_mutex);
1877         return 0;
1878 }
1879
1880 static void hotkey_poll_stop_sync(void)
1881 {
1882         if (tpacpi_hotkey_task) {
1883                 if (frozen(tpacpi_hotkey_task) ||
1884                     freezing(tpacpi_hotkey_task))
1885                         thaw_process(tpacpi_hotkey_task);
1886
1887                 kthread_stop(tpacpi_hotkey_task);
1888                 tpacpi_hotkey_task = NULL;
1889                 mutex_lock(&hotkey_thread_mutex);
1890                 /* at this point, the thread did exit */
1891                 mutex_unlock(&hotkey_thread_mutex);
1892         }
1893 }
1894
1895 /* call with hotkey_mutex held */
1896 static void hotkey_poll_setup(int may_warn)
1897 {
1898         if ((hotkey_source_mask & hotkey_mask) != 0 &&
1899             hotkey_poll_freq > 0 &&
1900             (tpacpi_inputdev->users > 0 || hotkey_report_mode < 2)) {
1901                 if (!tpacpi_hotkey_task) {
1902                         tpacpi_hotkey_task = kthread_run(hotkey_kthread,
1903                                         NULL, TPACPI_NVRAM_KTHREAD_NAME);
1904                         if (IS_ERR(tpacpi_hotkey_task)) {
1905                                 tpacpi_hotkey_task = NULL;
1906                                 printk(TPACPI_ERR
1907                                        "could not create kernel thread "
1908                                        "for hotkey polling\n");
1909                         }
1910                 }
1911         } else {
1912                 hotkey_poll_stop_sync();
1913                 if (may_warn &&
1914                     hotkey_source_mask != 0 && hotkey_poll_freq == 0) {
1915                         printk(TPACPI_NOTICE
1916                                 "hot keys 0x%08x require polling, "
1917                                 "which is currently disabled\n",
1918                                 hotkey_source_mask);
1919                 }
1920         }
1921 }
1922
1923 static void hotkey_poll_setup_safe(int may_warn)
1924 {
1925         mutex_lock(&hotkey_mutex);
1926         hotkey_poll_setup(may_warn);
1927         mutex_unlock(&hotkey_mutex);
1928 }
1929
1930 #else /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
1931
1932 static void hotkey_poll_setup_safe(int __unused)
1933 {
1934 }
1935
1936 #endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
1937
1938 static int hotkey_inputdev_open(struct input_dev *dev)
1939 {
1940         switch (tpacpi_lifecycle) {
1941         case TPACPI_LIFE_INIT:
1942                 /*
1943                  * hotkey_init will call hotkey_poll_setup_safe
1944                  * at the appropriate moment
1945                  */
1946                 return 0;
1947         case TPACPI_LIFE_EXITING:
1948                 return -EBUSY;
1949         case TPACPI_LIFE_RUNNING:
1950                 hotkey_poll_setup_safe(0);
1951                 return 0;
1952         }
1953
1954         /* Should only happen if tpacpi_lifecycle is corrupt */
1955         BUG();
1956         return -EBUSY;
1957 }
1958
1959 static void hotkey_inputdev_close(struct input_dev *dev)
1960 {
1961         /* disable hotkey polling when possible */
1962         if (tpacpi_lifecycle == TPACPI_LIFE_RUNNING)
1963                 hotkey_poll_setup_safe(0);
1964 }
1965
1966 /* sysfs hotkey enable ------------------------------------------------- */
1967 static ssize_t hotkey_enable_show(struct device *dev,
1968                            struct device_attribute *attr,
1969                            char *buf)
1970 {
1971         int res, status;
1972
1973         printk_deprecated_attribute("hotkey_enable",
1974                         "Hotkey reporting is always enabled");
1975
1976         res = hotkey_status_get(&status);
1977         if (res)
1978                 return res;
1979
1980         return snprintf(buf, PAGE_SIZE, "%d\n", status);
1981 }
1982
1983 static ssize_t hotkey_enable_store(struct device *dev,
1984                             struct device_attribute *attr,
1985                             const char *buf, size_t count)
1986 {
1987         unsigned long t;
1988
1989         printk_deprecated_attribute("hotkey_enable",
1990                         "Hotkeys can be disabled through hotkey_mask");
1991
1992         if (parse_strtoul(buf, 1, &t))
1993                 return -EINVAL;
1994
1995         if (t == 0)
1996                 return -EPERM;
1997
1998         return count;
1999 }
2000
2001 static struct device_attribute dev_attr_hotkey_enable =
2002         __ATTR(hotkey_enable, S_IWUSR | S_IRUGO,
2003                 hotkey_enable_show, hotkey_enable_store);
2004
2005 /* sysfs hotkey mask --------------------------------------------------- */
2006 static ssize_t hotkey_mask_show(struct device *dev,
2007                            struct device_attribute *attr,
2008                            char *buf)
2009 {
2010         int res;
2011
2012         if (mutex_lock_killable(&hotkey_mutex))
2013                 return -ERESTARTSYS;
2014         res = hotkey_mask_get();
2015         mutex_unlock(&hotkey_mutex);
2016
2017         return (res)?
2018                 res : snprintf(buf, PAGE_SIZE, "0x%08x\n", hotkey_mask);
2019 }
2020
2021 static ssize_t hotkey_mask_store(struct device *dev,
2022                             struct device_attribute *attr,
2023                             const char *buf, size_t count)
2024 {
2025         unsigned long t;
2026         int res;
2027
2028         if (parse_strtoul(buf, 0xffffffffUL, &t))
2029                 return -EINVAL;
2030
2031         if (mutex_lock_killable(&hotkey_mutex))
2032                 return -ERESTARTSYS;
2033
2034         res = hotkey_mask_set(t);
2035
2036 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
2037         hotkey_poll_setup(1);
2038 #endif
2039
2040         mutex_unlock(&hotkey_mutex);
2041
2042         tpacpi_disclose_usertask("hotkey_mask", "set to 0x%08lx\n", t);
2043
2044         return (res) ? res : count;
2045 }
2046
2047 static struct device_attribute dev_attr_hotkey_mask =
2048         __ATTR(hotkey_mask, S_IWUSR | S_IRUGO,
2049                 hotkey_mask_show, hotkey_mask_store);
2050
2051 /* sysfs hotkey bios_enabled ------------------------------------------- */
2052 static ssize_t hotkey_bios_enabled_show(struct device *dev,
2053                            struct device_attribute *attr,
2054                            char *buf)
2055 {
2056         return sprintf(buf, "0\n");
2057 }
2058
2059 static struct device_attribute dev_attr_hotkey_bios_enabled =
2060         __ATTR(hotkey_bios_enabled, S_IRUGO, hotkey_bios_enabled_show, NULL);
2061
2062 /* sysfs hotkey bios_mask ---------------------------------------------- */
2063 static ssize_t hotkey_bios_mask_show(struct device *dev,
2064                            struct device_attribute *attr,
2065                            char *buf)
2066 {
2067         return snprintf(buf, PAGE_SIZE, "0x%08x\n", hotkey_orig_mask);
2068 }
2069
2070 static struct device_attribute dev_attr_hotkey_bios_mask =
2071         __ATTR(hotkey_bios_mask, S_IRUGO, hotkey_bios_mask_show, NULL);
2072
2073 /* sysfs hotkey all_mask ----------------------------------------------- */
2074 static ssize_t hotkey_all_mask_show(struct device *dev,
2075                            struct device_attribute *attr,
2076                            char *buf)
2077 {
2078         return snprintf(buf, PAGE_SIZE, "0x%08x\n",
2079                                 hotkey_all_mask | hotkey_source_mask);
2080 }
2081
2082 static struct device_attribute dev_attr_hotkey_all_mask =
2083         __ATTR(hotkey_all_mask, S_IRUGO, hotkey_all_mask_show, NULL);
2084
2085 /* sysfs hotkey recommended_mask --------------------------------------- */
2086 static ssize_t hotkey_recommended_mask_show(struct device *dev,
2087                                             struct device_attribute *attr,
2088                                             char *buf)
2089 {
2090         return snprintf(buf, PAGE_SIZE, "0x%08x\n",
2091                         (hotkey_all_mask | hotkey_source_mask)
2092                         & ~hotkey_reserved_mask);
2093 }
2094
2095 static struct device_attribute dev_attr_hotkey_recommended_mask =
2096         __ATTR(hotkey_recommended_mask, S_IRUGO,
2097                 hotkey_recommended_mask_show, NULL);
2098
2099 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
2100
2101 /* sysfs hotkey hotkey_source_mask ------------------------------------- */
2102 static ssize_t hotkey_source_mask_show(struct device *dev,
2103                            struct device_attribute *attr,
2104                            char *buf)
2105 {
2106         return snprintf(buf, PAGE_SIZE, "0x%08x\n", hotkey_source_mask);
2107 }
2108
2109 static ssize_t hotkey_source_mask_store(struct device *dev,
2110                             struct device_attribute *attr,
2111                             const char *buf, size_t count)
2112 {
2113         unsigned long t;
2114
2115         if (parse_strtoul(buf, 0xffffffffUL, &t) ||
2116                 ((t & ~TPACPI_HKEY_NVRAM_KNOWN_MASK) != 0))
2117                 return -EINVAL;
2118
2119         if (mutex_lock_killable(&hotkey_mutex))
2120                 return -ERESTARTSYS;
2121
2122         HOTKEY_CONFIG_CRITICAL_START
2123         hotkey_source_mask = t;
2124         HOTKEY_CONFIG_CRITICAL_END
2125
2126         hotkey_poll_setup(1);
2127
2128         mutex_unlock(&hotkey_mutex);
2129
2130         tpacpi_disclose_usertask("hotkey_source_mask", "set to 0x%08lx\n", t);
2131
2132         return count;
2133 }
2134
2135 static struct device_attribute dev_attr_hotkey_source_mask =
2136         __ATTR(hotkey_source_mask, S_IWUSR | S_IRUGO,
2137                 hotkey_source_mask_show, hotkey_source_mask_store);
2138
2139 /* sysfs hotkey hotkey_poll_freq --------------------------------------- */
2140 static ssize_t hotkey_poll_freq_show(struct device *dev,
2141                            struct device_attribute *attr,
2142                            char *buf)
2143 {
2144         return snprintf(buf, PAGE_SIZE, "%d\n", hotkey_poll_freq);
2145 }
2146
2147 static ssize_t hotkey_poll_freq_store(struct device *dev,
2148                             struct device_attribute *attr,
2149                             const char *buf, size_t count)
2150 {
2151         unsigned long t;
2152
2153         if (parse_strtoul(buf, 25, &t))
2154                 return -EINVAL;
2155
2156         if (mutex_lock_killable(&hotkey_mutex))
2157                 return -ERESTARTSYS;
2158
2159         hotkey_poll_freq = t;
2160
2161         hotkey_poll_setup(1);
2162         mutex_unlock(&hotkey_mutex);
2163
2164         tpacpi_disclose_usertask("hotkey_poll_freq", "set to %lu\n", t);
2165
2166         return count;
2167 }
2168
2169 static struct device_attribute dev_attr_hotkey_poll_freq =
2170         __ATTR(hotkey_poll_freq, S_IWUSR | S_IRUGO,
2171                 hotkey_poll_freq_show, hotkey_poll_freq_store);
2172
2173 #endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
2174
2175 /* sysfs hotkey radio_sw (pollable) ------------------------------------ */
2176 static ssize_t hotkey_radio_sw_show(struct device *dev,
2177                            struct device_attribute *attr,
2178                            char *buf)
2179 {
2180         int res, s;
2181         res = hotkey_get_wlsw(&s);
2182         if (res < 0)
2183                 return res;
2184
2185         return snprintf(buf, PAGE_SIZE, "%d\n", !!s);
2186 }
2187
2188 static struct device_attribute dev_attr_hotkey_radio_sw =
2189         __ATTR(hotkey_radio_sw, S_IRUGO, hotkey_radio_sw_show, NULL);
2190
2191 static void hotkey_radio_sw_notify_change(void)
2192 {
2193         if (tp_features.hotkey_wlsw)
2194                 sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
2195                              "hotkey_radio_sw");
2196 }
2197
2198 /* sysfs hotkey tablet mode (pollable) --------------------------------- */
2199 static ssize_t hotkey_tablet_mode_show(struct device *dev,
2200                            struct device_attribute *attr,
2201                            char *buf)
2202 {
2203         int res, s;
2204         res = hotkey_get_tablet_mode(&s);
2205         if (res < 0)
2206                 return res;
2207
2208         return snprintf(buf, PAGE_SIZE, "%d\n", !!s);
2209 }
2210
2211 static struct device_attribute dev_attr_hotkey_tablet_mode =
2212         __ATTR(hotkey_tablet_mode, S_IRUGO, hotkey_tablet_mode_show, NULL);
2213
2214 static void hotkey_tablet_mode_notify_change(void)
2215 {
2216         if (tp_features.hotkey_tablet)
2217                 sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
2218                              "hotkey_tablet_mode");
2219 }
2220
2221 /* sysfs hotkey report_mode -------------------------------------------- */
2222 static ssize_t hotkey_report_mode_show(struct device *dev,
2223                            struct device_attribute *attr,
2224                            char *buf)
2225 {
2226         return snprintf(buf, PAGE_SIZE, "%d\n",
2227                 (hotkey_report_mode != 0) ? hotkey_report_mode : 1);
2228 }
2229
2230 static struct device_attribute dev_attr_hotkey_report_mode =
2231         __ATTR(hotkey_report_mode, S_IRUGO, hotkey_report_mode_show, NULL);
2232
2233 /* sysfs wakeup reason (pollable) -------------------------------------- */
2234 static ssize_t hotkey_wakeup_reason_show(struct device *dev,
2235                            struct device_attribute *attr,
2236                            char *buf)
2237 {
2238         return snprintf(buf, PAGE_SIZE, "%d\n", hotkey_wakeup_reason);
2239 }
2240
2241 static struct device_attribute dev_attr_hotkey_wakeup_reason =
2242         __ATTR(wakeup_reason, S_IRUGO, hotkey_wakeup_reason_show, NULL);
2243
2244 static void hotkey_wakeup_reason_notify_change(void)
2245 {
2246         if (tp_features.hotkey_mask)
2247                 sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
2248                              "wakeup_reason");
2249 }
2250
2251 /* sysfs wakeup hotunplug_complete (pollable) -------------------------- */
2252 static ssize_t hotkey_wakeup_hotunplug_complete_show(struct device *dev,
2253                            struct device_attribute *attr,
2254                            char *buf)
2255 {
2256         return snprintf(buf, PAGE_SIZE, "%d\n", hotkey_autosleep_ack);
2257 }
2258
2259 static struct device_attribute dev_attr_hotkey_wakeup_hotunplug_complete =
2260         __ATTR(wakeup_hotunplug_complete, S_IRUGO,
2261                hotkey_wakeup_hotunplug_complete_show, NULL);
2262
2263 static void hotkey_wakeup_hotunplug_complete_notify_change(void)
2264 {
2265         if (tp_features.hotkey_mask)
2266                 sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
2267                              "wakeup_hotunplug_complete");
2268 }
2269
2270 /* --------------------------------------------------------------------- */
2271
2272 static struct attribute *hotkey_attributes[] __initdata = {
2273         &dev_attr_hotkey_enable.attr,
2274         &dev_attr_hotkey_bios_enabled.attr,
2275         &dev_attr_hotkey_report_mode.attr,
2276 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
2277         &dev_attr_hotkey_mask.attr,
2278         &dev_attr_hotkey_all_mask.attr,
2279         &dev_attr_hotkey_recommended_mask.attr,
2280         &dev_attr_hotkey_source_mask.attr,
2281         &dev_attr_hotkey_poll_freq.attr,
2282 #endif
2283 };
2284
2285 static struct attribute *hotkey_mask_attributes[] __initdata = {
2286         &dev_attr_hotkey_bios_mask.attr,
2287 #ifndef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
2288         &dev_attr_hotkey_mask.attr,
2289         &dev_attr_hotkey_all_mask.attr,
2290         &dev_attr_hotkey_recommended_mask.attr,
2291 #endif
2292         &dev_attr_hotkey_wakeup_reason.attr,
2293         &dev_attr_hotkey_wakeup_hotunplug_complete.attr,
2294 };
2295
2296 static void bluetooth_update_rfk(void);
2297 static void wan_update_rfk(void);
2298 static void uwb_update_rfk(void);
2299 static void tpacpi_send_radiosw_update(void)
2300 {
2301         int wlsw;
2302
2303         /* Sync these BEFORE sending any rfkill events */
2304         if (tp_features.bluetooth)
2305                 bluetooth_update_rfk();
2306         if (tp_features.wan)
2307                 wan_update_rfk();
2308         if (tp_features.uwb)
2309                 uwb_update_rfk();
2310
2311         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&wlsw)) {
2312                 mutex_lock(&tpacpi_inputdev_send_mutex);
2313
2314                 input_report_switch(tpacpi_inputdev,
2315                                     SW_RFKILL_ALL, !!wlsw);
2316                 input_sync(tpacpi_inputdev);
2317
2318                 mutex_unlock(&tpacpi_inputdev_send_mutex);
2319         }
2320         hotkey_radio_sw_notify_change();
2321 }
2322
2323 static void hotkey_exit(void)
2324 {
2325 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
2326         hotkey_poll_stop_sync();
2327 #endif
2328
2329         if (hotkey_dev_attributes)
2330                 delete_attr_set(hotkey_dev_attributes, &tpacpi_pdev->dev.kobj);
2331
2332         kfree(hotkey_keycode_map);
2333
2334         if (tp_features.hotkey) {
2335                 dbg_printk(TPACPI_DBG_EXIT | TPACPI_DBG_HKEY,
2336                            "restoring original hot key mask\n");
2337                 /* no short-circuit boolean operator below! */
2338                 if ((hotkey_mask_set(hotkey_orig_mask) |
2339                      hotkey_status_set(false)) != 0)
2340                         printk(TPACPI_ERR
2341                                "failed to restore hot key mask "
2342                                "to BIOS defaults\n");
2343         }
2344 }
2345
2346 static int __init hotkey_init(struct ibm_init_struct *iibm)
2347 {
2348         /* Requirements for changing the default keymaps:
2349          *
2350          * 1. Many of the keys are mapped to KEY_RESERVED for very
2351          *    good reasons.  Do not change them unless you have deep
2352          *    knowledge on the IBM and Lenovo ThinkPad firmware for
2353          *    the various ThinkPad models.  The driver behaves
2354          *    differently for KEY_RESERVED: such keys have their
2355          *    hot key mask *unset* in mask_recommended, and also
2356          *    in the initial hot key mask programmed into the
2357          *    firmware at driver load time, which means the firm-
2358          *    ware may react very differently if you change them to
2359          *    something else;
2360          *
2361          * 2. You must be subscribed to the linux-thinkpad and
2362          *    ibm-acpi-devel mailing lists, and you should read the
2363          *    list archives since 2007 if you want to change the
2364          *    keymaps.  This requirement exists so that you will
2365          *    know the past history of problems with the thinkpad-
2366          *    acpi driver keymaps, and also that you will be
2367          *    listening to any bug reports;
2368          *
2369          * 3. Do not send thinkpad-acpi specific patches directly to
2370          *    for merging, *ever*.  Send them to the linux-acpi
2371          *    mailinglist for comments.  Merging is to be done only
2372          *    through acpi-test and the ACPI maintainer.
2373          *
2374          * If the above is too much to ask, don't change the keymap.
2375          * Ask the thinkpad-acpi maintainer to do it, instead.
2376          */
2377         static u16 ibm_keycode_map[] __initdata = {
2378                 /* Scan Codes 0x00 to 0x0B: ACPI HKEY FN+F1..F12 */
2379                 KEY_FN_F1,      KEY_FN_F2,      KEY_COFFEE,     KEY_SLEEP,
2380                 KEY_WLAN,       KEY_FN_F6, KEY_SWITCHVIDEOMODE, KEY_FN_F8,
2381                 KEY_FN_F9,      KEY_FN_F10,     KEY_FN_F11,     KEY_SUSPEND,
2382
2383                 /* Scan codes 0x0C to 0x1F: Other ACPI HKEY hot keys */
2384                 KEY_UNKNOWN,    /* 0x0C: FN+BACKSPACE */
2385                 KEY_UNKNOWN,    /* 0x0D: FN+INSERT */
2386                 KEY_UNKNOWN,    /* 0x0E: FN+DELETE */
2387
2388                 /* brightness: firmware always reacts to them, unless
2389                  * X.org did some tricks in the radeon BIOS scratch
2390                  * registers of *some* models */
2391                 KEY_RESERVED,   /* 0x0F: FN+HOME (brightness up) */
2392                 KEY_RESERVED,   /* 0x10: FN+END (brightness down) */
2393
2394                 /* Thinklight: firmware always react to it */
2395                 KEY_RESERVED,   /* 0x11: FN+PGUP (thinklight toggle) */
2396
2397                 KEY_UNKNOWN,    /* 0x12: FN+PGDOWN */
2398                 KEY_ZOOM,       /* 0x13: FN+SPACE (zoom) */
2399
2400                 /* Volume: firmware always react to it and reprograms
2401                  * the built-in *extra* mixer.  Never map it to control
2402                  * another mixer by default. */
2403                 KEY_RESERVED,   /* 0x14: VOLUME UP */
2404                 KEY_RESERVED,   /* 0x15: VOLUME DOWN */
2405                 KEY_RESERVED,   /* 0x16: MUTE */
2406
2407                 KEY_VENDOR,     /* 0x17: Thinkpad/AccessIBM/Lenovo */
2408
2409                 /* (assignments unknown, please report if found) */
2410                 KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
2411                 KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
2412         };
2413         static u16 lenovo_keycode_map[] __initdata = {
2414                 /* Scan Codes 0x00 to 0x0B: ACPI HKEY FN+F1..F12 */
2415                 KEY_FN_F1,      KEY_COFFEE,     KEY_BATTERY,    KEY_SLEEP,
2416                 KEY_WLAN,       KEY_FN_F6, KEY_SWITCHVIDEOMODE, KEY_FN_F8,
2417                 KEY_FN_F9,      KEY_FN_F10,     KEY_FN_F11,     KEY_SUSPEND,
2418
2419                 /* Scan codes 0x0C to 0x1F: Other ACPI HKEY hot keys */
2420                 KEY_UNKNOWN,    /* 0x0C: FN+BACKSPACE */
2421                 KEY_UNKNOWN,    /* 0x0D: FN+INSERT */
2422                 KEY_UNKNOWN,    /* 0x0E: FN+DELETE */
2423
2424                 /* These either have to go through ACPI video, or
2425                  * act like in the IBM ThinkPads, so don't ever
2426                  * enable them by default */
2427                 KEY_RESERVED,   /* 0x0F: FN+HOME (brightness up) */
2428                 KEY_RESERVED,   /* 0x10: FN+END (brightness down) */
2429
2430                 KEY_RESERVED,   /* 0x11: FN+PGUP (thinklight toggle) */
2431
2432                 KEY_UNKNOWN,    /* 0x12: FN+PGDOWN */
2433                 KEY_ZOOM,       /* 0x13: FN+SPACE (zoom) */
2434
2435                 /* Volume: z60/z61, T60 (BIOS version?): firmware always
2436                  * react to it and reprograms the built-in *extra* mixer.
2437                  * Never map it to control another mixer by default.
2438                  *
2439                  * T60?, T61, R60?, R61: firmware and EC tries to send
2440                  * these over the regular keyboard, so these are no-ops,
2441                  * but there are still weird bugs re. MUTE, so do not
2442                  * change unless you get test reports from all Lenovo
2443                  * models.  May cause the BIOS to interfere with the
2444                  * HDA mixer.
2445                  */
2446                 KEY_RESERVED,   /* 0x14: VOLUME UP */
2447                 KEY_RESERVED,   /* 0x15: VOLUME DOWN */
2448                 KEY_RESERVED,   /* 0x16: MUTE */
2449
2450                 KEY_VENDOR,     /* 0x17: Thinkpad/AccessIBM/Lenovo */
2451
2452                 /* (assignments unknown, please report if found) */
2453                 KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
2454                 KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
2455         };
2456
2457 #define TPACPI_HOTKEY_MAP_LEN           ARRAY_SIZE(ibm_keycode_map)
2458 #define TPACPI_HOTKEY_MAP_SIZE          sizeof(ibm_keycode_map)
2459 #define TPACPI_HOTKEY_MAP_TYPESIZE      sizeof(ibm_keycode_map[0])
2460
2461         int res, i;
2462         int status;
2463         int hkeyv;
2464
2465         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2466                         "initializing hotkey subdriver\n");
2467
2468         BUG_ON(!tpacpi_inputdev);
2469         BUG_ON(tpacpi_inputdev->open != NULL ||
2470                tpacpi_inputdev->close != NULL);
2471
2472         TPACPI_ACPIHANDLE_INIT(hkey);
2473         mutex_init(&hotkey_mutex);
2474
2475 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
2476         mutex_init(&hotkey_thread_mutex);
2477         mutex_init(&hotkey_thread_data_mutex);
2478 #endif
2479
2480         /* hotkey not supported on 570 */
2481         tp_features.hotkey = hkey_handle != NULL;
2482
2483         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2484                 "hotkeys are %s\n",
2485                 str_supported(tp_features.hotkey));
2486
2487         if (!tp_features.hotkey)
2488                 return 1;
2489
2490         tpacpi_disable_brightness_delay();
2491
2492         hotkey_dev_attributes = create_attr_set(13, NULL);
2493         if (!hotkey_dev_attributes)
2494                 return -ENOMEM;
2495         res = add_many_to_attr_set(hotkey_dev_attributes,
2496                         hotkey_attributes,
2497                         ARRAY_SIZE(hotkey_attributes));
2498         if (res)
2499                 goto err_exit;
2500
2501         /* mask not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
2502            A30, R30, R31, T20-22, X20-21, X22-24.  Detected by checking
2503            for HKEY interface version 0x100 */
2504         if (acpi_evalf(hkey_handle, &hkeyv, "MHKV", "qd")) {
2505                 if ((hkeyv >> 8) != 1) {
2506                         printk(TPACPI_ERR "unknown version of the "
2507                                "HKEY interface: 0x%x\n", hkeyv);
2508                         printk(TPACPI_ERR "please report this to %s\n",
2509                                TPACPI_MAIL);
2510                 } else {
2511                         /*
2512                          * MHKV 0x100 in A31, R40, R40e,
2513                          * T4x, X31, and later
2514                          */
2515                         tp_features.hotkey_mask = 1;
2516                         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2517                                 "firmware HKEY interface version: 0x%x\n",
2518                                 hkeyv);
2519                 }
2520         }
2521
2522         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2523                 "hotkey masks are %s\n",
2524                 str_supported(tp_features.hotkey_mask));
2525
2526         if (tp_features.hotkey_mask) {
2527                 if (!acpi_evalf(hkey_handle, &hotkey_all_mask,
2528                                 "MHKA", "qd")) {
2529                         printk(TPACPI_ERR
2530                                "missing MHKA handler, "
2531                                "please report this to %s\n",
2532                                TPACPI_MAIL);
2533                         /* FN+F12, FN+F4, FN+F3 */
2534                         hotkey_all_mask = 0x080cU;
2535                 }
2536         }
2537
2538         /* hotkey_source_mask *must* be zero for
2539          * the first hotkey_mask_get */
2540         if (tp_features.hotkey_mask) {
2541                 res = hotkey_mask_get();
2542                 if (res)
2543                         goto err_exit;
2544
2545                 hotkey_orig_mask = hotkey_mask;
2546                 res = add_many_to_attr_set(
2547                                 hotkey_dev_attributes,
2548                                 hotkey_mask_attributes,
2549                                 ARRAY_SIZE(hotkey_mask_attributes));
2550                 if (res)
2551                         goto err_exit;
2552         }
2553
2554 #ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
2555         if (tp_features.hotkey_mask) {
2556                 hotkey_source_mask = TPACPI_HKEY_NVRAM_GOOD_MASK
2557                                         & ~hotkey_all_mask;
2558         } else {
2559                 hotkey_source_mask = TPACPI_HKEY_NVRAM_GOOD_MASK;
2560         }
2561
2562         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2563                     "hotkey source mask 0x%08x, polling freq %d\n",
2564                     hotkey_source_mask, hotkey_poll_freq);
2565 #endif
2566
2567 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
2568         if (dbg_wlswemul) {
2569                 tp_features.hotkey_wlsw = 1;
2570                 printk(TPACPI_INFO
2571                         "radio switch emulation enabled\n");
2572         } else
2573 #endif
2574         /* Not all thinkpads have a hardware radio switch */
2575         if (acpi_evalf(hkey_handle, &status, "WLSW", "qd")) {
2576                 tp_features.hotkey_wlsw = 1;
2577                 printk(TPACPI_INFO
2578                         "radio switch found; radios are %s\n",
2579                         enabled(status, 0));
2580         }
2581         if (tp_features.hotkey_wlsw)
2582                 res = add_to_attr_set(hotkey_dev_attributes,
2583                                 &dev_attr_hotkey_radio_sw.attr);
2584
2585         /* For X41t, X60t, X61t Tablets... */
2586         if (!res && acpi_evalf(hkey_handle, &status, "MHKG", "qd")) {
2587                 tp_features.hotkey_tablet = 1;
2588                 printk(TPACPI_INFO
2589                         "possible tablet mode switch found; "
2590                         "ThinkPad in %s mode\n",
2591                         (status & TP_HOTKEY_TABLET_MASK)?
2592                                 "tablet" : "laptop");
2593                 res = add_to_attr_set(hotkey_dev_attributes,
2594                                 &dev_attr_hotkey_tablet_mode.attr);
2595         }
2596
2597         if (!res)
2598                 res = register_attr_set_with_sysfs(
2599                                 hotkey_dev_attributes,
2600                                 &tpacpi_pdev->dev.kobj);
2601         if (res)
2602                 goto err_exit;
2603
2604         /* Set up key map */
2605
2606         hotkey_keycode_map = kmalloc(TPACPI_HOTKEY_MAP_SIZE,
2607                                         GFP_KERNEL);
2608         if (!hotkey_keycode_map) {
2609                 printk(TPACPI_ERR
2610                         "failed to allocate memory for key map\n");
2611                 res = -ENOMEM;
2612                 goto err_exit;
2613         }
2614
2615         if (thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO) {
2616                 dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2617                            "using Lenovo default hot key map\n");
2618                 memcpy(hotkey_keycode_map, &lenovo_keycode_map,
2619                         TPACPI_HOTKEY_MAP_SIZE);
2620         } else {
2621                 dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2622                            "using IBM default hot key map\n");
2623                 memcpy(hotkey_keycode_map, &ibm_keycode_map,
2624                         TPACPI_HOTKEY_MAP_SIZE);
2625         }
2626
2627         set_bit(EV_KEY, tpacpi_inputdev->evbit);
2628         set_bit(EV_MSC, tpacpi_inputdev->evbit);
2629         set_bit(MSC_SCAN, tpacpi_inputdev->mscbit);
2630         tpacpi_inputdev->keycodesize = TPACPI_HOTKEY_MAP_TYPESIZE;
2631         tpacpi_inputdev->keycodemax = TPACPI_HOTKEY_MAP_LEN;
2632         tpacpi_inputdev->keycode = hotkey_keycode_map;
2633         for (i = 0; i < TPACPI_HOTKEY_MAP_LEN; i++) {
2634                 if (hotkey_keycode_map[i] != KEY_RESERVED) {
2635                         set_bit(hotkey_keycode_map[i],
2636                                 tpacpi_inputdev->keybit);
2637                 } else {
2638                         if (i < sizeof(hotkey_reserved_mask)*8)
2639                                 hotkey_reserved_mask |= 1 << i;
2640                 }
2641         }
2642
2643         if (tp_features.hotkey_wlsw) {
2644                 set_bit(EV_SW, tpacpi_inputdev->evbit);
2645                 set_bit(SW_RFKILL_ALL, tpacpi_inputdev->swbit);
2646         }
2647         if (tp_features.hotkey_tablet) {
2648                 set_bit(EV_SW, tpacpi_inputdev->evbit);
2649                 set_bit(SW_TABLET_MODE, tpacpi_inputdev->swbit);
2650         }
2651
2652         /* Do not issue duplicate brightness change events to
2653          * userspace */
2654         if (!tp_features.bright_acpimode)
2655                 /* update bright_acpimode... */
2656                 tpacpi_check_std_acpi_brightness_support();
2657
2658         if (tp_features.bright_acpimode && acpi_video_backlight_support()) {
2659                 printk(TPACPI_INFO
2660                        "This ThinkPad has standard ACPI backlight "
2661                        "brightness control, supported by the ACPI "
2662                        "video driver\n");
2663                 printk(TPACPI_NOTICE
2664                        "Disabling thinkpad-acpi brightness events "
2665                        "by default...\n");
2666
2667                 /* The hotkey_reserved_mask change below is not
2668                  * necessary while the keys are at KEY_RESERVED in the
2669                  * default map, but better safe than sorry, leave it
2670                  * here as a marker of what we have to do, especially
2671                  * when we finally become able to set this at runtime
2672                  * on response to X.org requests */
2673                 hotkey_reserved_mask |=
2674                         (1 << TP_ACPI_HOTKEYSCAN_FNHOME)
2675                         | (1 << TP_ACPI_HOTKEYSCAN_FNEND);
2676         }
2677
2678         dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2679                         "enabling firmware HKEY event interface...\n");
2680         res = hotkey_status_set(true);
2681         if (res) {
2682                 hotkey_exit();
2683                 return res;
2684         }
2685         res = hotkey_mask_set(((hotkey_all_mask | hotkey_source_mask)
2686                                 & ~hotkey_reserved_mask)
2687                                 | hotkey_orig_mask);
2688         if (res < 0 && res != -ENXIO) {
2689                 hotkey_exit();
2690                 return res;
2691         }
2692
2693         dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
2694                         "legacy ibm/hotkey event reporting over procfs %s\n",
2695                         (hotkey_report_mode < 2) ?
2696                                 "enabled" : "disabled");
2697
2698         tpacpi_inputdev->open = &hotkey_inputdev_open;
2699         tpacpi_inputdev->close = &hotkey_inputdev_close;
2700
2701         hotkey_poll_setup_safe(1);
2702         tpacpi_send_radiosw_update();
2703         tpacpi_input_send_tabletsw();
2704
2705         return 0;
2706
2707 err_exit:
2708         delete_attr_set(hotkey_dev_attributes, &tpacpi_pdev->dev.kobj);
2709         hotkey_dev_attributes = NULL;
2710
2711         return (res < 0)? res : 1;
2712 }
2713
2714 static bool hotkey_notify_hotkey(const u32 hkey,
2715                                  bool *send_acpi_ev,
2716                                  bool *ignore_acpi_ev)
2717 {
2718         /* 0x1000-0x1FFF: key presses */
2719         unsigned int scancode = hkey & 0xfff;
2720         *send_acpi_ev = true;
2721         *ignore_acpi_ev = false;
2722
2723         if (scancode > 0 && scancode < 0x21) {
2724                 scancode--;
2725                 if (!(hotkey_source_mask & (1 << scancode))) {
2726                         tpacpi_input_send_key(scancode);
2727                         *send_acpi_ev = false;
2728                 } else {
2729                         *ignore_acpi_ev = true;
2730                 }
2731                 return true;
2732         }
2733         return false;
2734 }
2735
2736 static bool hotkey_notify_wakeup(const u32 hkey,
2737                                  bool *send_acpi_ev,
2738                                  bool *ignore_acpi_ev)
2739 {
2740         /* 0x2000-0x2FFF: Wakeup reason */
2741         *send_acpi_ev = true;
2742         *ignore_acpi_ev = false;
2743
2744         switch (hkey) {
2745         case 0x2304: /* suspend, undock */
2746         case 0x2404: /* hibernation, undock */
2747                 hotkey_wakeup_reason = TP_ACPI_WAKEUP_UNDOCK;
2748                 *ignore_acpi_ev = true;
2749                 break;
2750
2751         case 0x2305: /* suspend, bay eject */
2752         case 0x2405: /* hibernation, bay eject */
2753                 hotkey_wakeup_reason = TP_ACPI_WAKEUP_BAYEJ;
2754                 *ignore_acpi_ev = true;
2755                 break;
2756
2757         case 0x2313: /* Battery on critical low level (S3) */
2758         case 0x2413: /* Battery on critical low level (S4) */
2759                 printk(TPACPI_ALERT
2760                         "EMERGENCY WAKEUP: battery almost empty\n");
2761                 /* how to auto-heal: */
2762                 /* 2313: woke up from S3, go to S4/S5 */
2763                 /* 2413: woke up from S4, go to S5 */
2764                 break;
2765
2766         default:
2767                 return false;
2768         }
2769
2770         if (hotkey_wakeup_reason != TP_ACPI_WAKEUP_NONE) {
2771                 printk(TPACPI_INFO
2772                        "woke up due to a hot-unplug "
2773                        "request...\n");
2774                 hotkey_wakeup_reason_notify_change();
2775         }
2776         return true;
2777 }
2778
2779 static bool hotkey_notify_usrevent(const u32 hkey,
2780                                  bool *send_acpi_ev,
2781                                  bool *ignore_acpi_ev)
2782 {
2783         /* 0x5000-0x5FFF: human interface helpers */
2784         *send_acpi_ev = true;
2785         *ignore_acpi_ev = false;
2786
2787         switch (hkey) {
2788         case 0x5010: /* Lenovo new BIOS: brightness changed */
2789         case 0x500b: /* X61t: tablet pen inserted into bay */
2790         case 0x500c: /* X61t: tablet pen removed from bay */
2791                 return true;
2792
2793         case 0x5009: /* X41t-X61t: swivel up (tablet mode) */
2794         case 0x500a: /* X41t-X61t: swivel down (normal mode) */
2795                 tpacpi_input_send_tabletsw();
2796                 hotkey_tablet_mode_notify_change();
2797                 *send_acpi_ev = false;
2798                 return true;
2799
2800         case 0x5001:
2801         case 0x5002:
2802                 /* LID switch events.  Do not propagate */
2803                 *ignore_acpi_ev = true;
2804                 return true;
2805
2806         default:
2807                 return false;
2808         }
2809 }
2810
2811 static bool hotkey_notify_thermal(const u32 hkey,
2812                                  bool *send_acpi_ev,
2813                                  bool *ignore_acpi_ev)
2814 {
2815         /* 0x6000-0x6FFF: thermal alarms */
2816         *send_acpi_ev = true;
2817         *ignore_acpi_ev = false;
2818
2819         switch (hkey) {
2820         case 0x6011:
2821                 printk(TPACPI_CRIT
2822                         "THERMAL ALARM: battery is too hot!\n");
2823                 /* recommended action: warn user through gui */
2824                 return true;
2825         case 0x6012:
2826                 printk(TPACPI_ALERT
2827                         "THERMAL EMERGENCY: battery is extremely hot!\n");
2828                 /* recommended action: immediate sleep/hibernate */
2829                 return true;
2830         case 0x6021:
2831                 printk(TPACPI_CRIT
2832                         "THERMAL ALARM: "
2833                         "a sensor reports something is too hot!\n");
2834                 /* recommended action: warn user through gui, that */
2835                 /* some internal component is too hot */
2836                 return true;
2837         case 0x6022:
2838                 printk(TPACPI_ALERT
2839                         "THERMAL EMERGENCY: "
2840                         "a sensor reports something is extremely hot!\n");
2841                 /* recommended action: immediate sleep/hibernate */
2842                 return true;
2843         case 0x6030:
2844                 printk(TPACPI_INFO
2845                         "EC reports that Thermal Table has changed\n");
2846                 /* recommended action: do nothing, we don't have
2847                  * Lenovo ATM information */
2848                 return true;
2849         default:
2850                 printk(TPACPI_ALERT
2851                          "THERMAL ALERT: unknown thermal alarm received\n");
2852                 return false;
2853         }
2854 }
2855
2856 static void hotkey_notify(struct ibm_struct *ibm, u32 event)
2857 {
2858         u32 hkey;
2859         bool send_acpi_ev;
2860         bool ignore_acpi_ev;
2861         bool known_ev;
2862
2863         if (event != 0x80) {
2864                 printk(TPACPI_ERR
2865                        "unknown HKEY notification event %d\n", event);
2866                 /* forward it to userspace, maybe it knows how to handle it */
2867                 acpi_bus_generate_netlink_event(
2868                                         ibm->acpi->device->pnp.device_class,
2869                                         dev_name(&ibm->acpi->device->dev),
2870                                         event, 0);
2871                 return;
2872         }
2873
2874         while (1) {
2875                 if (!acpi_evalf(hkey_handle, &hkey, "MHKP", "d")) {
2876                         printk(TPACPI_ERR "failed to retrieve HKEY event\n");
2877                         return;
2878                 }
2879
2880                 if (hkey == 0) {
2881                         /* queue empty */
2882                         return;
2883                 }
2884
2885                 send_acpi_ev = true;
2886                 ignore_acpi_ev = false;
2887
2888                 switch (hkey >> 12) {
2889                 case 1:
2890                         /* 0x1000-0x1FFF: key presses */
2891                         known_ev = hotkey_notify_hotkey(hkey, &send_acpi_ev,
2892                                                  &ignore_acpi_ev);
2893                         break;
2894                 case 2:
2895                         /* 0x2000-0x2FFF: Wakeup reason */
2896                         known_ev = hotkey_notify_wakeup(hkey, &send_acpi_ev,
2897                                                  &ignore_acpi_ev);
2898                         break;
2899                 case 3:
2900                         /* 0x3000-0x3FFF: bay-related wakeups */
2901                         if (hkey == 0x3003) {
2902                                 hotkey_autosleep_ack = 1;
2903                                 printk(TPACPI_INFO
2904                                        "bay ejected\n");
2905                                 hotkey_wakeup_hotunplug_complete_notify_change();
2906                                 known_ev = true;
2907                         } else {
2908                                 known_ev = false;
2909                         }
2910                         break;
2911                 case 4:
2912                         /* 0x4000-0x4FFF: dock-related wakeups */
2913                         if (hkey == 0x4003) {
2914                                 hotkey_autosleep_ack = 1;
2915                                 printk(TPACPI_INFO
2916                                        "undocked\n");
2917                                 hotkey_wakeup_hotunplug_complete_notify_change();
2918                                 known_ev = true;
2919                         } else {
2920                                 known_ev = false;
2921                         }
2922                         break;
2923                 case 5:
2924                         /* 0x5000-0x5FFF: human interface helpers */
2925                         known_ev = hotkey_notify_usrevent(hkey, &send_acpi_ev,
2926                                                  &ignore_acpi_ev);
2927                         break;
2928                 case 6:
2929                         /* 0x6000-0x6FFF: thermal alarms */
2930                         known_ev = hotkey_notify_thermal(hkey, &send_acpi_ev,
2931                                                  &ignore_acpi_ev);
2932                         break;
2933                 case 7:
2934                         /* 0x7000-0x7FFF: misc */
2935                         if (tp_features.hotkey_wlsw && hkey == 0x7000) {
2936                                 tpacpi_send_radiosw_update();
2937                                 send_acpi_ev = 0;
2938                                 known_ev = true;
2939                                 break;
2940                         }
2941                         /* fallthrough to default */
2942                 default:
2943                         known_ev = false;
2944                 }
2945                 if (!known_ev) {
2946                         printk(TPACPI_NOTICE
2947                                "unhandled HKEY event 0x%04x\n", hkey);
2948                         printk(TPACPI_NOTICE
2949                                "please report the conditions when this "
2950                                "event happened to %s\n", TPACPI_MAIL);
2951                 }
2952
2953                 /* Legacy events */
2954                 if (!ignore_acpi_ev &&
2955                     (send_acpi_ev || hotkey_report_mode < 2)) {
2956                         acpi_bus_generate_proc_event(ibm->acpi->device,
2957                                                      event, hkey);
2958                 }
2959
2960                 /* netlink events */
2961                 if (!ignore_acpi_ev && send_acpi_ev) {
2962                         acpi_bus_generate_netlink_event(
2963                                         ibm->acpi->device->pnp.device_class,
2964                                         dev_name(&ibm->acpi->device->dev),
2965                                         event, hkey);
2966                 }
2967         }
2968 }
2969
2970 static void hotkey_suspend(pm_message_t state)
2971 {
2972         /* Do these on suspend, we get the events on early resume! */
2973         hotkey_wakeup_reason = TP_ACPI_WAKEUP_NONE;
2974         hotkey_autosleep_ack = 0;
2975 }
2976
2977 static void hotkey_resume(void)
2978 {
2979         tpacpi_disable_brightness_delay();
2980
2981         if (hotkey_mask_get())
2982                 printk(TPACPI_ERR
2983                        "error while trying to read hot key mask "
2984                        "from firmware\n");
2985         tpacpi_send_radiosw_update();
2986         hotkey_tablet_mode_notify_change();
2987         hotkey_wakeup_reason_notify_change();
2988         hotkey_wakeup_hotunplug_complete_notify_change();
2989         hotkey_poll_setup_safe(0);
2990 }
2991
2992 /* procfs -------------------------------------------------------------- */
2993 static int hotkey_read(char *p)
2994 {
2995         int res, status;
2996         int len = 0;
2997
2998         if (!tp_features.hotkey) {
2999                 len += sprintf(p + len, "status:\t\tnot supported\n");
3000                 return len;
3001         }
3002
3003         if (mutex_lock_killable(&hotkey_mutex))
3004                 return -ERESTARTSYS;
3005         res = hotkey_status_get(&status);
3006         if (!res)
3007                 res = hotkey_mask_get();
3008         mutex_unlock(&hotkey_mutex);
3009         if (res)
3010                 return res;
3011
3012         len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 0));
3013         if (tp_features.hotkey_mask) {
3014                 len += sprintf(p + len, "mask:\t\t0x%08x\n", hotkey_mask);
3015                 len += sprintf(p + len,
3016                                "commands:\tenable, disable, reset, <mask>\n");
3017         } else {
3018                 len += sprintf(p + len, "mask:\t\tnot supported\n");
3019                 len += sprintf(p + len, "commands:\tenable, disable, reset\n");
3020         }
3021
3022         return len;
3023 }
3024
3025 static void hotkey_enabledisable_warn(bool enable)
3026 {
3027         tpacpi_log_usertask("procfs hotkey enable/disable");
3028         if (!WARN((tpacpi_lifecycle == TPACPI_LIFE_RUNNING || !enable),
3029                         TPACPI_WARN
3030                         "hotkey enable/disable functionality has been "
3031                         "removed from the driver.  Hotkeys are always "
3032                         "enabled\n"))
3033                 printk(TPACPI_ERR
3034                         "Please remove the hotkey=enable module "
3035                         "parameter, it is deprecated.  Hotkeys are always "
3036                         "enabled\n");
3037 }
3038
3039 static int hotkey_write(char *buf)
3040 {
3041         int res;
3042         u32 mask;
3043         char *cmd;
3044
3045         if (!tp_features.hotkey)
3046                 return -ENODEV;
3047
3048         if (mutex_lock_killable(&hotkey_mutex))
3049                 return -ERESTARTSYS;
3050
3051         mask = hotkey_mask;
3052
3053         res = 0;
3054         while ((cmd = next_cmd(&buf))) {
3055                 if (strlencmp(cmd, "enable") == 0) {
3056                         hotkey_enabledisable_warn(1);
3057                 } else if (strlencmp(cmd, "disable") == 0) {
3058                         hotkey_enabledisable_warn(0);
3059                         res = -EPERM;
3060                 } else if (strlencmp(cmd, "reset") == 0) {
3061                         mask = hotkey_orig_mask;
3062                 } else if (sscanf(cmd, "0x%x", &mask) == 1) {
3063                         /* mask set */
3064                 } else if (sscanf(cmd, "%x", &mask) == 1) {
3065                         /* mask set */
3066                 } else {
3067                         res = -EINVAL;
3068                         goto errexit;
3069                 }
3070         }
3071
3072         if (!res)
3073                 tpacpi_disclose_usertask("procfs hotkey",
3074                         "set mask to 0x%08x\n", mask);
3075
3076         if (!res && mask != hotkey_mask)
3077                 res = hotkey_mask_set(mask);
3078
3079 errexit:
3080         mutex_unlock(&hotkey_mutex);
3081         return res;
3082 }
3083
3084 static const struct acpi_device_id ibm_htk_device_ids[] = {
3085         {TPACPI_ACPI_HKEY_HID, 0},
3086         {"", 0},
3087 };
3088
3089 static struct tp_acpi_drv_struct ibm_hotkey_acpidriver = {
3090         .hid = ibm_htk_device_ids,
3091         .notify = hotkey_notify,
3092         .handle = &hkey_handle,
3093         .type = ACPI_DEVICE_NOTIFY,
3094 };
3095
3096 static struct ibm_struct hotkey_driver_data = {
3097         .name = "hotkey",
3098         .read = hotkey_read,
3099         .write = hotkey_write,
3100         .exit = hotkey_exit,
3101         .resume = hotkey_resume,
3102         .suspend = hotkey_suspend,
3103         .acpi = &ibm_hotkey_acpidriver,
3104 };
3105
3106 /*************************************************************************
3107  * Bluetooth subdriver
3108  */
3109
3110 enum {
3111         /* ACPI GBDC/SBDC bits */
3112         TP_ACPI_BLUETOOTH_HWPRESENT     = 0x01, /* Bluetooth hw available */
3113         TP_ACPI_BLUETOOTH_RADIOSSW      = 0x02, /* Bluetooth radio enabled */
3114         TP_ACPI_BLUETOOTH_RESUMECTRL    = 0x04, /* Bluetooth state at resume:
3115                                                    off / last state */
3116 };
3117
3118 enum {
3119         /* ACPI \BLTH commands */
3120         TP_ACPI_BLTH_GET_ULTRAPORT_ID   = 0x00, /* Get Ultraport BT ID */
3121         TP_ACPI_BLTH_GET_PWR_ON_RESUME  = 0x01, /* Get power-on-resume state */
3122         TP_ACPI_BLTH_PWR_ON_ON_RESUME   = 0x02, /* Resume powered on */
3123         TP_ACPI_BLTH_PWR_OFF_ON_RESUME  = 0x03, /* Resume powered off */
3124         TP_ACPI_BLTH_SAVE_STATE         = 0x05, /* Save state for S4/S5 */
3125 };
3126
3127 #define TPACPI_RFK_BLUETOOTH_SW_NAME    "tpacpi_bluetooth_sw"
3128
3129 static struct rfkill *tpacpi_bluetooth_rfkill;
3130
3131 static void bluetooth_suspend(pm_message_t state)
3132 {
3133         /* Try to make sure radio will resume powered off */
3134         if (!acpi_evalf(NULL, NULL, "\\BLTH", "vd",
3135                    TP_ACPI_BLTH_PWR_OFF_ON_RESUME))
3136                 vdbg_printk(TPACPI_DBG_RFKILL,
3137                         "bluetooth power down on resume request failed\n");
3138 }
3139
3140 static int bluetooth_get_radiosw(void)
3141 {
3142         int status;
3143
3144         if (!tp_features.bluetooth)
3145                 return -ENODEV;
3146
3147         /* WLSW overrides bluetooth in firmware/hardware, reflect that */
3148         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status)
3149                 return RFKILL_STATE_HARD_BLOCKED;
3150
3151 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3152         if (dbg_bluetoothemul)
3153                 return (tpacpi_bluetooth_emulstate) ?
3154                         RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
3155 #endif
3156
3157         if (!acpi_evalf(hkey_handle, &status, "GBDC", "d"))
3158                 return -EIO;
3159
3160         return ((status & TP_ACPI_BLUETOOTH_RADIOSSW) != 0) ?
3161                 RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
3162 }
3163
3164 static void bluetooth_update_rfk(void)
3165 {
3166         int status;
3167
3168         if (!tpacpi_bluetooth_rfkill)
3169                 return;
3170
3171         status = bluetooth_get_radiosw();
3172         if (status < 0)
3173                 return;
3174         rfkill_force_state(tpacpi_bluetooth_rfkill, status);
3175
3176         vdbg_printk(TPACPI_DBG_RFKILL,
3177                 "forced rfkill state to %d\n",
3178                 status);
3179 }
3180
3181 static int bluetooth_set_radiosw(int radio_on, int update_rfk)
3182 {
3183         int status;
3184
3185         if (!tp_features.bluetooth)
3186                 return -ENODEV;
3187
3188         /* WLSW overrides bluetooth in firmware/hardware, but there is no
3189          * reason to risk weird behaviour. */
3190         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status
3191             && radio_on)
3192                 return -EPERM;
3193
3194         vdbg_printk(TPACPI_DBG_RFKILL,
3195                 "will %s bluetooth\n", radio_on ? "enable" : "disable");
3196
3197 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3198         if (dbg_bluetoothemul) {
3199                 tpacpi_bluetooth_emulstate = !!radio_on;
3200                 if (update_rfk)
3201                         bluetooth_update_rfk();
3202                 return 0;
3203         }
3204 #endif
3205
3206         /* We make sure to keep TP_ACPI_BLUETOOTH_RESUMECTRL off */
3207         if (radio_on)
3208                 status = TP_ACPI_BLUETOOTH_RADIOSSW;
3209         else
3210                 status = 0;
3211         if (!acpi_evalf(hkey_handle, NULL, "SBDC", "vd", status))
3212                 return -EIO;
3213
3214         if (update_rfk)
3215                 bluetooth_update_rfk();
3216
3217         return 0;
3218 }
3219
3220 /* sysfs bluetooth enable ---------------------------------------------- */
3221 static ssize_t bluetooth_enable_show(struct device *dev,
3222                            struct device_attribute *attr,
3223                            char *buf)
3224 {
3225         int status;
3226
3227         printk_deprecated_rfkill_attribute("bluetooth_enable");
3228
3229         status = bluetooth_get_radiosw();
3230         if (status < 0)
3231                 return status;
3232
3233         return snprintf(buf, PAGE_SIZE, "%d\n",
3234                         (status == RFKILL_STATE_UNBLOCKED) ? 1 : 0);
3235 }
3236
3237 static ssize_t bluetooth_enable_store(struct device *dev,
3238                             struct device_attribute *attr,
3239                             const char *buf, size_t count)
3240 {
3241         unsigned long t;
3242         int res;
3243
3244         printk_deprecated_rfkill_attribute("bluetooth_enable");
3245
3246         if (parse_strtoul(buf, 1, &t))
3247                 return -EINVAL;
3248
3249         tpacpi_disclose_usertask("bluetooth_enable", "set to %ld\n", t);
3250
3251         res = bluetooth_set_radiosw(t, 1);
3252
3253         return (res) ? res : count;
3254 }
3255
3256 static struct device_attribute dev_attr_bluetooth_enable =
3257         __ATTR(bluetooth_enable, S_IWUSR | S_IRUGO,
3258                 bluetooth_enable_show, bluetooth_enable_store);
3259
3260 /* --------------------------------------------------------------------- */
3261
3262 static struct attribute *bluetooth_attributes[] = {
3263         &dev_attr_bluetooth_enable.attr,
3264         NULL
3265 };
3266
3267 static const struct attribute_group bluetooth_attr_group = {
3268         .attrs = bluetooth_attributes,
3269 };
3270
3271 static int tpacpi_bluetooth_rfk_get(void *data, enum rfkill_state *state)
3272 {
3273         int bts = bluetooth_get_radiosw();
3274
3275         if (bts < 0)
3276                 return bts;
3277
3278         *state = bts;
3279         return 0;
3280 }
3281
3282 static int tpacpi_bluetooth_rfk_set(void *data, enum rfkill_state state)
3283 {
3284         dbg_printk(TPACPI_DBG_RFKILL,
3285                    "request to change radio state to %d\n", state);
3286         return bluetooth_set_radiosw((state == RFKILL_STATE_UNBLOCKED), 0);
3287 }
3288
3289 static void bluetooth_shutdown(void)
3290 {
3291         /* Order firmware to save current state to NVRAM */
3292         if (!acpi_evalf(NULL, NULL, "\\BLTH", "vd",
3293                         TP_ACPI_BLTH_SAVE_STATE))
3294                 printk(TPACPI_NOTICE
3295                         "failed to save bluetooth state to NVRAM\n");
3296         else
3297                 vdbg_printk(TPACPI_DBG_RFKILL,
3298                         "bluestooth state saved to NVRAM\n");
3299 }
3300
3301 static void bluetooth_exit(void)
3302 {
3303         bluetooth_shutdown();
3304
3305         if (tpacpi_bluetooth_rfkill)
3306                 rfkill_unregister(tpacpi_bluetooth_rfkill);
3307
3308         sysfs_remove_group(&tpacpi_pdev->dev.kobj,
3309                         &bluetooth_attr_group);
3310 }
3311
3312 static int __init bluetooth_init(struct ibm_init_struct *iibm)
3313 {
3314         int res;
3315         int status = 0;
3316
3317         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_RFKILL,
3318                         "initializing bluetooth subdriver\n");
3319
3320         TPACPI_ACPIHANDLE_INIT(hkey);
3321
3322         /* bluetooth not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
3323            G4x, R30, R31, R40e, R50e, T20-22, X20-21 */
3324         tp_features.bluetooth = hkey_handle &&
3325             acpi_evalf(hkey_handle, &status, "GBDC", "qd");
3326
3327         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_RFKILL,
3328                 "bluetooth is %s, status 0x%02x\n",
3329                 str_supported(tp_features.bluetooth),
3330                 status);
3331
3332 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3333         if (dbg_bluetoothemul) {
3334                 tp_features.bluetooth = 1;
3335                 printk(TPACPI_INFO
3336                         "bluetooth switch emulation enabled\n");
3337         } else
3338 #endif
3339         if (tp_features.bluetooth &&
3340             !(status & TP_ACPI_BLUETOOTH_HWPRESENT)) {
3341                 /* no bluetooth hardware present in system */
3342                 tp_features.bluetooth = 0;
3343                 dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_RFKILL,
3344                            "bluetooth hardware not installed\n");
3345         }
3346
3347         if (!tp_features.bluetooth)
3348                 return 1;
3349
3350         res = sysfs_create_group(&tpacpi_pdev->dev.kobj,
3351                                 &bluetooth_attr_group);
3352         if (res)
3353                 return res;
3354
3355         res = tpacpi_new_rfkill(TPACPI_RFK_BLUETOOTH_SW_ID,
3356                                 &tpacpi_bluetooth_rfkill,
3357                                 RFKILL_TYPE_BLUETOOTH,
3358                                 TPACPI_RFK_BLUETOOTH_SW_NAME,
3359                                 true,
3360                                 tpacpi_bluetooth_rfk_set,
3361                                 tpacpi_bluetooth_rfk_get);
3362         if (res) {
3363                 bluetooth_exit();
3364                 return res;
3365         }
3366
3367         return 0;
3368 }
3369
3370 /* procfs -------------------------------------------------------------- */
3371 static int bluetooth_read(char *p)
3372 {
3373         int len = 0;
3374         int status = bluetooth_get_radiosw();
3375
3376         if (!tp_features.bluetooth)
3377                 len += sprintf(p + len, "status:\t\tnot supported\n");
3378         else {
3379                 len += sprintf(p + len, "status:\t\t%s\n",
3380                                 (status == RFKILL_STATE_UNBLOCKED) ?
3381                                         "enabled" : "disabled");
3382                 len += sprintf(p + len, "commands:\tenable, disable\n");
3383         }
3384
3385         return len;
3386 }
3387
3388 static int bluetooth_write(char *buf)
3389 {
3390         char *cmd;
3391         int state = -1;
3392
3393         if (!tp_features.bluetooth)
3394                 return -ENODEV;
3395
3396         while ((cmd = next_cmd(&buf))) {
3397                 if (strlencmp(cmd, "enable") == 0) {
3398                         state = 1;
3399                 } else if (strlencmp(cmd, "disable") == 0) {
3400                         state = 0;
3401                 } else
3402                         return -EINVAL;
3403         }
3404
3405         if (state != -1) {
3406                 tpacpi_disclose_usertask("procfs bluetooth",
3407                         "attempt to %s\n",
3408                         state ? "enable" : "disable");
3409                 bluetooth_set_radiosw(state, 1);
3410         }
3411
3412         return 0;
3413 }
3414
3415 static struct ibm_struct bluetooth_driver_data = {
3416         .name = "bluetooth",
3417         .read = bluetooth_read,
3418         .write = bluetooth_write,
3419         .exit = bluetooth_exit,
3420         .suspend = bluetooth_suspend,
3421         .shutdown = bluetooth_shutdown,
3422 };
3423
3424 /*************************************************************************
3425  * Wan subdriver
3426  */
3427
3428 enum {
3429         /* ACPI GWAN/SWAN bits */
3430         TP_ACPI_WANCARD_HWPRESENT       = 0x01, /* Wan hw available */
3431         TP_ACPI_WANCARD_RADIOSSW        = 0x02, /* Wan radio enabled */
3432         TP_ACPI_WANCARD_RESUMECTRL      = 0x04, /* Wan state at resume:
3433                                                    off / last state */
3434 };
3435
3436 #define TPACPI_RFK_WWAN_SW_NAME         "tpacpi_wwan_sw"
3437
3438 static struct rfkill *tpacpi_wan_rfkill;
3439
3440 static void wan_suspend(pm_message_t state)
3441 {
3442         /* Try to make sure radio will resume powered off */
3443         if (!acpi_evalf(NULL, NULL, "\\WGSV", "qvd",
3444                    TP_ACPI_WGSV_PWR_OFF_ON_RESUME))
3445                 vdbg_printk(TPACPI_DBG_RFKILL,
3446                         "WWAN power down on resume request failed\n");
3447 }
3448
3449 static int wan_get_radiosw(void)
3450 {
3451         int status;
3452
3453         if (!tp_features.wan)
3454                 return -ENODEV;
3455
3456         /* WLSW overrides WWAN in firmware/hardware, reflect that */
3457         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status)
3458                 return RFKILL_STATE_HARD_BLOCKED;
3459
3460 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3461         if (dbg_wwanemul)
3462                 return (tpacpi_wwan_emulstate) ?
3463                         RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
3464 #endif
3465
3466         if (!acpi_evalf(hkey_handle, &status, "GWAN", "d"))
3467                 return -EIO;
3468
3469         return ((status & TP_ACPI_WANCARD_RADIOSSW) != 0) ?
3470                 RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
3471 }
3472
3473 static void wan_update_rfk(void)
3474 {
3475         int status;
3476
3477         if (!tpacpi_wan_rfkill)
3478                 return;
3479
3480         status = wan_get_radiosw();
3481         if (status < 0)
3482                 return;
3483         rfkill_force_state(tpacpi_wan_rfkill, status);
3484
3485         vdbg_printk(TPACPI_DBG_RFKILL,
3486                 "forced rfkill state to %d\n",
3487                 status);
3488 }
3489
3490 static int wan_set_radiosw(int radio_on, int update_rfk)
3491 {
3492         int status;
3493
3494         if (!tp_features.wan)
3495                 return -ENODEV;
3496
3497         /* WLSW overrides bluetooth in firmware/hardware, but there is no
3498          * reason to risk weird behaviour. */
3499         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status
3500             && radio_on)
3501                 return -EPERM;
3502
3503         vdbg_printk(TPACPI_DBG_RFKILL,
3504                 "will %s WWAN\n", radio_on ? "enable" : "disable");
3505
3506 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3507         if (dbg_wwanemul) {
3508                 tpacpi_wwan_emulstate = !!radio_on;
3509                 if (update_rfk)
3510                         wan_update_rfk();
3511                 return 0;
3512         }
3513 #endif
3514
3515         /* We make sure to keep TP_ACPI_WANCARD_RESUMECTRL off */
3516         if (radio_on)
3517                 status = TP_ACPI_WANCARD_RADIOSSW;
3518         else
3519                 status = 0;
3520         if (!acpi_evalf(hkey_handle, NULL, "SWAN", "vd", status))
3521                 return -EIO;
3522
3523         if (update_rfk)
3524                 wan_update_rfk();
3525
3526         return 0;
3527 }
3528
3529 /* sysfs wan enable ---------------------------------------------------- */
3530 static ssize_t wan_enable_show(struct device *dev,
3531                            struct device_attribute *attr,
3532                            char *buf)
3533 {
3534         int status;
3535
3536         printk_deprecated_rfkill_attribute("wwan_enable");
3537
3538         status = wan_get_radiosw();
3539         if (status < 0)
3540                 return status;
3541
3542         return snprintf(buf, PAGE_SIZE, "%d\n",
3543                         (status == RFKILL_STATE_UNBLOCKED) ? 1 : 0);
3544 }
3545
3546 static ssize_t wan_enable_store(struct device *dev,
3547                             struct device_attribute *attr,
3548                             const char *buf, size_t count)
3549 {
3550         unsigned long t;
3551         int res;
3552
3553         printk_deprecated_rfkill_attribute("wwan_enable");
3554
3555         if (parse_strtoul(buf, 1, &t))
3556                 return -EINVAL;
3557
3558         tpacpi_disclose_usertask("wwan_enable", "set to %ld\n", t);
3559
3560         res = wan_set_radiosw(t, 1);
3561
3562         return (res) ? res : count;
3563 }
3564
3565 static struct device_attribute dev_attr_wan_enable =
3566         __ATTR(wwan_enable, S_IWUSR | S_IRUGO,
3567                 wan_enable_show, wan_enable_store);
3568
3569 /* --------------------------------------------------------------------- */
3570
3571 static struct attribute *wan_attributes[] = {
3572         &dev_attr_wan_enable.attr,
3573         NULL
3574 };
3575
3576 static const struct attribute_group wan_attr_group = {
3577         .attrs = wan_attributes,
3578 };
3579
3580 static int tpacpi_wan_rfk_get(void *data, enum rfkill_state *state)
3581 {
3582         int wans = wan_get_radiosw();
3583
3584         if (wans < 0)
3585                 return wans;
3586
3587         *state = wans;
3588         return 0;
3589 }
3590
3591 static int tpacpi_wan_rfk_set(void *data, enum rfkill_state state)
3592 {
3593         dbg_printk(TPACPI_DBG_RFKILL,
3594                    "request to change radio state to %d\n", state);
3595         return wan_set_radiosw((state == RFKILL_STATE_UNBLOCKED), 0);
3596 }
3597
3598 static void wan_shutdown(void)
3599 {
3600         /* Order firmware to save current state to NVRAM */
3601         if (!acpi_evalf(NULL, NULL, "\\WGSV", "vd",
3602                         TP_ACPI_WGSV_SAVE_STATE))
3603                 printk(TPACPI_NOTICE
3604                         "failed to save WWAN state to NVRAM\n");
3605         else
3606                 vdbg_printk(TPACPI_DBG_RFKILL,
3607                         "WWAN state saved to NVRAM\n");
3608 }
3609
3610 static void wan_exit(void)
3611 {
3612         wan_shutdown();
3613
3614         if (tpacpi_wan_rfkill)
3615                 rfkill_unregister(tpacpi_wan_rfkill);
3616
3617         sysfs_remove_group(&tpacpi_pdev->dev.kobj,
3618                 &wan_attr_group);
3619 }
3620
3621 static int __init wan_init(struct ibm_init_struct *iibm)
3622 {
3623         int res;
3624         int status = 0;
3625
3626         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_RFKILL,
3627                         "initializing wan subdriver\n");
3628
3629         TPACPI_ACPIHANDLE_INIT(hkey);
3630
3631         tp_features.wan = hkey_handle &&
3632             acpi_evalf(hkey_handle, &status, "GWAN", "qd");
3633
3634         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_RFKILL,
3635                 "wan is %s, status 0x%02x\n",
3636                 str_supported(tp_features.wan),
3637                 status);
3638
3639 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3640         if (dbg_wwanemul) {
3641                 tp_features.wan = 1;
3642                 printk(TPACPI_INFO
3643                         "wwan switch emulation enabled\n");
3644         } else
3645 #endif
3646         if (tp_features.wan &&
3647             !(status & TP_ACPI_WANCARD_HWPRESENT)) {
3648                 /* no wan hardware present in system */
3649                 tp_features.wan = 0;
3650                 dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_RFKILL,
3651                            "wan hardware not installed\n");
3652         }
3653
3654         if (!tp_features.wan)
3655                 return 1;
3656
3657         res = sysfs_create_group(&tpacpi_pdev->dev.kobj,
3658                                 &wan_attr_group);
3659         if (res)
3660                 return res;
3661
3662         res = tpacpi_new_rfkill(TPACPI_RFK_WWAN_SW_ID,
3663                                 &tpacpi_wan_rfkill,
3664                                 RFKILL_TYPE_WWAN,
3665                                 TPACPI_RFK_WWAN_SW_NAME,
3666                                 true,
3667                                 tpacpi_wan_rfk_set,
3668                                 tpacpi_wan_rfk_get);
3669         if (res) {
3670                 wan_exit();
3671                 return res;
3672         }
3673
3674         return 0;
3675 }
3676
3677 /* procfs -------------------------------------------------------------- */
3678 static int wan_read(char *p)
3679 {
3680         int len = 0;
3681         int status = wan_get_radiosw();
3682
3683         tpacpi_disclose_usertask("procfs wan", "read");
3684
3685         if (!tp_features.wan)
3686                 len += sprintf(p + len, "status:\t\tnot supported\n");
3687         else {
3688                 len += sprintf(p + len, "status:\t\t%s\n",
3689                                 (status == RFKILL_STATE_UNBLOCKED) ?
3690                                         "enabled" : "disabled");
3691                 len += sprintf(p + len, "commands:\tenable, disable\n");
3692         }
3693
3694         return len;
3695 }
3696
3697 static int wan_write(char *buf)
3698 {
3699         char *cmd;
3700         int state = -1;
3701
3702         if (!tp_features.wan)
3703                 return -ENODEV;
3704
3705         while ((cmd = next_cmd(&buf))) {
3706                 if (strlencmp(cmd, "enable") == 0) {
3707                         state = 1;
3708                 } else if (strlencmp(cmd, "disable") == 0) {
3709                         state = 0;
3710                 } else
3711                         return -EINVAL;
3712         }
3713
3714         if (state != -1) {
3715                 tpacpi_disclose_usertask("procfs wan",
3716                         "attempt to %s\n",
3717                         state ? "enable" : "disable");
3718                 wan_set_radiosw(state, 1);
3719         }
3720
3721         return 0;
3722 }
3723
3724 static struct ibm_struct wan_driver_data = {
3725         .name = "wan",
3726         .read = wan_read,
3727         .write = wan_write,
3728         .exit = wan_exit,
3729         .suspend = wan_suspend,
3730         .shutdown = wan_shutdown,
3731 };
3732
3733 /*************************************************************************
3734  * UWB subdriver
3735  */
3736
3737 enum {
3738         /* ACPI GUWB/SUWB bits */
3739         TP_ACPI_UWB_HWPRESENT   = 0x01, /* UWB hw available */
3740         TP_ACPI_UWB_RADIOSSW    = 0x02, /* UWB radio enabled */
3741 };
3742
3743 #define TPACPI_RFK_UWB_SW_NAME  "tpacpi_uwb_sw"
3744
3745 static struct rfkill *tpacpi_uwb_rfkill;
3746
3747 static int uwb_get_radiosw(void)
3748 {
3749         int status;
3750
3751         if (!tp_features.uwb)
3752                 return -ENODEV;
3753
3754         /* WLSW overrides UWB in firmware/hardware, reflect that */
3755         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status)
3756                 return RFKILL_STATE_HARD_BLOCKED;
3757
3758 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3759         if (dbg_uwbemul)
3760                 return (tpacpi_uwb_emulstate) ?
3761                         RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
3762 #endif
3763
3764         if (!acpi_evalf(hkey_handle, &status, "GUWB", "d"))
3765                 return -EIO;
3766
3767         return ((status & TP_ACPI_UWB_RADIOSSW) != 0) ?
3768                 RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
3769 }
3770
3771 static void uwb_update_rfk(void)
3772 {
3773         int status;
3774
3775         if (!tpacpi_uwb_rfkill)
3776                 return;
3777
3778         status = uwb_get_radiosw();
3779         if (status < 0)
3780                 return;
3781         rfkill_force_state(tpacpi_uwb_rfkill, status);
3782
3783         vdbg_printk(TPACPI_DBG_RFKILL,
3784                 "forced rfkill state to %d\n",
3785                 status);
3786 }
3787
3788 static int uwb_set_radiosw(int radio_on, int update_rfk)
3789 {
3790         int status;
3791
3792         if (!tp_features.uwb)
3793                 return -ENODEV;
3794
3795         /* WLSW overrides UWB in firmware/hardware, but there is no
3796          * reason to risk weird behaviour. */
3797         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status
3798             && radio_on)
3799                 return -EPERM;
3800
3801         vdbg_printk(TPACPI_DBG_RFKILL,
3802                         "will %s UWB\n", radio_on ? "enable" : "disable");
3803
3804 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3805         if (dbg_uwbemul) {
3806                 tpacpi_uwb_emulstate = !!radio_on;
3807                 if (update_rfk)
3808                         uwb_update_rfk();
3809                 return 0;
3810         }
3811 #endif
3812
3813         status = (radio_on) ? TP_ACPI_UWB_RADIOSSW : 0;
3814         if (!acpi_evalf(hkey_handle, NULL, "SUWB", "vd", status))
3815                 return -EIO;
3816
3817         if (update_rfk)
3818                 uwb_update_rfk();
3819
3820         return 0;
3821 }
3822
3823 /* --------------------------------------------------------------------- */
3824
3825 static int tpacpi_uwb_rfk_get(void *data, enum rfkill_state *state)
3826 {
3827         int uwbs = uwb_get_radiosw();
3828
3829         if (uwbs < 0)
3830                 return uwbs;
3831
3832         *state = uwbs;
3833         return 0;
3834 }
3835
3836 static int tpacpi_uwb_rfk_set(void *data, enum rfkill_state state)
3837 {
3838         dbg_printk(TPACPI_DBG_RFKILL,
3839                    "request to change radio state to %d\n", state);
3840         return uwb_set_radiosw((state == RFKILL_STATE_UNBLOCKED), 0);
3841 }
3842
3843 static void uwb_exit(void)
3844 {
3845         if (tpacpi_uwb_rfkill)
3846                 rfkill_unregister(tpacpi_uwb_rfkill);
3847 }
3848
3849 static int __init uwb_init(struct ibm_init_struct *iibm)
3850 {
3851         int res;
3852         int status = 0;
3853
3854         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_RFKILL,
3855                         "initializing uwb subdriver\n");
3856
3857         TPACPI_ACPIHANDLE_INIT(hkey);
3858
3859         tp_features.uwb = hkey_handle &&
3860             acpi_evalf(hkey_handle, &status, "GUWB", "qd");
3861
3862         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_RFKILL,
3863                 "uwb is %s, status 0x%02x\n",
3864                 str_supported(tp_features.uwb),
3865                 status);
3866
3867 #ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
3868         if (dbg_uwbemul) {
3869                 tp_features.uwb = 1;
3870                 printk(TPACPI_INFO
3871                         "uwb switch emulation enabled\n");
3872         } else
3873 #endif
3874         if (tp_features.uwb &&
3875             !(status & TP_ACPI_UWB_HWPRESENT)) {
3876                 /* no uwb hardware present in system */
3877                 tp_features.uwb = 0;
3878                 dbg_printk(TPACPI_DBG_INIT,
3879                            "uwb hardware not installed\n");
3880         }
3881
3882         if (!tp_features.uwb)
3883                 return 1;
3884
3885         res = tpacpi_new_rfkill(TPACPI_RFK_UWB_SW_ID,
3886                                 &tpacpi_uwb_rfkill,
3887                                 RFKILL_TYPE_UWB,
3888                                 TPACPI_RFK_UWB_SW_NAME,
3889                                 false,
3890                                 tpacpi_uwb_rfk_set,
3891                                 tpacpi_uwb_rfk_get);
3892
3893         return res;
3894 }
3895
3896 static struct ibm_struct uwb_driver_data = {
3897         .name = "uwb",
3898         .exit = uwb_exit,
3899         .flags.experimental = 1,
3900 };
3901
3902 /*************************************************************************
3903  * Video subdriver
3904  */
3905
3906 #ifdef CONFIG_THINKPAD_ACPI_VIDEO
3907
3908 enum video_access_mode {
3909         TPACPI_VIDEO_NONE = 0,
3910         TPACPI_VIDEO_570,       /* 570 */
3911         TPACPI_VIDEO_770,       /* 600e/x, 770e, 770x */
3912         TPACPI_VIDEO_NEW,       /* all others */
3913 };
3914
3915 enum {  /* video status flags, based on VIDEO_570 */
3916         TP_ACPI_VIDEO_S_LCD = 0x01,     /* LCD output enabled */
3917         TP_ACPI_VIDEO_S_CRT = 0x02,     /* CRT output enabled */
3918         TP_ACPI_VIDEO_S_DVI = 0x08,     /* DVI output enabled */
3919 };
3920
3921 enum {  /* TPACPI_VIDEO_570 constants */
3922         TP_ACPI_VIDEO_570_PHSCMD = 0x87,        /* unknown magic constant :( */
3923         TP_ACPI_VIDEO_570_PHSMASK = 0x03,       /* PHS bits that map to
3924                                                  * video_status_flags */
3925         TP_ACPI_VIDEO_570_PHS2CMD = 0x8b,       /* unknown magic constant :( */
3926         TP_ACPI_VIDEO_570_PHS2SET = 0x80,       /* unknown magic constant :( */
3927 };
3928
3929 static enum video_access_mode video_supported;
3930 static int video_orig_autosw;
3931
3932 static int video_autosw_get(void);
3933 static int video_autosw_set(int enable);
3934
3935 TPACPI_HANDLE(vid2, root, "\\_SB.PCI0.AGPB.VID");       /* G41 */
3936
3937 static int __init video_init(struct ibm_init_struct *iibm)
3938 {
3939         int ivga;
3940
3941         vdbg_printk(TPACPI_DBG_INIT, "initializing video subdriver\n");
3942
3943         TPACPI_ACPIHANDLE_INIT(vid);
3944         TPACPI_ACPIHANDLE_INIT(vid2);
3945
3946         if (vid2_handle && acpi_evalf(NULL, &ivga, "\\IVGA", "d") && ivga)
3947                 /* G41, assume IVGA doesn't change */
3948                 vid_handle = vid2_handle;
3949
3950         if (!vid_handle)
3951                 /* video switching not supported on R30, R31 */
3952                 video_supported = TPACPI_VIDEO_NONE;
3953         else if (acpi_evalf(vid_handle, &video_orig_autosw, "SWIT", "qd"))
3954                 /* 570 */
3955                 video_supported = TPACPI_VIDEO_570;
3956         else if (acpi_evalf(vid_handle, &video_orig_autosw, "^VADL", "qd"))
3957                 /* 600e/x, 770e, 770x */
3958                 video_supported = TPACPI_VIDEO_770;
3959         else
3960                 /* all others */
3961                 video_supported = TPACPI_VIDEO_NEW;
3962
3963         vdbg_printk(TPACPI_DBG_INIT, "video is %s, mode %d\n",
3964                 str_supported(video_supported != TPACPI_VIDEO_NONE),
3965                 video_supported);
3966
3967         return (video_supported != TPACPI_VIDEO_NONE)? 0 : 1;
3968 }
3969
3970 static void video_exit(void)
3971 {
3972         dbg_printk(TPACPI_DBG_EXIT,
3973                    "restoring original video autoswitch mode\n");
3974         if (video_autosw_set(video_orig_autosw))
3975                 printk(TPACPI_ERR "error while trying to restore original "
3976                         "video autoswitch mode\n");
3977 }
3978
3979 static int video_outputsw_get(void)
3980 {
3981         int status = 0;
3982         int i;
3983
3984         switch (video_supported) {
3985         case TPACPI_VIDEO_570:
3986                 if (!acpi_evalf(NULL, &i, "\\_SB.PHS", "dd",
3987                                  TP_ACPI_VIDEO_570_PHSCMD))
3988                         return -EIO;
3989                 status = i & TP_ACPI_VIDEO_570_PHSMASK;
3990                 break;
3991         case TPACPI_VIDEO_770:
3992                 if (!acpi_evalf(NULL, &i, "\\VCDL", "d"))
3993                         return -EIO;
3994                 if (i)
3995                         status |= TP_ACPI_VIDEO_S_LCD;
3996                 if (!acpi_evalf(NULL, &i, "\\VCDC", "d"))
3997                         return -EIO;
3998                 if (i)
3999                         status |= TP_ACPI_VIDEO_S_CRT;
4000                 break;
4001         case TPACPI_VIDEO_NEW:
4002                 if (!acpi_evalf(NULL, NULL, "\\VUPS", "vd", 1) ||
4003                     !acpi_evalf(NULL, &i, "\\VCDC", "d"))
4004                         return -EIO;
4005                 if (i)
4006                         status |= TP_ACPI_VIDEO_S_CRT;
4007
4008                 if (!acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0) ||
4009                     !acpi_evalf(NULL, &i, "\\VCDL", "d"))
4010                         return -EIO;
4011                 if (i)
4012                         status |= TP_ACPI_VIDEO_S_LCD;
4013                 if (!acpi_evalf(NULL, &i, "\\VCDD", "d"))
4014                         return -EIO;
4015                 if (i)
4016                         status |= TP_ACPI_VIDEO_S_DVI;
4017                 break;
4018         default:
4019                 return -ENOSYS;
4020         }
4021
4022         return status;
4023 }
4024
4025 static int video_outputsw_set(int status)
4026 {
4027         int autosw;
4028         int res = 0;
4029
4030         switch (video_supported) {
4031         case TPACPI_VIDEO_570:
4032                 res = acpi_evalf(NULL, NULL,
4033                                  "\\_SB.PHS2", "vdd",
4034                                  TP_ACPI_VIDEO_570_PHS2CMD,
4035                                  status | TP_ACPI_VIDEO_570_PHS2SET);
4036                 break;
4037         case TPACPI_VIDEO_770:
4038                 autosw = video_autosw_get();
4039                 if (autosw < 0)
4040                         return autosw;
4041
4042                 res = video_autosw_set(1);
4043                 if (res)
4044                         return res;
4045                 res = acpi_evalf(vid_handle, NULL,
4046                                  "ASWT", "vdd", status * 0x100, 0);
4047                 if (!autosw && video_autosw_set(autosw)) {
4048                         printk(TPACPI_ERR
4049                                "video auto-switch left enabled due to error\n");
4050                         return -EIO;
4051                 }
4052                 break;
4053         case TPACPI_VIDEO_NEW:
4054                 res = acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0x80) &&
4055                       acpi_evalf(NULL, NULL, "\\VSDS", "vdd", status, 1);
4056                 break;
4057         default:
4058                 return -ENOSYS;
4059         }
4060
4061         return (res)? 0 : -EIO;
4062 }
4063
4064 static int video_autosw_get(void)
4065 {
4066         int autosw = 0;
4067
4068         switch (video_supported) {
4069         case TPACPI_VIDEO_570:
4070                 if (!acpi_evalf(vid_handle, &autosw, "SWIT", "d"))
4071                         return -EIO;
4072                 break;
4073         case TPACPI_VIDEO_770:
4074         case TPACPI_VIDEO_NEW:
4075                 if (!acpi_evalf(vid_handle, &autosw, "^VDEE", "d"))
4076                         return -EIO;
4077                 break;
4078         default:
4079                 return -ENOSYS;
4080         }
4081
4082         return autosw & 1;
4083 }
4084
4085 static int video_autosw_set(int enable)
4086 {
4087         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", (enable)? 1 : 0))
4088                 return -EIO;
4089         return 0;
4090 }
4091
4092 static int video_outputsw_cycle(void)
4093 {
4094         int autosw = video_autosw_get();
4095         int res;
4096
4097         if (autosw < 0)
4098                 return autosw;
4099
4100         switch (video_supported) {
4101         case TPACPI_VIDEO_570:
4102                 res = video_autosw_set(1);
4103                 if (res)
4104                         return res;
4105                 res = acpi_evalf(ec_handle, NULL, "_Q16", "v");
4106                 break;
4107         case TPACPI_VIDEO_770:
4108         case TPACPI_VIDEO_NEW:
4109                 res = video_autosw_set(1);
4110                 if (res)
4111                         return res;
4112                 res = acpi_evalf(vid_handle, NULL, "VSWT", "v");
4113                 break;
4114         default:
4115                 return -ENOSYS;
4116         }
4117         if (!autosw && video_autosw_set(autosw)) {
4118                 printk(TPACPI_ERR
4119                        "video auto-switch left enabled due to error\n");
4120                 return -EIO;
4121         }
4122
4123         return (res)? 0 : -EIO;
4124 }
4125
4126 static int video_expand_toggle(void)
4127 {
4128         switch (video_supported) {
4129         case TPACPI_VIDEO_570:
4130                 return acpi_evalf(ec_handle, NULL, "_Q17", "v")?
4131                         0 : -EIO;
4132         case TPACPI_VIDEO_770:
4133                 return acpi_evalf(vid_handle, NULL, "VEXP", "v")?
4134                         0 : -EIO;
4135         case TPACPI_VIDEO_NEW:
4136                 return acpi_evalf(NULL, NULL, "\\VEXP", "v")?
4137                         0 : -EIO;
4138         default:
4139                 return -ENOSYS;
4140         }
4141         /* not reached */
4142 }
4143
4144 static int video_read(char *p)
4145 {
4146         int status, autosw;
4147         int len = 0;
4148
4149         if (video_supported == TPACPI_VIDEO_NONE) {
4150                 len += sprintf(p + len, "status:\t\tnot supported\n");
4151                 return len;
4152         }
4153
4154         status = video_outputsw_get();
4155         if (status < 0)
4156                 return status;
4157
4158         autosw = video_autosw_get();
4159         if (autosw < 0)
4160                 return autosw;
4161
4162         len += sprintf(p + len, "status:\t\tsupported\n");
4163         len += sprintf(p + len, "lcd:\t\t%s\n", enabled(status, 0));
4164         len += sprintf(p + len, "crt:\t\t%s\n", enabled(status, 1));
4165         if (video_supported == TPACPI_VIDEO_NEW)
4166                 len += sprintf(p + len, "dvi:\t\t%s\n", enabled(status, 3));
4167         len += sprintf(p + len, "auto:\t\t%s\n", enabled(autosw, 0));
4168         len += sprintf(p + len, "commands:\tlcd_enable, lcd_disable\n");
4169         len += sprintf(p + len, "commands:\tcrt_enable, crt_disable\n");
4170         if (video_supported == TPACPI_VIDEO_NEW)
4171                 len += sprintf(p + len, "commands:\tdvi_enable, dvi_disable\n");
4172         len += sprintf(p + len, "commands:\tauto_enable, auto_disable\n");
4173         len += sprintf(p + len, "commands:\tvideo_switch, expand_toggle\n");
4174
4175         return len;
4176 }
4177
4178 static int video_write(char *buf)
4179 {
4180         char *cmd;
4181         int enable, disable, status;
4182         int res;
4183
4184         if (video_supported == TPACPI_VIDEO_NONE)
4185                 return -ENODEV;
4186
4187         enable = 0;
4188         disable = 0;
4189
4190         while ((cmd = next_cmd(&buf))) {
4191                 if (strlencmp(cmd, "lcd_enable") == 0) {
4192                         enable |= TP_ACPI_VIDEO_S_LCD;
4193                 } else if (strlencmp(cmd, "lcd_disable") == 0) {
4194                         disable |= TP_ACPI_VIDEO_S_LCD;
4195                 } else if (strlencmp(cmd, "crt_enable") == 0) {
4196                         enable |= TP_ACPI_VIDEO_S_CRT;
4197                 } else if (strlencmp(cmd, "crt_disable") == 0) {
4198                         disable |= TP_ACPI_VIDEO_S_CRT;
4199                 } else if (video_supported == TPACPI_VIDEO_NEW &&
4200                            strlencmp(cmd, "dvi_enable") == 0) {
4201                         enable |= TP_ACPI_VIDEO_S_DVI;
4202                 } else if (video_supported == TPACPI_VIDEO_NEW &&
4203                            strlencmp(cmd, "dvi_disable") == 0) {
4204                         disable |= TP_ACPI_VIDEO_S_DVI;
4205                 } else if (strlencmp(cmd, "auto_enable") == 0) {
4206                         res = video_autosw_set(1);
4207                         if (res)
4208                                 return res;
4209                 } else if (strlencmp(cmd, "auto_disable") == 0) {
4210                         res = video_autosw_set(0);
4211                         if (res)
4212                                 return res;
4213                 } else if (strlencmp(cmd, "video_switch") == 0) {
4214                         res = video_outputsw_cycle();
4215                         if (res)
4216                                 return res;
4217                 } else if (strlencmp(cmd, "expand_toggle") == 0) {
4218                         res = video_expand_toggle();
4219                         if (res)
4220                                 return res;
4221                 } else
4222                         return -EINVAL;
4223         }
4224
4225         if (enable || disable) {
4226                 status = video_outputsw_get();
4227                 if (status < 0)
4228                         return status;
4229                 res = video_outputsw_set((status & ~disable) | enable);
4230                 if (res)
4231                         return res;
4232         }
4233
4234         return 0;
4235 }
4236
4237 static struct ibm_struct video_driver_data = {
4238         .name = "video",
4239         .read = video_read,
4240         .write = video_write,
4241         .exit = video_exit,
4242 };
4243
4244 #endif /* CONFIG_THINKPAD_ACPI_VIDEO */
4245
4246 /*************************************************************************
4247  * Light (thinklight) subdriver
4248  */
4249
4250 TPACPI_HANDLE(lght, root, "\\LGHT");    /* A21e, A2xm/p, T20-22, X20-21 */
4251 TPACPI_HANDLE(ledb, ec, "LEDB");                /* G4x */
4252
4253 static int light_get_status(void)
4254 {
4255         int status = 0;
4256
4257         if (tp_features.light_status) {
4258                 if (!acpi_evalf(ec_handle, &status, "KBLT", "d"))
4259                         return -EIO;
4260                 return (!!status);
4261         }
4262
4263         return -ENXIO;
4264 }
4265
4266 static int light_set_status(int status)
4267 {
4268         int rc;
4269
4270         if (tp_features.light) {
4271                 if (cmos_handle) {
4272                         rc = acpi_evalf(cmos_handle, NULL, NULL, "vd",
4273                                         (status)?
4274                                                 TP_CMOS_THINKLIGHT_ON :
4275                                                 TP_CMOS_THINKLIGHT_OFF);
4276                 } else {
4277                         rc = acpi_evalf(lght_handle, NULL, NULL, "vd",
4278                                         (status)? 1 : 0);
4279                 }
4280                 return (rc)? 0 : -EIO;
4281         }
4282
4283         return -ENXIO;
4284 }
4285
4286 static void light_set_status_worker(struct work_struct *work)
4287 {
4288         struct tpacpi_led_classdev *data =
4289                         container_of(work, struct tpacpi_led_classdev, work);
4290
4291         if (likely(tpacpi_lifecycle == TPACPI_LIFE_RUNNING))
4292                 light_set_status((data->new_state != TPACPI_LED_OFF));
4293 }
4294
4295 static void light_sysfs_set(struct led_classdev *led_cdev,
4296                         enum led_brightness brightness)
4297 {
4298         struct tpacpi_led_classdev *data =
4299                 container_of(led_cdev,
4300                              struct tpacpi_led_classdev,
4301                              led_classdev);
4302         data->new_state = (brightness != LED_OFF) ?
4303                                 TPACPI_LED_ON : TPACPI_LED_OFF;
4304         queue_work(tpacpi_wq, &data->work);
4305 }
4306
4307 static enum led_brightness light_sysfs_get(struct led_classdev *led_cdev)
4308 {
4309         return (light_get_status() == 1)? LED_FULL : LED_OFF;
4310 }
4311
4312 static struct tpacpi_led_classdev tpacpi_led_thinklight = {
4313         .led_classdev = {
4314                 .name           = "tpacpi::thinklight",
4315                 .brightness_set = &light_sysfs_set,
4316                 .brightness_get = &light_sysfs_get,
4317         }
4318 };
4319
4320 static int __init light_init(struct ibm_init_struct *iibm)
4321 {
4322         int rc;
4323
4324         vdbg_printk(TPACPI_DBG_INIT, "initializing light subdriver\n");
4325
4326         TPACPI_ACPIHANDLE_INIT(ledb);
4327         TPACPI_ACPIHANDLE_INIT(lght);
4328         TPACPI_ACPIHANDLE_INIT(cmos);
4329         INIT_WORK(&tpacpi_led_thinklight.work, light_set_status_worker);
4330
4331         /* light not supported on 570, 600e/x, 770e, 770x, G4x, R30, R31 */
4332         tp_features.light = (cmos_handle || lght_handle) && !ledb_handle;
4333
4334         if (tp_features.light)
4335                 /* light status not supported on
4336                    570, 600e/x, 770e, 770x, G4x, R30, R31, R32, X20 */
4337                 tp_features.light_status =
4338                         acpi_evalf(ec_handle, NULL, "KBLT", "qv");
4339
4340         vdbg_printk(TPACPI_DBG_INIT, "light is %s, light status is %s\n",
4341                 str_supported(tp_features.light),
4342                 str_supported(tp_features.light_status));
4343
4344         if (!tp_features.light)
4345                 return 1;
4346
4347         rc = led_classdev_register(&tpacpi_pdev->dev,
4348                                    &tpacpi_led_thinklight.led_classdev);
4349
4350         if (rc < 0) {
4351                 tp_features.light = 0;
4352                 tp_features.light_status = 0;
4353         } else  {
4354                 rc = 0;
4355         }
4356
4357         return rc;
4358 }
4359
4360 static void light_exit(void)
4361 {
4362         led_classdev_unregister(&tpacpi_led_thinklight.led_classdev);
4363         if (work_pending(&tpacpi_led_thinklight.work))
4364                 flush_workqueue(tpacpi_wq);
4365 }
4366
4367 static int light_read(char *p)
4368 {
4369         int len = 0;
4370         int status;
4371
4372         if (!tp_features.light) {
4373                 len += sprintf(p + len, "status:\t\tnot supported\n");
4374         } else if (!tp_features.light_status) {
4375                 len += sprintf(p + len, "status:\t\tunknown\n");
4376                 len += sprintf(p + len, "commands:\ton, off\n");
4377         } else {
4378                 status = light_get_status();
4379                 if (status < 0)
4380                         return status;
4381                 len += sprintf(p + len, "status:\t\t%s\n", onoff(status, 0));
4382                 len += sprintf(p + len, "commands:\ton, off\n");
4383         }
4384
4385         return len;
4386 }
4387
4388 static int light_write(char *buf)
4389 {
4390         char *cmd;
4391         int newstatus = 0;
4392
4393         if (!tp_features.light)
4394                 return -ENODEV;
4395
4396         while ((cmd = next_cmd(&buf))) {
4397                 if (strlencmp(cmd, "on") == 0) {
4398                         newstatus = 1;
4399                 } else if (strlencmp(cmd, "off") == 0) {
4400                         newstatus = 0;
4401                 } else
4402                         return -EINVAL;
4403         }
4404
4405         return light_set_status(newstatus);
4406 }
4407
4408 static struct ibm_struct light_driver_data = {
4409         .name = "light",
4410         .read = light_read,
4411         .write = light_write,
4412         .exit = light_exit,
4413 };
4414
4415 /*************************************************************************
4416  * Dock subdriver
4417  */
4418
4419 #ifdef CONFIG_THINKPAD_ACPI_DOCK
4420
4421 static void dock_notify(struct ibm_struct *ibm, u32 event);
4422 static int dock_read(char *p);
4423 static int dock_write(char *buf);
4424
4425 TPACPI_HANDLE(dock, root, "\\_SB.GDCK", /* X30, X31, X40 */
4426            "\\_SB.PCI0.DOCK",   /* 600e/x,770e,770x,A2xm/p,T20-22,X20-21 */
4427            "\\_SB.PCI0.PCI1.DOCK",      /* all others */
4428            "\\_SB.PCI.ISA.SLCE",        /* 570 */
4429     );                          /* A21e,G4x,R30,R31,R32,R40,R40e,R50e */
4430
4431 /* don't list other alternatives as we install a notify handler on the 570 */
4432 TPACPI_HANDLE(pci, root, "\\_SB.PCI");  /* 570 */
4433
4434 static const struct acpi_device_id ibm_pci_device_ids[] = {
4435         {PCI_ROOT_HID_STRING, 0},
4436         {"", 0},
4437 };
4438
4439 static struct tp_acpi_drv_struct ibm_dock_acpidriver[2] = {
4440         {
4441          .notify = dock_notify,
4442          .handle = &dock_handle,
4443          .type = ACPI_SYSTEM_NOTIFY,
4444         },
4445         {
4446         /* THIS ONE MUST NEVER BE USED FOR DRIVER AUTOLOADING.
4447          * We just use it to get notifications of dock hotplug
4448          * in very old thinkpads */
4449          .hid = ibm_pci_device_ids,
4450          .notify = dock_notify,
4451          .handle = &pci_handle,
4452          .type = ACPI_SYSTEM_NOTIFY,
4453         },
4454 };
4455
4456 static struct ibm_struct dock_driver_data[2] = {
4457         {
4458          .name = "dock",
4459          .read = dock_read,
4460          .write = dock_write,
4461          .acpi = &ibm_dock_acpidriver[0],
4462         },
4463         {
4464          .name = "dock",
4465          .acpi = &ibm_dock_acpidriver[1],
4466         },
4467 };
4468
4469 #define dock_docked() (_sta(dock_handle) & 1)
4470
4471 static int __init dock_init(struct ibm_init_struct *iibm)
4472 {
4473         vdbg_printk(TPACPI_DBG_INIT, "initializing dock subdriver\n");
4474
4475         TPACPI_ACPIHANDLE_INIT(dock);
4476
4477         vdbg_printk(TPACPI_DBG_INIT, "dock is %s\n",
4478                 str_supported(dock_handle != NULL));
4479
4480         return (dock_handle)? 0 : 1;
4481 }
4482
4483 static int __init dock_init2(struct ibm_init_struct *iibm)
4484 {
4485         int dock2_needed;
4486
4487         vdbg_printk(TPACPI_DBG_INIT, "initializing dock subdriver part 2\n");
4488
4489         if (dock_driver_data[0].flags.acpi_driver_registered &&
4490             dock_driver_data[0].flags.acpi_notify_installed) {
4491                 TPACPI_ACPIHANDLE_INIT(pci);
4492                 dock2_needed = (pci_handle != NULL);
4493                 vdbg_printk(TPACPI_DBG_INIT,
4494                             "dock PCI handler for the TP 570 is %s\n",
4495                             str_supported(dock2_needed));
4496         } else {
4497                 vdbg_printk(TPACPI_DBG_INIT,
4498                 "dock subdriver part 2 not required\n");
4499                 dock2_needed = 0;
4500         }
4501
4502         return (dock2_needed)? 0 : 1;
4503 }
4504
4505 static void dock_notify(struct ibm_struct *ibm, u32 event)
4506 {
4507         int docked = dock_docked();
4508         int pci = ibm->acpi->hid && ibm->acpi->device &&
4509                 acpi_match_device_ids(ibm->acpi->device, ibm_pci_device_ids);
4510         int data;
4511
4512         if (event == 1 && !pci) /* 570 */
4513                 data = 1;       /* button */
4514         else if (event == 1 && pci)     /* 570 */
4515                 data = 3;       /* dock */
4516         else if (event == 3 && docked)
4517                 data = 1;       /* button */
4518         else if (event == 3 && !docked)
4519                 data = 2;       /* undock */
4520         else if (event == 0 && docked)
4521                 data = 3;       /* dock */
4522         else {
4523                 printk(TPACPI_ERR "unknown dock event %d, status %d\n",
4524                        event, _sta(dock_handle));
4525                 data = 0;       /* unknown */
4526         }
4527         acpi_bus_generate_proc_event(ibm->acpi->device, event, data);
4528         acpi_bus_generate_netlink_event(ibm->acpi->device->pnp.device_class,
4529                                           dev_name(&ibm->acpi->device->dev),
4530                                           event, data);
4531 }
4532
4533 static int dock_read(char *p)
4534 {
4535         int len = 0;
4536         int docked = dock_docked();
4537
4538         if (!dock_handle)
4539                 len += sprintf(p + len, "status:\t\tnot supported\n");
4540         else if (!docked)
4541                 len += sprintf(p + len, "status:\t\tundocked\n");
4542         else {
4543                 len += sprintf(p + len, "status:\t\tdocked\n");
4544                 len += sprintf(p + len, "commands:\tdock, undock\n");
4545         }
4546
4547         return len;
4548 }
4549
4550 static int dock_write(char *buf)
4551 {
4552         char *cmd;
4553
4554         if (!dock_docked())
4555                 return -ENODEV;
4556
4557         while ((cmd = next_cmd(&buf))) {
4558                 if (strlencmp(cmd, "undock") == 0) {
4559                         if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 0) ||
4560                             !acpi_evalf(dock_handle, NULL, "_EJ0", "vd", 1))
4561                                 return -EIO;
4562                 } else if (strlencmp(cmd, "dock") == 0) {
4563                         if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 1))
4564                                 return -EIO;
4565                 } else
4566                         return -EINVAL;
4567         }
4568
4569         return 0;
4570 }
4571
4572 #endif /* CONFIG_THINKPAD_ACPI_DOCK */
4573
4574 /*************************************************************************
4575  * Bay subdriver
4576  */
4577
4578 #ifdef CONFIG_THINKPAD_ACPI_BAY
4579
4580 TPACPI_HANDLE(bay, root, "\\_SB.PCI.IDE.SECN.MAST",     /* 570 */
4581            "\\_SB.PCI0.IDE0.IDES.IDSM", /* 600e/x, 770e, 770x */
4582            "\\_SB.PCI0.SATA.SCND.MSTR", /* T60, X60, Z60 */
4583            "\\_SB.PCI0.IDE0.SCND.MSTR", /* all others */
4584            );                           /* A21e, R30, R31 */
4585 TPACPI_HANDLE(bay_ej, bay, "_EJ3",      /* 600e/x, A2xm/p, A3x */
4586            "_EJ0",              /* all others */
4587            );                   /* 570,A21e,G4x,R30,R31,R32,R40e,R50e */
4588 TPACPI_HANDLE(bay2, root, "\\_SB.PCI0.IDE0.PRIM.SLAV",  /* A3x, R32 */
4589            "\\_SB.PCI0.IDE0.IDEP.IDPS", /* 600e/x, 770e, 770x */
4590            );                           /* all others */
4591 TPACPI_HANDLE(bay2_ej, bay2, "_EJ3",    /* 600e/x, 770e, A3x */
4592            "_EJ0",                      /* 770x */
4593            );                           /* all others */
4594
4595 static int __init bay_init(struct ibm_init_struct *iibm)
4596 {
4597         vdbg_printk(TPACPI_DBG_INIT, "initializing bay subdriver\n");
4598
4599         TPACPI_ACPIHANDLE_INIT(bay);
4600         if (bay_handle)
4601                 TPACPI_ACPIHANDLE_INIT(bay_ej);
4602         TPACPI_ACPIHANDLE_INIT(bay2);
4603         if (bay2_handle)
4604                 TPACPI_ACPIHANDLE_INIT(bay2_ej);
4605
4606         tp_features.bay_status = bay_handle &&
4607                 acpi_evalf(bay_handle, NULL, "_STA", "qv");
4608         tp_features.bay_status2 = bay2_handle &&
4609                 acpi_evalf(bay2_handle, NULL, "_STA", "qv");
4610
4611         tp_features.bay_eject = bay_handle && bay_ej_handle &&
4612                 (strlencmp(bay_ej_path, "_EJ0") == 0 || experimental);
4613         tp_features.bay_eject2 = bay2_handle && bay2_ej_handle &&
4614                 (strlencmp(bay2_ej_path, "_EJ0") == 0 || experimental);
4615
4616         vdbg_printk(TPACPI_DBG_INIT,
4617                 "bay 1: status %s, eject %s; bay 2: status %s, eject %s\n",
4618                 str_supported(tp_features.bay_status),
4619                 str_supported(tp_features.bay_eject),
4620                 str_supported(tp_features.bay_status2),
4621                 str_supported(tp_features.bay_eject2));
4622
4623         return (tp_features.bay_status || tp_features.bay_eject ||
4624                 tp_features.bay_status2 || tp_features.bay_eject2)? 0 : 1;
4625 }
4626
4627 static void bay_notify(struct ibm_struct *ibm, u32 event)
4628 {
4629         acpi_bus_generate_proc_event(ibm->acpi->device, event, 0);
4630         acpi_bus_generate_netlink_event(ibm->acpi->device->pnp.device_class,
4631                                           dev_name(&ibm->acpi->device->dev),
4632                                           event, 0);
4633 }
4634
4635 #define bay_occupied(b) (_sta(b##_handle) & 1)
4636
4637 static int bay_read(char *p)
4638 {
4639         int len = 0;
4640         int occupied = bay_occupied(bay);
4641         int occupied2 = bay_occupied(bay2);
4642         int eject, eject2;
4643
4644         len += sprintf(p + len, "status:\t\t%s\n",
4645                 tp_features.bay_status ?
4646                         (occupied ? "occupied" : "unoccupied") :
4647                                 "not supported");
4648         if (tp_features.bay_status2)
4649                 len += sprintf(p + len, "status2:\t%s\n", occupied2 ?
4650                                "occupied" : "unoccupied");
4651
4652         eject = tp_features.bay_eject && occupied;
4653         eject2 = tp_features.bay_eject2 && occupied2;
4654
4655         if (eject && eject2)
4656                 len += sprintf(p + len, "commands:\teject, eject2\n");
4657         else if (eject)
4658                 len += sprintf(p + len, "commands:\teject\n");
4659         else if (eject2)
4660                 len += sprintf(p + len, "commands:\teject2\n");
4661
4662         return len;
4663 }
4664
4665 static int bay_write(char *buf)
4666 {
4667         char *cmd;
4668
4669         if (!tp_features.bay_eject && !tp_features.bay_eject2)
4670                 return -ENODEV;
4671
4672         while ((cmd = next_cmd(&buf))) {
4673                 if (tp_features.bay_eject && strlencmp(cmd, "eject") == 0) {
4674                         if (!acpi_evalf(bay_ej_handle, NULL, NULL, "vd", 1))
4675                                 return -EIO;
4676                 } else if (tp_features.bay_eject2 &&
4677                            strlencmp(cmd, "eject2") == 0) {
4678                         if (!acpi_evalf(bay2_ej_handle, NULL, NULL, "vd", 1))
4679                                 return -EIO;
4680                 } else
4681                         return -EINVAL;
4682         }
4683
4684         return 0;
4685 }
4686
4687 static struct tp_acpi_drv_struct ibm_bay_acpidriver = {
4688         .notify = bay_notify,
4689         .handle = &bay_handle,
4690         .type = ACPI_SYSTEM_NOTIFY,
4691 };
4692
4693 static struct ibm_struct bay_driver_data = {
4694         .name = "bay",
4695         .read = bay_read,
4696         .write = bay_write,
4697         .acpi = &ibm_bay_acpidriver,
4698 };
4699
4700 #endif /* CONFIG_THINKPAD_ACPI_BAY */
4701
4702 /*************************************************************************
4703  * CMOS subdriver
4704  */
4705
4706 /* sysfs cmos_command -------------------------------------------------- */
4707 static ssize_t cmos_command_store(struct device *dev,
4708                             struct device_attribute *attr,
4709                             const char *buf, size_t count)
4710 {
4711         unsigned long cmos_cmd;
4712         int res;
4713
4714         if (parse_strtoul(buf, 21, &cmos_cmd))
4715                 return -EINVAL;
4716
4717         res = issue_thinkpad_cmos_command(cmos_cmd);
4718         return (res)? res : count;
4719 }
4720
4721 static struct device_attribute dev_attr_cmos_command =
4722         __ATTR(cmos_command, S_IWUSR, NULL, cmos_command_store);
4723
4724 /* --------------------------------------------------------------------- */
4725
4726 static int __init cmos_init(struct ibm_init_struct *iibm)
4727 {
4728         int res;
4729
4730         vdbg_printk(TPACPI_DBG_INIT,
4731                 "initializing cmos commands subdriver\n");
4732
4733         TPACPI_ACPIHANDLE_INIT(cmos);
4734
4735         vdbg_printk(TPACPI_DBG_INIT, "cmos commands are %s\n",
4736                 str_supported(cmos_handle != NULL));
4737
4738         res = device_create_file(&tpacpi_pdev->dev, &dev_attr_cmos_command);
4739         if (res)
4740                 return res;
4741
4742         return (cmos_handle)? 0 : 1;
4743 }
4744
4745 static void cmos_exit(void)
4746 {
4747         device_remove_file(&tpacpi_pdev->dev, &dev_attr_cmos_command);
4748 }
4749
4750 static int cmos_read(char *p)
4751 {
4752         int len = 0;
4753
4754         /* cmos not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
4755            R30, R31, T20-22, X20-21 */
4756         if (!cmos_handle)
4757                 len += sprintf(p + len, "status:\t\tnot supported\n");
4758         else {
4759                 len += sprintf(p + len, "status:\t\tsupported\n");
4760                 len += sprintf(p + len, "commands:\t<cmd> (<cmd> is 0-21)\n");
4761         }
4762
4763         return len;
4764 }
4765
4766 static int cmos_write(char *buf)
4767 {
4768         char *cmd;
4769         int cmos_cmd, res;
4770
4771         while ((cmd = next_cmd(&buf))) {
4772                 if (sscanf(cmd, "%u", &cmos_cmd) == 1 &&
4773                     cmos_cmd >= 0 && cmos_cmd <= 21) {
4774                         /* cmos_cmd set */
4775                 } else
4776                         return -EINVAL;
4777
4778                 res = issue_thinkpad_cmos_command(cmos_cmd);
4779                 if (res)
4780                         return res;
4781         }
4782
4783         return 0;
4784 }
4785
4786 static struct ibm_struct cmos_driver_data = {
4787         .name = "cmos",
4788         .read = cmos_read,
4789         .write = cmos_write,
4790         .exit = cmos_exit,
4791 };
4792
4793 /*************************************************************************
4794  * LED subdriver
4795  */
4796
4797 enum led_access_mode {
4798         TPACPI_LED_NONE = 0,
4799         TPACPI_LED_570, /* 570 */
4800         TPACPI_LED_OLD, /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
4801         TPACPI_LED_NEW, /* all others */
4802 };
4803
4804 enum {  /* For TPACPI_LED_OLD */
4805         TPACPI_LED_EC_HLCL = 0x0c,      /* EC reg to get led to power on */
4806         TPACPI_LED_EC_HLBL = 0x0d,      /* EC reg to blink a lit led */
4807         TPACPI_LED_EC_HLMS = 0x0e,      /* EC reg to select led to command */
4808 };
4809
4810 static enum led_access_mode led_supported;
4811
4812 TPACPI_HANDLE(led, ec, "SLED",  /* 570 */
4813            "SYSL",              /* 600e/x, 770e, 770x, A21e, A2xm/p, */
4814                                 /* T20-22, X20-21 */
4815            "LED",               /* all others */
4816            );                   /* R30, R31 */
4817
4818 #define TPACPI_LED_NUMLEDS 16
4819 static struct tpacpi_led_classdev *tpacpi_leds;
4820 static enum led_status_t tpacpi_led_state_cache[TPACPI_LED_NUMLEDS];
4821 static const char * const tpacpi_led_names[TPACPI_LED_NUMLEDS] = {
4822         /* there's a limit of 19 chars + NULL before 2.6.26 */
4823         "tpacpi::power",
4824         "tpacpi:orange:batt",
4825         "tpacpi:green:batt",
4826         "tpacpi::dock_active",
4827         "tpacpi::bay_active",
4828         "tpacpi::dock_batt",
4829         "tpacpi::unknown_led",
4830         "tpacpi::standby",
4831         "tpacpi::dock_status1",
4832         "tpacpi::dock_status2",
4833         "tpacpi::unknown_led2",
4834         "tpacpi::unknown_led3",
4835         "tpacpi::thinkvantage",
4836 };
4837 #define TPACPI_SAFE_LEDS        0x1081U
4838
4839 static inline bool tpacpi_is_led_restricted(const unsigned int led)
4840 {
4841 #ifdef CONFIG_THINKPAD_ACPI_UNSAFE_LEDS
4842         return false;
4843 #else
4844         return (1U & (TPACPI_SAFE_LEDS >> led)) == 0;
4845 #endif
4846 }
4847
4848 static int led_get_status(const unsigned int led)
4849 {
4850         int status;
4851         enum led_status_t led_s;
4852
4853         switch (led_supported) {
4854         case TPACPI_LED_570:
4855                 if (!acpi_evalf(ec_handle,
4856                                 &status, "GLED", "dd", 1 << led))
4857                         return -EIO;
4858                 led_s = (status == 0)?
4859                                 TPACPI_LED_OFF :
4860                                 ((status == 1)?
4861                                         TPACPI_LED_ON :
4862                                         TPACPI_LED_BLINK);
4863                 tpacpi_led_state_cache[led] = led_s;
4864                 return led_s;
4865         default:
4866                 return -ENXIO;
4867         }
4868
4869         /* not reached */
4870 }
4871
4872 static int led_set_status(const unsigned int led,
4873                           const enum led_status_t ledstatus)
4874 {
4875         /* off, on, blink. Index is led_status_t */
4876         static const unsigned int led_sled_arg1[] = { 0, 1, 3 };
4877         static const unsigned int led_led_arg1[] = { 0, 0x80, 0xc0 };
4878
4879         int rc = 0;
4880
4881         switch (led_supported) {
4882         case TPACPI_LED_570:
4883                 /* 570 */
4884                 if (unlikely(led > 7))
4885                         return -EINVAL;
4886                 if (unlikely(tpacpi_is_led_restricted(led)))
4887                         return -EPERM;
4888                 if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
4889                                 (1 << led), led_sled_arg1[ledstatus]))
4890                         rc = -EIO;
4891                 break;
4892         case TPACPI_LED_OLD:
4893                 /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20 */
4894                 if (unlikely(led > 7))
4895                         return -EINVAL;
4896                 if (unlikely(tpacpi_is_led_restricted(led)))
4897                         return -EPERM;
4898                 rc = ec_write(TPACPI_LED_EC_HLMS, (1 << led));
4899                 if (rc >= 0)
4900                         rc = ec_write(TPACPI_LED_EC_HLBL,
4901                                       (ledstatus == TPACPI_LED_BLINK) << led);
4902                 if (rc >= 0)
4903                         rc = ec_write(TPACPI_LED_EC_HLCL,
4904                                       (ledstatus != TPACPI_LED_OFF) << led);
4905                 break;
4906         case TPACPI_LED_NEW:
4907                 /* all others */
4908                 if (unlikely(led >= TPACPI_LED_NUMLEDS))
4909                         return -EINVAL;
4910                 if (unlikely(tpacpi_is_led_restricted(led)))
4911                         return -EPERM;
4912                 if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
4913                                 led, led_led_arg1[ledstatus]))
4914                         rc = -EIO;
4915                 break;
4916         default:
4917                 rc = -ENXIO;
4918         }
4919
4920         if (!rc)
4921                 tpacpi_led_state_cache[led] = ledstatus;
4922
4923         return rc;
4924 }
4925
4926 static void led_set_status_worker(struct work_struct *work)
4927 {
4928         struct tpacpi_led_classdev *data =
4929                 container_of(work, struct tpacpi_led_classdev, work);
4930
4931         if (likely(tpacpi_lifecycle == TPACPI_LIFE_RUNNING))
4932                 led_set_status(data->led, data->new_state);
4933 }
4934
4935 static void led_sysfs_set(struct led_classdev *led_cdev,
4936                         enum led_brightness brightness)
4937 {
4938         struct tpacpi_led_classdev *data = container_of(led_cdev,
4939                              struct tpacpi_led_classdev, led_classdev);
4940
4941         if (brightness == LED_OFF)
4942                 data->new_state = TPACPI_LED_OFF;
4943         else if (tpacpi_led_state_cache[data->led] != TPACPI_LED_BLINK)
4944                 data->new_state = TPACPI_LED_ON;
4945         else
4946                 data->new_state = TPACPI_LED_BLINK;
4947
4948         queue_work(tpacpi_wq, &data->work);
4949 }
4950
4951 static int led_sysfs_blink_set(struct led_classdev *led_cdev,
4952                         unsigned long *delay_on, unsigned long *delay_off)
4953 {
4954         struct tpacpi_led_classdev *data = container_of(led_cdev,
4955                              struct tpacpi_led_classdev, led_classdev);
4956
4957         /* Can we choose the flash rate? */
4958         if (*delay_on == 0 && *delay_off == 0) {
4959                 /* yes. set them to the hardware blink rate (1 Hz) */
4960                 *delay_on = 500; /* ms */
4961                 *delay_off = 500; /* ms */
4962         } else if ((*delay_on != 500) || (*delay_off != 500))
4963                 return -EINVAL;
4964
4965         data->new_state = TPACPI_LED_BLINK;
4966         queue_work(tpacpi_wq, &data->work);
4967
4968         return 0;
4969 }
4970
4971 static enum led_brightness led_sysfs_get(struct led_classdev *led_cdev)
4972 {
4973         int rc;
4974
4975         struct tpacpi_led_classdev *data = container_of(led_cdev,
4976                              struct tpacpi_led_classdev, led_classdev);
4977
4978         rc = led_get_status(data->led);
4979
4980         if (rc == TPACPI_LED_OFF || rc < 0)
4981                 rc = LED_OFF;   /* no error handling in led class :( */
4982         else
4983                 rc = LED_FULL;
4984
4985         return rc;
4986 }
4987
4988 static void led_exit(void)
4989 {
4990         unsigned int i;
4991
4992         for (i = 0; i < TPACPI_LED_NUMLEDS; i++) {
4993                 if (tpacpi_leds[i].led_classdev.name)
4994                         led_classdev_unregister(&tpacpi_leds[i].led_classdev);
4995         }
4996
4997         kfree(tpacpi_leds);
4998 }
4999
5000 static int __init tpacpi_init_led(unsigned int led)
5001 {
5002         int rc;
5003
5004         tpacpi_leds[led].led = led;
5005
5006         /* LEDs with no name don't get registered */
5007         if (!tpacpi_led_names[led])
5008                 return 0;
5009
5010         tpacpi_leds[led].led_classdev.brightness_set = &led_sysfs_set;
5011         tpacpi_leds[led].led_classdev.blink_set = &led_sysfs_blink_set;
5012         if (led_supported == TPACPI_LED_570)
5013                 tpacpi_leds[led].led_classdev.brightness_get =
5014                                                 &led_sysfs_get;
5015
5016         tpacpi_leds[led].led_classdev.name = tpacpi_led_names[led];
5017
5018         INIT_WORK(&tpacpi_leds[led].work, led_set_status_worker);
5019
5020         rc = led_classdev_register(&tpacpi_pdev->dev,
5021                                 &tpacpi_leds[led].led_classdev);
5022         if (rc < 0)
5023                 tpacpi_leds[led].led_classdev.name = NULL;
5024
5025         return rc;
5026 }
5027
5028 static const struct tpacpi_quirk led_useful_qtable[] __initconst = {
5029         TPACPI_Q_IBM('1', 'E', 0x009f), /* A30 */
5030         TPACPI_Q_IBM('1', 'N', 0x009f), /* A31 */
5031         TPACPI_Q_IBM('1', 'G', 0x009f), /* A31 */
5032
5033         TPACPI_Q_IBM('1', 'I', 0x0097), /* T30 */
5034         TPACPI_Q_IBM('1', 'R', 0x0097), /* T40, T41, T42, R50, R51 */
5035         TPACPI_Q_IBM('7', '0', 0x0097), /* T43, R52 */
5036         TPACPI_Q_IBM('1', 'Y', 0x0097), /* T43 */
5037         TPACPI_Q_IBM('1', 'W', 0x0097), /* R50e */
5038         TPACPI_Q_IBM('1', 'V', 0x0097), /* R51 */
5039         TPACPI_Q_IBM('7', '8', 0x0097), /* R51e */
5040         TPACPI_Q_IBM('7', '6', 0x0097), /* R52 */
5041
5042         TPACPI_Q_IBM('1', 'K', 0x00bf), /* X30 */
5043         TPACPI_Q_IBM('1', 'Q', 0x00bf), /* X31, X32 */
5044         TPACPI_Q_IBM('1', 'U', 0x00bf), /* X40 */
5045         TPACPI_Q_IBM('7', '4', 0x00bf), /* X41 */
5046         TPACPI_Q_IBM('7', '5', 0x00bf), /* X41t */
5047
5048         TPACPI_Q_IBM('7', '9', 0x1f97), /* T60 (1) */
5049         TPACPI_Q_IBM('7', '7', 0x1f97), /* Z60* (1) */
5050         TPACPI_Q_IBM('7', 'F', 0x1f97), /* Z61* (1) */
5051         TPACPI_Q_IBM('7', 'B', 0x1fb7), /* X60 (1) */
5052
5053         /* (1) - may have excess leds enabled on MSB */
5054
5055         /* Defaults (order matters, keep last, don't reorder!) */
5056         { /* Lenovo */
5057           .vendor = PCI_VENDOR_ID_LENOVO,
5058           .bios = TPACPI_MATCH_ANY, .ec = TPACPI_MATCH_ANY,
5059           .quirks = 0x1fffU,
5060         },
5061         { /* IBM ThinkPads with no EC version string */
5062           .vendor = PCI_VENDOR_ID_IBM,
5063           .bios = TPACPI_MATCH_ANY, .ec = TPACPI_MATCH_UNKNOWN,
5064           .quirks = 0x00ffU,
5065         },
5066         { /* IBM ThinkPads with EC version string */
5067           .vendor = PCI_VENDOR_ID_IBM,
5068           .bios = TPACPI_MATCH_ANY, .ec = TPACPI_MATCH_ANY,
5069           .quirks = 0x00bfU,
5070         },
5071 };
5072
5073 #undef TPACPI_LEDQ_IBM
5074 #undef TPACPI_LEDQ_LNV
5075
5076 static int __init led_init(struct ibm_init_struct *iibm)
5077 {
5078         unsigned int i;
5079         int rc;
5080         unsigned long useful_leds;
5081
5082         vdbg_printk(TPACPI_DBG_INIT, "initializing LED subdriver\n");
5083
5084         TPACPI_ACPIHANDLE_INIT(led);
5085
5086         if (!led_handle)
5087                 /* led not supported on R30, R31 */
5088                 led_supported = TPACPI_LED_NONE;
5089         else if (strlencmp(led_path, "SLED") == 0)
5090                 /* 570 */
5091                 led_supported = TPACPI_LED_570;
5092         else if (strlencmp(led_path, "SYSL") == 0)
5093                 /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
5094                 led_supported = TPACPI_LED_OLD;
5095         else
5096                 /* all others */
5097                 led_supported = TPACPI_LED_NEW;
5098
5099         vdbg_printk(TPACPI_DBG_INIT, "LED commands are %s, mode %d\n",
5100                 str_supported(led_supported), led_supported);
5101
5102         if (led_supported == TPACPI_LED_NONE)
5103                 return 1;
5104
5105         tpacpi_leds = kzalloc(sizeof(*tpacpi_leds) * TPACPI_LED_NUMLEDS,
5106                               GFP_KERNEL);
5107         if (!tpacpi_leds) {
5108                 printk(TPACPI_ERR "Out of memory for LED data\n");
5109                 return -ENOMEM;
5110         }
5111
5112         useful_leds = tpacpi_check_quirks(led_useful_qtable,
5113                                           ARRAY_SIZE(led_useful_qtable));
5114
5115         for (i = 0; i < TPACPI_LED_NUMLEDS; i++) {
5116                 if (!tpacpi_is_led_restricted(i) &&
5117                     test_bit(i, &useful_leds)) {
5118                         rc = tpacpi_init_led(i);
5119                         if (rc < 0) {
5120                                 led_exit();
5121                                 return rc;
5122                         }
5123                 }
5124         }
5125
5126 #ifdef CONFIG_THINKPAD_ACPI_UNSAFE_LEDS
5127         printk(TPACPI_NOTICE
5128                 "warning: userspace override of important "
5129                 "firmware LEDs is enabled\n");
5130 #endif
5131         return 0;
5132 }
5133
5134 #define str_led_status(s) \
5135         ((s) == TPACPI_LED_OFF ? "off" : \
5136                 ((s) == TPACPI_LED_ON ? "on" : "blinking"))
5137
5138 static int led_read(char *p)
5139 {
5140         int len = 0;
5141
5142         if (!led_supported) {
5143                 len += sprintf(p + len, "status:\t\tnot supported\n");
5144                 return len;
5145         }
5146         len += sprintf(p + len, "status:\t\tsupported\n");
5147
5148         if (led_supported == TPACPI_LED_570) {
5149                 /* 570 */
5150                 int i, status;
5151                 for (i = 0; i < 8; i++) {
5152                         status = led_get_status(i);
5153                         if (status < 0)
5154                                 return -EIO;
5155                         len += sprintf(p + len, "%d:\t\t%s\n",
5156                                        i, str_led_status(status));
5157                 }
5158         }
5159
5160         len += sprintf(p + len, "commands:\t"
5161                        "<led> on, <led> off, <led> blink (<led> is 0-15)\n");
5162
5163         return len;
5164 }
5165
5166 static int led_write(char *buf)
5167 {
5168         char *cmd;
5169         int led, rc;
5170         enum led_status_t s;
5171
5172         if (!led_supported)
5173                 return -ENODEV;
5174
5175         while ((cmd = next_cmd(&buf))) {
5176                 if (sscanf(cmd, "%d", &led) != 1 || led < 0 || led > 15)
5177                         return -EINVAL;
5178
5179                 if (strstr(cmd, "off")) {
5180                         s = TPACPI_LED_OFF;
5181                 } else if (strstr(cmd, "on")) {
5182                         s = TPACPI_LED_ON;
5183                 } else if (strstr(cmd, "blink")) {
5184                         s = TPACPI_LED_BLINK;
5185                 } else {
5186                         return -EINVAL;
5187                 }
5188
5189                 rc = led_set_status(led, s);
5190                 if (rc < 0)
5191                         return rc;
5192         }
5193
5194         return 0;
5195 }
5196
5197 static struct ibm_struct led_driver_data = {
5198         .name = "led",
5199         .read = led_read,
5200         .write = led_write,
5201         .exit = led_exit,
5202 };
5203
5204 /*************************************************************************
5205  * Beep subdriver
5206  */
5207
5208 TPACPI_HANDLE(beep, ec, "BEEP");        /* all except R30, R31 */
5209
5210 #define TPACPI_BEEP_Q1 0x0001
5211
5212 static const struct tpacpi_quirk beep_quirk_table[] __initconst = {
5213         TPACPI_Q_IBM('I', 'M', TPACPI_BEEP_Q1), /* 570 */
5214         TPACPI_Q_IBM('I', 'U', TPACPI_BEEP_Q1), /* 570E - unverified */
5215 };
5216
5217 static int __init beep_init(struct ibm_init_struct *iibm)
5218 {
5219         unsigned long quirks;
5220
5221         vdbg_printk(TPACPI_DBG_INIT, "initializing beep subdriver\n");
5222
5223         TPACPI_ACPIHANDLE_INIT(beep);
5224
5225         vdbg_printk(TPACPI_DBG_INIT, "beep is %s\n",
5226                 str_supported(beep_handle != NULL));
5227
5228         quirks = tpacpi_check_quirks(beep_quirk_table,
5229                                      ARRAY_SIZE(beep_quirk_table));
5230
5231         tp_features.beep_needs_two_args = !!(quirks & TPACPI_BEEP_Q1);
5232
5233         return (beep_handle)? 0 : 1;
5234 }
5235
5236 static int beep_read(char *p)
5237 {
5238         int len = 0;
5239
5240         if (!beep_handle)
5241                 len += sprintf(p + len, "status:\t\tnot supported\n");
5242         else {
5243                 len += sprintf(p + len, "status:\t\tsupported\n");
5244                 len += sprintf(p + len, "commands:\t<cmd> (<cmd> is 0-17)\n");
5245         }
5246
5247         return len;
5248 }
5249
5250 static int beep_write(char *buf)
5251 {
5252         char *cmd;
5253         int beep_cmd;
5254
5255         if (!beep_handle)
5256                 return -ENODEV;
5257
5258         while ((cmd = next_cmd(&buf))) {
5259                 if (sscanf(cmd, "%u", &beep_cmd) == 1 &&
5260                     beep_cmd >= 0 && beep_cmd <= 17) {
5261                         /* beep_cmd set */
5262                 } else
5263                         return -EINVAL;
5264                 if (tp_features.beep_needs_two_args) {
5265                         if (!acpi_evalf(beep_handle, NULL, NULL, "vdd",
5266                                         beep_cmd, 0))
5267                                 return -EIO;
5268                 } else {
5269                         if (!acpi_evalf(beep_handle, NULL, NULL, "vd",
5270                                         beep_cmd))
5271                                 return -EIO;
5272                 }
5273         }
5274
5275         return 0;
5276 }
5277
5278 static struct ibm_struct beep_driver_data = {
5279         .name = "beep",
5280         .read = beep_read,
5281         .write = beep_write,
5282 };
5283
5284 /*************************************************************************
5285  * Thermal subdriver
5286  */
5287
5288 enum thermal_access_mode {
5289         TPACPI_THERMAL_NONE = 0,        /* No thermal support */
5290         TPACPI_THERMAL_ACPI_TMP07,      /* Use ACPI TMP0-7 */
5291         TPACPI_THERMAL_ACPI_UPDT,       /* Use ACPI TMP0-7 with UPDT */
5292         TPACPI_THERMAL_TPEC_8,          /* Use ACPI EC regs, 8 sensors */
5293         TPACPI_THERMAL_TPEC_16,         /* Use ACPI EC regs, 16 sensors */
5294 };
5295
5296 enum { /* TPACPI_THERMAL_TPEC_* */
5297         TP_EC_THERMAL_TMP0 = 0x78,      /* ACPI EC regs TMP 0..7 */
5298         TP_EC_THERMAL_TMP8 = 0xC0,      /* ACPI EC regs TMP 8..15 */
5299         TP_EC_THERMAL_TMP_NA = -128,    /* ACPI EC sensor not available */
5300 };
5301
5302 #define TPACPI_MAX_THERMAL_SENSORS 16   /* Max thermal sensors supported */
5303 struct ibm_thermal_sensors_struct {
5304         s32 temp[TPACPI_MAX_THERMAL_SENSORS];
5305 };
5306
5307 static enum thermal_access_mode thermal_read_mode;
5308
5309 /* idx is zero-based */
5310 static int thermal_get_sensor(int idx, s32 *value)
5311 {
5312         int t;
5313         s8 tmp;
5314         char tmpi[5];
5315
5316         t = TP_EC_THERMAL_TMP0;
5317
5318         switch (thermal_read_mode) {
5319 #if TPACPI_MAX_THERMAL_SENSORS >= 16
5320         case TPACPI_THERMAL_TPEC_16:
5321                 if (idx >= 8 && idx <= 15) {
5322                         t = TP_EC_THERMAL_TMP8;
5323                         idx -= 8;
5324                 }
5325                 /* fallthrough */
5326 #endif
5327         case TPACPI_THERMAL_TPEC_8:
5328                 if (idx <= 7) {
5329                         if (!acpi_ec_read(t + idx, &tmp))
5330                                 return -EIO;
5331                         *value = tmp * 1000;
5332                         return 0;
5333                 }
5334                 break;
5335
5336         case TPACPI_THERMAL_ACPI_UPDT:
5337                 if (idx <= 7) {
5338                         snprintf(tmpi, sizeof(tmpi), "TMP%c", '0' + idx);
5339                         if (!acpi_evalf(ec_handle, NULL, "UPDT", "v"))
5340                                 return -EIO;
5341                         if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
5342                                 return -EIO;
5343                         *value = (t - 2732) * 100;
5344                         return 0;
5345                 }
5346                 break;
5347
5348         case TPACPI_THERMAL_ACPI_TMP07:
5349                 if (idx <= 7) {
5350                         snprintf(tmpi, sizeof(tmpi), "TMP%c", '0' + idx);
5351                         if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
5352                                 return -EIO;
5353                         if (t > 127 || t < -127)
5354                                 t = TP_EC_THERMAL_TMP_NA;
5355                         *value = t * 1000;
5356                         return 0;
5357                 }
5358                 break;
5359
5360         case TPACPI_THERMAL_NONE:
5361         default:
5362                 return -ENOSYS;
5363         }
5364
5365         return -EINVAL;
5366 }
5367
5368 static int thermal_get_sensors(struct ibm_thermal_sensors_struct *s)
5369 {
5370         int res, i;
5371         int n;
5372
5373         n = 8;
5374         i = 0;
5375
5376         if (!s)
5377                 return -EINVAL;
5378
5379         if (thermal_read_mode == TPACPI_THERMAL_TPEC_16)
5380                 n = 16;
5381
5382         for (i = 0 ; i < n; i++) {
5383                 res = thermal_get_sensor(i, &s->temp[i]);
5384                 if (res)
5385                         return res;
5386         }
5387
5388         return n;
5389 }
5390
5391 /* sysfs temp##_input -------------------------------------------------- */
5392
5393 static ssize_t thermal_temp_input_show(struct device *dev,
5394                            struct device_attribute *attr,
5395                            char *buf)
5396 {
5397         struct sensor_device_attribute *sensor_attr =
5398                                         to_sensor_dev_attr(attr);
5399         int idx = sensor_attr->index;
5400         s32 value;
5401         int res;
5402
5403         res = thermal_get_sensor(idx, &value);
5404         if (res)
5405                 return res;
5406         if (value == TP_EC_THERMAL_TMP_NA * 1000)
5407                 return -ENXIO;
5408
5409         return snprintf(buf, PAGE_SIZE, "%d\n", value);
5410 }
5411
5412 #define THERMAL_SENSOR_ATTR_TEMP(_idxA, _idxB) \
5413          SENSOR_ATTR(temp##_idxA##_input, S_IRUGO, \
5414                      thermal_temp_input_show, NULL, _idxB)
5415
5416 static struct sensor_device_attribute sensor_dev_attr_thermal_temp_input[] = {
5417         THERMAL_SENSOR_ATTR_TEMP(1, 0),
5418         THERMAL_SENSOR_ATTR_TEMP(2, 1),
5419         THERMAL_SENSOR_ATTR_TEMP(3, 2),
5420         THERMAL_SENSOR_ATTR_TEMP(4, 3),
5421         THERMAL_SENSOR_ATTR_TEMP(5, 4),
5422         THERMAL_SENSOR_ATTR_TEMP(6, 5),
5423         THERMAL_SENSOR_ATTR_TEMP(7, 6),
5424         THERMAL_SENSOR_ATTR_TEMP(8, 7),
5425         THERMAL_SENSOR_ATTR_TEMP(9, 8),
5426         THERMAL_SENSOR_ATTR_TEMP(10, 9),
5427         THERMAL_SENSOR_ATTR_TEMP(11, 10),
5428         THERMAL_SENSOR_ATTR_TEMP(12, 11),
5429         THERMAL_SENSOR_ATTR_TEMP(13, 12),
5430         THERMAL_SENSOR_ATTR_TEMP(14, 13),
5431         THERMAL_SENSOR_ATTR_TEMP(15, 14),
5432         THERMAL_SENSOR_ATTR_TEMP(16, 15),
5433 };
5434
5435 #define THERMAL_ATTRS(X) \
5436         &sensor_dev_attr_thermal_temp_input[X].dev_attr.attr
5437
5438 static struct attribute *thermal_temp_input_attr[] = {
5439         THERMAL_ATTRS(8),
5440         THERMAL_ATTRS(9),
5441         THERMAL_ATTRS(10),
5442         THERMAL_ATTRS(11),
5443         THERMAL_ATTRS(12),
5444         THERMAL_ATTRS(13),
5445         THERMAL_ATTRS(14),
5446         THERMAL_ATTRS(15),
5447         THERMAL_ATTRS(0),
5448         THERMAL_ATTRS(1),
5449         THERMAL_ATTRS(2),
5450         THERMAL_ATTRS(3),
5451         THERMAL_ATTRS(4),
5452         THERMAL_ATTRS(5),
5453         THERMAL_ATTRS(6),
5454         THERMAL_ATTRS(7),
5455         NULL
5456 };
5457
5458 static const struct attribute_group thermal_temp_input16_group = {
5459         .attrs = thermal_temp_input_attr
5460 };
5461
5462 static const struct attribute_group thermal_temp_input8_group = {
5463         .attrs = &thermal_temp_input_attr[8]
5464 };
5465
5466 #undef THERMAL_SENSOR_ATTR_TEMP
5467 #undef THERMAL_ATTRS
5468
5469 /* --------------------------------------------------------------------- */
5470
5471 static int __init thermal_init(struct ibm_init_struct *iibm)
5472 {
5473         u8 t, ta1, ta2;
5474         int i;
5475         int acpi_tmp7;
5476         int res;
5477
5478         vdbg_printk(TPACPI_DBG_INIT, "initializing thermal subdriver\n");
5479
5480         acpi_tmp7 = acpi_evalf(ec_handle, NULL, "TMP7", "qv");
5481
5482         if (thinkpad_id.ec_model) {
5483                 /*
5484                  * Direct EC access mode: sensors at registers
5485                  * 0x78-0x7F, 0xC0-0xC7.  Registers return 0x00 for
5486                  * non-implemented, thermal sensors return 0x80 when
5487                  * not available
5488                  */
5489
5490                 ta1 = ta2 = 0;
5491                 for (i = 0; i < 8; i++) {
5492                         if (acpi_ec_read(TP_EC_THERMAL_TMP0 + i, &t)) {
5493                                 ta1 |= t;
5494                         } else {
5495                                 ta1 = 0;
5496                                 break;
5497                         }
5498                         if (acpi_ec_read(TP_EC_THERMAL_TMP8 + i, &t)) {
5499                                 ta2 |= t;
5500                         } else {
5501                                 ta1 = 0;
5502                                 break;
5503                         }
5504                 }
5505                 if (ta1 == 0) {
5506                         /* This is sheer paranoia, but we handle it anyway */
5507                         if (acpi_tmp7) {
5508                                 printk(TPACPI_ERR
5509                                        "ThinkPad ACPI EC access misbehaving, "
5510                                        "falling back to ACPI TMPx access "
5511                                        "mode\n");
5512                                 thermal_read_mode = TPACPI_THERMAL_ACPI_TMP07;
5513                         } else {
5514                                 printk(TPACPI_ERR
5515                                        "ThinkPad ACPI EC access misbehaving, "
5516                                        "disabling thermal sensors access\n");
5517                                 thermal_read_mode = TPACPI_THERMAL_NONE;
5518                         }
5519                 } else {
5520                         thermal_read_mode =
5521                             (ta2 != 0) ?
5522                             TPACPI_THERMAL_TPEC_16 : TPACPI_THERMAL_TPEC_8;
5523                 }
5524         } else if (acpi_tmp7) {
5525                 if (acpi_evalf(ec_handle, NULL, "UPDT", "qv")) {
5526                         /* 600e/x, 770e, 770x */
5527                         thermal_read_mode = TPACPI_THERMAL_ACPI_UPDT;
5528                 } else {
5529                         /* Standard ACPI TMPx access, max 8 sensors */
5530                         thermal_read_mode = TPACPI_THERMAL_ACPI_TMP07;
5531                 }
5532         } else {
5533                 /* temperatures not supported on 570, G4x, R30, R31, R32 */
5534                 thermal_read_mode = TPACPI_THERMAL_NONE;
5535         }
5536
5537         vdbg_printk(TPACPI_DBG_INIT, "thermal is %s, mode %d\n",
5538                 str_supported(thermal_read_mode != TPACPI_THERMAL_NONE),
5539                 thermal_read_mode);
5540
5541         switch (thermal_read_mode) {
5542         case TPACPI_THERMAL_TPEC_16:
5543                 res = sysfs_create_group(&tpacpi_sensors_pdev->dev.kobj,
5544                                 &thermal_temp_input16_group);
5545                 if (res)
5546                         return res;
5547                 break;
5548         case TPACPI_THERMAL_TPEC_8:
5549         case TPACPI_THERMAL_ACPI_TMP07:
5550         case TPACPI_THERMAL_ACPI_UPDT:
5551                 res = sysfs_create_group(&tpacpi_sensors_pdev->dev.kobj,
5552                                 &thermal_temp_input8_group);
5553                 if (res)
5554                         return res;
5555                 break;
5556         case TPACPI_THERMAL_NONE:
5557         default:
5558                 return 1;
5559         }
5560
5561         return 0;
5562 }
5563
5564 static void thermal_exit(void)
5565 {
5566         switch (thermal_read_mode) {
5567         case TPACPI_THERMAL_TPEC_16:
5568                 sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj,
5569                                    &thermal_temp_input16_group);
5570                 break;
5571         case TPACPI_THERMAL_TPEC_8:
5572         case TPACPI_THERMAL_ACPI_TMP07:
5573         case TPACPI_THERMAL_ACPI_UPDT:
5574                 sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj,
5575                                    &thermal_temp_input16_group);
5576                 break;
5577         case TPACPI_THERMAL_NONE:
5578         default:
5579                 break;
5580         }
5581 }
5582
5583 static int thermal_read(char *p)
5584 {
5585         int len = 0;
5586         int n, i;
5587         struct ibm_thermal_sensors_struct t;
5588
5589         n = thermal_get_sensors(&t);
5590         if (unlikely(n < 0))
5591                 return n;
5592
5593         len += sprintf(p + len, "temperatures:\t");
5594
5595         if (n > 0) {
5596                 for (i = 0; i < (n - 1); i++)
5597                         len += sprintf(p + len, "%d ", t.temp[i] / 1000);
5598                 len += sprintf(p + len, "%d\n", t.temp[i] / 1000);
5599         } else
5600                 len += sprintf(p + len, "not supported\n");
5601
5602         return len;
5603 }
5604
5605 static struct ibm_struct thermal_driver_data = {
5606         .name = "thermal",
5607         .read = thermal_read,
5608         .exit = thermal_exit,
5609 };
5610
5611 /*************************************************************************
5612  * EC Dump subdriver
5613  */
5614
5615 static u8 ecdump_regs[256];
5616
5617 static int ecdump_read(char *p)
5618 {
5619         int len = 0;
5620         int i, j;
5621         u8 v;
5622
5623         len += sprintf(p + len, "EC      "
5624                        " +00 +01 +02 +03 +04 +05 +06 +07"
5625                        " +08 +09 +0a +0b +0c +0d +0e +0f\n");
5626         for (i = 0; i < 256; i += 16) {
5627                 len += sprintf(p + len, "EC 0x%02x:", i);
5628                 for (j = 0; j < 16; j++) {
5629                         if (!acpi_ec_read(i + j, &v))
5630                                 break;
5631                         if (v != ecdump_regs[i + j])
5632                                 len += sprintf(p + len, " *%02x", v);
5633                         else
5634                                 len += sprintf(p + len, "  %02x", v);
5635                         ecdump_regs[i + j] = v;
5636                 }
5637                 len += sprintf(p + len, "\n");
5638                 if (j != 16)
5639                         break;
5640         }
5641
5642         /* These are way too dangerous to advertise openly... */
5643 #if 0
5644         len += sprintf(p + len, "commands:\t0x<offset> 0x<value>"
5645                        " (<offset> is 00-ff, <value> is 00-ff)\n");
5646         len += sprintf(p + len, "commands:\t0x<offset> <value>  "
5647                        " (<offset> is 00-ff, <value> is 0-255)\n");
5648 #endif
5649         return len;
5650 }
5651
5652 static int ecdump_write(char *buf)
5653 {
5654         char *cmd;
5655         int i, v;
5656
5657         while ((cmd = next_cmd(&buf))) {
5658                 if (sscanf(cmd, "0x%x 0x%x", &i, &v) == 2) {
5659                         /* i and v set */
5660                 } else if (sscanf(cmd, "0x%x %u", &i, &v) == 2) {
5661                         /* i and v set */
5662                 } else
5663                         return -EINVAL;
5664                 if (i >= 0 && i < 256 && v >= 0 && v < 256) {
5665                         if (!acpi_ec_write(i, v))
5666                                 return -EIO;
5667                 } else
5668                         return -EINVAL;
5669         }
5670
5671         return 0;
5672 }
5673
5674 static struct ibm_struct ecdump_driver_data = {
5675         .name = "ecdump",
5676         .read = ecdump_read,
5677         .write = ecdump_write,
5678         .flags.experimental = 1,
5679 };
5680
5681 /*************************************************************************
5682  * Backlight/brightness subdriver
5683  */
5684
5685 #define TPACPI_BACKLIGHT_DEV_NAME "thinkpad_screen"
5686
5687 /*
5688  * ThinkPads can read brightness from two places: EC HBRV (0x31), or
5689  * CMOS NVRAM byte 0x5E, bits 0-3.
5690  *
5691  * EC HBRV (0x31) has the following layout
5692  *   Bit 7: unknown function
5693  *   Bit 6: unknown function
5694  *   Bit 5: Z: honour scale changes, NZ: ignore scale changes
5695  *   Bit 4: must be set to zero to avoid problems
5696  *   Bit 3-0: backlight brightness level
5697  *
5698  * brightness_get_raw returns status data in the HBRV layout
5699  */
5700
5701 enum {
5702         TP_EC_BACKLIGHT = 0x31,
5703
5704         /* TP_EC_BACKLIGHT bitmasks */
5705         TP_EC_BACKLIGHT_LVLMSK = 0x1F,
5706         TP_EC_BACKLIGHT_CMDMSK = 0xE0,
5707         TP_EC_BACKLIGHT_MAPSW = 0x20,
5708 };
5709
5710 enum tpacpi_brightness_access_mode {
5711         TPACPI_BRGHT_MODE_AUTO = 0,     /* Not implemented yet */
5712         TPACPI_BRGHT_MODE_EC,           /* EC control */
5713         TPACPI_BRGHT_MODE_UCMS_STEP,    /* UCMS step-based control */
5714         TPACPI_BRGHT_MODE_ECNVRAM,      /* EC control w/ NVRAM store */
5715         TPACPI_BRGHT_MODE_MAX
5716 };
5717
5718 static struct backlight_device *ibm_backlight_device;
5719
5720 static enum tpacpi_brightness_access_mode brightness_mode =
5721                 TPACPI_BRGHT_MODE_MAX;
5722
5723 static unsigned int brightness_enable = 2; /* 2 = auto, 0 = no, 1 = yes */
5724
5725 static struct mutex brightness_mutex;
5726
5727 /* NVRAM brightness access,
5728  * call with brightness_mutex held! */
5729 static unsigned int tpacpi_brightness_nvram_get(void)
5730 {
5731         u8 lnvram;
5732
5733         lnvram = (nvram_read_byte(TP_NVRAM_ADDR_BRIGHTNESS)
5734                   & TP_NVRAM_MASK_LEVEL_BRIGHTNESS)
5735                   >> TP_NVRAM_POS_LEVEL_BRIGHTNESS;
5736         lnvram &= (tp_features.bright_16levels) ? 0x0f : 0x07;
5737
5738         return lnvram;
5739 }
5740
5741 static void tpacpi_brightness_checkpoint_nvram(void)
5742 {
5743         u8 lec = 0;
5744         u8 b_nvram;
5745
5746         if (brightness_mode != TPACPI_BRGHT_MODE_ECNVRAM)
5747                 return;
5748
5749         vdbg_printk(TPACPI_DBG_BRGHT,
5750                 "trying to checkpoint backlight level to NVRAM...\n");
5751
5752         if (mutex_lock_killable(&brightness_mutex) < 0)
5753                 return;
5754
5755         if (unlikely(!acpi_ec_read(TP_EC_BACKLIGHT, &lec)))
5756                 goto unlock;
5757         lec &= TP_EC_BACKLIGHT_LVLMSK;
5758         b_nvram = nvram_read_byte(TP_NVRAM_ADDR_BRIGHTNESS);
5759
5760         if (lec != ((b_nvram & TP_NVRAM_MASK_LEVEL_BRIGHTNESS)
5761                              >> TP_NVRAM_POS_LEVEL_BRIGHTNESS)) {
5762                 /* NVRAM needs update */
5763                 b_nvram &= ~(TP_NVRAM_MASK_LEVEL_BRIGHTNESS <<
5764                                 TP_NVRAM_POS_LEVEL_BRIGHTNESS);
5765                 b_nvram |= lec;
5766                 nvram_write_byte(b_nvram, TP_NVRAM_ADDR_BRIGHTNESS);
5767                 dbg_printk(TPACPI_DBG_BRGHT,
5768                            "updated NVRAM backlight level to %u (0x%02x)\n",
5769                            (unsigned int) lec, (unsigned int) b_nvram);
5770         } else
5771                 vdbg_printk(TPACPI_DBG_BRGHT,
5772                            "NVRAM backlight level already is %u (0x%02x)\n",
5773                            (unsigned int) lec, (unsigned int) b_nvram);
5774
5775 unlock:
5776         mutex_unlock(&brightness_mutex);
5777 }
5778
5779
5780 /* call with brightness_mutex held! */
5781 static int tpacpi_brightness_get_raw(int *status)
5782 {
5783         u8 lec = 0;
5784
5785         switch (brightness_mode) {
5786         case TPACPI_BRGHT_MODE_UCMS_STEP:
5787                 *status = tpacpi_brightness_nvram_get();
5788                 return 0;
5789         case TPACPI_BRGHT_MODE_EC:
5790         case TPACPI_BRGHT_MODE_ECNVRAM:
5791                 if (unlikely(!acpi_ec_read(TP_EC_BACKLIGHT, &lec)))
5792                         return -EIO;
5793                 *status = lec;
5794                 return 0;
5795         default:
5796                 return -ENXIO;
5797         }
5798 }
5799
5800 /* call with brightness_mutex held! */
5801 /* do NOT call with illegal backlight level value */
5802 static int tpacpi_brightness_set_ec(unsigned int value)
5803 {
5804         u8 lec = 0;
5805
5806         if (unlikely(!acpi_ec_read(TP_EC_BACKLIGHT, &lec)))
5807                 return -EIO;
5808
5809         if (unlikely(!acpi_ec_write(TP_EC_BACKLIGHT,
5810                                 (lec & TP_EC_BACKLIGHT_CMDMSK) |
5811                                 (value & TP_EC_BACKLIGHT_LVLMSK))))
5812                 return -EIO;
5813
5814         return 0;
5815 }
5816
5817 /* call with brightness_mutex held! */
5818 static int tpacpi_brightness_set_ucmsstep(unsigned int value)
5819 {
5820         int cmos_cmd, inc;
5821         unsigned int current_value, i;
5822
5823         current_value = tpacpi_brightness_nvram_get();
5824
5825         if (value == current_value)
5826                 return 0;
5827
5828         cmos_cmd = (value > current_value) ?
5829                         TP_CMOS_BRIGHTNESS_UP :
5830                         TP_CMOS_BRIGHTNESS_DOWN;
5831         inc = (value > current_value) ? 1 : -1;
5832
5833         for (i = current_value; i != value; i += inc)
5834                 if (issue_thinkpad_cmos_command(cmos_cmd))
5835                         return -EIO;
5836
5837         return 0;
5838 }
5839
5840 /* May return EINTR which can always be mapped to ERESTARTSYS */
5841 static int brightness_set(unsigned int value)
5842 {
5843         int res;
5844
5845         if (value > ((tp_features.bright_16levels)? 15 : 7) ||
5846             value < 0)
5847                 return -EINVAL;
5848
5849         vdbg_printk(TPACPI_DBG_BRGHT,
5850                         "set backlight level to %d\n", value);
5851
5852         res = mutex_lock_killable(&brightness_mutex);
5853         if (res < 0)
5854                 return res;
5855
5856         switch (brightness_mode) {
5857         case TPACPI_BRGHT_MODE_EC:
5858         case TPACPI_BRGHT_MODE_ECNVRAM:
5859                 res = tpacpi_brightness_set_ec(value);
5860                 break;
5861         case TPACPI_BRGHT_MODE_UCMS_STEP:
5862                 res = tpacpi_brightness_set_ucmsstep(value);
5863                 break;
5864         default:
5865                 res = -ENXIO;
5866         }
5867
5868         mutex_unlock(&brightness_mutex);
5869         return res;
5870 }
5871
5872 /* sysfs backlight class ----------------------------------------------- */
5873
5874 static int brightness_update_status(struct backlight_device *bd)
5875 {
5876         unsigned int level =
5877                 (bd->props.fb_blank == FB_BLANK_UNBLANK &&
5878                  bd->props.power == FB_BLANK_UNBLANK) ?
5879                                 bd->props.brightness : 0;
5880
5881         dbg_printk(TPACPI_DBG_BRGHT,
5882                         "backlight: attempt to set level to %d\n",
5883                         level);
5884
5885         /* it is the backlight class's job (caller) to handle
5886          * EINTR and other errors properly */
5887         return brightness_set(level);
5888 }
5889
5890 static int brightness_get(struct backlight_device *bd)
5891 {
5892         int status, res;
5893
5894         res = mutex_lock_killable(&brightness_mutex);
5895         if (res < 0)
5896                 return 0;
5897
5898         res = tpacpi_brightness_get_raw(&status);
5899
5900         mutex_unlock(&brightness_mutex);
5901
5902         if (res < 0)
5903                 return 0;
5904
5905         return status & TP_EC_BACKLIGHT_LVLMSK;
5906 }
5907
5908 static struct backlight_ops ibm_backlight_data = {
5909         .get_brightness = brightness_get,
5910         .update_status  = brightness_update_status,
5911 };
5912
5913 /* --------------------------------------------------------------------- */
5914
5915 static int __init brightness_init(struct ibm_init_struct *iibm)
5916 {
5917         int b;
5918
5919         vdbg_printk(TPACPI_DBG_INIT, "initializing brightness subdriver\n");
5920
5921         mutex_init(&brightness_mutex);
5922
5923         /*
5924          * We always attempt to detect acpi support, so as to switch
5925          * Lenovo Vista BIOS to ACPI brightness mode even if we are not
5926          * going to publish a backlight interface
5927          */
5928         b = tpacpi_check_std_acpi_brightness_support();
5929         if (b > 0) {
5930
5931                 if (acpi_video_backlight_support()) {
5932                         if (brightness_enable > 1) {
5933                                 printk(TPACPI_NOTICE
5934                                        "Standard ACPI backlight interface "
5935                                        "available, not loading native one.\n");
5936                                 return 1;
5937                         } else if (brightness_enable == 1) {
5938                                 printk(TPACPI_NOTICE
5939                                        "Backlight control force enabled, even if standard "
5940                                        "ACPI backlight interface is available\n");
5941                         }
5942                 } else {
5943                         if (brightness_enable > 1) {
5944                                 printk(TPACPI_NOTICE
5945                                        "Standard ACPI backlight interface not "
5946                                        "available, thinkpad_acpi native "
5947                                        "brightness control enabled\n");
5948                         }
5949                 }
5950         }
5951
5952         if (!brightness_enable) {
5953                 dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_BRGHT,
5954                            "brightness support disabled by "
5955                            "module parameter\n");
5956                 return 1;
5957         }
5958
5959         if (b > 16) {
5960                 printk(TPACPI_ERR
5961                        "Unsupported brightness interface, "
5962                        "please contact %s\n", TPACPI_MAIL);
5963                 return 1;
5964         }
5965         if (b == 16)
5966                 tp_features.bright_16levels = 1;
5967
5968         /*
5969          * Check for module parameter bogosity, note that we
5970          * init brightness_mode to TPACPI_BRGHT_MODE_MAX in order to be
5971          * able to detect "unspecified"
5972          */
5973         if (brightness_mode > TPACPI_BRGHT_MODE_MAX)
5974                 return -EINVAL;
5975
5976         /* TPACPI_BRGHT_MODE_AUTO not implemented yet, just use default */
5977         if (brightness_mode == TPACPI_BRGHT_MODE_AUTO ||
5978             brightness_mode == TPACPI_BRGHT_MODE_MAX) {
5979                 if (thinkpad_id.vendor == PCI_VENDOR_ID_IBM) {
5980                         /*
5981                          * IBM models that define HBRV probably have
5982                          * EC-based backlight level control
5983                          */
5984                         if (acpi_evalf(ec_handle, NULL, "HBRV", "qd"))
5985                                 /* T40-T43, R50-R52, R50e, R51e, X31-X41 */
5986                                 brightness_mode = TPACPI_BRGHT_MODE_ECNVRAM;
5987                         else
5988                                 /* all other IBM ThinkPads */
5989                                 brightness_mode = TPACPI_BRGHT_MODE_UCMS_STEP;
5990                 } else
5991                         /* All Lenovo ThinkPads */
5992                         brightness_mode = TPACPI_BRGHT_MODE_UCMS_STEP;
5993
5994                 dbg_printk(TPACPI_DBG_BRGHT,
5995                            "selected brightness_mode=%d\n",
5996                            brightness_mode);
5997         }
5998
5999         if (tpacpi_brightness_get_raw(&b) < 0)
6000                 return 1;
6001
6002         if (tp_features.bright_16levels)
6003                 printk(TPACPI_INFO
6004                        "detected a 16-level brightness capable ThinkPad\n");
6005
6006         ibm_backlight_device = backlight_device_register(
6007                                         TPACPI_BACKLIGHT_DEV_NAME, NULL, NULL,
6008                                         &ibm_backlight_data);
6009         if (IS_ERR(ibm_backlight_device)) {
6010                 printk(TPACPI_ERR "Could not register backlight device\n");
6011                 return PTR_ERR(ibm_backlight_device);
6012         }
6013         vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_BRGHT,
6014                         "brightness is supported\n");
6015
6016         ibm_backlight_device->props.max_brightness =
6017                                 (tp_features.bright_16levels)? 15 : 7;
6018         ibm_backlight_device->props.brightness = b & TP_EC_BACKLIGHT_LVLMSK;
6019         backlight_update_status(ibm_backlight_device);
6020
6021         return 0;
6022 }
6023
6024 static void brightness_suspend(pm_message_t state)
6025 {
6026         tpacpi_brightness_checkpoint_nvram();
6027 }
6028
6029 static void brightness_shutdown(void)
6030 {
6031         tpacpi_brightness_checkpoint_nvram();
6032 }
6033
6034 static void brightness_exit(void)
6035 {
6036         if (ibm_backlight_device) {
6037                 vdbg_printk(TPACPI_DBG_EXIT | TPACPI_DBG_BRGHT,
6038                             "calling backlight_device_unregister()\n");
6039                 backlight_device_unregister(ibm_backlight_device);
6040         }
6041
6042         tpacpi_brightness_checkpoint_nvram();
6043 }
6044
6045 static int brightness_read(char *p)
6046 {
6047         int len = 0;
6048         int level;
6049
6050         level = brightness_get(NULL);
6051         if (level < 0) {
6052                 len += sprintf(p + len, "level:\t\tunreadable\n");
6053         } else {
6054                 len += sprintf(p + len, "level:\t\t%d\n", level);
6055                 len += sprintf(p + len, "commands:\tup, down\n");
6056                 len += sprintf(p + len, "commands:\tlevel <level>"
6057                                " (<level> is 0-%d)\n",
6058                                (tp_features.bright_16levels) ? 15 : 7);
6059         }
6060
6061         return len;
6062 }
6063
6064 static int brightness_write(char *buf)
6065 {
6066         int level;
6067         int rc;
6068         char *cmd;
6069         int max_level = (tp_features.bright_16levels) ? 15 : 7;
6070
6071         level = brightness_get(NULL);
6072         if (level < 0)
6073                 return level;
6074
6075         while ((cmd = next_cmd(&buf))) {
6076                 if (strlencmp(cmd, "up") == 0) {
6077                         if (level < max_level)
6078                                 level++;
6079                 } else if (strlencmp(cmd, "down") == 0) {
6080                         if (level > 0)
6081                                 level--;
6082                 } else if (sscanf(cmd, "level %d", &level) == 1 &&
6083                            level >= 0 && level <= max_level) {
6084                         /* new level set */
6085                 } else
6086                         return -EINVAL;
6087         }
6088
6089         tpacpi_disclose_usertask("procfs brightness",
6090                         "set level to %d\n", level);
6091
6092         /*
6093          * Now we know what the final level should be, so we try to set it.
6094          * Doing it this way makes the syscall restartable in case of EINTR
6095          */
6096         rc = brightness_set(level);
6097         return (rc == -EINTR)? ERESTARTSYS : rc;
6098 }
6099
6100 static struct ibm_struct brightness_driver_data = {
6101         .name = "brightness",
6102         .read = brightness_read,
6103         .write = brightness_write,
6104         .exit = brightness_exit,
6105         .suspend = brightness_suspend,
6106         .shutdown = brightness_shutdown,
6107 };
6108
6109 /*************************************************************************
6110  * Volume subdriver
6111  */
6112
6113 static int volume_offset = 0x30;
6114
6115 static int volume_read(char *p)
6116 {
6117         int len = 0;
6118         u8 level;
6119
6120         if (!acpi_ec_read(volume_offset, &level)) {
6121                 len += sprintf(p + len, "level:\t\tunreadable\n");
6122         } else {
6123                 len += sprintf(p + len, "level:\t\t%d\n", level & 0xf);
6124                 len += sprintf(p + len, "mute:\t\t%s\n", onoff(level, 6));
6125                 len += sprintf(p + len, "commands:\tup, down, mute\n");
6126                 len += sprintf(p + len, "commands:\tlevel <level>"
6127                                " (<level> is 0-15)\n");
6128         }
6129
6130         return len;
6131 }
6132
6133 static int volume_write(char *buf)
6134 {
6135         int cmos_cmd, inc, i;
6136         u8 level, mute;
6137         int new_level, new_mute;
6138         char *cmd;
6139
6140         while ((cmd = next_cmd(&buf))) {
6141                 if (!acpi_ec_read(volume_offset, &level))
6142                         return -EIO;
6143                 new_mute = mute = level & 0x40;
6144                 new_level = level = level & 0xf;
6145
6146                 if (strlencmp(cmd, "up") == 0) {
6147                         if (mute)
6148                                 new_mute = 0;
6149                         else
6150                                 new_level = level == 15 ? 15 : level + 1;
6151                 } else if (strlencmp(cmd, "down") == 0) {
6152                         if (mute)
6153                                 new_mute = 0;
6154                         else
6155                                 new_level = level == 0 ? 0 : level - 1;
6156                 } else if (sscanf(cmd, "level %d", &new_level) == 1 &&
6157                            new_level >= 0 && new_level <= 15) {
6158                         /* new_level set */
6159                 } else if (strlencmp(cmd, "mute") == 0) {
6160                         new_mute = 0x40;
6161                 } else
6162                         return -EINVAL;
6163
6164                 if (new_level != level) {
6165                         /* mute doesn't change */
6166
6167                         cmos_cmd = (new_level > level) ?
6168                                         TP_CMOS_VOLUME_UP : TP_CMOS_VOLUME_DOWN;
6169                         inc = new_level > level ? 1 : -1;
6170
6171                         if (mute && (issue_thinkpad_cmos_command(cmos_cmd) ||
6172                                      !acpi_ec_write(volume_offset, level)))
6173                                 return -EIO;
6174
6175                         for (i = level; i != new_level; i += inc)
6176                                 if (issue_thinkpad_cmos_command(cmos_cmd) ||
6177                                     !acpi_ec_write(volume_offset, i + inc))
6178                                         return -EIO;
6179
6180                         if (mute &&
6181                             (issue_thinkpad_cmos_command(TP_CMOS_VOLUME_MUTE) ||
6182                              !acpi_ec_write(volume_offset, new_level + mute))) {
6183                                 return -EIO;
6184                         }
6185                 }
6186
6187                 if (new_mute != mute) {
6188                         /* level doesn't change */
6189
6190                         cmos_cmd = (new_mute) ?
6191                                    TP_CMOS_VOLUME_MUTE : TP_CMOS_VOLUME_UP;
6192
6193                         if (issue_thinkpad_cmos_command(cmos_cmd) ||
6194                             !acpi_ec_write(volume_offset, level + new_mute))
6195                                 return -EIO;
6196                 }
6197         }
6198
6199         return 0;
6200 }
6201
6202 static struct ibm_struct volume_driver_data = {
6203         .name = "volume",
6204         .read = volume_read,
6205         .write = volume_write,
6206 };
6207
6208 /*************************************************************************
6209  * Fan subdriver
6210  */
6211
6212 /*
6213  * FAN ACCESS MODES
6214  *
6215  * TPACPI_FAN_RD_ACPI_GFAN:
6216  *      ACPI GFAN method: returns fan level
6217  *
6218  *      see TPACPI_FAN_WR_ACPI_SFAN
6219  *      EC 0x2f (HFSP) not available if GFAN exists
6220  *
6221  * TPACPI_FAN_WR_ACPI_SFAN:
6222  *      ACPI SFAN method: sets fan level, 0 (stop) to 7 (max)
6223  *
6224  *      EC 0x2f (HFSP) might be available *for reading*, but do not use
6225  *      it for writing.
6226  *
6227  * TPACPI_FAN_WR_TPEC:
6228  *      ThinkPad EC register 0x2f (HFSP): fan control loop mode
6229  *      Supported on almost all ThinkPads
6230  *
6231  *      Fan speed changes of any sort (including those caused by the
6232  *      disengaged mode) are usually done slowly by the firmware as the
6233  *      maximum ammount of fan duty cycle change per second seems to be
6234  *      limited.
6235  *
6236  *      Reading is not available if GFAN exists.
6237  *      Writing is not available if SFAN exists.
6238  *
6239  *      Bits
6240  *       7      automatic mode engaged;
6241  *              (default operation mode of the ThinkPad)
6242  *              fan level is ignored in this mode.
6243  *       6      full speed mode (takes precedence over bit 7);
6244  *              not available on all thinkpads.  May disable
6245  *              the tachometer while the fan controller ramps up
6246  *              the speed (which can take up to a few *minutes*).
6247  *              Speeds up fan to 100% duty-cycle, which is far above
6248  *              the standard RPM levels.  It is not impossible that
6249  *              it could cause hardware damage.
6250  *      5-3     unused in some models.  Extra bits for fan level
6251  *              in others, but still useless as all values above
6252  *              7 map to the same speed as level 7 in these models.
6253  *      2-0     fan level (0..7 usually)
6254  *                      0x00 = stop
6255  *                      0x07 = max (set when temperatures critical)
6256  *              Some ThinkPads may have other levels, see
6257  *              TPACPI_FAN_WR_ACPI_FANS (X31/X40/X41)
6258  *
6259  *      FIRMWARE BUG: on some models, EC 0x2f might not be initialized at
6260  *      boot. Apparently the EC does not intialize it, so unless ACPI DSDT
6261  *      does so, its initial value is meaningless (0x07).
6262  *
6263  *      For firmware bugs, refer to:
6264  *      http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
6265  *
6266  *      ----
6267  *
6268  *      ThinkPad EC register 0x84 (LSB), 0x85 (MSB):
6269  *      Main fan tachometer reading (in RPM)
6270  *
6271  *      This register is present on all ThinkPads with a new-style EC, and
6272  *      it is known not to be pre