Merge branch 'panasonic' into test
[linux-2.6.git] / drivers / misc / panasonic-laptop.c
1 /*
2  *  Panasonic HotKey and LCD brightness control driver
3  *  (C) 2004 Hiroshi Miura <miura@da-cha.org>
4  *  (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
5  *  (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
6  *  (C) 2004 David Bronaugh <dbronaugh>
7  *  (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
8  *
9  *  derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
10  *
11  *  This program is free software; you can redistribute it and/or modify
12  *  it under the terms of the GNU General Public License version 2 as
13  *  publicshed by the Free Software Foundation.
14  *
15  *  This program is distributed in the hope that it will be useful,
16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  *  GNU General Public License for more details.
19  *
20  *  You should have received a copy of the GNU General Public License
21  *  along with this program; if not, write to the Free Software
22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
23  *
24  *---------------------------------------------------------------------------
25  *
26  * ChangeLog:
27  *      Sep.23, 2008    Harald Welte <laforge@gnumonks.org>
28  *              -v0.95  rename driver from drivers/acpi/pcc_acpi.c to
29  *                      drivers/misc/panasonic-laptop.c
30  *
31  *      Jul.04, 2008    Harald Welte <laforge@gnumonks.org>
32  *              -v0.94  replace /proc interface with device attributes
33  *                      support {set,get}keycode on th input device
34  *
35  *      Jun.27, 2008    Harald Welte <laforge@gnumonks.org>
36  *              -v0.92  merge with 2.6.26-rc6 input API changes
37  *                      remove broken <= 2.6.15 kernel support
38  *                      resolve all compiler warnings
39  *                      various coding style fixes (checkpatch.pl)
40  *                      add support for backlight api
41  *                      major code restructuring
42  *
43  *      Dac.28, 2007    Harald Welte <laforge@gnumonks.org>
44  *              -v0.91  merge with 2.6.24-rc6 ACPI changes
45  *
46  *      Nov.04, 2006    Hiroshi Miura <miura@da-cha.org>
47  *              -v0.9   remove warning about section reference.
48  *                      remove acpi_os_free
49  *                      add /proc/acpi/pcc/brightness interface for HAL access
50  *                      merge dbronaugh's enhancement
51  *                      Aug.17, 2004 David Bronaugh (dbronaugh)
52  *                              - Added screen brightness setting interface
53  *                                Thanks to FreeBSD crew (acpi_panasonic.c)
54  *                                for the ideas I needed to accomplish it
55  *
56  *      May.29, 2006    Hiroshi Miura <miura@da-cha.org>
57  *              -v0.8.4 follow to change keyinput structure
58  *                      thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
59  *                      Jacob Bower <jacob.bower@ic.ac.uk> and
60  *                      Hiroshi Yokota for providing solutions.
61  *
62  *      Oct.02, 2004    Hiroshi Miura <miura@da-cha.org>
63  *              -v0.8.2 merge code of YOKOTA Hiroshi
64  *                                      <yokota@netlab.is.tsukuba.ac.jp>.
65  *                      Add sticky key mode interface.
66  *                      Refactoring acpi_pcc_generate_keyinput().
67  *
68  *      Sep.15, 2004    Hiroshi Miura <miura@da-cha.org>
69  *              -v0.8   Generate key input event on input subsystem.
70  *                      This is based on yet another driver written by
71  *                                                      Ryuta Nakanishi.
72  *
73  *      Sep.10, 2004    Hiroshi Miura <miura@da-cha.org>
74  *              -v0.7   Change proc interface functions using seq_file
75  *                      facility as same as other ACPI drivers.
76  *
77  *      Aug.28, 2004    Hiroshi Miura <miura@da-cha.org>
78  *              -v0.6.4 Fix a silly error with status checking
79  *
80  *      Aug.25, 2004    Hiroshi Miura <miura@da-cha.org>
81  *              -v0.6.3 replace read_acpi_int by standard function
82  *                                                      acpi_evaluate_integer
83  *                      some clean up and make smart copyright notice.
84  *                      fix return value of pcc_acpi_get_key()
85  *                      fix checking return value of acpi_bus_register_driver()
86  *
87  *      Aug.22, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
88  *              -v0.6.2 Add check on ACPI data (num_sifr)
89  *                      Coding style cleanups, better error messages/handling
90  *                      Fixed an off-by-one error in memory allocation
91  *
92  *      Aug.21, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
93  *              -v0.6.1 Fix a silly error with status checking
94  *
95  *      Aug.20, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
96  *              - v0.6  Correct brightness controls to reflect reality
97  *                      based on information gleaned by Hiroshi Miura
98  *                      and discussions with Hiroshi Miura
99  *
100  *      Aug.10, 2004    Hiroshi Miura <miura@da-cha.org>
101  *              - v0.5  support LCD brightness control
102  *                      based on the disclosed information by MEI.
103  *
104  *      Jul.25, 2004    Hiroshi Miura <miura@da-cha.org>
105  *              - v0.4  first post version
106  *                      add function to retrive SIFR
107  *
108  *      Jul.24, 2004    Hiroshi Miura <miura@da-cha.org>
109  *              - v0.3  get proper status of hotkey
110  *
111  *      Jul.22, 2004    Hiroshi Miura <miura@da-cha.org>
112  *              - v0.2  add HotKey handler
113  *
114  *      Jul.17, 2004    Hiroshi Miura <miura@da-cha.org>
115  *              - v0.1  start from toshiba_acpi driver written by John Belmonte
116  *
117  */
118
119 #include <linux/version.h>
120 #include <linux/kernel.h>
121 #include <linux/module.h>
122 #include <linux/init.h>
123 #include <linux/types.h>
124 #include <linux/backlight.h>
125 #include <linux/ctype.h>
126 #include <linux/seq_file.h>
127 #include <linux/uaccess.h>
128 #include <acpi/acpi_bus.h>
129 #include <acpi/acpi_drivers.h>
130 #include <linux/input.h>
131
132
133 #ifndef ACPI_HOTKEY_COMPONENT
134 #define ACPI_HOTKEY_COMPONENT   0x10000000
135 #endif
136
137 #define _COMPONENT              ACPI_HOTKEY_COMPONENT
138
139 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
140 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
141 MODULE_LICENSE("GPL");
142
143 #define LOGPREFIX "pcc_acpi: "
144
145 /* Define ACPI PATHs */
146 /* Lets note hotkeys */
147 #define METHOD_HKEY_QUERY       "HINF"
148 #define METHOD_HKEY_SQTY        "SQTY"
149 #define METHOD_HKEY_SINF        "SINF"
150 #define METHOD_HKEY_SSET        "SSET"
151 #define HKEY_NOTIFY              0x80
152
153 #define ACPI_PCC_DRIVER_NAME    "Panasonic Laptop Support"
154 #define ACPI_PCC_DEVICE_NAME    "Hotkey"
155 #define ACPI_PCC_CLASS          "pcc"
156
157 #define ACPI_PCC_INPUT_PHYS     "panasonic/hkey0"
158
159 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
160    ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
161 */
162 enum SINF_BITS { SINF_NUM_BATTERIES = 0,
163                  SINF_LCD_TYPE,
164                  SINF_AC_MAX_BRIGHT,
165                  SINF_AC_MIN_BRIGHT,
166                  SINF_AC_CUR_BRIGHT,
167                  SINF_DC_MAX_BRIGHT,
168                  SINF_DC_MIN_BRIGHT,
169                  SINF_DC_CUR_BRIGHT,
170                  SINF_MUTE,
171                  SINF_RESERVED,
172                  SINF_ENV_STATE,
173                  SINF_STICKY_KEY = 0x80,
174         };
175 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
176
177 static int acpi_pcc_hotkey_add(struct acpi_device *device);
178 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
179 static int acpi_pcc_hotkey_resume(struct acpi_device *device);
180
181 static const struct acpi_device_id pcc_device_ids[] = {
182         { "MAT0012", 0},
183         { "MAT0013", 0},
184         { "MAT0018", 0},
185         { "MAT0019", 0},
186         { "", 0},
187 };
188
189 static struct acpi_driver acpi_pcc_driver = {
190         .name =         ACPI_PCC_DRIVER_NAME,
191         .class =        ACPI_PCC_CLASS,
192         .ids =          pcc_device_ids,
193         .ops =          {
194                                 .add =          acpi_pcc_hotkey_add,
195                                 .remove =       acpi_pcc_hotkey_remove,
196                                 .resume =       acpi_pcc_hotkey_resume,
197                         },
198 };
199
200 #define KEYMAP_SIZE             11
201 static const int initial_keymap[KEYMAP_SIZE] = {
202         /*  0 */ KEY_RESERVED,
203         /*  1 */ KEY_BRIGHTNESSDOWN,
204         /*  2 */ KEY_BRIGHTNESSUP,
205         /*  3 */ KEY_DISPLAYTOGGLE,
206         /*  4 */ KEY_MUTE,
207         /*  5 */ KEY_VOLUMEDOWN,
208         /*  6 */ KEY_VOLUMEUP,
209         /*  7 */ KEY_SLEEP,
210         /*  8 */ KEY_PROG1, /* Change CPU boost */
211         /*  9 */ KEY_BATTERY,
212         /* 10 */ KEY_SUSPEND,
213 };
214
215 struct pcc_acpi {
216         acpi_handle             handle;
217         unsigned long           num_sifr;
218         int                     sticky_mode;
219         u32                     *sinf;
220         struct acpi_device      *device;
221         struct input_dev        *input_dev;
222         struct backlight_device *backlight;
223         int                     keymap[KEYMAP_SIZE];
224 };
225
226 struct pcc_keyinput {
227         struct acpi_hotkey      *hotkey;
228 };
229
230 /* method access functions */
231 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
232 {
233         union acpi_object in_objs[] = {
234                 { .integer.type  = ACPI_TYPE_INTEGER,
235                   .integer.value = func, },
236                 { .integer.type  = ACPI_TYPE_INTEGER,
237                   .integer.value = val, },
238         };
239         struct acpi_object_list params = {
240                 .count   = ARRAY_SIZE(in_objs),
241                 .pointer = in_objs,
242         };
243         acpi_status status = AE_OK;
244
245         ACPI_FUNCTION_TRACE("acpi_pcc_write_sset");
246
247         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
248                                       &params, NULL);
249
250         return status == AE_OK;
251 }
252
253 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
254 {
255         unsigned long s;
256         acpi_status status;
257
258         ACPI_FUNCTION_TRACE("acpi_pcc_get_sqty");
259
260         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
261                                        NULL, &s);
262         if (ACPI_SUCCESS(status))
263                 return s;
264         else {
265                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
266                                   "evaluation error HKEY.SQTY\n"));
267                 return -EINVAL;
268         }
269 }
270
271 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
272 {
273         acpi_status status;
274         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
275         union acpi_object *hkey = NULL;
276         int i;
277
278         ACPI_FUNCTION_TRACE("acpi_pcc_retrieve_biosdata");
279
280         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
281                                       &buffer);
282         if (ACPI_FAILURE(status)) {
283                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
284                                   "evaluation error HKEY.SINF\n"));
285                 return 0;
286         }
287
288         hkey = buffer.pointer;
289         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
290                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
291                 goto end;
292         }
293
294         if (pcc->num_sifr < hkey->package.count) {
295                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
296                                  "SQTY reports bad SINF length\n"));
297                 status = AE_ERROR;
298                 goto end;
299         }
300
301         for (i = 0; i < hkey->package.count; i++) {
302                 union acpi_object *element = &(hkey->package.elements[i]);
303                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
304                         sinf[i] = element->integer.value;
305                 } else
306                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
307                                          "Invalid HKEY.SINF data\n"));
308         }
309         sinf[hkey->package.count] = -1;
310
311 end:
312         kfree(buffer.pointer);
313         return status == AE_OK;
314 }
315
316 /* backlight API interface functions */
317
318 /* This driver currently treats AC and DC brightness identical,
319  * since we don't need to invent an interface to the core ACPI
320  * logic to receive events in case a power supply is plugged in
321  * or removed */
322
323 static int bl_get(struct backlight_device *bd)
324 {
325         struct pcc_acpi *pcc = bl_get_data(bd);
326
327         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
328                 return -EIO;
329
330         return pcc->sinf[SINF_AC_CUR_BRIGHT];
331 }
332
333 static int bl_set_status(struct backlight_device *bd)
334 {
335         struct pcc_acpi *pcc = bl_get_data(bd);
336         int bright = bd->props.brightness;
337         int rc;
338
339         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
340                 return -EIO;
341
342         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
343                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
344
345         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
346                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
347
348         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
349             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
350                 return -EINVAL;
351
352         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
353         if (rc < 0)
354                 return rc;
355
356         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
357 }
358
359 static struct backlight_ops pcc_backlight_ops = {
360         .get_brightness = bl_get,
361         .update_status  = bl_set_status,
362 };
363
364
365 /* sysfs user interface functions */
366
367 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
368                             char *buf)
369 {
370         struct acpi_device *acpi = to_acpi_device(dev);
371         struct pcc_acpi *pcc = acpi_driver_data(acpi);
372
373         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
374                 return -EIO;
375
376         return sprintf(buf, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
377 }
378
379 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
380                             char *buf)
381 {
382         struct acpi_device *acpi = to_acpi_device(dev);
383         struct pcc_acpi *pcc = acpi_driver_data(acpi);
384
385         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
386                 return -EIO;
387
388         return sprintf(buf, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
389 }
390
391 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
392                          char *buf)
393 {
394         struct acpi_device *acpi = to_acpi_device(dev);
395         struct pcc_acpi *pcc = acpi_driver_data(acpi);
396
397         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
398                 return -EIO;
399
400         return sprintf(buf, "%u\n", pcc->sinf[SINF_MUTE]);
401 }
402
403 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
404                            char *buf)
405 {
406         struct acpi_device *acpi = to_acpi_device(dev);
407         struct pcc_acpi *pcc = acpi_driver_data(acpi);
408
409         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
410                 return -EIO;
411
412         return sprintf(buf, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
413 }
414
415 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
416                           const char *buf, size_t count)
417 {
418         struct acpi_device *acpi = to_acpi_device(dev);
419         struct pcc_acpi *pcc = acpi_driver_data(acpi);
420         int val;
421
422         if (count && sscanf(buf, "%i", &val) == 1 &&
423             (val == 0 || val == 1)) {
424                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
425                 pcc->sticky_mode = val;
426         }
427
428         return count;
429 }
430
431 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
432 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
433 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
434 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
435
436 static struct attribute *pcc_sysfs_entries[] = {
437         &dev_attr_numbatt.attr,
438         &dev_attr_lcdtype.attr,
439         &dev_attr_mute.attr,
440         &dev_attr_sticky_key.attr,
441         NULL,
442 };
443
444 static struct attribute_group pcc_attr_group = {
445         .name   = NULL,         /* put in device directory */
446         .attrs  = pcc_sysfs_entries,
447 };
448
449
450 /* hotkey input device driver */
451
452 static int pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
453 {
454         struct pcc_acpi *pcc = input_get_drvdata(dev);
455
456         if (scancode >= ARRAY_SIZE(pcc->keymap))
457                 return -EINVAL;
458
459         *keycode = pcc->keymap[scancode];
460
461         return 0;
462 }
463
464 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
465 {
466         int i;
467
468         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
469                 if (pcc->keymap[i] == keycode)
470                         return i+1;
471         }
472
473         return 0;
474 }
475
476 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
477 {
478         struct pcc_acpi *pcc = input_get_drvdata(dev);
479         int oldkeycode;
480
481         if (scancode >= ARRAY_SIZE(pcc->keymap))
482                 return -EINVAL;
483
484         if (keycode < 0 || keycode > KEY_MAX)
485                 return -EINVAL;
486
487         oldkeycode = pcc->keymap[scancode];
488         pcc->keymap[scancode] = keycode;
489
490         set_bit(keycode, dev->keybit);
491
492         if (!keymap_get_by_keycode(pcc, oldkeycode))
493                 clear_bit(oldkeycode, dev->keybit);
494
495         return 0;
496 }
497
498 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
499 {
500         struct input_dev *hotk_input_dev = pcc->input_dev;
501         int rc;
502         int key_code, hkey_num;
503         unsigned long result;
504
505         ACPI_FUNCTION_TRACE("acpi_pcc_generate_keyinput");
506
507         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
508                                    NULL, &result);
509         if (!ACPI_SUCCESS(rc)) {
510                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
511                                  "error getting hotkey status\n"));
512                 return;
513         }
514
515         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
516
517         hkey_num = result & 0xf;
518
519         if (hkey_num < 0 || hkey_num > ARRAY_SIZE(pcc->keymap)) {
520                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
521                                   "hotkey number out of range: %d\n",
522                                   hkey_num));
523                 return;
524         }
525
526         key_code = pcc->keymap[hkey_num];
527
528         if (key_code != KEY_RESERVED) {
529                 int pushed = (result & 0x80) ? TRUE : FALSE;
530
531                 input_report_key(hotk_input_dev, key_code, pushed);
532                 input_sync(hotk_input_dev);
533         }
534
535         return;
536 }
537
538 static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
539 {
540         struct pcc_acpi *pcc = (struct pcc_acpi *) data;
541
542         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_notify");
543
544         switch (event) {
545         case HKEY_NOTIFY:
546                 acpi_pcc_generate_keyinput(pcc);
547                 break;
548         default:
549                 /* nothing to do */
550                 break;
551         }
552 }
553
554 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
555 {
556         int i, rc;
557
558         ACPI_FUNCTION_TRACE("acpi_pcc_init_input");
559
560         pcc->input_dev = input_allocate_device();
561         if (!pcc->input_dev) {
562                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
563                                   "Couldn't allocate input device for hotkey"));
564                 return -ENOMEM;
565         }
566
567         pcc->input_dev->evbit[0] = BIT(EV_KEY);
568
569         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
570         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
571         pcc->input_dev->id.bustype = BUS_HOST;
572         pcc->input_dev->id.vendor = 0x0001;
573         pcc->input_dev->id.product = 0x0001;
574         pcc->input_dev->id.version = 0x0100;
575         pcc->input_dev->getkeycode = pcc_getkeycode;
576         pcc->input_dev->setkeycode = pcc_setkeycode;
577
578         /* load initial keymap */
579         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
580
581         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
582                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
583         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
584
585         input_set_drvdata(pcc->input_dev, pcc);
586
587         rc = input_register_device(pcc->input_dev);
588         if (rc < 0)
589                 input_free_device(pcc->input_dev);
590
591         return rc;
592 }
593
594 /* kernel module interface */
595
596 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
597 {
598         struct pcc_acpi *pcc = acpi_driver_data(device);
599         acpi_status status = AE_OK;
600
601         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_resume");
602
603         if (device == NULL || pcc == NULL)
604                 return -EINVAL;
605
606         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
607                           pcc->sticky_mode));
608
609         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
610
611         return status == AE_OK ? 0 : -EINVAL;
612 }
613
614 static int acpi_pcc_hotkey_add(struct acpi_device *device)
615 {
616         acpi_status status;
617         struct pcc_acpi *pcc;
618         int num_sifr, result;
619
620         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_add");
621
622         if (!device)
623                 return -EINVAL;
624
625         num_sifr = acpi_pcc_get_sqty(device);
626
627         if (num_sifr > 255) {
628                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
629                 return -ENODEV;
630         }
631
632         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
633         if (!pcc) {
634                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
635                                   "Couldn't allocate mem for pcc"));
636                 return -ENOMEM;
637         }
638
639         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
640         if (!pcc->sinf) {
641                 result = -ENOMEM;
642                 goto out_hotkey;
643         }
644
645         pcc->device = device;
646         pcc->handle = device->handle;
647         pcc->num_sifr = num_sifr;
648         acpi_driver_data(device) = pcc;
649         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
650         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
651
652         result = acpi_pcc_init_input(pcc);
653         if (result) {
654                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
655                                   "Error installing keyinput handler\n"));
656                 goto out_sinf;
657         }
658
659         /* initialize hotkey input device */
660         status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
661                                              acpi_pcc_hotkey_notify, pcc);
662
663         if (ACPI_FAILURE(status)) {
664                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
665                                   "Error installing notify handler\n"));
666                 result = -ENODEV;
667                 goto out_input;
668         }
669
670         /* initialize backlight */
671         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
672                                                    &pcc_backlight_ops);
673         if (IS_ERR(pcc->backlight))
674                 goto out_notify;
675
676         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
677                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
678                                  "Couldn't retrieve BIOS data\n"));
679                 goto out_backlight;
680         }
681
682         /* read the initial brightness setting from the hardware */
683         pcc->backlight->props.max_brightness =
684                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
685         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
686
687         /* read the initial sticky key mode from the hardware */
688         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
689
690         /* add sysfs attributes */
691         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
692         if (result)
693                 goto out_backlight;
694
695         return 0;
696
697 out_backlight:
698         backlight_device_unregister(pcc->backlight);
699 out_notify:
700         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
701                                    acpi_pcc_hotkey_notify);
702 out_input:
703         input_unregister_device(pcc->input_dev);
704         /* no need to input_free_device() since core input API refcount and
705          * free()s the device */
706 out_sinf:
707         kfree(pcc->sinf);
708 out_hotkey:
709         kfree(pcc);
710
711         return result;
712 }
713
714 static int __init acpi_pcc_init(void)
715 {
716         int result = 0;
717
718         ACPI_FUNCTION_TRACE("acpi_pcc_init");
719
720         if (acpi_disabled)
721                 return -ENODEV;
722
723         result = acpi_bus_register_driver(&acpi_pcc_driver);
724         if (result < 0) {
725                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
726                                   "Error registering hotkey driver\n"));
727                 return -ENODEV;
728         }
729
730         return 0;
731 }
732
733 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
734 {
735         struct pcc_acpi *pcc = acpi_driver_data(device);
736
737         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_remove");
738
739         if (!device || !pcc)
740                 return -EINVAL;
741
742         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
743
744         backlight_device_unregister(pcc->backlight);
745
746         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
747                                    acpi_pcc_hotkey_notify);
748
749         input_unregister_device(pcc->input_dev);
750         /* no need to input_free_device() since core input API refcount and
751          * free()s the device */
752
753         kfree(pcc->sinf);
754         kfree(pcc);
755
756         return 0;
757 }
758
759 static void __exit acpi_pcc_exit(void)
760 {
761         ACPI_FUNCTION_TRACE("acpi_pcc_exit");
762
763         acpi_bus_unregister_driver(&acpi_pcc_driver);
764 }
765
766 module_init(acpi_pcc_init);
767 module_exit(acpi_pcc_exit);