c9fc479fc290ee5bb5266cd25f6a23397e7bf1da
[linux-2.6.git] / drivers / platform / x86 / 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/kernel.h>
120 #include <linux/module.h>
121 #include <linux/init.h>
122 #include <linux/types.h>
123 #include <linux/backlight.h>
124 #include <linux/ctype.h>
125 #include <linux/seq_file.h>
126 #include <linux/uaccess.h>
127 #include <acpi/acpi_bus.h>
128 #include <acpi/acpi_drivers.h>
129 #include <linux/input.h>
130
131
132 #ifndef ACPI_HOTKEY_COMPONENT
133 #define ACPI_HOTKEY_COMPONENT   0x10000000
134 #endif
135
136 #define _COMPONENT              ACPI_HOTKEY_COMPONENT
137
138 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
139 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
140 MODULE_LICENSE("GPL");
141
142 #define LOGPREFIX "pcc_acpi: "
143
144 /* Define ACPI PATHs */
145 /* Lets note hotkeys */
146 #define METHOD_HKEY_QUERY       "HINF"
147 #define METHOD_HKEY_SQTY        "SQTY"
148 #define METHOD_HKEY_SINF        "SINF"
149 #define METHOD_HKEY_SSET        "SSET"
150 #define HKEY_NOTIFY              0x80
151
152 #define ACPI_PCC_DRIVER_NAME    "Panasonic Laptop Support"
153 #define ACPI_PCC_DEVICE_NAME    "Hotkey"
154 #define ACPI_PCC_CLASS          "pcc"
155
156 #define ACPI_PCC_INPUT_PHYS     "panasonic/hkey0"
157
158 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
159    ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
160 */
161 enum SINF_BITS { SINF_NUM_BATTERIES = 0,
162                  SINF_LCD_TYPE,
163                  SINF_AC_MAX_BRIGHT,
164                  SINF_AC_MIN_BRIGHT,
165                  SINF_AC_CUR_BRIGHT,
166                  SINF_DC_MAX_BRIGHT,
167                  SINF_DC_MIN_BRIGHT,
168                  SINF_DC_CUR_BRIGHT,
169                  SINF_MUTE,
170                  SINF_RESERVED,
171                  SINF_ENV_STATE,
172                  SINF_STICKY_KEY = 0x80,
173         };
174 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
175
176 static int acpi_pcc_hotkey_add(struct acpi_device *device);
177 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
178 static int acpi_pcc_hotkey_resume(struct acpi_device *device);
179 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
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 MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
189
190 static struct acpi_driver acpi_pcc_driver = {
191         .name =         ACPI_PCC_DRIVER_NAME,
192         .class =        ACPI_PCC_CLASS,
193         .ids =          pcc_device_ids,
194         .ops =          {
195                                 .add =          acpi_pcc_hotkey_add,
196                                 .remove =       acpi_pcc_hotkey_remove,
197                                 .resume =       acpi_pcc_hotkey_resume,
198                                 .notify =       acpi_pcc_hotkey_notify,
199                         },
200 };
201
202 #define KEYMAP_SIZE             11
203 static const unsigned int initial_keymap[KEYMAP_SIZE] = {
204         /*  0 */ KEY_RESERVED,
205         /*  1 */ KEY_BRIGHTNESSDOWN,
206         /*  2 */ KEY_BRIGHTNESSUP,
207         /*  3 */ KEY_DISPLAYTOGGLE,
208         /*  4 */ KEY_MUTE,
209         /*  5 */ KEY_VOLUMEDOWN,
210         /*  6 */ KEY_VOLUMEUP,
211         /*  7 */ KEY_SLEEP,
212         /*  8 */ KEY_PROG1, /* Change CPU boost */
213         /*  9 */ KEY_BATTERY,
214         /* 10 */ KEY_SUSPEND,
215 };
216
217 struct pcc_acpi {
218         acpi_handle             handle;
219         unsigned long           num_sifr;
220         int                     sticky_mode;
221         u32                     *sinf;
222         struct acpi_device      *device;
223         struct input_dev        *input_dev;
224         struct backlight_device *backlight;
225         unsigned int            keymap[KEYMAP_SIZE];
226 };
227
228 struct pcc_keyinput {
229         struct acpi_hotkey      *hotkey;
230 };
231
232 /* method access functions */
233 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
234 {
235         union acpi_object in_objs[] = {
236                 { .integer.type  = ACPI_TYPE_INTEGER,
237                   .integer.value = func, },
238                 { .integer.type  = ACPI_TYPE_INTEGER,
239                   .integer.value = val, },
240         };
241         struct acpi_object_list params = {
242                 .count   = ARRAY_SIZE(in_objs),
243                 .pointer = in_objs,
244         };
245         acpi_status status = AE_OK;
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 long s;
256         acpi_status status;
257
258         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
259                                        NULL, &s);
260         if (ACPI_SUCCESS(status))
261                 return s;
262         else {
263                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
264                                   "evaluation error HKEY.SQTY\n"));
265                 return -EINVAL;
266         }
267 }
268
269 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
270 {
271         acpi_status status;
272         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
273         union acpi_object *hkey = NULL;
274         int i;
275
276         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
277                                       &buffer);
278         if (ACPI_FAILURE(status)) {
279                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
280                                   "evaluation error HKEY.SINF\n"));
281                 return 0;
282         }
283
284         hkey = buffer.pointer;
285         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
286                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
287                 goto end;
288         }
289
290         if (pcc->num_sifr < hkey->package.count) {
291                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
292                                  "SQTY reports bad SINF length\n"));
293                 status = AE_ERROR;
294                 goto end;
295         }
296
297         for (i = 0; i < hkey->package.count; i++) {
298                 union acpi_object *element = &(hkey->package.elements[i]);
299                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
300                         sinf[i] = element->integer.value;
301                 } else
302                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
303                                          "Invalid HKEY.SINF data\n"));
304         }
305         sinf[hkey->package.count] = -1;
306
307 end:
308         kfree(buffer.pointer);
309         return status == AE_OK;
310 }
311
312 /* backlight API interface functions */
313
314 /* This driver currently treats AC and DC brightness identical,
315  * since we don't need to invent an interface to the core ACPI
316  * logic to receive events in case a power supply is plugged in
317  * or removed */
318
319 static int bl_get(struct backlight_device *bd)
320 {
321         struct pcc_acpi *pcc = bl_get_data(bd);
322
323         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
324                 return -EIO;
325
326         return pcc->sinf[SINF_AC_CUR_BRIGHT];
327 }
328
329 static int bl_set_status(struct backlight_device *bd)
330 {
331         struct pcc_acpi *pcc = bl_get_data(bd);
332         int bright = bd->props.brightness;
333         int rc;
334
335         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
336                 return -EIO;
337
338         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
339                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
340
341         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
342                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
343
344         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
345             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
346                 return -EINVAL;
347
348         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
349         if (rc < 0)
350                 return rc;
351
352         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
353 }
354
355 static struct backlight_ops pcc_backlight_ops = {
356         .get_brightness = bl_get,
357         .update_status  = bl_set_status,
358 };
359
360
361 /* sysfs user interface functions */
362
363 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
364                             char *buf)
365 {
366         struct acpi_device *acpi = to_acpi_device(dev);
367         struct pcc_acpi *pcc = acpi_driver_data(acpi);
368
369         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
370                 return -EIO;
371
372         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
373 }
374
375 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
376                             char *buf)
377 {
378         struct acpi_device *acpi = to_acpi_device(dev);
379         struct pcc_acpi *pcc = acpi_driver_data(acpi);
380
381         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
382                 return -EIO;
383
384         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
385 }
386
387 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
388                          char *buf)
389 {
390         struct acpi_device *acpi = to_acpi_device(dev);
391         struct pcc_acpi *pcc = acpi_driver_data(acpi);
392
393         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
394                 return -EIO;
395
396         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
397 }
398
399 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
400                            char *buf)
401 {
402         struct acpi_device *acpi = to_acpi_device(dev);
403         struct pcc_acpi *pcc = acpi_driver_data(acpi);
404
405         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
406                 return -EIO;
407
408         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
409 }
410
411 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
412                           const char *buf, size_t count)
413 {
414         struct acpi_device *acpi = to_acpi_device(dev);
415         struct pcc_acpi *pcc = acpi_driver_data(acpi);
416         int val;
417
418         if (count && sscanf(buf, "%i", &val) == 1 &&
419             (val == 0 || val == 1)) {
420                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
421                 pcc->sticky_mode = val;
422         }
423
424         return count;
425 }
426
427 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
428 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
429 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
430 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
431
432 static struct attribute *pcc_sysfs_entries[] = {
433         &dev_attr_numbatt.attr,
434         &dev_attr_lcdtype.attr,
435         &dev_attr_mute.attr,
436         &dev_attr_sticky_key.attr,
437         NULL,
438 };
439
440 static struct attribute_group pcc_attr_group = {
441         .name   = NULL,         /* put in device directory */
442         .attrs  = pcc_sysfs_entries,
443 };
444
445
446 /* hotkey input device driver */
447
448 static int pcc_getkeycode(struct input_dev *dev,
449                           unsigned int scancode, unsigned int *keycode)
450 {
451         struct pcc_acpi *pcc = input_get_drvdata(dev);
452
453         if (scancode >= ARRAY_SIZE(pcc->keymap))
454                 return -EINVAL;
455
456         *keycode = pcc->keymap[scancode];
457
458         return 0;
459 }
460
461 static int keymap_get_by_keycode(struct pcc_acpi *pcc, unsigned int keycode)
462 {
463         int i;
464
465         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
466                 if (pcc->keymap[i] == keycode)
467                         return i+1;
468         }
469
470         return 0;
471 }
472
473 static int pcc_setkeycode(struct input_dev *dev,
474                           unsigned int scancode, unsigned int keycode)
475 {
476         struct pcc_acpi *pcc = input_get_drvdata(dev);
477         int oldkeycode;
478
479         if (scancode >= ARRAY_SIZE(pcc->keymap))
480                 return -EINVAL;
481
482         oldkeycode = pcc->keymap[scancode];
483         pcc->keymap[scancode] = keycode;
484
485         set_bit(keycode, dev->keybit);
486
487         if (!keymap_get_by_keycode(pcc, oldkeycode))
488                 clear_bit(oldkeycode, dev->keybit);
489
490         return 0;
491 }
492
493 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
494 {
495         struct input_dev *hotk_input_dev = pcc->input_dev;
496         int rc;
497         int key_code, hkey_num;
498         unsigned long long result;
499
500         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
501                                    NULL, &result);
502         if (!ACPI_SUCCESS(rc)) {
503                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
504                                  "error getting hotkey status\n"));
505                 return;
506         }
507
508         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
509
510         hkey_num = result & 0xf;
511
512         if (hkey_num < 0 || hkey_num >= ARRAY_SIZE(pcc->keymap)) {
513                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
514                                   "hotkey number out of range: %d\n",
515                                   hkey_num));
516                 return;
517         }
518
519         key_code = pcc->keymap[hkey_num];
520
521         if (key_code != KEY_RESERVED) {
522                 int pushed = (result & 0x80) ? TRUE : FALSE;
523
524                 input_report_key(hotk_input_dev, key_code, pushed);
525                 input_sync(hotk_input_dev);
526         }
527
528         return;
529 }
530
531 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
532 {
533         struct pcc_acpi *pcc = acpi_driver_data(device);
534
535         switch (event) {
536         case HKEY_NOTIFY:
537                 acpi_pcc_generate_keyinput(pcc);
538                 break;
539         default:
540                 /* nothing to do */
541                 break;
542         }
543 }
544
545 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
546 {
547         int i, rc;
548
549         pcc->input_dev = input_allocate_device();
550         if (!pcc->input_dev) {
551                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
552                                   "Couldn't allocate input device for hotkey"));
553                 return -ENOMEM;
554         }
555
556         pcc->input_dev->evbit[0] = BIT(EV_KEY);
557
558         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
559         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
560         pcc->input_dev->id.bustype = BUS_HOST;
561         pcc->input_dev->id.vendor = 0x0001;
562         pcc->input_dev->id.product = 0x0001;
563         pcc->input_dev->id.version = 0x0100;
564         pcc->input_dev->getkeycode = pcc_getkeycode;
565         pcc->input_dev->setkeycode = pcc_setkeycode;
566
567         /* load initial keymap */
568         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
569
570         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
571                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
572         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
573
574         input_set_drvdata(pcc->input_dev, pcc);
575
576         rc = input_register_device(pcc->input_dev);
577         if (rc < 0)
578                 input_free_device(pcc->input_dev);
579
580         return rc;
581 }
582
583 /* kernel module interface */
584
585 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
586 {
587         struct pcc_acpi *pcc = acpi_driver_data(device);
588         acpi_status status = AE_OK;
589
590         if (device == NULL || pcc == NULL)
591                 return -EINVAL;
592
593         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
594                           pcc->sticky_mode));
595
596         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
597
598         return status == AE_OK ? 0 : -EINVAL;
599 }
600
601 static int acpi_pcc_hotkey_add(struct acpi_device *device)
602 {
603         struct pcc_acpi *pcc;
604         int num_sifr, result;
605
606         if (!device)
607                 return -EINVAL;
608
609         num_sifr = acpi_pcc_get_sqty(device);
610
611         if (num_sifr > 255) {
612                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
613                 return -ENODEV;
614         }
615
616         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
617         if (!pcc) {
618                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
619                                   "Couldn't allocate mem for pcc"));
620                 return -ENOMEM;
621         }
622
623         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
624         if (!pcc->sinf) {
625                 result = -ENOMEM;
626                 goto out_hotkey;
627         }
628
629         pcc->device = device;
630         pcc->handle = device->handle;
631         pcc->num_sifr = num_sifr;
632         device->driver_data = pcc;
633         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
634         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
635
636         result = acpi_pcc_init_input(pcc);
637         if (result) {
638                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
639                                   "Error installing keyinput handler\n"));
640                 goto out_sinf;
641         }
642
643         /* initialize backlight */
644         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
645                                                    &pcc_backlight_ops);
646         if (IS_ERR(pcc->backlight))
647                 goto out_input;
648
649         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
650                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
651                                  "Couldn't retrieve BIOS data\n"));
652                 goto out_backlight;
653         }
654
655         /* read the initial brightness setting from the hardware */
656         pcc->backlight->props.max_brightness =
657                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
658         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
659
660         /* read the initial sticky key mode from the hardware */
661         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
662
663         /* add sysfs attributes */
664         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
665         if (result)
666                 goto out_backlight;
667
668         return 0;
669
670 out_backlight:
671         backlight_device_unregister(pcc->backlight);
672 out_input:
673         input_unregister_device(pcc->input_dev);
674         /* no need to input_free_device() since core input API refcount and
675          * free()s the device */
676 out_sinf:
677         kfree(pcc->sinf);
678 out_hotkey:
679         kfree(pcc);
680
681         return result;
682 }
683
684 static int __init acpi_pcc_init(void)
685 {
686         int result = 0;
687
688         if (acpi_disabled)
689                 return -ENODEV;
690
691         result = acpi_bus_register_driver(&acpi_pcc_driver);
692         if (result < 0) {
693                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
694                                   "Error registering hotkey driver\n"));
695                 return -ENODEV;
696         }
697
698         return 0;
699 }
700
701 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
702 {
703         struct pcc_acpi *pcc = acpi_driver_data(device);
704
705         if (!device || !pcc)
706                 return -EINVAL;
707
708         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
709
710         backlight_device_unregister(pcc->backlight);
711
712         input_unregister_device(pcc->input_dev);
713         /* no need to input_free_device() since core input API refcount and
714          * free()s the device */
715
716         kfree(pcc->sinf);
717         kfree(pcc);
718
719         return 0;
720 }
721
722 static void __exit acpi_pcc_exit(void)
723 {
724         acpi_bus_unregister_driver(&acpi_pcc_driver);
725 }
726
727 module_init(acpi_pcc_init);
728 module_exit(acpi_pcc_exit);