Merge branch 'drivers-platform' into release
[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
180 static const struct acpi_device_id pcc_device_ids[] = {
181         { "MAT0012", 0},
182         { "MAT0013", 0},
183         { "MAT0018", 0},
184         { "MAT0019", 0},
185         { "", 0},
186 };
187
188 static struct acpi_driver acpi_pcc_driver = {
189         .name =         ACPI_PCC_DRIVER_NAME,
190         .class =        ACPI_PCC_CLASS,
191         .ids =          pcc_device_ids,
192         .ops =          {
193                                 .add =          acpi_pcc_hotkey_add,
194                                 .remove =       acpi_pcc_hotkey_remove,
195                                 .resume =       acpi_pcc_hotkey_resume,
196                         },
197 };
198
199 #define KEYMAP_SIZE             11
200 static const int initial_keymap[KEYMAP_SIZE] = {
201         /*  0 */ KEY_RESERVED,
202         /*  1 */ KEY_BRIGHTNESSDOWN,
203         /*  2 */ KEY_BRIGHTNESSUP,
204         /*  3 */ KEY_DISPLAYTOGGLE,
205         /*  4 */ KEY_MUTE,
206         /*  5 */ KEY_VOLUMEDOWN,
207         /*  6 */ KEY_VOLUMEUP,
208         /*  7 */ KEY_SLEEP,
209         /*  8 */ KEY_PROG1, /* Change CPU boost */
210         /*  9 */ KEY_BATTERY,
211         /* 10 */ KEY_SUSPEND,
212 };
213
214 struct pcc_acpi {
215         acpi_handle             handle;
216         unsigned long           num_sifr;
217         int                     sticky_mode;
218         u32                     *sinf;
219         struct acpi_device      *device;
220         struct input_dev        *input_dev;
221         struct backlight_device *backlight;
222         int                     keymap[KEYMAP_SIZE];
223 };
224
225 struct pcc_keyinput {
226         struct acpi_hotkey      *hotkey;
227 };
228
229 /* method access functions */
230 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
231 {
232         union acpi_object in_objs[] = {
233                 { .integer.type  = ACPI_TYPE_INTEGER,
234                   .integer.value = func, },
235                 { .integer.type  = ACPI_TYPE_INTEGER,
236                   .integer.value = val, },
237         };
238         struct acpi_object_list params = {
239                 .count   = ARRAY_SIZE(in_objs),
240                 .pointer = in_objs,
241         };
242         acpi_status status = AE_OK;
243
244         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
245                                       &params, NULL);
246
247         return status == AE_OK;
248 }
249
250 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
251 {
252         unsigned long long s;
253         acpi_status status;
254
255         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
256                                        NULL, &s);
257         if (ACPI_SUCCESS(status))
258                 return s;
259         else {
260                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
261                                   "evaluation error HKEY.SQTY\n"));
262                 return -EINVAL;
263         }
264 }
265
266 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
267 {
268         acpi_status status;
269         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
270         union acpi_object *hkey = NULL;
271         int i;
272
273         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
274                                       &buffer);
275         if (ACPI_FAILURE(status)) {
276                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
277                                   "evaluation error HKEY.SINF\n"));
278                 return 0;
279         }
280
281         hkey = buffer.pointer;
282         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
283                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
284                 goto end;
285         }
286
287         if (pcc->num_sifr < hkey->package.count) {
288                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
289                                  "SQTY reports bad SINF length\n"));
290                 status = AE_ERROR;
291                 goto end;
292         }
293
294         for (i = 0; i < hkey->package.count; i++) {
295                 union acpi_object *element = &(hkey->package.elements[i]);
296                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
297                         sinf[i] = element->integer.value;
298                 } else
299                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
300                                          "Invalid HKEY.SINF data\n"));
301         }
302         sinf[hkey->package.count] = -1;
303
304 end:
305         kfree(buffer.pointer);
306         return status == AE_OK;
307 }
308
309 /* backlight API interface functions */
310
311 /* This driver currently treats AC and DC brightness identical,
312  * since we don't need to invent an interface to the core ACPI
313  * logic to receive events in case a power supply is plugged in
314  * or removed */
315
316 static int bl_get(struct backlight_device *bd)
317 {
318         struct pcc_acpi *pcc = bl_get_data(bd);
319
320         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
321                 return -EIO;
322
323         return pcc->sinf[SINF_AC_CUR_BRIGHT];
324 }
325
326 static int bl_set_status(struct backlight_device *bd)
327 {
328         struct pcc_acpi *pcc = bl_get_data(bd);
329         int bright = bd->props.brightness;
330         int rc;
331
332         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
333                 return -EIO;
334
335         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
336                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
337
338         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
339                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
340
341         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
342             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
343                 return -EINVAL;
344
345         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
346         if (rc < 0)
347                 return rc;
348
349         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
350 }
351
352 static struct backlight_ops pcc_backlight_ops = {
353         .get_brightness = bl_get,
354         .update_status  = bl_set_status,
355 };
356
357
358 /* sysfs user interface functions */
359
360 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
361                             char *buf)
362 {
363         struct acpi_device *acpi = to_acpi_device(dev);
364         struct pcc_acpi *pcc = acpi_driver_data(acpi);
365
366         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
367                 return -EIO;
368
369         return sprintf(buf, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
370 }
371
372 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
373                             char *buf)
374 {
375         struct acpi_device *acpi = to_acpi_device(dev);
376         struct pcc_acpi *pcc = acpi_driver_data(acpi);
377
378         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
379                 return -EIO;
380
381         return sprintf(buf, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
382 }
383
384 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
385                          char *buf)
386 {
387         struct acpi_device *acpi = to_acpi_device(dev);
388         struct pcc_acpi *pcc = acpi_driver_data(acpi);
389
390         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
391                 return -EIO;
392
393         return sprintf(buf, "%u\n", pcc->sinf[SINF_MUTE]);
394 }
395
396 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
397                            char *buf)
398 {
399         struct acpi_device *acpi = to_acpi_device(dev);
400         struct pcc_acpi *pcc = acpi_driver_data(acpi);
401
402         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
403                 return -EIO;
404
405         return sprintf(buf, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
406 }
407
408 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
409                           const char *buf, size_t count)
410 {
411         struct acpi_device *acpi = to_acpi_device(dev);
412         struct pcc_acpi *pcc = acpi_driver_data(acpi);
413         int val;
414
415         if (count && sscanf(buf, "%i", &val) == 1 &&
416             (val == 0 || val == 1)) {
417                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
418                 pcc->sticky_mode = val;
419         }
420
421         return count;
422 }
423
424 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
425 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
426 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
427 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
428
429 static struct attribute *pcc_sysfs_entries[] = {
430         &dev_attr_numbatt.attr,
431         &dev_attr_lcdtype.attr,
432         &dev_attr_mute.attr,
433         &dev_attr_sticky_key.attr,
434         NULL,
435 };
436
437 static struct attribute_group pcc_attr_group = {
438         .name   = NULL,         /* put in device directory */
439         .attrs  = pcc_sysfs_entries,
440 };
441
442
443 /* hotkey input device driver */
444
445 static int pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
446 {
447         struct pcc_acpi *pcc = input_get_drvdata(dev);
448
449         if (scancode >= ARRAY_SIZE(pcc->keymap))
450                 return -EINVAL;
451
452         *keycode = pcc->keymap[scancode];
453
454         return 0;
455 }
456
457 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
458 {
459         int i;
460
461         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
462                 if (pcc->keymap[i] == keycode)
463                         return i+1;
464         }
465
466         return 0;
467 }
468
469 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
470 {
471         struct pcc_acpi *pcc = input_get_drvdata(dev);
472         int oldkeycode;
473
474         if (scancode >= ARRAY_SIZE(pcc->keymap))
475                 return -EINVAL;
476
477         if (keycode < 0 || keycode > KEY_MAX)
478                 return -EINVAL;
479
480         oldkeycode = pcc->keymap[scancode];
481         pcc->keymap[scancode] = keycode;
482
483         set_bit(keycode, dev->keybit);
484
485         if (!keymap_get_by_keycode(pcc, oldkeycode))
486                 clear_bit(oldkeycode, dev->keybit);
487
488         return 0;
489 }
490
491 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
492 {
493         struct input_dev *hotk_input_dev = pcc->input_dev;
494         int rc;
495         int key_code, hkey_num;
496         unsigned long long result;
497
498         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
499                                    NULL, &result);
500         if (!ACPI_SUCCESS(rc)) {
501                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
502                                  "error getting hotkey status\n"));
503                 return;
504         }
505
506         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
507
508         hkey_num = result & 0xf;
509
510         if (hkey_num < 0 || hkey_num > ARRAY_SIZE(pcc->keymap)) {
511                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
512                                   "hotkey number out of range: %d\n",
513                                   hkey_num));
514                 return;
515         }
516
517         key_code = pcc->keymap[hkey_num];
518
519         if (key_code != KEY_RESERVED) {
520                 int pushed = (result & 0x80) ? TRUE : FALSE;
521
522                 input_report_key(hotk_input_dev, key_code, pushed);
523                 input_sync(hotk_input_dev);
524         }
525
526         return;
527 }
528
529 static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
530 {
531         struct pcc_acpi *pcc = (struct pcc_acpi *) data;
532
533         switch (event) {
534         case HKEY_NOTIFY:
535                 acpi_pcc_generate_keyinput(pcc);
536                 break;
537         default:
538                 /* nothing to do */
539                 break;
540         }
541 }
542
543 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
544 {
545         int i, rc;
546
547         pcc->input_dev = input_allocate_device();
548         if (!pcc->input_dev) {
549                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
550                                   "Couldn't allocate input device for hotkey"));
551                 return -ENOMEM;
552         }
553
554         pcc->input_dev->evbit[0] = BIT(EV_KEY);
555
556         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
557         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
558         pcc->input_dev->id.bustype = BUS_HOST;
559         pcc->input_dev->id.vendor = 0x0001;
560         pcc->input_dev->id.product = 0x0001;
561         pcc->input_dev->id.version = 0x0100;
562         pcc->input_dev->getkeycode = pcc_getkeycode;
563         pcc->input_dev->setkeycode = pcc_setkeycode;
564
565         /* load initial keymap */
566         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
567
568         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
569                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
570         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
571
572         input_set_drvdata(pcc->input_dev, pcc);
573
574         rc = input_register_device(pcc->input_dev);
575         if (rc < 0)
576                 input_free_device(pcc->input_dev);
577
578         return rc;
579 }
580
581 /* kernel module interface */
582
583 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
584 {
585         struct pcc_acpi *pcc = acpi_driver_data(device);
586         acpi_status status = AE_OK;
587
588         if (device == NULL || pcc == NULL)
589                 return -EINVAL;
590
591         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
592                           pcc->sticky_mode));
593
594         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
595
596         return status == AE_OK ? 0 : -EINVAL;
597 }
598
599 static int acpi_pcc_hotkey_add(struct acpi_device *device)
600 {
601         acpi_status status;
602         struct pcc_acpi *pcc;
603         int num_sifr, result;
604
605         if (!device)
606                 return -EINVAL;
607
608         num_sifr = acpi_pcc_get_sqty(device);
609
610         if (num_sifr > 255) {
611                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
612                 return -ENODEV;
613         }
614
615         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
616         if (!pcc) {
617                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
618                                   "Couldn't allocate mem for pcc"));
619                 return -ENOMEM;
620         }
621
622         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
623         if (!pcc->sinf) {
624                 result = -ENOMEM;
625                 goto out_hotkey;
626         }
627
628         pcc->device = device;
629         pcc->handle = device->handle;
630         pcc->num_sifr = num_sifr;
631         device->driver_data = pcc;
632         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
633         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
634
635         result = acpi_pcc_init_input(pcc);
636         if (result) {
637                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
638                                   "Error installing keyinput handler\n"));
639                 goto out_sinf;
640         }
641
642         /* initialize hotkey input device */
643         status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
644                                              acpi_pcc_hotkey_notify, pcc);
645
646         if (ACPI_FAILURE(status)) {
647                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
648                                   "Error installing notify handler\n"));
649                 result = -ENODEV;
650                 goto out_input;
651         }
652
653         /* initialize backlight */
654         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
655                                                    &pcc_backlight_ops);
656         if (IS_ERR(pcc->backlight))
657                 goto out_notify;
658
659         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
660                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
661                                  "Couldn't retrieve BIOS data\n"));
662                 goto out_backlight;
663         }
664
665         /* read the initial brightness setting from the hardware */
666         pcc->backlight->props.max_brightness =
667                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
668         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
669
670         /* read the initial sticky key mode from the hardware */
671         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
672
673         /* add sysfs attributes */
674         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
675         if (result)
676                 goto out_backlight;
677
678         return 0;
679
680 out_backlight:
681         backlight_device_unregister(pcc->backlight);
682 out_notify:
683         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
684                                    acpi_pcc_hotkey_notify);
685 out_input:
686         input_unregister_device(pcc->input_dev);
687         /* no need to input_free_device() since core input API refcount and
688          * free()s the device */
689 out_sinf:
690         kfree(pcc->sinf);
691 out_hotkey:
692         kfree(pcc);
693
694         return result;
695 }
696
697 static int __init acpi_pcc_init(void)
698 {
699         int result = 0;
700
701         if (acpi_disabled)
702                 return -ENODEV;
703
704         result = acpi_bus_register_driver(&acpi_pcc_driver);
705         if (result < 0) {
706                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
707                                   "Error registering hotkey driver\n"));
708                 return -ENODEV;
709         }
710
711         return 0;
712 }
713
714 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
715 {
716         struct pcc_acpi *pcc = acpi_driver_data(device);
717
718         if (!device || !pcc)
719                 return -EINVAL;
720
721         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
722
723         backlight_device_unregister(pcc->backlight);
724
725         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
726                                    acpi_pcc_hotkey_notify);
727
728         input_unregister_device(pcc->input_dev);
729         /* no need to input_free_device() since core input API refcount and
730          * free()s the device */
731
732         kfree(pcc->sinf);
733         kfree(pcc);
734
735         return 0;
736 }
737
738 static void __exit acpi_pcc_exit(void)
739 {
740         acpi_bus_unregister_driver(&acpi_pcc_driver);
741 }
742
743 module_init(acpi_pcc_init);
744 module_exit(acpi_pcc_exit);