NULL noise: drivers/platform/x86/panasonic-laptop.c
[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 MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
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         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
246                                       &params, NULL);
247
248         return status == AE_OK;
249 }
250
251 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
252 {
253         unsigned long long s;
254         acpi_status status;
255
256         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
257                                        NULL, &s);
258         if (ACPI_SUCCESS(status))
259                 return s;
260         else {
261                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
262                                   "evaluation error HKEY.SQTY\n"));
263                 return -EINVAL;
264         }
265 }
266
267 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
268 {
269         acpi_status status;
270         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
271         union acpi_object *hkey = NULL;
272         int i;
273
274         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
275                                       &buffer);
276         if (ACPI_FAILURE(status)) {
277                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
278                                   "evaluation error HKEY.SINF\n"));
279                 return 0;
280         }
281
282         hkey = buffer.pointer;
283         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
284                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
285                 goto end;
286         }
287
288         if (pcc->num_sifr < hkey->package.count) {
289                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
290                                  "SQTY reports bad SINF length\n"));
291                 status = AE_ERROR;
292                 goto end;
293         }
294
295         for (i = 0; i < hkey->package.count; i++) {
296                 union acpi_object *element = &(hkey->package.elements[i]);
297                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
298                         sinf[i] = element->integer.value;
299                 } else
300                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
301                                          "Invalid HKEY.SINF data\n"));
302         }
303         sinf[hkey->package.count] = -1;
304
305 end:
306         kfree(buffer.pointer);
307         return status == AE_OK;
308 }
309
310 /* backlight API interface functions */
311
312 /* This driver currently treats AC and DC brightness identical,
313  * since we don't need to invent an interface to the core ACPI
314  * logic to receive events in case a power supply is plugged in
315  * or removed */
316
317 static int bl_get(struct backlight_device *bd)
318 {
319         struct pcc_acpi *pcc = bl_get_data(bd);
320
321         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
322                 return -EIO;
323
324         return pcc->sinf[SINF_AC_CUR_BRIGHT];
325 }
326
327 static int bl_set_status(struct backlight_device *bd)
328 {
329         struct pcc_acpi *pcc = bl_get_data(bd);
330         int bright = bd->props.brightness;
331         int rc;
332
333         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
334                 return -EIO;
335
336         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
337                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
338
339         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
340                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
341
342         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
343             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
344                 return -EINVAL;
345
346         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
347         if (rc < 0)
348                 return rc;
349
350         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
351 }
352
353 static struct backlight_ops pcc_backlight_ops = {
354         .get_brightness = bl_get,
355         .update_status  = bl_set_status,
356 };
357
358
359 /* sysfs user interface functions */
360
361 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
362                             char *buf)
363 {
364         struct acpi_device *acpi = to_acpi_device(dev);
365         struct pcc_acpi *pcc = acpi_driver_data(acpi);
366
367         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
368                 return -EIO;
369
370         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
371 }
372
373 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
374                             char *buf)
375 {
376         struct acpi_device *acpi = to_acpi_device(dev);
377         struct pcc_acpi *pcc = acpi_driver_data(acpi);
378
379         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
380                 return -EIO;
381
382         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
383 }
384
385 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
386                          char *buf)
387 {
388         struct acpi_device *acpi = to_acpi_device(dev);
389         struct pcc_acpi *pcc = acpi_driver_data(acpi);
390
391         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
392                 return -EIO;
393
394         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
395 }
396
397 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
398                            char *buf)
399 {
400         struct acpi_device *acpi = to_acpi_device(dev);
401         struct pcc_acpi *pcc = acpi_driver_data(acpi);
402
403         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
404                 return -EIO;
405
406         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
407 }
408
409 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
410                           const char *buf, size_t count)
411 {
412         struct acpi_device *acpi = to_acpi_device(dev);
413         struct pcc_acpi *pcc = acpi_driver_data(acpi);
414         int val;
415
416         if (count && sscanf(buf, "%i", &val) == 1 &&
417             (val == 0 || val == 1)) {
418                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
419                 pcc->sticky_mode = val;
420         }
421
422         return count;
423 }
424
425 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
426 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
427 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
428 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
429
430 static struct attribute *pcc_sysfs_entries[] = {
431         &dev_attr_numbatt.attr,
432         &dev_attr_lcdtype.attr,
433         &dev_attr_mute.attr,
434         &dev_attr_sticky_key.attr,
435         NULL,
436 };
437
438 static struct attribute_group pcc_attr_group = {
439         .name   = NULL,         /* put in device directory */
440         .attrs  = pcc_sysfs_entries,
441 };
442
443
444 /* hotkey input device driver */
445
446 static int pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
447 {
448         struct pcc_acpi *pcc = input_get_drvdata(dev);
449
450         if (scancode >= ARRAY_SIZE(pcc->keymap))
451                 return -EINVAL;
452
453         *keycode = pcc->keymap[scancode];
454
455         return 0;
456 }
457
458 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
459 {
460         int i;
461
462         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
463                 if (pcc->keymap[i] == keycode)
464                         return i+1;
465         }
466
467         return 0;
468 }
469
470 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
471 {
472         struct pcc_acpi *pcc = input_get_drvdata(dev);
473         int oldkeycode;
474
475         if (scancode >= ARRAY_SIZE(pcc->keymap))
476                 return -EINVAL;
477
478         if (keycode < 0 || keycode > KEY_MAX)
479                 return -EINVAL;
480
481         oldkeycode = pcc->keymap[scancode];
482         pcc->keymap[scancode] = keycode;
483
484         set_bit(keycode, dev->keybit);
485
486         if (!keymap_get_by_keycode(pcc, oldkeycode))
487                 clear_bit(oldkeycode, dev->keybit);
488
489         return 0;
490 }
491
492 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
493 {
494         struct input_dev *hotk_input_dev = pcc->input_dev;
495         int rc;
496         int key_code, hkey_num;
497         unsigned long long result;
498
499         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
500                                    NULL, &result);
501         if (!ACPI_SUCCESS(rc)) {
502                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
503                                  "error getting hotkey status\n"));
504                 return;
505         }
506
507         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
508
509         hkey_num = result & 0xf;
510
511         if (hkey_num < 0 || hkey_num >= ARRAY_SIZE(pcc->keymap)) {
512                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
513                                   "hotkey number out of range: %d\n",
514                                   hkey_num));
515                 return;
516         }
517
518         key_code = pcc->keymap[hkey_num];
519
520         if (key_code != KEY_RESERVED) {
521                 int pushed = (result & 0x80) ? TRUE : FALSE;
522
523                 input_report_key(hotk_input_dev, key_code, pushed);
524                 input_sync(hotk_input_dev);
525         }
526
527         return;
528 }
529
530 static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
531 {
532         struct pcc_acpi *pcc = (struct pcc_acpi *) data;
533
534         switch (event) {
535         case HKEY_NOTIFY:
536                 acpi_pcc_generate_keyinput(pcc);
537                 break;
538         default:
539                 /* nothing to do */
540                 break;
541         }
542 }
543
544 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
545 {
546         int i, rc;
547
548         pcc->input_dev = input_allocate_device();
549         if (!pcc->input_dev) {
550                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
551                                   "Couldn't allocate input device for hotkey"));
552                 return -ENOMEM;
553         }
554
555         pcc->input_dev->evbit[0] = BIT(EV_KEY);
556
557         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
558         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
559         pcc->input_dev->id.bustype = BUS_HOST;
560         pcc->input_dev->id.vendor = 0x0001;
561         pcc->input_dev->id.product = 0x0001;
562         pcc->input_dev->id.version = 0x0100;
563         pcc->input_dev->getkeycode = pcc_getkeycode;
564         pcc->input_dev->setkeycode = pcc_setkeycode;
565
566         /* load initial keymap */
567         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
568
569         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
570                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
571         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
572
573         input_set_drvdata(pcc->input_dev, pcc);
574
575         rc = input_register_device(pcc->input_dev);
576         if (rc < 0)
577                 input_free_device(pcc->input_dev);
578
579         return rc;
580 }
581
582 /* kernel module interface */
583
584 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
585 {
586         struct pcc_acpi *pcc = acpi_driver_data(device);
587         acpi_status status = AE_OK;
588
589         if (device == NULL || pcc == NULL)
590                 return -EINVAL;
591
592         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
593                           pcc->sticky_mode));
594
595         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
596
597         return status == AE_OK ? 0 : -EINVAL;
598 }
599
600 static int acpi_pcc_hotkey_add(struct acpi_device *device)
601 {
602         acpi_status status;
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 hotkey input device */
644         status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
645                                              acpi_pcc_hotkey_notify, pcc);
646
647         if (ACPI_FAILURE(status)) {
648                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
649                                   "Error installing notify handler\n"));
650                 result = -ENODEV;
651                 goto out_input;
652         }
653
654         /* initialize backlight */
655         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
656                                                    &pcc_backlight_ops);
657         if (IS_ERR(pcc->backlight))
658                 goto out_notify;
659
660         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
661                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
662                                  "Couldn't retrieve BIOS data\n"));
663                 goto out_backlight;
664         }
665
666         /* read the initial brightness setting from the hardware */
667         pcc->backlight->props.max_brightness =
668                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
669         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
670
671         /* read the initial sticky key mode from the hardware */
672         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
673
674         /* add sysfs attributes */
675         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
676         if (result)
677                 goto out_backlight;
678
679         return 0;
680
681 out_backlight:
682         backlight_device_unregister(pcc->backlight);
683 out_notify:
684         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
685                                    acpi_pcc_hotkey_notify);
686 out_input:
687         input_unregister_device(pcc->input_dev);
688         /* no need to input_free_device() since core input API refcount and
689          * free()s the device */
690 out_sinf:
691         kfree(pcc->sinf);
692 out_hotkey:
693         kfree(pcc);
694
695         return result;
696 }
697
698 static int __init acpi_pcc_init(void)
699 {
700         int result = 0;
701
702         if (acpi_disabled)
703                 return -ENODEV;
704
705         result = acpi_bus_register_driver(&acpi_pcc_driver);
706         if (result < 0) {
707                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
708                                   "Error registering hotkey driver\n"));
709                 return -ENODEV;
710         }
711
712         return 0;
713 }
714
715 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
716 {
717         struct pcc_acpi *pcc = acpi_driver_data(device);
718
719         if (!device || !pcc)
720                 return -EINVAL;
721
722         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
723
724         backlight_device_unregister(pcc->backlight);
725
726         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
727                                    acpi_pcc_hotkey_notify);
728
729         input_unregister_device(pcc->input_dev);
730         /* no need to input_free_device() since core input API refcount and
731          * free()s the device */
732
733         kfree(pcc->sinf);
734         kfree(pcc);
735
736         return 0;
737 }
738
739 static void __exit acpi_pcc_exit(void)
740 {
741         acpi_bus_unregister_driver(&acpi_pcc_driver);
742 }
743
744 module_init(acpi_pcc_init);
745 module_exit(acpi_pcc_exit);