Merge commit 'v2.6.28-rc8' into x86/mm
[linux-2.6] / 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/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         ACPI_FUNCTION_TRACE("acpi_pcc_write_sset");
245
246         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
247                                       &params, NULL);
248
249         return status == AE_OK;
250 }
251
252 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
253 {
254         unsigned long long s;
255         acpi_status status;
256
257         ACPI_FUNCTION_TRACE("acpi_pcc_get_sqty");
258
259         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
260                                        NULL, &s);
261         if (ACPI_SUCCESS(status))
262                 return s;
263         else {
264                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
265                                   "evaluation error HKEY.SQTY\n"));
266                 return -EINVAL;
267         }
268 }
269
270 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
271 {
272         acpi_status status;
273         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
274         union acpi_object *hkey = NULL;
275         int i;
276
277         ACPI_FUNCTION_TRACE("acpi_pcc_retrieve_biosdata");
278
279         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
280                                       &buffer);
281         if (ACPI_FAILURE(status)) {
282                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
283                                   "evaluation error HKEY.SINF\n"));
284                 return 0;
285         }
286
287         hkey = buffer.pointer;
288         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
289                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
290                 goto end;
291         }
292
293         if (pcc->num_sifr < hkey->package.count) {
294                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
295                                  "SQTY reports bad SINF length\n"));
296                 status = AE_ERROR;
297                 goto end;
298         }
299
300         for (i = 0; i < hkey->package.count; i++) {
301                 union acpi_object *element = &(hkey->package.elements[i]);
302                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
303                         sinf[i] = element->integer.value;
304                 } else
305                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
306                                          "Invalid HKEY.SINF data\n"));
307         }
308         sinf[hkey->package.count] = -1;
309
310 end:
311         kfree(buffer.pointer);
312         return status == AE_OK;
313 }
314
315 /* backlight API interface functions */
316
317 /* This driver currently treats AC and DC brightness identical,
318  * since we don't need to invent an interface to the core ACPI
319  * logic to receive events in case a power supply is plugged in
320  * or removed */
321
322 static int bl_get(struct backlight_device *bd)
323 {
324         struct pcc_acpi *pcc = bl_get_data(bd);
325
326         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
327                 return -EIO;
328
329         return pcc->sinf[SINF_AC_CUR_BRIGHT];
330 }
331
332 static int bl_set_status(struct backlight_device *bd)
333 {
334         struct pcc_acpi *pcc = bl_get_data(bd);
335         int bright = bd->props.brightness;
336         int rc;
337
338         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
339                 return -EIO;
340
341         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
342                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
343
344         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
345                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
346
347         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
348             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
349                 return -EINVAL;
350
351         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
352         if (rc < 0)
353                 return rc;
354
355         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
356 }
357
358 static struct backlight_ops pcc_backlight_ops = {
359         .get_brightness = bl_get,
360         .update_status  = bl_set_status,
361 };
362
363
364 /* sysfs user interface functions */
365
366 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
367                             char *buf)
368 {
369         struct acpi_device *acpi = to_acpi_device(dev);
370         struct pcc_acpi *pcc = acpi_driver_data(acpi);
371
372         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
373                 return -EIO;
374
375         return sprintf(buf, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
376 }
377
378 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
379                             char *buf)
380 {
381         struct acpi_device *acpi = to_acpi_device(dev);
382         struct pcc_acpi *pcc = acpi_driver_data(acpi);
383
384         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
385                 return -EIO;
386
387         return sprintf(buf, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
388 }
389
390 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
391                          char *buf)
392 {
393         struct acpi_device *acpi = to_acpi_device(dev);
394         struct pcc_acpi *pcc = acpi_driver_data(acpi);
395
396         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
397                 return -EIO;
398
399         return sprintf(buf, "%u\n", pcc->sinf[SINF_MUTE]);
400 }
401
402 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
403                            char *buf)
404 {
405         struct acpi_device *acpi = to_acpi_device(dev);
406         struct pcc_acpi *pcc = acpi_driver_data(acpi);
407
408         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
409                 return -EIO;
410
411         return sprintf(buf, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
412 }
413
414 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
415                           const char *buf, size_t count)
416 {
417         struct acpi_device *acpi = to_acpi_device(dev);
418         struct pcc_acpi *pcc = acpi_driver_data(acpi);
419         int val;
420
421         if (count && sscanf(buf, "%i", &val) == 1 &&
422             (val == 0 || val == 1)) {
423                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
424                 pcc->sticky_mode = val;
425         }
426
427         return count;
428 }
429
430 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
431 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
432 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
433 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
434
435 static struct attribute *pcc_sysfs_entries[] = {
436         &dev_attr_numbatt.attr,
437         &dev_attr_lcdtype.attr,
438         &dev_attr_mute.attr,
439         &dev_attr_sticky_key.attr,
440         NULL,
441 };
442
443 static struct attribute_group pcc_attr_group = {
444         .name   = NULL,         /* put in device directory */
445         .attrs  = pcc_sysfs_entries,
446 };
447
448
449 /* hotkey input device driver */
450
451 static int pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
452 {
453         struct pcc_acpi *pcc = input_get_drvdata(dev);
454
455         if (scancode >= ARRAY_SIZE(pcc->keymap))
456                 return -EINVAL;
457
458         *keycode = pcc->keymap[scancode];
459
460         return 0;
461 }
462
463 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
464 {
465         int i;
466
467         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
468                 if (pcc->keymap[i] == keycode)
469                         return i+1;
470         }
471
472         return 0;
473 }
474
475 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
476 {
477         struct pcc_acpi *pcc = input_get_drvdata(dev);
478         int oldkeycode;
479
480         if (scancode >= ARRAY_SIZE(pcc->keymap))
481                 return -EINVAL;
482
483         if (keycode < 0 || keycode > KEY_MAX)
484                 return -EINVAL;
485
486         oldkeycode = pcc->keymap[scancode];
487         pcc->keymap[scancode] = keycode;
488
489         set_bit(keycode, dev->keybit);
490
491         if (!keymap_get_by_keycode(pcc, oldkeycode))
492                 clear_bit(oldkeycode, dev->keybit);
493
494         return 0;
495 }
496
497 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
498 {
499         struct input_dev *hotk_input_dev = pcc->input_dev;
500         int rc;
501         int key_code, hkey_num;
502         unsigned long long result;
503
504         ACPI_FUNCTION_TRACE("acpi_pcc_generate_keyinput");
505
506         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
507                                    NULL, &result);
508         if (!ACPI_SUCCESS(rc)) {
509                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
510                                  "error getting hotkey status\n"));
511                 return;
512         }
513
514         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
515
516         hkey_num = result & 0xf;
517
518         if (hkey_num < 0 || hkey_num > ARRAY_SIZE(pcc->keymap)) {
519                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
520                                   "hotkey number out of range: %d\n",
521                                   hkey_num));
522                 return;
523         }
524
525         key_code = pcc->keymap[hkey_num];
526
527         if (key_code != KEY_RESERVED) {
528                 int pushed = (result & 0x80) ? TRUE : FALSE;
529
530                 input_report_key(hotk_input_dev, key_code, pushed);
531                 input_sync(hotk_input_dev);
532         }
533
534         return;
535 }
536
537 static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
538 {
539         struct pcc_acpi *pcc = (struct pcc_acpi *) data;
540
541         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_notify");
542
543         switch (event) {
544         case HKEY_NOTIFY:
545                 acpi_pcc_generate_keyinput(pcc);
546                 break;
547         default:
548                 /* nothing to do */
549                 break;
550         }
551 }
552
553 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
554 {
555         int i, rc;
556
557         ACPI_FUNCTION_TRACE("acpi_pcc_init_input");
558
559         pcc->input_dev = input_allocate_device();
560         if (!pcc->input_dev) {
561                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
562                                   "Couldn't allocate input device for hotkey"));
563                 return -ENOMEM;
564         }
565
566         pcc->input_dev->evbit[0] = BIT(EV_KEY);
567
568         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
569         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
570         pcc->input_dev->id.bustype = BUS_HOST;
571         pcc->input_dev->id.vendor = 0x0001;
572         pcc->input_dev->id.product = 0x0001;
573         pcc->input_dev->id.version = 0x0100;
574         pcc->input_dev->getkeycode = pcc_getkeycode;
575         pcc->input_dev->setkeycode = pcc_setkeycode;
576
577         /* load initial keymap */
578         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
579
580         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
581                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
582         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
583
584         input_set_drvdata(pcc->input_dev, pcc);
585
586         rc = input_register_device(pcc->input_dev);
587         if (rc < 0)
588                 input_free_device(pcc->input_dev);
589
590         return rc;
591 }
592
593 /* kernel module interface */
594
595 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
596 {
597         struct pcc_acpi *pcc = acpi_driver_data(device);
598         acpi_status status = AE_OK;
599
600         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_resume");
601
602         if (device == NULL || pcc == NULL)
603                 return -EINVAL;
604
605         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
606                           pcc->sticky_mode));
607
608         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
609
610         return status == AE_OK ? 0 : -EINVAL;
611 }
612
613 static int acpi_pcc_hotkey_add(struct acpi_device *device)
614 {
615         acpi_status status;
616         struct pcc_acpi *pcc;
617         int num_sifr, result;
618
619         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_add");
620
621         if (!device)
622                 return -EINVAL;
623
624         num_sifr = acpi_pcc_get_sqty(device);
625
626         if (num_sifr > 255) {
627                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
628                 return -ENODEV;
629         }
630
631         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
632         if (!pcc) {
633                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
634                                   "Couldn't allocate mem for pcc"));
635                 return -ENOMEM;
636         }
637
638         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
639         if (!pcc->sinf) {
640                 result = -ENOMEM;
641                 goto out_hotkey;
642         }
643
644         pcc->device = device;
645         pcc->handle = device->handle;
646         pcc->num_sifr = num_sifr;
647         device->driver_data = pcc;
648         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
649         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
650
651         result = acpi_pcc_init_input(pcc);
652         if (result) {
653                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
654                                   "Error installing keyinput handler\n"));
655                 goto out_sinf;
656         }
657
658         /* initialize hotkey input device */
659         status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
660                                              acpi_pcc_hotkey_notify, pcc);
661
662         if (ACPI_FAILURE(status)) {
663                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
664                                   "Error installing notify handler\n"));
665                 result = -ENODEV;
666                 goto out_input;
667         }
668
669         /* initialize backlight */
670         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
671                                                    &pcc_backlight_ops);
672         if (IS_ERR(pcc->backlight))
673                 goto out_notify;
674
675         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
676                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
677                                  "Couldn't retrieve BIOS data\n"));
678                 goto out_backlight;
679         }
680
681         /* read the initial brightness setting from the hardware */
682         pcc->backlight->props.max_brightness =
683                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
684         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
685
686         /* read the initial sticky key mode from the hardware */
687         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
688
689         /* add sysfs attributes */
690         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
691         if (result)
692                 goto out_backlight;
693
694         return 0;
695
696 out_backlight:
697         backlight_device_unregister(pcc->backlight);
698 out_notify:
699         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
700                                    acpi_pcc_hotkey_notify);
701 out_input:
702         input_unregister_device(pcc->input_dev);
703         /* no need to input_free_device() since core input API refcount and
704          * free()s the device */
705 out_sinf:
706         kfree(pcc->sinf);
707 out_hotkey:
708         kfree(pcc);
709
710         return result;
711 }
712
713 static int __init acpi_pcc_init(void)
714 {
715         int result = 0;
716
717         ACPI_FUNCTION_TRACE("acpi_pcc_init");
718
719         if (acpi_disabled)
720                 return -ENODEV;
721
722         result = acpi_bus_register_driver(&acpi_pcc_driver);
723         if (result < 0) {
724                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
725                                   "Error registering hotkey driver\n"));
726                 return -ENODEV;
727         }
728
729         return 0;
730 }
731
732 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
733 {
734         struct pcc_acpi *pcc = acpi_driver_data(device);
735
736         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_remove");
737
738         if (!device || !pcc)
739                 return -EINVAL;
740
741         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
742
743         backlight_device_unregister(pcc->backlight);
744
745         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
746                                    acpi_pcc_hotkey_notify);
747
748         input_unregister_device(pcc->input_dev);
749         /* no need to input_free_device() since core input API refcount and
750          * free()s the device */
751
752         kfree(pcc->sinf);
753         kfree(pcc);
754
755         return 0;
756 }
757
758 static void __exit acpi_pcc_exit(void)
759 {
760         ACPI_FUNCTION_TRACE("acpi_pcc_exit");
761
762         acpi_bus_unregister_driver(&acpi_pcc_driver);
763 }
764
765 module_init(acpi_pcc_init);
766 module_exit(acpi_pcc_exit);