Merge branches 'release', 'APERF', 'ARAT', 'misc', 'kelvin', 'device-lock' and 'bjorn...
[sfrench/cifs-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 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         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, int scancode, int *keycode)
449 {
450         struct pcc_acpi *pcc = input_get_drvdata(dev);
451
452         if (scancode >= ARRAY_SIZE(pcc->keymap))
453                 return -EINVAL;
454
455         *keycode = pcc->keymap[scancode];
456
457         return 0;
458 }
459
460 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
461 {
462         int i;
463
464         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
465                 if (pcc->keymap[i] == keycode)
466                         return i+1;
467         }
468
469         return 0;
470 }
471
472 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
473 {
474         struct pcc_acpi *pcc = input_get_drvdata(dev);
475         int oldkeycode;
476
477         if (scancode >= ARRAY_SIZE(pcc->keymap))
478                 return -EINVAL;
479
480         if (keycode < 0 || keycode > KEY_MAX)
481                 return -EINVAL;
482
483         oldkeycode = pcc->keymap[scancode];
484         pcc->keymap[scancode] = keycode;
485
486         set_bit(keycode, dev->keybit);
487
488         if (!keymap_get_by_keycode(pcc, oldkeycode))
489                 clear_bit(oldkeycode, dev->keybit);
490
491         return 0;
492 }
493
494 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
495 {
496         struct input_dev *hotk_input_dev = pcc->input_dev;
497         int rc;
498         int key_code, hkey_num;
499         unsigned long long result;
500
501         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
502                                    NULL, &result);
503         if (!ACPI_SUCCESS(rc)) {
504                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
505                                  "error getting hotkey status\n"));
506                 return;
507         }
508
509         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
510
511         hkey_num = result & 0xf;
512
513         if (hkey_num < 0 || hkey_num >= ARRAY_SIZE(pcc->keymap)) {
514                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
515                                   "hotkey number out of range: %d\n",
516                                   hkey_num));
517                 return;
518         }
519
520         key_code = pcc->keymap[hkey_num];
521
522         if (key_code != KEY_RESERVED) {
523                 int pushed = (result & 0x80) ? TRUE : FALSE;
524
525                 input_report_key(hotk_input_dev, key_code, pushed);
526                 input_sync(hotk_input_dev);
527         }
528
529         return;
530 }
531
532 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
533 {
534         struct pcc_acpi *pcc = acpi_driver_data(device);
535
536         switch (event) {
537         case HKEY_NOTIFY:
538                 acpi_pcc_generate_keyinput(pcc);
539                 break;
540         default:
541                 /* nothing to do */
542                 break;
543         }
544 }
545
546 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
547 {
548         int i, rc;
549
550         pcc->input_dev = input_allocate_device();
551         if (!pcc->input_dev) {
552                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
553                                   "Couldn't allocate input device for hotkey"));
554                 return -ENOMEM;
555         }
556
557         pcc->input_dev->evbit[0] = BIT(EV_KEY);
558
559         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
560         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
561         pcc->input_dev->id.bustype = BUS_HOST;
562         pcc->input_dev->id.vendor = 0x0001;
563         pcc->input_dev->id.product = 0x0001;
564         pcc->input_dev->id.version = 0x0100;
565         pcc->input_dev->getkeycode = pcc_getkeycode;
566         pcc->input_dev->setkeycode = pcc_setkeycode;
567
568         /* load initial keymap */
569         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
570
571         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
572                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
573         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
574
575         input_set_drvdata(pcc->input_dev, pcc);
576
577         rc = input_register_device(pcc->input_dev);
578         if (rc < 0)
579                 input_free_device(pcc->input_dev);
580
581         return rc;
582 }
583
584 /* kernel module interface */
585
586 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
587 {
588         struct pcc_acpi *pcc = acpi_driver_data(device);
589         acpi_status status = AE_OK;
590
591         if (device == NULL || pcc == NULL)
592                 return -EINVAL;
593
594         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
595                           pcc->sticky_mode));
596
597         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
598
599         return status == AE_OK ? 0 : -EINVAL;
600 }
601
602 static int acpi_pcc_hotkey_add(struct acpi_device *device)
603 {
604         struct pcc_acpi *pcc;
605         int num_sifr, result;
606
607         if (!device)
608                 return -EINVAL;
609
610         num_sifr = acpi_pcc_get_sqty(device);
611
612         if (num_sifr > 255) {
613                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
614                 return -ENODEV;
615         }
616
617         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
618         if (!pcc) {
619                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
620                                   "Couldn't allocate mem for pcc"));
621                 return -ENOMEM;
622         }
623
624         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
625         if (!pcc->sinf) {
626                 result = -ENOMEM;
627                 goto out_hotkey;
628         }
629
630         pcc->device = device;
631         pcc->handle = device->handle;
632         pcc->num_sifr = num_sifr;
633         device->driver_data = pcc;
634         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
635         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
636
637         result = acpi_pcc_init_input(pcc);
638         if (result) {
639                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
640                                   "Error installing keyinput handler\n"));
641                 goto out_sinf;
642         }
643
644         /* initialize backlight */
645         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
646                                                    &pcc_backlight_ops);
647         if (IS_ERR(pcc->backlight))
648                 goto out_input;
649
650         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
651                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
652                                  "Couldn't retrieve BIOS data\n"));
653                 goto out_backlight;
654         }
655
656         /* read the initial brightness setting from the hardware */
657         pcc->backlight->props.max_brightness =
658                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
659         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
660
661         /* read the initial sticky key mode from the hardware */
662         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
663
664         /* add sysfs attributes */
665         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
666         if (result)
667                 goto out_backlight;
668
669         return 0;
670
671 out_backlight:
672         backlight_device_unregister(pcc->backlight);
673 out_input:
674         input_unregister_device(pcc->input_dev);
675         /* no need to input_free_device() since core input API refcount and
676          * free()s the device */
677 out_sinf:
678         kfree(pcc->sinf);
679 out_hotkey:
680         kfree(pcc);
681
682         return result;
683 }
684
685 static int __init acpi_pcc_init(void)
686 {
687         int result = 0;
688
689         if (acpi_disabled)
690                 return -ENODEV;
691
692         result = acpi_bus_register_driver(&acpi_pcc_driver);
693         if (result < 0) {
694                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
695                                   "Error registering hotkey driver\n"));
696                 return -ENODEV;
697         }
698
699         return 0;
700 }
701
702 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
703 {
704         struct pcc_acpi *pcc = acpi_driver_data(device);
705
706         if (!device || !pcc)
707                 return -EINVAL;
708
709         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
710
711         backlight_device_unregister(pcc->backlight);
712
713         input_unregister_device(pcc->input_dev);
714         /* no need to input_free_device() since core input API refcount and
715          * free()s the device */
716
717         kfree(pcc->sinf);
718         kfree(pcc);
719
720         return 0;
721 }
722
723 static void __exit acpi_pcc_exit(void)
724 {
725         acpi_bus_unregister_driver(&acpi_pcc_driver);
726 }
727
728 module_init(acpi_pcc_init);
729 module_exit(acpi_pcc_exit);