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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / drivers / platform / x86 / panasonic-laptop.c
blob8361ad75389a96f4c8f7eb87ff57ddb48f2a3380
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 <linux/slab.h>
128 #include <linux/acpi.h>
129 #include <linux/input.h>
130 #include <linux/input/sparse-keymap.h>
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);
178 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
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 #ifdef CONFIG_PM_SLEEP
190 static int acpi_pcc_hotkey_resume(struct device *dev);
191 #endif
192 static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);
193
194 static struct acpi_driver acpi_pcc_driver = {
195 .name = ACPI_PCC_DRIVER_NAME,
196 .class = ACPI_PCC_CLASS,
197 .ids = pcc_device_ids,
198 .ops = {
199 .add = acpi_pcc_hotkey_add,
200 .remove = acpi_pcc_hotkey_remove,
201 .notify = acpi_pcc_hotkey_notify,
202 },
203 .drv.pm = &acpi_pcc_hotkey_pm,
204 };
205
206 static const struct key_entry panasonic_keymap[] = {
207 { KE_KEY, 0, { KEY_RESERVED } },
208 { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
209 { KE_KEY, 2, { KEY_BRIGHTNESSUP } },
210 { KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
211 { KE_KEY, 4, { KEY_MUTE } },
212 { KE_KEY, 5, { KEY_VOLUMEDOWN } },
213 { KE_KEY, 6, { KEY_VOLUMEUP } },
214 { KE_KEY, 7, { KEY_SLEEP } },
215 { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
216 { KE_KEY, 9, { KEY_BATTERY } },
217 { KE_KEY, 10, { KEY_SUSPEND } },
218 { KE_END, 0 }
219 };
220
221 struct pcc_acpi {
222 acpi_handle handle;
223 unsigned long num_sifr;
224 int sticky_mode;
225 u32 *sinf;
226 struct acpi_device *device;
227 struct input_dev *input_dev;
228 struct backlight_device *backlight;
229 };
230
231 /* method access functions */
232 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
233 {
234 union acpi_object in_objs[] = {
235 { .integer.type = ACPI_TYPE_INTEGER,
236 .integer.value = func, },
237 { .integer.type = ACPI_TYPE_INTEGER,
238 .integer.value = val, },
239 };
240 struct acpi_object_list params = {
241 .count = ARRAY_SIZE(in_objs),
242 .pointer = in_objs,
243 };
244 acpi_status status = AE_OK;
245
246 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
247 &params, NULL);
248
249 return (status == AE_OK) ? 0 : -EIO;
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 status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
258 NULL, &s);
259 if (ACPI_SUCCESS(status))
260 return s;
261 else {
262 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
263 "evaluation error HKEY.SQTY\n"));
264 return -EINVAL;
265 }
266 }
267
268 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
269 {
270 acpi_status status;
271 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
272 union acpi_object *hkey = NULL;
273 int i;
274
275 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
276 &buffer);
277 if (ACPI_FAILURE(status)) {
278 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
279 "evaluation error HKEY.SINF\n"));
280 return 0;
281 }
282
283 hkey = buffer.pointer;
284 if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
285 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
286 status = AE_ERROR;
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 pcc->sinf[i] = element->integer.value;
301 } else
302 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
303 "Invalid HKEY.SINF data\n"));
304 }
305 pcc->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))
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))
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 const 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))
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))
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))
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))
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 const 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 sleep_keydown_seen;
449 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
450 {
451 struct input_dev *hotk_input_dev = pcc->input_dev;
452 int rc;
453 unsigned long long result;
454
455 rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
456 NULL, &result);
457 if (ACPI_FAILURE(rc)) {
458 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
459 "error getting hotkey status\n"));
460 return;
461 }
462
463 /* hack: some firmware sends no key down for sleep / hibernate */
464 if ((result & 0xf) == 0x7 || (result & 0xf) == 0xa) {
465 if (result & 0x80)
466 sleep_keydown_seen = 1;
467 if (!sleep_keydown_seen)
468 sparse_keymap_report_event(hotk_input_dev,
469 result & 0xf, 0x80, false);
470 }
471
472 if (!sparse_keymap_report_event(hotk_input_dev,
473 result & 0xf, result & 0x80, false))
474 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
475 "Unknown hotkey event: %d\n", result));
476 }
477
478 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
479 {
480 struct pcc_acpi *pcc = acpi_driver_data(device);
481
482 switch (event) {
483 case HKEY_NOTIFY:
484 acpi_pcc_generate_keyinput(pcc);
485 break;
486 default:
487 /* nothing to do */
488 break;
489 }
490 }
491
492 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
493 {
494 struct input_dev *input_dev;
495 int error;
496
497 input_dev = input_allocate_device();
498 if (!input_dev)
499 return -ENOMEM;
500
501 input_dev->name = ACPI_PCC_DRIVER_NAME;
502 input_dev->phys = ACPI_PCC_INPUT_PHYS;
503 input_dev->id.bustype = BUS_HOST;
504 input_dev->id.vendor = 0x0001;
505 input_dev->id.product = 0x0001;
506 input_dev->id.version = 0x0100;
507
508 error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
509 if (error) {
510 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
511 "Unable to setup input device keymap\n"));
512 goto err_free_dev;
513 }
514
515 error = input_register_device(input_dev);
516 if (error) {
517 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
518 "Unable to register input device\n"));
519 goto err_free_dev;
520 }
521
522 pcc->input_dev = input_dev;
523 return 0;
524
525 err_free_dev:
526 input_free_device(input_dev);
527 return error;
528 }
529
530 /* kernel module interface */
531
532 #ifdef CONFIG_PM_SLEEP
533 static int acpi_pcc_hotkey_resume(struct device *dev)
534 {
535 struct pcc_acpi *pcc;
536
537 if (!dev)
538 return -EINVAL;
539
540 pcc = acpi_driver_data(to_acpi_device(dev));
541 if (!pcc)
542 return -EINVAL;
543
544 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
545 pcc->sticky_mode));
546
547 return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
548 }
549 #endif
550
551 static int acpi_pcc_hotkey_add(struct acpi_device *device)
552 {
553 struct backlight_properties props;
554 struct pcc_acpi *pcc;
555 int num_sifr, result;
556
557 if (!device)
558 return -EINVAL;
559
560 num_sifr = acpi_pcc_get_sqty(device);
561
562 if (num_sifr < 0 || num_sifr > 255) {
563 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
564 return -ENODEV;
565 }
566
567 pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
568 if (!pcc) {
569 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
570 "Couldn't allocate mem for pcc"));
571 return -ENOMEM;
572 }
573
574 pcc->sinf = kcalloc(num_sifr + 1, sizeof(u32), GFP_KERNEL);
575 if (!pcc->sinf) {
576 result = -ENOMEM;
577 goto out_hotkey;
578 }
579
580 pcc->device = device;
581 pcc->handle = device->handle;
582 pcc->num_sifr = num_sifr;
583 device->driver_data = pcc;
584 strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
585 strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
586
587 result = acpi_pcc_init_input(pcc);
588 if (result) {
589 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
590 "Error installing keyinput handler\n"));
591 goto out_sinf;
592 }
593
594 if (!acpi_pcc_retrieve_biosdata(pcc)) {
595 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
596 "Couldn't retrieve BIOS data\n"));
597 result = -EIO;
598 goto out_input;
599 }
600 /* initialize backlight */
601 memset(&props, 0, sizeof(struct backlight_properties));
602 props.type = BACKLIGHT_PLATFORM;
603 props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
604 pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
605 &pcc_backlight_ops, &props);
606 if (IS_ERR(pcc->backlight)) {
607 result = PTR_ERR(pcc->backlight);
608 goto out_input;
609 }
610
611 /* read the initial brightness setting from the hardware */
612 pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
613
614 /* read the initial sticky key mode from the hardware */
615 pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
616
617 /* add sysfs attributes */
618 result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
619 if (result)
620 goto out_backlight;
621
622 return 0;
623
624 out_backlight:
625 backlight_device_unregister(pcc->backlight);
626 out_input:
627 input_unregister_device(pcc->input_dev);
628 out_sinf:
629 kfree(pcc->sinf);
630 out_hotkey:
631 kfree(pcc);
632
633 return result;
634 }
635
636 static int acpi_pcc_hotkey_remove(struct acpi_device *device)
637 {
638 struct pcc_acpi *pcc = acpi_driver_data(device);
639
640 if (!device || !pcc)
641 return -EINVAL;
642
643 sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
644
645 backlight_device_unregister(pcc->backlight);
646
647 input_unregister_device(pcc->input_dev);
648
649 kfree(pcc->sinf);
650 kfree(pcc);
651
652 return 0;
653 }
654
655 module_acpi_driver(acpi_pcc_driver);
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