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drivers/iio/adc/at91_adc.c: use clk_prepare_enable and clk_disable_unprepare
[linux-2.6/btrfs-unstable.git] / drivers / platform / x86 / panasonic-laptop.c
blob8e8caa767d6aec521e65cd42475e3b2950c32907
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 <acpi/acpi_bus.h>
129 #include <acpi/acpi_drivers.h>
130 #include <linux/input.h>
131 #include <linux/input/sparse-keymap.h>
132
133
134 #ifndef ACPI_HOTKEY_COMPONENT
135 #define ACPI_HOTKEY_COMPONENT 0x10000000
136 #endif
137
138 #define _COMPONENT ACPI_HOTKEY_COMPONENT
139
140 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
141 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
142 MODULE_LICENSE("GPL");
143
144 #define LOGPREFIX "pcc_acpi: "
145
146 /* Define ACPI PATHs */
147 /* Lets note hotkeys */
148 #define METHOD_HKEY_QUERY "HINF"
149 #define METHOD_HKEY_SQTY "SQTY"
150 #define METHOD_HKEY_SINF "SINF"
151 #define METHOD_HKEY_SSET "SSET"
152 #define HKEY_NOTIFY 0x80
153
154 #define ACPI_PCC_DRIVER_NAME "Panasonic Laptop Support"
155 #define ACPI_PCC_DEVICE_NAME "Hotkey"
156 #define ACPI_PCC_CLASS "pcc"
157
158 #define ACPI_PCC_INPUT_PHYS "panasonic/hkey0"
159
160 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
161 ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
162 */
163 enum SINF_BITS { SINF_NUM_BATTERIES = 0,
164 SINF_LCD_TYPE,
165 SINF_AC_MAX_BRIGHT,
166 SINF_AC_MIN_BRIGHT,
167 SINF_AC_CUR_BRIGHT,
168 SINF_DC_MAX_BRIGHT,
169 SINF_DC_MIN_BRIGHT,
170 SINF_DC_CUR_BRIGHT,
171 SINF_MUTE,
172 SINF_RESERVED,
173 SINF_ENV_STATE,
174 SINF_STICKY_KEY = 0x80,
175 };
176 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
177
178 static int acpi_pcc_hotkey_add(struct acpi_device *device);
179 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
180 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
181
182 static const struct acpi_device_id pcc_device_ids[] = {
183 { "MAT0012", 0},
184 { "MAT0013", 0},
185 { "MAT0018", 0},
186 { "MAT0019", 0},
187 { "", 0},
188 };
189 MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
190
191 #ifdef CONFIG_PM_SLEEP
192 static int acpi_pcc_hotkey_resume(struct device *dev);
193 #endif
194 static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);
195
196 static struct acpi_driver acpi_pcc_driver = {
197 .name = ACPI_PCC_DRIVER_NAME,
198 .class = ACPI_PCC_CLASS,
199 .ids = pcc_device_ids,
200 .ops = {
201 .add = acpi_pcc_hotkey_add,
202 .remove = acpi_pcc_hotkey_remove,
203 .notify = acpi_pcc_hotkey_notify,
204 },
205 .drv.pm = &acpi_pcc_hotkey_pm,
206 };
207
208 static const struct key_entry panasonic_keymap[] = {
209 { KE_KEY, 0, { KEY_RESERVED } },
210 { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
211 { KE_KEY, 2, { KEY_BRIGHTNESSUP } },
212 { KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
213 { KE_KEY, 4, { KEY_MUTE } },
214 { KE_KEY, 5, { KEY_VOLUMEDOWN } },
215 { KE_KEY, 6, { KEY_VOLUMEUP } },
216 { KE_KEY, 7, { KEY_SLEEP } },
217 { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
218 { KE_KEY, 9, { KEY_BATTERY } },
219 { KE_KEY, 10, { KEY_SUSPEND } },
220 { KE_END, 0 }
221 };
222
223 struct pcc_acpi {
224 acpi_handle handle;
225 unsigned long num_sifr;
226 int sticky_mode;
227 u32 *sinf;
228 struct acpi_device *device;
229 struct input_dev *input_dev;
230 struct backlight_device *backlight;
231 };
232
233 struct pcc_keyinput {
234 struct acpi_hotkey *hotkey;
235 };
236
237 /* method access functions */
238 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
239 {
240 union acpi_object in_objs[] = {
241 { .integer.type = ACPI_TYPE_INTEGER,
242 .integer.value = func, },
243 { .integer.type = ACPI_TYPE_INTEGER,
244 .integer.value = val, },
245 };
246 struct acpi_object_list params = {
247 .count = ARRAY_SIZE(in_objs),
248 .pointer = in_objs,
249 };
250 acpi_status status = AE_OK;
251
252 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
253 &params, NULL);
254
255 return (status == AE_OK) ? 0 : -EIO;
256 }
257
258 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
259 {
260 unsigned long long s;
261 acpi_status status;
262
263 status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
264 NULL, &s);
265 if (ACPI_SUCCESS(status))
266 return s;
267 else {
268 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
269 "evaluation error HKEY.SQTY\n"));
270 return -EINVAL;
271 }
272 }
273
274 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
275 {
276 acpi_status status;
277 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
278 union acpi_object *hkey = NULL;
279 int i;
280
281 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
282 &buffer);
283 if (ACPI_FAILURE(status)) {
284 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
285 "evaluation error HKEY.SINF\n"));
286 return 0;
287 }
288
289 hkey = buffer.pointer;
290 if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
291 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
292 status = AE_ERROR;
293 goto end;
294 }
295
296 if (pcc->num_sifr < hkey->package.count) {
297 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
298 "SQTY reports bad SINF length\n"));
299 status = AE_ERROR;
300 goto end;
301 }
302
303 for (i = 0; i < hkey->package.count; i++) {
304 union acpi_object *element = &(hkey->package.elements[i]);
305 if (likely(element->type == ACPI_TYPE_INTEGER)) {
306 pcc->sinf[i] = element->integer.value;
307 } else
308 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
309 "Invalid HKEY.SINF data\n"));
310 }
311 pcc->sinf[hkey->package.count] = -1;
312
313 end:
314 kfree(buffer.pointer);
315 return status == AE_OK;
316 }
317
318 /* backlight API interface functions */
319
320 /* This driver currently treats AC and DC brightness identical,
321 * since we don't need to invent an interface to the core ACPI
322 * logic to receive events in case a power supply is plugged in
323 * or removed */
324
325 static int bl_get(struct backlight_device *bd)
326 {
327 struct pcc_acpi *pcc = bl_get_data(bd);
328
329 if (!acpi_pcc_retrieve_biosdata(pcc))
330 return -EIO;
331
332 return pcc->sinf[SINF_AC_CUR_BRIGHT];
333 }
334
335 static int bl_set_status(struct backlight_device *bd)
336 {
337 struct pcc_acpi *pcc = bl_get_data(bd);
338 int bright = bd->props.brightness;
339 int rc;
340
341 if (!acpi_pcc_retrieve_biosdata(pcc))
342 return -EIO;
343
344 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
345 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
346
347 if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
348 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
349
350 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
351 bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
352 return -EINVAL;
353
354 rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
355 if (rc < 0)
356 return rc;
357
358 return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
359 }
360
361 static const struct backlight_ops pcc_backlight_ops = {
362 .get_brightness = bl_get,
363 .update_status = bl_set_status,
364 };
365
366
367 /* sysfs user interface functions */
368
369 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
370 char *buf)
371 {
372 struct acpi_device *acpi = to_acpi_device(dev);
373 struct pcc_acpi *pcc = acpi_driver_data(acpi);
374
375 if (!acpi_pcc_retrieve_biosdata(pcc))
376 return -EIO;
377
378 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
379 }
380
381 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
382 char *buf)
383 {
384 struct acpi_device *acpi = to_acpi_device(dev);
385 struct pcc_acpi *pcc = acpi_driver_data(acpi);
386
387 if (!acpi_pcc_retrieve_biosdata(pcc))
388 return -EIO;
389
390 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
391 }
392
393 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
394 char *buf)
395 {
396 struct acpi_device *acpi = to_acpi_device(dev);
397 struct pcc_acpi *pcc = acpi_driver_data(acpi);
398
399 if (!acpi_pcc_retrieve_biosdata(pcc))
400 return -EIO;
401
402 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
403 }
404
405 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
406 char *buf)
407 {
408 struct acpi_device *acpi = to_acpi_device(dev);
409 struct pcc_acpi *pcc = acpi_driver_data(acpi);
410
411 if (!acpi_pcc_retrieve_biosdata(pcc))
412 return -EIO;
413
414 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
415 }
416
417 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
418 const char *buf, size_t count)
419 {
420 struct acpi_device *acpi = to_acpi_device(dev);
421 struct pcc_acpi *pcc = acpi_driver_data(acpi);
422 int val;
423
424 if (count && sscanf(buf, "%i", &val) == 1 &&
425 (val == 0 || val == 1)) {
426 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
427 pcc->sticky_mode = val;
428 }
429
430 return count;
431 }
432
433 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
434 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
435 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
436 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
437
438 static struct attribute *pcc_sysfs_entries[] = {
439 &dev_attr_numbatt.attr,
440 &dev_attr_lcdtype.attr,
441 &dev_attr_mute.attr,
442 &dev_attr_sticky_key.attr,
443 NULL,
444 };
445
446 static struct attribute_group pcc_attr_group = {
447 .name = NULL, /* put in device directory */
448 .attrs = pcc_sysfs_entries,
449 };
450
451
452 /* hotkey input device driver */
453
454 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
455 {
456 struct input_dev *hotk_input_dev = pcc->input_dev;
457 int rc;
458 unsigned long long result;
459
460 rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
461 NULL, &result);
462 if (!ACPI_SUCCESS(rc)) {
463 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
464 "error getting hotkey status\n"));
465 return;
466 }
467
468 acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
469
470 if (!sparse_keymap_report_event(hotk_input_dev,
471 result & 0xf, result & 0x80, false))
472 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
473 "Unknown hotkey event: %d\n", result));
474 }
475
476 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
477 {
478 struct pcc_acpi *pcc = acpi_driver_data(device);
479
480 switch (event) {
481 case HKEY_NOTIFY:
482 acpi_pcc_generate_keyinput(pcc);
483 break;
484 default:
485 /* nothing to do */
486 break;
487 }
488 }
489
490 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
491 {
492 struct input_dev *input_dev;
493 int error;
494
495 input_dev = input_allocate_device();
496 if (!input_dev) {
497 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
498 "Couldn't allocate input device for hotkey"));
499 return -ENOMEM;
500 }
501
502 input_dev->name = ACPI_PCC_DRIVER_NAME;
503 input_dev->phys = ACPI_PCC_INPUT_PHYS;
504 input_dev->id.bustype = BUS_HOST;
505 input_dev->id.vendor = 0x0001;
506 input_dev->id.product = 0x0001;
507 input_dev->id.version = 0x0100;
508
509 error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
510 if (error) {
511 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
512 "Unable to setup input device keymap\n"));
513 goto err_free_dev;
514 }
515
516 error = input_register_device(input_dev);
517 if (error) {
518 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
519 "Unable to register input device\n"));
520 goto err_free_keymap;
521 }
522
523 pcc->input_dev = input_dev;
524 return 0;
525
526 err_free_keymap:
527 sparse_keymap_free(input_dev);
528 err_free_dev:
529 input_free_device(input_dev);
530 return error;
531 }
532
533 static void acpi_pcc_destroy_input(struct pcc_acpi *pcc)
534 {
535 sparse_keymap_free(pcc->input_dev);
536 input_unregister_device(pcc->input_dev);
537 /*
538 * No need to input_free_device() since core input API refcounts
539 * and free()s the device.
540 */
541 }
542
543 /* kernel module interface */
544
545 #ifdef CONFIG_PM_SLEEP
546 static int acpi_pcc_hotkey_resume(struct device *dev)
547 {
548 struct pcc_acpi *pcc;
549
550 if (!dev)
551 return -EINVAL;
552
553 pcc = acpi_driver_data(to_acpi_device(dev));
554 if (!pcc)
555 return -EINVAL;
556
557 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
558 pcc->sticky_mode));
559
560 return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
561 }
562 #endif
563
564 static int acpi_pcc_hotkey_add(struct acpi_device *device)
565 {
566 struct backlight_properties props;
567 struct pcc_acpi *pcc;
568 int num_sifr, result;
569
570 if (!device)
571 return -EINVAL;
572
573 num_sifr = acpi_pcc_get_sqty(device);
574
575 if (num_sifr < 0 || num_sifr > 255) {
576 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
577 return -ENODEV;
578 }
579
580 pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
581 if (!pcc) {
582 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
583 "Couldn't allocate mem for pcc"));
584 return -ENOMEM;
585 }
586
587 pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
588 if (!pcc->sinf) {
589 result = -ENOMEM;
590 goto out_hotkey;
591 }
592
593 pcc->device = device;
594 pcc->handle = device->handle;
595 pcc->num_sifr = num_sifr;
596 device->driver_data = pcc;
597 strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
598 strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
599
600 result = acpi_pcc_init_input(pcc);
601 if (result) {
602 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
603 "Error installing keyinput handler\n"));
604 goto out_sinf;
605 }
606
607 if (!acpi_pcc_retrieve_biosdata(pcc)) {
608 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
609 "Couldn't retrieve BIOS data\n"));
610 result = -EIO;
611 goto out_input;
612 }
613 /* initialize backlight */
614 memset(&props, 0, sizeof(struct backlight_properties));
615 props.type = BACKLIGHT_PLATFORM;
616 props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
617 pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
618 &pcc_backlight_ops, &props);
619 if (IS_ERR(pcc->backlight)) {
620 result = PTR_ERR(pcc->backlight);
621 goto out_input;
622 }
623
624 /* read the initial brightness setting from the hardware */
625 pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
626
627 /* read the initial sticky key mode from the hardware */
628 pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
629
630 /* add sysfs attributes */
631 result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
632 if (result)
633 goto out_backlight;
634
635 return 0;
636
637 out_backlight:
638 backlight_device_unregister(pcc->backlight);
639 out_input:
640 acpi_pcc_destroy_input(pcc);
641 out_sinf:
642 kfree(pcc->sinf);
643 out_hotkey:
644 kfree(pcc);
645
646 return result;
647 }
648
649 static int __init acpi_pcc_init(void)
650 {
651 int result = 0;
652
653 if (acpi_disabled)
654 return -ENODEV;
655
656 result = acpi_bus_register_driver(&acpi_pcc_driver);
657 if (result < 0) {
658 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
659 "Error registering hotkey driver\n"));
660 return -ENODEV;
661 }
662
663 return 0;
664 }
665
666 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
667 {
668 struct pcc_acpi *pcc = acpi_driver_data(device);
669
670 if (!device || !pcc)
671 return -EINVAL;
672
673 sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
674
675 backlight_device_unregister(pcc->backlight);
676
677 acpi_pcc_destroy_input(pcc);
678
679 kfree(pcc->sinf);
680 kfree(pcc);
681
682 return 0;
683 }
684
685 static void __exit acpi_pcc_exit(void)
686 {
687 acpi_bus_unregister_driver(&acpi_pcc_driver);
688 }
689
690 module_init(acpi_pcc_init);
691 module_exit(acpi_pcc_exit);
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