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ACPI: panasonic-laptop.c: remove ACPI_FUNCTION_TRACE
[linux-2.6/mini2440.git] / drivers / misc / panasonic-laptop.c
blobf30db367c82eed36540b9db55f7e6b9abb72267b
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 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
245 &params, NULL);
246
247 return status == AE_OK;
248 }
249
250 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
251 {
252 unsigned long long s;
253 acpi_status status;
254
255 status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
256 NULL, &s);
257 if (ACPI_SUCCESS(status))
258 return s;
259 else {
260 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
261 "evaluation error HKEY.SQTY\n"));
262 return -EINVAL;
263 }
264 }
265
266 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
267 {
268 acpi_status status;
269 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
270 union acpi_object *hkey = NULL;
271 int i;
272
273 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
274 &buffer);
275 if (ACPI_FAILURE(status)) {
276 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
277 "evaluation error HKEY.SINF\n"));
278 return 0;
279 }
280
281 hkey = buffer.pointer;
282 if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
283 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
284 goto end;
285 }
286
287 if (pcc->num_sifr < hkey->package.count) {
288 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
289 "SQTY reports bad SINF length\n"));
290 status = AE_ERROR;
291 goto end;
292 }
293
294 for (i = 0; i < hkey->package.count; i++) {
295 union acpi_object *element = &(hkey->package.elements[i]);
296 if (likely(element->type == ACPI_TYPE_INTEGER)) {
297 sinf[i] = element->integer.value;
298 } else
299 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
300 "Invalid HKEY.SINF data\n"));
301 }
302 sinf[hkey->package.count] = -1;
303
304 end:
305 kfree(buffer.pointer);
306 return status == AE_OK;
307 }
308
309 /* backlight API interface functions */
310
311 /* This driver currently treats AC and DC brightness identical,
312 * since we don't need to invent an interface to the core ACPI
313 * logic to receive events in case a power supply is plugged in
314 * or removed */
315
316 static int bl_get(struct backlight_device *bd)
317 {
318 struct pcc_acpi *pcc = bl_get_data(bd);
319
320 if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
321 return -EIO;
322
323 return pcc->sinf[SINF_AC_CUR_BRIGHT];
324 }
325
326 static int bl_set_status(struct backlight_device *bd)
327 {
328 struct pcc_acpi *pcc = bl_get_data(bd);
329 int bright = bd->props.brightness;
330 int rc;
331
332 if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
333 return -EIO;
334
335 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
336 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
337
338 if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
339 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
340
341 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
342 bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
343 return -EINVAL;
344
345 rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
346 if (rc < 0)
347 return rc;
348
349 return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
350 }
351
352 static struct backlight_ops pcc_backlight_ops = {
353 .get_brightness = bl_get,
354 .update_status = bl_set_status,
355 };
356
357
358 /* sysfs user interface functions */
359
360 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
361 char *buf)
362 {
363 struct acpi_device *acpi = to_acpi_device(dev);
364 struct pcc_acpi *pcc = acpi_driver_data(acpi);
365
366 if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
367 return -EIO;
368
369 return sprintf(buf, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
370 }
371
372 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
373 char *buf)
374 {
375 struct acpi_device *acpi = to_acpi_device(dev);
376 struct pcc_acpi *pcc = acpi_driver_data(acpi);
377
378 if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
379 return -EIO;
380
381 return sprintf(buf, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
382 }
383
384 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
385 char *buf)
386 {
387 struct acpi_device *acpi = to_acpi_device(dev);
388 struct pcc_acpi *pcc = acpi_driver_data(acpi);
389
390 if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
391 return -EIO;
392
393 return sprintf(buf, "%u\n", pcc->sinf[SINF_MUTE]);
394 }
395
396 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
397 char *buf)
398 {
399 struct acpi_device *acpi = to_acpi_device(dev);
400 struct pcc_acpi *pcc = acpi_driver_data(acpi);
401
402 if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
403 return -EIO;
404
405 return sprintf(buf, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
406 }
407
408 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
409 const char *buf, size_t count)
410 {
411 struct acpi_device *acpi = to_acpi_device(dev);
412 struct pcc_acpi *pcc = acpi_driver_data(acpi);
413 int val;
414
415 if (count && sscanf(buf, "%i", &val) == 1 &&
416 (val == 0 || val == 1)) {
417 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
418 pcc->sticky_mode = val;
419 }
420
421 return count;
422 }
423
424 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
425 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
426 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
427 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
428
429 static struct attribute *pcc_sysfs_entries[] = {
430 &dev_attr_numbatt.attr,
431 &dev_attr_lcdtype.attr,
432 &dev_attr_mute.attr,
433 &dev_attr_sticky_key.attr,
434 NULL,
435 };
436
437 static struct attribute_group pcc_attr_group = {
438 .name = NULL, /* put in device directory */
439 .attrs = pcc_sysfs_entries,
440 };
441
442
443 /* hotkey input device driver */
444
445 static int pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
446 {
447 struct pcc_acpi *pcc = input_get_drvdata(dev);
448
449 if (scancode >= ARRAY_SIZE(pcc->keymap))
450 return -EINVAL;
451
452 *keycode = pcc->keymap[scancode];
453
454 return 0;
455 }
456
457 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
458 {
459 int i;
460
461 for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
462 if (pcc->keymap[i] == keycode)
463 return i+1;
464 }
465
466 return 0;
467 }
468
469 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
470 {
471 struct pcc_acpi *pcc = input_get_drvdata(dev);
472 int oldkeycode;
473
474 if (scancode >= ARRAY_SIZE(pcc->keymap))
475 return -EINVAL;
476
477 if (keycode < 0 || keycode > KEY_MAX)
478 return -EINVAL;
479
480 oldkeycode = pcc->keymap[scancode];
481 pcc->keymap[scancode] = keycode;
482
483 set_bit(keycode, dev->keybit);
484
485 if (!keymap_get_by_keycode(pcc, oldkeycode))
486 clear_bit(oldkeycode, dev->keybit);
487
488 return 0;
489 }
490
491 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
492 {
493 struct input_dev *hotk_input_dev = pcc->input_dev;
494 int rc;
495 int key_code, hkey_num;
496 unsigned long long result;
497
498 rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
499 NULL, &result);
500 if (!ACPI_SUCCESS(rc)) {
501 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
502 "error getting hotkey status\n"));
503 return;
504 }
505
506 acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
507
508 hkey_num = result & 0xf;
509
510 if (hkey_num < 0 || hkey_num > ARRAY_SIZE(pcc->keymap)) {
511 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
512 "hotkey number out of range: %d\n",
513 hkey_num));
514 return;
515 }
516
517 key_code = pcc->keymap[hkey_num];
518
519 if (key_code != KEY_RESERVED) {
520 int pushed = (result & 0x80) ? TRUE : FALSE;
521
522 input_report_key(hotk_input_dev, key_code, pushed);
523 input_sync(hotk_input_dev);
524 }
525
526 return;
527 }
528
529 static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
530 {
531 struct pcc_acpi *pcc = (struct pcc_acpi *) data;
532
533 switch (event) {
534 case HKEY_NOTIFY:
535 acpi_pcc_generate_keyinput(pcc);
536 break;
537 default:
538 /* nothing to do */
539 break;
540 }
541 }
542
543 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
544 {
545 int i, rc;
546
547 pcc->input_dev = input_allocate_device();
548 if (!pcc->input_dev) {
549 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
550 "Couldn't allocate input device for hotkey"));
551 return -ENOMEM;
552 }
553
554 pcc->input_dev->evbit[0] = BIT(EV_KEY);
555
556 pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
557 pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
558 pcc->input_dev->id.bustype = BUS_HOST;
559 pcc->input_dev->id.vendor = 0x0001;
560 pcc->input_dev->id.product = 0x0001;
561 pcc->input_dev->id.version = 0x0100;
562 pcc->input_dev->getkeycode = pcc_getkeycode;
563 pcc->input_dev->setkeycode = pcc_setkeycode;
564
565 /* load initial keymap */
566 memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
567
568 for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
569 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
570 __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
571
572 input_set_drvdata(pcc->input_dev, pcc);
573
574 rc = input_register_device(pcc->input_dev);
575 if (rc < 0)
576 input_free_device(pcc->input_dev);
577
578 return rc;
579 }
580
581 /* kernel module interface */
582
583 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
584 {
585 struct pcc_acpi *pcc = acpi_driver_data(device);
586 acpi_status status = AE_OK;
587
588 if (device == NULL || pcc == NULL)
589 return -EINVAL;
590
591 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
592 pcc->sticky_mode));
593
594 status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
595
596 return status == AE_OK ? 0 : -EINVAL;
597 }
598
599 static int acpi_pcc_hotkey_add(struct acpi_device *device)
600 {
601 acpi_status status;
602 struct pcc_acpi *pcc;
603 int num_sifr, result;
604
605 if (!device)
606 return -EINVAL;
607
608 num_sifr = acpi_pcc_get_sqty(device);
609
610 if (num_sifr > 255) {
611 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
612 return -ENODEV;
613 }
614
615 pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
616 if (!pcc) {
617 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
618 "Couldn't allocate mem for pcc"));
619 return -ENOMEM;
620 }
621
622 pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
623 if (!pcc->sinf) {
624 result = -ENOMEM;
625 goto out_hotkey;
626 }
627
628 pcc->device = device;
629 pcc->handle = device->handle;
630 pcc->num_sifr = num_sifr;
631 device->driver_data = pcc;
632 strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
633 strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
634
635 result = acpi_pcc_init_input(pcc);
636 if (result) {
637 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
638 "Error installing keyinput handler\n"));
639 goto out_sinf;
640 }
641
642 /* initialize hotkey input device */
643 status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
644 acpi_pcc_hotkey_notify, pcc);
645
646 if (ACPI_FAILURE(status)) {
647 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
648 "Error installing notify handler\n"));
649 result = -ENODEV;
650 goto out_input;
651 }
652
653 /* initialize backlight */
654 pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
655 &pcc_backlight_ops);
656 if (IS_ERR(pcc->backlight))
657 goto out_notify;
658
659 if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
660 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
661 "Couldn't retrieve BIOS data\n"));
662 goto out_backlight;
663 }
664
665 /* read the initial brightness setting from the hardware */
666 pcc->backlight->props.max_brightness =
667 pcc->sinf[SINF_AC_MAX_BRIGHT];
668 pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
669
670 /* read the initial sticky key mode from the hardware */
671 pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
672
673 /* add sysfs attributes */
674 result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
675 if (result)
676 goto out_backlight;
677
678 return 0;
679
680 out_backlight:
681 backlight_device_unregister(pcc->backlight);
682 out_notify:
683 acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
684 acpi_pcc_hotkey_notify);
685 out_input:
686 input_unregister_device(pcc->input_dev);
687 /* no need to input_free_device() since core input API refcount and
688 * free()s the device */
689 out_sinf:
690 kfree(pcc->sinf);
691 out_hotkey:
692 kfree(pcc);
693
694 return result;
695 }
696
697 static int __init acpi_pcc_init(void)
698 {
699 int result = 0;
700
701 if (acpi_disabled)
702 return -ENODEV;
703
704 result = acpi_bus_register_driver(&acpi_pcc_driver);
705 if (result < 0) {
706 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
707 "Error registering hotkey driver\n"));
708 return -ENODEV;
709 }
710
711 return 0;
712 }
713
714 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
715 {
716 struct pcc_acpi *pcc = acpi_driver_data(device);
717
718 if (!device || !pcc)
719 return -EINVAL;
720
721 sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
722
723 backlight_device_unregister(pcc->backlight);
724
725 acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
726 acpi_pcc_hotkey_notify);
727
728 input_unregister_device(pcc->input_dev);
729 /* no need to input_free_device() since core input API refcount and
730 * free()s the device */
731
732 kfree(pcc->sinf);
733 kfree(pcc);
734
735 return 0;
736 }
737
738 static void __exit acpi_pcc_exit(void)
739 {
740 acpi_bus_unregister_driver(&acpi_pcc_driver);
741 }
742
743 module_init(acpi_pcc_init);
744 module_exit(acpi_pcc_exit);
Support for the Chinese Samsung S3C2440 based development boards