summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/hotkey.c
blob: 0aef9fc449c557e9e8d4ec558c82e3f5b1f54606 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
/* 
 *  hotkey.c - ACPI Hotkey Driver ($Revision:$)
 *
 *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <linux/kmod.h>
#include <linux/seq_file.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <asm/uaccess.h>

#define HOTKEY_ACPI_VERSION "0.1"

#define HOTKEY_PROC "hotkey"
#define HOTKEY_EV_CONFIG    "event_config"
#define HOTKEY_PL_CONFIG    "poll_config"
#define HOTKEY_ACTION   "action"
#define HOTKEY_INFO "info"

#define ACPI_HOTK_NAME          "Generic Hotkey Driver"
#define ACPI_HOTK_CLASS         "Hotkey"
#define ACPI_HOTK_DEVICE_NAME   "Hotkey"
#define ACPI_HOTK_HID           "Unknown?"
#define ACPI_HOTKEY_COMPONENT   0x20000000

#define ACPI_HOTKEY_EVENT   0x1
#define ACPI_HOTKEY_POLLING 0x2
#define ACPI_UNDEFINED_EVENT    0xf

#define MAX_CONFIG_RECORD_LEN   80
#define MAX_NAME_PATH_LEN   80
#define MAX_CALL_PARM       80

#define IS_EVENT(e)       0xff	/* ((e) & 0x40000000)  */
#define IS_POLL(e)      0xff	/* (~((e) & 0x40000000))  */

#define _COMPONENT              ACPI_HOTKEY_COMPONENT
ACPI_MODULE_NAME("acpi_hotkey")

    MODULE_AUTHOR("luming.yu@intel.com");
MODULE_DESCRIPTION(ACPI_HOTK_NAME);
MODULE_LICENSE("GPL");

/*  standardized internal hotkey number/event  */
enum {
	/* Video Extension event */
	HK_EVENT_CYCLE_OUTPUT_DEVICE = 0x80,
	HK_EVENT_OUTPUT_DEVICE_STATUS_CHANGE,
	HK_EVENT_CYCLE_DISPLAY_OUTPUT,
	HK_EVENT_NEXT_DISPLAY_OUTPUT,
	HK_EVENT_PREVIOUS_DISPLAY_OUTPUT,
	HK_EVENT_CYCLE_BRIGHTNESS,
	HK_EVENT_INCREASE_BRIGHTNESS,
	HK_EVENT_DECREASE_BRIGHTNESS,
	HK_EVENT_ZERO_BRIGHTNESS,
	HK_EVENT_DISPLAY_DEVICE_OFF,

	/* Snd Card event */
	HK_EVENT_VOLUME_MUTE,
	HK_EVENT_VOLUME_INCLREASE,
	HK_EVENT_VOLUME_DECREASE,

	/* running state control */
	HK_EVENT_ENTERRING_S3,
	HK_EVENT_ENTERRING_S4,
	HK_EVENT_ENTERRING_S5,
};

/*  procdir we use */
static struct proc_dir_entry *hotkey_proc_dir;
static struct proc_dir_entry *hotkey_config;
static struct proc_dir_entry *hotkey_poll_config;
static struct proc_dir_entry *hotkey_action;
static struct proc_dir_entry *hotkey_info;

/* linkage for all type of hotkey */
struct acpi_hotkey_link {
	struct list_head entries;
	int hotkey_type;	/* event or polling based hotkey  */
	int hotkey_standard_num;	/* standardized hotkey(event) number */
};

/* event based hotkey */
struct acpi_event_hotkey {
	struct acpi_hotkey_link hotkey_link;
	int flag;
	acpi_handle bus_handle;	/* bus to install notify handler */
	int external_hotkey_num;	/* external hotkey/event number */
	acpi_handle action_handle;	/* acpi handle attached aml action method */
	char *action_method;	/* action method */
};

/* 
 * There are two ways to poll status
 * 1. directy call read_xxx method, without any arguments passed in
 * 2. call write_xxx method, with arguments passed in, you need
 * the result is saved in acpi_polling_hotkey.poll_result.
 * anthoer read command through polling interface.
 *
 */

/* polling based hotkey */
struct acpi_polling_hotkey {
	struct acpi_hotkey_link hotkey_link;
	int flag;
	acpi_handle poll_handle;	/* acpi handle attached polling method */
	char *poll_method;	/* poll method */
	acpi_handle action_handle;	/* acpi handle attached action method */
	char *action_method;	/* action method */
	void *poll_result;	/* polling_result */
	struct proc_dir_entry *proc;
};

/* hotkey object union */
union acpi_hotkey {
	struct list_head entries;
	struct acpi_hotkey_link link;
	struct acpi_event_hotkey event_hotkey;
	struct acpi_polling_hotkey poll_hotkey;
};

/* hotkey object list */
struct acpi_hotkey_list {
	struct list_head *entries;
	int count;
};

static int auto_hotkey_add(struct acpi_device *device);
static int auto_hotkey_remove(struct acpi_device *device, int type);

static struct acpi_driver hotkey_driver = {
	.name = ACPI_HOTK_NAME,
	.class = ACPI_HOTK_CLASS,
	.ids = ACPI_HOTK_HID,
	.ops = {
		.add = auto_hotkey_add,
		.remove = auto_hotkey_remove,
		},
};

static int hotkey_open_config(struct inode *inode, struct file *file);
static ssize_t hotkey_write_config(struct file *file,
				   const char __user * buffer,
				   size_t count, loff_t * data);
static ssize_t hotkey_write_poll_config(struct file *file,
					const char __user * buffer,
					size_t count, loff_t * data);
static int hotkey_info_open_fs(struct inode *inode, struct file *file);
static int hotkey_action_open_fs(struct inode *inode, struct file *file);
static ssize_t hotkey_execute_aml_method(struct file *file,
					 const char __user * buffer,
					 size_t count, loff_t * data);
static int hotkey_config_seq_show(struct seq_file *seq, void *offset);
static int hotkey_polling_open_fs(struct inode *inode, struct file *file);

/* event based config */
static struct file_operations hotkey_config_fops = {
	.open = hotkey_open_config,
	.read = seq_read,
	.write = hotkey_write_config,
	.llseek = seq_lseek,
	.release = single_release,
};

/* polling based config */
static struct file_operations hotkey_poll_config_fops = {
	.open = hotkey_open_config,
	.read = seq_read,
	.write = hotkey_write_poll_config,
	.llseek = seq_lseek,
	.release = single_release,
};

/* hotkey driver info */
static struct file_operations hotkey_info_fops = {
	.open = hotkey_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

/* action */
static struct file_operations hotkey_action_fops = {
	.open = hotkey_action_open_fs,
	.read = seq_read,
	.write = hotkey_execute_aml_method,
	.llseek = seq_lseek,
	.release = single_release,
};

/* polling results */
static struct file_operations hotkey_polling_fops = {
	.open = hotkey_polling_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

struct acpi_hotkey_list global_hotkey_list;	/* link all ev or pl hotkey  */
struct list_head hotkey_entries;	/* head of the list of hotkey_list */

static int hotkey_info_seq_show(struct seq_file *seq, void *offset)
{
	ACPI_FUNCTION_TRACE("hotkey_info_seq_show");

	seq_printf(seq, "Hotkey generic driver ver: %s", HOTKEY_ACPI_VERSION);

	return_VALUE(0);
}

static int hotkey_info_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
}

static char *format_result(union acpi_object *object)
{
	char *buf = (char *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);

	memset(buf, 0, sizeof(union acpi_object));

	/* Now, just support integer type */
	if (object->type == ACPI_TYPE_INTEGER)
		sprintf(buf, "%d", (u32) object->integer.value);

	return buf;
}

static int hotkey_polling_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_polling_hotkey *poll_hotkey =
	    (struct acpi_polling_hotkey *)seq->private;

	ACPI_FUNCTION_TRACE("hotkey_polling_seq_show");

	if (poll_hotkey->poll_result)
		seq_printf(seq, "%s", format_result(poll_hotkey->poll_result));

	return_VALUE(0);
}

static int hotkey_polling_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, hotkey_polling_seq_show, PDE(inode)->data);
}

static int hotkey_action_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, hotkey_info_seq_show, PDE(inode)->data);
}

/* Mapping external hotkey number to standardized hotkey event num */
static int hotkey_get_internal_event(int event, struct acpi_hotkey_list *list)
{
	struct list_head *entries, *next;
	int val = 0;

	ACPI_FUNCTION_TRACE("hotkey_get_internal_event");

	list_for_each_safe(entries, next, list->entries) {
		union acpi_hotkey *key =
		    container_of(entries, union acpi_hotkey, entries);
		if (key->link.hotkey_type == ACPI_HOTKEY_EVENT
		    && key->event_hotkey.external_hotkey_num == event)
			val = key->link.hotkey_standard_num;
		else
			val = -1;
	}

	return_VALUE(val);
}

static void
acpi_hotkey_notify_handler(acpi_handle handle, u32 event, void *data)
{
	struct acpi_device *device = NULL;
	u32 internal_event;

	ACPI_FUNCTION_TRACE("acpi_hotkey_notify_handler");

	if (acpi_bus_get_device(handle, &device))
		return_VOID;

	internal_event = hotkey_get_internal_event(event, &global_hotkey_list);
	acpi_bus_generate_event(device, event, 0);

	return_VOID;
}

/* Need to invent automatically hotkey add method */
static int auto_hotkey_add(struct acpi_device *device)
{
	/* Implement me */
	return 0;
}

/* Need to invent automatically hotkey remove method */
static int auto_hotkey_remove(struct acpi_device *device, int type)
{
	/* Implement me */
	return 0;
}

/* Create a proc file for each polling method */
static int create_polling_proc(union acpi_hotkey *device)
{
	struct proc_dir_entry *proc;

	ACPI_FUNCTION_TRACE("create_polling_proc");
	mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;

	proc = create_proc_entry(device->poll_hotkey.action_method,
				 mode, hotkey_proc_dir);

	if (!proc) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Hotkey: Unable to create %s entry\n",
				  device->poll_hotkey.poll_method));
		return_VALUE(-ENODEV);
	} else {
		proc->proc_fops = &hotkey_polling_fops;
		proc->owner = THIS_MODULE;
		proc->data = device;
		proc->uid = 0;
		proc->gid = 0;
		device->poll_hotkey.proc = proc;
	}
	return_VALUE(0);
}

static int is_valid_acpi_path(const char *pathname)
{
	acpi_handle handle;
	acpi_status status;
	ACPI_FUNCTION_TRACE("is_valid_acpi_path");

	status = acpi_get_handle(NULL, (char *)pathname, &handle);
	return_VALUE(!ACPI_FAILURE(status));
}

static int is_valid_hotkey(union acpi_hotkey *device)
{
	ACPI_FUNCTION_TRACE("is_valid_hotkey");
	/* Implement valid check */
	return_VALUE(1);
}

static int hotkey_add(union acpi_hotkey *device)
{
	int status = 0;
	struct acpi_device *dev = NULL;

	ACPI_FUNCTION_TRACE("hotkey_add");

	if (device->link.hotkey_type == ACPI_HOTKEY_EVENT) {
		status =
		    acpi_bus_get_device(device->event_hotkey.bus_handle, &dev);
		if (status)
			return_VALUE(status);

		status = acpi_install_notify_handler(dev->handle,
						     ACPI_SYSTEM_NOTIFY,
						     acpi_hotkey_notify_handler,
						     device);
	} else			/* Add polling hotkey */
		create_polling_proc(device);

	global_hotkey_list.count++;

	list_add_tail(&device->link.entries, global_hotkey_list.entries);

	return_VALUE(status);
}

static int hotkey_remove(union acpi_hotkey *device)
{
	struct list_head *entries, *next;

	ACPI_FUNCTION_TRACE("hotkey_remove");

	list_for_each_safe(entries, next, global_hotkey_list.entries) {
		union acpi_hotkey *key =
		    container_of(entries, union acpi_hotkey, entries);
		if (key->link.hotkey_standard_num ==
		    device->link.hotkey_standard_num) {
			list_del(&key->link.entries);
			remove_proc_entry(key->poll_hotkey.action_method,
					  hotkey_proc_dir);
			global_hotkey_list.count--;
			break;
		}
	}
	return_VALUE(0);
}

static void hotkey_update(union acpi_hotkey *key)
{
	struct list_head *entries, *next;

	ACPI_FUNCTION_TRACE("hotkey_update");

	list_for_each_safe(entries, next, global_hotkey_list.entries) {
		union acpi_hotkey *key =
		    container_of(entries, union acpi_hotkey, entries);
		if (key->link.hotkey_standard_num ==
		    key->link.hotkey_standard_num) {
			key->event_hotkey.bus_handle =
			    key->event_hotkey.bus_handle;
			key->event_hotkey.external_hotkey_num =
			    key->event_hotkey.external_hotkey_num;
			key->event_hotkey.action_handle =
			    key->event_hotkey.action_handle;
			key->event_hotkey.action_method =
			    key->event_hotkey.action_method;
			break;
		}
	}

	return_VOID;
}

static void free_hotkey_device(union acpi_hotkey *key)
{
	struct acpi_device *dev;
	int status;

	ACPI_FUNCTION_TRACE("free_hotkey_device");

	if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
		status =
		    acpi_bus_get_device(key->event_hotkey.bus_handle, &dev);
		if (dev->handle)
			acpi_remove_notify_handler(dev->handle,
						   ACPI_SYSTEM_NOTIFY,
						   acpi_hotkey_notify_handler);
	} else
		remove_proc_entry(key->poll_hotkey.action_method,
				  hotkey_proc_dir);
	kfree(key);
	return_VOID;
}

static int
init_hotkey_device(union acpi_hotkey *key, char *bus_str, char *action_str,
		   char *method, int std_num, int external_num)
{
	ACPI_FUNCTION_TRACE("init_hotkey_device");

	key->link.hotkey_type = ACPI_HOTKEY_EVENT;
	key->link.hotkey_standard_num = std_num;
	key->event_hotkey.flag = 0;
	if (is_valid_acpi_path(bus_str))
		acpi_get_handle((acpi_handle) 0,
				bus_str, &(key->event_hotkey.bus_handle));
	else
		return_VALUE(-ENODEV);
	key->event_hotkey.external_hotkey_num = external_num;
	if (is_valid_acpi_path(action_str))
		acpi_get_handle((acpi_handle) 0,
				action_str, &(key->event_hotkey.action_handle));
	key->event_hotkey.action_method = kmalloc(sizeof(method), GFP_KERNEL);
	strcpy(key->event_hotkey.action_method, method);

	return_VALUE(!is_valid_hotkey(key));
}

static int
init_poll_hotkey_device(union acpi_hotkey *key,
			char *poll_str,
			char *poll_method,
			char *action_str, char *action_method, int std_num)
{
	ACPI_FUNCTION_TRACE("init_poll_hotkey_device");

	key->link.hotkey_type = ACPI_HOTKEY_POLLING;
	key->link.hotkey_standard_num = std_num;
	key->poll_hotkey.flag = 0;
	if (is_valid_acpi_path(poll_str))
		acpi_get_handle((acpi_handle) 0,
				poll_str, &(key->poll_hotkey.poll_handle));
	else
		return_VALUE(-ENODEV);
	key->poll_hotkey.poll_method = poll_method;
	if (is_valid_acpi_path(action_str))
		acpi_get_handle((acpi_handle) 0,
				action_str, &(key->poll_hotkey.action_handle));
	key->poll_hotkey.action_method =
	    kmalloc(sizeof(action_method), GFP_KERNEL);
	strcpy(key->poll_hotkey.action_method, action_method);
	key->poll_hotkey.poll_result =
	    (union acpi_object *)kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	return_VALUE(is_valid_hotkey(key));
}

static int check_hotkey_valid(union acpi_hotkey *key,
			      struct acpi_hotkey_list *list)
{
	ACPI_FUNCTION_TRACE("check_hotkey_valid");
	return_VALUE(0);
}

static int hotkey_open_config(struct inode *inode, struct file *file)
{
	ACPI_FUNCTION_TRACE("hotkey_open_config");
	return_VALUE(single_open
		     (file, hotkey_config_seq_show, PDE(inode)->data));
}

static int hotkey_config_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
	struct list_head *entries, *next;
	char bus_name[ACPI_PATHNAME_MAX] = { 0 };
	char action_name[ACPI_PATHNAME_MAX] = { 0 };
	struct acpi_buffer bus = { ACPI_PATHNAME_MAX, bus_name };
	struct acpi_buffer act = { ACPI_PATHNAME_MAX, action_name };

	ACPI_FUNCTION_TRACE(("hotkey_config_seq_show"));

	if (!hotkey_list)
		goto end;

	list_for_each_safe(entries, next, hotkey_list->entries) {
		union acpi_hotkey *key =
		    container_of(entries, union acpi_hotkey, entries);
		if (key->link.hotkey_type == ACPI_HOTKEY_EVENT) {
			acpi_get_name(key->event_hotkey.bus_handle,
				      ACPI_NAME_TYPE_MAX, &bus);
			acpi_get_name(key->event_hotkey.action_handle,
				      ACPI_NAME_TYPE_MAX, &act);
			seq_printf(seq, "%s:%s:%s:%d:%d", bus_name,
				   action_name,
				   key->event_hotkey.action_method,
				   key->link.hotkey_standard_num,
				   key->event_hotkey.external_hotkey_num);
		} /* ACPI_HOTKEY_POLLING */
		else {
			acpi_get_name(key->poll_hotkey.poll_handle,
				      ACPI_NAME_TYPE_MAX, &bus);
			acpi_get_name(key->poll_hotkey.action_handle,
				      ACPI_NAME_TYPE_MAX, &act);
			seq_printf(seq, "%s:%s:%s:%s:%d", bus_name,
				   key->poll_hotkey.poll_method,
				   action_name,
				   key->poll_hotkey.action_method,
				   key->link.hotkey_standard_num);
		}
	}
	seq_puts(seq, "\n");
      end:
	return_VALUE(0);
}

static int
get_parms(char *config_record,
	  int *cmd,
	  char *bus_handle,
	  char *bus_method,
	  char *action_handle,
	  char *method, int *internal_event_num, int *external_event_num)
{
	char *tmp, *tmp1;
	ACPI_FUNCTION_TRACE(("get_parms"));

	sscanf(config_record, "%d", cmd);

	tmp = strchr(config_record, ':');
	tmp++;
	tmp1 = strchr(tmp, ':');
	strncpy(bus_handle, tmp, tmp1 - tmp);
	bus_handle[tmp1 - tmp] = 0;

	tmp = tmp1;
	tmp++;
	tmp1 = strchr(tmp, ':');
	strncpy(bus_method, tmp, tmp1 - tmp);
	bus_method[tmp1 - tmp] = 0;

	tmp = tmp1;
	tmp++;
	tmp1 = strchr(tmp, ':');
	strncpy(action_handle, tmp, tmp1 - tmp);
	action_handle[tmp1 - tmp] = 0;

	tmp = tmp1;
	tmp++;
	tmp1 = strchr(tmp, ':');
	strncpy(method, tmp, tmp1 - tmp);
	method[tmp1 - tmp] = 0;

	sscanf(tmp1 + 1, "%d:%d", internal_event_num, external_event_num);
	return_VALUE(6);
}

/*  count is length for one input record */
static ssize_t hotkey_write_config(struct file *file,
				   const char __user * buffer,
				   size_t count, loff_t * data)
{
	struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
	char config_record[MAX_CONFIG_RECORD_LEN];
	char bus_handle[MAX_NAME_PATH_LEN];
	char bus_method[MAX_NAME_PATH_LEN];
	char action_handle[MAX_NAME_PATH_LEN];
	char method[20];
	int cmd, internal_event_num, external_event_num;
	int ret = 0;
	union acpi_hotkey *key = NULL;

	ACPI_FUNCTION_TRACE(("hotkey_write_config"));

	if (!hotkey_list || count > MAX_CONFIG_RECORD_LEN) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid arguments\n"));
		return_VALUE(-EINVAL);
	}

	if (copy_from_user(config_record, buffer, count)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data \n"));
		return_VALUE(-EINVAL);
	}
	config_record[count] = '\0';

	ret = get_parms(config_record,
			&cmd,
			bus_handle,
			bus_method,
			action_handle,
			method, &internal_event_num, &external_event_num);
	if (ret != 6) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Invalid data format ret=%d\n", ret));
		return_VALUE(-EINVAL);
	}

	key = kmalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
	ret = init_hotkey_device(key, bus_handle, action_handle, method,
				 internal_event_num, external_event_num);

	if (ret || check_hotkey_valid(key, hotkey_list)) {
		kfree(key);
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid hotkey \n"));
		return_VALUE(-EINVAL);
	}
	switch (cmd) {
	case 0:
		hotkey_add(key);
		break;
	case 1:
		hotkey_remove(key);
		free_hotkey_device(key);
		break;
	case 2:
		hotkey_update(key);
		break;
	default:
		break;
	}
	return_VALUE(count);
}

/*  count is length for one input record */
static ssize_t hotkey_write_poll_config(struct file *file,
					const char __user * buffer,
					size_t count, loff_t * data)
{
	struct seq_file *m = (struct seq_file *)file->private_data;
	struct acpi_hotkey_list *hotkey_list =
	    (struct acpi_hotkey_list *)m->private;

	char config_record[MAX_CONFIG_RECORD_LEN];
	char polling_handle[MAX_NAME_PATH_LEN];
	char action_handle[MAX_NAME_PATH_LEN];
	char poll_method[20], action_method[20];
	int ret, internal_event_num, cmd, external_event_num;
	union acpi_hotkey *key = NULL;

	ACPI_FUNCTION_TRACE("hotkey_write_poll_config");

	if (!hotkey_list || count > MAX_CONFIG_RECORD_LEN) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid arguments\n"));
		return_VALUE(-EINVAL);
	}

	if (copy_from_user(config_record, buffer, count)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data \n"));
		return_VALUE(-EINVAL);
	}
	config_record[count] = '\0';

	ret = get_parms(config_record,
			&cmd,
			polling_handle,
			poll_method,
			action_handle,
			action_method,
			&internal_event_num, &external_event_num);

	if (ret != 6) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
		return_VALUE(-EINVAL);
	}

	key = kmalloc(sizeof(union acpi_hotkey), GFP_KERNEL);
	ret = init_poll_hotkey_device(key, polling_handle, poll_method,
				      action_handle, action_method,
				      internal_event_num);
	if (ret || check_hotkey_valid(key, hotkey_list)) {
		kfree(key);
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid hotkey \n"));
		return_VALUE(-EINVAL);
	}
	switch (cmd) {
	case 0:
		hotkey_add(key);
		break;
	case 1:
		hotkey_remove(key);
		break;
	case 2:
		hotkey_update(key);
		break;
	default:
		break;
	}
	return_VALUE(count);
}

/*  
 * This function evaluates an ACPI method, given an int as parameter, the
 * method is searched within the scope of the handle, can be NULL. The output
 * of the method is written is output, which can also be NULL
 *
 * returns 1 if write is successful, 0 else.
 */
static int write_acpi_int(acpi_handle handle, const char *method, int val,
			  struct acpi_buffer *output)
{
	struct acpi_object_list params;	/* list of input parameters (an int here) */
	union acpi_object in_obj;	/* the only param we use */
	acpi_status status;

	ACPI_FUNCTION_TRACE("write_acpi_int");
	params.count = 1;
	params.pointer = &in_obj;
	in_obj.type = ACPI_TYPE_INTEGER;
	in_obj.integer.value = val;

	status = acpi_evaluate_object(handle, (char *)method, &params, output);

	return_VALUE(status == AE_OK);
}

static int read_acpi_int(acpi_handle handle, const char *method, int *val)
{
	struct acpi_buffer output;
	union acpi_object out_obj;
	acpi_status status;

	ACPI_FUNCTION_TRACE("read_acpi_int");
	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
	*val = out_obj.integer.value;
	return_VALUE((status == AE_OK)
		     && (out_obj.type == ACPI_TYPE_INTEGER));
}

static acpi_handle
get_handle_from_hotkeylist(struct acpi_hotkey_list *hotkey_list, int event_num)
{
	struct list_head *entries, *next;

	list_for_each_safe(entries, next, hotkey_list->entries) {
		union acpi_hotkey *key =
		    container_of(entries, union acpi_hotkey, entries);
		if (key->link.hotkey_type == ACPI_HOTKEY_EVENT
		    && key->link.hotkey_standard_num == event_num) {
			return (key->event_hotkey.action_handle);
		}
	}
	return (NULL);
}

static
char *get_method_from_hotkeylist(struct acpi_hotkey_list *hotkey_list,
				 int event_num)
{
	struct list_head *entries, *next;

	list_for_each_safe(entries, next, hotkey_list->entries) {
		union acpi_hotkey *key =
		    container_of(entries, union acpi_hotkey, entries);

		if (key->link.hotkey_type == ACPI_HOTKEY_EVENT &&
		    key->link.hotkey_standard_num == event_num)
			return (key->event_hotkey.action_method);
	}
	return (NULL);
}

static struct acpi_polling_hotkey *get_hotkey_by_event(struct
						       acpi_hotkey_list
						       *hotkey_list, int event)
{
	struct list_head *entries, *next;

	list_for_each_safe(entries, next, hotkey_list->entries) {
		union acpi_hotkey *key =
		    container_of(entries, union acpi_hotkey, entries);
		if (key->link.hotkey_type == ACPI_HOTKEY_POLLING
		    && key->link.hotkey_standard_num == event) {
			return (&key->poll_hotkey);
		}
	}
	return (NULL);
}

/*  
 * user call AML method interface:
 * Call convention:
 * echo "event_num: arg type : value"
 * example: echo "1:1:30" > /proc/acpi/action
 * Just support 1 integer arg passing to AML method
 */

static ssize_t hotkey_execute_aml_method(struct file *file,
					 const char __user * buffer,
					 size_t count, loff_t * data)
{
	struct acpi_hotkey_list *hotkey_list = &global_hotkey_list;
	char arg[MAX_CALL_PARM];
	int event, type, value;

	char *method;
	acpi_handle handle;

	ACPI_FUNCTION_TRACE("hotkey_execte_aml_method");

	if (!hotkey_list || count > MAX_CALL_PARM) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 1"));
		return_VALUE(-EINVAL);
	}

	if (copy_from_user(arg, buffer, count)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 2"));
		return_VALUE(-EINVAL);
	}

	arg[count] = '\0';

	if (sscanf(arg, "%d:%d:%d", &event, &type, &value) != 3) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument 3"));
		return_VALUE(-EINVAL);
	}

	if (type == ACPI_TYPE_INTEGER) {
		handle = get_handle_from_hotkeylist(hotkey_list, event);
		method = (char *)get_method_from_hotkeylist(hotkey_list, event);
		if (IS_EVENT(event))
			write_acpi_int(handle, method, value, NULL);
		else if (IS_POLL(event)) {
			struct acpi_polling_hotkey *key;
			key = (struct acpi_polling_hotkey *)
			    get_hotkey_by_event(hotkey_list, event);
			read_acpi_int(handle, method, key->poll_result);
		}
	} else {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Not supported"));
		return_VALUE(-EINVAL);
	}

	return_VALUE(count);
}

static int __init hotkey_init(void)
{
	int result;
	mode_t mode = S_IFREG | S_IRUGO | S_IWUGO;

	ACPI_FUNCTION_TRACE("hotkey_init");

	if (acpi_disabled)
		return -ENODEV;

	if (acpi_specific_hotkey_enabled) {
		printk("Using specific hotkey driver\n");
		return -ENODEV;
	}

	hotkey_proc_dir = proc_mkdir(HOTKEY_PROC, acpi_root_dir);
	if (!hotkey_proc_dir) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Hotkey: Unable to create %s entry\n",
				  HOTKEY_PROC));
		return (-ENODEV);
	}
	hotkey_proc_dir->owner = THIS_MODULE;

	hotkey_config =
	    create_proc_entry(HOTKEY_EV_CONFIG, mode, hotkey_proc_dir);
	if (!hotkey_config) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Hotkey: Unable to create %s entry\n",
				  HOTKEY_EV_CONFIG));
		return (-ENODEV);
	} else {
		hotkey_config->proc_fops = &hotkey_config_fops;
		hotkey_config->data = &global_hotkey_list;
		hotkey_config->owner = THIS_MODULE;
		hotkey_config->uid = 0;
		hotkey_config->gid = 0;
	}

	hotkey_poll_config =
	    create_proc_entry(HOTKEY_PL_CONFIG, mode, hotkey_proc_dir);
	if (!hotkey_poll_config) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Hotkey: Unable to create %s entry\n",
				  HOTKEY_EV_CONFIG));
		return (-ENODEV);
	} else {
		hotkey_poll_config->proc_fops = &hotkey_poll_config_fops;
		hotkey_poll_config->data = &global_hotkey_list;
		hotkey_poll_config->owner = THIS_MODULE;
		hotkey_poll_config->uid = 0;
		hotkey_poll_config->gid = 0;
	}

	hotkey_action = create_proc_entry(HOTKEY_ACTION, mode, hotkey_proc_dir);
	if (!hotkey_action) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Hotkey: Unable to create %s entry\n",
				  HOTKEY_ACTION));
		return (-ENODEV);
	} else {
		hotkey_action->proc_fops = &hotkey_action_fops;
		hotkey_action->owner = THIS_MODULE;
		hotkey_action->uid = 0;
		hotkey_action->gid = 0;
	}

	hotkey_info = create_proc_entry(HOTKEY_INFO, mode, hotkey_proc_dir);
	if (!hotkey_info) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Hotkey: Unable to create %s entry\n",
				  HOTKEY_INFO));
		return (-ENODEV);
	} else {
		hotkey_info->proc_fops = &hotkey_info_fops;
		hotkey_info->owner = THIS_MODULE;
		hotkey_info->uid = 0;
		hotkey_info->gid = 0;
	}

	result = acpi_bus_register_driver(&hotkey_driver);
	if (result < 0) {
		remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
		return (-ENODEV);
	}
	global_hotkey_list.count = 0;
	global_hotkey_list.entries = &hotkey_entries;

	INIT_LIST_HEAD(&hotkey_entries);

	return (0);
}

static void __exit hotkey_exit(void)
{
	struct list_head *entries, *next;

	ACPI_FUNCTION_TRACE("hotkey_remove");

	list_for_each_safe(entries, next, global_hotkey_list.entries) {
		union acpi_hotkey *key =
		    container_of(entries, union acpi_hotkey, entries);

		acpi_os_wait_events_complete(NULL);
		list_del(&key->link.entries);
		global_hotkey_list.count--;
		free_hotkey_device(key);
	}
	acpi_bus_unregister_driver(&hotkey_driver);
	remove_proc_entry(HOTKEY_EV_CONFIG, hotkey_proc_dir);
	remove_proc_entry(HOTKEY_PL_CONFIG, hotkey_proc_dir);
	remove_proc_entry(HOTKEY_ACTION, hotkey_proc_dir);
	remove_proc_entry(HOTKEY_INFO, hotkey_proc_dir);
	remove_proc_entry(HOTKEY_PROC, acpi_root_dir);
	return;
}

module_init(hotkey_init);
module_exit(hotkey_exit);