aboutsummaryrefslogtreecommitdiff
path: root/net/rfkill/core.c
blob: afa4f71b4c7b09399ef9e46003a2f618b24083dd (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
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
/*
 * Copyright (C) 2006 - 2007 Ivo van Doorn
 * Copyright (C) 2007 Dmitry Torokhov
 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/capability.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rfkill.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/fs.h>
#include <linux/slab.h>

#include "rfkill.h"

#define POLL_INTERVAL		(5 * HZ)

#define RFKILL_BLOCK_HW		BIT(0)
#define RFKILL_BLOCK_SW		BIT(1)
#define RFKILL_BLOCK_SW_PREV	BIT(2)
#define RFKILL_BLOCK_ANY	(RFKILL_BLOCK_HW |\
				 RFKILL_BLOCK_SW |\
				 RFKILL_BLOCK_SW_PREV)
#define RFKILL_BLOCK_SW_SETCALL	BIT(31)

struct rfkill {
	spinlock_t		lock;

	enum rfkill_type	type;

	unsigned long		state;

	u32			idx;

	bool			registered;
	bool			persistent;
	bool			polling_paused;
	bool			suspended;

	const struct rfkill_ops	*ops;
	void			*data;

#ifdef CONFIG_RFKILL_LEDS
	struct led_trigger	led_trigger;
	const char		*ledtrigname;
#endif

	struct device		dev;
	struct list_head	node;

	struct delayed_work	poll_work;
	struct work_struct	uevent_work;
	struct work_struct	sync_work;
	char			name[];
};
#define to_rfkill(d)	container_of(d, struct rfkill, dev)

struct rfkill_int_event {
	struct list_head	list;
	struct rfkill_event	ev;
};

struct rfkill_data {
	struct list_head	list;
	struct list_head	events;
	struct mutex		mtx;
	wait_queue_head_t	read_wait;
	bool			input_handler;
};


MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_DESCRIPTION("RF switch support");
MODULE_LICENSE("GPL");


/*
 * The locking here should be made much smarter, we currently have
 * a bit of a stupid situation because drivers might want to register
 * the rfkill struct under their own lock, and take this lock during
 * rfkill method calls -- which will cause an AB-BA deadlock situation.
 *
 * To fix that, we need to rework this code here to be mostly lock-free
 * and only use the mutex for list manipulations, not to protect the
 * various other global variables. Then we can avoid holding the mutex
 * around driver operations, and all is happy.
 */
static LIST_HEAD(rfkill_list);	/* list of registered rf switches */
static DEFINE_MUTEX(rfkill_global_mutex);
static LIST_HEAD(rfkill_fds);	/* list of open fds of /dev/rfkill */

static unsigned int rfkill_default_state = 1;
module_param_named(default_state, rfkill_default_state, uint, 0444);
MODULE_PARM_DESC(default_state,
		 "Default initial state for all radio types, 0 = radio off");

static struct {
	bool cur, sav;
} rfkill_global_states[NUM_RFKILL_TYPES];

static bool rfkill_epo_lock_active;


#ifdef CONFIG_RFKILL_LEDS
static void rfkill_led_trigger_event(struct rfkill *rfkill)
{
	struct led_trigger *trigger;

	if (!rfkill->registered)
		return;

	trigger = &rfkill->led_trigger;

	if (rfkill->state & RFKILL_BLOCK_ANY)
		led_trigger_event(trigger, LED_OFF);
	else
		led_trigger_event(trigger, LED_FULL);
}

static void rfkill_led_trigger_activate(struct led_classdev *led)
{
	struct rfkill *rfkill;

	rfkill = container_of(led->trigger, struct rfkill, led_trigger);

	rfkill_led_trigger_event(rfkill);
}

const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
{
	return rfkill->led_trigger.name;
}
EXPORT_SYMBOL(rfkill_get_led_trigger_name);

void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
{
	BUG_ON(!rfkill);

	rfkill->ledtrigname = name;
}
EXPORT_SYMBOL(rfkill_set_led_trigger_name);

static int rfkill_led_trigger_register(struct rfkill *rfkill)
{
	rfkill->led_trigger.name = rfkill->ledtrigname
					? : dev_name(&rfkill->dev);
	rfkill->led_trigger.activate = rfkill_led_trigger_activate;
	return led_trigger_register(&rfkill->led_trigger);
}

static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
{
	led_trigger_unregister(&rfkill->led_trigger);
}
#else
static void rfkill_led_trigger_event(struct rfkill *rfkill)
{
}

static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
{
	return 0;
}

static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
{
}
#endif /* CONFIG_RFKILL_LEDS */

static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
			      enum rfkill_operation op)
{
	unsigned long flags;

	ev->idx = rfkill->idx;
	ev->type = rfkill->type;
	ev->op = op;

	spin_lock_irqsave(&rfkill->lock, flags);
	ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
	ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
					RFKILL_BLOCK_SW_PREV));
	spin_unlock_irqrestore(&rfkill->lock, flags);
}

static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
{
	struct rfkill_data *data;
	struct rfkill_int_event *ev;

	list_for_each_entry(data, &rfkill_fds, list) {
		ev = kzalloc(sizeof(*ev), GFP_KERNEL);
		if (!ev)
			continue;
		rfkill_fill_event(&ev->ev, rfkill, op);
		mutex_lock(&data->mtx);
		list_add_tail(&ev->list, &data->events);
		mutex_unlock(&data->mtx);
		wake_up_interruptible(&data->read_wait);
	}
}

static void rfkill_event(struct rfkill *rfkill)
{
	if (!rfkill->registered)
		return;

	kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);

	/* also send event to /dev/rfkill */
	rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
}

/**
 * rfkill_set_block - wrapper for set_block method
 *
 * @rfkill: the rfkill struct to use
 * @blocked: the new software state
 *
 * Calls the set_block method (when applicable) and handles notifications
 * etc. as well.
 */
static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
{
	unsigned long flags;
	bool prev, curr;
	int err;

	if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
		return;

	/*
	 * Some platforms (...!) generate input events which affect the
	 * _hard_ kill state -- whenever something tries to change the
	 * current software state query the hardware state too.
	 */
	if (rfkill->ops->query)
		rfkill->ops->query(rfkill, rfkill->data);

	spin_lock_irqsave(&rfkill->lock, flags);
	prev = rfkill->state & RFKILL_BLOCK_SW;

	if (prev)
		rfkill->state |= RFKILL_BLOCK_SW_PREV;
	else
		rfkill->state &= ~RFKILL_BLOCK_SW_PREV;

	if (blocked)
		rfkill->state |= RFKILL_BLOCK_SW;
	else
		rfkill->state &= ~RFKILL_BLOCK_SW;

	rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
	spin_unlock_irqrestore(&rfkill->lock, flags);

	err = rfkill->ops->set_block(rfkill->data, blocked);

	spin_lock_irqsave(&rfkill->lock, flags);
	if (err) {
		/*
		 * Failed -- reset status to _PREV, which may be different
		 * from what we have set _PREV to earlier in this function
		 * if rfkill_set_sw_state was invoked.
		 */
		if (rfkill->state & RFKILL_BLOCK_SW_PREV)
			rfkill->state |= RFKILL_BLOCK_SW;
		else
			rfkill->state &= ~RFKILL_BLOCK_SW;
	}
	rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
	rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
	curr = rfkill->state & RFKILL_BLOCK_SW;
	spin_unlock_irqrestore(&rfkill->lock, flags);

	rfkill_led_trigger_event(rfkill);

	if (prev != curr)
		rfkill_event(rfkill);
}

static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
{
	int i;

	if (type != RFKILL_TYPE_ALL) {
		rfkill_global_states[type].cur = blocked;
		return;
	}

	for (i = 0; i < NUM_RFKILL_TYPES; i++)
		rfkill_global_states[i].cur = blocked;
}

#ifdef CONFIG_RFKILL_INPUT
static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);

/**
 * __rfkill_switch_all - Toggle state of all switches of given type
 * @type: type of interfaces to be affected
 * @blocked: the new state
 *
 * This function sets the state of all switches of given type,
 * unless a specific switch is suspended.
 *
 * Caller must have acquired rfkill_global_mutex.
 */
static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
{
	struct rfkill *rfkill;

	rfkill_update_global_state(type, blocked);
	list_for_each_entry(rfkill, &rfkill_list, node) {
		if (rfkill->type != type && type != RFKILL_TYPE_ALL)
			continue;

		rfkill_set_block(rfkill, blocked);
	}
}

/**
 * rfkill_switch_all - Toggle state of all switches of given type
 * @type: type of interfaces to be affected
 * @blocked: the new state
 *
 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
 * Please refer to __rfkill_switch_all() for details.
 *
 * Does nothing if the EPO lock is active.
 */
void rfkill_switch_all(enum rfkill_type type, bool blocked)
{
	if (atomic_read(&rfkill_input_disabled))
		return;

	mutex_lock(&rfkill_global_mutex);

	if (!rfkill_epo_lock_active)
		__rfkill_switch_all(type, blocked);

	mutex_unlock(&rfkill_global_mutex);
}

/**
 * rfkill_epo - emergency power off all transmitters
 *
 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
 *
 * The global state before the EPO is saved and can be restored later
 * using rfkill_restore_states().
 */
void rfkill_epo(void)
{
	struct rfkill *rfkill;
	int i;

	if (atomic_read(&rfkill_input_disabled))
		return;

	mutex_lock(&rfkill_global_mutex);

	rfkill_epo_lock_active = true;
	list_for_each_entry(rfkill, &rfkill_list, node)
		rfkill_set_block(rfkill, true);

	for (i = 0; i < NUM_RFKILL_TYPES; i++) {
		rfkill_global_states[i].sav = rfkill_global_states[i].cur;
		rfkill_global_states[i].cur = true;
	}

	mutex_unlock(&rfkill_global_mutex);
}

/**
 * rfkill_restore_states - restore global states
 *
 * Restore (and sync switches to) the global state from the
 * states in rfkill_default_states.  This can undo the effects of
 * a call to rfkill_epo().
 */
void rfkill_restore_states(void)
{
	int i;

	if (atomic_read(&rfkill_input_disabled))
		return;

	mutex_lock(&rfkill_global_mutex);

	rfkill_epo_lock_active = false;
	for (i = 0; i < NUM_RFKILL_TYPES; i++)
		__rfkill_switch_all(i, rfkill_global_states[i].sav);
	mutex_unlock(&rfkill_global_mutex);
}

/**
 * rfkill_remove_epo_lock - unlock state changes
 *
 * Used by rfkill-input manually unlock state changes, when
 * the EPO switch is deactivated.
 */
void rfkill_remove_epo_lock(void)
{
	if (atomic_read(&rfkill_input_disabled))
		return;

	mutex_lock(&rfkill_global_mutex);
	rfkill_epo_lock_active = false;
	mutex_unlock(&rfkill_global_mutex);
}

/**
 * rfkill_is_epo_lock_active - returns true EPO is active
 *
 * Returns 0 (false) if there is NOT an active EPO contidion,
 * and 1 (true) if there is an active EPO contition, which
 * locks all radios in one of the BLOCKED states.
 *
 * Can be called in atomic context.
 */
bool rfkill_is_epo_lock_active(void)
{
	return rfkill_epo_lock_active;
}

/**
 * rfkill_get_global_sw_state - returns global state for a type
 * @type: the type to get the global state of
 *
 * Returns the current global state for a given wireless
 * device type.
 */
bool rfkill_get_global_sw_state(const enum rfkill_type type)
{
	return rfkill_global_states[type].cur;
}
#endif

bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
{
	unsigned long flags;
	bool ret, prev;

	BUG_ON(!rfkill);

	spin_lock_irqsave(&rfkill->lock, flags);
	prev = !!(rfkill->state & RFKILL_BLOCK_HW);
	if (blocked)
		rfkill->state |= RFKILL_BLOCK_HW;
	else
		rfkill->state &= ~RFKILL_BLOCK_HW;
	ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
	spin_unlock_irqrestore(&rfkill->lock, flags);

	rfkill_led_trigger_event(rfkill);

	if (rfkill->registered && prev != blocked)
		schedule_work(&rfkill->uevent_work);

	return ret;
}
EXPORT_SYMBOL(rfkill_set_hw_state);

static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
{
	u32 bit = RFKILL_BLOCK_SW;

	/* if in a ops->set_block right now, use other bit */
	if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
		bit = RFKILL_BLOCK_SW_PREV;

	if (blocked)
		rfkill->state |= bit;
	else
		rfkill->state &= ~bit;
}

bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
{
	unsigned long flags;
	bool prev, hwblock;

	BUG_ON(!rfkill);

	spin_lock_irqsave(&rfkill->lock, flags);
	prev = !!(rfkill->state & RFKILL_BLOCK_SW);
	__rfkill_set_sw_state(rfkill, blocked);
	hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
	blocked = blocked || hwblock;
	spin_unlock_irqrestore(&rfkill->lock, flags);

	if (!rfkill->registered)
		return blocked;

	if (prev != blocked && !hwblock)
		schedule_work(&rfkill->uevent_work);

	rfkill_led_trigger_event(rfkill);

	return blocked;
}
EXPORT_SYMBOL(rfkill_set_sw_state);

void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
{
	unsigned long flags;

	BUG_ON(!rfkill);
	BUG_ON(rfkill->registered);

	spin_lock_irqsave(&rfkill->lock, flags);
	__rfkill_set_sw_state(rfkill, blocked);
	rfkill->persistent = true;
	spin_unlock_irqrestore(&rfkill->lock, flags);
}
EXPORT_SYMBOL(rfkill_init_sw_state);

void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
{
	unsigned long flags;
	bool swprev, hwprev;

	BUG_ON(!rfkill);

	spin_lock_irqsave(&rfkill->lock, flags);

	/*
	 * No need to care about prev/setblock ... this is for uevent only
	 * and that will get triggered by rfkill_set_block anyway.
	 */
	swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
	hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
	__rfkill_set_sw_state(rfkill, sw);
	if (hw)
		rfkill->state |= RFKILL_BLOCK_HW;
	else
		rfkill->state &= ~RFKILL_BLOCK_HW;

	spin_unlock_irqrestore(&rfkill->lock, flags);

	if (!rfkill->registered) {
		rfkill->persistent = true;
	} else {
		if (swprev != sw || hwprev != hw)
			schedule_work(&rfkill->uevent_work);

		rfkill_led_trigger_event(rfkill);
	}
}
EXPORT_SYMBOL(rfkill_set_states);

static const char * const rfkill_types[] = {
	NULL, /* RFKILL_TYPE_ALL */
	"wlan",
	"bluetooth",
	"ultrawideband",
	"wimax",
	"wwan",
	"gps",
	"fm",
	"nfc",
};

enum rfkill_type rfkill_find_type(const char *name)
{
	int i;

	BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);

	if (!name)
		return RFKILL_TYPE_ALL;

	for (i = 1; i < NUM_RFKILL_TYPES; i++)
		if (!strcmp(name, rfkill_types[i]))
			return i;
	return RFKILL_TYPE_ALL;
}
EXPORT_SYMBOL(rfkill_find_type);

static ssize_t name_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct rfkill *rfkill = to_rfkill(dev);

	return sprintf(buf, "%s\n", rfkill->name);
}
static DEVICE_ATTR_RO(name);

static ssize_t type_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct rfkill *rfkill = to_rfkill(dev);

	return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
}
static DEVICE_ATTR_RO(type);

static ssize_t index_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct rfkill *rfkill = to_rfkill(dev);

	return sprintf(buf, "%d\n", rfkill->idx);
}
static DEVICE_ATTR_RO(index);

static ssize_t persistent_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct rfkill *rfkill = to_rfkill(dev);

	return sprintf(buf, "%d\n", rfkill->persistent);
}
static DEVICE_ATTR_RO(persistent);

static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct rfkill *rfkill = to_rfkill(dev);

	return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
}
static DEVICE_ATTR_RO(hard);

static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct rfkill *rfkill = to_rfkill(dev);

	return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
}

static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct rfkill *rfkill = to_rfkill(dev);
	unsigned long state;
	int err;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	err = kstrtoul(buf, 0, &state);
	if (err)
		return err;

	if (state > 1 )
		return -EINVAL;

	mutex_lock(&rfkill_global_mutex);
	rfkill_set_block(rfkill, state);
	mutex_unlock(&rfkill_global_mutex);

	return count;
}
static DEVICE_ATTR_RW(soft);

static u8 user_state_from_blocked(unsigned long state)
{
	if (state & RFKILL_BLOCK_HW)
		return RFKILL_USER_STATE_HARD_BLOCKED;
	if (state & RFKILL_BLOCK_SW)
		return RFKILL_USER_STATE_SOFT_BLOCKED;

	return RFKILL_USER_STATE_UNBLOCKED;
}

static ssize_t state_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct rfkill *rfkill = to_rfkill(dev);

	return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
}

static ssize_t state_store(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct rfkill *rfkill = to_rfkill(dev);
	unsigned long state;
	int err;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	err = kstrtoul(buf, 0, &state);
	if (err)
		return err;

	if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
	    state != RFKILL_USER_STATE_UNBLOCKED)
		return -EINVAL;

	mutex_lock(&rfkill_global_mutex);
	rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
	mutex_unlock(&rfkill_global_mutex);

	return count;
}
static DEVICE_ATTR_RW(state);

static struct attribute *rfkill_dev_attrs[] = {
	&dev_attr_name.attr,
	&dev_attr_type.attr,
	&dev_attr_index.attr,
	&dev_attr_persistent.attr,
	&dev_attr_state.attr,
	&dev_attr_soft.attr,
	&dev_attr_hard.attr,
	NULL,
};
ATTRIBUTE_GROUPS(rfkill_dev);

static void rfkill_release(struct device *dev)
{
	struct rfkill *rfkill = to_rfkill(dev);

	kfree(rfkill);
}

static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct rfkill *rfkill = to_rfkill(dev);
	unsigned long flags;
	u32 state;
	int error;

	error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
	if (error)
		return error;
	error = add_uevent_var(env, "RFKILL_TYPE=%s",
			       rfkill_types[rfkill->type]);
	if (error)
		return error;
	spin_lock_irqsave(&rfkill->lock, flags);
	state = rfkill->state;
	spin_unlock_irqrestore(&rfkill->lock, flags);
	error = add_uevent_var(env, "RFKILL_STATE=%d",
			       user_state_from_blocked(state));
	return error;
}

void rfkill_pause_polling(struct rfkill *rfkill)
{
	BUG_ON(!rfkill);

	if (!rfkill->ops->poll)
		return;

	rfkill->polling_paused = true;
	cancel_delayed_work_sync(&rfkill->poll_work);
}
EXPORT_SYMBOL(rfkill_pause_polling);

void rfkill_resume_polling(struct rfkill *rfkill)
{
	BUG_ON(!rfkill);

	if (!rfkill->ops->poll)
		return;

	rfkill->polling_paused = false;

	if (rfkill->suspended)
		return;

	queue_delayed_work(system_power_efficient_wq,
			   &rfkill->poll_work, 0);
}
EXPORT_SYMBOL(rfkill_resume_polling);

#ifdef CONFIG_PM_SLEEP
static int rfkill_suspend(struct device *dev)
{
	struct rfkill *rfkill = to_rfkill(dev);

	rfkill->suspended = true;
	cancel_delayed_work_sync(&rfkill->poll_work);

	return 0;
}

static int rfkill_resume(struct device *dev)
{
	struct rfkill *rfkill = to_rfkill(dev);
	bool cur;

	rfkill->suspended = false;

	if (!rfkill->persistent) {
		cur = !!(rfkill->state & RFKILL_BLOCK_SW);
		rfkill_set_block(rfkill, cur);
	}

	if (rfkill->ops->poll && !rfkill->polling_paused)
		queue_delayed_work(system_power_efficient_wq,
				   &rfkill->poll_work, 0);

	return 0;
}

static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
#define RFKILL_PM_OPS (&rfkill_pm_ops)
#else
#define RFKILL_PM_OPS NULL
#endif

static struct class rfkill_class = {
	.name		= "rfkill",
	.dev_release	= rfkill_release,
	.dev_groups	= rfkill_dev_groups,
	.dev_uevent	= rfkill_dev_uevent,
	.pm		= RFKILL_PM_OPS,
};

bool rfkill_blocked(struct rfkill *rfkill)
{
	unsigned long flags;
	u32 state;

	spin_lock_irqsave(&rfkill->lock, flags);
	state = rfkill->state;
	spin_unlock_irqrestore(&rfkill->lock, flags);

	return !!(state & RFKILL_BLOCK_ANY);
}
EXPORT_SYMBOL(rfkill_blocked);


struct rfkill * __must_check rfkill_alloc(const char *name,
					  struct device *parent,
					  const enum rfkill_type type,
					  const struct rfkill_ops *ops,
					  void *ops_data)
{
	struct rfkill *rfkill;
	struct device *dev;

	if (WARN_ON(!ops))
		return NULL;

	if (WARN_ON(!ops->set_block))
		return NULL;

	if (WARN_ON(!name))
		return NULL;

	if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
		return NULL;

	rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
	if (!rfkill)
		return NULL;

	spin_lock_init(&rfkill->lock);
	INIT_LIST_HEAD(&rfkill->node);
	rfkill->type = type;
	strcpy(rfkill->name, name);
	rfkill->ops = ops;
	rfkill->data = ops_data;

	dev = &rfkill->dev;
	dev->class = &rfkill_class;
	dev->parent = parent;
	device_initialize(dev);

	return rfkill;
}
EXPORT_SYMBOL(rfkill_alloc);

static void rfkill_poll(struct work_struct *work)
{
	struct rfkill *rfkill;

	rfkill = container_of(work, struct rfkill, poll_work.work);

	/*
	 * Poll hardware state -- driver will use one of the
	 * rfkill_set{,_hw,_sw}_state functions and use its
	 * return value to update the current status.
	 */
	rfkill->ops->poll(rfkill, rfkill->data);

	queue_delayed_work(system_power_efficient_wq,
		&rfkill->poll_work,
		round_jiffies_relative(POLL_INTERVAL));
}

static void rfkill_uevent_work(struct work_struct *work)
{
	struct rfkill *rfkill;

	rfkill = container_of(work, struct rfkill, uevent_work);

	mutex_lock(&rfkill_global_mutex);
	rfkill_event(rfkill);
	mutex_unlock(&rfkill_global_mutex);
}

static void rfkill_sync_work(struct work_struct *work)
{
	struct rfkill *rfkill;
	bool cur;

	rfkill = container_of(work, struct rfkill, sync_work);

	mutex_lock(&rfkill_global_mutex);
	cur = rfkill_global_states[rfkill->type].cur;
	rfkill_set_block(rfkill, cur);
	mutex_unlock(&rfkill_global_mutex);
}

int __must_check rfkill_register(struct rfkill *rfkill)
{
	static unsigned long rfkill_no;
	struct device *dev = &rfkill->dev;
	int error;

	BUG_ON(!rfkill);

	mutex_lock(&rfkill_global_mutex);

	if (rfkill->registered) {
		error = -EALREADY;
		goto unlock;
	}

	rfkill->idx = rfkill_no;
	dev_set_name(dev, "rfkill%lu", rfkill_no);
	rfkill_no++;

	list_add_tail(&rfkill->node, &rfkill_list);

	error = device_add(dev);
	if (error)
		goto remove;

	error = rfkill_led_trigger_register(rfkill);
	if (error)
		goto devdel;

	rfkill->registered = true;

	INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
	INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
	INIT_WORK(&rfkill->sync_work, rfkill_sync_work);

	if (rfkill->ops->poll)
		queue_delayed_work(system_power_efficient_wq,
			&rfkill->poll_work,
			round_jiffies_relative(POLL_INTERVAL));

	if (!rfkill->persistent || rfkill_epo_lock_active) {
		schedule_work(&rfkill->sync_work);
	} else {
#ifdef CONFIG_RFKILL_INPUT
		bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);

		if (!atomic_read(&rfkill_input_disabled))
			__rfkill_switch_all(rfkill->type, soft_blocked);
#endif
	}

	rfkill_send_events(rfkill, RFKILL_OP_ADD);

	mutex_unlock(&rfkill_global_mutex);
	return 0;

 devdel:
	device_del(&rfkill->dev);
 remove:
	list_del_init(&rfkill->node);
 unlock:
	mutex_unlock(&rfkill_global_mutex);
	return error;
}
EXPORT_SYMBOL(rfkill_register);

void rfkill_unregister(struct rfkill *rfkill)
{
	BUG_ON(!rfkill);

	if (rfkill->ops->poll)
		cancel_delayed_work_sync(&rfkill->poll_work);

	cancel_work_sync(&rfkill->uevent_work);
	cancel_work_sync(&rfkill->sync_work);

	rfkill->registered = false;

	device_del(&rfkill->dev);

	mutex_lock(&rfkill_global_mutex);
	rfkill_send_events(rfkill, RFKILL_OP_DEL);
	list_del_init(&rfkill->node);
	mutex_unlock(&rfkill_global_mutex);

	rfkill_led_trigger_unregister(rfkill);
}
EXPORT_SYMBOL(rfkill_unregister);

void rfkill_destroy(struct rfkill *rfkill)
{
	if (rfkill)
		put_device(&rfkill->dev);
}
EXPORT_SYMBOL(rfkill_destroy);

static int rfkill_fop_open(struct inode *inode, struct file *file)
{
	struct rfkill_data *data;
	struct rfkill *rfkill;
	struct rfkill_int_event *ev, *tmp;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	INIT_LIST_HEAD(&data->events);
	mutex_init(&data->mtx);
	init_waitqueue_head(&data->read_wait);

	mutex_lock(&rfkill_global_mutex);
	mutex_lock(&data->mtx);
	/*
	 * start getting events from elsewhere but hold mtx to get
	 * startup events added first
	 */

	list_for_each_entry(rfkill, &rfkill_list, node) {
		ev = kzalloc(sizeof(*ev), GFP_KERNEL);
		if (!ev)
			goto free;
		rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
		list_add_tail(&ev->list, &data->events);
	}
	list_add(&data->list, &rfkill_fds);
	mutex_unlock(&data->mtx);
	mutex_unlock(&rfkill_global_mutex);

	file->private_data = data;

	return nonseekable_open(inode, file);

 free:
	mutex_unlock(&data->mtx);
	mutex_unlock(&rfkill_global_mutex);
	mutex_destroy(&data->mtx);
	list_for_each_entry_safe(ev, tmp, &data->events, list)
		kfree(ev);
	kfree(data);
	return -ENOMEM;
}

static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
{
	struct rfkill_data *data = file->private_data;
	unsigned int res = POLLOUT | POLLWRNORM;

	poll_wait(file, &data->read_wait, wait);

	mutex_lock(&data->mtx);
	if (!list_empty(&data->events))
		res = POLLIN | POLLRDNORM;
	mutex_unlock(&data->mtx);

	return res;
}

static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
			       size_t count, loff_t *pos)
{
	struct rfkill_data *data = file->private_data;
	struct rfkill_int_event *ev;
	unsigned long sz;
	int ret;

	mutex_lock(&data->mtx);

	while (list_empty(&data->events)) {
		if (file->f_flags & O_NONBLOCK) {
			ret = -EAGAIN;
			goto out;
		}
		mutex_unlock(&data->mtx);
		/* since we re-check and it just compares pointers,
		 * using !list_empty() without locking isn't a problem
		 */
		ret = wait_event_interruptible(data->read_wait,
					       !list_empty(&data->events));
		mutex_lock(&data->mtx);

		if (ret)
			goto out;
	}

	ev = list_first_entry(&data->events, struct rfkill_int_event,
				list);

	sz = min_t(unsigned long, sizeof(ev->ev), count);
	ret = sz;
	if (copy_to_user(buf, &ev->ev, sz))
		ret = -EFAULT;

	list_del(&ev->list);
	kfree(ev);
 out:
	mutex_unlock(&data->mtx);
	return ret;
}

static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
				size_t count, loff_t *pos)
{
	struct rfkill *rfkill;
	struct rfkill_event ev;
	int ret;

	/* we don't need the 'hard' variable but accept it */
	if (count < RFKILL_EVENT_SIZE_V1 - 1)
		return -EINVAL;

	/*
	 * Copy as much data as we can accept into our 'ev' buffer,
	 * but tell userspace how much we've copied so it can determine
	 * our API version even in a write() call, if it cares.
	 */
	count = min(count, sizeof(ev));
	if (copy_from_user(&ev, buf, count))
		return -EFAULT;

	if (ev.type >= NUM_RFKILL_TYPES)
		return -EINVAL;

	mutex_lock(&rfkill_global_mutex);

	switch (ev.op) {
	case RFKILL_OP_CHANGE_ALL:
		rfkill_update_global_state(ev.type, ev.soft);
		list_for_each_entry(rfkill, &rfkill_list, node)
			if (rfkill->type == ev.type ||
			    ev.type == RFKILL_TYPE_ALL)
				rfkill_set_block(rfkill, ev.soft);
		ret = 0;
		break;
	case RFKILL_OP_CHANGE:
		list_for_each_entry(rfkill, &rfkill_list, node)
			if (rfkill->idx == ev.idx &&
			    (rfkill->type == ev.type ||
			     ev.type == RFKILL_TYPE_ALL))
				rfkill_set_block(rfkill, ev.soft);
		ret = 0;
		break;
	default:
		ret = -EINVAL;
		break;
	}

	mutex_unlock(&rfkill_global_mutex);

	return ret ?: count;
}

static int rfkill_fop_release(struct inode *inode, struct file *file)
{
	struct rfkill_data *data = file->private_data;
	struct rfkill_int_event *ev, *tmp;

	mutex_lock(&rfkill_global_mutex);
	list_del(&data->list);
	mutex_unlock(&rfkill_global_mutex);

	mutex_destroy(&data->mtx);
	list_for_each_entry_safe(ev, tmp, &data->events, list)
		kfree(ev);

#ifdef CONFIG_RFKILL_INPUT
	if (data->input_handler)
		if (atomic_dec_return(&rfkill_input_disabled) == 0)
			printk(KERN_DEBUG "rfkill: input handler enabled\n");
#endif

	kfree(data);

	return 0;
}

#ifdef CONFIG_RFKILL_INPUT
static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
			     unsigned long arg)
{
	struct rfkill_data *data = file->private_data;

	if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
		return -ENOSYS;

	if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
		return -ENOSYS;

	mutex_lock(&data->mtx);

	if (!data->input_handler) {
		if (atomic_inc_return(&rfkill_input_disabled) == 1)
			printk(KERN_DEBUG "rfkill: input handler disabled\n");
		data->input_handler = true;
	}

	mutex_unlock(&data->mtx);

	return 0;
}
#endif

static const struct file_operations rfkill_fops = {
	.owner		= THIS_MODULE,
	.open		= rfkill_fop_open,
	.read		= rfkill_fop_read,
	.write		= rfkill_fop_write,
	.poll		= rfkill_fop_poll,
	.release	= rfkill_fop_release,
#ifdef CONFIG_RFKILL_INPUT
	.unlocked_ioctl	= rfkill_fop_ioctl,
	.compat_ioctl	= rfkill_fop_ioctl,
#endif
	.llseek		= no_llseek,
};

static struct miscdevice rfkill_miscdev = {
	.name	= "rfkill",
	.fops	= &rfkill_fops,
	.minor	= MISC_DYNAMIC_MINOR,
};

static int __init rfkill_init(void)
{
	int error;

	rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);

	error = class_register(&rfkill_class);
	if (error)
		goto error_class;

	error = misc_register(&rfkill_miscdev);
	if (error)
		goto error_misc;

#ifdef CONFIG_RFKILL_INPUT
	error = rfkill_handler_init();
	if (error)
		goto error_input;
#endif

	return 0;

#ifdef CONFIG_RFKILL_INPUT
error_input:
	misc_deregister(&rfkill_miscdev);
#endif
error_misc:
	class_unregister(&rfkill_class);
error_class:
	return error;
}
subsys_initcall(rfkill_init);

static void __exit rfkill_exit(void)
{
#ifdef CONFIG_RFKILL_INPUT
	rfkill_handler_exit();
#endif
	misc_deregister(&rfkill_miscdev);
	class_unregister(&rfkill_class);
}
module_exit(rfkill_exit);