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rfkill: add function to query state
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1 /*
2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the
18 * Free Software Foundation, Inc.,
19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/workqueue.h>
26 #include <linux/capability.h>
27 #include <linux/list.h>
28 #include <linux/mutex.h>
29 #include <linux/rfkill.h>
30 #include <linux/spinlock.h>
31 #include <linux/miscdevice.h>
32 #include <linux/wait.h>
33 #include <linux/poll.h>
34 #include <linux/fs.h>
35
36 #include "rfkill.h"
37
38 #define POLL_INTERVAL (5 * HZ)
39
40 #define RFKILL_BLOCK_HW BIT(0)
41 #define RFKILL_BLOCK_SW BIT(1)
42 #define RFKILL_BLOCK_SW_PREV BIT(2)
43 #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
44 RFKILL_BLOCK_SW |\
45 RFKILL_BLOCK_SW_PREV)
46 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
47
48 struct rfkill {
49 spinlock_t lock;
50
51 const char *name;
52 enum rfkill_type type;
53
54 unsigned long state;
55
56 u32 idx;
57
58 bool registered;
59 bool suspended;
60
61 const struct rfkill_ops *ops;
62 void *data;
63
64 #ifdef CONFIG_RFKILL_LEDS
65 struct led_trigger led_trigger;
66 const char *ledtrigname;
67 #endif
68
69 struct device dev;
70 struct list_head node;
71
72 struct delayed_work poll_work;
73 struct work_struct uevent_work;
74 struct work_struct sync_work;
75 };
76 #define to_rfkill(d) container_of(d, struct rfkill, dev)
77
78 struct rfkill_int_event {
79 struct list_head list;
80 struct rfkill_event ev;
81 };
82
83 struct rfkill_data {
84 struct list_head list;
85 struct list_head events;
86 struct mutex mtx;
87 wait_queue_head_t read_wait;
88 bool input_handler;
89 };
90
91
92 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
93 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
94 MODULE_DESCRIPTION("RF switch support");
95 MODULE_LICENSE("GPL");
96
97
98 /*
99 * The locking here should be made much smarter, we currently have
100 * a bit of a stupid situation because drivers might want to register
101 * the rfkill struct under their own lock, and take this lock during
102 * rfkill method calls -- which will cause an AB-BA deadlock situation.
103 *
104 * To fix that, we need to rework this code here to be mostly lock-free
105 * and only use the mutex for list manipulations, not to protect the
106 * various other global variables. Then we can avoid holding the mutex
107 * around driver operations, and all is happy.
108 */
109 static LIST_HEAD(rfkill_list); /* list of registered rf switches */
110 static DEFINE_MUTEX(rfkill_global_mutex);
111 static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
112
113 static unsigned int rfkill_default_state = 1;
114 module_param_named(default_state, rfkill_default_state, uint, 0444);
115 MODULE_PARM_DESC(default_state,
116 "Default initial state for all radio types, 0 = radio off");
117
118 static struct {
119 bool cur, def;
120 } rfkill_global_states[NUM_RFKILL_TYPES];
121
122 static unsigned long rfkill_states_default_locked;
123
124 static bool rfkill_epo_lock_active;
125
126
127 #ifdef CONFIG_RFKILL_LEDS
128 static void rfkill_led_trigger_event(struct rfkill *rfkill)
129 {
130 struct led_trigger *trigger;
131
132 if (!rfkill->registered)
133 return;
134
135 trigger = &rfkill->led_trigger;
136
137 if (rfkill->state & RFKILL_BLOCK_ANY)
138 led_trigger_event(trigger, LED_OFF);
139 else
140 led_trigger_event(trigger, LED_FULL);
141 }
142
143 static void rfkill_led_trigger_activate(struct led_classdev *led)
144 {
145 struct rfkill *rfkill;
146
147 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
148
149 rfkill_led_trigger_event(rfkill);
150 }
151
152 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
153 {
154 return rfkill->led_trigger.name;
155 }
156 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
157
158 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
159 {
160 BUG_ON(!rfkill);
161
162 rfkill->ledtrigname = name;
163 }
164 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
165
166 static int rfkill_led_trigger_register(struct rfkill *rfkill)
167 {
168 rfkill->led_trigger.name = rfkill->ledtrigname
169 ? : dev_name(&rfkill->dev);
170 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
171 return led_trigger_register(&rfkill->led_trigger);
172 }
173
174 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
175 {
176 led_trigger_unregister(&rfkill->led_trigger);
177 }
178 #else
179 static void rfkill_led_trigger_event(struct rfkill *rfkill)
180 {
181 }
182
183 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
184 {
185 return 0;
186 }
187
188 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
189 {
190 }
191 #endif /* CONFIG_RFKILL_LEDS */
192
193 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
194 enum rfkill_operation op)
195 {
196 unsigned long flags;
197
198 ev->idx = rfkill->idx;
199 ev->type = rfkill->type;
200 ev->op = op;
201
202 spin_lock_irqsave(&rfkill->lock, flags);
203 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
204 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
205 RFKILL_BLOCK_SW_PREV));
206 spin_unlock_irqrestore(&rfkill->lock, flags);
207 }
208
209 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
210 {
211 struct rfkill_data *data;
212 struct rfkill_int_event *ev;
213
214 list_for_each_entry(data, &rfkill_fds, list) {
215 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
216 if (!ev)
217 continue;
218 rfkill_fill_event(&ev->ev, rfkill, op);
219 mutex_lock(&data->mtx);
220 list_add_tail(&ev->list, &data->events);
221 mutex_unlock(&data->mtx);
222 wake_up_interruptible(&data->read_wait);
223 }
224 }
225
226 static void rfkill_event(struct rfkill *rfkill)
227 {
228 if (!rfkill->registered || rfkill->suspended)
229 return;
230
231 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
232
233 /* also send event to /dev/rfkill */
234 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
235 }
236
237 static bool __rfkill_set_hw_state(struct rfkill *rfkill,
238 bool blocked, bool *change)
239 {
240 unsigned long flags;
241 bool prev, any;
242
243 BUG_ON(!rfkill);
244
245 spin_lock_irqsave(&rfkill->lock, flags);
246 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
247 if (blocked)
248 rfkill->state |= RFKILL_BLOCK_HW;
249 else
250 rfkill->state &= ~RFKILL_BLOCK_HW;
251 *change = prev != blocked;
252 any = rfkill->state & RFKILL_BLOCK_ANY;
253 spin_unlock_irqrestore(&rfkill->lock, flags);
254
255 rfkill_led_trigger_event(rfkill);
256
257 return any;
258 }
259
260 /**
261 * rfkill_set_block - wrapper for set_block method
262 *
263 * @rfkill: the rfkill struct to use
264 * @blocked: the new software state
265 *
266 * Calls the set_block method (when applicable) and handles notifications
267 * etc. as well.
268 */
269 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
270 {
271 unsigned long flags;
272 int err;
273
274 /*
275 * Some platforms (...!) generate input events which affect the
276 * _hard_ kill state -- whenever something tries to change the
277 * current software state query the hardware state too.
278 */
279 if (rfkill->ops->query)
280 rfkill->ops->query(rfkill, rfkill->data);
281
282 spin_lock_irqsave(&rfkill->lock, flags);
283 if (rfkill->state & RFKILL_BLOCK_SW)
284 rfkill->state |= RFKILL_BLOCK_SW_PREV;
285 else
286 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
287
288 if (blocked)
289 rfkill->state |= RFKILL_BLOCK_SW;
290 else
291 rfkill->state &= ~RFKILL_BLOCK_SW;
292
293 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
294 spin_unlock_irqrestore(&rfkill->lock, flags);
295
296 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
297 return;
298
299 err = rfkill->ops->set_block(rfkill->data, blocked);
300
301 spin_lock_irqsave(&rfkill->lock, flags);
302 if (err) {
303 /*
304 * Failed -- reset status to _prev, this may be different
305 * from what set set _PREV to earlier in this function
306 * if rfkill_set_sw_state was invoked.
307 */
308 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
309 rfkill->state |= RFKILL_BLOCK_SW;
310 else
311 rfkill->state &= ~RFKILL_BLOCK_SW;
312 }
313 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
314 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
315 spin_unlock_irqrestore(&rfkill->lock, flags);
316
317 rfkill_led_trigger_event(rfkill);
318 rfkill_event(rfkill);
319 }
320
321 #ifdef CONFIG_RFKILL_INPUT
322 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
323
324 /**
325 * __rfkill_switch_all - Toggle state of all switches of given type
326 * @type: type of interfaces to be affected
327 * @state: the new state
328 *
329 * This function sets the state of all switches of given type,
330 * unless a specific switch is claimed by userspace (in which case,
331 * that switch is left alone) or suspended.
332 *
333 * Caller must have acquired rfkill_global_mutex.
334 */
335 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
336 {
337 struct rfkill *rfkill;
338
339 rfkill_global_states[type].cur = blocked;
340 list_for_each_entry(rfkill, &rfkill_list, node) {
341 if (rfkill->type != type)
342 continue;
343
344 rfkill_set_block(rfkill, blocked);
345 }
346 }
347
348 /**
349 * rfkill_switch_all - Toggle state of all switches of given type
350 * @type: type of interfaces to be affected
351 * @state: the new state
352 *
353 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
354 * Please refer to __rfkill_switch_all() for details.
355 *
356 * Does nothing if the EPO lock is active.
357 */
358 void rfkill_switch_all(enum rfkill_type type, bool blocked)
359 {
360 if (atomic_read(&rfkill_input_disabled))
361 return;
362
363 mutex_lock(&rfkill_global_mutex);
364
365 if (!rfkill_epo_lock_active)
366 __rfkill_switch_all(type, blocked);
367
368 mutex_unlock(&rfkill_global_mutex);
369 }
370
371 /**
372 * rfkill_epo - emergency power off all transmitters
373 *
374 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
375 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
376 *
377 * The global state before the EPO is saved and can be restored later
378 * using rfkill_restore_states().
379 */
380 void rfkill_epo(void)
381 {
382 struct rfkill *rfkill;
383 int i;
384
385 if (atomic_read(&rfkill_input_disabled))
386 return;
387
388 mutex_lock(&rfkill_global_mutex);
389
390 rfkill_epo_lock_active = true;
391 list_for_each_entry(rfkill, &rfkill_list, node)
392 rfkill_set_block(rfkill, true);
393
394 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
395 rfkill_global_states[i].def = rfkill_global_states[i].cur;
396 rfkill_global_states[i].cur = true;
397 }
398
399 mutex_unlock(&rfkill_global_mutex);
400 }
401
402 /**
403 * rfkill_restore_states - restore global states
404 *
405 * Restore (and sync switches to) the global state from the
406 * states in rfkill_default_states. This can undo the effects of
407 * a call to rfkill_epo().
408 */
409 void rfkill_restore_states(void)
410 {
411 int i;
412
413 if (atomic_read(&rfkill_input_disabled))
414 return;
415
416 mutex_lock(&rfkill_global_mutex);
417
418 rfkill_epo_lock_active = false;
419 for (i = 0; i < NUM_RFKILL_TYPES; i++)
420 __rfkill_switch_all(i, rfkill_global_states[i].def);
421 mutex_unlock(&rfkill_global_mutex);
422 }
423
424 /**
425 * rfkill_remove_epo_lock - unlock state changes
426 *
427 * Used by rfkill-input manually unlock state changes, when
428 * the EPO switch is deactivated.
429 */
430 void rfkill_remove_epo_lock(void)
431 {
432 if (atomic_read(&rfkill_input_disabled))
433 return;
434
435 mutex_lock(&rfkill_global_mutex);
436 rfkill_epo_lock_active = false;
437 mutex_unlock(&rfkill_global_mutex);
438 }
439
440 /**
441 * rfkill_is_epo_lock_active - returns true EPO is active
442 *
443 * Returns 0 (false) if there is NOT an active EPO contidion,
444 * and 1 (true) if there is an active EPO contition, which
445 * locks all radios in one of the BLOCKED states.
446 *
447 * Can be called in atomic context.
448 */
449 bool rfkill_is_epo_lock_active(void)
450 {
451 return rfkill_epo_lock_active;
452 }
453
454 /**
455 * rfkill_get_global_sw_state - returns global state for a type
456 * @type: the type to get the global state of
457 *
458 * Returns the current global state for a given wireless
459 * device type.
460 */
461 bool rfkill_get_global_sw_state(const enum rfkill_type type)
462 {
463 return rfkill_global_states[type].cur;
464 }
465 #endif
466
467 void rfkill_set_global_sw_state(const enum rfkill_type type, bool blocked)
468 {
469 BUG_ON(type == RFKILL_TYPE_ALL);
470
471 mutex_lock(&rfkill_global_mutex);
472
473 /* don't allow unblock when epo */
474 if (rfkill_epo_lock_active && !blocked)
475 goto out;
476
477 /* too late */
478 if (rfkill_states_default_locked & BIT(type))
479 goto out;
480
481 rfkill_states_default_locked |= BIT(type);
482
483 rfkill_global_states[type].cur = blocked;
484 rfkill_global_states[type].def = blocked;
485 out:
486 mutex_unlock(&rfkill_global_mutex);
487 }
488 EXPORT_SYMBOL(rfkill_set_global_sw_state);
489
490
491 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
492 {
493 bool ret, change;
494
495 ret = __rfkill_set_hw_state(rfkill, blocked, &change);
496
497 if (!rfkill->registered)
498 return ret;
499
500 if (change)
501 schedule_work(&rfkill->uevent_work);
502
503 return ret;
504 }
505 EXPORT_SYMBOL(rfkill_set_hw_state);
506
507 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
508 {
509 u32 bit = RFKILL_BLOCK_SW;
510
511 /* if in a ops->set_block right now, use other bit */
512 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
513 bit = RFKILL_BLOCK_SW_PREV;
514
515 if (blocked)
516 rfkill->state |= bit;
517 else
518 rfkill->state &= ~bit;
519 }
520
521 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
522 {
523 unsigned long flags;
524 bool prev, hwblock;
525
526 BUG_ON(!rfkill);
527
528 spin_lock_irqsave(&rfkill->lock, flags);
529 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
530 __rfkill_set_sw_state(rfkill, blocked);
531 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
532 blocked = blocked || hwblock;
533 spin_unlock_irqrestore(&rfkill->lock, flags);
534
535 if (!rfkill->registered)
536 return blocked;
537
538 if (prev != blocked && !hwblock)
539 schedule_work(&rfkill->uevent_work);
540
541 rfkill_led_trigger_event(rfkill);
542
543 return blocked;
544 }
545 EXPORT_SYMBOL(rfkill_set_sw_state);
546
547 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
548 {
549 unsigned long flags;
550 bool swprev, hwprev;
551
552 BUG_ON(!rfkill);
553
554 spin_lock_irqsave(&rfkill->lock, flags);
555
556 /*
557 * No need to care about prev/setblock ... this is for uevent only
558 * and that will get triggered by rfkill_set_block anyway.
559 */
560 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
561 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
562 __rfkill_set_sw_state(rfkill, sw);
563
564 spin_unlock_irqrestore(&rfkill->lock, flags);
565
566 if (!rfkill->registered)
567 return;
568
569 if (swprev != sw || hwprev != hw)
570 schedule_work(&rfkill->uevent_work);
571
572 rfkill_led_trigger_event(rfkill);
573 }
574 EXPORT_SYMBOL(rfkill_set_states);
575
576 static ssize_t rfkill_name_show(struct device *dev,
577 struct device_attribute *attr,
578 char *buf)
579 {
580 struct rfkill *rfkill = to_rfkill(dev);
581
582 return sprintf(buf, "%s\n", rfkill->name);
583 }
584
585 static const char *rfkill_get_type_str(enum rfkill_type type)
586 {
587 switch (type) {
588 case RFKILL_TYPE_WLAN:
589 return "wlan";
590 case RFKILL_TYPE_BLUETOOTH:
591 return "bluetooth";
592 case RFKILL_TYPE_UWB:
593 return "ultrawideband";
594 case RFKILL_TYPE_WIMAX:
595 return "wimax";
596 case RFKILL_TYPE_WWAN:
597 return "wwan";
598 default:
599 BUG();
600 }
601
602 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_WWAN + 1);
603 }
604
605 static ssize_t rfkill_type_show(struct device *dev,
606 struct device_attribute *attr,
607 char *buf)
608 {
609 struct rfkill *rfkill = to_rfkill(dev);
610
611 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
612 }
613
614 static ssize_t rfkill_idx_show(struct device *dev,
615 struct device_attribute *attr,
616 char *buf)
617 {
618 struct rfkill *rfkill = to_rfkill(dev);
619
620 return sprintf(buf, "%d\n", rfkill->idx);
621 }
622
623 static u8 user_state_from_blocked(unsigned long state)
624 {
625 if (state & RFKILL_BLOCK_HW)
626 return RFKILL_USER_STATE_HARD_BLOCKED;
627 if (state & RFKILL_BLOCK_SW)
628 return RFKILL_USER_STATE_SOFT_BLOCKED;
629
630 return RFKILL_USER_STATE_UNBLOCKED;
631 }
632
633 static ssize_t rfkill_state_show(struct device *dev,
634 struct device_attribute *attr,
635 char *buf)
636 {
637 struct rfkill *rfkill = to_rfkill(dev);
638 unsigned long flags;
639 u32 state;
640
641 spin_lock_irqsave(&rfkill->lock, flags);
642 state = rfkill->state;
643 spin_unlock_irqrestore(&rfkill->lock, flags);
644
645 return sprintf(buf, "%d\n", user_state_from_blocked(state));
646 }
647
648 static ssize_t rfkill_state_store(struct device *dev,
649 struct device_attribute *attr,
650 const char *buf, size_t count)
651 {
652 /*
653 * The intention was that userspace can only take control over
654 * a given device when/if rfkill-input doesn't control it due
655 * to user_claim. Since user_claim is currently unsupported,
656 * we never support changing the state from userspace -- this
657 * can be implemented again later.
658 */
659
660 return -EPERM;
661 }
662
663 static ssize_t rfkill_claim_show(struct device *dev,
664 struct device_attribute *attr,
665 char *buf)
666 {
667 return sprintf(buf, "%d\n", 0);
668 }
669
670 static ssize_t rfkill_claim_store(struct device *dev,
671 struct device_attribute *attr,
672 const char *buf, size_t count)
673 {
674 return -EOPNOTSUPP;
675 }
676
677 static struct device_attribute rfkill_dev_attrs[] = {
678 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
679 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
680 __ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
681 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
682 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
683 __ATTR_NULL
684 };
685
686 static void rfkill_release(struct device *dev)
687 {
688 struct rfkill *rfkill = to_rfkill(dev);
689
690 kfree(rfkill);
691 }
692
693 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
694 {
695 struct rfkill *rfkill = to_rfkill(dev);
696 unsigned long flags;
697 u32 state;
698 int error;
699
700 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
701 if (error)
702 return error;
703 error = add_uevent_var(env, "RFKILL_TYPE=%s",
704 rfkill_get_type_str(rfkill->type));
705 if (error)
706 return error;
707 spin_lock_irqsave(&rfkill->lock, flags);
708 state = rfkill->state;
709 spin_unlock_irqrestore(&rfkill->lock, flags);
710 error = add_uevent_var(env, "RFKILL_STATE=%d",
711 user_state_from_blocked(state));
712 return error;
713 }
714
715 void rfkill_pause_polling(struct rfkill *rfkill)
716 {
717 BUG_ON(!rfkill);
718
719 if (!rfkill->ops->poll)
720 return;
721
722 cancel_delayed_work_sync(&rfkill->poll_work);
723 }
724 EXPORT_SYMBOL(rfkill_pause_polling);
725
726 void rfkill_resume_polling(struct rfkill *rfkill)
727 {
728 BUG_ON(!rfkill);
729
730 if (!rfkill->ops->poll)
731 return;
732
733 schedule_work(&rfkill->poll_work.work);
734 }
735 EXPORT_SYMBOL(rfkill_resume_polling);
736
737 static int rfkill_suspend(struct device *dev, pm_message_t state)
738 {
739 struct rfkill *rfkill = to_rfkill(dev);
740
741 rfkill_pause_polling(rfkill);
742
743 rfkill->suspended = true;
744
745 return 0;
746 }
747
748 static int rfkill_resume(struct device *dev)
749 {
750 struct rfkill *rfkill = to_rfkill(dev);
751 bool cur;
752
753 mutex_lock(&rfkill_global_mutex);
754 cur = rfkill_global_states[rfkill->type].cur;
755 rfkill_set_block(rfkill, cur);
756 mutex_unlock(&rfkill_global_mutex);
757
758 rfkill->suspended = false;
759
760 schedule_work(&rfkill->uevent_work);
761
762 rfkill_resume_polling(rfkill);
763
764 return 0;
765 }
766
767 static struct class rfkill_class = {
768 .name = "rfkill",
769 .dev_release = rfkill_release,
770 .dev_attrs = rfkill_dev_attrs,
771 .dev_uevent = rfkill_dev_uevent,
772 .suspend = rfkill_suspend,
773 .resume = rfkill_resume,
774 };
775
776 bool rfkill_blocked(struct rfkill *rfkill)
777 {
778 unsigned long flags;
779 u32 state;
780
781 spin_lock_irqsave(&rfkill->lock, flags);
782 state = rfkill->state;
783 spin_unlock_irqrestore(&rfkill->lock, flags);
784
785 return !!(state & RFKILL_BLOCK_ANY);
786 }
787 EXPORT_SYMBOL(rfkill_blocked);
788
789
790 struct rfkill * __must_check rfkill_alloc(const char *name,
791 struct device *parent,
792 const enum rfkill_type type,
793 const struct rfkill_ops *ops,
794 void *ops_data)
795 {
796 struct rfkill *rfkill;
797 struct device *dev;
798
799 if (WARN_ON(!ops))
800 return NULL;
801
802 if (WARN_ON(!ops->set_block))
803 return NULL;
804
805 if (WARN_ON(!name))
806 return NULL;
807
808 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
809 return NULL;
810
811 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
812 if (!rfkill)
813 return NULL;
814
815 spin_lock_init(&rfkill->lock);
816 INIT_LIST_HEAD(&rfkill->node);
817 rfkill->type = type;
818 rfkill->name = name;
819 rfkill->ops = ops;
820 rfkill->data = ops_data;
821
822 dev = &rfkill->dev;
823 dev->class = &rfkill_class;
824 dev->parent = parent;
825 device_initialize(dev);
826
827 return rfkill;
828 }
829 EXPORT_SYMBOL(rfkill_alloc);
830
831 static void rfkill_poll(struct work_struct *work)
832 {
833 struct rfkill *rfkill;
834
835 rfkill = container_of(work, struct rfkill, poll_work.work);
836
837 /*
838 * Poll hardware state -- driver will use one of the
839 * rfkill_set{,_hw,_sw}_state functions and use its
840 * return value to update the current status.
841 */
842 rfkill->ops->poll(rfkill, rfkill->data);
843
844 schedule_delayed_work(&rfkill->poll_work,
845 round_jiffies_relative(POLL_INTERVAL));
846 }
847
848 static void rfkill_uevent_work(struct work_struct *work)
849 {
850 struct rfkill *rfkill;
851
852 rfkill = container_of(work, struct rfkill, uevent_work);
853
854 mutex_lock(&rfkill_global_mutex);
855 rfkill_event(rfkill);
856 mutex_unlock(&rfkill_global_mutex);
857 }
858
859 static void rfkill_sync_work(struct work_struct *work)
860 {
861 struct rfkill *rfkill;
862 bool cur;
863
864 rfkill = container_of(work, struct rfkill, sync_work);
865
866 mutex_lock(&rfkill_global_mutex);
867 cur = rfkill_global_states[rfkill->type].cur;
868 rfkill_set_block(rfkill, cur);
869 mutex_unlock(&rfkill_global_mutex);
870 }
871
872 int __must_check rfkill_register(struct rfkill *rfkill)
873 {
874 static unsigned long rfkill_no;
875 struct device *dev = &rfkill->dev;
876 int error;
877
878 BUG_ON(!rfkill);
879
880 mutex_lock(&rfkill_global_mutex);
881
882 if (rfkill->registered) {
883 error = -EALREADY;
884 goto unlock;
885 }
886
887 rfkill->idx = rfkill_no;
888 dev_set_name(dev, "rfkill%lu", rfkill_no);
889 rfkill_no++;
890
891 if (!(rfkill_states_default_locked & BIT(rfkill->type))) {
892 /* first of its kind */
893 BUILD_BUG_ON(NUM_RFKILL_TYPES >
894 sizeof(rfkill_states_default_locked) * 8);
895 rfkill_states_default_locked |= BIT(rfkill->type);
896 rfkill_global_states[rfkill->type].cur =
897 rfkill_global_states[rfkill->type].def;
898 }
899
900 list_add_tail(&rfkill->node, &rfkill_list);
901
902 error = device_add(dev);
903 if (error)
904 goto remove;
905
906 error = rfkill_led_trigger_register(rfkill);
907 if (error)
908 goto devdel;
909
910 rfkill->registered = true;
911
912 if (rfkill->ops->poll) {
913 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
914 schedule_delayed_work(&rfkill->poll_work,
915 round_jiffies_relative(POLL_INTERVAL));
916 }
917
918 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
919
920 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
921 schedule_work(&rfkill->sync_work);
922 rfkill_send_events(rfkill, RFKILL_OP_ADD);
923
924 mutex_unlock(&rfkill_global_mutex);
925 return 0;
926
927 devdel:
928 device_del(&rfkill->dev);
929 remove:
930 list_del_init(&rfkill->node);
931 unlock:
932 mutex_unlock(&rfkill_global_mutex);
933 return error;
934 }
935 EXPORT_SYMBOL(rfkill_register);
936
937 void rfkill_unregister(struct rfkill *rfkill)
938 {
939 BUG_ON(!rfkill);
940
941 if (rfkill->ops->poll)
942 cancel_delayed_work_sync(&rfkill->poll_work);
943
944 cancel_work_sync(&rfkill->uevent_work);
945 cancel_work_sync(&rfkill->sync_work);
946
947 rfkill->registered = false;
948
949 device_del(&rfkill->dev);
950
951 mutex_lock(&rfkill_global_mutex);
952 rfkill_send_events(rfkill, RFKILL_OP_DEL);
953 list_del_init(&rfkill->node);
954 mutex_unlock(&rfkill_global_mutex);
955
956 rfkill_led_trigger_unregister(rfkill);
957 }
958 EXPORT_SYMBOL(rfkill_unregister);
959
960 void rfkill_destroy(struct rfkill *rfkill)
961 {
962 if (rfkill)
963 put_device(&rfkill->dev);
964 }
965 EXPORT_SYMBOL(rfkill_destroy);
966
967 static int rfkill_fop_open(struct inode *inode, struct file *file)
968 {
969 struct rfkill_data *data;
970 struct rfkill *rfkill;
971 struct rfkill_int_event *ev, *tmp;
972
973 data = kzalloc(sizeof(*data), GFP_KERNEL);
974 if (!data)
975 return -ENOMEM;
976
977 INIT_LIST_HEAD(&data->events);
978 mutex_init(&data->mtx);
979 init_waitqueue_head(&data->read_wait);
980
981 mutex_lock(&rfkill_global_mutex);
982 mutex_lock(&data->mtx);
983 /*
984 * start getting events from elsewhere but hold mtx to get
985 * startup events added first
986 */
987 list_add(&data->list, &rfkill_fds);
988
989 list_for_each_entry(rfkill, &rfkill_list, node) {
990 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
991 if (!ev)
992 goto free;
993 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
994 list_add_tail(&ev->list, &data->events);
995 }
996 mutex_unlock(&data->mtx);
997 mutex_unlock(&rfkill_global_mutex);
998
999 file->private_data = data;
1000
1001 return nonseekable_open(inode, file);
1002
1003 free:
1004 mutex_unlock(&data->mtx);
1005 mutex_unlock(&rfkill_global_mutex);
1006 mutex_destroy(&data->mtx);
1007 list_for_each_entry_safe(ev, tmp, &data->events, list)
1008 kfree(ev);
1009 kfree(data);
1010 return -ENOMEM;
1011 }
1012
1013 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1014 {
1015 struct rfkill_data *data = file->private_data;
1016 unsigned int res = POLLOUT | POLLWRNORM;
1017
1018 poll_wait(file, &data->read_wait, wait);
1019
1020 mutex_lock(&data->mtx);
1021 if (!list_empty(&data->events))
1022 res = POLLIN | POLLRDNORM;
1023 mutex_unlock(&data->mtx);
1024
1025 return res;
1026 }
1027
1028 static bool rfkill_readable(struct rfkill_data *data)
1029 {
1030 bool r;
1031
1032 mutex_lock(&data->mtx);
1033 r = !list_empty(&data->events);
1034 mutex_unlock(&data->mtx);
1035
1036 return r;
1037 }
1038
1039 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1040 size_t count, loff_t *pos)
1041 {
1042 struct rfkill_data *data = file->private_data;
1043 struct rfkill_int_event *ev;
1044 unsigned long sz;
1045 int ret;
1046
1047 mutex_lock(&data->mtx);
1048
1049 while (list_empty(&data->events)) {
1050 if (file->f_flags & O_NONBLOCK) {
1051 ret = -EAGAIN;
1052 goto out;
1053 }
1054 mutex_unlock(&data->mtx);
1055 ret = wait_event_interruptible(data->read_wait,
1056 rfkill_readable(data));
1057 mutex_lock(&data->mtx);
1058
1059 if (ret)
1060 goto out;
1061 }
1062
1063 ev = list_first_entry(&data->events, struct rfkill_int_event,
1064 list);
1065
1066 sz = min_t(unsigned long, sizeof(ev->ev), count);
1067 ret = sz;
1068 if (copy_to_user(buf, &ev->ev, sz))
1069 ret = -EFAULT;
1070
1071 list_del(&ev->list);
1072 kfree(ev);
1073 out:
1074 mutex_unlock(&data->mtx);
1075 return ret;
1076 }
1077
1078 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1079 size_t count, loff_t *pos)
1080 {
1081 struct rfkill *rfkill;
1082 struct rfkill_event ev;
1083
1084 /* we don't need the 'hard' variable but accept it */
1085 if (count < sizeof(ev) - 1)
1086 return -EINVAL;
1087
1088 if (copy_from_user(&ev, buf, sizeof(ev) - 1))
1089 return -EFAULT;
1090
1091 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1092 return -EINVAL;
1093
1094 if (ev.type >= NUM_RFKILL_TYPES)
1095 return -EINVAL;
1096
1097 mutex_lock(&rfkill_global_mutex);
1098
1099 if (ev.op == RFKILL_OP_CHANGE_ALL) {
1100 if (ev.type == RFKILL_TYPE_ALL) {
1101 enum rfkill_type i;
1102 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1103 rfkill_global_states[i].cur = ev.soft;
1104 } else {
1105 rfkill_global_states[ev.type].cur = ev.soft;
1106 }
1107 }
1108
1109 list_for_each_entry(rfkill, &rfkill_list, node) {
1110 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1111 continue;
1112
1113 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1114 continue;
1115
1116 rfkill_set_block(rfkill, ev.soft);
1117 }
1118 mutex_unlock(&rfkill_global_mutex);
1119
1120 return count;
1121 }
1122
1123 static int rfkill_fop_release(struct inode *inode, struct file *file)
1124 {
1125 struct rfkill_data *data = file->private_data;
1126 struct rfkill_int_event *ev, *tmp;
1127
1128 mutex_lock(&rfkill_global_mutex);
1129 list_del(&data->list);
1130 mutex_unlock(&rfkill_global_mutex);
1131
1132 mutex_destroy(&data->mtx);
1133 list_for_each_entry_safe(ev, tmp, &data->events, list)
1134 kfree(ev);
1135
1136 #ifdef CONFIG_RFKILL_INPUT
1137 if (data->input_handler)
1138 atomic_dec(&rfkill_input_disabled);
1139 #endif
1140
1141 kfree(data);
1142
1143 return 0;
1144 }
1145
1146 #ifdef CONFIG_RFKILL_INPUT
1147 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1148 unsigned long arg)
1149 {
1150 struct rfkill_data *data = file->private_data;
1151
1152 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1153 return -ENOSYS;
1154
1155 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1156 return -ENOSYS;
1157
1158 mutex_lock(&data->mtx);
1159
1160 if (!data->input_handler) {
1161 atomic_inc(&rfkill_input_disabled);
1162 data->input_handler = true;
1163 }
1164
1165 mutex_unlock(&data->mtx);
1166
1167 return 0;
1168 }
1169 #endif
1170
1171 static const struct file_operations rfkill_fops = {
1172 .open = rfkill_fop_open,
1173 .read = rfkill_fop_read,
1174 .write = rfkill_fop_write,
1175 .poll = rfkill_fop_poll,
1176 .release = rfkill_fop_release,
1177 #ifdef CONFIG_RFKILL_INPUT
1178 .unlocked_ioctl = rfkill_fop_ioctl,
1179 .compat_ioctl = rfkill_fop_ioctl,
1180 #endif
1181 };
1182
1183 static struct miscdevice rfkill_miscdev = {
1184 .name = "rfkill",
1185 .fops = &rfkill_fops,
1186 .minor = MISC_DYNAMIC_MINOR,
1187 };
1188
1189 static int __init rfkill_init(void)
1190 {
1191 int error;
1192 int i;
1193
1194 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1195 rfkill_global_states[i].def = !rfkill_default_state;
1196
1197 error = class_register(&rfkill_class);
1198 if (error)
1199 goto out;
1200
1201 error = misc_register(&rfkill_miscdev);
1202 if (error) {
1203 class_unregister(&rfkill_class);
1204 goto out;
1205 }
1206
1207 #ifdef CONFIG_RFKILL_INPUT
1208 error = rfkill_handler_init();
1209 if (error) {
1210 misc_deregister(&rfkill_miscdev);
1211 class_unregister(&rfkill_class);
1212 goto out;
1213 }
1214 #endif
1215
1216 out:
1217 return error;
1218 }
1219 subsys_initcall(rfkill_init);
1220
1221 static void __exit rfkill_exit(void)
1222 {
1223 #ifdef CONFIG_RFKILL_INPUT
1224 rfkill_handler_exit();
1225 #endif
1226 misc_deregister(&rfkill_miscdev);
1227 class_unregister(&rfkill_class);
1228 }
1229 module_exit(rfkill_exit);