1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2006 - 2007 Ivo van Doorn
4 * Copyright (C) 2007 Dmitry Torokhov
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/workqueue.h>
12 #include <linux/capability.h>
13 #include <linux/list.h>
14 #include <linux/mutex.h>
15 #include <linux/rfkill.h>
16 #include <linux/sched.h>
17 #include <linux/spinlock.h>
18 #include <linux/device.h>
19 #include <linux/miscdevice.h>
20 #include <linux/wait.h>
21 #include <linux/poll.h>
22 #include <linux/fs.h>
23 #include <linux/slab.h>
24
25 #include "rfkill.h"
26
27 #define POLL_INTERVAL (5 * HZ)
28
29 #define RFKILL_BLOCK_HW BIT(0)
30 #define RFKILL_BLOCK_SW BIT(1)
31 #define RFKILL_BLOCK_SW_PREV BIT(2)
32 #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
33 RFKILL_BLOCK_SW |\
34 RFKILL_BLOCK_SW_PREV)
35 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
36
37 struct rfkill {
38 spinlock_t lock;
39
40 enum rfkill_type type;
41
42 unsigned long state;
43 unsigned long hard_block_reasons;
44
45 u32 idx;
46
47 bool registered;
48 bool persistent;
49 bool polling_paused;
50 bool suspended;
51 bool need_sync;
52
53 const struct rfkill_ops *ops;
54 void *data;
55
56 #ifdef CONFIG_RFKILL_LEDS
57 struct led_trigger led_trigger;
58 const char *ledtrigname;
59 #endif
60
61 struct device dev;
62 struct list_head node;
63
64 struct delayed_work poll_work;
65 struct work_struct uevent_work;
66 struct work_struct sync_work;
67 char name[];
68 };
69 #define to_rfkill(d) container_of(d, struct rfkill, dev)
70
71 struct rfkill_int_event {
72 struct list_head list;
73 struct rfkill_event_ext ev;
74 };
75
76 struct rfkill_data {
77 struct list_head list;
78 struct list_head events;
79 struct mutex mtx;
80 wait_queue_head_t read_wait;
81 bool input_handler;
82 u8 max_size;
83 };
84
85
86 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
87 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
88 MODULE_DESCRIPTION("RF switch support");
89 MODULE_LICENSE("GPL");
90
91
92 /*
93 * The locking here should be made much smarter, we currently have
94 * a bit of a stupid situation because drivers might want to register
95 * the rfkill struct under their own lock, and take this lock during
96 * rfkill method calls -- which will cause an AB-BA deadlock situation.
97 *
98 * To fix that, we need to rework this code here to be mostly lock-free
99 * and only use the mutex for list manipulations, not to protect the
100 * various other global variables. Then we can avoid holding the mutex
101 * around driver operations, and all is happy.
102 */
103 static LIST_HEAD(rfkill_list); /* list of registered rf switches */
104 static DEFINE_MUTEX(rfkill_global_mutex);
105 static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
106
107 static unsigned int rfkill_default_state = 1;
108 module_param_named(default_state, rfkill_default_state, uint, 0444);
109 MODULE_PARM_DESC(default_state,
110 "Default initial state for all radio types, 0 = radio off");
111
112 static struct {
113 bool cur, sav;
114 } rfkill_global_states[NUM_RFKILL_TYPES];
115
116 static bool rfkill_epo_lock_active;
117
118
119 #ifdef CONFIG_RFKILL_LEDS
120 static void rfkill_led_trigger_event(struct rfkill *rfkill)
121 {
122 struct led_trigger *trigger;
123
124 if (!rfkill->registered)
125 return;
126
127 trigger = &rfkill->led_trigger;
128
129 if (rfkill->state & RFKILL_BLOCK_ANY)
130 led_trigger_event(trigger, LED_OFF);
131 else
132 led_trigger_event(trigger, LED_FULL);
133 }
134
135 static int rfkill_led_trigger_activate(struct led_classdev *led)
136 {
137 struct rfkill *rfkill;
138
139 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
140
141 rfkill_led_trigger_event(rfkill);
142
143 return 0;
144 }
145
146 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
147 {
148 return rfkill->led_trigger.name;
149 }
150 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
151
152 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
153 {
154 BUG_ON(!rfkill);
155
156 rfkill->ledtrigname = name;
157 }
158 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
159
160 static int rfkill_led_trigger_register(struct rfkill *rfkill)
161 {
162 rfkill->led_trigger.name = rfkill->ledtrigname
163 ? : dev_name(&rfkill->dev);
164 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
165 return led_trigger_register(&rfkill->led_trigger);
166 }
167
168 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
169 {
170 led_trigger_unregister(&rfkill->led_trigger);
171 }
172
173 static struct led_trigger rfkill_any_led_trigger;
174 static struct led_trigger rfkill_none_led_trigger;
175 static struct work_struct rfkill_global_led_trigger_work;
176
177 static void rfkill_global_led_trigger_worker(struct work_struct *work)
178 {
179 enum led_brightness brightness = LED_OFF;
180 struct rfkill *rfkill;
181
182 mutex_lock(&rfkill_global_mutex);
183 list_for_each_entry(rfkill, &rfkill_list, node) {
184 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
185 brightness = LED_FULL;
186 break;
187 }
188 }
189 mutex_unlock(&rfkill_global_mutex);
190
191 led_trigger_event(&rfkill_any_led_trigger, brightness);
192 led_trigger_event(&rfkill_none_led_trigger,
193 brightness == LED_OFF ? LED_FULL : LED_OFF);
194 }
195
196 static void rfkill_global_led_trigger_event(void)
197 {
198 schedule_work(&rfkill_global_led_trigger_work);
199 }
200
201 static int rfkill_global_led_trigger_register(void)
202 {
203 int ret;
204
205 INIT_WORK(&rfkill_global_led_trigger_work,
206 rfkill_global_led_trigger_worker);
207
208 rfkill_any_led_trigger.name = "rfkill-any";
209 ret = led_trigger_register(&rfkill_any_led_trigger);
210 if (ret)
211 return ret;
212
213 rfkill_none_led_trigger.name = "rfkill-none";
214 ret = led_trigger_register(&rfkill_none_led_trigger);
215 if (ret)
216 led_trigger_unregister(&rfkill_any_led_trigger);
217 else
218 /* Delay activation until all global triggers are registered */
219 rfkill_global_led_trigger_event();
220
221 return ret;
222 }
223
224 static void rfkill_global_led_trigger_unregister(void)
225 {
226 led_trigger_unregister(&rfkill_none_led_trigger);
227 led_trigger_unregister(&rfkill_any_led_trigger);
228 cancel_work_sync(&rfkill_global_led_trigger_work);
229 }
230 #else
231 static void rfkill_led_trigger_event(struct rfkill *rfkill)
232 {
233 }
234
235 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
236 {
237 return 0;
238 }
239
240 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
241 {
242 }
243
244 static void rfkill_global_led_trigger_event(void)
245 {
246 }
247
248 static int rfkill_global_led_trigger_register(void)
249 {
250 return 0;
251 }
252
253 static void rfkill_global_led_trigger_unregister(void)
254 {
255 }
256 #endif /* CONFIG_RFKILL_LEDS */
257
258 static void rfkill_fill_event(struct rfkill_event_ext *ev,
259 struct rfkill *rfkill,
260 enum rfkill_operation op)
261 {
262 unsigned long flags;
263
264 ev->idx = rfkill->idx;
265 ev->type = rfkill->type;
266 ev->op = op;
267
268 spin_lock_irqsave(&rfkill->lock, flags);
269 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
270 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
271 RFKILL_BLOCK_SW_PREV));
272 ev->hard_block_reasons = rfkill->hard_block_reasons;
273 spin_unlock_irqrestore(&rfkill->lock, flags);
274 }
275
276 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
277 {
278 struct rfkill_data *data;
279 struct rfkill_int_event *ev;
280
281 list_for_each_entry(data, &rfkill_fds, list) {
282 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
283 if (!ev)
284 continue;
285 rfkill_fill_event(&ev->ev, rfkill, op);
286 mutex_lock(&data->mtx);
287 list_add_tail(&ev->list, &data->events);
288 mutex_unlock(&data->mtx);
289 wake_up_interruptible(&data->read_wait);
290 }
291 }
292
293 static void rfkill_event(struct rfkill *rfkill)
294 {
295 if (!rfkill->registered)
296 return;
297
298 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
299
300 /* also send event to /dev/rfkill */
301 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
302 }
303
304 /**
305 * rfkill_set_block - wrapper for set_block method
306 *
307 * @rfkill: the rfkill struct to use
308 * @blocked: the new software state
309 *
310 * Calls the set_block method (when applicable) and handles notifications
311 * etc. as well.
312 */
313 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
314 {
315 unsigned long flags;
316 bool prev, curr;
317 int err;
318
319 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
320 return;
321
322 /*
323 * Some platforms (...!) generate input events which affect the
324 * _hard_ kill state -- whenever something tries to change the
325 * current software state query the hardware state too.
326 */
327 if (rfkill->ops->query)
328 rfkill->ops->query(rfkill, rfkill->data);
329
330 spin_lock_irqsave(&rfkill->lock, flags);
331 prev = rfkill->state & RFKILL_BLOCK_SW;
332
333 if (prev)
334 rfkill->state |= RFKILL_BLOCK_SW_PREV;
335 else
336 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
337
338 if (blocked)
339 rfkill->state |= RFKILL_BLOCK_SW;
340 else
341 rfkill->state &= ~RFKILL_BLOCK_SW;
342
343 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
344 spin_unlock_irqrestore(&rfkill->lock, flags);
345
346 err = rfkill->ops->set_block(rfkill->data, blocked);
347
348 spin_lock_irqsave(&rfkill->lock, flags);
349 if (err) {
350 /*
351 * Failed -- reset status to _PREV, which may be different
352 * from what we have set _PREV to earlier in this function
353 * if rfkill_set_sw_state was invoked.
354 */
355 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
356 rfkill->state |= RFKILL_BLOCK_SW;
357 else
358 rfkill->state &= ~RFKILL_BLOCK_SW;
359 }
360 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
361 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
362 curr = rfkill->state & RFKILL_BLOCK_SW;
363 spin_unlock_irqrestore(&rfkill->lock, flags);
364
365 rfkill_led_trigger_event(rfkill);
366 rfkill_global_led_trigger_event();
367
368 if (prev != curr)
369 rfkill_event(rfkill);
370 }
371
372 static void rfkill_sync(struct rfkill *rfkill)
373 {
374 lockdep_assert_held(&rfkill_global_mutex);
375
376 if (!rfkill->need_sync)
377 return;
378
379 rfkill_set_block(rfkill, rfkill_global_states[rfkill->type].cur);
380 rfkill->need_sync = false;
381 }
382
383 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
384 {
385 int i;
386
387 if (type != RFKILL_TYPE_ALL) {
388 rfkill_global_states[type].cur = blocked;
389 return;
390 }
391
392 for (i = 0; i < NUM_RFKILL_TYPES; i++)
393 rfkill_global_states[i].cur = blocked;
394 }
395
396 #ifdef CONFIG_RFKILL_INPUT
397 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
398
399 /**
400 * __rfkill_switch_all - Toggle state of all switches of given type
401 * @type: type of interfaces to be affected
402 * @blocked: the new state
403 *
404 * This function sets the state of all switches of given type,
405 * unless a specific switch is suspended.
406 *
407 * Caller must have acquired rfkill_global_mutex.
408 */
409 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
410 {
411 struct rfkill *rfkill;
412
413 rfkill_update_global_state(type, blocked);
414 list_for_each_entry(rfkill, &rfkill_list, node) {
415 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
416 continue;
417
418 rfkill_set_block(rfkill, blocked);
419 }
420 }
421
422 /**
423 * rfkill_switch_all - Toggle state of all switches of given type
424 * @type: type of interfaces to be affected
425 * @blocked: the new state
426 *
427 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
428 * Please refer to __rfkill_switch_all() for details.
429 *
430 * Does nothing if the EPO lock is active.
431 */
432 void rfkill_switch_all(enum rfkill_type type, bool blocked)
433 {
434 if (atomic_read(&rfkill_input_disabled))
435 return;
436
437 mutex_lock(&rfkill_global_mutex);
438
439 if (!rfkill_epo_lock_active)
440 __rfkill_switch_all(type, blocked);
441
442 mutex_unlock(&rfkill_global_mutex);
443 }
444
445 /**
446 * rfkill_epo - emergency power off all transmitters
447 *
448 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
449 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
450 *
451 * The global state before the EPO is saved and can be restored later
452 * using rfkill_restore_states().
453 */
454 void rfkill_epo(void)
455 {
456 struct rfkill *rfkill;
457 int i;
458
459 if (atomic_read(&rfkill_input_disabled))
460 return;
461
462 mutex_lock(&rfkill_global_mutex);
463
464 rfkill_epo_lock_active = true;
465 list_for_each_entry(rfkill, &rfkill_list, node)
466 rfkill_set_block(rfkill, true);
467
468 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
469 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
470 rfkill_global_states[i].cur = true;
471 }
472
473 mutex_unlock(&rfkill_global_mutex);
474 }
475
476 /**
477 * rfkill_restore_states - restore global states
478 *
479 * Restore (and sync switches to) the global state from the
480 * states in rfkill_default_states. This can undo the effects of
481 * a call to rfkill_epo().
482 */
483 void rfkill_restore_states(void)
484 {
485 int i;
486
487 if (atomic_read(&rfkill_input_disabled))
488 return;
489
490 mutex_lock(&rfkill_global_mutex);
491
492 rfkill_epo_lock_active = false;
493 for (i = 0; i < NUM_RFKILL_TYPES; i++)
494 __rfkill_switch_all(i, rfkill_global_states[i].sav);
495 mutex_unlock(&rfkill_global_mutex);
496 }
497
498 /**
499 * rfkill_remove_epo_lock - unlock state changes
500 *
501 * Used by rfkill-input manually unlock state changes, when
502 * the EPO switch is deactivated.
503 */
504 void rfkill_remove_epo_lock(void)
505 {
506 if (atomic_read(&rfkill_input_disabled))
507 return;
508
509 mutex_lock(&rfkill_global_mutex);
510 rfkill_epo_lock_active = false;
511 mutex_unlock(&rfkill_global_mutex);
512 }
513
514 /**
515 * rfkill_is_epo_lock_active - returns true EPO is active
516 *
517 * Returns 0 (false) if there is NOT an active EPO condition,
518 * and 1 (true) if there is an active EPO condition, which
519 * locks all radios in one of the BLOCKED states.
520 *
521 * Can be called in atomic context.
522 */
523 bool rfkill_is_epo_lock_active(void)
524 {
525 return rfkill_epo_lock_active;
526 }
527
528 /**
529 * rfkill_get_global_sw_state - returns global state for a type
530 * @type: the type to get the global state of
531 *
532 * Returns the current global state for a given wireless
533 * device type.
534 */
535 bool rfkill_get_global_sw_state(const enum rfkill_type type)
536 {
537 return rfkill_global_states[type].cur;
538 }
539 #endif
540
541 bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
542 bool blocked, unsigned long reason)
543 {
544 unsigned long flags;
545 bool ret, prev;
546
547 BUG_ON(!rfkill);
548
549 if (WARN(reason & ~(RFKILL_HARD_BLOCK_SIGNAL |
550 RFKILL_HARD_BLOCK_NOT_OWNER),
551 "hw_state reason not supported: 0x%lx", reason))
552 return rfkill_blocked(rfkill);
553
554 spin_lock_irqsave(&rfkill->lock, flags);
555 prev = !!(rfkill->hard_block_reasons & reason);
556 if (blocked) {
557 rfkill->state |= RFKILL_BLOCK_HW;
558 rfkill->hard_block_reasons |= reason;
559 } else {
560 rfkill->hard_block_reasons &= ~reason;
561 if (!rfkill->hard_block_reasons)
562 rfkill->state &= ~RFKILL_BLOCK_HW;
563 }
564 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
565 spin_unlock_irqrestore(&rfkill->lock, flags);
566
567 rfkill_led_trigger_event(rfkill);
568 rfkill_global_led_trigger_event();
569
570 if (rfkill->registered && prev != blocked)
571 schedule_work(&rfkill->uevent_work);
572
573 return ret;
574 }
575 EXPORT_SYMBOL(rfkill_set_hw_state_reason);
576
577 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
578 {
579 u32 bit = RFKILL_BLOCK_SW;
580
581 /* if in a ops->set_block right now, use other bit */
582 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
583 bit = RFKILL_BLOCK_SW_PREV;
584
585 if (blocked)
586 rfkill->state |= bit;
587 else
588 rfkill->state &= ~bit;
589 }
590
591 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
592 {
593 unsigned long flags;
594 bool prev, hwblock;
595
596 BUG_ON(!rfkill);
597
598 spin_lock_irqsave(&rfkill->lock, flags);
599 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
600 __rfkill_set_sw_state(rfkill, blocked);
601 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
602 blocked = blocked || hwblock;
603 spin_unlock_irqrestore(&rfkill->lock, flags);
604
605 if (!rfkill->registered)
606 return blocked;
607
608 if (prev != blocked && !hwblock)
609 schedule_work(&rfkill->uevent_work);
610
611 rfkill_led_trigger_event(rfkill);
612 rfkill_global_led_trigger_event();
613
614 return blocked;
615 }
616 EXPORT_SYMBOL(rfkill_set_sw_state);
617
618 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
619 {
620 unsigned long flags;
621
622 BUG_ON(!rfkill);
623 BUG_ON(rfkill->registered);
624
625 spin_lock_irqsave(&rfkill->lock, flags);
626 __rfkill_set_sw_state(rfkill, blocked);
627 rfkill->persistent = true;
628 spin_unlock_irqrestore(&rfkill->lock, flags);
629 }
630 EXPORT_SYMBOL(rfkill_init_sw_state);
631
632 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
633 {
634 unsigned long flags;
635 bool swprev, hwprev;
636
637 BUG_ON(!rfkill);
638
639 spin_lock_irqsave(&rfkill->lock, flags);
640
641 /*
642 * No need to care about prev/setblock ... this is for uevent only
643 * and that will get triggered by rfkill_set_block anyway.
644 */
645 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
646 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
647 __rfkill_set_sw_state(rfkill, sw);
648 if (hw)
649 rfkill->state |= RFKILL_BLOCK_HW;
650 else
651 rfkill->state &= ~RFKILL_BLOCK_HW;
652
653 spin_unlock_irqrestore(&rfkill->lock, flags);
654
655 if (!rfkill->registered) {
656 rfkill->persistent = true;
657 } else {
658 if (swprev != sw || hwprev != hw)
659 schedule_work(&rfkill->uevent_work);
660
661 rfkill_led_trigger_event(rfkill);
662 rfkill_global_led_trigger_event();
663 }
664 }
665 EXPORT_SYMBOL(rfkill_set_states);
666
667 static const char * const rfkill_types[] = {
668 NULL, /* RFKILL_TYPE_ALL */
669 "wlan",
670 "bluetooth",
671 "ultrawideband",
672 "wimax",
673 "wwan",
674 "gps",
675 "fm",
676 "nfc",
677 };
678
679 enum rfkill_type rfkill_find_type(const char *name)
680 {
681 int i;
682
683 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
684
685 if (!name)
686 return RFKILL_TYPE_ALL;
687
688 for (i = 1; i < NUM_RFKILL_TYPES; i++)
689 if (!strcmp(name, rfkill_types[i]))
690 return i;
691 return RFKILL_TYPE_ALL;
692 }
693 EXPORT_SYMBOL(rfkill_find_type);
694
695 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
696 char *buf)
697 {
698 struct rfkill *rfkill = to_rfkill(dev);
699
700 return sysfs_emit(buf, "%s\n", rfkill->name);
701 }
702 static DEVICE_ATTR_RO(name);
703
704 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
705 char *buf)
706 {
707 struct rfkill *rfkill = to_rfkill(dev);
708
709 return sysfs_emit(buf, "%s\n", rfkill_types[rfkill->type]);
710 }
711 static DEVICE_ATTR_RO(type);
712
713 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
714 char *buf)
715 {
716 struct rfkill *rfkill = to_rfkill(dev);
717
718 return sysfs_emit(buf, "%d\n", rfkill->idx);
719 }
720 static DEVICE_ATTR_RO(index);
721
722 static ssize_t persistent_show(struct device *dev,
723 struct device_attribute *attr, char *buf)
724 {
725 struct rfkill *rfkill = to_rfkill(dev);
726
727 return sysfs_emit(buf, "%d\n", rfkill->persistent);
728 }
729 static DEVICE_ATTR_RO(persistent);
730
731 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
732 char *buf)
733 {
734 struct rfkill *rfkill = to_rfkill(dev);
735
736 return sysfs_emit(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0);
737 }
738 static DEVICE_ATTR_RO(hard);
739
740 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
741 char *buf)
742 {
743 struct rfkill *rfkill = to_rfkill(dev);
744
745 mutex_lock(&rfkill_global_mutex);
746 rfkill_sync(rfkill);
747 mutex_unlock(&rfkill_global_mutex);
748
749 return sysfs_emit(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0);
750 }
751
752 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
753 const char *buf, size_t count)
754 {
755 struct rfkill *rfkill = to_rfkill(dev);
756 unsigned long state;
757 int err;
758
759 if (!capable(CAP_NET_ADMIN))
760 return -EPERM;
761
762 err = kstrtoul(buf, 0, &state);
763 if (err)
764 return err;
765
766 if (state > 1 )
767 return -EINVAL;
768
769 mutex_lock(&rfkill_global_mutex);
770 rfkill_sync(rfkill);
771 rfkill_set_block(rfkill, state);
772 mutex_unlock(&rfkill_global_mutex);
773
774 return count;
775 }
776 static DEVICE_ATTR_RW(soft);
777
778 static ssize_t hard_block_reasons_show(struct device *dev,
779 struct device_attribute *attr,
780 char *buf)
781 {
782 struct rfkill *rfkill = to_rfkill(dev);
783
784 return sysfs_emit(buf, "0x%lx\n", rfkill->hard_block_reasons);
785 }
786 static DEVICE_ATTR_RO(hard_block_reasons);
787
788 static u8 user_state_from_blocked(unsigned long state)
789 {
790 if (state & RFKILL_BLOCK_HW)
791 return RFKILL_USER_STATE_HARD_BLOCKED;
792 if (state & RFKILL_BLOCK_SW)
793 return RFKILL_USER_STATE_SOFT_BLOCKED;
794
795 return RFKILL_USER_STATE_UNBLOCKED;
796 }
797
798 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
799 char *buf)
800 {
801 struct rfkill *rfkill = to_rfkill(dev);
802
803 mutex_lock(&rfkill_global_mutex);
804 rfkill_sync(rfkill);
805 mutex_unlock(&rfkill_global_mutex);
806
807 return sysfs_emit(buf, "%d\n", user_state_from_blocked(rfkill->state));
808 }
809
810 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
811 const char *buf, size_t count)
812 {
813 struct rfkill *rfkill = to_rfkill(dev);
814 unsigned long state;
815 int err;
816
817 if (!capable(CAP_NET_ADMIN))
818 return -EPERM;
819
820 err = kstrtoul(buf, 0, &state);
821 if (err)
822 return err;
823
824 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
825 state != RFKILL_USER_STATE_UNBLOCKED)
826 return -EINVAL;
827
828 mutex_lock(&rfkill_global_mutex);
829 rfkill_sync(rfkill);
830 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
831 mutex_unlock(&rfkill_global_mutex);
832
833 return count;
834 }
835 static DEVICE_ATTR_RW(state);
836
837 static struct attribute *rfkill_dev_attrs[] = {
838 &dev_attr_name.attr,
839 &dev_attr_type.attr,
840 &dev_attr_index.attr,
841 &dev_attr_persistent.attr,
842 &dev_attr_state.attr,
843 &dev_attr_soft.attr,
844 &dev_attr_hard.attr,
845 &dev_attr_hard_block_reasons.attr,
846 NULL,
847 };
848 ATTRIBUTE_GROUPS(rfkill_dev);
849
850 static void rfkill_release(struct device *dev)
851 {
852 struct rfkill *rfkill = to_rfkill(dev);
853
854 kfree(rfkill);
855 }
856
857 static int rfkill_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
858 {
859 struct rfkill *rfkill = to_rfkill(dev);
860 unsigned long flags;
861 unsigned long reasons;
862 u32 state;
863 int error;
864
865 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
866 if (error)
867 return error;
868 error = add_uevent_var(env, "RFKILL_TYPE=%s",
869 rfkill_types[rfkill->type]);
870 if (error)
871 return error;
872 spin_lock_irqsave(&rfkill->lock, flags);
873 state = rfkill->state;
874 reasons = rfkill->hard_block_reasons;
875 spin_unlock_irqrestore(&rfkill->lock, flags);
876 error = add_uevent_var(env, "RFKILL_STATE=%d",
877 user_state_from_blocked(state));
878 if (error)
879 return error;
880 return add_uevent_var(env, "RFKILL_HW_BLOCK_REASON=0x%lx", reasons);
881 }
882
883 void rfkill_pause_polling(struct rfkill *rfkill)
884 {
885 BUG_ON(!rfkill);
886
887 if (!rfkill->ops->poll)
888 return;
889
890 rfkill->polling_paused = true;
891 cancel_delayed_work_sync(&rfkill->poll_work);
892 }
893 EXPORT_SYMBOL(rfkill_pause_polling);
894
895 void rfkill_resume_polling(struct rfkill *rfkill)
896 {
897 BUG_ON(!rfkill);
898
899 if (!rfkill->ops->poll)
900 return;
901
902 rfkill->polling_paused = false;
903
904 if (rfkill->suspended)
905 return;
906
907 queue_delayed_work(system_power_efficient_wq,
908 &rfkill->poll_work, 0);
909 }
910 EXPORT_SYMBOL(rfkill_resume_polling);
911
912 #ifdef CONFIG_PM_SLEEP
913 static int rfkill_suspend(struct device *dev)
914 {
915 struct rfkill *rfkill = to_rfkill(dev);
916
917 rfkill->suspended = true;
918 cancel_delayed_work_sync(&rfkill->poll_work);
919
920 return 0;
921 }
922
923 static int rfkill_resume(struct device *dev)
924 {
925 struct rfkill *rfkill = to_rfkill(dev);
926 bool cur;
927
928 rfkill->suspended = false;
929
930 if (!rfkill->registered)
931 return 0;
932
933 if (!rfkill->persistent) {
934 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
935 rfkill_set_block(rfkill, cur);
936 }
937
938 if (rfkill->ops->poll && !rfkill->polling_paused)
939 queue_delayed_work(system_power_efficient_wq,
940 &rfkill->poll_work, 0);
941
942 return 0;
943 }
944
945 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
946 #define RFKILL_PM_OPS (&rfkill_pm_ops)
947 #else
948 #define RFKILL_PM_OPS NULL
949 #endif
950
951 static struct class rfkill_class = {
952 .name = "rfkill",
953 .dev_release = rfkill_release,
954 .dev_groups = rfkill_dev_groups,
955 .dev_uevent = rfkill_dev_uevent,
956 .pm = RFKILL_PM_OPS,
957 };
958
959 bool rfkill_blocked(struct rfkill *rfkill)
960 {
961 unsigned long flags;
962 u32 state;
963
964 spin_lock_irqsave(&rfkill->lock, flags);
965 state = rfkill->state;
966 spin_unlock_irqrestore(&rfkill->lock, flags);
967
968 return !!(state & RFKILL_BLOCK_ANY);
969 }
970 EXPORT_SYMBOL(rfkill_blocked);
971
972 bool rfkill_soft_blocked(struct rfkill *rfkill)
973 {
974 unsigned long flags;
975 u32 state;
976
977 spin_lock_irqsave(&rfkill->lock, flags);
978 state = rfkill->state;
979 spin_unlock_irqrestore(&rfkill->lock, flags);
980
981 return !!(state & RFKILL_BLOCK_SW);
982 }
983 EXPORT_SYMBOL(rfkill_soft_blocked);
984
985 struct rfkill * __must_check rfkill_alloc(const char *name,
986 struct device *parent,
987 const enum rfkill_type type,
988 const struct rfkill_ops *ops,
989 void *ops_data)
990 {
991 struct rfkill *rfkill;
992 struct device *dev;
993
994 if (WARN_ON(!ops))
995 return NULL;
996
997 if (WARN_ON(!ops->set_block))
998 return NULL;
999
1000 if (WARN_ON(!name))
1001 return NULL;
1002
1003 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
1004 return NULL;
1005
1006 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
1007 if (!rfkill)
1008 return NULL;
1009
1010 spin_lock_init(&rfkill->lock);
1011 INIT_LIST_HEAD(&rfkill->node);
1012 rfkill->type = type;
1013 strcpy(rfkill->name, name);
1014 rfkill->ops = ops;
1015 rfkill->data = ops_data;
1016
1017 dev = &rfkill->dev;
1018 dev->class = &rfkill_class;
1019 dev->parent = parent;
1020 device_initialize(dev);
1021
1022 return rfkill;
1023 }
1024 EXPORT_SYMBOL(rfkill_alloc);
1025
1026 static void rfkill_poll(struct work_struct *work)
1027 {
1028 struct rfkill *rfkill;
1029
1030 rfkill = container_of(work, struct rfkill, poll_work.work);
1031
1032 /*
1033 * Poll hardware state -- driver will use one of the
1034 * rfkill_set{,_hw,_sw}_state functions and use its
1035 * return value to update the current status.
1036 */
1037 rfkill->ops->poll(rfkill, rfkill->data);
1038
1039 queue_delayed_work(system_power_efficient_wq,
1040 &rfkill->poll_work,
1041 round_jiffies_relative(POLL_INTERVAL));
1042 }
1043
1044 static void rfkill_uevent_work(struct work_struct *work)
1045 {
1046 struct rfkill *rfkill;
1047
1048 rfkill = container_of(work, struct rfkill, uevent_work);
1049
1050 mutex_lock(&rfkill_global_mutex);
1051 rfkill_event(rfkill);
1052 mutex_unlock(&rfkill_global_mutex);
1053 }
1054
1055 static void rfkill_sync_work(struct work_struct *work)
1056 {
1057 struct rfkill *rfkill = container_of(work, struct rfkill, sync_work);
1058
1059 mutex_lock(&rfkill_global_mutex);
1060 rfkill_sync(rfkill);
1061 mutex_unlock(&rfkill_global_mutex);
1062 }
1063
1064 int __must_check rfkill_register(struct rfkill *rfkill)
1065 {
1066 static unsigned long rfkill_no;
1067 struct device *dev;
1068 int error;
1069
1070 if (!rfkill)
1071 return -EINVAL;
1072
1073 dev = &rfkill->dev;
1074
1075 mutex_lock(&rfkill_global_mutex);
1076
1077 if (rfkill->registered) {
1078 error = -EALREADY;
1079 goto unlock;
1080 }
1081
1082 rfkill->idx = rfkill_no;
1083 dev_set_name(dev, "rfkill%lu", rfkill_no);
1084 rfkill_no++;
1085
1086 list_add_tail(&rfkill->node, &rfkill_list);
1087
1088 error = device_add(dev);
1089 if (error)
1090 goto remove;
1091
1092 error = rfkill_led_trigger_register(rfkill);
1093 if (error)
1094 goto devdel;
1095
1096 rfkill->registered = true;
1097
1098 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1099 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1100 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1101
1102 if (rfkill->ops->poll)
1103 queue_delayed_work(system_power_efficient_wq,
1104 &rfkill->poll_work,
1105 round_jiffies_relative(POLL_INTERVAL));
1106
1107 if (!rfkill->persistent || rfkill_epo_lock_active) {
1108 rfkill->need_sync = true;
1109 schedule_work(&rfkill->sync_work);
1110 } else {
1111 #ifdef CONFIG_RFKILL_INPUT
1112 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1113
1114 if (!atomic_read(&rfkill_input_disabled))
1115 __rfkill_switch_all(rfkill->type, soft_blocked);
1116 #endif
1117 }
1118
1119 rfkill_global_led_trigger_event();
1120 rfkill_send_events(rfkill, RFKILL_OP_ADD);
1121
1122 mutex_unlock(&rfkill_global_mutex);
1123 return 0;
1124
1125 devdel:
1126 device_del(&rfkill->dev);
1127 remove:
1128 list_del_init(&rfkill->node);
1129 unlock:
1130 mutex_unlock(&rfkill_global_mutex);
1131 return error;
1132 }
1133 EXPORT_SYMBOL(rfkill_register);
1134
1135 void rfkill_unregister(struct rfkill *rfkill)
1136 {
1137 BUG_ON(!rfkill);
1138
1139 if (rfkill->ops->poll)
1140 cancel_delayed_work_sync(&rfkill->poll_work);
1141
1142 cancel_work_sync(&rfkill->uevent_work);
1143 cancel_work_sync(&rfkill->sync_work);
1144
1145 rfkill->registered = false;
1146
1147 device_del(&rfkill->dev);
1148
1149 mutex_lock(&rfkill_global_mutex);
1150 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1151 list_del_init(&rfkill->node);
1152 rfkill_global_led_trigger_event();
1153 mutex_unlock(&rfkill_global_mutex);
1154
1155 rfkill_led_trigger_unregister(rfkill);
1156 }
1157 EXPORT_SYMBOL(rfkill_unregister);
1158
1159 void rfkill_destroy(struct rfkill *rfkill)
1160 {
1161 if (rfkill)
1162 put_device(&rfkill->dev);
1163 }
1164 EXPORT_SYMBOL(rfkill_destroy);
1165
1166 static int rfkill_fop_open(struct inode *inode, struct file *file)
1167 {
1168 struct rfkill_data *data;
1169 struct rfkill *rfkill;
1170 struct rfkill_int_event *ev, *tmp;
1171
1172 data = kzalloc(sizeof(*data), GFP_KERNEL);
1173 if (!data)
1174 return -ENOMEM;
1175
1176 data->max_size = RFKILL_EVENT_SIZE_V1;
1177
1178 INIT_LIST_HEAD(&data->events);
1179 mutex_init(&data->mtx);
1180 init_waitqueue_head(&data->read_wait);
1181
1182 mutex_lock(&rfkill_global_mutex);
1183 /*
1184 * start getting events from elsewhere but hold mtx to get
1185 * startup events added first
1186 */
1187
1188 list_for_each_entry(rfkill, &rfkill_list, node) {
1189 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1190 if (!ev)
1191 goto free;
1192 rfkill_sync(rfkill);
1193 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1194 mutex_lock(&data->mtx);
1195 list_add_tail(&ev->list, &data->events);
1196 mutex_unlock(&data->mtx);
1197 }
1198 list_add(&data->list, &rfkill_fds);
1199 mutex_unlock(&rfkill_global_mutex);
1200
1201 file->private_data = data;
1202
1203 return stream_open(inode, file);
1204
1205 free:
1206 mutex_unlock(&rfkill_global_mutex);
1207 mutex_destroy(&data->mtx);
1208 list_for_each_entry_safe(ev, tmp, &data->events, list)
1209 kfree(ev);
1210 kfree(data);
1211 return -ENOMEM;
1212 }
1213
1214 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1215 {
1216 struct rfkill_data *data = file->private_data;
1217 __poll_t res = EPOLLOUT | EPOLLWRNORM;
1218
1219 poll_wait(file, &data->read_wait, wait);
1220
1221 mutex_lock(&data->mtx);
1222 if (!list_empty(&data->events))
1223 res = EPOLLIN | EPOLLRDNORM;
1224 mutex_unlock(&data->mtx);
1225
1226 return res;
1227 }
1228
1229 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1230 size_t count, loff_t *pos)
1231 {
1232 struct rfkill_data *data = file->private_data;
1233 struct rfkill_int_event *ev;
1234 unsigned long sz;
1235 int ret;
1236
1237 mutex_lock(&data->mtx);
1238
1239 while (list_empty(&data->events)) {
1240 if (file->f_flags & O_NONBLOCK) {
1241 ret = -EAGAIN;
1242 goto out;
1243 }
1244 mutex_unlock(&data->mtx);
1245 /* since we re-check and it just compares pointers,
1246 * using !list_empty() without locking isn't a problem
1247 */
1248 ret = wait_event_interruptible(data->read_wait,
1249 !list_empty(&data->events));
1250 mutex_lock(&data->mtx);
1251
1252 if (ret)
1253 goto out;
1254 }
1255
1256 ev = list_first_entry(&data->events, struct rfkill_int_event,
1257 list);
1258
1259 sz = min_t(unsigned long, sizeof(ev->ev), count);
1260 sz = min_t(unsigned long, sz, data->max_size);
1261 ret = sz;
1262 if (copy_to_user(buf, &ev->ev, sz))
1263 ret = -EFAULT;
1264
1265 list_del(&ev->list);
1266 kfree(ev);
1267 out:
1268 mutex_unlock(&data->mtx);
1269 return ret;
1270 }
1271
1272 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1273 size_t count, loff_t *pos)
1274 {
1275 struct rfkill_data *data = file->private_data;
1276 struct rfkill *rfkill;
1277 struct rfkill_event_ext ev;
1278 int ret;
1279
1280 /* we don't need the 'hard' variable but accept it */
1281 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1282 return -EINVAL;
1283
1284 /*
1285 * Copy as much data as we can accept into our 'ev' buffer,
1286 * but tell userspace how much we've copied so it can determine
1287 * our API version even in a write() call, if it cares.
1288 */
1289 count = min(count, sizeof(ev));
1290 count = min_t(size_t, count, data->max_size);
1291 if (copy_from_user(&ev, buf, count))
1292 return -EFAULT;
1293
1294 if (ev.type >= NUM_RFKILL_TYPES)
1295 return -EINVAL;
1296
1297 mutex_lock(&rfkill_global_mutex);
1298
1299 switch (ev.op) {
1300 case RFKILL_OP_CHANGE_ALL:
1301 rfkill_update_global_state(ev.type, ev.soft);
1302 list_for_each_entry(rfkill, &rfkill_list, node)
1303 if (rfkill->type == ev.type ||
1304 ev.type == RFKILL_TYPE_ALL)
1305 rfkill_set_block(rfkill, ev.soft);
1306 ret = 0;
1307 break;
1308 case RFKILL_OP_CHANGE:
1309 list_for_each_entry(rfkill, &rfkill_list, node)
1310 if (rfkill->idx == ev.idx &&
1311 (rfkill->type == ev.type ||
1312 ev.type == RFKILL_TYPE_ALL))
1313 rfkill_set_block(rfkill, ev.soft);
1314 ret = 0;
1315 break;
1316 default:
1317 ret = -EINVAL;
1318 break;
1319 }
1320
1321 mutex_unlock(&rfkill_global_mutex);
1322
1323 return ret ?: count;
1324 }
1325
1326 static int rfkill_fop_release(struct inode *inode, struct file *file)
1327 {
1328 struct rfkill_data *data = file->private_data;
1329 struct rfkill_int_event *ev, *tmp;
1330
1331 mutex_lock(&rfkill_global_mutex);
1332 list_del(&data->list);
1333 mutex_unlock(&rfkill_global_mutex);
1334
1335 mutex_destroy(&data->mtx);
1336 list_for_each_entry_safe(ev, tmp, &data->events, list)
1337 kfree(ev);
1338
1339 #ifdef CONFIG_RFKILL_INPUT
1340 if (data->input_handler)
1341 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1342 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1343 #endif
1344
1345 kfree(data);
1346
1347 return 0;
1348 }
1349
1350 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1351 unsigned long arg)
1352 {
1353 struct rfkill_data *data = file->private_data;
1354 int ret = -ENOTTY;
1355 u32 size;
1356
1357 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1358 return -ENOTTY;
1359
1360 mutex_lock(&data->mtx);
1361 switch (_IOC_NR(cmd)) {
1362 #ifdef CONFIG_RFKILL_INPUT
1363 case RFKILL_IOC_NOINPUT:
1364 if (!data->input_handler) {
1365 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1366 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1367 data->input_handler = true;
1368 }
1369 ret = 0;
1370 break;
1371 #endif
1372 case RFKILL_IOC_MAX_SIZE:
1373 if (get_user(size, (__u32 __user *)arg)) {
1374 ret = -EFAULT;
1375 break;
1376 }
1377 if (size < RFKILL_EVENT_SIZE_V1 || size > U8_MAX) {
1378 ret = -EINVAL;
1379 break;
1380 }
1381 data->max_size = size;
1382 ret = 0;
1383 break;
1384 default:
1385 break;
1386 }
1387 mutex_unlock(&data->mtx);
1388
1389 return ret;
1390 }
1391
1392 static const struct file_operations rfkill_fops = {
1393 .owner = THIS_MODULE,
1394 .open = rfkill_fop_open,
1395 .read = rfkill_fop_read,
1396 .write = rfkill_fop_write,
1397 .poll = rfkill_fop_poll,
1398 .release = rfkill_fop_release,
1399 .unlocked_ioctl = rfkill_fop_ioctl,
1400 .compat_ioctl = compat_ptr_ioctl,
1401 .llseek = no_llseek,
1402 };
1403
1404 #define RFKILL_NAME "rfkill"
1405
1406 static struct miscdevice rfkill_miscdev = {
1407 .fops = &rfkill_fops,
1408 .name = RFKILL_NAME,
1409 .minor = RFKILL_MINOR,
1410 };
1411
1412 static int __init rfkill_init(void)
1413 {
1414 int error;
1415
1416 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1417
1418 error = class_register(&rfkill_class);
1419 if (error)
1420 goto error_class;
1421
1422 error = misc_register(&rfkill_miscdev);
1423 if (error)
1424 goto error_misc;
1425
1426 error = rfkill_global_led_trigger_register();
1427 if (error)
1428 goto error_led_trigger;
1429
1430 #ifdef CONFIG_RFKILL_INPUT
1431 error = rfkill_handler_init();
1432 if (error)
1433 goto error_input;
1434 #endif
1435
1436 return 0;
1437
1438 #ifdef CONFIG_RFKILL_INPUT
1439 error_input:
1440 rfkill_global_led_trigger_unregister();
1441 #endif
1442 error_led_trigger:
1443 misc_deregister(&rfkill_miscdev);
1444 error_misc:
1445 class_unregister(&rfkill_class);
1446 error_class:
1447 return error;
1448 }
1449 subsys_initcall(rfkill_init);
1450
1451 static void __exit rfkill_exit(void)
1452 {
1453 #ifdef CONFIG_RFKILL_INPUT
1454 rfkill_handler_exit();
1455 #endif
1456 rfkill_global_led_trigger_unregister();
1457 misc_deregister(&rfkill_miscdev);
1458 class_unregister(&rfkill_class);
1459 }
1460 module_exit(rfkill_exit);
1461
1462 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1463 MODULE_ALIAS("devname:" RFKILL_NAME);
1464
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