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