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