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