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