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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 <[email protected]>
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
76/* Max rfkill events that can be "in-flight" for one data source */
77#define MAX_RFKILL_EVENT 1000
78struct rfkill_data {
79 struct list_head list;
80 struct list_head events;
81 struct mutex mtx;
82 wait_queue_head_t read_wait;
83 u32 event_count;
84 bool input_handler;
85 u8 max_size;
86};
87
88
89MODULE_AUTHOR("Ivo van Doorn <[email protected]>");
90MODULE_AUTHOR("Johannes Berg <[email protected]>");
91MODULE_DESCRIPTION("RF switch support");
92MODULE_LICENSE("GPL");
93
94
95/*
96 * The locking here should be made much smarter, we currently have
97 * a bit of a stupid situation because drivers might want to register
98 * the rfkill struct under their own lock, and take this lock during
99 * rfkill method calls -- which will cause an AB-BA deadlock situation.
100 *
101 * To fix that, we need to rework this code here to be mostly lock-free
102 * and only use the mutex for list manipulations, not to protect the
103 * various other global variables. Then we can avoid holding the mutex
104 * around driver operations, and all is happy.
105 */
106static LIST_HEAD(rfkill_list); /* list of registered rf switches */
107static DEFINE_MUTEX(rfkill_global_mutex);
108static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
109
110static unsigned int rfkill_default_state = 1;
111module_param_named(default_state, rfkill_default_state, uint, 0444);
112MODULE_PARM_DESC(default_state,
113 "Default initial state for all radio types, 0 = radio off");
114
115static struct {
116 bool cur, sav;
117} rfkill_global_states[NUM_RFKILL_TYPES];
118
119static bool rfkill_epo_lock_active;
120
121
122#ifdef CONFIG_RFKILL_LEDS
123static void rfkill_led_trigger_event(struct rfkill *rfkill)
124{
125 struct led_trigger *trigger;
126
127 if (!rfkill->registered)
128 return;
129
130 trigger = &rfkill->led_trigger;
131
132 if (rfkill->state & RFKILL_BLOCK_ANY)
133 led_trigger_event(trigger, LED_OFF);
134 else
135 led_trigger_event(trigger, LED_FULL);
136}
137
138static int rfkill_led_trigger_activate(struct led_classdev *led)
139{
140 struct rfkill *rfkill;
141
142 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
143
144 rfkill_led_trigger_event(rfkill);
145
146 return 0;
147}
148
149const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
150{
151 return rfkill->led_trigger.name;
152}
153EXPORT_SYMBOL(rfkill_get_led_trigger_name);
154
155void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
156{
157 BUG_ON(!rfkill);
158
159 rfkill->ledtrigname = name;
160}
161EXPORT_SYMBOL(rfkill_set_led_trigger_name);
162
163static int rfkill_led_trigger_register(struct rfkill *rfkill)
164{
165 rfkill->led_trigger.name = rfkill->ledtrigname
166 ? : dev_name(&rfkill->dev);
167 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
168 return led_trigger_register(&rfkill->led_trigger);
169}
170
171static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
172{
173 led_trigger_unregister(&rfkill->led_trigger);
174}
175
176static struct led_trigger rfkill_any_led_trigger;
177static struct led_trigger rfkill_none_led_trigger;
178static struct work_struct rfkill_global_led_trigger_work;
179
180static void rfkill_global_led_trigger_worker(struct work_struct *work)
181{
182 enum led_brightness brightness = LED_OFF;
183 struct rfkill *rfkill;
184
185 mutex_lock(&rfkill_global_mutex);
186 list_for_each_entry(rfkill, &rfkill_list, node) {
187 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
188 brightness = LED_FULL;
189 break;
190 }
191 }
192 mutex_unlock(&rfkill_global_mutex);
193
194 led_trigger_event(&rfkill_any_led_trigger, brightness);
195 led_trigger_event(&rfkill_none_led_trigger,
196 brightness == LED_OFF ? LED_FULL : LED_OFF);
197}
198
199static void rfkill_global_led_trigger_event(void)
200{
201 schedule_work(&rfkill_global_led_trigger_work);
202}
203
204static int rfkill_global_led_trigger_register(void)
205{
206 int ret;
207
208 INIT_WORK(&rfkill_global_led_trigger_work,
209 rfkill_global_led_trigger_worker);
210
211 rfkill_any_led_trigger.name = "rfkill-any";
212 ret = led_trigger_register(&rfkill_any_led_trigger);
213 if (ret)
214 return ret;
215
216 rfkill_none_led_trigger.name = "rfkill-none";
217 ret = led_trigger_register(&rfkill_none_led_trigger);
218 if (ret)
219 led_trigger_unregister(&rfkill_any_led_trigger);
220 else
221 /* Delay activation until all global triggers are registered */
222 rfkill_global_led_trigger_event();
223
224 return ret;
225}
226
227static void rfkill_global_led_trigger_unregister(void)
228{
229 led_trigger_unregister(&rfkill_none_led_trigger);
230 led_trigger_unregister(&rfkill_any_led_trigger);
231 cancel_work_sync(&rfkill_global_led_trigger_work);
232}
233#else
234static void rfkill_led_trigger_event(struct rfkill *rfkill)
235{
236}
237
238static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
239{
240 return 0;
241}
242
243static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
244{
245}
246
247static void rfkill_global_led_trigger_event(void)
248{
249}
250
251static int rfkill_global_led_trigger_register(void)
252{
253 return 0;
254}
255
256static void rfkill_global_led_trigger_unregister(void)
257{
258}
259#endif /* CONFIG_RFKILL_LEDS */
260
261static int rfkill_fill_event(struct rfkill_int_event *int_ev,
262 struct rfkill *rfkill,
263 struct rfkill_data *data,
264 enum rfkill_operation op)
265{
266 struct rfkill_event_ext *ev = &int_ev->ev;
267 unsigned long flags;
268
269 ev->idx = rfkill->idx;
270 ev->type = rfkill->type;
271 ev->op = op;
272
273 spin_lock_irqsave(&rfkill->lock, flags);
274 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
275 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
276 RFKILL_BLOCK_SW_PREV));
277 ev->hard_block_reasons = rfkill->hard_block_reasons;
278 spin_unlock_irqrestore(&rfkill->lock, flags);
279
280 scoped_guard(mutex, &data->mtx) {
281 if (data->event_count++ > MAX_RFKILL_EVENT) {
282 data->event_count--;
283 return -ENOSPC;
284 }
285 list_add_tail(&int_ev->list, &data->events);
286 }
287 return 0;
288}
289
290static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
291{
292 struct rfkill_data *data;
293 struct rfkill_int_event *ev;
294
295 list_for_each_entry(data, &rfkill_fds, list) {
296 ev = kzalloc_obj(*ev);
297 if (!ev)
298 continue;
299 if (rfkill_fill_event(ev, rfkill, data, op)) {
300 kfree(ev);
301 continue;
302 }
303 wake_up_interruptible(&data->read_wait);
304 }
305}
306
307static void rfkill_event(struct rfkill *rfkill)
308{
309 if (!rfkill->registered)
310 return;
311
312 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
313
314 /* also send event to /dev/rfkill */
315 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
316}
317
318/**
319 * rfkill_set_block - wrapper for set_block method
320 *
321 * @rfkill: the rfkill struct to use
322 * @blocked: the new software state
323 *
324 * Calls the set_block method (when applicable) and handles notifications
325 * etc. as well.
326 */
327static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
328{
329 unsigned long flags;
330 bool prev, curr;
331 int err;
332
333 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
334 return;
335
336 /*
337 * Some platforms (...!) generate input events which affect the
338 * _hard_ kill state -- whenever something tries to change the
339 * current software state query the hardware state too.
340 */
341 if (rfkill->ops->query)
342 rfkill->ops->query(rfkill, rfkill->data);
343
344 spin_lock_irqsave(&rfkill->lock, flags);
345 prev = rfkill->state & RFKILL_BLOCK_SW;
346
347 if (prev)
348 rfkill->state |= RFKILL_BLOCK_SW_PREV;
349 else
350 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
351
352 if (blocked)
353 rfkill->state |= RFKILL_BLOCK_SW;
354 else
355 rfkill->state &= ~RFKILL_BLOCK_SW;
356
357 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
358 spin_unlock_irqrestore(&rfkill->lock, flags);
359
360 err = rfkill->ops->set_block(rfkill->data, blocked);
361
362 spin_lock_irqsave(&rfkill->lock, flags);
363 if (err) {
364 /*
365 * Failed -- reset status to _PREV, which may be different
366 * from what we have set _PREV to earlier in this function
367 * if rfkill_set_sw_state was invoked.
368 */
369 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
370 rfkill->state |= RFKILL_BLOCK_SW;
371 else
372 rfkill->state &= ~RFKILL_BLOCK_SW;
373 }
374 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
375 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
376 curr = rfkill->state & RFKILL_BLOCK_SW;
377 spin_unlock_irqrestore(&rfkill->lock, flags);
378
379 rfkill_led_trigger_event(rfkill);
380 rfkill_global_led_trigger_event();
381
382 if (prev != curr)
383 rfkill_event(rfkill);
384}
385
386static void rfkill_sync(struct rfkill *rfkill)
387{
388 lockdep_assert_held(&rfkill_global_mutex);
389
390 if (!rfkill->need_sync)
391 return;
392
393 rfkill_set_block(rfkill, rfkill_global_states[rfkill->type].cur);
394 rfkill->need_sync = false;
395}
396
397static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
398{
399 int i;
400
401 if (type != RFKILL_TYPE_ALL) {
402 rfkill_global_states[type].cur = blocked;
403 return;
404 }
405
406 for (i = 0; i < NUM_RFKILL_TYPES; i++)
407 rfkill_global_states[i].cur = blocked;
408}
409
410#ifdef CONFIG_RFKILL_INPUT
411static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
412
413/**
414 * __rfkill_switch_all - Toggle state of all switches of given type
415 * @type: type of interfaces to be affected
416 * @blocked: the new state
417 *
418 * This function sets the state of all switches of given type,
419 * unless a specific switch is suspended.
420 *
421 * Caller must have acquired rfkill_global_mutex.
422 */
423static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
424{
425 struct rfkill *rfkill;
426
427 rfkill_update_global_state(type, blocked);
428 list_for_each_entry(rfkill, &rfkill_list, node) {
429 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
430 continue;
431
432 rfkill_set_block(rfkill, blocked);
433 }
434}
435
436/**
437 * rfkill_switch_all - Toggle state of all switches of given type
438 * @type: type of interfaces to be affected
439 * @blocked: the new state
440 *
441 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
442 * Please refer to __rfkill_switch_all() for details.
443 *
444 * Does nothing if the EPO lock is active.
445 */
446void rfkill_switch_all(enum rfkill_type type, bool blocked)
447{
448 if (atomic_read(&rfkill_input_disabled))
449 return;
450
451 mutex_lock(&rfkill_global_mutex);
452
453 if (!rfkill_epo_lock_active)
454 __rfkill_switch_all(type, blocked);
455
456 mutex_unlock(&rfkill_global_mutex);
457}
458
459/**
460 * rfkill_epo - emergency power off all transmitters
461 *
462 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
463 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
464 *
465 * The global state before the EPO is saved and can be restored later
466 * using rfkill_restore_states().
467 */
468void rfkill_epo(void)
469{
470 struct rfkill *rfkill;
471 int i;
472
473 if (atomic_read(&rfkill_input_disabled))
474 return;
475
476 mutex_lock(&rfkill_global_mutex);
477
478 rfkill_epo_lock_active = true;
479 list_for_each_entry(rfkill, &rfkill_list, node)
480 rfkill_set_block(rfkill, true);
481
482 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
483 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
484 rfkill_global_states[i].cur = true;
485 }
486
487 mutex_unlock(&rfkill_global_mutex);
488}
489
490/**
491 * rfkill_restore_states - restore global states
492 *
493 * Restore (and sync switches to) the global state from the
494 * states in rfkill_default_states. This can undo the effects of
495 * a call to rfkill_epo().
496 */
497void rfkill_restore_states(void)
498{
499 int i;
500
501 if (atomic_read(&rfkill_input_disabled))
502 return;
503
504 mutex_lock(&rfkill_global_mutex);
505
506 rfkill_epo_lock_active = false;
507 for (i = 0; i < NUM_RFKILL_TYPES; i++)
508 __rfkill_switch_all(i, rfkill_global_states[i].sav);
509 mutex_unlock(&rfkill_global_mutex);
510}
511
512/**
513 * rfkill_remove_epo_lock - unlock state changes
514 *
515 * Used by rfkill-input manually unlock state changes, when
516 * the EPO switch is deactivated.
517 */
518void rfkill_remove_epo_lock(void)
519{
520 if (atomic_read(&rfkill_input_disabled))
521 return;
522
523 mutex_lock(&rfkill_global_mutex);
524 rfkill_epo_lock_active = false;
525 mutex_unlock(&rfkill_global_mutex);
526}
527
528/**
529 * rfkill_is_epo_lock_active - returns true EPO is active
530 *
531 * Returns 0 (false) if there is NOT an active EPO condition,
532 * and 1 (true) if there is an active EPO condition, which
533 * locks all radios in one of the BLOCKED states.
534 *
535 * Can be called in atomic context.
536 */
537bool rfkill_is_epo_lock_active(void)
538{
539 return rfkill_epo_lock_active;
540}
541
542/**
543 * rfkill_get_global_sw_state - returns global state for a type
544 * @type: the type to get the global state of
545 *
546 * Returns the current global state for a given wireless
547 * device type.
548 */
549bool rfkill_get_global_sw_state(const enum rfkill_type type)
550{
551 return rfkill_global_states[type].cur;
552}
553#endif
554
555bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
556 bool blocked,
557 enum rfkill_hard_block_reasons reason)
558{
559 unsigned long flags;
560 bool ret, prev;
561
562 BUG_ON(!rfkill);
563
564 spin_lock_irqsave(&rfkill->lock, flags);
565 prev = !!(rfkill->hard_block_reasons & reason);
566 if (blocked) {
567 rfkill->state |= RFKILL_BLOCK_HW;
568 rfkill->hard_block_reasons |= reason;
569 } else {
570 rfkill->hard_block_reasons &= ~reason;
571 if (!rfkill->hard_block_reasons)
572 rfkill->state &= ~RFKILL_BLOCK_HW;
573 }
574 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
575 spin_unlock_irqrestore(&rfkill->lock, flags);
576
577 rfkill_led_trigger_event(rfkill);
578 rfkill_global_led_trigger_event();
579
580 if (rfkill->registered && prev != blocked)
581 schedule_work(&rfkill->uevent_work);
582
583 return ret;
584}
585EXPORT_SYMBOL(rfkill_set_hw_state_reason);
586
587static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
588{
589 u32 bit = RFKILL_BLOCK_SW;
590
591 /* if in a ops->set_block right now, use other bit */
592 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
593 bit = RFKILL_BLOCK_SW_PREV;
594
595 if (blocked)
596 rfkill->state |= bit;
597 else
598 rfkill->state &= ~bit;
599}
600
601bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
602{
603 unsigned long flags;
604 bool prev, hwblock;
605
606 BUG_ON(!rfkill);
607
608 spin_lock_irqsave(&rfkill->lock, flags);
609 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
610 __rfkill_set_sw_state(rfkill, blocked);
611 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
612 blocked = blocked || hwblock;
613 spin_unlock_irqrestore(&rfkill->lock, flags);
614
615 if (!rfkill->registered)
616 return blocked;
617
618 if (prev != blocked && !hwblock)
619 schedule_work(&rfkill->uevent_work);
620
621 rfkill_led_trigger_event(rfkill);
622 rfkill_global_led_trigger_event();
623
624 return blocked;
625}
626EXPORT_SYMBOL(rfkill_set_sw_state);
627
628void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
629{
630 unsigned long flags;
631
632 BUG_ON(!rfkill);
633 BUG_ON(rfkill->registered);
634
635 spin_lock_irqsave(&rfkill->lock, flags);
636 __rfkill_set_sw_state(rfkill, blocked);
637 rfkill->persistent = true;
638 spin_unlock_irqrestore(&rfkill->lock, flags);
639}
640EXPORT_SYMBOL(rfkill_init_sw_state);
641
642void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
643{
644 unsigned long flags;
645 bool swprev, hwprev;
646
647 BUG_ON(!rfkill);
648
649 spin_lock_irqsave(&rfkill->lock, flags);
650
651 /*
652 * No need to care about prev/setblock ... this is for uevent only
653 * and that will get triggered by rfkill_set_block anyway.
654 */
655 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
656 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
657 __rfkill_set_sw_state(rfkill, sw);
658 if (hw)
659 rfkill->state |= RFKILL_BLOCK_HW;
660 else
661 rfkill->state &= ~RFKILL_BLOCK_HW;
662
663 spin_unlock_irqrestore(&rfkill->lock, flags);
664
665 if (!rfkill->registered) {
666 rfkill->persistent = true;
667 } else {
668 if (swprev != sw || hwprev != hw)
669 schedule_work(&rfkill->uevent_work);
670
671 rfkill_led_trigger_event(rfkill);
672 rfkill_global_led_trigger_event();
673 }
674}
675EXPORT_SYMBOL(rfkill_set_states);
676
677static const char * const rfkill_types[] = {
678 NULL, /* RFKILL_TYPE_ALL */
679 "wlan",
680 "bluetooth",
681 "ultrawideband",
682 "wimax",
683 "wwan",
684 "gps",
685 "fm",
686 "nfc",
687};
688
689enum rfkill_type rfkill_find_type(const char *name)
690{
691 int i;
692
693 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
694
695 if (!name)
696 return RFKILL_TYPE_ALL;
697
698 for (i = 1; i < NUM_RFKILL_TYPES; i++)
699 if (!strcmp(name, rfkill_types[i]))
700 return i;
701 return RFKILL_TYPE_ALL;
702}
703EXPORT_SYMBOL(rfkill_find_type);
704
705static ssize_t name_show(struct device *dev, struct device_attribute *attr,
706 char *buf)
707{
708 struct rfkill *rfkill = to_rfkill(dev);
709
710 return sysfs_emit(buf, "%s\n", rfkill->name);
711}
712static DEVICE_ATTR_RO(name);
713
714static ssize_t type_show(struct device *dev, struct device_attribute *attr,
715 char *buf)
716{
717 struct rfkill *rfkill = to_rfkill(dev);
718
719 return sysfs_emit(buf, "%s\n", rfkill_types[rfkill->type]);
720}
721static DEVICE_ATTR_RO(type);
722
723static ssize_t index_show(struct device *dev, struct device_attribute *attr,
724 char *buf)
725{
726 struct rfkill *rfkill = to_rfkill(dev);
727
728 return sysfs_emit(buf, "%d\n", rfkill->idx);
729}
730static DEVICE_ATTR_RO(index);
731
732static ssize_t persistent_show(struct device *dev,
733 struct device_attribute *attr, char *buf)
734{
735 struct rfkill *rfkill = to_rfkill(dev);
736
737 return sysfs_emit(buf, "%d\n", rfkill->persistent);
738}
739static DEVICE_ATTR_RO(persistent);
740
741static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
742 char *buf)
743{
744 struct rfkill *rfkill = to_rfkill(dev);
745
746 return sysfs_emit(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0);
747}
748static DEVICE_ATTR_RO(hard);
749
750static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
751 char *buf)
752{
753 struct rfkill *rfkill = to_rfkill(dev);
754
755 mutex_lock(&rfkill_global_mutex);
756 rfkill_sync(rfkill);
757 mutex_unlock(&rfkill_global_mutex);
758
759 return sysfs_emit(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0);
760}
761
762static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
763 const char *buf, size_t count)
764{
765 struct rfkill *rfkill = to_rfkill(dev);
766 unsigned long state;
767 int err;
768
769 if (!capable(CAP_NET_ADMIN))
770 return -EPERM;
771
772 err = kstrtoul(buf, 0, &state);
773 if (err)
774 return err;
775
776 if (state > 1 )
777 return -EINVAL;
778
779 mutex_lock(&rfkill_global_mutex);
780 rfkill_sync(rfkill);
781 rfkill_set_block(rfkill, state);
782 mutex_unlock(&rfkill_global_mutex);
783
784 return count;
785}
786static DEVICE_ATTR_RW(soft);
787
788static ssize_t hard_block_reasons_show(struct device *dev,
789 struct device_attribute *attr,
790 char *buf)
791{
792 struct rfkill *rfkill = to_rfkill(dev);
793
794 return sysfs_emit(buf, "0x%lx\n", rfkill->hard_block_reasons);
795}
796static DEVICE_ATTR_RO(hard_block_reasons);
797
798static u8 user_state_from_blocked(unsigned long state)
799{
800 if (state & RFKILL_BLOCK_HW)
801 return RFKILL_USER_STATE_HARD_BLOCKED;
802 if (state & RFKILL_BLOCK_SW)
803 return RFKILL_USER_STATE_SOFT_BLOCKED;
804
805 return RFKILL_USER_STATE_UNBLOCKED;
806}
807
808static ssize_t state_show(struct device *dev, struct device_attribute *attr,
809 char *buf)
810{
811 struct rfkill *rfkill = to_rfkill(dev);
812
813 mutex_lock(&rfkill_global_mutex);
814 rfkill_sync(rfkill);
815 mutex_unlock(&rfkill_global_mutex);
816
817 return sysfs_emit(buf, "%d\n", user_state_from_blocked(rfkill->state));
818}
819
820static ssize_t state_store(struct device *dev, struct device_attribute *attr,
821 const char *buf, size_t count)
822{
823 struct rfkill *rfkill = to_rfkill(dev);
824 unsigned long state;
825 int err;
826
827 if (!capable(CAP_NET_ADMIN))
828 return -EPERM;
829
830 err = kstrtoul(buf, 0, &state);
831 if (err)
832 return err;
833
834 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
835 state != RFKILL_USER_STATE_UNBLOCKED)
836 return -EINVAL;
837
838 mutex_lock(&rfkill_global_mutex);
839 rfkill_sync(rfkill);
840 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
841 mutex_unlock(&rfkill_global_mutex);
842
843 return count;
844}
845static DEVICE_ATTR_RW(state);
846
847static struct attribute *rfkill_dev_attrs[] = {
848 &dev_attr_name.attr,
849 &dev_attr_type.attr,
850 &dev_attr_index.attr,
851 &dev_attr_persistent.attr,
852 &dev_attr_state.attr,
853 &dev_attr_soft.attr,
854 &dev_attr_hard.attr,
855 &dev_attr_hard_block_reasons.attr,
856 NULL,
857};
858ATTRIBUTE_GROUPS(rfkill_dev);
859
860static void rfkill_release(struct device *dev)
861{
862 struct rfkill *rfkill = to_rfkill(dev);
863
864 kfree(rfkill);
865}
866
867static int rfkill_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
868{
869 struct rfkill *rfkill = to_rfkill(dev);
870 unsigned long flags;
871 unsigned long reasons;
872 u32 state;
873 int error;
874
875 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
876 if (error)
877 return error;
878 error = add_uevent_var(env, "RFKILL_TYPE=%s",
879 rfkill_types[rfkill->type]);
880 if (error)
881 return error;
882 spin_lock_irqsave(&rfkill->lock, flags);
883 state = rfkill->state;
884 reasons = rfkill->hard_block_reasons;
885 spin_unlock_irqrestore(&rfkill->lock, flags);
886 error = add_uevent_var(env, "RFKILL_STATE=%d",
887 user_state_from_blocked(state));
888 if (error)
889 return error;
890 return add_uevent_var(env, "RFKILL_HW_BLOCK_REASON=0x%lx", reasons);
891}
892
893void rfkill_pause_polling(struct rfkill *rfkill)
894{
895 BUG_ON(!rfkill);
896
897 if (!rfkill->ops->poll)
898 return;
899
900 rfkill->polling_paused = true;
901 cancel_delayed_work_sync(&rfkill->poll_work);
902}
903EXPORT_SYMBOL(rfkill_pause_polling);
904
905void rfkill_resume_polling(struct rfkill *rfkill)
906{
907 BUG_ON(!rfkill);
908
909 if (!rfkill->ops->poll)
910 return;
911
912 rfkill->polling_paused = false;
913
914 if (rfkill->suspended)
915 return;
916
917 queue_delayed_work(system_power_efficient_wq,
918 &rfkill->poll_work, 0);
919}
920EXPORT_SYMBOL(rfkill_resume_polling);
921
922#ifdef CONFIG_PM_SLEEP
923static int rfkill_suspend(struct device *dev)
924{
925 struct rfkill *rfkill = to_rfkill(dev);
926
927 rfkill->suspended = true;
928 cancel_delayed_work_sync(&rfkill->poll_work);
929
930 return 0;
931}
932
933static int rfkill_resume(struct device *dev)
934{
935 struct rfkill *rfkill = to_rfkill(dev);
936 bool cur;
937
938 rfkill->suspended = false;
939
940 if (!rfkill->registered)
941 return 0;
942
943 if (!rfkill->persistent) {
944 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
945 rfkill_set_block(rfkill, cur);
946 }
947
948 if (rfkill->ops->poll && !rfkill->polling_paused)
949 queue_delayed_work(system_power_efficient_wq,
950 &rfkill->poll_work, 0);
951
952 return 0;
953}
954
955static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
956#define RFKILL_PM_OPS (&rfkill_pm_ops)
957#else
958#define RFKILL_PM_OPS NULL
959#endif
960
961static struct class rfkill_class = {
962 .name = "rfkill",
963 .dev_release = rfkill_release,
964 .dev_groups = rfkill_dev_groups,
965 .dev_uevent = rfkill_dev_uevent,
966 .pm = RFKILL_PM_OPS,
967};
968
969bool rfkill_blocked(struct rfkill *rfkill)
970{
971 unsigned long flags;
972 u32 state;
973
974 spin_lock_irqsave(&rfkill->lock, flags);
975 state = rfkill->state;
976 spin_unlock_irqrestore(&rfkill->lock, flags);
977
978 return !!(state & RFKILL_BLOCK_ANY);
979}
980EXPORT_SYMBOL(rfkill_blocked);
981
982bool rfkill_soft_blocked(struct rfkill *rfkill)
983{
984 unsigned long flags;
985 u32 state;
986
987 spin_lock_irqsave(&rfkill->lock, flags);
988 state = rfkill->state;
989 spin_unlock_irqrestore(&rfkill->lock, flags);
990
991 return !!(state & RFKILL_BLOCK_SW);
992}
993EXPORT_SYMBOL(rfkill_soft_blocked);
994
995struct rfkill * __must_check rfkill_alloc(const char *name,
996 struct device *parent,
997 const enum rfkill_type type,
998 const struct rfkill_ops *ops,
999 void *ops_data)
1000{
1001 struct rfkill *rfkill;
1002 struct device *dev;
1003 size_t name_len;
1004
1005 if (WARN_ON(!ops))
1006 return NULL;
1007
1008 if (WARN_ON(!ops->set_block))
1009 return NULL;
1010
1011 if (WARN_ON(!name))
1012 return NULL;
1013
1014 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
1015 return NULL;
1016
1017 name_len = strlen(name);
1018 rfkill = kzalloc(sizeof(*rfkill) + name_len + 1, GFP_KERNEL);
1019 if (!rfkill)
1020 return NULL;
1021
1022 spin_lock_init(&rfkill->lock);
1023 INIT_LIST_HEAD(&rfkill->node);
1024 rfkill->type = type;
1025 memcpy(rfkill->name, name, name_len);
1026 rfkill->ops = ops;
1027 rfkill->data = ops_data;
1028
1029 dev = &rfkill->dev;
1030 dev->class = &rfkill_class;
1031 dev->parent = parent;
1032 device_initialize(dev);
1033
1034 return rfkill;
1035}
1036EXPORT_SYMBOL(rfkill_alloc);
1037
1038static void rfkill_poll(struct work_struct *work)
1039{
1040 struct rfkill *rfkill;
1041
1042 rfkill = container_of(work, struct rfkill, poll_work.work);
1043
1044 /*
1045 * Poll hardware state -- driver will use one of the
1046 * rfkill_set{,_hw,_sw}_state functions and use its
1047 * return value to update the current status.
1048 */
1049 rfkill->ops->poll(rfkill, rfkill->data);
1050
1051 queue_delayed_work(system_power_efficient_wq,
1052 &rfkill->poll_work,
1053 round_jiffies_relative(POLL_INTERVAL));
1054}
1055
1056static void rfkill_uevent_work(struct work_struct *work)
1057{
1058 struct rfkill *rfkill;
1059
1060 rfkill = container_of(work, struct rfkill, uevent_work);
1061
1062 mutex_lock(&rfkill_global_mutex);
1063 rfkill_event(rfkill);
1064 mutex_unlock(&rfkill_global_mutex);
1065}
1066
1067static void rfkill_sync_work(struct work_struct *work)
1068{
1069 struct rfkill *rfkill = container_of(work, struct rfkill, sync_work);
1070
1071 mutex_lock(&rfkill_global_mutex);
1072 rfkill_sync(rfkill);
1073 mutex_unlock(&rfkill_global_mutex);
1074}
1075
1076int __must_check rfkill_register(struct rfkill *rfkill)
1077{
1078 static unsigned long rfkill_no;
1079 struct device *dev;
1080 int error;
1081
1082 if (!rfkill)
1083 return -EINVAL;
1084
1085 dev = &rfkill->dev;
1086
1087 mutex_lock(&rfkill_global_mutex);
1088
1089 if (rfkill->registered) {
1090 error = -EALREADY;
1091 goto unlock;
1092 }
1093
1094 rfkill->idx = rfkill_no;
1095 dev_set_name(dev, "rfkill%lu", rfkill_no);
1096 rfkill_no++;
1097
1098 list_add_tail(&rfkill->node, &rfkill_list);
1099
1100 error = device_add(dev);
1101 if (error)
1102 goto remove;
1103
1104 error = rfkill_led_trigger_register(rfkill);
1105 if (error)
1106 goto devdel;
1107
1108 rfkill->registered = true;
1109
1110 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1111 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1112 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1113
1114 if (rfkill->ops->poll)
1115 queue_delayed_work(system_power_efficient_wq,
1116 &rfkill->poll_work,
1117 round_jiffies_relative(POLL_INTERVAL));
1118
1119 if (!rfkill->persistent || rfkill_epo_lock_active) {
1120 rfkill->need_sync = true;
1121 schedule_work(&rfkill->sync_work);
1122 } else {
1123#ifdef CONFIG_RFKILL_INPUT
1124 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1125
1126 if (!atomic_read(&rfkill_input_disabled))
1127 __rfkill_switch_all(rfkill->type, soft_blocked);
1128#endif
1129 }
1130
1131 rfkill_global_led_trigger_event();
1132 rfkill_send_events(rfkill, RFKILL_OP_ADD);
1133
1134 mutex_unlock(&rfkill_global_mutex);
1135 return 0;
1136
1137 devdel:
1138 device_del(&rfkill->dev);
1139 remove:
1140 list_del_init(&rfkill->node);
1141 unlock:
1142 mutex_unlock(&rfkill_global_mutex);
1143 return error;
1144}
1145EXPORT_SYMBOL(rfkill_register);
1146
1147void rfkill_unregister(struct rfkill *rfkill)
1148{
1149 BUG_ON(!rfkill);
1150
1151 if (rfkill->ops->poll)
1152 cancel_delayed_work_sync(&rfkill->poll_work);
1153
1154 cancel_work_sync(&rfkill->uevent_work);
1155 cancel_work_sync(&rfkill->sync_work);
1156
1157 rfkill->registered = false;
1158
1159 device_del(&rfkill->dev);
1160
1161 mutex_lock(&rfkill_global_mutex);
1162 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1163 list_del_init(&rfkill->node);
1164 rfkill_global_led_trigger_event();
1165 mutex_unlock(&rfkill_global_mutex);
1166
1167 rfkill_led_trigger_unregister(rfkill);
1168}
1169EXPORT_SYMBOL(rfkill_unregister);
1170
1171void rfkill_destroy(struct rfkill *rfkill)
1172{
1173 if (rfkill)
1174 put_device(&rfkill->dev);
1175}
1176EXPORT_SYMBOL(rfkill_destroy);
1177
1178static int rfkill_fop_open(struct inode *inode, struct file *file)
1179{
1180 struct rfkill_data *data;
1181 struct rfkill *rfkill;
1182 struct rfkill_int_event *ev, *tmp;
1183
1184 data = kzalloc_obj(*data);
1185 if (!data)
1186 return -ENOMEM;
1187
1188 data->max_size = RFKILL_EVENT_SIZE_V1;
1189
1190 INIT_LIST_HEAD(&data->events);
1191 mutex_init(&data->mtx);
1192 init_waitqueue_head(&data->read_wait);
1193
1194 mutex_lock(&rfkill_global_mutex);
1195 /*
1196 * start getting events from elsewhere but hold mtx to get
1197 * startup events added first
1198 */
1199
1200 list_for_each_entry(rfkill, &rfkill_list, node) {
1201 ev = kzalloc_obj(*ev);
1202 if (!ev)
1203 goto free;
1204 rfkill_sync(rfkill);
1205 if (rfkill_fill_event(ev, rfkill, data, RFKILL_OP_ADD))
1206 kfree(ev);
1207 }
1208 list_add(&data->list, &rfkill_fds);
1209 mutex_unlock(&rfkill_global_mutex);
1210
1211 file->private_data = data;
1212
1213 return stream_open(inode, file);
1214
1215 free:
1216 mutex_unlock(&rfkill_global_mutex);
1217 mutex_destroy(&data->mtx);
1218 list_for_each_entry_safe(ev, tmp, &data->events, list)
1219 kfree(ev);
1220 kfree(data);
1221 return -ENOMEM;
1222}
1223
1224static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1225{
1226 struct rfkill_data *data = file->private_data;
1227 __poll_t res = EPOLLOUT | EPOLLWRNORM;
1228
1229 poll_wait(file, &data->read_wait, wait);
1230
1231 mutex_lock(&data->mtx);
1232 if (!list_empty(&data->events))
1233 res = EPOLLIN | EPOLLRDNORM;
1234 mutex_unlock(&data->mtx);
1235
1236 return res;
1237}
1238
1239static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1240 size_t count, loff_t *pos)
1241{
1242 struct rfkill_data *data = file->private_data;
1243 struct rfkill_int_event *ev;
1244 unsigned long sz;
1245 int ret;
1246
1247 mutex_lock(&data->mtx);
1248
1249 while (list_empty(&data->events)) {
1250 if (file->f_flags & O_NONBLOCK) {
1251 ret = -EAGAIN;
1252 goto out;
1253 }
1254 mutex_unlock(&data->mtx);
1255 /* since we re-check and it just compares pointers,
1256 * using !list_empty() without locking isn't a problem
1257 */
1258 ret = wait_event_interruptible(data->read_wait,
1259 !list_empty(&data->events));
1260 mutex_lock(&data->mtx);
1261
1262 if (ret)
1263 goto out;
1264 }
1265
1266 ev = list_first_entry(&data->events, struct rfkill_int_event,
1267 list);
1268
1269 sz = min_t(unsigned long, sizeof(ev->ev), count);
1270 sz = min_t(unsigned long, sz, data->max_size);
1271 ret = sz;
1272 if (copy_to_user(buf, &ev->ev, sz))
1273 ret = -EFAULT;
1274
1275 list_del(&ev->list);
1276 data->event_count--;
1277 kfree(ev);
1278 out:
1279 mutex_unlock(&data->mtx);
1280 return ret;
1281}
1282
1283static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1284 size_t count, loff_t *pos)
1285{
1286 struct rfkill_data *data = file->private_data;
1287 struct rfkill *rfkill;
1288 struct rfkill_event_ext ev;
1289 int ret;
1290
1291 /* we don't need the 'hard' variable but accept it */
1292 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1293 return -EINVAL;
1294
1295 /*
1296 * Copy as much data as we can accept into our 'ev' buffer,
1297 * but tell userspace how much we've copied so it can determine
1298 * our API version even in a write() call, if it cares.
1299 */
1300 count = min(count, sizeof(ev));
1301 count = min_t(size_t, count, data->max_size);
1302 if (copy_from_user(&ev, buf, count))
1303 return -EFAULT;
1304
1305 if (ev.type >= NUM_RFKILL_TYPES)
1306 return -EINVAL;
1307
1308 mutex_lock(&rfkill_global_mutex);
1309
1310 switch (ev.op) {
1311 case RFKILL_OP_CHANGE_ALL:
1312 rfkill_update_global_state(ev.type, ev.soft);
1313 list_for_each_entry(rfkill, &rfkill_list, node)
1314 if (rfkill->type == ev.type ||
1315 ev.type == RFKILL_TYPE_ALL)
1316 rfkill_set_block(rfkill, ev.soft);
1317 ret = 0;
1318 break;
1319 case RFKILL_OP_CHANGE:
1320 list_for_each_entry(rfkill, &rfkill_list, node)
1321 if (rfkill->idx == ev.idx &&
1322 (rfkill->type == ev.type ||
1323 ev.type == RFKILL_TYPE_ALL))
1324 rfkill_set_block(rfkill, ev.soft);
1325 ret = 0;
1326 break;
1327 default:
1328 ret = -EINVAL;
1329 break;
1330 }
1331
1332 mutex_unlock(&rfkill_global_mutex);
1333
1334 return ret ?: count;
1335}
1336
1337static int rfkill_fop_release(struct inode *inode, struct file *file)
1338{
1339 struct rfkill_data *data = file->private_data;
1340 struct rfkill_int_event *ev, *tmp;
1341
1342 mutex_lock(&rfkill_global_mutex);
1343 list_del(&data->list);
1344 mutex_unlock(&rfkill_global_mutex);
1345
1346 mutex_destroy(&data->mtx);
1347 list_for_each_entry_safe(ev, tmp, &data->events, list)
1348 kfree(ev);
1349
1350#ifdef CONFIG_RFKILL_INPUT
1351 if (data->input_handler)
1352 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1353 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1354#endif
1355
1356 kfree(data);
1357
1358 return 0;
1359}
1360
1361static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1362 unsigned long arg)
1363{
1364 struct rfkill_data *data = file->private_data;
1365 int ret = -ENOTTY;
1366 u32 size;
1367
1368 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1369 return -ENOTTY;
1370
1371 mutex_lock(&data->mtx);
1372 switch (_IOC_NR(cmd)) {
1373#ifdef CONFIG_RFKILL_INPUT
1374 case RFKILL_IOC_NOINPUT:
1375 if (!data->input_handler) {
1376 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1377 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1378 data->input_handler = true;
1379 }
1380 ret = 0;
1381 break;
1382#endif
1383 case RFKILL_IOC_MAX_SIZE:
1384 if (get_user(size, (__u32 __user *)arg)) {
1385 ret = -EFAULT;
1386 break;
1387 }
1388 if (size < RFKILL_EVENT_SIZE_V1 || size > U8_MAX) {
1389 ret = -EINVAL;
1390 break;
1391 }
1392 data->max_size = size;
1393 ret = 0;
1394 break;
1395 default:
1396 break;
1397 }
1398 mutex_unlock(&data->mtx);
1399
1400 return ret;
1401}
1402
1403static const struct file_operations rfkill_fops = {
1404 .owner = THIS_MODULE,
1405 .open = rfkill_fop_open,
1406 .read = rfkill_fop_read,
1407 .write = rfkill_fop_write,
1408 .poll = rfkill_fop_poll,
1409 .release = rfkill_fop_release,
1410 .unlocked_ioctl = rfkill_fop_ioctl,
1411 .compat_ioctl = compat_ptr_ioctl,
1412};
1413
1414#define RFKILL_NAME "rfkill"
1415
1416static struct miscdevice rfkill_miscdev = {
1417 .fops = &rfkill_fops,
1418 .name = RFKILL_NAME,
1419 .minor = RFKILL_MINOR,
1420};
1421
1422static int __init rfkill_init(void)
1423{
1424 int error;
1425
1426 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1427
1428 error = class_register(&rfkill_class);
1429 if (error)
1430 goto error_class;
1431
1432 error = misc_register(&rfkill_miscdev);
1433 if (error)
1434 goto error_misc;
1435
1436 error = rfkill_global_led_trigger_register();
1437 if (error)
1438 goto error_led_trigger;
1439
1440#ifdef CONFIG_RFKILL_INPUT
1441 error = rfkill_handler_init();
1442 if (error)
1443 goto error_input;
1444#endif
1445
1446 return 0;
1447
1448#ifdef CONFIG_RFKILL_INPUT
1449error_input:
1450 rfkill_global_led_trigger_unregister();
1451#endif
1452error_led_trigger:
1453 misc_deregister(&rfkill_miscdev);
1454error_misc:
1455 class_unregister(&rfkill_class);
1456error_class:
1457 return error;
1458}
1459subsys_initcall(rfkill_init);
1460
1461static void __exit rfkill_exit(void)
1462{
1463#ifdef CONFIG_RFKILL_INPUT
1464 rfkill_handler_exit();
1465#endif
1466 rfkill_global_led_trigger_unregister();
1467 misc_deregister(&rfkill_miscdev);
1468 class_unregister(&rfkill_class);
1469}
1470module_exit(rfkill_exit);
1471
1472MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1473MODULE_ALIAS("devname:" RFKILL_NAME);