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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2006 - 2007 Ivo van Doorn
4 * Copyright (C) 2007 Dmitry Torokhov
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
6 */
7
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/workqueue.h>
12#include <linux/capability.h>
13#include <linux/list.h>
14#include <linux/mutex.h>
15#include <linux/rfkill.h>
16#include <linux/sched.h>
17#include <linux/spinlock.h>
18#include <linux/device.h>
19#include <linux/miscdevice.h>
20#include <linux/wait.h>
21#include <linux/poll.h>
22#include <linux/fs.h>
23#include <linux/slab.h>
24
25#include "rfkill.h"
26
27#define POLL_INTERVAL (5 * HZ)
28
29#define RFKILL_BLOCK_HW BIT(0)
30#define RFKILL_BLOCK_SW BIT(1)
31#define RFKILL_BLOCK_SW_PREV BIT(2)
32#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
33 RFKILL_BLOCK_SW |\
34 RFKILL_BLOCK_SW_PREV)
35#define RFKILL_BLOCK_SW_SETCALL BIT(31)
36
37struct rfkill {
38 spinlock_t lock;
39
40 enum rfkill_type type;
41
42 unsigned long state;
43
44 u32 idx;
45
46 bool registered;
47 bool persistent;
48 bool polling_paused;
49 bool suspended;
50
51 const struct rfkill_ops *ops;
52 void *data;
53
54#ifdef CONFIG_RFKILL_LEDS
55 struct led_trigger led_trigger;
56 const char *ledtrigname;
57#endif
58
59 struct device dev;
60 struct list_head node;
61
62 struct delayed_work poll_work;
63 struct work_struct uevent_work;
64 struct work_struct sync_work;
65 char name[];
66};
67#define to_rfkill(d) container_of(d, struct rfkill, dev)
68
69struct rfkill_int_event {
70 struct list_head list;
71 struct rfkill_event ev;
72};
73
74struct rfkill_data {
75 struct list_head list;
76 struct list_head events;
77 struct mutex mtx;
78 wait_queue_head_t read_wait;
79 bool input_handler;
80};
81
82
83MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
84MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
85MODULE_DESCRIPTION("RF switch support");
86MODULE_LICENSE("GPL");
87
88
89/*
90 * The locking here should be made much smarter, we currently have
91 * a bit of a stupid situation because drivers might want to register
92 * the rfkill struct under their own lock, and take this lock during
93 * rfkill method calls -- which will cause an AB-BA deadlock situation.
94 *
95 * To fix that, we need to rework this code here to be mostly lock-free
96 * and only use the mutex for list manipulations, not to protect the
97 * various other global variables. Then we can avoid holding the mutex
98 * around driver operations, and all is happy.
99 */
100static LIST_HEAD(rfkill_list); /* list of registered rf switches */
101static DEFINE_MUTEX(rfkill_global_mutex);
102static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
103
104static unsigned int rfkill_default_state = 1;
105module_param_named(default_state, rfkill_default_state, uint, 0444);
106MODULE_PARM_DESC(default_state,
107 "Default initial state for all radio types, 0 = radio off");
108
109static struct {
110 bool cur, sav;
111} rfkill_global_states[NUM_RFKILL_TYPES];
112
113static bool rfkill_epo_lock_active;
114
115
116#ifdef CONFIG_RFKILL_LEDS
117static void rfkill_led_trigger_event(struct rfkill *rfkill)
118{
119 struct led_trigger *trigger;
120
121 if (!rfkill->registered)
122 return;
123
124 trigger = &rfkill->led_trigger;
125
126 if (rfkill->state & RFKILL_BLOCK_ANY)
127 led_trigger_event(trigger, LED_OFF);
128 else
129 led_trigger_event(trigger, LED_FULL);
130}
131
132static int rfkill_led_trigger_activate(struct led_classdev *led)
133{
134 struct rfkill *rfkill;
135
136 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
137
138 rfkill_led_trigger_event(rfkill);
139
140 return 0;
141}
142
143const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
144{
145 return rfkill->led_trigger.name;
146}
147EXPORT_SYMBOL(rfkill_get_led_trigger_name);
148
149void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
150{
151 BUG_ON(!rfkill);
152
153 rfkill->ledtrigname = name;
154}
155EXPORT_SYMBOL(rfkill_set_led_trigger_name);
156
157static int rfkill_led_trigger_register(struct rfkill *rfkill)
158{
159 rfkill->led_trigger.name = rfkill->ledtrigname
160 ? : dev_name(&rfkill->dev);
161 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
162 return led_trigger_register(&rfkill->led_trigger);
163}
164
165static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
166{
167 led_trigger_unregister(&rfkill->led_trigger);
168}
169
170static struct led_trigger rfkill_any_led_trigger;
171static struct led_trigger rfkill_none_led_trigger;
172static struct work_struct rfkill_global_led_trigger_work;
173
174static void rfkill_global_led_trigger_worker(struct work_struct *work)
175{
176 enum led_brightness brightness = LED_OFF;
177 struct rfkill *rfkill;
178
179 mutex_lock(&rfkill_global_mutex);
180 list_for_each_entry(rfkill, &rfkill_list, node) {
181 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
182 brightness = LED_FULL;
183 break;
184 }
185 }
186 mutex_unlock(&rfkill_global_mutex);
187
188 led_trigger_event(&rfkill_any_led_trigger, brightness);
189 led_trigger_event(&rfkill_none_led_trigger,
190 brightness == LED_OFF ? LED_FULL : LED_OFF);
191}
192
193static void rfkill_global_led_trigger_event(void)
194{
195 schedule_work(&rfkill_global_led_trigger_work);
196}
197
198static int rfkill_global_led_trigger_register(void)
199{
200 int ret;
201
202 INIT_WORK(&rfkill_global_led_trigger_work,
203 rfkill_global_led_trigger_worker);
204
205 rfkill_any_led_trigger.name = "rfkill-any";
206 ret = led_trigger_register(&rfkill_any_led_trigger);
207 if (ret)
208 return ret;
209
210 rfkill_none_led_trigger.name = "rfkill-none";
211 ret = led_trigger_register(&rfkill_none_led_trigger);
212 if (ret)
213 led_trigger_unregister(&rfkill_any_led_trigger);
214 else
215 /* Delay activation until all global triggers are registered */
216 rfkill_global_led_trigger_event();
217
218 return ret;
219}
220
221static void rfkill_global_led_trigger_unregister(void)
222{
223 led_trigger_unregister(&rfkill_none_led_trigger);
224 led_trigger_unregister(&rfkill_any_led_trigger);
225 cancel_work_sync(&rfkill_global_led_trigger_work);
226}
227#else
228static void rfkill_led_trigger_event(struct rfkill *rfkill)
229{
230}
231
232static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
233{
234 return 0;
235}
236
237static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
238{
239}
240
241static void rfkill_global_led_trigger_event(void)
242{
243}
244
245static int rfkill_global_led_trigger_register(void)
246{
247 return 0;
248}
249
250static void rfkill_global_led_trigger_unregister(void)
251{
252}
253#endif /* CONFIG_RFKILL_LEDS */
254
255static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
256 enum rfkill_operation op)
257{
258 unsigned long flags;
259
260 ev->idx = rfkill->idx;
261 ev->type = rfkill->type;
262 ev->op = op;
263
264 spin_lock_irqsave(&rfkill->lock, flags);
265 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
266 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
267 RFKILL_BLOCK_SW_PREV));
268 spin_unlock_irqrestore(&rfkill->lock, flags);
269}
270
271static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
272{
273 struct rfkill_data *data;
274 struct rfkill_int_event *ev;
275
276 list_for_each_entry(data, &rfkill_fds, list) {
277 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
278 if (!ev)
279 continue;
280 rfkill_fill_event(&ev->ev, rfkill, op);
281 mutex_lock(&data->mtx);
282 list_add_tail(&ev->list, &data->events);
283 mutex_unlock(&data->mtx);
284 wake_up_interruptible(&data->read_wait);
285 }
286}
287
288static void rfkill_event(struct rfkill *rfkill)
289{
290 if (!rfkill->registered)
291 return;
292
293 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
294
295 /* also send event to /dev/rfkill */
296 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
297}
298
299/**
300 * rfkill_set_block - wrapper for set_block method
301 *
302 * @rfkill: the rfkill struct to use
303 * @blocked: the new software state
304 *
305 * Calls the set_block method (when applicable) and handles notifications
306 * etc. as well.
307 */
308static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
309{
310 unsigned long flags;
311 bool prev, curr;
312 int err;
313
314 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
315 return;
316
317 /*
318 * Some platforms (...!) generate input events which affect the
319 * _hard_ kill state -- whenever something tries to change the
320 * current software state query the hardware state too.
321 */
322 if (rfkill->ops->query)
323 rfkill->ops->query(rfkill, rfkill->data);
324
325 spin_lock_irqsave(&rfkill->lock, flags);
326 prev = rfkill->state & RFKILL_BLOCK_SW;
327
328 if (prev)
329 rfkill->state |= RFKILL_BLOCK_SW_PREV;
330 else
331 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
332
333 if (blocked)
334 rfkill->state |= RFKILL_BLOCK_SW;
335 else
336 rfkill->state &= ~RFKILL_BLOCK_SW;
337
338 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
339 spin_unlock_irqrestore(&rfkill->lock, flags);
340
341 err = rfkill->ops->set_block(rfkill->data, blocked);
342
343 spin_lock_irqsave(&rfkill->lock, flags);
344 if (err) {
345 /*
346 * Failed -- reset status to _PREV, which may be different
347 * from what we have set _PREV to earlier in this function
348 * if rfkill_set_sw_state was invoked.
349 */
350 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
351 rfkill->state |= RFKILL_BLOCK_SW;
352 else
353 rfkill->state &= ~RFKILL_BLOCK_SW;
354 }
355 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
356 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
357 curr = rfkill->state & RFKILL_BLOCK_SW;
358 spin_unlock_irqrestore(&rfkill->lock, flags);
359
360 rfkill_led_trigger_event(rfkill);
361 rfkill_global_led_trigger_event();
362
363 if (prev != curr)
364 rfkill_event(rfkill);
365}
366
367static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
368{
369 int i;
370
371 if (type != RFKILL_TYPE_ALL) {
372 rfkill_global_states[type].cur = blocked;
373 return;
374 }
375
376 for (i = 0; i < NUM_RFKILL_TYPES; i++)
377 rfkill_global_states[i].cur = blocked;
378}
379
380#ifdef CONFIG_RFKILL_INPUT
381static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
382
383/**
384 * __rfkill_switch_all - Toggle state of all switches of given type
385 * @type: type of interfaces to be affected
386 * @blocked: the new state
387 *
388 * This function sets the state of all switches of given type,
389 * unless a specific switch is suspended.
390 *
391 * Caller must have acquired rfkill_global_mutex.
392 */
393static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
394{
395 struct rfkill *rfkill;
396
397 rfkill_update_global_state(type, blocked);
398 list_for_each_entry(rfkill, &rfkill_list, node) {
399 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
400 continue;
401
402 rfkill_set_block(rfkill, blocked);
403 }
404}
405
406/**
407 * rfkill_switch_all - Toggle state of all switches of given type
408 * @type: type of interfaces to be affected
409 * @blocked: the new state
410 *
411 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
412 * Please refer to __rfkill_switch_all() for details.
413 *
414 * Does nothing if the EPO lock is active.
415 */
416void rfkill_switch_all(enum rfkill_type type, bool blocked)
417{
418 if (atomic_read(&rfkill_input_disabled))
419 return;
420
421 mutex_lock(&rfkill_global_mutex);
422
423 if (!rfkill_epo_lock_active)
424 __rfkill_switch_all(type, blocked);
425
426 mutex_unlock(&rfkill_global_mutex);
427}
428
429/**
430 * rfkill_epo - emergency power off all transmitters
431 *
432 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
433 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
434 *
435 * The global state before the EPO is saved and can be restored later
436 * using rfkill_restore_states().
437 */
438void rfkill_epo(void)
439{
440 struct rfkill *rfkill;
441 int i;
442
443 if (atomic_read(&rfkill_input_disabled))
444 return;
445
446 mutex_lock(&rfkill_global_mutex);
447
448 rfkill_epo_lock_active = true;
449 list_for_each_entry(rfkill, &rfkill_list, node)
450 rfkill_set_block(rfkill, true);
451
452 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
453 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
454 rfkill_global_states[i].cur = true;
455 }
456
457 mutex_unlock(&rfkill_global_mutex);
458}
459
460/**
461 * rfkill_restore_states - restore global states
462 *
463 * Restore (and sync switches to) the global state from the
464 * states in rfkill_default_states. This can undo the effects of
465 * a call to rfkill_epo().
466 */
467void rfkill_restore_states(void)
468{
469 int i;
470
471 if (atomic_read(&rfkill_input_disabled))
472 return;
473
474 mutex_lock(&rfkill_global_mutex);
475
476 rfkill_epo_lock_active = false;
477 for (i = 0; i < NUM_RFKILL_TYPES; i++)
478 __rfkill_switch_all(i, rfkill_global_states[i].sav);
479 mutex_unlock(&rfkill_global_mutex);
480}
481
482/**
483 * rfkill_remove_epo_lock - unlock state changes
484 *
485 * Used by rfkill-input manually unlock state changes, when
486 * the EPO switch is deactivated.
487 */
488void rfkill_remove_epo_lock(void)
489{
490 if (atomic_read(&rfkill_input_disabled))
491 return;
492
493 mutex_lock(&rfkill_global_mutex);
494 rfkill_epo_lock_active = false;
495 mutex_unlock(&rfkill_global_mutex);
496}
497
498/**
499 * rfkill_is_epo_lock_active - returns true EPO is active
500 *
501 * Returns 0 (false) if there is NOT an active EPO condition,
502 * and 1 (true) if there is an active EPO condition, which
503 * locks all radios in one of the BLOCKED states.
504 *
505 * Can be called in atomic context.
506 */
507bool rfkill_is_epo_lock_active(void)
508{
509 return rfkill_epo_lock_active;
510}
511
512/**
513 * rfkill_get_global_sw_state - returns global state for a type
514 * @type: the type to get the global state of
515 *
516 * Returns the current global state for a given wireless
517 * device type.
518 */
519bool rfkill_get_global_sw_state(const enum rfkill_type type)
520{
521 return rfkill_global_states[type].cur;
522}
523#endif
524
525bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
526{
527 unsigned long flags;
528 bool ret, prev;
529
530 BUG_ON(!rfkill);
531
532 spin_lock_irqsave(&rfkill->lock, flags);
533 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
534 if (blocked)
535 rfkill->state |= RFKILL_BLOCK_HW;
536 else
537 rfkill->state &= ~RFKILL_BLOCK_HW;
538 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
539 spin_unlock_irqrestore(&rfkill->lock, flags);
540
541 rfkill_led_trigger_event(rfkill);
542 rfkill_global_led_trigger_event();
543
544 if (rfkill->registered && prev != blocked)
545 schedule_work(&rfkill->uevent_work);
546
547 return ret;
548}
549EXPORT_SYMBOL(rfkill_set_hw_state);
550
551static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
552{
553 u32 bit = RFKILL_BLOCK_SW;
554
555 /* if in a ops->set_block right now, use other bit */
556 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
557 bit = RFKILL_BLOCK_SW_PREV;
558
559 if (blocked)
560 rfkill->state |= bit;
561 else
562 rfkill->state &= ~bit;
563}
564
565bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
566{
567 unsigned long flags;
568 bool prev, hwblock;
569
570 BUG_ON(!rfkill);
571
572 spin_lock_irqsave(&rfkill->lock, flags);
573 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
574 __rfkill_set_sw_state(rfkill, blocked);
575 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
576 blocked = blocked || hwblock;
577 spin_unlock_irqrestore(&rfkill->lock, flags);
578
579 if (!rfkill->registered)
580 return blocked;
581
582 if (prev != blocked && !hwblock)
583 schedule_work(&rfkill->uevent_work);
584
585 rfkill_led_trigger_event(rfkill);
586 rfkill_global_led_trigger_event();
587
588 return blocked;
589}
590EXPORT_SYMBOL(rfkill_set_sw_state);
591
592void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
593{
594 unsigned long flags;
595
596 BUG_ON(!rfkill);
597 BUG_ON(rfkill->registered);
598
599 spin_lock_irqsave(&rfkill->lock, flags);
600 __rfkill_set_sw_state(rfkill, blocked);
601 rfkill->persistent = true;
602 spin_unlock_irqrestore(&rfkill->lock, flags);
603}
604EXPORT_SYMBOL(rfkill_init_sw_state);
605
606void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
607{
608 unsigned long flags;
609 bool swprev, hwprev;
610
611 BUG_ON(!rfkill);
612
613 spin_lock_irqsave(&rfkill->lock, flags);
614
615 /*
616 * No need to care about prev/setblock ... this is for uevent only
617 * and that will get triggered by rfkill_set_block anyway.
618 */
619 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
620 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
621 __rfkill_set_sw_state(rfkill, sw);
622 if (hw)
623 rfkill->state |= RFKILL_BLOCK_HW;
624 else
625 rfkill->state &= ~RFKILL_BLOCK_HW;
626
627 spin_unlock_irqrestore(&rfkill->lock, flags);
628
629 if (!rfkill->registered) {
630 rfkill->persistent = true;
631 } else {
632 if (swprev != sw || hwprev != hw)
633 schedule_work(&rfkill->uevent_work);
634
635 rfkill_led_trigger_event(rfkill);
636 rfkill_global_led_trigger_event();
637 }
638}
639EXPORT_SYMBOL(rfkill_set_states);
640
641static const char * const rfkill_types[] = {
642 NULL, /* RFKILL_TYPE_ALL */
643 "wlan",
644 "bluetooth",
645 "ultrawideband",
646 "wimax",
647 "wwan",
648 "gps",
649 "fm",
650 "nfc",
651};
652
653enum rfkill_type rfkill_find_type(const char *name)
654{
655 int i;
656
657 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
658
659 if (!name)
660 return RFKILL_TYPE_ALL;
661
662 for (i = 1; i < NUM_RFKILL_TYPES; i++)
663 if (!strcmp(name, rfkill_types[i]))
664 return i;
665 return RFKILL_TYPE_ALL;
666}
667EXPORT_SYMBOL(rfkill_find_type);
668
669static ssize_t name_show(struct device *dev, struct device_attribute *attr,
670 char *buf)
671{
672 struct rfkill *rfkill = to_rfkill(dev);
673
674 return sprintf(buf, "%s\n", rfkill->name);
675}
676static DEVICE_ATTR_RO(name);
677
678static ssize_t type_show(struct device *dev, struct device_attribute *attr,
679 char *buf)
680{
681 struct rfkill *rfkill = to_rfkill(dev);
682
683 return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
684}
685static DEVICE_ATTR_RO(type);
686
687static ssize_t index_show(struct device *dev, struct device_attribute *attr,
688 char *buf)
689{
690 struct rfkill *rfkill = to_rfkill(dev);
691
692 return sprintf(buf, "%d\n", rfkill->idx);
693}
694static DEVICE_ATTR_RO(index);
695
696static ssize_t persistent_show(struct device *dev,
697 struct device_attribute *attr, char *buf)
698{
699 struct rfkill *rfkill = to_rfkill(dev);
700
701 return sprintf(buf, "%d\n", rfkill->persistent);
702}
703static DEVICE_ATTR_RO(persistent);
704
705static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
706 char *buf)
707{
708 struct rfkill *rfkill = to_rfkill(dev);
709
710 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
711}
712static DEVICE_ATTR_RO(hard);
713
714static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
715 char *buf)
716{
717 struct rfkill *rfkill = to_rfkill(dev);
718
719 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
720}
721
722static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
723 const char *buf, size_t count)
724{
725 struct rfkill *rfkill = to_rfkill(dev);
726 unsigned long state;
727 int err;
728
729 if (!capable(CAP_NET_ADMIN))
730 return -EPERM;
731
732 err = kstrtoul(buf, 0, &state);
733 if (err)
734 return err;
735
736 if (state > 1 )
737 return -EINVAL;
738
739 mutex_lock(&rfkill_global_mutex);
740 rfkill_set_block(rfkill, state);
741 mutex_unlock(&rfkill_global_mutex);
742
743 return count;
744}
745static DEVICE_ATTR_RW(soft);
746
747static u8 user_state_from_blocked(unsigned long state)
748{
749 if (state & RFKILL_BLOCK_HW)
750 return RFKILL_USER_STATE_HARD_BLOCKED;
751 if (state & RFKILL_BLOCK_SW)
752 return RFKILL_USER_STATE_SOFT_BLOCKED;
753
754 return RFKILL_USER_STATE_UNBLOCKED;
755}
756
757static ssize_t state_show(struct device *dev, struct device_attribute *attr,
758 char *buf)
759{
760 struct rfkill *rfkill = to_rfkill(dev);
761
762 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
763}
764
765static ssize_t state_store(struct device *dev, struct device_attribute *attr,
766 const char *buf, size_t count)
767{
768 struct rfkill *rfkill = to_rfkill(dev);
769 unsigned long state;
770 int err;
771
772 if (!capable(CAP_NET_ADMIN))
773 return -EPERM;
774
775 err = kstrtoul(buf, 0, &state);
776 if (err)
777 return err;
778
779 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
780 state != RFKILL_USER_STATE_UNBLOCKED)
781 return -EINVAL;
782
783 mutex_lock(&rfkill_global_mutex);
784 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
785 mutex_unlock(&rfkill_global_mutex);
786
787 return count;
788}
789static DEVICE_ATTR_RW(state);
790
791static struct attribute *rfkill_dev_attrs[] = {
792 &dev_attr_name.attr,
793 &dev_attr_type.attr,
794 &dev_attr_index.attr,
795 &dev_attr_persistent.attr,
796 &dev_attr_state.attr,
797 &dev_attr_soft.attr,
798 &dev_attr_hard.attr,
799 NULL,
800};
801ATTRIBUTE_GROUPS(rfkill_dev);
802
803static void rfkill_release(struct device *dev)
804{
805 struct rfkill *rfkill = to_rfkill(dev);
806
807 kfree(rfkill);
808}
809
810static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
811{
812 struct rfkill *rfkill = to_rfkill(dev);
813 unsigned long flags;
814 u32 state;
815 int error;
816
817 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
818 if (error)
819 return error;
820 error = add_uevent_var(env, "RFKILL_TYPE=%s",
821 rfkill_types[rfkill->type]);
822 if (error)
823 return error;
824 spin_lock_irqsave(&rfkill->lock, flags);
825 state = rfkill->state;
826 spin_unlock_irqrestore(&rfkill->lock, flags);
827 error = add_uevent_var(env, "RFKILL_STATE=%d",
828 user_state_from_blocked(state));
829 return error;
830}
831
832void rfkill_pause_polling(struct rfkill *rfkill)
833{
834 BUG_ON(!rfkill);
835
836 if (!rfkill->ops->poll)
837 return;
838
839 rfkill->polling_paused = true;
840 cancel_delayed_work_sync(&rfkill->poll_work);
841}
842EXPORT_SYMBOL(rfkill_pause_polling);
843
844void rfkill_resume_polling(struct rfkill *rfkill)
845{
846 BUG_ON(!rfkill);
847
848 if (!rfkill->ops->poll)
849 return;
850
851 rfkill->polling_paused = false;
852
853 if (rfkill->suspended)
854 return;
855
856 queue_delayed_work(system_power_efficient_wq,
857 &rfkill->poll_work, 0);
858}
859EXPORT_SYMBOL(rfkill_resume_polling);
860
861#ifdef CONFIG_PM_SLEEP
862static int rfkill_suspend(struct device *dev)
863{
864 struct rfkill *rfkill = to_rfkill(dev);
865
866 rfkill->suspended = true;
867 cancel_delayed_work_sync(&rfkill->poll_work);
868
869 return 0;
870}
871
872static int rfkill_resume(struct device *dev)
873{
874 struct rfkill *rfkill = to_rfkill(dev);
875 bool cur;
876
877 rfkill->suspended = false;
878
879 if (!rfkill->persistent) {
880 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
881 rfkill_set_block(rfkill, cur);
882 }
883
884 if (rfkill->ops->poll && !rfkill->polling_paused)
885 queue_delayed_work(system_power_efficient_wq,
886 &rfkill->poll_work, 0);
887
888 return 0;
889}
890
891static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
892#define RFKILL_PM_OPS (&rfkill_pm_ops)
893#else
894#define RFKILL_PM_OPS NULL
895#endif
896
897static struct class rfkill_class = {
898 .name = "rfkill",
899 .dev_release = rfkill_release,
900 .dev_groups = rfkill_dev_groups,
901 .dev_uevent = rfkill_dev_uevent,
902 .pm = RFKILL_PM_OPS,
903};
904
905bool rfkill_blocked(struct rfkill *rfkill)
906{
907 unsigned long flags;
908 u32 state;
909
910 spin_lock_irqsave(&rfkill->lock, flags);
911 state = rfkill->state;
912 spin_unlock_irqrestore(&rfkill->lock, flags);
913
914 return !!(state & RFKILL_BLOCK_ANY);
915}
916EXPORT_SYMBOL(rfkill_blocked);
917
918
919struct rfkill * __must_check rfkill_alloc(const char *name,
920 struct device *parent,
921 const enum rfkill_type type,
922 const struct rfkill_ops *ops,
923 void *ops_data)
924{
925 struct rfkill *rfkill;
926 struct device *dev;
927
928 if (WARN_ON(!ops))
929 return NULL;
930
931 if (WARN_ON(!ops->set_block))
932 return NULL;
933
934 if (WARN_ON(!name))
935 return NULL;
936
937 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
938 return NULL;
939
940 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
941 if (!rfkill)
942 return NULL;
943
944 spin_lock_init(&rfkill->lock);
945 INIT_LIST_HEAD(&rfkill->node);
946 rfkill->type = type;
947 strcpy(rfkill->name, name);
948 rfkill->ops = ops;
949 rfkill->data = ops_data;
950
951 dev = &rfkill->dev;
952 dev->class = &rfkill_class;
953 dev->parent = parent;
954 device_initialize(dev);
955
956 return rfkill;
957}
958EXPORT_SYMBOL(rfkill_alloc);
959
960static void rfkill_poll(struct work_struct *work)
961{
962 struct rfkill *rfkill;
963
964 rfkill = container_of(work, struct rfkill, poll_work.work);
965
966 /*
967 * Poll hardware state -- driver will use one of the
968 * rfkill_set{,_hw,_sw}_state functions and use its
969 * return value to update the current status.
970 */
971 rfkill->ops->poll(rfkill, rfkill->data);
972
973 queue_delayed_work(system_power_efficient_wq,
974 &rfkill->poll_work,
975 round_jiffies_relative(POLL_INTERVAL));
976}
977
978static void rfkill_uevent_work(struct work_struct *work)
979{
980 struct rfkill *rfkill;
981
982 rfkill = container_of(work, struct rfkill, uevent_work);
983
984 mutex_lock(&rfkill_global_mutex);
985 rfkill_event(rfkill);
986 mutex_unlock(&rfkill_global_mutex);
987}
988
989static void rfkill_sync_work(struct work_struct *work)
990{
991 struct rfkill *rfkill;
992 bool cur;
993
994 rfkill = container_of(work, struct rfkill, sync_work);
995
996 mutex_lock(&rfkill_global_mutex);
997 cur = rfkill_global_states[rfkill->type].cur;
998 rfkill_set_block(rfkill, cur);
999 mutex_unlock(&rfkill_global_mutex);
1000}
1001
1002int __must_check rfkill_register(struct rfkill *rfkill)
1003{
1004 static unsigned long rfkill_no;
1005 struct device *dev;
1006 int error;
1007
1008 if (!rfkill)
1009 return -EINVAL;
1010
1011 dev = &rfkill->dev;
1012
1013 mutex_lock(&rfkill_global_mutex);
1014
1015 if (rfkill->registered) {
1016 error = -EALREADY;
1017 goto unlock;
1018 }
1019
1020 rfkill->idx = rfkill_no;
1021 dev_set_name(dev, "rfkill%lu", rfkill_no);
1022 rfkill_no++;
1023
1024 list_add_tail(&rfkill->node, &rfkill_list);
1025
1026 error = device_add(dev);
1027 if (error)
1028 goto remove;
1029
1030 error = rfkill_led_trigger_register(rfkill);
1031 if (error)
1032 goto devdel;
1033
1034 rfkill->registered = true;
1035
1036 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1037 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1038 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1039
1040 if (rfkill->ops->poll)
1041 queue_delayed_work(system_power_efficient_wq,
1042 &rfkill->poll_work,
1043 round_jiffies_relative(POLL_INTERVAL));
1044
1045 if (!rfkill->persistent || rfkill_epo_lock_active) {
1046 schedule_work(&rfkill->sync_work);
1047 } else {
1048#ifdef CONFIG_RFKILL_INPUT
1049 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1050
1051 if (!atomic_read(&rfkill_input_disabled))
1052 __rfkill_switch_all(rfkill->type, soft_blocked);
1053#endif
1054 }
1055
1056 rfkill_global_led_trigger_event();
1057 rfkill_send_events(rfkill, RFKILL_OP_ADD);
1058
1059 mutex_unlock(&rfkill_global_mutex);
1060 return 0;
1061
1062 devdel:
1063 device_del(&rfkill->dev);
1064 remove:
1065 list_del_init(&rfkill->node);
1066 unlock:
1067 mutex_unlock(&rfkill_global_mutex);
1068 return error;
1069}
1070EXPORT_SYMBOL(rfkill_register);
1071
1072void rfkill_unregister(struct rfkill *rfkill)
1073{
1074 BUG_ON(!rfkill);
1075
1076 if (rfkill->ops->poll)
1077 cancel_delayed_work_sync(&rfkill->poll_work);
1078
1079 cancel_work_sync(&rfkill->uevent_work);
1080 cancel_work_sync(&rfkill->sync_work);
1081
1082 rfkill->registered = false;
1083
1084 device_del(&rfkill->dev);
1085
1086 mutex_lock(&rfkill_global_mutex);
1087 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1088 list_del_init(&rfkill->node);
1089 rfkill_global_led_trigger_event();
1090 mutex_unlock(&rfkill_global_mutex);
1091
1092 rfkill_led_trigger_unregister(rfkill);
1093}
1094EXPORT_SYMBOL(rfkill_unregister);
1095
1096void rfkill_destroy(struct rfkill *rfkill)
1097{
1098 if (rfkill)
1099 put_device(&rfkill->dev);
1100}
1101EXPORT_SYMBOL(rfkill_destroy);
1102
1103static int rfkill_fop_open(struct inode *inode, struct file *file)
1104{
1105 struct rfkill_data *data;
1106 struct rfkill *rfkill;
1107 struct rfkill_int_event *ev, *tmp;
1108
1109 data = kzalloc(sizeof(*data), GFP_KERNEL);
1110 if (!data)
1111 return -ENOMEM;
1112
1113 INIT_LIST_HEAD(&data->events);
1114 mutex_init(&data->mtx);
1115 init_waitqueue_head(&data->read_wait);
1116
1117 mutex_lock(&rfkill_global_mutex);
1118 mutex_lock(&data->mtx);
1119 /*
1120 * start getting events from elsewhere but hold mtx to get
1121 * startup events added first
1122 */
1123
1124 list_for_each_entry(rfkill, &rfkill_list, node) {
1125 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1126 if (!ev)
1127 goto free;
1128 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1129 list_add_tail(&ev->list, &data->events);
1130 }
1131 list_add(&data->list, &rfkill_fds);
1132 mutex_unlock(&data->mtx);
1133 mutex_unlock(&rfkill_global_mutex);
1134
1135 file->private_data = data;
1136
1137 return stream_open(inode, file);
1138
1139 free:
1140 mutex_unlock(&data->mtx);
1141 mutex_unlock(&rfkill_global_mutex);
1142 mutex_destroy(&data->mtx);
1143 list_for_each_entry_safe(ev, tmp, &data->events, list)
1144 kfree(ev);
1145 kfree(data);
1146 return -ENOMEM;
1147}
1148
1149static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1150{
1151 struct rfkill_data *data = file->private_data;
1152 __poll_t res = EPOLLOUT | EPOLLWRNORM;
1153
1154 poll_wait(file, &data->read_wait, wait);
1155
1156 mutex_lock(&data->mtx);
1157 if (!list_empty(&data->events))
1158 res = EPOLLIN | EPOLLRDNORM;
1159 mutex_unlock(&data->mtx);
1160
1161 return res;
1162}
1163
1164static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1165 size_t count, loff_t *pos)
1166{
1167 struct rfkill_data *data = file->private_data;
1168 struct rfkill_int_event *ev;
1169 unsigned long sz;
1170 int ret;
1171
1172 mutex_lock(&data->mtx);
1173
1174 while (list_empty(&data->events)) {
1175 if (file->f_flags & O_NONBLOCK) {
1176 ret = -EAGAIN;
1177 goto out;
1178 }
1179 mutex_unlock(&data->mtx);
1180 /* since we re-check and it just compares pointers,
1181 * using !list_empty() without locking isn't a problem
1182 */
1183 ret = wait_event_interruptible(data->read_wait,
1184 !list_empty(&data->events));
1185 mutex_lock(&data->mtx);
1186
1187 if (ret)
1188 goto out;
1189 }
1190
1191 ev = list_first_entry(&data->events, struct rfkill_int_event,
1192 list);
1193
1194 sz = min_t(unsigned long, sizeof(ev->ev), count);
1195 ret = sz;
1196 if (copy_to_user(buf, &ev->ev, sz))
1197 ret = -EFAULT;
1198
1199 list_del(&ev->list);
1200 kfree(ev);
1201 out:
1202 mutex_unlock(&data->mtx);
1203 return ret;
1204}
1205
1206static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1207 size_t count, loff_t *pos)
1208{
1209 struct rfkill *rfkill;
1210 struct rfkill_event ev;
1211 int ret;
1212
1213 /* we don't need the 'hard' variable but accept it */
1214 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1215 return -EINVAL;
1216
1217 /*
1218 * Copy as much data as we can accept into our 'ev' buffer,
1219 * but tell userspace how much we've copied so it can determine
1220 * our API version even in a write() call, if it cares.
1221 */
1222 count = min(count, sizeof(ev));
1223 if (copy_from_user(&ev, buf, count))
1224 return -EFAULT;
1225
1226 if (ev.type >= NUM_RFKILL_TYPES)
1227 return -EINVAL;
1228
1229 mutex_lock(&rfkill_global_mutex);
1230
1231 switch (ev.op) {
1232 case RFKILL_OP_CHANGE_ALL:
1233 rfkill_update_global_state(ev.type, ev.soft);
1234 list_for_each_entry(rfkill, &rfkill_list, node)
1235 if (rfkill->type == ev.type ||
1236 ev.type == RFKILL_TYPE_ALL)
1237 rfkill_set_block(rfkill, ev.soft);
1238 ret = 0;
1239 break;
1240 case RFKILL_OP_CHANGE:
1241 list_for_each_entry(rfkill, &rfkill_list, node)
1242 if (rfkill->idx == ev.idx &&
1243 (rfkill->type == ev.type ||
1244 ev.type == RFKILL_TYPE_ALL))
1245 rfkill_set_block(rfkill, ev.soft);
1246 ret = 0;
1247 break;
1248 default:
1249 ret = -EINVAL;
1250 break;
1251 }
1252
1253 mutex_unlock(&rfkill_global_mutex);
1254
1255 return ret ?: count;
1256}
1257
1258static int rfkill_fop_release(struct inode *inode, struct file *file)
1259{
1260 struct rfkill_data *data = file->private_data;
1261 struct rfkill_int_event *ev, *tmp;
1262
1263 mutex_lock(&rfkill_global_mutex);
1264 list_del(&data->list);
1265 mutex_unlock(&rfkill_global_mutex);
1266
1267 mutex_destroy(&data->mtx);
1268 list_for_each_entry_safe(ev, tmp, &data->events, list)
1269 kfree(ev);
1270
1271#ifdef CONFIG_RFKILL_INPUT
1272 if (data->input_handler)
1273 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1274 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1275#endif
1276
1277 kfree(data);
1278
1279 return 0;
1280}
1281
1282#ifdef CONFIG_RFKILL_INPUT
1283static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1284 unsigned long arg)
1285{
1286 struct rfkill_data *data = file->private_data;
1287
1288 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1289 return -ENOSYS;
1290
1291 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1292 return -ENOSYS;
1293
1294 mutex_lock(&data->mtx);
1295
1296 if (!data->input_handler) {
1297 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1298 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1299 data->input_handler = true;
1300 }
1301
1302 mutex_unlock(&data->mtx);
1303
1304 return 0;
1305}
1306#endif
1307
1308static const struct file_operations rfkill_fops = {
1309 .owner = THIS_MODULE,
1310 .open = rfkill_fop_open,
1311 .read = rfkill_fop_read,
1312 .write = rfkill_fop_write,
1313 .poll = rfkill_fop_poll,
1314 .release = rfkill_fop_release,
1315#ifdef CONFIG_RFKILL_INPUT
1316 .unlocked_ioctl = rfkill_fop_ioctl,
1317 .compat_ioctl = compat_ptr_ioctl,
1318#endif
1319 .llseek = no_llseek,
1320};
1321
1322#define RFKILL_NAME "rfkill"
1323
1324static struct miscdevice rfkill_miscdev = {
1325 .fops = &rfkill_fops,
1326 .name = RFKILL_NAME,
1327 .minor = RFKILL_MINOR,
1328};
1329
1330static int __init rfkill_init(void)
1331{
1332 int error;
1333
1334 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1335
1336 error = class_register(&rfkill_class);
1337 if (error)
1338 goto error_class;
1339
1340 error = misc_register(&rfkill_miscdev);
1341 if (error)
1342 goto error_misc;
1343
1344 error = rfkill_global_led_trigger_register();
1345 if (error)
1346 goto error_led_trigger;
1347
1348#ifdef CONFIG_RFKILL_INPUT
1349 error = rfkill_handler_init();
1350 if (error)
1351 goto error_input;
1352#endif
1353
1354 return 0;
1355
1356#ifdef CONFIG_RFKILL_INPUT
1357error_input:
1358 rfkill_global_led_trigger_unregister();
1359#endif
1360error_led_trigger:
1361 misc_deregister(&rfkill_miscdev);
1362error_misc:
1363 class_unregister(&rfkill_class);
1364error_class:
1365 return error;
1366}
1367subsys_initcall(rfkill_init);
1368
1369static void __exit rfkill_exit(void)
1370{
1371#ifdef CONFIG_RFKILL_INPUT
1372 rfkill_handler_exit();
1373#endif
1374 rfkill_global_led_trigger_unregister();
1375 misc_deregister(&rfkill_miscdev);
1376 class_unregister(&rfkill_class);
1377}
1378module_exit(rfkill_exit);
1379
1380MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1381MODULE_ALIAS("devname:" RFKILL_NAME);
1/*
2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the
18 * Free Software Foundation, Inc.,
19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/workqueue.h>
26#include <linux/capability.h>
27#include <linux/list.h>
28#include <linux/mutex.h>
29#include <linux/rfkill.h>
30#include <linux/sched.h>
31#include <linux/spinlock.h>
32#include <linux/device.h>
33#include <linux/miscdevice.h>
34#include <linux/wait.h>
35#include <linux/poll.h>
36#include <linux/fs.h>
37#include <linux/slab.h>
38
39#include "rfkill.h"
40
41#define POLL_INTERVAL (5 * HZ)
42
43#define RFKILL_BLOCK_HW BIT(0)
44#define RFKILL_BLOCK_SW BIT(1)
45#define RFKILL_BLOCK_SW_PREV BIT(2)
46#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
47 RFKILL_BLOCK_SW |\
48 RFKILL_BLOCK_SW_PREV)
49#define RFKILL_BLOCK_SW_SETCALL BIT(31)
50
51struct rfkill {
52 spinlock_t lock;
53
54 const char *name;
55 enum rfkill_type type;
56
57 unsigned long state;
58
59 u32 idx;
60
61 bool registered;
62 bool persistent;
63
64 const struct rfkill_ops *ops;
65 void *data;
66
67#ifdef CONFIG_RFKILL_LEDS
68 struct led_trigger led_trigger;
69 const char *ledtrigname;
70#endif
71
72 struct device dev;
73 struct list_head node;
74
75 struct delayed_work poll_work;
76 struct work_struct uevent_work;
77 struct work_struct sync_work;
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
153static int rfkill_led_trigger_register(struct rfkill *rfkill)
154{
155 rfkill->led_trigger.name = rfkill->ledtrigname
156 ? : dev_name(&rfkill->dev);
157 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
158 return led_trigger_register(&rfkill->led_trigger);
159}
160
161static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
162{
163 led_trigger_unregister(&rfkill->led_trigger);
164}
165#else
166static void rfkill_led_trigger_event(struct rfkill *rfkill)
167{
168}
169
170static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
171{
172 return 0;
173}
174
175static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
176{
177}
178#endif /* CONFIG_RFKILL_LEDS */
179
180static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
181 enum rfkill_operation op)
182{
183 unsigned long flags;
184
185 ev->idx = rfkill->idx;
186 ev->type = rfkill->type;
187 ev->op = op;
188
189 spin_lock_irqsave(&rfkill->lock, flags);
190 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
191 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
192 RFKILL_BLOCK_SW_PREV));
193 spin_unlock_irqrestore(&rfkill->lock, flags);
194}
195
196static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
197{
198 struct rfkill_data *data;
199 struct rfkill_int_event *ev;
200
201 list_for_each_entry(data, &rfkill_fds, list) {
202 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
203 if (!ev)
204 continue;
205 rfkill_fill_event(&ev->ev, rfkill, op);
206 mutex_lock(&data->mtx);
207 list_add_tail(&ev->list, &data->events);
208 mutex_unlock(&data->mtx);
209 wake_up_interruptible(&data->read_wait);
210 }
211}
212
213static void rfkill_event(struct rfkill *rfkill)
214{
215 if (!rfkill->registered)
216 return;
217
218 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
219
220 /* also send event to /dev/rfkill */
221 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
222}
223
224static bool __rfkill_set_hw_state(struct rfkill *rfkill,
225 bool blocked, bool *change)
226{
227 unsigned long flags;
228 bool prev, any;
229
230 BUG_ON(!rfkill);
231
232 spin_lock_irqsave(&rfkill->lock, flags);
233 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
234 if (blocked)
235 rfkill->state |= RFKILL_BLOCK_HW;
236 else
237 rfkill->state &= ~RFKILL_BLOCK_HW;
238 *change = prev != blocked;
239 any = !!(rfkill->state & RFKILL_BLOCK_ANY);
240 spin_unlock_irqrestore(&rfkill->lock, flags);
241
242 rfkill_led_trigger_event(rfkill);
243
244 return any;
245}
246
247/**
248 * rfkill_set_block - wrapper for set_block method
249 *
250 * @rfkill: the rfkill struct to use
251 * @blocked: the new software state
252 *
253 * Calls the set_block method (when applicable) and handles notifications
254 * etc. as well.
255 */
256static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
257{
258 unsigned long flags;
259 int err;
260
261 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
262 return;
263
264 /*
265 * Some platforms (...!) generate input events which affect the
266 * _hard_ kill state -- whenever something tries to change the
267 * current software state query the hardware state too.
268 */
269 if (rfkill->ops->query)
270 rfkill->ops->query(rfkill, rfkill->data);
271
272 spin_lock_irqsave(&rfkill->lock, flags);
273 if (rfkill->state & RFKILL_BLOCK_SW)
274 rfkill->state |= RFKILL_BLOCK_SW_PREV;
275 else
276 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
277
278 if (blocked)
279 rfkill->state |= RFKILL_BLOCK_SW;
280 else
281 rfkill->state &= ~RFKILL_BLOCK_SW;
282
283 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
284 spin_unlock_irqrestore(&rfkill->lock, flags);
285
286 err = rfkill->ops->set_block(rfkill->data, blocked);
287
288 spin_lock_irqsave(&rfkill->lock, flags);
289 if (err) {
290 /*
291 * Failed -- reset status to _prev, this may be different
292 * from what set set _PREV to earlier in this function
293 * if rfkill_set_sw_state was invoked.
294 */
295 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
296 rfkill->state |= RFKILL_BLOCK_SW;
297 else
298 rfkill->state &= ~RFKILL_BLOCK_SW;
299 }
300 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
301 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
302 spin_unlock_irqrestore(&rfkill->lock, flags);
303
304 rfkill_led_trigger_event(rfkill);
305 rfkill_event(rfkill);
306}
307
308#ifdef CONFIG_RFKILL_INPUT
309static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
310
311/**
312 * __rfkill_switch_all - Toggle state of all switches of given type
313 * @type: type of interfaces to be affected
314 * @state: the new state
315 *
316 * This function sets the state of all switches of given type,
317 * unless a specific switch is claimed by userspace (in which case,
318 * that switch is left alone) or suspended.
319 *
320 * Caller must have acquired rfkill_global_mutex.
321 */
322static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
323{
324 struct rfkill *rfkill;
325
326 rfkill_global_states[type].cur = blocked;
327 list_for_each_entry(rfkill, &rfkill_list, node) {
328 if (rfkill->type != type)
329 continue;
330
331 rfkill_set_block(rfkill, blocked);
332 }
333}
334
335/**
336 * rfkill_switch_all - Toggle state of all switches of given type
337 * @type: type of interfaces to be affected
338 * @state: the new state
339 *
340 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
341 * Please refer to __rfkill_switch_all() for details.
342 *
343 * Does nothing if the EPO lock is active.
344 */
345void rfkill_switch_all(enum rfkill_type type, bool blocked)
346{
347 if (atomic_read(&rfkill_input_disabled))
348 return;
349
350 mutex_lock(&rfkill_global_mutex);
351
352 if (!rfkill_epo_lock_active)
353 __rfkill_switch_all(type, blocked);
354
355 mutex_unlock(&rfkill_global_mutex);
356}
357
358/**
359 * rfkill_epo - emergency power off all transmitters
360 *
361 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
362 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
363 *
364 * The global state before the EPO is saved and can be restored later
365 * using rfkill_restore_states().
366 */
367void rfkill_epo(void)
368{
369 struct rfkill *rfkill;
370 int i;
371
372 if (atomic_read(&rfkill_input_disabled))
373 return;
374
375 mutex_lock(&rfkill_global_mutex);
376
377 rfkill_epo_lock_active = true;
378 list_for_each_entry(rfkill, &rfkill_list, node)
379 rfkill_set_block(rfkill, true);
380
381 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
382 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
383 rfkill_global_states[i].cur = true;
384 }
385
386 mutex_unlock(&rfkill_global_mutex);
387}
388
389/**
390 * rfkill_restore_states - restore global states
391 *
392 * Restore (and sync switches to) the global state from the
393 * states in rfkill_default_states. This can undo the effects of
394 * a call to rfkill_epo().
395 */
396void rfkill_restore_states(void)
397{
398 int i;
399
400 if (atomic_read(&rfkill_input_disabled))
401 return;
402
403 mutex_lock(&rfkill_global_mutex);
404
405 rfkill_epo_lock_active = false;
406 for (i = 0; i < NUM_RFKILL_TYPES; i++)
407 __rfkill_switch_all(i, rfkill_global_states[i].sav);
408 mutex_unlock(&rfkill_global_mutex);
409}
410
411/**
412 * rfkill_remove_epo_lock - unlock state changes
413 *
414 * Used by rfkill-input manually unlock state changes, when
415 * the EPO switch is deactivated.
416 */
417void rfkill_remove_epo_lock(void)
418{
419 if (atomic_read(&rfkill_input_disabled))
420 return;
421
422 mutex_lock(&rfkill_global_mutex);
423 rfkill_epo_lock_active = false;
424 mutex_unlock(&rfkill_global_mutex);
425}
426
427/**
428 * rfkill_is_epo_lock_active - returns true EPO is active
429 *
430 * Returns 0 (false) if there is NOT an active EPO contidion,
431 * and 1 (true) if there is an active EPO contition, which
432 * locks all radios in one of the BLOCKED states.
433 *
434 * Can be called in atomic context.
435 */
436bool rfkill_is_epo_lock_active(void)
437{
438 return rfkill_epo_lock_active;
439}
440
441/**
442 * rfkill_get_global_sw_state - returns global state for a type
443 * @type: the type to get the global state of
444 *
445 * Returns the current global state for a given wireless
446 * device type.
447 */
448bool rfkill_get_global_sw_state(const enum rfkill_type type)
449{
450 return rfkill_global_states[type].cur;
451}
452#endif
453
454
455bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
456{
457 bool ret, change;
458
459 ret = __rfkill_set_hw_state(rfkill, blocked, &change);
460
461 if (!rfkill->registered)
462 return ret;
463
464 if (change)
465 schedule_work(&rfkill->uevent_work);
466
467 return ret;
468}
469EXPORT_SYMBOL(rfkill_set_hw_state);
470
471static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
472{
473 u32 bit = RFKILL_BLOCK_SW;
474
475 /* if in a ops->set_block right now, use other bit */
476 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
477 bit = RFKILL_BLOCK_SW_PREV;
478
479 if (blocked)
480 rfkill->state |= bit;
481 else
482 rfkill->state &= ~bit;
483}
484
485bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
486{
487 unsigned long flags;
488 bool prev, hwblock;
489
490 BUG_ON(!rfkill);
491
492 spin_lock_irqsave(&rfkill->lock, flags);
493 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
494 __rfkill_set_sw_state(rfkill, blocked);
495 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
496 blocked = blocked || hwblock;
497 spin_unlock_irqrestore(&rfkill->lock, flags);
498
499 if (!rfkill->registered)
500 return blocked;
501
502 if (prev != blocked && !hwblock)
503 schedule_work(&rfkill->uevent_work);
504
505 rfkill_led_trigger_event(rfkill);
506
507 return blocked;
508}
509EXPORT_SYMBOL(rfkill_set_sw_state);
510
511void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
512{
513 unsigned long flags;
514
515 BUG_ON(!rfkill);
516 BUG_ON(rfkill->registered);
517
518 spin_lock_irqsave(&rfkill->lock, flags);
519 __rfkill_set_sw_state(rfkill, blocked);
520 rfkill->persistent = true;
521 spin_unlock_irqrestore(&rfkill->lock, flags);
522}
523EXPORT_SYMBOL(rfkill_init_sw_state);
524
525void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
526{
527 unsigned long flags;
528 bool swprev, hwprev;
529
530 BUG_ON(!rfkill);
531
532 spin_lock_irqsave(&rfkill->lock, flags);
533
534 /*
535 * No need to care about prev/setblock ... this is for uevent only
536 * and that will get triggered by rfkill_set_block anyway.
537 */
538 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
539 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
540 __rfkill_set_sw_state(rfkill, sw);
541 if (hw)
542 rfkill->state |= RFKILL_BLOCK_HW;
543 else
544 rfkill->state &= ~RFKILL_BLOCK_HW;
545
546 spin_unlock_irqrestore(&rfkill->lock, flags);
547
548 if (!rfkill->registered) {
549 rfkill->persistent = true;
550 } else {
551 if (swprev != sw || hwprev != hw)
552 schedule_work(&rfkill->uevent_work);
553
554 rfkill_led_trigger_event(rfkill);
555 }
556}
557EXPORT_SYMBOL(rfkill_set_states);
558
559static ssize_t rfkill_name_show(struct device *dev,
560 struct device_attribute *attr,
561 char *buf)
562{
563 struct rfkill *rfkill = to_rfkill(dev);
564
565 return sprintf(buf, "%s\n", rfkill->name);
566}
567
568static const char *rfkill_get_type_str(enum rfkill_type type)
569{
570 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_FM + 1);
571
572 switch (type) {
573 case RFKILL_TYPE_WLAN:
574 return "wlan";
575 case RFKILL_TYPE_BLUETOOTH:
576 return "bluetooth";
577 case RFKILL_TYPE_UWB:
578 return "ultrawideband";
579 case RFKILL_TYPE_WIMAX:
580 return "wimax";
581 case RFKILL_TYPE_WWAN:
582 return "wwan";
583 case RFKILL_TYPE_GPS:
584 return "gps";
585 case RFKILL_TYPE_FM:
586 return "fm";
587 default:
588 BUG();
589 }
590}
591
592static ssize_t rfkill_type_show(struct device *dev,
593 struct device_attribute *attr,
594 char *buf)
595{
596 struct rfkill *rfkill = to_rfkill(dev);
597
598 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
599}
600
601static ssize_t rfkill_idx_show(struct device *dev,
602 struct device_attribute *attr,
603 char *buf)
604{
605 struct rfkill *rfkill = to_rfkill(dev);
606
607 return sprintf(buf, "%d\n", rfkill->idx);
608}
609
610static ssize_t rfkill_persistent_show(struct device *dev,
611 struct device_attribute *attr,
612 char *buf)
613{
614 struct rfkill *rfkill = to_rfkill(dev);
615
616 return sprintf(buf, "%d\n", rfkill->persistent);
617}
618
619static ssize_t rfkill_hard_show(struct device *dev,
620 struct device_attribute *attr,
621 char *buf)
622{
623 struct rfkill *rfkill = to_rfkill(dev);
624
625 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
626}
627
628static ssize_t rfkill_soft_show(struct device *dev,
629 struct device_attribute *attr,
630 char *buf)
631{
632 struct rfkill *rfkill = to_rfkill(dev);
633
634 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
635}
636
637static ssize_t rfkill_soft_store(struct device *dev,
638 struct device_attribute *attr,
639 const char *buf, size_t count)
640{
641 struct rfkill *rfkill = to_rfkill(dev);
642 unsigned long state;
643 int err;
644
645 if (!capable(CAP_NET_ADMIN))
646 return -EPERM;
647
648 err = kstrtoul(buf, 0, &state);
649 if (err)
650 return err;
651
652 if (state > 1 )
653 return -EINVAL;
654
655 mutex_lock(&rfkill_global_mutex);
656 rfkill_set_block(rfkill, state);
657 mutex_unlock(&rfkill_global_mutex);
658
659 return err ?: count;
660}
661
662static u8 user_state_from_blocked(unsigned long state)
663{
664 if (state & RFKILL_BLOCK_HW)
665 return RFKILL_USER_STATE_HARD_BLOCKED;
666 if (state & RFKILL_BLOCK_SW)
667 return RFKILL_USER_STATE_SOFT_BLOCKED;
668
669 return RFKILL_USER_STATE_UNBLOCKED;
670}
671
672static ssize_t rfkill_state_show(struct device *dev,
673 struct device_attribute *attr,
674 char *buf)
675{
676 struct rfkill *rfkill = to_rfkill(dev);
677
678 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
679}
680
681static ssize_t rfkill_state_store(struct device *dev,
682 struct device_attribute *attr,
683 const char *buf, size_t count)
684{
685 struct rfkill *rfkill = to_rfkill(dev);
686 unsigned long state;
687 int err;
688
689 if (!capable(CAP_NET_ADMIN))
690 return -EPERM;
691
692 err = kstrtoul(buf, 0, &state);
693 if (err)
694 return err;
695
696 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
697 state != RFKILL_USER_STATE_UNBLOCKED)
698 return -EINVAL;
699
700 mutex_lock(&rfkill_global_mutex);
701 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
702 mutex_unlock(&rfkill_global_mutex);
703
704 return err ?: count;
705}
706
707static ssize_t rfkill_claim_show(struct device *dev,
708 struct device_attribute *attr,
709 char *buf)
710{
711 return sprintf(buf, "%d\n", 0);
712}
713
714static ssize_t rfkill_claim_store(struct device *dev,
715 struct device_attribute *attr,
716 const char *buf, size_t count)
717{
718 return -EOPNOTSUPP;
719}
720
721static struct device_attribute rfkill_dev_attrs[] = {
722 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
723 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
724 __ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
725 __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
726 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
727 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
728 __ATTR(soft, S_IRUGO|S_IWUSR, rfkill_soft_show, rfkill_soft_store),
729 __ATTR(hard, S_IRUGO, rfkill_hard_show, NULL),
730 __ATTR_NULL
731};
732
733static void rfkill_release(struct device *dev)
734{
735 struct rfkill *rfkill = to_rfkill(dev);
736
737 kfree(rfkill);
738}
739
740static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
741{
742 struct rfkill *rfkill = to_rfkill(dev);
743 unsigned long flags;
744 u32 state;
745 int error;
746
747 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
748 if (error)
749 return error;
750 error = add_uevent_var(env, "RFKILL_TYPE=%s",
751 rfkill_get_type_str(rfkill->type));
752 if (error)
753 return error;
754 spin_lock_irqsave(&rfkill->lock, flags);
755 state = rfkill->state;
756 spin_unlock_irqrestore(&rfkill->lock, flags);
757 error = add_uevent_var(env, "RFKILL_STATE=%d",
758 user_state_from_blocked(state));
759 return error;
760}
761
762void rfkill_pause_polling(struct rfkill *rfkill)
763{
764 BUG_ON(!rfkill);
765
766 if (!rfkill->ops->poll)
767 return;
768
769 cancel_delayed_work_sync(&rfkill->poll_work);
770}
771EXPORT_SYMBOL(rfkill_pause_polling);
772
773void rfkill_resume_polling(struct rfkill *rfkill)
774{
775 BUG_ON(!rfkill);
776
777 if (!rfkill->ops->poll)
778 return;
779
780 schedule_work(&rfkill->poll_work.work);
781}
782EXPORT_SYMBOL(rfkill_resume_polling);
783
784static int rfkill_suspend(struct device *dev, pm_message_t state)
785{
786 struct rfkill *rfkill = to_rfkill(dev);
787
788 rfkill_pause_polling(rfkill);
789
790 return 0;
791}
792
793static int rfkill_resume(struct device *dev)
794{
795 struct rfkill *rfkill = to_rfkill(dev);
796 bool cur;
797
798 if (!rfkill->persistent) {
799 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
800 rfkill_set_block(rfkill, cur);
801 }
802
803 rfkill_resume_polling(rfkill);
804
805 return 0;
806}
807
808static struct class rfkill_class = {
809 .name = "rfkill",
810 .dev_release = rfkill_release,
811 .dev_attrs = rfkill_dev_attrs,
812 .dev_uevent = rfkill_dev_uevent,
813 .suspend = rfkill_suspend,
814 .resume = rfkill_resume,
815};
816
817bool rfkill_blocked(struct rfkill *rfkill)
818{
819 unsigned long flags;
820 u32 state;
821
822 spin_lock_irqsave(&rfkill->lock, flags);
823 state = rfkill->state;
824 spin_unlock_irqrestore(&rfkill->lock, flags);
825
826 return !!(state & RFKILL_BLOCK_ANY);
827}
828EXPORT_SYMBOL(rfkill_blocked);
829
830
831struct rfkill * __must_check rfkill_alloc(const char *name,
832 struct device *parent,
833 const enum rfkill_type type,
834 const struct rfkill_ops *ops,
835 void *ops_data)
836{
837 struct rfkill *rfkill;
838 struct device *dev;
839
840 if (WARN_ON(!ops))
841 return NULL;
842
843 if (WARN_ON(!ops->set_block))
844 return NULL;
845
846 if (WARN_ON(!name))
847 return NULL;
848
849 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
850 return NULL;
851
852 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
853 if (!rfkill)
854 return NULL;
855
856 spin_lock_init(&rfkill->lock);
857 INIT_LIST_HEAD(&rfkill->node);
858 rfkill->type = type;
859 rfkill->name = name;
860 rfkill->ops = ops;
861 rfkill->data = ops_data;
862
863 dev = &rfkill->dev;
864 dev->class = &rfkill_class;
865 dev->parent = parent;
866 device_initialize(dev);
867
868 return rfkill;
869}
870EXPORT_SYMBOL(rfkill_alloc);
871
872static void rfkill_poll(struct work_struct *work)
873{
874 struct rfkill *rfkill;
875
876 rfkill = container_of(work, struct rfkill, poll_work.work);
877
878 /*
879 * Poll hardware state -- driver will use one of the
880 * rfkill_set{,_hw,_sw}_state functions and use its
881 * return value to update the current status.
882 */
883 rfkill->ops->poll(rfkill, rfkill->data);
884
885 schedule_delayed_work(&rfkill->poll_work,
886 round_jiffies_relative(POLL_INTERVAL));
887}
888
889static void rfkill_uevent_work(struct work_struct *work)
890{
891 struct rfkill *rfkill;
892
893 rfkill = container_of(work, struct rfkill, uevent_work);
894
895 mutex_lock(&rfkill_global_mutex);
896 rfkill_event(rfkill);
897 mutex_unlock(&rfkill_global_mutex);
898}
899
900static void rfkill_sync_work(struct work_struct *work)
901{
902 struct rfkill *rfkill;
903 bool cur;
904
905 rfkill = container_of(work, struct rfkill, sync_work);
906
907 mutex_lock(&rfkill_global_mutex);
908 cur = rfkill_global_states[rfkill->type].cur;
909 rfkill_set_block(rfkill, cur);
910 mutex_unlock(&rfkill_global_mutex);
911}
912
913int __must_check rfkill_register(struct rfkill *rfkill)
914{
915 static unsigned long rfkill_no;
916 struct device *dev = &rfkill->dev;
917 int error;
918
919 BUG_ON(!rfkill);
920
921 mutex_lock(&rfkill_global_mutex);
922
923 if (rfkill->registered) {
924 error = -EALREADY;
925 goto unlock;
926 }
927
928 rfkill->idx = rfkill_no;
929 dev_set_name(dev, "rfkill%lu", rfkill_no);
930 rfkill_no++;
931
932 list_add_tail(&rfkill->node, &rfkill_list);
933
934 error = device_add(dev);
935 if (error)
936 goto remove;
937
938 error = rfkill_led_trigger_register(rfkill);
939 if (error)
940 goto devdel;
941
942 rfkill->registered = true;
943
944 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
945 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
946 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
947
948 if (rfkill->ops->poll)
949 schedule_delayed_work(&rfkill->poll_work,
950 round_jiffies_relative(POLL_INTERVAL));
951
952 if (!rfkill->persistent || rfkill_epo_lock_active) {
953 schedule_work(&rfkill->sync_work);
954 } else {
955#ifdef CONFIG_RFKILL_INPUT
956 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
957
958 if (!atomic_read(&rfkill_input_disabled))
959 __rfkill_switch_all(rfkill->type, soft_blocked);
960#endif
961 }
962
963 rfkill_send_events(rfkill, RFKILL_OP_ADD);
964
965 mutex_unlock(&rfkill_global_mutex);
966 return 0;
967
968 devdel:
969 device_del(&rfkill->dev);
970 remove:
971 list_del_init(&rfkill->node);
972 unlock:
973 mutex_unlock(&rfkill_global_mutex);
974 return error;
975}
976EXPORT_SYMBOL(rfkill_register);
977
978void rfkill_unregister(struct rfkill *rfkill)
979{
980 BUG_ON(!rfkill);
981
982 if (rfkill->ops->poll)
983 cancel_delayed_work_sync(&rfkill->poll_work);
984
985 cancel_work_sync(&rfkill->uevent_work);
986 cancel_work_sync(&rfkill->sync_work);
987
988 rfkill->registered = false;
989
990 device_del(&rfkill->dev);
991
992 mutex_lock(&rfkill_global_mutex);
993 rfkill_send_events(rfkill, RFKILL_OP_DEL);
994 list_del_init(&rfkill->node);
995 mutex_unlock(&rfkill_global_mutex);
996
997 rfkill_led_trigger_unregister(rfkill);
998}
999EXPORT_SYMBOL(rfkill_unregister);
1000
1001void rfkill_destroy(struct rfkill *rfkill)
1002{
1003 if (rfkill)
1004 put_device(&rfkill->dev);
1005}
1006EXPORT_SYMBOL(rfkill_destroy);
1007
1008static int rfkill_fop_open(struct inode *inode, struct file *file)
1009{
1010 struct rfkill_data *data;
1011 struct rfkill *rfkill;
1012 struct rfkill_int_event *ev, *tmp;
1013
1014 data = kzalloc(sizeof(*data), GFP_KERNEL);
1015 if (!data)
1016 return -ENOMEM;
1017
1018 INIT_LIST_HEAD(&data->events);
1019 mutex_init(&data->mtx);
1020 init_waitqueue_head(&data->read_wait);
1021
1022 mutex_lock(&rfkill_global_mutex);
1023 mutex_lock(&data->mtx);
1024 /*
1025 * start getting events from elsewhere but hold mtx to get
1026 * startup events added first
1027 */
1028
1029 list_for_each_entry(rfkill, &rfkill_list, node) {
1030 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1031 if (!ev)
1032 goto free;
1033 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1034 list_add_tail(&ev->list, &data->events);
1035 }
1036 list_add(&data->list, &rfkill_fds);
1037 mutex_unlock(&data->mtx);
1038 mutex_unlock(&rfkill_global_mutex);
1039
1040 file->private_data = data;
1041
1042 return nonseekable_open(inode, file);
1043
1044 free:
1045 mutex_unlock(&data->mtx);
1046 mutex_unlock(&rfkill_global_mutex);
1047 mutex_destroy(&data->mtx);
1048 list_for_each_entry_safe(ev, tmp, &data->events, list)
1049 kfree(ev);
1050 kfree(data);
1051 return -ENOMEM;
1052}
1053
1054static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1055{
1056 struct rfkill_data *data = file->private_data;
1057 unsigned int res = POLLOUT | POLLWRNORM;
1058
1059 poll_wait(file, &data->read_wait, wait);
1060
1061 mutex_lock(&data->mtx);
1062 if (!list_empty(&data->events))
1063 res = POLLIN | POLLRDNORM;
1064 mutex_unlock(&data->mtx);
1065
1066 return res;
1067}
1068
1069static bool rfkill_readable(struct rfkill_data *data)
1070{
1071 bool r;
1072
1073 mutex_lock(&data->mtx);
1074 r = !list_empty(&data->events);
1075 mutex_unlock(&data->mtx);
1076
1077 return r;
1078}
1079
1080static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1081 size_t count, loff_t *pos)
1082{
1083 struct rfkill_data *data = file->private_data;
1084 struct rfkill_int_event *ev;
1085 unsigned long sz;
1086 int ret;
1087
1088 mutex_lock(&data->mtx);
1089
1090 while (list_empty(&data->events)) {
1091 if (file->f_flags & O_NONBLOCK) {
1092 ret = -EAGAIN;
1093 goto out;
1094 }
1095 mutex_unlock(&data->mtx);
1096 ret = wait_event_interruptible(data->read_wait,
1097 rfkill_readable(data));
1098 mutex_lock(&data->mtx);
1099
1100 if (ret)
1101 goto out;
1102 }
1103
1104 ev = list_first_entry(&data->events, struct rfkill_int_event,
1105 list);
1106
1107 sz = min_t(unsigned long, sizeof(ev->ev), count);
1108 ret = sz;
1109 if (copy_to_user(buf, &ev->ev, sz))
1110 ret = -EFAULT;
1111
1112 list_del(&ev->list);
1113 kfree(ev);
1114 out:
1115 mutex_unlock(&data->mtx);
1116 return ret;
1117}
1118
1119static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1120 size_t count, loff_t *pos)
1121{
1122 struct rfkill *rfkill;
1123 struct rfkill_event ev;
1124
1125 /* we don't need the 'hard' variable but accept it */
1126 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1127 return -EINVAL;
1128
1129 /*
1130 * Copy as much data as we can accept into our 'ev' buffer,
1131 * but tell userspace how much we've copied so it can determine
1132 * our API version even in a write() call, if it cares.
1133 */
1134 count = min(count, sizeof(ev));
1135 if (copy_from_user(&ev, buf, count))
1136 return -EFAULT;
1137
1138 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1139 return -EINVAL;
1140
1141 if (ev.type >= NUM_RFKILL_TYPES)
1142 return -EINVAL;
1143
1144 mutex_lock(&rfkill_global_mutex);
1145
1146 if (ev.op == RFKILL_OP_CHANGE_ALL) {
1147 if (ev.type == RFKILL_TYPE_ALL) {
1148 enum rfkill_type i;
1149 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1150 rfkill_global_states[i].cur = ev.soft;
1151 } else {
1152 rfkill_global_states[ev.type].cur = ev.soft;
1153 }
1154 }
1155
1156 list_for_each_entry(rfkill, &rfkill_list, node) {
1157 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1158 continue;
1159
1160 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1161 continue;
1162
1163 rfkill_set_block(rfkill, ev.soft);
1164 }
1165 mutex_unlock(&rfkill_global_mutex);
1166
1167 return count;
1168}
1169
1170static int rfkill_fop_release(struct inode *inode, struct file *file)
1171{
1172 struct rfkill_data *data = file->private_data;
1173 struct rfkill_int_event *ev, *tmp;
1174
1175 mutex_lock(&rfkill_global_mutex);
1176 list_del(&data->list);
1177 mutex_unlock(&rfkill_global_mutex);
1178
1179 mutex_destroy(&data->mtx);
1180 list_for_each_entry_safe(ev, tmp, &data->events, list)
1181 kfree(ev);
1182
1183#ifdef CONFIG_RFKILL_INPUT
1184 if (data->input_handler)
1185 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1186 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1187#endif
1188
1189 kfree(data);
1190
1191 return 0;
1192}
1193
1194#ifdef CONFIG_RFKILL_INPUT
1195static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1196 unsigned long arg)
1197{
1198 struct rfkill_data *data = file->private_data;
1199
1200 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1201 return -ENOSYS;
1202
1203 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1204 return -ENOSYS;
1205
1206 mutex_lock(&data->mtx);
1207
1208 if (!data->input_handler) {
1209 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1210 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1211 data->input_handler = true;
1212 }
1213
1214 mutex_unlock(&data->mtx);
1215
1216 return 0;
1217}
1218#endif
1219
1220static const struct file_operations rfkill_fops = {
1221 .owner = THIS_MODULE,
1222 .open = rfkill_fop_open,
1223 .read = rfkill_fop_read,
1224 .write = rfkill_fop_write,
1225 .poll = rfkill_fop_poll,
1226 .release = rfkill_fop_release,
1227#ifdef CONFIG_RFKILL_INPUT
1228 .unlocked_ioctl = rfkill_fop_ioctl,
1229 .compat_ioctl = rfkill_fop_ioctl,
1230#endif
1231 .llseek = no_llseek,
1232};
1233
1234static struct miscdevice rfkill_miscdev = {
1235 .name = "rfkill",
1236 .fops = &rfkill_fops,
1237 .minor = MISC_DYNAMIC_MINOR,
1238};
1239
1240static int __init rfkill_init(void)
1241{
1242 int error;
1243 int i;
1244
1245 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1246 rfkill_global_states[i].cur = !rfkill_default_state;
1247
1248 error = class_register(&rfkill_class);
1249 if (error)
1250 goto out;
1251
1252 error = misc_register(&rfkill_miscdev);
1253 if (error) {
1254 class_unregister(&rfkill_class);
1255 goto out;
1256 }
1257
1258#ifdef CONFIG_RFKILL_INPUT
1259 error = rfkill_handler_init();
1260 if (error) {
1261 misc_deregister(&rfkill_miscdev);
1262 class_unregister(&rfkill_class);
1263 goto out;
1264 }
1265#endif
1266
1267 out:
1268 return error;
1269}
1270subsys_initcall(rfkill_init);
1271
1272static void __exit rfkill_exit(void)
1273{
1274#ifdef CONFIG_RFKILL_INPUT
1275 rfkill_handler_exit();
1276#endif
1277 misc_deregister(&rfkill_miscdev);
1278 class_unregister(&rfkill_class);
1279}
1280module_exit(rfkill_exit);