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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2006 - 2007 Ivo van Doorn
4 * Copyright (C) 2007 Dmitry Torokhov
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
6 */
7
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/workqueue.h>
12#include <linux/capability.h>
13#include <linux/list.h>
14#include <linux/mutex.h>
15#include <linux/rfkill.h>
16#include <linux/sched.h>
17#include <linux/spinlock.h>
18#include <linux/device.h>
19#include <linux/miscdevice.h>
20#include <linux/wait.h>
21#include <linux/poll.h>
22#include <linux/fs.h>
23#include <linux/slab.h>
24
25#include "rfkill.h"
26
27#define POLL_INTERVAL (5 * HZ)
28
29#define RFKILL_BLOCK_HW BIT(0)
30#define RFKILL_BLOCK_SW BIT(1)
31#define RFKILL_BLOCK_SW_PREV BIT(2)
32#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
33 RFKILL_BLOCK_SW |\
34 RFKILL_BLOCK_SW_PREV)
35#define RFKILL_BLOCK_SW_SETCALL BIT(31)
36
37struct rfkill {
38 spinlock_t lock;
39
40 enum rfkill_type type;
41
42 unsigned long state;
43 unsigned long hard_block_reasons;
44
45 u32 idx;
46
47 bool registered;
48 bool persistent;
49 bool polling_paused;
50 bool suspended;
51 bool need_sync;
52
53 const struct rfkill_ops *ops;
54 void *data;
55
56#ifdef CONFIG_RFKILL_LEDS
57 struct led_trigger led_trigger;
58 const char *ledtrigname;
59#endif
60
61 struct device dev;
62 struct list_head node;
63
64 struct delayed_work poll_work;
65 struct work_struct uevent_work;
66 struct work_struct sync_work;
67 char name[];
68};
69#define to_rfkill(d) container_of(d, struct rfkill, dev)
70
71struct rfkill_int_event {
72 struct list_head list;
73 struct rfkill_event_ext ev;
74};
75
76struct rfkill_data {
77 struct list_head list;
78 struct list_head events;
79 struct mutex mtx;
80 wait_queue_head_t read_wait;
81 bool input_handler;
82 u8 max_size;
83};
84
85
86MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
87MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
88MODULE_DESCRIPTION("RF switch support");
89MODULE_LICENSE("GPL");
90
91
92/*
93 * The locking here should be made much smarter, we currently have
94 * a bit of a stupid situation because drivers might want to register
95 * the rfkill struct under their own lock, and take this lock during
96 * rfkill method calls -- which will cause an AB-BA deadlock situation.
97 *
98 * To fix that, we need to rework this code here to be mostly lock-free
99 * and only use the mutex for list manipulations, not to protect the
100 * various other global variables. Then we can avoid holding the mutex
101 * around driver operations, and all is happy.
102 */
103static LIST_HEAD(rfkill_list); /* list of registered rf switches */
104static DEFINE_MUTEX(rfkill_global_mutex);
105static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
106
107static unsigned int rfkill_default_state = 1;
108module_param_named(default_state, rfkill_default_state, uint, 0444);
109MODULE_PARM_DESC(default_state,
110 "Default initial state for all radio types, 0 = radio off");
111
112static struct {
113 bool cur, sav;
114} rfkill_global_states[NUM_RFKILL_TYPES];
115
116static bool rfkill_epo_lock_active;
117
118
119#ifdef CONFIG_RFKILL_LEDS
120static void rfkill_led_trigger_event(struct rfkill *rfkill)
121{
122 struct led_trigger *trigger;
123
124 if (!rfkill->registered)
125 return;
126
127 trigger = &rfkill->led_trigger;
128
129 if (rfkill->state & RFKILL_BLOCK_ANY)
130 led_trigger_event(trigger, LED_OFF);
131 else
132 led_trigger_event(trigger, LED_FULL);
133}
134
135static int rfkill_led_trigger_activate(struct led_classdev *led)
136{
137 struct rfkill *rfkill;
138
139 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
140
141 rfkill_led_trigger_event(rfkill);
142
143 return 0;
144}
145
146const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
147{
148 return rfkill->led_trigger.name;
149}
150EXPORT_SYMBOL(rfkill_get_led_trigger_name);
151
152void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
153{
154 BUG_ON(!rfkill);
155
156 rfkill->ledtrigname = name;
157}
158EXPORT_SYMBOL(rfkill_set_led_trigger_name);
159
160static int rfkill_led_trigger_register(struct rfkill *rfkill)
161{
162 rfkill->led_trigger.name = rfkill->ledtrigname
163 ? : dev_name(&rfkill->dev);
164 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
165 return led_trigger_register(&rfkill->led_trigger);
166}
167
168static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
169{
170 led_trigger_unregister(&rfkill->led_trigger);
171}
172
173static struct led_trigger rfkill_any_led_trigger;
174static struct led_trigger rfkill_none_led_trigger;
175static struct work_struct rfkill_global_led_trigger_work;
176
177static void rfkill_global_led_trigger_worker(struct work_struct *work)
178{
179 enum led_brightness brightness = LED_OFF;
180 struct rfkill *rfkill;
181
182 mutex_lock(&rfkill_global_mutex);
183 list_for_each_entry(rfkill, &rfkill_list, node) {
184 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
185 brightness = LED_FULL;
186 break;
187 }
188 }
189 mutex_unlock(&rfkill_global_mutex);
190
191 led_trigger_event(&rfkill_any_led_trigger, brightness);
192 led_trigger_event(&rfkill_none_led_trigger,
193 brightness == LED_OFF ? LED_FULL : LED_OFF);
194}
195
196static void rfkill_global_led_trigger_event(void)
197{
198 schedule_work(&rfkill_global_led_trigger_work);
199}
200
201static int rfkill_global_led_trigger_register(void)
202{
203 int ret;
204
205 INIT_WORK(&rfkill_global_led_trigger_work,
206 rfkill_global_led_trigger_worker);
207
208 rfkill_any_led_trigger.name = "rfkill-any";
209 ret = led_trigger_register(&rfkill_any_led_trigger);
210 if (ret)
211 return ret;
212
213 rfkill_none_led_trigger.name = "rfkill-none";
214 ret = led_trigger_register(&rfkill_none_led_trigger);
215 if (ret)
216 led_trigger_unregister(&rfkill_any_led_trigger);
217 else
218 /* Delay activation until all global triggers are registered */
219 rfkill_global_led_trigger_event();
220
221 return ret;
222}
223
224static void rfkill_global_led_trigger_unregister(void)
225{
226 led_trigger_unregister(&rfkill_none_led_trigger);
227 led_trigger_unregister(&rfkill_any_led_trigger);
228 cancel_work_sync(&rfkill_global_led_trigger_work);
229}
230#else
231static void rfkill_led_trigger_event(struct rfkill *rfkill)
232{
233}
234
235static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
236{
237 return 0;
238}
239
240static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
241{
242}
243
244static void rfkill_global_led_trigger_event(void)
245{
246}
247
248static int rfkill_global_led_trigger_register(void)
249{
250 return 0;
251}
252
253static void rfkill_global_led_trigger_unregister(void)
254{
255}
256#endif /* CONFIG_RFKILL_LEDS */
257
258static void rfkill_fill_event(struct rfkill_event_ext *ev,
259 struct rfkill *rfkill,
260 enum rfkill_operation op)
261{
262 unsigned long flags;
263
264 ev->idx = rfkill->idx;
265 ev->type = rfkill->type;
266 ev->op = op;
267
268 spin_lock_irqsave(&rfkill->lock, flags);
269 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
270 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
271 RFKILL_BLOCK_SW_PREV));
272 ev->hard_block_reasons = rfkill->hard_block_reasons;
273 spin_unlock_irqrestore(&rfkill->lock, flags);
274}
275
276static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
277{
278 struct rfkill_data *data;
279 struct rfkill_int_event *ev;
280
281 list_for_each_entry(data, &rfkill_fds, list) {
282 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
283 if (!ev)
284 continue;
285 rfkill_fill_event(&ev->ev, rfkill, op);
286 mutex_lock(&data->mtx);
287 list_add_tail(&ev->list, &data->events);
288 mutex_unlock(&data->mtx);
289 wake_up_interruptible(&data->read_wait);
290 }
291}
292
293static void rfkill_event(struct rfkill *rfkill)
294{
295 if (!rfkill->registered)
296 return;
297
298 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
299
300 /* also send event to /dev/rfkill */
301 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
302}
303
304/**
305 * rfkill_set_block - wrapper for set_block method
306 *
307 * @rfkill: the rfkill struct to use
308 * @blocked: the new software state
309 *
310 * Calls the set_block method (when applicable) and handles notifications
311 * etc. as well.
312 */
313static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
314{
315 unsigned long flags;
316 bool prev, curr;
317 int err;
318
319 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
320 return;
321
322 /*
323 * Some platforms (...!) generate input events which affect the
324 * _hard_ kill state -- whenever something tries to change the
325 * current software state query the hardware state too.
326 */
327 if (rfkill->ops->query)
328 rfkill->ops->query(rfkill, rfkill->data);
329
330 spin_lock_irqsave(&rfkill->lock, flags);
331 prev = rfkill->state & RFKILL_BLOCK_SW;
332
333 if (prev)
334 rfkill->state |= RFKILL_BLOCK_SW_PREV;
335 else
336 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
337
338 if (blocked)
339 rfkill->state |= RFKILL_BLOCK_SW;
340 else
341 rfkill->state &= ~RFKILL_BLOCK_SW;
342
343 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
344 spin_unlock_irqrestore(&rfkill->lock, flags);
345
346 err = rfkill->ops->set_block(rfkill->data, blocked);
347
348 spin_lock_irqsave(&rfkill->lock, flags);
349 if (err) {
350 /*
351 * Failed -- reset status to _PREV, which may be different
352 * from what we have set _PREV to earlier in this function
353 * if rfkill_set_sw_state was invoked.
354 */
355 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
356 rfkill->state |= RFKILL_BLOCK_SW;
357 else
358 rfkill->state &= ~RFKILL_BLOCK_SW;
359 }
360 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
361 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
362 curr = rfkill->state & RFKILL_BLOCK_SW;
363 spin_unlock_irqrestore(&rfkill->lock, flags);
364
365 rfkill_led_trigger_event(rfkill);
366 rfkill_global_led_trigger_event();
367
368 if (prev != curr)
369 rfkill_event(rfkill);
370}
371
372static void rfkill_sync(struct rfkill *rfkill)
373{
374 lockdep_assert_held(&rfkill_global_mutex);
375
376 if (!rfkill->need_sync)
377 return;
378
379 rfkill_set_block(rfkill, rfkill_global_states[rfkill->type].cur);
380 rfkill->need_sync = false;
381}
382
383static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
384{
385 int i;
386
387 if (type != RFKILL_TYPE_ALL) {
388 rfkill_global_states[type].cur = blocked;
389 return;
390 }
391
392 for (i = 0; i < NUM_RFKILL_TYPES; i++)
393 rfkill_global_states[i].cur = blocked;
394}
395
396#ifdef CONFIG_RFKILL_INPUT
397static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
398
399/**
400 * __rfkill_switch_all - Toggle state of all switches of given type
401 * @type: type of interfaces to be affected
402 * @blocked: the new state
403 *
404 * This function sets the state of all switches of given type,
405 * unless a specific switch is suspended.
406 *
407 * Caller must have acquired rfkill_global_mutex.
408 */
409static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
410{
411 struct rfkill *rfkill;
412
413 rfkill_update_global_state(type, blocked);
414 list_for_each_entry(rfkill, &rfkill_list, node) {
415 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
416 continue;
417
418 rfkill_set_block(rfkill, blocked);
419 }
420}
421
422/**
423 * rfkill_switch_all - Toggle state of all switches of given type
424 * @type: type of interfaces to be affected
425 * @blocked: the new state
426 *
427 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
428 * Please refer to __rfkill_switch_all() for details.
429 *
430 * Does nothing if the EPO lock is active.
431 */
432void rfkill_switch_all(enum rfkill_type type, bool blocked)
433{
434 if (atomic_read(&rfkill_input_disabled))
435 return;
436
437 mutex_lock(&rfkill_global_mutex);
438
439 if (!rfkill_epo_lock_active)
440 __rfkill_switch_all(type, blocked);
441
442 mutex_unlock(&rfkill_global_mutex);
443}
444
445/**
446 * rfkill_epo - emergency power off all transmitters
447 *
448 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
449 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
450 *
451 * The global state before the EPO is saved and can be restored later
452 * using rfkill_restore_states().
453 */
454void rfkill_epo(void)
455{
456 struct rfkill *rfkill;
457 int i;
458
459 if (atomic_read(&rfkill_input_disabled))
460 return;
461
462 mutex_lock(&rfkill_global_mutex);
463
464 rfkill_epo_lock_active = true;
465 list_for_each_entry(rfkill, &rfkill_list, node)
466 rfkill_set_block(rfkill, true);
467
468 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
469 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
470 rfkill_global_states[i].cur = true;
471 }
472
473 mutex_unlock(&rfkill_global_mutex);
474}
475
476/**
477 * rfkill_restore_states - restore global states
478 *
479 * Restore (and sync switches to) the global state from the
480 * states in rfkill_default_states. This can undo the effects of
481 * a call to rfkill_epo().
482 */
483void rfkill_restore_states(void)
484{
485 int i;
486
487 if (atomic_read(&rfkill_input_disabled))
488 return;
489
490 mutex_lock(&rfkill_global_mutex);
491
492 rfkill_epo_lock_active = false;
493 for (i = 0; i < NUM_RFKILL_TYPES; i++)
494 __rfkill_switch_all(i, rfkill_global_states[i].sav);
495 mutex_unlock(&rfkill_global_mutex);
496}
497
498/**
499 * rfkill_remove_epo_lock - unlock state changes
500 *
501 * Used by rfkill-input manually unlock state changes, when
502 * the EPO switch is deactivated.
503 */
504void rfkill_remove_epo_lock(void)
505{
506 if (atomic_read(&rfkill_input_disabled))
507 return;
508
509 mutex_lock(&rfkill_global_mutex);
510 rfkill_epo_lock_active = false;
511 mutex_unlock(&rfkill_global_mutex);
512}
513
514/**
515 * rfkill_is_epo_lock_active - returns true EPO is active
516 *
517 * Returns 0 (false) if there is NOT an active EPO condition,
518 * and 1 (true) if there is an active EPO condition, which
519 * locks all radios in one of the BLOCKED states.
520 *
521 * Can be called in atomic context.
522 */
523bool rfkill_is_epo_lock_active(void)
524{
525 return rfkill_epo_lock_active;
526}
527
528/**
529 * rfkill_get_global_sw_state - returns global state for a type
530 * @type: the type to get the global state of
531 *
532 * Returns the current global state for a given wireless
533 * device type.
534 */
535bool rfkill_get_global_sw_state(const enum rfkill_type type)
536{
537 return rfkill_global_states[type].cur;
538}
539#endif
540
541bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
542 bool blocked, unsigned long reason)
543{
544 unsigned long flags;
545 bool ret, prev;
546
547 BUG_ON(!rfkill);
548
549 if (WARN(reason &
550 ~(RFKILL_HARD_BLOCK_SIGNAL | RFKILL_HARD_BLOCK_NOT_OWNER),
551 "hw_state reason not supported: 0x%lx", reason))
552 return blocked;
553
554 spin_lock_irqsave(&rfkill->lock, flags);
555 prev = !!(rfkill->hard_block_reasons & reason);
556 if (blocked) {
557 rfkill->state |= RFKILL_BLOCK_HW;
558 rfkill->hard_block_reasons |= reason;
559 } else {
560 rfkill->hard_block_reasons &= ~reason;
561 if (!rfkill->hard_block_reasons)
562 rfkill->state &= ~RFKILL_BLOCK_HW;
563 }
564 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
565 spin_unlock_irqrestore(&rfkill->lock, flags);
566
567 rfkill_led_trigger_event(rfkill);
568 rfkill_global_led_trigger_event();
569
570 if (rfkill->registered && prev != blocked)
571 schedule_work(&rfkill->uevent_work);
572
573 return ret;
574}
575EXPORT_SYMBOL(rfkill_set_hw_state_reason);
576
577static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
578{
579 u32 bit = RFKILL_BLOCK_SW;
580
581 /* if in a ops->set_block right now, use other bit */
582 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
583 bit = RFKILL_BLOCK_SW_PREV;
584
585 if (blocked)
586 rfkill->state |= bit;
587 else
588 rfkill->state &= ~bit;
589}
590
591bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
592{
593 unsigned long flags;
594 bool prev, hwblock;
595
596 BUG_ON(!rfkill);
597
598 spin_lock_irqsave(&rfkill->lock, flags);
599 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
600 __rfkill_set_sw_state(rfkill, blocked);
601 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
602 blocked = blocked || hwblock;
603 spin_unlock_irqrestore(&rfkill->lock, flags);
604
605 if (!rfkill->registered)
606 return blocked;
607
608 if (prev != blocked && !hwblock)
609 schedule_work(&rfkill->uevent_work);
610
611 rfkill_led_trigger_event(rfkill);
612 rfkill_global_led_trigger_event();
613
614 return blocked;
615}
616EXPORT_SYMBOL(rfkill_set_sw_state);
617
618void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
619{
620 unsigned long flags;
621
622 BUG_ON(!rfkill);
623 BUG_ON(rfkill->registered);
624
625 spin_lock_irqsave(&rfkill->lock, flags);
626 __rfkill_set_sw_state(rfkill, blocked);
627 rfkill->persistent = true;
628 spin_unlock_irqrestore(&rfkill->lock, flags);
629}
630EXPORT_SYMBOL(rfkill_init_sw_state);
631
632void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
633{
634 unsigned long flags;
635 bool swprev, hwprev;
636
637 BUG_ON(!rfkill);
638
639 spin_lock_irqsave(&rfkill->lock, flags);
640
641 /*
642 * No need to care about prev/setblock ... this is for uevent only
643 * and that will get triggered by rfkill_set_block anyway.
644 */
645 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
646 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
647 __rfkill_set_sw_state(rfkill, sw);
648 if (hw)
649 rfkill->state |= RFKILL_BLOCK_HW;
650 else
651 rfkill->state &= ~RFKILL_BLOCK_HW;
652
653 spin_unlock_irqrestore(&rfkill->lock, flags);
654
655 if (!rfkill->registered) {
656 rfkill->persistent = true;
657 } else {
658 if (swprev != sw || hwprev != hw)
659 schedule_work(&rfkill->uevent_work);
660
661 rfkill_led_trigger_event(rfkill);
662 rfkill_global_led_trigger_event();
663 }
664}
665EXPORT_SYMBOL(rfkill_set_states);
666
667static const char * const rfkill_types[] = {
668 NULL, /* RFKILL_TYPE_ALL */
669 "wlan",
670 "bluetooth",
671 "ultrawideband",
672 "wimax",
673 "wwan",
674 "gps",
675 "fm",
676 "nfc",
677};
678
679enum rfkill_type rfkill_find_type(const char *name)
680{
681 int i;
682
683 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
684
685 if (!name)
686 return RFKILL_TYPE_ALL;
687
688 for (i = 1; i < NUM_RFKILL_TYPES; i++)
689 if (!strcmp(name, rfkill_types[i]))
690 return i;
691 return RFKILL_TYPE_ALL;
692}
693EXPORT_SYMBOL(rfkill_find_type);
694
695static ssize_t name_show(struct device *dev, struct device_attribute *attr,
696 char *buf)
697{
698 struct rfkill *rfkill = to_rfkill(dev);
699
700 return sysfs_emit(buf, "%s\n", rfkill->name);
701}
702static DEVICE_ATTR_RO(name);
703
704static ssize_t type_show(struct device *dev, struct device_attribute *attr,
705 char *buf)
706{
707 struct rfkill *rfkill = to_rfkill(dev);
708
709 return sysfs_emit(buf, "%s\n", rfkill_types[rfkill->type]);
710}
711static DEVICE_ATTR_RO(type);
712
713static ssize_t index_show(struct device *dev, struct device_attribute *attr,
714 char *buf)
715{
716 struct rfkill *rfkill = to_rfkill(dev);
717
718 return sysfs_emit(buf, "%d\n", rfkill->idx);
719}
720static DEVICE_ATTR_RO(index);
721
722static ssize_t persistent_show(struct device *dev,
723 struct device_attribute *attr, char *buf)
724{
725 struct rfkill *rfkill = to_rfkill(dev);
726
727 return sysfs_emit(buf, "%d\n", rfkill->persistent);
728}
729static DEVICE_ATTR_RO(persistent);
730
731static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
732 char *buf)
733{
734 struct rfkill *rfkill = to_rfkill(dev);
735
736 return sysfs_emit(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0);
737}
738static DEVICE_ATTR_RO(hard);
739
740static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
741 char *buf)
742{
743 struct rfkill *rfkill = to_rfkill(dev);
744
745 mutex_lock(&rfkill_global_mutex);
746 rfkill_sync(rfkill);
747 mutex_unlock(&rfkill_global_mutex);
748
749 return sysfs_emit(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0);
750}
751
752static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
753 const char *buf, size_t count)
754{
755 struct rfkill *rfkill = to_rfkill(dev);
756 unsigned long state;
757 int err;
758
759 if (!capable(CAP_NET_ADMIN))
760 return -EPERM;
761
762 err = kstrtoul(buf, 0, &state);
763 if (err)
764 return err;
765
766 if (state > 1 )
767 return -EINVAL;
768
769 mutex_lock(&rfkill_global_mutex);
770 rfkill_sync(rfkill);
771 rfkill_set_block(rfkill, state);
772 mutex_unlock(&rfkill_global_mutex);
773
774 return count;
775}
776static DEVICE_ATTR_RW(soft);
777
778static ssize_t hard_block_reasons_show(struct device *dev,
779 struct device_attribute *attr,
780 char *buf)
781{
782 struct rfkill *rfkill = to_rfkill(dev);
783
784 return sysfs_emit(buf, "0x%lx\n", rfkill->hard_block_reasons);
785}
786static DEVICE_ATTR_RO(hard_block_reasons);
787
788static u8 user_state_from_blocked(unsigned long state)
789{
790 if (state & RFKILL_BLOCK_HW)
791 return RFKILL_USER_STATE_HARD_BLOCKED;
792 if (state & RFKILL_BLOCK_SW)
793 return RFKILL_USER_STATE_SOFT_BLOCKED;
794
795 return RFKILL_USER_STATE_UNBLOCKED;
796}
797
798static ssize_t state_show(struct device *dev, struct device_attribute *attr,
799 char *buf)
800{
801 struct rfkill *rfkill = to_rfkill(dev);
802
803 mutex_lock(&rfkill_global_mutex);
804 rfkill_sync(rfkill);
805 mutex_unlock(&rfkill_global_mutex);
806
807 return sysfs_emit(buf, "%d\n", user_state_from_blocked(rfkill->state));
808}
809
810static ssize_t state_store(struct device *dev, struct device_attribute *attr,
811 const char *buf, size_t count)
812{
813 struct rfkill *rfkill = to_rfkill(dev);
814 unsigned long state;
815 int err;
816
817 if (!capable(CAP_NET_ADMIN))
818 return -EPERM;
819
820 err = kstrtoul(buf, 0, &state);
821 if (err)
822 return err;
823
824 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
825 state != RFKILL_USER_STATE_UNBLOCKED)
826 return -EINVAL;
827
828 mutex_lock(&rfkill_global_mutex);
829 rfkill_sync(rfkill);
830 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
831 mutex_unlock(&rfkill_global_mutex);
832
833 return count;
834}
835static DEVICE_ATTR_RW(state);
836
837static struct attribute *rfkill_dev_attrs[] = {
838 &dev_attr_name.attr,
839 &dev_attr_type.attr,
840 &dev_attr_index.attr,
841 &dev_attr_persistent.attr,
842 &dev_attr_state.attr,
843 &dev_attr_soft.attr,
844 &dev_attr_hard.attr,
845 &dev_attr_hard_block_reasons.attr,
846 NULL,
847};
848ATTRIBUTE_GROUPS(rfkill_dev);
849
850static void rfkill_release(struct device *dev)
851{
852 struct rfkill *rfkill = to_rfkill(dev);
853
854 kfree(rfkill);
855}
856
857static int rfkill_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
858{
859 struct rfkill *rfkill = to_rfkill(dev);
860 unsigned long flags;
861 unsigned long reasons;
862 u32 state;
863 int error;
864
865 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
866 if (error)
867 return error;
868 error = add_uevent_var(env, "RFKILL_TYPE=%s",
869 rfkill_types[rfkill->type]);
870 if (error)
871 return error;
872 spin_lock_irqsave(&rfkill->lock, flags);
873 state = rfkill->state;
874 reasons = rfkill->hard_block_reasons;
875 spin_unlock_irqrestore(&rfkill->lock, flags);
876 error = add_uevent_var(env, "RFKILL_STATE=%d",
877 user_state_from_blocked(state));
878 if (error)
879 return error;
880 return add_uevent_var(env, "RFKILL_HW_BLOCK_REASON=0x%lx", reasons);
881}
882
883void rfkill_pause_polling(struct rfkill *rfkill)
884{
885 BUG_ON(!rfkill);
886
887 if (!rfkill->ops->poll)
888 return;
889
890 rfkill->polling_paused = true;
891 cancel_delayed_work_sync(&rfkill->poll_work);
892}
893EXPORT_SYMBOL(rfkill_pause_polling);
894
895void rfkill_resume_polling(struct rfkill *rfkill)
896{
897 BUG_ON(!rfkill);
898
899 if (!rfkill->ops->poll)
900 return;
901
902 rfkill->polling_paused = false;
903
904 if (rfkill->suspended)
905 return;
906
907 queue_delayed_work(system_power_efficient_wq,
908 &rfkill->poll_work, 0);
909}
910EXPORT_SYMBOL(rfkill_resume_polling);
911
912#ifdef CONFIG_PM_SLEEP
913static int rfkill_suspend(struct device *dev)
914{
915 struct rfkill *rfkill = to_rfkill(dev);
916
917 rfkill->suspended = true;
918 cancel_delayed_work_sync(&rfkill->poll_work);
919
920 return 0;
921}
922
923static int rfkill_resume(struct device *dev)
924{
925 struct rfkill *rfkill = to_rfkill(dev);
926 bool cur;
927
928 rfkill->suspended = false;
929
930 if (!rfkill->registered)
931 return 0;
932
933 if (!rfkill->persistent) {
934 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
935 rfkill_set_block(rfkill, cur);
936 }
937
938 if (rfkill->ops->poll && !rfkill->polling_paused)
939 queue_delayed_work(system_power_efficient_wq,
940 &rfkill->poll_work, 0);
941
942 return 0;
943}
944
945static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
946#define RFKILL_PM_OPS (&rfkill_pm_ops)
947#else
948#define RFKILL_PM_OPS NULL
949#endif
950
951static struct class rfkill_class = {
952 .name = "rfkill",
953 .dev_release = rfkill_release,
954 .dev_groups = rfkill_dev_groups,
955 .dev_uevent = rfkill_dev_uevent,
956 .pm = RFKILL_PM_OPS,
957};
958
959bool rfkill_blocked(struct rfkill *rfkill)
960{
961 unsigned long flags;
962 u32 state;
963
964 spin_lock_irqsave(&rfkill->lock, flags);
965 state = rfkill->state;
966 spin_unlock_irqrestore(&rfkill->lock, flags);
967
968 return !!(state & RFKILL_BLOCK_ANY);
969}
970EXPORT_SYMBOL(rfkill_blocked);
971
972bool rfkill_soft_blocked(struct rfkill *rfkill)
973{
974 unsigned long flags;
975 u32 state;
976
977 spin_lock_irqsave(&rfkill->lock, flags);
978 state = rfkill->state;
979 spin_unlock_irqrestore(&rfkill->lock, flags);
980
981 return !!(state & RFKILL_BLOCK_SW);
982}
983EXPORT_SYMBOL(rfkill_soft_blocked);
984
985struct rfkill * __must_check rfkill_alloc(const char *name,
986 struct device *parent,
987 const enum rfkill_type type,
988 const struct rfkill_ops *ops,
989 void *ops_data)
990{
991 struct rfkill *rfkill;
992 struct device *dev;
993
994 if (WARN_ON(!ops))
995 return NULL;
996
997 if (WARN_ON(!ops->set_block))
998 return NULL;
999
1000 if (WARN_ON(!name))
1001 return NULL;
1002
1003 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
1004 return NULL;
1005
1006 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
1007 if (!rfkill)
1008 return NULL;
1009
1010 spin_lock_init(&rfkill->lock);
1011 INIT_LIST_HEAD(&rfkill->node);
1012 rfkill->type = type;
1013 strcpy(rfkill->name, name);
1014 rfkill->ops = ops;
1015 rfkill->data = ops_data;
1016
1017 dev = &rfkill->dev;
1018 dev->class = &rfkill_class;
1019 dev->parent = parent;
1020 device_initialize(dev);
1021
1022 return rfkill;
1023}
1024EXPORT_SYMBOL(rfkill_alloc);
1025
1026static void rfkill_poll(struct work_struct *work)
1027{
1028 struct rfkill *rfkill;
1029
1030 rfkill = container_of(work, struct rfkill, poll_work.work);
1031
1032 /*
1033 * Poll hardware state -- driver will use one of the
1034 * rfkill_set{,_hw,_sw}_state functions and use its
1035 * return value to update the current status.
1036 */
1037 rfkill->ops->poll(rfkill, rfkill->data);
1038
1039 queue_delayed_work(system_power_efficient_wq,
1040 &rfkill->poll_work,
1041 round_jiffies_relative(POLL_INTERVAL));
1042}
1043
1044static void rfkill_uevent_work(struct work_struct *work)
1045{
1046 struct rfkill *rfkill;
1047
1048 rfkill = container_of(work, struct rfkill, uevent_work);
1049
1050 mutex_lock(&rfkill_global_mutex);
1051 rfkill_event(rfkill);
1052 mutex_unlock(&rfkill_global_mutex);
1053}
1054
1055static void rfkill_sync_work(struct work_struct *work)
1056{
1057 struct rfkill *rfkill = container_of(work, struct rfkill, sync_work);
1058
1059 mutex_lock(&rfkill_global_mutex);
1060 rfkill_sync(rfkill);
1061 mutex_unlock(&rfkill_global_mutex);
1062}
1063
1064int __must_check rfkill_register(struct rfkill *rfkill)
1065{
1066 static unsigned long rfkill_no;
1067 struct device *dev;
1068 int error;
1069
1070 if (!rfkill)
1071 return -EINVAL;
1072
1073 dev = &rfkill->dev;
1074
1075 mutex_lock(&rfkill_global_mutex);
1076
1077 if (rfkill->registered) {
1078 error = -EALREADY;
1079 goto unlock;
1080 }
1081
1082 rfkill->idx = rfkill_no;
1083 dev_set_name(dev, "rfkill%lu", rfkill_no);
1084 rfkill_no++;
1085
1086 list_add_tail(&rfkill->node, &rfkill_list);
1087
1088 error = device_add(dev);
1089 if (error)
1090 goto remove;
1091
1092 error = rfkill_led_trigger_register(rfkill);
1093 if (error)
1094 goto devdel;
1095
1096 rfkill->registered = true;
1097
1098 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1099 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1100 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1101
1102 if (rfkill->ops->poll)
1103 queue_delayed_work(system_power_efficient_wq,
1104 &rfkill->poll_work,
1105 round_jiffies_relative(POLL_INTERVAL));
1106
1107 if (!rfkill->persistent || rfkill_epo_lock_active) {
1108 rfkill->need_sync = true;
1109 schedule_work(&rfkill->sync_work);
1110 } else {
1111#ifdef CONFIG_RFKILL_INPUT
1112 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1113
1114 if (!atomic_read(&rfkill_input_disabled))
1115 __rfkill_switch_all(rfkill->type, soft_blocked);
1116#endif
1117 }
1118
1119 rfkill_global_led_trigger_event();
1120 rfkill_send_events(rfkill, RFKILL_OP_ADD);
1121
1122 mutex_unlock(&rfkill_global_mutex);
1123 return 0;
1124
1125 devdel:
1126 device_del(&rfkill->dev);
1127 remove:
1128 list_del_init(&rfkill->node);
1129 unlock:
1130 mutex_unlock(&rfkill_global_mutex);
1131 return error;
1132}
1133EXPORT_SYMBOL(rfkill_register);
1134
1135void rfkill_unregister(struct rfkill *rfkill)
1136{
1137 BUG_ON(!rfkill);
1138
1139 if (rfkill->ops->poll)
1140 cancel_delayed_work_sync(&rfkill->poll_work);
1141
1142 cancel_work_sync(&rfkill->uevent_work);
1143 cancel_work_sync(&rfkill->sync_work);
1144
1145 rfkill->registered = false;
1146
1147 device_del(&rfkill->dev);
1148
1149 mutex_lock(&rfkill_global_mutex);
1150 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1151 list_del_init(&rfkill->node);
1152 rfkill_global_led_trigger_event();
1153 mutex_unlock(&rfkill_global_mutex);
1154
1155 rfkill_led_trigger_unregister(rfkill);
1156}
1157EXPORT_SYMBOL(rfkill_unregister);
1158
1159void rfkill_destroy(struct rfkill *rfkill)
1160{
1161 if (rfkill)
1162 put_device(&rfkill->dev);
1163}
1164EXPORT_SYMBOL(rfkill_destroy);
1165
1166static int rfkill_fop_open(struct inode *inode, struct file *file)
1167{
1168 struct rfkill_data *data;
1169 struct rfkill *rfkill;
1170 struct rfkill_int_event *ev, *tmp;
1171
1172 data = kzalloc(sizeof(*data), GFP_KERNEL);
1173 if (!data)
1174 return -ENOMEM;
1175
1176 data->max_size = RFKILL_EVENT_SIZE_V1;
1177
1178 INIT_LIST_HEAD(&data->events);
1179 mutex_init(&data->mtx);
1180 init_waitqueue_head(&data->read_wait);
1181
1182 mutex_lock(&rfkill_global_mutex);
1183 /*
1184 * start getting events from elsewhere but hold mtx to get
1185 * startup events added first
1186 */
1187
1188 list_for_each_entry(rfkill, &rfkill_list, node) {
1189 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1190 if (!ev)
1191 goto free;
1192 rfkill_sync(rfkill);
1193 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1194 mutex_lock(&data->mtx);
1195 list_add_tail(&ev->list, &data->events);
1196 mutex_unlock(&data->mtx);
1197 }
1198 list_add(&data->list, &rfkill_fds);
1199 mutex_unlock(&rfkill_global_mutex);
1200
1201 file->private_data = data;
1202
1203 return stream_open(inode, file);
1204
1205 free:
1206 mutex_unlock(&rfkill_global_mutex);
1207 mutex_destroy(&data->mtx);
1208 list_for_each_entry_safe(ev, tmp, &data->events, list)
1209 kfree(ev);
1210 kfree(data);
1211 return -ENOMEM;
1212}
1213
1214static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1215{
1216 struct rfkill_data *data = file->private_data;
1217 __poll_t res = EPOLLOUT | EPOLLWRNORM;
1218
1219 poll_wait(file, &data->read_wait, wait);
1220
1221 mutex_lock(&data->mtx);
1222 if (!list_empty(&data->events))
1223 res = EPOLLIN | EPOLLRDNORM;
1224 mutex_unlock(&data->mtx);
1225
1226 return res;
1227}
1228
1229static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1230 size_t count, loff_t *pos)
1231{
1232 struct rfkill_data *data = file->private_data;
1233 struct rfkill_int_event *ev;
1234 unsigned long sz;
1235 int ret;
1236
1237 mutex_lock(&data->mtx);
1238
1239 while (list_empty(&data->events)) {
1240 if (file->f_flags & O_NONBLOCK) {
1241 ret = -EAGAIN;
1242 goto out;
1243 }
1244 mutex_unlock(&data->mtx);
1245 /* since we re-check and it just compares pointers,
1246 * using !list_empty() without locking isn't a problem
1247 */
1248 ret = wait_event_interruptible(data->read_wait,
1249 !list_empty(&data->events));
1250 mutex_lock(&data->mtx);
1251
1252 if (ret)
1253 goto out;
1254 }
1255
1256 ev = list_first_entry(&data->events, struct rfkill_int_event,
1257 list);
1258
1259 sz = min_t(unsigned long, sizeof(ev->ev), count);
1260 sz = min_t(unsigned long, sz, data->max_size);
1261 ret = sz;
1262 if (copy_to_user(buf, &ev->ev, sz))
1263 ret = -EFAULT;
1264
1265 list_del(&ev->list);
1266 kfree(ev);
1267 out:
1268 mutex_unlock(&data->mtx);
1269 return ret;
1270}
1271
1272static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1273 size_t count, loff_t *pos)
1274{
1275 struct rfkill_data *data = file->private_data;
1276 struct rfkill *rfkill;
1277 struct rfkill_event_ext ev;
1278 int ret;
1279
1280 /* we don't need the 'hard' variable but accept it */
1281 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1282 return -EINVAL;
1283
1284 /*
1285 * Copy as much data as we can accept into our 'ev' buffer,
1286 * but tell userspace how much we've copied so it can determine
1287 * our API version even in a write() call, if it cares.
1288 */
1289 count = min(count, sizeof(ev));
1290 count = min_t(size_t, count, data->max_size);
1291 if (copy_from_user(&ev, buf, count))
1292 return -EFAULT;
1293
1294 if (ev.type >= NUM_RFKILL_TYPES)
1295 return -EINVAL;
1296
1297 mutex_lock(&rfkill_global_mutex);
1298
1299 switch (ev.op) {
1300 case RFKILL_OP_CHANGE_ALL:
1301 rfkill_update_global_state(ev.type, ev.soft);
1302 list_for_each_entry(rfkill, &rfkill_list, node)
1303 if (rfkill->type == ev.type ||
1304 ev.type == RFKILL_TYPE_ALL)
1305 rfkill_set_block(rfkill, ev.soft);
1306 ret = 0;
1307 break;
1308 case RFKILL_OP_CHANGE:
1309 list_for_each_entry(rfkill, &rfkill_list, node)
1310 if (rfkill->idx == ev.idx &&
1311 (rfkill->type == ev.type ||
1312 ev.type == RFKILL_TYPE_ALL))
1313 rfkill_set_block(rfkill, ev.soft);
1314 ret = 0;
1315 break;
1316 default:
1317 ret = -EINVAL;
1318 break;
1319 }
1320
1321 mutex_unlock(&rfkill_global_mutex);
1322
1323 return ret ?: count;
1324}
1325
1326static int rfkill_fop_release(struct inode *inode, struct file *file)
1327{
1328 struct rfkill_data *data = file->private_data;
1329 struct rfkill_int_event *ev, *tmp;
1330
1331 mutex_lock(&rfkill_global_mutex);
1332 list_del(&data->list);
1333 mutex_unlock(&rfkill_global_mutex);
1334
1335 mutex_destroy(&data->mtx);
1336 list_for_each_entry_safe(ev, tmp, &data->events, list)
1337 kfree(ev);
1338
1339#ifdef CONFIG_RFKILL_INPUT
1340 if (data->input_handler)
1341 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1342 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1343#endif
1344
1345 kfree(data);
1346
1347 return 0;
1348}
1349
1350static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1351 unsigned long arg)
1352{
1353 struct rfkill_data *data = file->private_data;
1354 int ret = -ENOTTY;
1355 u32 size;
1356
1357 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1358 return -ENOTTY;
1359
1360 mutex_lock(&data->mtx);
1361 switch (_IOC_NR(cmd)) {
1362#ifdef CONFIG_RFKILL_INPUT
1363 case RFKILL_IOC_NOINPUT:
1364 if (!data->input_handler) {
1365 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1366 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1367 data->input_handler = true;
1368 }
1369 ret = 0;
1370 break;
1371#endif
1372 case RFKILL_IOC_MAX_SIZE:
1373 if (get_user(size, (__u32 __user *)arg)) {
1374 ret = -EFAULT;
1375 break;
1376 }
1377 if (size < RFKILL_EVENT_SIZE_V1 || size > U8_MAX) {
1378 ret = -EINVAL;
1379 break;
1380 }
1381 data->max_size = size;
1382 ret = 0;
1383 break;
1384 default:
1385 break;
1386 }
1387 mutex_unlock(&data->mtx);
1388
1389 return ret;
1390}
1391
1392static const struct file_operations rfkill_fops = {
1393 .owner = THIS_MODULE,
1394 .open = rfkill_fop_open,
1395 .read = rfkill_fop_read,
1396 .write = rfkill_fop_write,
1397 .poll = rfkill_fop_poll,
1398 .release = rfkill_fop_release,
1399 .unlocked_ioctl = rfkill_fop_ioctl,
1400 .compat_ioctl = compat_ptr_ioctl,
1401 .llseek = no_llseek,
1402};
1403
1404#define RFKILL_NAME "rfkill"
1405
1406static struct miscdevice rfkill_miscdev = {
1407 .fops = &rfkill_fops,
1408 .name = RFKILL_NAME,
1409 .minor = RFKILL_MINOR,
1410};
1411
1412static int __init rfkill_init(void)
1413{
1414 int error;
1415
1416 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1417
1418 error = class_register(&rfkill_class);
1419 if (error)
1420 goto error_class;
1421
1422 error = misc_register(&rfkill_miscdev);
1423 if (error)
1424 goto error_misc;
1425
1426 error = rfkill_global_led_trigger_register();
1427 if (error)
1428 goto error_led_trigger;
1429
1430#ifdef CONFIG_RFKILL_INPUT
1431 error = rfkill_handler_init();
1432 if (error)
1433 goto error_input;
1434#endif
1435
1436 return 0;
1437
1438#ifdef CONFIG_RFKILL_INPUT
1439error_input:
1440 rfkill_global_led_trigger_unregister();
1441#endif
1442error_led_trigger:
1443 misc_deregister(&rfkill_miscdev);
1444error_misc:
1445 class_unregister(&rfkill_class);
1446error_class:
1447 return error;
1448}
1449subsys_initcall(rfkill_init);
1450
1451static void __exit rfkill_exit(void)
1452{
1453#ifdef CONFIG_RFKILL_INPUT
1454 rfkill_handler_exit();
1455#endif
1456 rfkill_global_led_trigger_unregister();
1457 misc_deregister(&rfkill_miscdev);
1458 class_unregister(&rfkill_class);
1459}
1460module_exit(rfkill_exit);
1461
1462MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1463MODULE_ALIAS("devname:" RFKILL_NAME);
1/*
2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, 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);