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