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