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