Linux 4.8.3
[linux/fpc-iii.git] / net / rfkill / core.c
blob884027f62783a6a975b42c0bdd5f39010df9834a
1 /*
2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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.
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.
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/>.
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>
37 #include "rfkill.h"
39 #define POLL_INTERVAL (5 * HZ)
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)
49 struct rfkill {
50 spinlock_t lock;
52 enum rfkill_type type;
54 unsigned long state;
56 u32 idx;
58 bool registered;
59 bool persistent;
60 bool polling_paused;
61 bool suspended;
63 const struct rfkill_ops *ops;
64 void *data;
66 #ifdef CONFIG_RFKILL_LEDS
67 struct led_trigger led_trigger;
68 const char *ledtrigname;
69 #endif
71 struct device dev;
72 struct list_head node;
74 struct delayed_work poll_work;
75 struct work_struct uevent_work;
76 struct work_struct sync_work;
77 char name[];
79 #define to_rfkill(d) container_of(d, struct rfkill, dev)
81 struct rfkill_int_event {
82 struct list_head list;
83 struct rfkill_event ev;
86 struct 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;
95 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
96 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
97 MODULE_DESCRIPTION("RF switch support");
98 MODULE_LICENSE("GPL");
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.
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.
112 static LIST_HEAD(rfkill_list); /* list of registered rf switches */
113 static DEFINE_MUTEX(rfkill_global_mutex);
114 static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
116 static unsigned int rfkill_default_state = 1;
117 module_param_named(default_state, rfkill_default_state, uint, 0444);
118 MODULE_PARM_DESC(default_state,
119 "Default initial state for all radio types, 0 = radio off");
121 static struct {
122 bool cur, sav;
123 } rfkill_global_states[NUM_RFKILL_TYPES];
125 static bool rfkill_epo_lock_active;
128 #ifdef CONFIG_RFKILL_LEDS
129 static void rfkill_led_trigger_event(struct rfkill *rfkill)
131 struct led_trigger *trigger;
133 if (!rfkill->registered)
134 return;
136 trigger = &rfkill->led_trigger;
138 if (rfkill->state & RFKILL_BLOCK_ANY)
139 led_trigger_event(trigger, LED_OFF);
140 else
141 led_trigger_event(trigger, LED_FULL);
144 static void rfkill_led_trigger_activate(struct led_classdev *led)
146 struct rfkill *rfkill;
148 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
150 rfkill_led_trigger_event(rfkill);
153 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
155 return rfkill->led_trigger.name;
157 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
159 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
161 BUG_ON(!rfkill);
163 rfkill->ledtrigname = name;
165 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
167 static int rfkill_led_trigger_register(struct rfkill *rfkill)
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);
175 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
177 led_trigger_unregister(&rfkill->led_trigger);
179 #else
180 static void rfkill_led_trigger_event(struct rfkill *rfkill)
184 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
186 return 0;
189 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
192 #endif /* CONFIG_RFKILL_LEDS */
194 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
195 enum rfkill_operation op)
197 unsigned long flags;
199 ev->idx = rfkill->idx;
200 ev->type = rfkill->type;
201 ev->op = op;
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);
210 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
212 struct rfkill_data *data;
213 struct rfkill_int_event *ev;
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);
227 static void rfkill_event(struct rfkill *rfkill)
229 if (!rfkill->registered)
230 return;
232 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
234 /* also send event to /dev/rfkill */
235 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
239 * rfkill_set_block - wrapper for set_block method
241 * @rfkill: the rfkill struct to use
242 * @blocked: the new software state
244 * Calls the set_block method (when applicable) and handles notifications
245 * etc. as well.
247 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
249 unsigned long flags;
250 bool prev, curr;
251 int err;
253 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
254 return;
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.
261 if (rfkill->ops->query)
262 rfkill->ops->query(rfkill, rfkill->data);
264 spin_lock_irqsave(&rfkill->lock, flags);
265 prev = rfkill->state & RFKILL_BLOCK_SW;
267 if (prev)
268 rfkill->state |= RFKILL_BLOCK_SW_PREV;
269 else
270 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
272 if (blocked)
273 rfkill->state |= RFKILL_BLOCK_SW;
274 else
275 rfkill->state &= ~RFKILL_BLOCK_SW;
277 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
278 spin_unlock_irqrestore(&rfkill->lock, flags);
280 err = rfkill->ops->set_block(rfkill->data, blocked);
282 spin_lock_irqsave(&rfkill->lock, flags);
283 if (err) {
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.
289 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
290 rfkill->state |= RFKILL_BLOCK_SW;
291 else
292 rfkill->state &= ~RFKILL_BLOCK_SW;
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);
299 rfkill_led_trigger_event(rfkill);
301 if (prev != curr)
302 rfkill_event(rfkill);
305 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
307 int i;
309 if (type != RFKILL_TYPE_ALL) {
310 rfkill_global_states[type].cur = blocked;
311 return;
314 for (i = 0; i < NUM_RFKILL_TYPES; i++)
315 rfkill_global_states[i].cur = blocked;
318 #ifdef CONFIG_RFKILL_INPUT
319 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
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
326 * This function sets the state of all switches of given type,
327 * unless a specific switch is suspended.
329 * Caller must have acquired rfkill_global_mutex.
331 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
333 struct rfkill *rfkill;
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;
340 rfkill_set_block(rfkill, blocked);
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
349 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
350 * Please refer to __rfkill_switch_all() for details.
352 * Does nothing if the EPO lock is active.
354 void rfkill_switch_all(enum rfkill_type type, bool blocked)
356 if (atomic_read(&rfkill_input_disabled))
357 return;
359 mutex_lock(&rfkill_global_mutex);
361 if (!rfkill_epo_lock_active)
362 __rfkill_switch_all(type, blocked);
364 mutex_unlock(&rfkill_global_mutex);
368 * rfkill_epo - emergency power off all transmitters
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.
373 * The global state before the EPO is saved and can be restored later
374 * using rfkill_restore_states().
376 void rfkill_epo(void)
378 struct rfkill *rfkill;
379 int i;
381 if (atomic_read(&rfkill_input_disabled))
382 return;
384 mutex_lock(&rfkill_global_mutex);
386 rfkill_epo_lock_active = true;
387 list_for_each_entry(rfkill, &rfkill_list, node)
388 rfkill_set_block(rfkill, true);
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;
395 mutex_unlock(&rfkill_global_mutex);
399 * rfkill_restore_states - restore global states
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().
405 void rfkill_restore_states(void)
407 int i;
409 if (atomic_read(&rfkill_input_disabled))
410 return;
412 mutex_lock(&rfkill_global_mutex);
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);
421 * rfkill_remove_epo_lock - unlock state changes
423 * Used by rfkill-input manually unlock state changes, when
424 * the EPO switch is deactivated.
426 void rfkill_remove_epo_lock(void)
428 if (atomic_read(&rfkill_input_disabled))
429 return;
431 mutex_lock(&rfkill_global_mutex);
432 rfkill_epo_lock_active = false;
433 mutex_unlock(&rfkill_global_mutex);
437 * rfkill_is_epo_lock_active - returns true EPO is active
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.
443 * Can be called in atomic context.
445 bool rfkill_is_epo_lock_active(void)
447 return rfkill_epo_lock_active;
451 * rfkill_get_global_sw_state - returns global state for a type
452 * @type: the type to get the global state of
454 * Returns the current global state for a given wireless
455 * device type.
457 bool rfkill_get_global_sw_state(const enum rfkill_type type)
459 return rfkill_global_states[type].cur;
461 #endif
463 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
465 unsigned long flags;
466 bool ret, prev;
468 BUG_ON(!rfkill);
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);
479 rfkill_led_trigger_event(rfkill);
481 if (!rfkill->registered)
482 return ret;
484 if (prev != blocked)
485 schedule_work(&rfkill->uevent_work);
487 return ret;
489 EXPORT_SYMBOL(rfkill_set_hw_state);
491 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
493 u32 bit = RFKILL_BLOCK_SW;
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;
499 if (blocked)
500 rfkill->state |= bit;
501 else
502 rfkill->state &= ~bit;
505 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
507 unsigned long flags;
508 bool prev, hwblock;
510 BUG_ON(!rfkill);
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);
519 if (!rfkill->registered)
520 return blocked;
522 if (prev != blocked && !hwblock)
523 schedule_work(&rfkill->uevent_work);
525 rfkill_led_trigger_event(rfkill);
527 return blocked;
529 EXPORT_SYMBOL(rfkill_set_sw_state);
531 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
533 unsigned long flags;
535 BUG_ON(!rfkill);
536 BUG_ON(rfkill->registered);
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);
543 EXPORT_SYMBOL(rfkill_init_sw_state);
545 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
547 unsigned long flags;
548 bool swprev, hwprev;
550 BUG_ON(!rfkill);
552 spin_lock_irqsave(&rfkill->lock, flags);
555 * No need to care about prev/setblock ... this is for uevent only
556 * and that will get triggered by rfkill_set_block anyway.
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;
566 spin_unlock_irqrestore(&rfkill->lock, flags);
568 if (!rfkill->registered) {
569 rfkill->persistent = true;
570 } else {
571 if (swprev != sw || hwprev != hw)
572 schedule_work(&rfkill->uevent_work);
574 rfkill_led_trigger_event(rfkill);
577 EXPORT_SYMBOL(rfkill_set_states);
579 static 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",
591 enum rfkill_type rfkill_find_type(const char *name)
593 int i;
595 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
597 if (!name)
598 return RFKILL_TYPE_ALL;
600 for (i = 1; i < NUM_RFKILL_TYPES; i++)
601 if (!strcmp(name, rfkill_types[i]))
602 return i;
603 return RFKILL_TYPE_ALL;
605 EXPORT_SYMBOL(rfkill_find_type);
607 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
608 char *buf)
610 struct rfkill *rfkill = to_rfkill(dev);
612 return sprintf(buf, "%s\n", rfkill->name);
614 static DEVICE_ATTR_RO(name);
616 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
617 char *buf)
619 struct rfkill *rfkill = to_rfkill(dev);
621 return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
623 static DEVICE_ATTR_RO(type);
625 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
626 char *buf)
628 struct rfkill *rfkill = to_rfkill(dev);
630 return sprintf(buf, "%d\n", rfkill->idx);
632 static DEVICE_ATTR_RO(index);
634 static ssize_t persistent_show(struct device *dev,
635 struct device_attribute *attr, char *buf)
637 struct rfkill *rfkill = to_rfkill(dev);
639 return sprintf(buf, "%d\n", rfkill->persistent);
641 static DEVICE_ATTR_RO(persistent);
643 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
644 char *buf)
646 struct rfkill *rfkill = to_rfkill(dev);
648 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
650 static DEVICE_ATTR_RO(hard);
652 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
653 char *buf)
655 struct rfkill *rfkill = to_rfkill(dev);
657 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
660 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
661 const char *buf, size_t count)
663 struct rfkill *rfkill = to_rfkill(dev);
664 unsigned long state;
665 int err;
667 if (!capable(CAP_NET_ADMIN))
668 return -EPERM;
670 err = kstrtoul(buf, 0, &state);
671 if (err)
672 return err;
674 if (state > 1 )
675 return -EINVAL;
677 mutex_lock(&rfkill_global_mutex);
678 rfkill_set_block(rfkill, state);
679 mutex_unlock(&rfkill_global_mutex);
681 return count;
683 static DEVICE_ATTR_RW(soft);
685 static u8 user_state_from_blocked(unsigned long state)
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;
692 return RFKILL_USER_STATE_UNBLOCKED;
695 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
696 char *buf)
698 struct rfkill *rfkill = to_rfkill(dev);
700 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
703 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
704 const char *buf, size_t count)
706 struct rfkill *rfkill = to_rfkill(dev);
707 unsigned long state;
708 int err;
710 if (!capable(CAP_NET_ADMIN))
711 return -EPERM;
713 err = kstrtoul(buf, 0, &state);
714 if (err)
715 return err;
717 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
718 state != RFKILL_USER_STATE_UNBLOCKED)
719 return -EINVAL;
721 mutex_lock(&rfkill_global_mutex);
722 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
723 mutex_unlock(&rfkill_global_mutex);
725 return count;
727 static DEVICE_ATTR_RW(state);
729 static 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,
739 ATTRIBUTE_GROUPS(rfkill_dev);
741 static void rfkill_release(struct device *dev)
743 struct rfkill *rfkill = to_rfkill(dev);
745 kfree(rfkill);
748 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
750 struct rfkill *rfkill = to_rfkill(dev);
751 unsigned long flags;
752 u32 state;
753 int error;
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;
770 void rfkill_pause_polling(struct rfkill *rfkill)
772 BUG_ON(!rfkill);
774 if (!rfkill->ops->poll)
775 return;
777 rfkill->polling_paused = true;
778 cancel_delayed_work_sync(&rfkill->poll_work);
780 EXPORT_SYMBOL(rfkill_pause_polling);
782 void rfkill_resume_polling(struct rfkill *rfkill)
784 BUG_ON(!rfkill);
786 if (!rfkill->ops->poll)
787 return;
789 rfkill->polling_paused = false;
791 if (rfkill->suspended)
792 return;
794 queue_delayed_work(system_power_efficient_wq,
795 &rfkill->poll_work, 0);
797 EXPORT_SYMBOL(rfkill_resume_polling);
799 #ifdef CONFIG_PM_SLEEP
800 static int rfkill_suspend(struct device *dev)
802 struct rfkill *rfkill = to_rfkill(dev);
804 rfkill->suspended = true;
805 cancel_delayed_work_sync(&rfkill->poll_work);
807 return 0;
810 static int rfkill_resume(struct device *dev)
812 struct rfkill *rfkill = to_rfkill(dev);
813 bool cur;
815 rfkill->suspended = false;
817 if (!rfkill->persistent) {
818 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
819 rfkill_set_block(rfkill, cur);
822 if (rfkill->ops->poll && !rfkill->polling_paused)
823 queue_delayed_work(system_power_efficient_wq,
824 &rfkill->poll_work, 0);
826 return 0;
829 static 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
835 static 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,
843 bool rfkill_blocked(struct rfkill *rfkill)
845 unsigned long flags;
846 u32 state;
848 spin_lock_irqsave(&rfkill->lock, flags);
849 state = rfkill->state;
850 spin_unlock_irqrestore(&rfkill->lock, flags);
852 return !!(state & RFKILL_BLOCK_ANY);
854 EXPORT_SYMBOL(rfkill_blocked);
857 struct 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)
863 struct rfkill *rfkill;
864 struct device *dev;
866 if (WARN_ON(!ops))
867 return NULL;
869 if (WARN_ON(!ops->set_block))
870 return NULL;
872 if (WARN_ON(!name))
873 return NULL;
875 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
876 return NULL;
878 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
879 if (!rfkill)
880 return NULL;
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;
889 dev = &rfkill->dev;
890 dev->class = &rfkill_class;
891 dev->parent = parent;
892 device_initialize(dev);
894 return rfkill;
896 EXPORT_SYMBOL(rfkill_alloc);
898 static void rfkill_poll(struct work_struct *work)
900 struct rfkill *rfkill;
902 rfkill = container_of(work, struct rfkill, poll_work.work);
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.
909 rfkill->ops->poll(rfkill, rfkill->data);
911 queue_delayed_work(system_power_efficient_wq,
912 &rfkill->poll_work,
913 round_jiffies_relative(POLL_INTERVAL));
916 static void rfkill_uevent_work(struct work_struct *work)
918 struct rfkill *rfkill;
920 rfkill = container_of(work, struct rfkill, uevent_work);
922 mutex_lock(&rfkill_global_mutex);
923 rfkill_event(rfkill);
924 mutex_unlock(&rfkill_global_mutex);
927 static void rfkill_sync_work(struct work_struct *work)
929 struct rfkill *rfkill;
930 bool cur;
932 rfkill = container_of(work, struct rfkill, sync_work);
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);
940 int __must_check rfkill_register(struct rfkill *rfkill)
942 static unsigned long rfkill_no;
943 struct device *dev = &rfkill->dev;
944 int error;
946 BUG_ON(!rfkill);
948 mutex_lock(&rfkill_global_mutex);
950 if (rfkill->registered) {
951 error = -EALREADY;
952 goto unlock;
955 rfkill->idx = rfkill_no;
956 dev_set_name(dev, "rfkill%lu", rfkill_no);
957 rfkill_no++;
959 list_add_tail(&rfkill->node, &rfkill_list);
961 error = device_add(dev);
962 if (error)
963 goto remove;
965 error = rfkill_led_trigger_register(rfkill);
966 if (error)
967 goto devdel;
969 rfkill->registered = true;
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);
975 if (rfkill->ops->poll)
976 queue_delayed_work(system_power_efficient_wq,
977 &rfkill->poll_work,
978 round_jiffies_relative(POLL_INTERVAL));
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);
986 if (!atomic_read(&rfkill_input_disabled))
987 __rfkill_switch_all(rfkill->type, soft_blocked);
988 #endif
991 rfkill_send_events(rfkill, RFKILL_OP_ADD);
993 mutex_unlock(&rfkill_global_mutex);
994 return 0;
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;
1004 EXPORT_SYMBOL(rfkill_register);
1006 void rfkill_unregister(struct rfkill *rfkill)
1008 BUG_ON(!rfkill);
1010 if (rfkill->ops->poll)
1011 cancel_delayed_work_sync(&rfkill->poll_work);
1013 cancel_work_sync(&rfkill->uevent_work);
1014 cancel_work_sync(&rfkill->sync_work);
1016 rfkill->registered = false;
1018 device_del(&rfkill->dev);
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);
1025 rfkill_led_trigger_unregister(rfkill);
1027 EXPORT_SYMBOL(rfkill_unregister);
1029 void rfkill_destroy(struct rfkill *rfkill)
1031 if (rfkill)
1032 put_device(&rfkill->dev);
1034 EXPORT_SYMBOL(rfkill_destroy);
1036 static int rfkill_fop_open(struct inode *inode, struct file *file)
1038 struct rfkill_data *data;
1039 struct rfkill *rfkill;
1040 struct rfkill_int_event *ev, *tmp;
1042 data = kzalloc(sizeof(*data), GFP_KERNEL);
1043 if (!data)
1044 return -ENOMEM;
1046 INIT_LIST_HEAD(&data->events);
1047 mutex_init(&data->mtx);
1048 init_waitqueue_head(&data->read_wait);
1050 mutex_lock(&rfkill_global_mutex);
1051 mutex_lock(&data->mtx);
1053 * start getting events from elsewhere but hold mtx to get
1054 * startup events added first
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);
1064 list_add(&data->list, &rfkill_fds);
1065 mutex_unlock(&data->mtx);
1066 mutex_unlock(&rfkill_global_mutex);
1068 file->private_data = data;
1070 return nonseekable_open(inode, file);
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;
1082 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1084 struct rfkill_data *data = file->private_data;
1085 unsigned int res = POLLOUT | POLLWRNORM;
1087 poll_wait(file, &data->read_wait, wait);
1089 mutex_lock(&data->mtx);
1090 if (!list_empty(&data->events))
1091 res = POLLIN | POLLRDNORM;
1092 mutex_unlock(&data->mtx);
1094 return res;
1097 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1098 size_t count, loff_t *pos)
1100 struct rfkill_data *data = file->private_data;
1101 struct rfkill_int_event *ev;
1102 unsigned long sz;
1103 int ret;
1105 mutex_lock(&data->mtx);
1107 while (list_empty(&data->events)) {
1108 if (file->f_flags & O_NONBLOCK) {
1109 ret = -EAGAIN;
1110 goto out;
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
1116 ret = wait_event_interruptible(data->read_wait,
1117 !list_empty(&data->events));
1118 mutex_lock(&data->mtx);
1120 if (ret)
1121 goto out;
1124 ev = list_first_entry(&data->events, struct rfkill_int_event,
1125 list);
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;
1132 list_del(&ev->list);
1133 kfree(ev);
1134 out:
1135 mutex_unlock(&data->mtx);
1136 return ret;
1139 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1140 size_t count, loff_t *pos)
1142 struct rfkill *rfkill;
1143 struct rfkill_event ev;
1144 int ret;
1146 /* we don't need the 'hard' variable but accept it */
1147 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1148 return -EINVAL;
1151 * Copy as much data as we can accept into our 'ev' buffer,
1152 * but tell userspace how much we've copied so it can determine
1153 * our API version even in a write() call, if it cares.
1155 count = min(count, sizeof(ev));
1156 if (copy_from_user(&ev, buf, count))
1157 return -EFAULT;
1159 if (ev.type >= NUM_RFKILL_TYPES)
1160 return -EINVAL;
1162 mutex_lock(&rfkill_global_mutex);
1164 switch (ev.op) {
1165 case RFKILL_OP_CHANGE_ALL:
1166 rfkill_update_global_state(ev.type, ev.soft);
1167 list_for_each_entry(rfkill, &rfkill_list, node)
1168 if (rfkill->type == ev.type ||
1169 ev.type == RFKILL_TYPE_ALL)
1170 rfkill_set_block(rfkill, ev.soft);
1171 ret = 0;
1172 break;
1173 case RFKILL_OP_CHANGE:
1174 list_for_each_entry(rfkill, &rfkill_list, node)
1175 if (rfkill->idx == ev.idx &&
1176 (rfkill->type == ev.type ||
1177 ev.type == RFKILL_TYPE_ALL))
1178 rfkill_set_block(rfkill, ev.soft);
1179 ret = 0;
1180 break;
1181 default:
1182 ret = -EINVAL;
1183 break;
1186 mutex_unlock(&rfkill_global_mutex);
1188 return ret ?: count;
1191 static int rfkill_fop_release(struct inode *inode, struct file *file)
1193 struct rfkill_data *data = file->private_data;
1194 struct rfkill_int_event *ev, *tmp;
1196 mutex_lock(&rfkill_global_mutex);
1197 list_del(&data->list);
1198 mutex_unlock(&rfkill_global_mutex);
1200 mutex_destroy(&data->mtx);
1201 list_for_each_entry_safe(ev, tmp, &data->events, list)
1202 kfree(ev);
1204 #ifdef CONFIG_RFKILL_INPUT
1205 if (data->input_handler)
1206 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1207 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1208 #endif
1210 kfree(data);
1212 return 0;
1215 #ifdef CONFIG_RFKILL_INPUT
1216 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1217 unsigned long arg)
1219 struct rfkill_data *data = file->private_data;
1221 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1222 return -ENOSYS;
1224 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1225 return -ENOSYS;
1227 mutex_lock(&data->mtx);
1229 if (!data->input_handler) {
1230 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1231 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1232 data->input_handler = true;
1235 mutex_unlock(&data->mtx);
1237 return 0;
1239 #endif
1241 static const struct file_operations rfkill_fops = {
1242 .owner = THIS_MODULE,
1243 .open = rfkill_fop_open,
1244 .read = rfkill_fop_read,
1245 .write = rfkill_fop_write,
1246 .poll = rfkill_fop_poll,
1247 .release = rfkill_fop_release,
1248 #ifdef CONFIG_RFKILL_INPUT
1249 .unlocked_ioctl = rfkill_fop_ioctl,
1250 .compat_ioctl = rfkill_fop_ioctl,
1251 #endif
1252 .llseek = no_llseek,
1255 static struct miscdevice rfkill_miscdev = {
1256 .name = "rfkill",
1257 .fops = &rfkill_fops,
1258 .minor = MISC_DYNAMIC_MINOR,
1261 static int __init rfkill_init(void)
1263 int error;
1265 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1267 error = class_register(&rfkill_class);
1268 if (error)
1269 goto out;
1271 error = misc_register(&rfkill_miscdev);
1272 if (error) {
1273 class_unregister(&rfkill_class);
1274 goto out;
1277 #ifdef CONFIG_RFKILL_INPUT
1278 error = rfkill_handler_init();
1279 if (error) {
1280 misc_deregister(&rfkill_miscdev);
1281 class_unregister(&rfkill_class);
1282 goto out;
1284 #endif
1286 out:
1287 return error;
1289 subsys_initcall(rfkill_init);
1291 static void __exit rfkill_exit(void)
1293 #ifdef CONFIG_RFKILL_INPUT
1294 rfkill_handler_exit();
1295 #endif
1296 misc_deregister(&rfkill_miscdev);
1297 class_unregister(&rfkill_class);
1299 module_exit(rfkill_exit);