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>
35 #include <linux/slab.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 |\
47 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
52 enum rfkill_type type;
61 const struct rfkill_ops *ops;
64 #ifdef CONFIG_RFKILL_LEDS
65 struct led_trigger led_trigger;
66 const char *ledtrigname;
70 struct list_head node;
72 struct delayed_work poll_work;
73 struct work_struct uevent_work;
74 struct work_struct sync_work;
77 #define to_rfkill(d) container_of(d, struct rfkill, dev)
79 struct rfkill_int_event {
80 struct list_head list;
81 struct rfkill_event ev;
85 struct list_head list;
86 struct list_head events;
88 wait_queue_head_t read_wait;
93 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
94 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
95 MODULE_DESCRIPTION("RF switch support");
96 MODULE_LICENSE("GPL");
100 * The locking here should be made much smarter, we currently have
101 * a bit of a stupid situation because drivers might want to register
102 * the rfkill struct under their own lock, and take this lock during
103 * rfkill method calls -- which will cause an AB-BA deadlock situation.
105 * To fix that, we need to rework this code here to be mostly lock-free
106 * and only use the mutex for list manipulations, not to protect the
107 * various other global variables. Then we can avoid holding the mutex
108 * around driver operations, and all is happy.
110 static LIST_HEAD(rfkill_list); /* list of registered rf switches */
111 static DEFINE_MUTEX(rfkill_global_mutex);
112 static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
114 static unsigned int rfkill_default_state = 1;
115 module_param_named(default_state, rfkill_default_state, uint, 0444);
116 MODULE_PARM_DESC(default_state,
117 "Default initial state for all radio types, 0 = radio off");
121 } rfkill_global_states[NUM_RFKILL_TYPES];
123 static bool rfkill_epo_lock_active;
126 #ifdef CONFIG_RFKILL_LEDS
127 static void rfkill_led_trigger_event(struct rfkill *rfkill)
129 struct led_trigger *trigger;
131 if (!rfkill->registered)
134 trigger = &rfkill->led_trigger;
136 if (rfkill->state & RFKILL_BLOCK_ANY)
137 led_trigger_event(trigger, LED_OFF);
139 led_trigger_event(trigger, LED_FULL);
142 static void rfkill_led_trigger_activate(struct led_classdev *led)
144 struct rfkill *rfkill;
146 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
148 rfkill_led_trigger_event(rfkill);
151 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
153 return rfkill->led_trigger.name;
155 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
157 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
161 rfkill->ledtrigname = name;
163 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
165 static int rfkill_led_trigger_register(struct rfkill *rfkill)
167 rfkill->led_trigger.name = rfkill->ledtrigname
168 ? : dev_name(&rfkill->dev);
169 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
170 return led_trigger_register(&rfkill->led_trigger);
173 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
175 led_trigger_unregister(&rfkill->led_trigger);
178 static void rfkill_led_trigger_event(struct rfkill *rfkill)
182 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
187 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
190 #endif /* CONFIG_RFKILL_LEDS */
192 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
193 enum rfkill_operation op)
197 ev->idx = rfkill->idx;
198 ev->type = rfkill->type;
201 spin_lock_irqsave(&rfkill->lock, flags);
202 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
203 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
204 RFKILL_BLOCK_SW_PREV));
205 spin_unlock_irqrestore(&rfkill->lock, flags);
208 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
210 struct rfkill_data *data;
211 struct rfkill_int_event *ev;
213 list_for_each_entry(data, &rfkill_fds, list) {
214 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
217 rfkill_fill_event(&ev->ev, rfkill, op);
218 mutex_lock(&data->mtx);
219 list_add_tail(&ev->list, &data->events);
220 mutex_unlock(&data->mtx);
221 wake_up_interruptible(&data->read_wait);
225 static void rfkill_event(struct rfkill *rfkill)
227 if (!rfkill->registered)
230 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
232 /* also send event to /dev/rfkill */
233 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
236 static bool __rfkill_set_hw_state(struct rfkill *rfkill,
237 bool blocked, bool *change)
244 spin_lock_irqsave(&rfkill->lock, flags);
245 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
247 rfkill->state |= RFKILL_BLOCK_HW;
249 rfkill->state &= ~RFKILL_BLOCK_HW;
250 *change = prev != blocked;
251 any = !!(rfkill->state & RFKILL_BLOCK_ANY);
252 spin_unlock_irqrestore(&rfkill->lock, flags);
254 rfkill_led_trigger_event(rfkill);
260 * rfkill_set_block - wrapper for set_block method
262 * @rfkill: the rfkill struct to use
263 * @blocked: the new software state
265 * Calls the set_block method (when applicable) and handles notifications
268 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
274 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
278 * Some platforms (...!) generate input events which affect the
279 * _hard_ kill state -- whenever something tries to change the
280 * current software state query the hardware state too.
282 if (rfkill->ops->query)
283 rfkill->ops->query(rfkill, rfkill->data);
285 spin_lock_irqsave(&rfkill->lock, flags);
286 prev = rfkill->state & RFKILL_BLOCK_SW;
288 if (rfkill->state & RFKILL_BLOCK_SW)
289 rfkill->state |= RFKILL_BLOCK_SW_PREV;
291 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
294 rfkill->state |= RFKILL_BLOCK_SW;
296 rfkill->state &= ~RFKILL_BLOCK_SW;
298 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
299 spin_unlock_irqrestore(&rfkill->lock, flags);
301 err = rfkill->ops->set_block(rfkill->data, blocked);
303 spin_lock_irqsave(&rfkill->lock, flags);
306 * Failed -- reset status to _prev, this may be different
307 * from what set set _PREV to earlier in this function
308 * if rfkill_set_sw_state was invoked.
310 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
311 rfkill->state |= RFKILL_BLOCK_SW;
313 rfkill->state &= ~RFKILL_BLOCK_SW;
315 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
316 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
317 curr = rfkill->state & RFKILL_BLOCK_SW;
318 spin_unlock_irqrestore(&rfkill->lock, flags);
320 rfkill_led_trigger_event(rfkill);
323 rfkill_event(rfkill);
326 #ifdef CONFIG_RFKILL_INPUT
327 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
330 * __rfkill_switch_all - Toggle state of all switches of given type
331 * @type: type of interfaces to be affected
332 * @blocked: the new state
334 * This function sets the state of all switches of given type,
335 * unless a specific switch is claimed by userspace (in which case,
336 * that switch is left alone) or suspended.
338 * Caller must have acquired rfkill_global_mutex.
340 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
342 struct rfkill *rfkill;
344 if (type == RFKILL_TYPE_ALL) {
347 for (i = 0; i < NUM_RFKILL_TYPES; i++)
348 rfkill_global_states[i].cur = blocked;
350 rfkill_global_states[type].cur = blocked;
353 list_for_each_entry(rfkill, &rfkill_list, node) {
354 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
357 rfkill_set_block(rfkill, blocked);
362 * rfkill_switch_all - Toggle state of all switches of given type
363 * @type: type of interfaces to be affected
364 * @blocked: the new state
366 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
367 * Please refer to __rfkill_switch_all() for details.
369 * Does nothing if the EPO lock is active.
371 void rfkill_switch_all(enum rfkill_type type, bool blocked)
373 if (atomic_read(&rfkill_input_disabled))
376 mutex_lock(&rfkill_global_mutex);
378 if (!rfkill_epo_lock_active)
379 __rfkill_switch_all(type, blocked);
381 mutex_unlock(&rfkill_global_mutex);
385 * rfkill_epo - emergency power off all transmitters
387 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
388 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
390 * The global state before the EPO is saved and can be restored later
391 * using rfkill_restore_states().
393 void rfkill_epo(void)
395 struct rfkill *rfkill;
398 if (atomic_read(&rfkill_input_disabled))
401 mutex_lock(&rfkill_global_mutex);
403 rfkill_epo_lock_active = true;
404 list_for_each_entry(rfkill, &rfkill_list, node)
405 rfkill_set_block(rfkill, true);
407 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
408 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
409 rfkill_global_states[i].cur = true;
412 mutex_unlock(&rfkill_global_mutex);
416 * rfkill_restore_states - restore global states
418 * Restore (and sync switches to) the global state from the
419 * states in rfkill_default_states. This can undo the effects of
420 * a call to rfkill_epo().
422 void rfkill_restore_states(void)
426 if (atomic_read(&rfkill_input_disabled))
429 mutex_lock(&rfkill_global_mutex);
431 rfkill_epo_lock_active = false;
432 for (i = 0; i < NUM_RFKILL_TYPES; i++)
433 __rfkill_switch_all(i, rfkill_global_states[i].sav);
434 mutex_unlock(&rfkill_global_mutex);
438 * rfkill_remove_epo_lock - unlock state changes
440 * Used by rfkill-input manually unlock state changes, when
441 * the EPO switch is deactivated.
443 void rfkill_remove_epo_lock(void)
445 if (atomic_read(&rfkill_input_disabled))
448 mutex_lock(&rfkill_global_mutex);
449 rfkill_epo_lock_active = false;
450 mutex_unlock(&rfkill_global_mutex);
454 * rfkill_is_epo_lock_active - returns true EPO is active
456 * Returns 0 (false) if there is NOT an active EPO contidion,
457 * and 1 (true) if there is an active EPO contition, which
458 * locks all radios in one of the BLOCKED states.
460 * Can be called in atomic context.
462 bool rfkill_is_epo_lock_active(void)
464 return rfkill_epo_lock_active;
468 * rfkill_get_global_sw_state - returns global state for a type
469 * @type: the type to get the global state of
471 * Returns the current global state for a given wireless
474 bool rfkill_get_global_sw_state(const enum rfkill_type type)
476 return rfkill_global_states[type].cur;
481 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
485 ret = __rfkill_set_hw_state(rfkill, blocked, &change);
487 if (!rfkill->registered)
491 schedule_work(&rfkill->uevent_work);
495 EXPORT_SYMBOL(rfkill_set_hw_state);
497 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
499 u32 bit = RFKILL_BLOCK_SW;
501 /* if in a ops->set_block right now, use other bit */
502 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
503 bit = RFKILL_BLOCK_SW_PREV;
506 rfkill->state |= bit;
508 rfkill->state &= ~bit;
511 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
518 spin_lock_irqsave(&rfkill->lock, flags);
519 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
520 __rfkill_set_sw_state(rfkill, blocked);
521 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
522 blocked = blocked || hwblock;
523 spin_unlock_irqrestore(&rfkill->lock, flags);
525 if (!rfkill->registered)
528 if (prev != blocked && !hwblock)
529 schedule_work(&rfkill->uevent_work);
531 rfkill_led_trigger_event(rfkill);
535 EXPORT_SYMBOL(rfkill_set_sw_state);
537 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
542 BUG_ON(rfkill->registered);
544 spin_lock_irqsave(&rfkill->lock, flags);
545 __rfkill_set_sw_state(rfkill, blocked);
546 rfkill->persistent = true;
547 spin_unlock_irqrestore(&rfkill->lock, flags);
549 EXPORT_SYMBOL(rfkill_init_sw_state);
551 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
558 spin_lock_irqsave(&rfkill->lock, flags);
561 * No need to care about prev/setblock ... this is for uevent only
562 * and that will get triggered by rfkill_set_block anyway.
564 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
565 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
566 __rfkill_set_sw_state(rfkill, sw);
568 rfkill->state |= RFKILL_BLOCK_HW;
570 rfkill->state &= ~RFKILL_BLOCK_HW;
572 spin_unlock_irqrestore(&rfkill->lock, flags);
574 if (!rfkill->registered) {
575 rfkill->persistent = true;
577 if (swprev != sw || hwprev != hw)
578 schedule_work(&rfkill->uevent_work);
580 rfkill_led_trigger_event(rfkill);
583 EXPORT_SYMBOL(rfkill_set_states);
585 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
588 struct rfkill *rfkill = to_rfkill(dev);
590 return sprintf(buf, "%s\n", rfkill->name);
592 static DEVICE_ATTR_RO(name);
594 static const char *rfkill_get_type_str(enum rfkill_type type)
596 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_NFC + 1);
599 case RFKILL_TYPE_WLAN:
601 case RFKILL_TYPE_BLUETOOTH:
603 case RFKILL_TYPE_UWB:
604 return "ultrawideband";
605 case RFKILL_TYPE_WIMAX:
607 case RFKILL_TYPE_WWAN:
609 case RFKILL_TYPE_GPS:
613 case RFKILL_TYPE_NFC:
620 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
623 struct rfkill *rfkill = to_rfkill(dev);
625 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
627 static DEVICE_ATTR_RO(type);
629 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
632 struct rfkill *rfkill = to_rfkill(dev);
634 return sprintf(buf, "%d\n", rfkill->idx);
636 static DEVICE_ATTR_RO(index);
638 static ssize_t persistent_show(struct device *dev,
639 struct device_attribute *attr, char *buf)
641 struct rfkill *rfkill = to_rfkill(dev);
643 return sprintf(buf, "%d\n", rfkill->persistent);
645 static DEVICE_ATTR_RO(persistent);
647 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
650 struct rfkill *rfkill = to_rfkill(dev);
652 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
654 static DEVICE_ATTR_RO(hard);
656 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
659 struct rfkill *rfkill = to_rfkill(dev);
661 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
664 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
665 const char *buf, size_t count)
667 struct rfkill *rfkill = to_rfkill(dev);
671 if (!capable(CAP_NET_ADMIN))
674 err = kstrtoul(buf, 0, &state);
681 mutex_lock(&rfkill_global_mutex);
682 rfkill_set_block(rfkill, state);
683 mutex_unlock(&rfkill_global_mutex);
687 static DEVICE_ATTR_RW(soft);
689 static u8 user_state_from_blocked(unsigned long state)
691 if (state & RFKILL_BLOCK_HW)
692 return RFKILL_USER_STATE_HARD_BLOCKED;
693 if (state & RFKILL_BLOCK_SW)
694 return RFKILL_USER_STATE_SOFT_BLOCKED;
696 return RFKILL_USER_STATE_UNBLOCKED;
699 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
702 struct rfkill *rfkill = to_rfkill(dev);
704 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
707 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
708 const char *buf, size_t count)
710 struct rfkill *rfkill = to_rfkill(dev);
714 if (!capable(CAP_NET_ADMIN))
717 err = kstrtoul(buf, 0, &state);
721 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
722 state != RFKILL_USER_STATE_UNBLOCKED)
725 mutex_lock(&rfkill_global_mutex);
726 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
727 mutex_unlock(&rfkill_global_mutex);
731 static DEVICE_ATTR_RW(state);
733 static ssize_t claim_show(struct device *dev, struct device_attribute *attr,
736 return sprintf(buf, "%d\n", 0);
738 static DEVICE_ATTR_RO(claim);
740 static struct attribute *rfkill_dev_attrs[] = {
743 &dev_attr_index.attr,
744 &dev_attr_persistent.attr,
745 &dev_attr_state.attr,
746 &dev_attr_claim.attr,
751 ATTRIBUTE_GROUPS(rfkill_dev);
753 static void rfkill_release(struct device *dev)
755 struct rfkill *rfkill = to_rfkill(dev);
760 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
762 struct rfkill *rfkill = to_rfkill(dev);
767 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
770 error = add_uevent_var(env, "RFKILL_TYPE=%s",
771 rfkill_get_type_str(rfkill->type));
774 spin_lock_irqsave(&rfkill->lock, flags);
775 state = rfkill->state;
776 spin_unlock_irqrestore(&rfkill->lock, flags);
777 error = add_uevent_var(env, "RFKILL_STATE=%d",
778 user_state_from_blocked(state));
782 void rfkill_pause_polling(struct rfkill *rfkill)
786 if (!rfkill->ops->poll)
789 cancel_delayed_work_sync(&rfkill->poll_work);
791 EXPORT_SYMBOL(rfkill_pause_polling);
793 void rfkill_resume_polling(struct rfkill *rfkill)
797 if (!rfkill->ops->poll)
800 queue_delayed_work(system_power_efficient_wq,
801 &rfkill->poll_work, 0);
803 EXPORT_SYMBOL(rfkill_resume_polling);
805 #ifdef CONFIG_RFKILL_PM
806 static int rfkill_suspend(struct device *dev)
808 struct rfkill *rfkill = to_rfkill(dev);
810 rfkill_pause_polling(rfkill);
815 static int rfkill_resume(struct device *dev)
817 struct rfkill *rfkill = to_rfkill(dev);
820 if (!rfkill->persistent) {
821 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
822 rfkill_set_block(rfkill, cur);
825 rfkill_resume_polling(rfkill);
830 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
831 #define RFKILL_PM_OPS (&rfkill_pm_ops)
833 #define RFKILL_PM_OPS NULL
836 static struct class rfkill_class = {
838 .dev_release = rfkill_release,
839 .dev_groups = rfkill_dev_groups,
840 .dev_uevent = rfkill_dev_uevent,
841 #ifdef CONFIG_RFKILL_PM
846 bool rfkill_blocked(struct rfkill *rfkill)
851 spin_lock_irqsave(&rfkill->lock, flags);
852 state = rfkill->state;
853 spin_unlock_irqrestore(&rfkill->lock, flags);
855 return !!(state & RFKILL_BLOCK_ANY);
857 EXPORT_SYMBOL(rfkill_blocked);
860 struct rfkill * __must_check rfkill_alloc(const char *name,
861 struct device *parent,
862 const enum rfkill_type type,
863 const struct rfkill_ops *ops,
866 struct rfkill *rfkill;
872 if (WARN_ON(!ops->set_block))
878 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
881 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
885 spin_lock_init(&rfkill->lock);
886 INIT_LIST_HEAD(&rfkill->node);
888 strcpy(rfkill->name, name);
890 rfkill->data = ops_data;
893 dev->class = &rfkill_class;
894 dev->parent = parent;
895 device_initialize(dev);
899 EXPORT_SYMBOL(rfkill_alloc);
901 static void rfkill_poll(struct work_struct *work)
903 struct rfkill *rfkill;
905 rfkill = container_of(work, struct rfkill, poll_work.work);
908 * Poll hardware state -- driver will use one of the
909 * rfkill_set{,_hw,_sw}_state functions and use its
910 * return value to update the current status.
912 rfkill->ops->poll(rfkill, rfkill->data);
914 queue_delayed_work(system_power_efficient_wq,
916 round_jiffies_relative(POLL_INTERVAL));
919 static void rfkill_uevent_work(struct work_struct *work)
921 struct rfkill *rfkill;
923 rfkill = container_of(work, struct rfkill, uevent_work);
925 mutex_lock(&rfkill_global_mutex);
926 rfkill_event(rfkill);
927 mutex_unlock(&rfkill_global_mutex);
930 static void rfkill_sync_work(struct work_struct *work)
932 struct rfkill *rfkill;
935 rfkill = container_of(work, struct rfkill, sync_work);
937 mutex_lock(&rfkill_global_mutex);
938 cur = rfkill_global_states[rfkill->type].cur;
939 rfkill_set_block(rfkill, cur);
940 mutex_unlock(&rfkill_global_mutex);
943 int __must_check rfkill_register(struct rfkill *rfkill)
945 static unsigned long rfkill_no;
946 struct device *dev = &rfkill->dev;
951 mutex_lock(&rfkill_global_mutex);
953 if (rfkill->registered) {
958 rfkill->idx = rfkill_no;
959 dev_set_name(dev, "rfkill%lu", rfkill_no);
962 list_add_tail(&rfkill->node, &rfkill_list);
964 error = device_add(dev);
968 error = rfkill_led_trigger_register(rfkill);
972 rfkill->registered = true;
974 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
975 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
976 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
978 if (rfkill->ops->poll)
979 queue_delayed_work(system_power_efficient_wq,
981 round_jiffies_relative(POLL_INTERVAL));
983 if (!rfkill->persistent || rfkill_epo_lock_active) {
984 schedule_work(&rfkill->sync_work);
986 #ifdef CONFIG_RFKILL_INPUT
987 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
989 if (!atomic_read(&rfkill_input_disabled))
990 __rfkill_switch_all(rfkill->type, soft_blocked);
994 rfkill_send_events(rfkill, RFKILL_OP_ADD);
996 mutex_unlock(&rfkill_global_mutex);
1000 device_del(&rfkill->dev);
1002 list_del_init(&rfkill->node);
1004 mutex_unlock(&rfkill_global_mutex);
1007 EXPORT_SYMBOL(rfkill_register);
1009 void rfkill_unregister(struct rfkill *rfkill)
1013 if (rfkill->ops->poll)
1014 cancel_delayed_work_sync(&rfkill->poll_work);
1016 cancel_work_sync(&rfkill->uevent_work);
1017 cancel_work_sync(&rfkill->sync_work);
1019 rfkill->registered = false;
1021 device_del(&rfkill->dev);
1023 mutex_lock(&rfkill_global_mutex);
1024 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1025 list_del_init(&rfkill->node);
1026 mutex_unlock(&rfkill_global_mutex);
1028 rfkill_led_trigger_unregister(rfkill);
1030 EXPORT_SYMBOL(rfkill_unregister);
1032 void rfkill_destroy(struct rfkill *rfkill)
1035 put_device(&rfkill->dev);
1037 EXPORT_SYMBOL(rfkill_destroy);
1039 static int rfkill_fop_open(struct inode *inode, struct file *file)
1041 struct rfkill_data *data;
1042 struct rfkill *rfkill;
1043 struct rfkill_int_event *ev, *tmp;
1045 data = kzalloc(sizeof(*data), GFP_KERNEL);
1049 INIT_LIST_HEAD(&data->events);
1050 mutex_init(&data->mtx);
1051 init_waitqueue_head(&data->read_wait);
1053 mutex_lock(&rfkill_global_mutex);
1054 mutex_lock(&data->mtx);
1056 * start getting events from elsewhere but hold mtx to get
1057 * startup events added first
1060 list_for_each_entry(rfkill, &rfkill_list, node) {
1061 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1064 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1065 list_add_tail(&ev->list, &data->events);
1067 list_add(&data->list, &rfkill_fds);
1068 mutex_unlock(&data->mtx);
1069 mutex_unlock(&rfkill_global_mutex);
1071 file->private_data = data;
1073 return nonseekable_open(inode, file);
1076 mutex_unlock(&data->mtx);
1077 mutex_unlock(&rfkill_global_mutex);
1078 mutex_destroy(&data->mtx);
1079 list_for_each_entry_safe(ev, tmp, &data->events, list)
1085 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1087 struct rfkill_data *data = file->private_data;
1088 unsigned int res = POLLOUT | POLLWRNORM;
1090 poll_wait(file, &data->read_wait, wait);
1092 mutex_lock(&data->mtx);
1093 if (!list_empty(&data->events))
1094 res = POLLIN | POLLRDNORM;
1095 mutex_unlock(&data->mtx);
1100 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1101 size_t count, loff_t *pos)
1103 struct rfkill_data *data = file->private_data;
1104 struct rfkill_int_event *ev;
1108 mutex_lock(&data->mtx);
1110 while (list_empty(&data->events)) {
1111 if (file->f_flags & O_NONBLOCK) {
1115 mutex_unlock(&data->mtx);
1116 /* since we re-check and it just compares pointers,
1117 * using !list_empty() without locking isn't a problem
1119 ret = wait_event_interruptible(data->read_wait,
1120 !list_empty(&data->events));
1121 mutex_lock(&data->mtx);
1127 ev = list_first_entry(&data->events, struct rfkill_int_event,
1130 sz = min_t(unsigned long, sizeof(ev->ev), count);
1132 if (copy_to_user(buf, &ev->ev, sz))
1135 list_del(&ev->list);
1138 mutex_unlock(&data->mtx);
1142 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1143 size_t count, loff_t *pos)
1145 struct rfkill *rfkill;
1146 struct rfkill_event ev;
1148 /* we don't need the 'hard' variable but accept it */
1149 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1153 * Copy as much data as we can accept into our 'ev' buffer,
1154 * but tell userspace how much we've copied so it can determine
1155 * our API version even in a write() call, if it cares.
1157 count = min(count, sizeof(ev));
1158 if (copy_from_user(&ev, buf, count))
1161 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1164 if (ev.type >= NUM_RFKILL_TYPES)
1167 mutex_lock(&rfkill_global_mutex);
1169 if (ev.op == RFKILL_OP_CHANGE_ALL) {
1170 if (ev.type == RFKILL_TYPE_ALL) {
1172 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1173 rfkill_global_states[i].cur = ev.soft;
1175 rfkill_global_states[ev.type].cur = ev.soft;
1179 list_for_each_entry(rfkill, &rfkill_list, node) {
1180 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1183 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1186 rfkill_set_block(rfkill, ev.soft);
1188 mutex_unlock(&rfkill_global_mutex);
1193 static int rfkill_fop_release(struct inode *inode, struct file *file)
1195 struct rfkill_data *data = file->private_data;
1196 struct rfkill_int_event *ev, *tmp;
1198 mutex_lock(&rfkill_global_mutex);
1199 list_del(&data->list);
1200 mutex_unlock(&rfkill_global_mutex);
1202 mutex_destroy(&data->mtx);
1203 list_for_each_entry_safe(ev, tmp, &data->events, list)
1206 #ifdef CONFIG_RFKILL_INPUT
1207 if (data->input_handler)
1208 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1209 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1217 #ifdef CONFIG_RFKILL_INPUT
1218 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1221 struct rfkill_data *data = file->private_data;
1223 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1226 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1229 mutex_lock(&data->mtx);
1231 if (!data->input_handler) {
1232 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1233 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1234 data->input_handler = true;
1237 mutex_unlock(&data->mtx);
1243 static const struct file_operations rfkill_fops = {
1244 .owner = THIS_MODULE,
1245 .open = rfkill_fop_open,
1246 .read = rfkill_fop_read,
1247 .write = rfkill_fop_write,
1248 .poll = rfkill_fop_poll,
1249 .release = rfkill_fop_release,
1250 #ifdef CONFIG_RFKILL_INPUT
1251 .unlocked_ioctl = rfkill_fop_ioctl,
1252 .compat_ioctl = rfkill_fop_ioctl,
1254 .llseek = no_llseek,
1257 static struct miscdevice rfkill_miscdev = {
1259 .fops = &rfkill_fops,
1260 .minor = MISC_DYNAMIC_MINOR,
1263 static int __init rfkill_init(void)
1268 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1269 rfkill_global_states[i].cur = !rfkill_default_state;
1271 error = class_register(&rfkill_class);
1275 error = misc_register(&rfkill_miscdev);
1277 class_unregister(&rfkill_class);
1281 #ifdef CONFIG_RFKILL_INPUT
1282 error = rfkill_handler_init();
1284 misc_deregister(&rfkill_miscdev);
1285 class_unregister(&rfkill_class);
1293 subsys_initcall(rfkill_init);
1295 static void __exit rfkill_exit(void)
1297 #ifdef CONFIG_RFKILL_INPUT
1298 rfkill_handler_exit();
1300 misc_deregister(&rfkill_miscdev);
1301 class_unregister(&rfkill_class);
1303 module_exit(rfkill_exit);