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;
63 const struct rfkill_ops *ops;
66 #ifdef CONFIG_RFKILL_LEDS
67 struct led_trigger led_trigger;
68 const char *ledtrigname;
72 struct list_head node;
74 struct delayed_work poll_work;
75 struct work_struct uevent_work;
76 struct work_struct sync_work;
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;
87 struct list_head list;
88 struct list_head events;
90 wait_queue_head_t read_wait;
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");
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)
136 trigger = &rfkill->led_trigger;
138 if (rfkill->state & RFKILL_BLOCK_ANY)
139 led_trigger_event(trigger, LED_OFF);
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)
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);
180 static struct led_trigger rfkill_any_led_trigger;
181 static struct work_struct rfkill_any_work;
183 static void rfkill_any_led_trigger_worker(struct work_struct *work)
185 enum led_brightness brightness = LED_OFF;
186 struct rfkill *rfkill;
188 mutex_lock(&rfkill_global_mutex);
189 list_for_each_entry(rfkill, &rfkill_list, node) {
190 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
191 brightness = LED_FULL;
195 mutex_unlock(&rfkill_global_mutex);
197 led_trigger_event(&rfkill_any_led_trigger, brightness);
200 static void rfkill_any_led_trigger_event(void)
202 schedule_work(&rfkill_any_work);
205 static void rfkill_any_led_trigger_activate(struct led_classdev *led_cdev)
207 rfkill_any_led_trigger_event();
210 static int rfkill_any_led_trigger_register(void)
212 INIT_WORK(&rfkill_any_work, rfkill_any_led_trigger_worker);
213 rfkill_any_led_trigger.name = "rfkill-any";
214 rfkill_any_led_trigger.activate = rfkill_any_led_trigger_activate;
215 return led_trigger_register(&rfkill_any_led_trigger);
218 static void rfkill_any_led_trigger_unregister(void)
220 led_trigger_unregister(&rfkill_any_led_trigger);
221 cancel_work_sync(&rfkill_any_work);
224 static void rfkill_led_trigger_event(struct rfkill *rfkill)
228 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
233 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
237 static void rfkill_any_led_trigger_event(void)
241 static int rfkill_any_led_trigger_register(void)
246 static void rfkill_any_led_trigger_unregister(void)
249 #endif /* CONFIG_RFKILL_LEDS */
251 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
252 enum rfkill_operation op)
256 ev->idx = rfkill->idx;
257 ev->type = rfkill->type;
260 spin_lock_irqsave(&rfkill->lock, flags);
261 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
262 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
263 RFKILL_BLOCK_SW_PREV));
264 spin_unlock_irqrestore(&rfkill->lock, flags);
267 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
269 struct rfkill_data *data;
270 struct rfkill_int_event *ev;
272 list_for_each_entry(data, &rfkill_fds, list) {
273 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
276 rfkill_fill_event(&ev->ev, rfkill, op);
277 mutex_lock(&data->mtx);
278 list_add_tail(&ev->list, &data->events);
279 mutex_unlock(&data->mtx);
280 wake_up_interruptible(&data->read_wait);
284 static void rfkill_event(struct rfkill *rfkill)
286 if (!rfkill->registered)
289 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
291 /* also send event to /dev/rfkill */
292 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
296 * rfkill_set_block - wrapper for set_block method
298 * @rfkill: the rfkill struct to use
299 * @blocked: the new software state
301 * Calls the set_block method (when applicable) and handles notifications
304 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
310 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
314 * Some platforms (...!) generate input events which affect the
315 * _hard_ kill state -- whenever something tries to change the
316 * current software state query the hardware state too.
318 if (rfkill->ops->query)
319 rfkill->ops->query(rfkill, rfkill->data);
321 spin_lock_irqsave(&rfkill->lock, flags);
322 prev = rfkill->state & RFKILL_BLOCK_SW;
325 rfkill->state |= RFKILL_BLOCK_SW_PREV;
327 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
330 rfkill->state |= RFKILL_BLOCK_SW;
332 rfkill->state &= ~RFKILL_BLOCK_SW;
334 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
335 spin_unlock_irqrestore(&rfkill->lock, flags);
337 err = rfkill->ops->set_block(rfkill->data, blocked);
339 spin_lock_irqsave(&rfkill->lock, flags);
342 * Failed -- reset status to _PREV, which may be different
343 * from what we have set _PREV to earlier in this function
344 * if rfkill_set_sw_state was invoked.
346 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
347 rfkill->state |= RFKILL_BLOCK_SW;
349 rfkill->state &= ~RFKILL_BLOCK_SW;
351 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
352 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
353 curr = rfkill->state & RFKILL_BLOCK_SW;
354 spin_unlock_irqrestore(&rfkill->lock, flags);
356 rfkill_led_trigger_event(rfkill);
357 rfkill_any_led_trigger_event();
360 rfkill_event(rfkill);
363 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
367 if (type != RFKILL_TYPE_ALL) {
368 rfkill_global_states[type].cur = blocked;
372 for (i = 0; i < NUM_RFKILL_TYPES; i++)
373 rfkill_global_states[i].cur = blocked;
376 #ifdef CONFIG_RFKILL_INPUT
377 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
380 * __rfkill_switch_all - Toggle state of all switches of given type
381 * @type: type of interfaces to be affected
382 * @blocked: the new state
384 * This function sets the state of all switches of given type,
385 * unless a specific switch is suspended.
387 * Caller must have acquired rfkill_global_mutex.
389 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
391 struct rfkill *rfkill;
393 rfkill_update_global_state(type, blocked);
394 list_for_each_entry(rfkill, &rfkill_list, node) {
395 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
398 rfkill_set_block(rfkill, blocked);
403 * rfkill_switch_all - Toggle state of all switches of given type
404 * @type: type of interfaces to be affected
405 * @blocked: the new state
407 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
408 * Please refer to __rfkill_switch_all() for details.
410 * Does nothing if the EPO lock is active.
412 void rfkill_switch_all(enum rfkill_type type, bool blocked)
414 if (atomic_read(&rfkill_input_disabled))
417 mutex_lock(&rfkill_global_mutex);
419 if (!rfkill_epo_lock_active)
420 __rfkill_switch_all(type, blocked);
422 mutex_unlock(&rfkill_global_mutex);
426 * rfkill_epo - emergency power off all transmitters
428 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
429 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
431 * The global state before the EPO is saved and can be restored later
432 * using rfkill_restore_states().
434 void rfkill_epo(void)
436 struct rfkill *rfkill;
439 if (atomic_read(&rfkill_input_disabled))
442 mutex_lock(&rfkill_global_mutex);
444 rfkill_epo_lock_active = true;
445 list_for_each_entry(rfkill, &rfkill_list, node)
446 rfkill_set_block(rfkill, true);
448 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
449 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
450 rfkill_global_states[i].cur = true;
453 mutex_unlock(&rfkill_global_mutex);
457 * rfkill_restore_states - restore global states
459 * Restore (and sync switches to) the global state from the
460 * states in rfkill_default_states. This can undo the effects of
461 * a call to rfkill_epo().
463 void rfkill_restore_states(void)
467 if (atomic_read(&rfkill_input_disabled))
470 mutex_lock(&rfkill_global_mutex);
472 rfkill_epo_lock_active = false;
473 for (i = 0; i < NUM_RFKILL_TYPES; i++)
474 __rfkill_switch_all(i, rfkill_global_states[i].sav);
475 mutex_unlock(&rfkill_global_mutex);
479 * rfkill_remove_epo_lock - unlock state changes
481 * Used by rfkill-input manually unlock state changes, when
482 * the EPO switch is deactivated.
484 void rfkill_remove_epo_lock(void)
486 if (atomic_read(&rfkill_input_disabled))
489 mutex_lock(&rfkill_global_mutex);
490 rfkill_epo_lock_active = false;
491 mutex_unlock(&rfkill_global_mutex);
495 * rfkill_is_epo_lock_active - returns true EPO is active
497 * Returns 0 (false) if there is NOT an active EPO contidion,
498 * and 1 (true) if there is an active EPO contition, which
499 * locks all radios in one of the BLOCKED states.
501 * Can be called in atomic context.
503 bool rfkill_is_epo_lock_active(void)
505 return rfkill_epo_lock_active;
509 * rfkill_get_global_sw_state - returns global state for a type
510 * @type: the type to get the global state of
512 * Returns the current global state for a given wireless
515 bool rfkill_get_global_sw_state(const enum rfkill_type type)
517 return rfkill_global_states[type].cur;
521 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
528 spin_lock_irqsave(&rfkill->lock, flags);
529 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
531 rfkill->state |= RFKILL_BLOCK_HW;
533 rfkill->state &= ~RFKILL_BLOCK_HW;
534 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
535 spin_unlock_irqrestore(&rfkill->lock, flags);
537 rfkill_led_trigger_event(rfkill);
538 rfkill_any_led_trigger_event();
540 if (rfkill->registered && prev != blocked)
541 schedule_work(&rfkill->uevent_work);
545 EXPORT_SYMBOL(rfkill_set_hw_state);
547 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
549 u32 bit = RFKILL_BLOCK_SW;
551 /* if in a ops->set_block right now, use other bit */
552 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
553 bit = RFKILL_BLOCK_SW_PREV;
556 rfkill->state |= bit;
558 rfkill->state &= ~bit;
561 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
568 spin_lock_irqsave(&rfkill->lock, flags);
569 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
570 __rfkill_set_sw_state(rfkill, blocked);
571 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
572 blocked = blocked || hwblock;
573 spin_unlock_irqrestore(&rfkill->lock, flags);
575 if (!rfkill->registered)
578 if (prev != blocked && !hwblock)
579 schedule_work(&rfkill->uevent_work);
581 rfkill_led_trigger_event(rfkill);
582 rfkill_any_led_trigger_event();
586 EXPORT_SYMBOL(rfkill_set_sw_state);
588 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
593 BUG_ON(rfkill->registered);
595 spin_lock_irqsave(&rfkill->lock, flags);
596 __rfkill_set_sw_state(rfkill, blocked);
597 rfkill->persistent = true;
598 spin_unlock_irqrestore(&rfkill->lock, flags);
600 EXPORT_SYMBOL(rfkill_init_sw_state);
602 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
609 spin_lock_irqsave(&rfkill->lock, flags);
612 * No need to care about prev/setblock ... this is for uevent only
613 * and that will get triggered by rfkill_set_block anyway.
615 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
616 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
617 __rfkill_set_sw_state(rfkill, sw);
619 rfkill->state |= RFKILL_BLOCK_HW;
621 rfkill->state &= ~RFKILL_BLOCK_HW;
623 spin_unlock_irqrestore(&rfkill->lock, flags);
625 if (!rfkill->registered) {
626 rfkill->persistent = true;
628 if (swprev != sw || hwprev != hw)
629 schedule_work(&rfkill->uevent_work);
631 rfkill_led_trigger_event(rfkill);
632 rfkill_any_led_trigger_event();
635 EXPORT_SYMBOL(rfkill_set_states);
637 static const char * const rfkill_types[] = {
638 NULL, /* RFKILL_TYPE_ALL */
649 enum rfkill_type rfkill_find_type(const char *name)
653 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
656 return RFKILL_TYPE_ALL;
658 for (i = 1; i < NUM_RFKILL_TYPES; i++)
659 if (!strcmp(name, rfkill_types[i]))
661 return RFKILL_TYPE_ALL;
663 EXPORT_SYMBOL(rfkill_find_type);
665 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
668 struct rfkill *rfkill = to_rfkill(dev);
670 return sprintf(buf, "%s\n", rfkill->name);
672 static DEVICE_ATTR_RO(name);
674 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
677 struct rfkill *rfkill = to_rfkill(dev);
679 return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
681 static DEVICE_ATTR_RO(type);
683 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
686 struct rfkill *rfkill = to_rfkill(dev);
688 return sprintf(buf, "%d\n", rfkill->idx);
690 static DEVICE_ATTR_RO(index);
692 static ssize_t persistent_show(struct device *dev,
693 struct device_attribute *attr, char *buf)
695 struct rfkill *rfkill = to_rfkill(dev);
697 return sprintf(buf, "%d\n", rfkill->persistent);
699 static DEVICE_ATTR_RO(persistent);
701 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
704 struct rfkill *rfkill = to_rfkill(dev);
706 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
708 static DEVICE_ATTR_RO(hard);
710 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
713 struct rfkill *rfkill = to_rfkill(dev);
715 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
718 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
719 const char *buf, size_t count)
721 struct rfkill *rfkill = to_rfkill(dev);
725 if (!capable(CAP_NET_ADMIN))
728 err = kstrtoul(buf, 0, &state);
735 mutex_lock(&rfkill_global_mutex);
736 rfkill_set_block(rfkill, state);
737 mutex_unlock(&rfkill_global_mutex);
741 static DEVICE_ATTR_RW(soft);
743 static u8 user_state_from_blocked(unsigned long state)
745 if (state & RFKILL_BLOCK_HW)
746 return RFKILL_USER_STATE_HARD_BLOCKED;
747 if (state & RFKILL_BLOCK_SW)
748 return RFKILL_USER_STATE_SOFT_BLOCKED;
750 return RFKILL_USER_STATE_UNBLOCKED;
753 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
756 struct rfkill *rfkill = to_rfkill(dev);
758 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
761 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
762 const char *buf, size_t count)
764 struct rfkill *rfkill = to_rfkill(dev);
768 if (!capable(CAP_NET_ADMIN))
771 err = kstrtoul(buf, 0, &state);
775 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
776 state != RFKILL_USER_STATE_UNBLOCKED)
779 mutex_lock(&rfkill_global_mutex);
780 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
781 mutex_unlock(&rfkill_global_mutex);
785 static DEVICE_ATTR_RW(state);
787 static struct attribute *rfkill_dev_attrs[] = {
790 &dev_attr_index.attr,
791 &dev_attr_persistent.attr,
792 &dev_attr_state.attr,
797 ATTRIBUTE_GROUPS(rfkill_dev);
799 static void rfkill_release(struct device *dev)
801 struct rfkill *rfkill = to_rfkill(dev);
806 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
808 struct rfkill *rfkill = to_rfkill(dev);
813 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
816 error = add_uevent_var(env, "RFKILL_TYPE=%s",
817 rfkill_types[rfkill->type]);
820 spin_lock_irqsave(&rfkill->lock, flags);
821 state = rfkill->state;
822 spin_unlock_irqrestore(&rfkill->lock, flags);
823 error = add_uevent_var(env, "RFKILL_STATE=%d",
824 user_state_from_blocked(state));
828 void rfkill_pause_polling(struct rfkill *rfkill)
832 if (!rfkill->ops->poll)
835 rfkill->polling_paused = true;
836 cancel_delayed_work_sync(&rfkill->poll_work);
838 EXPORT_SYMBOL(rfkill_pause_polling);
840 void rfkill_resume_polling(struct rfkill *rfkill)
844 if (!rfkill->ops->poll)
847 rfkill->polling_paused = false;
849 if (rfkill->suspended)
852 queue_delayed_work(system_power_efficient_wq,
853 &rfkill->poll_work, 0);
855 EXPORT_SYMBOL(rfkill_resume_polling);
857 #ifdef CONFIG_PM_SLEEP
858 static int rfkill_suspend(struct device *dev)
860 struct rfkill *rfkill = to_rfkill(dev);
862 rfkill->suspended = true;
863 cancel_delayed_work_sync(&rfkill->poll_work);
868 static int rfkill_resume(struct device *dev)
870 struct rfkill *rfkill = to_rfkill(dev);
873 rfkill->suspended = false;
875 if (!rfkill->persistent) {
876 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
877 rfkill_set_block(rfkill, cur);
880 if (rfkill->ops->poll && !rfkill->polling_paused)
881 queue_delayed_work(system_power_efficient_wq,
882 &rfkill->poll_work, 0);
887 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
888 #define RFKILL_PM_OPS (&rfkill_pm_ops)
890 #define RFKILL_PM_OPS NULL
893 static struct class rfkill_class = {
895 .dev_release = rfkill_release,
896 .dev_groups = rfkill_dev_groups,
897 .dev_uevent = rfkill_dev_uevent,
901 bool rfkill_blocked(struct rfkill *rfkill)
906 spin_lock_irqsave(&rfkill->lock, flags);
907 state = rfkill->state;
908 spin_unlock_irqrestore(&rfkill->lock, flags);
910 return !!(state & RFKILL_BLOCK_ANY);
912 EXPORT_SYMBOL(rfkill_blocked);
915 struct rfkill * __must_check rfkill_alloc(const char *name,
916 struct device *parent,
917 const enum rfkill_type type,
918 const struct rfkill_ops *ops,
921 struct rfkill *rfkill;
927 if (WARN_ON(!ops->set_block))
933 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
936 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
940 spin_lock_init(&rfkill->lock);
941 INIT_LIST_HEAD(&rfkill->node);
943 strcpy(rfkill->name, name);
945 rfkill->data = ops_data;
948 dev->class = &rfkill_class;
949 dev->parent = parent;
950 device_initialize(dev);
954 EXPORT_SYMBOL(rfkill_alloc);
956 static void rfkill_poll(struct work_struct *work)
958 struct rfkill *rfkill;
960 rfkill = container_of(work, struct rfkill, poll_work.work);
963 * Poll hardware state -- driver will use one of the
964 * rfkill_set{,_hw,_sw}_state functions and use its
965 * return value to update the current status.
967 rfkill->ops->poll(rfkill, rfkill->data);
969 queue_delayed_work(system_power_efficient_wq,
971 round_jiffies_relative(POLL_INTERVAL));
974 static void rfkill_uevent_work(struct work_struct *work)
976 struct rfkill *rfkill;
978 rfkill = container_of(work, struct rfkill, uevent_work);
980 mutex_lock(&rfkill_global_mutex);
981 rfkill_event(rfkill);
982 mutex_unlock(&rfkill_global_mutex);
985 static void rfkill_sync_work(struct work_struct *work)
987 struct rfkill *rfkill;
990 rfkill = container_of(work, struct rfkill, sync_work);
992 mutex_lock(&rfkill_global_mutex);
993 cur = rfkill_global_states[rfkill->type].cur;
994 rfkill_set_block(rfkill, cur);
995 mutex_unlock(&rfkill_global_mutex);
998 int __must_check rfkill_register(struct rfkill *rfkill)
1000 static unsigned long rfkill_no;
1009 mutex_lock(&rfkill_global_mutex);
1011 if (rfkill->registered) {
1016 rfkill->idx = rfkill_no;
1017 dev_set_name(dev, "rfkill%lu", rfkill_no);
1020 list_add_tail(&rfkill->node, &rfkill_list);
1022 error = device_add(dev);
1026 error = rfkill_led_trigger_register(rfkill);
1030 rfkill->registered = true;
1032 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1033 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1034 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1036 if (rfkill->ops->poll)
1037 queue_delayed_work(system_power_efficient_wq,
1039 round_jiffies_relative(POLL_INTERVAL));
1041 if (!rfkill->persistent || rfkill_epo_lock_active) {
1042 schedule_work(&rfkill->sync_work);
1044 #ifdef CONFIG_RFKILL_INPUT
1045 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1047 if (!atomic_read(&rfkill_input_disabled))
1048 __rfkill_switch_all(rfkill->type, soft_blocked);
1052 rfkill_any_led_trigger_event();
1053 rfkill_send_events(rfkill, RFKILL_OP_ADD);
1055 mutex_unlock(&rfkill_global_mutex);
1059 device_del(&rfkill->dev);
1061 list_del_init(&rfkill->node);
1063 mutex_unlock(&rfkill_global_mutex);
1066 EXPORT_SYMBOL(rfkill_register);
1068 void rfkill_unregister(struct rfkill *rfkill)
1072 if (rfkill->ops->poll)
1073 cancel_delayed_work_sync(&rfkill->poll_work);
1075 cancel_work_sync(&rfkill->uevent_work);
1076 cancel_work_sync(&rfkill->sync_work);
1078 rfkill->registered = false;
1080 device_del(&rfkill->dev);
1082 mutex_lock(&rfkill_global_mutex);
1083 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1084 list_del_init(&rfkill->node);
1085 rfkill_any_led_trigger_event();
1086 mutex_unlock(&rfkill_global_mutex);
1088 rfkill_led_trigger_unregister(rfkill);
1090 EXPORT_SYMBOL(rfkill_unregister);
1092 void rfkill_destroy(struct rfkill *rfkill)
1095 put_device(&rfkill->dev);
1097 EXPORT_SYMBOL(rfkill_destroy);
1099 static int rfkill_fop_open(struct inode *inode, struct file *file)
1101 struct rfkill_data *data;
1102 struct rfkill *rfkill;
1103 struct rfkill_int_event *ev, *tmp;
1105 data = kzalloc(sizeof(*data), GFP_KERNEL);
1109 INIT_LIST_HEAD(&data->events);
1110 mutex_init(&data->mtx);
1111 init_waitqueue_head(&data->read_wait);
1113 mutex_lock(&rfkill_global_mutex);
1114 mutex_lock(&data->mtx);
1116 * start getting events from elsewhere but hold mtx to get
1117 * startup events added first
1120 list_for_each_entry(rfkill, &rfkill_list, node) {
1121 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1124 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1125 list_add_tail(&ev->list, &data->events);
1127 list_add(&data->list, &rfkill_fds);
1128 mutex_unlock(&data->mtx);
1129 mutex_unlock(&rfkill_global_mutex);
1131 file->private_data = data;
1133 return nonseekable_open(inode, file);
1136 mutex_unlock(&data->mtx);
1137 mutex_unlock(&rfkill_global_mutex);
1138 mutex_destroy(&data->mtx);
1139 list_for_each_entry_safe(ev, tmp, &data->events, list)
1145 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1147 struct rfkill_data *data = file->private_data;
1148 unsigned int res = POLLOUT | POLLWRNORM;
1150 poll_wait(file, &data->read_wait, wait);
1152 mutex_lock(&data->mtx);
1153 if (!list_empty(&data->events))
1154 res = POLLIN | POLLRDNORM;
1155 mutex_unlock(&data->mtx);
1160 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1161 size_t count, loff_t *pos)
1163 struct rfkill_data *data = file->private_data;
1164 struct rfkill_int_event *ev;
1168 mutex_lock(&data->mtx);
1170 while (list_empty(&data->events)) {
1171 if (file->f_flags & O_NONBLOCK) {
1175 mutex_unlock(&data->mtx);
1176 /* since we re-check and it just compares pointers,
1177 * using !list_empty() without locking isn't a problem
1179 ret = wait_event_interruptible(data->read_wait,
1180 !list_empty(&data->events));
1181 mutex_lock(&data->mtx);
1187 ev = list_first_entry(&data->events, struct rfkill_int_event,
1190 sz = min_t(unsigned long, sizeof(ev->ev), count);
1192 if (copy_to_user(buf, &ev->ev, sz))
1195 list_del(&ev->list);
1198 mutex_unlock(&data->mtx);
1202 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1203 size_t count, loff_t *pos)
1205 struct rfkill *rfkill;
1206 struct rfkill_event ev;
1209 /* we don't need the 'hard' variable but accept it */
1210 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1214 * Copy as much data as we can accept into our 'ev' buffer,
1215 * but tell userspace how much we've copied so it can determine
1216 * our API version even in a write() call, if it cares.
1218 count = min(count, sizeof(ev));
1219 if (copy_from_user(&ev, buf, count))
1222 if (ev.type >= NUM_RFKILL_TYPES)
1225 mutex_lock(&rfkill_global_mutex);
1228 case RFKILL_OP_CHANGE_ALL:
1229 rfkill_update_global_state(ev.type, ev.soft);
1230 list_for_each_entry(rfkill, &rfkill_list, node)
1231 if (rfkill->type == ev.type ||
1232 ev.type == RFKILL_TYPE_ALL)
1233 rfkill_set_block(rfkill, ev.soft);
1236 case RFKILL_OP_CHANGE:
1237 list_for_each_entry(rfkill, &rfkill_list, node)
1238 if (rfkill->idx == ev.idx &&
1239 (rfkill->type == ev.type ||
1240 ev.type == RFKILL_TYPE_ALL))
1241 rfkill_set_block(rfkill, ev.soft);
1249 mutex_unlock(&rfkill_global_mutex);
1251 return ret ?: count;
1254 static int rfkill_fop_release(struct inode *inode, struct file *file)
1256 struct rfkill_data *data = file->private_data;
1257 struct rfkill_int_event *ev, *tmp;
1259 mutex_lock(&rfkill_global_mutex);
1260 list_del(&data->list);
1261 mutex_unlock(&rfkill_global_mutex);
1263 mutex_destroy(&data->mtx);
1264 list_for_each_entry_safe(ev, tmp, &data->events, list)
1267 #ifdef CONFIG_RFKILL_INPUT
1268 if (data->input_handler)
1269 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1270 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1278 #ifdef CONFIG_RFKILL_INPUT
1279 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1282 struct rfkill_data *data = file->private_data;
1284 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1287 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1290 mutex_lock(&data->mtx);
1292 if (!data->input_handler) {
1293 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1294 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1295 data->input_handler = true;
1298 mutex_unlock(&data->mtx);
1304 static const struct file_operations rfkill_fops = {
1305 .owner = THIS_MODULE,
1306 .open = rfkill_fop_open,
1307 .read = rfkill_fop_read,
1308 .write = rfkill_fop_write,
1309 .poll = rfkill_fop_poll,
1310 .release = rfkill_fop_release,
1311 #ifdef CONFIG_RFKILL_INPUT
1312 .unlocked_ioctl = rfkill_fop_ioctl,
1313 .compat_ioctl = rfkill_fop_ioctl,
1315 .llseek = no_llseek,
1318 #define RFKILL_NAME "rfkill"
1320 static struct miscdevice rfkill_miscdev = {
1321 .fops = &rfkill_fops,
1322 .name = RFKILL_NAME,
1323 .minor = RFKILL_MINOR,
1326 static int __init rfkill_init(void)
1330 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1332 error = class_register(&rfkill_class);
1336 error = misc_register(&rfkill_miscdev);
1340 error = rfkill_any_led_trigger_register();
1342 goto error_led_trigger;
1344 #ifdef CONFIG_RFKILL_INPUT
1345 error = rfkill_handler_init();
1352 #ifdef CONFIG_RFKILL_INPUT
1354 rfkill_any_led_trigger_unregister();
1357 misc_deregister(&rfkill_miscdev);
1359 class_unregister(&rfkill_class);
1363 subsys_initcall(rfkill_init);
1365 static void __exit rfkill_exit(void)
1367 #ifdef CONFIG_RFKILL_INPUT
1368 rfkill_handler_exit();
1370 rfkill_any_led_trigger_unregister();
1371 misc_deregister(&rfkill_miscdev);
1372 class_unregister(&rfkill_class);
1374 module_exit(rfkill_exit);
1376 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1377 MODULE_ALIAS("devname:" RFKILL_NAME);