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 void rfkill_led_trigger_event(struct rfkill *rfkill)
184 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
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)
199 ev->idx = rfkill->idx;
200 ev->type = rfkill->type;
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);
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)
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
247 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
253 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
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;
268 rfkill->state |= RFKILL_BLOCK_SW_PREV;
270 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
273 rfkill->state |= RFKILL_BLOCK_SW;
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);
285 * Failed -- reset status to _prev, this may be different
286 * from what set 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;
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);
302 rfkill_event(rfkill);
305 #ifdef CONFIG_RFKILL_INPUT
306 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
309 * __rfkill_switch_all - Toggle state of all switches of given type
310 * @type: type of interfaces to be affected
311 * @blocked: the new state
313 * This function sets the state of all switches of given type,
314 * unless a specific switch is suspended.
316 * Caller must have acquired rfkill_global_mutex.
318 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
320 struct rfkill *rfkill;
322 if (type == RFKILL_TYPE_ALL) {
325 for (i = 0; i < NUM_RFKILL_TYPES; i++)
326 rfkill_global_states[i].cur = blocked;
328 rfkill_global_states[type].cur = blocked;
331 list_for_each_entry(rfkill, &rfkill_list, node) {
332 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
335 rfkill_set_block(rfkill, blocked);
340 * rfkill_switch_all - Toggle state of all switches of given type
341 * @type: type of interfaces to be affected
342 * @blocked: the new state
344 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
345 * Please refer to __rfkill_switch_all() for details.
347 * Does nothing if the EPO lock is active.
349 void rfkill_switch_all(enum rfkill_type type, bool blocked)
351 if (atomic_read(&rfkill_input_disabled))
354 mutex_lock(&rfkill_global_mutex);
356 if (!rfkill_epo_lock_active)
357 __rfkill_switch_all(type, blocked);
359 mutex_unlock(&rfkill_global_mutex);
363 * rfkill_epo - emergency power off all transmitters
365 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
366 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
368 * The global state before the EPO is saved and can be restored later
369 * using rfkill_restore_states().
371 void rfkill_epo(void)
373 struct rfkill *rfkill;
376 if (atomic_read(&rfkill_input_disabled))
379 mutex_lock(&rfkill_global_mutex);
381 rfkill_epo_lock_active = true;
382 list_for_each_entry(rfkill, &rfkill_list, node)
383 rfkill_set_block(rfkill, true);
385 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
386 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
387 rfkill_global_states[i].cur = true;
390 mutex_unlock(&rfkill_global_mutex);
394 * rfkill_restore_states - restore global states
396 * Restore (and sync switches to) the global state from the
397 * states in rfkill_default_states. This can undo the effects of
398 * a call to rfkill_epo().
400 void rfkill_restore_states(void)
404 if (atomic_read(&rfkill_input_disabled))
407 mutex_lock(&rfkill_global_mutex);
409 rfkill_epo_lock_active = false;
410 for (i = 0; i < NUM_RFKILL_TYPES; i++)
411 __rfkill_switch_all(i, rfkill_global_states[i].sav);
412 mutex_unlock(&rfkill_global_mutex);
416 * rfkill_remove_epo_lock - unlock state changes
418 * Used by rfkill-input manually unlock state changes, when
419 * the EPO switch is deactivated.
421 void rfkill_remove_epo_lock(void)
423 if (atomic_read(&rfkill_input_disabled))
426 mutex_lock(&rfkill_global_mutex);
427 rfkill_epo_lock_active = false;
428 mutex_unlock(&rfkill_global_mutex);
432 * rfkill_is_epo_lock_active - returns true EPO is active
434 * Returns 0 (false) if there is NOT an active EPO contidion,
435 * and 1 (true) if there is an active EPO contition, which
436 * locks all radios in one of the BLOCKED states.
438 * Can be called in atomic context.
440 bool rfkill_is_epo_lock_active(void)
442 return rfkill_epo_lock_active;
446 * rfkill_get_global_sw_state - returns global state for a type
447 * @type: the type to get the global state of
449 * Returns the current global state for a given wireless
452 bool rfkill_get_global_sw_state(const enum rfkill_type type)
454 return rfkill_global_states[type].cur;
459 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
466 spin_lock_irqsave(&rfkill->lock, flags);
467 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
469 rfkill->state |= RFKILL_BLOCK_HW;
471 rfkill->state &= ~RFKILL_BLOCK_HW;
472 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
473 spin_unlock_irqrestore(&rfkill->lock, flags);
475 rfkill_led_trigger_event(rfkill);
477 if (!rfkill->registered)
481 schedule_work(&rfkill->uevent_work);
485 EXPORT_SYMBOL(rfkill_set_hw_state);
487 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
489 u32 bit = RFKILL_BLOCK_SW;
491 /* if in a ops->set_block right now, use other bit */
492 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
493 bit = RFKILL_BLOCK_SW_PREV;
496 rfkill->state |= bit;
498 rfkill->state &= ~bit;
501 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
508 spin_lock_irqsave(&rfkill->lock, flags);
509 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
510 __rfkill_set_sw_state(rfkill, blocked);
511 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
512 blocked = blocked || hwblock;
513 spin_unlock_irqrestore(&rfkill->lock, flags);
515 if (!rfkill->registered)
518 if (prev != blocked && !hwblock)
519 schedule_work(&rfkill->uevent_work);
521 rfkill_led_trigger_event(rfkill);
525 EXPORT_SYMBOL(rfkill_set_sw_state);
527 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
532 BUG_ON(rfkill->registered);
534 spin_lock_irqsave(&rfkill->lock, flags);
535 __rfkill_set_sw_state(rfkill, blocked);
536 rfkill->persistent = true;
537 spin_unlock_irqrestore(&rfkill->lock, flags);
539 EXPORT_SYMBOL(rfkill_init_sw_state);
541 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
548 spin_lock_irqsave(&rfkill->lock, flags);
551 * No need to care about prev/setblock ... this is for uevent only
552 * and that will get triggered by rfkill_set_block anyway.
554 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
555 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
556 __rfkill_set_sw_state(rfkill, sw);
558 rfkill->state |= RFKILL_BLOCK_HW;
560 rfkill->state &= ~RFKILL_BLOCK_HW;
562 spin_unlock_irqrestore(&rfkill->lock, flags);
564 if (!rfkill->registered) {
565 rfkill->persistent = true;
567 if (swprev != sw || hwprev != hw)
568 schedule_work(&rfkill->uevent_work);
570 rfkill_led_trigger_event(rfkill);
573 EXPORT_SYMBOL(rfkill_set_states);
575 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
578 struct rfkill *rfkill = to_rfkill(dev);
580 return sprintf(buf, "%s\n", rfkill->name);
582 static DEVICE_ATTR_RO(name);
584 static const char *rfkill_get_type_str(enum rfkill_type type)
586 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_NFC + 1);
589 case RFKILL_TYPE_WLAN:
591 case RFKILL_TYPE_BLUETOOTH:
593 case RFKILL_TYPE_UWB:
594 return "ultrawideband";
595 case RFKILL_TYPE_WIMAX:
597 case RFKILL_TYPE_WWAN:
599 case RFKILL_TYPE_GPS:
603 case RFKILL_TYPE_NFC:
610 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
613 struct rfkill *rfkill = to_rfkill(dev);
615 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
617 static DEVICE_ATTR_RO(type);
619 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
622 struct rfkill *rfkill = to_rfkill(dev);
624 return sprintf(buf, "%d\n", rfkill->idx);
626 static DEVICE_ATTR_RO(index);
628 static ssize_t persistent_show(struct device *dev,
629 struct device_attribute *attr, char *buf)
631 struct rfkill *rfkill = to_rfkill(dev);
633 return sprintf(buf, "%d\n", rfkill->persistent);
635 static DEVICE_ATTR_RO(persistent);
637 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
640 struct rfkill *rfkill = to_rfkill(dev);
642 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
644 static DEVICE_ATTR_RO(hard);
646 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
649 struct rfkill *rfkill = to_rfkill(dev);
651 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
654 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
655 const char *buf, size_t count)
657 struct rfkill *rfkill = to_rfkill(dev);
661 if (!capable(CAP_NET_ADMIN))
664 err = kstrtoul(buf, 0, &state);
671 mutex_lock(&rfkill_global_mutex);
672 rfkill_set_block(rfkill, state);
673 mutex_unlock(&rfkill_global_mutex);
677 static DEVICE_ATTR_RW(soft);
679 static u8 user_state_from_blocked(unsigned long state)
681 if (state & RFKILL_BLOCK_HW)
682 return RFKILL_USER_STATE_HARD_BLOCKED;
683 if (state & RFKILL_BLOCK_SW)
684 return RFKILL_USER_STATE_SOFT_BLOCKED;
686 return RFKILL_USER_STATE_UNBLOCKED;
689 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
692 struct rfkill *rfkill = to_rfkill(dev);
694 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
697 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
698 const char *buf, size_t count)
700 struct rfkill *rfkill = to_rfkill(dev);
704 if (!capable(CAP_NET_ADMIN))
707 err = kstrtoul(buf, 0, &state);
711 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
712 state != RFKILL_USER_STATE_UNBLOCKED)
715 mutex_lock(&rfkill_global_mutex);
716 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
717 mutex_unlock(&rfkill_global_mutex);
721 static DEVICE_ATTR_RW(state);
723 static struct attribute *rfkill_dev_attrs[] = {
726 &dev_attr_index.attr,
727 &dev_attr_persistent.attr,
728 &dev_attr_state.attr,
733 ATTRIBUTE_GROUPS(rfkill_dev);
735 static void rfkill_release(struct device *dev)
737 struct rfkill *rfkill = to_rfkill(dev);
742 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
744 struct rfkill *rfkill = to_rfkill(dev);
749 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
752 error = add_uevent_var(env, "RFKILL_TYPE=%s",
753 rfkill_get_type_str(rfkill->type));
756 spin_lock_irqsave(&rfkill->lock, flags);
757 state = rfkill->state;
758 spin_unlock_irqrestore(&rfkill->lock, flags);
759 error = add_uevent_var(env, "RFKILL_STATE=%d",
760 user_state_from_blocked(state));
764 void rfkill_pause_polling(struct rfkill *rfkill)
768 if (!rfkill->ops->poll)
771 rfkill->polling_paused = true;
772 cancel_delayed_work_sync(&rfkill->poll_work);
774 EXPORT_SYMBOL(rfkill_pause_polling);
776 void rfkill_resume_polling(struct rfkill *rfkill)
780 if (!rfkill->ops->poll)
783 rfkill->polling_paused = false;
785 if (rfkill->suspended)
788 queue_delayed_work(system_power_efficient_wq,
789 &rfkill->poll_work, 0);
791 EXPORT_SYMBOL(rfkill_resume_polling);
793 #ifdef CONFIG_PM_SLEEP
794 static int rfkill_suspend(struct device *dev)
796 struct rfkill *rfkill = to_rfkill(dev);
798 rfkill->suspended = true;
799 cancel_delayed_work_sync(&rfkill->poll_work);
804 static int rfkill_resume(struct device *dev)
806 struct rfkill *rfkill = to_rfkill(dev);
809 rfkill->suspended = false;
811 if (!rfkill->persistent) {
812 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
813 rfkill_set_block(rfkill, cur);
816 if (rfkill->ops->poll && !rfkill->polling_paused)
817 queue_delayed_work(system_power_efficient_wq,
818 &rfkill->poll_work, 0);
823 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
824 #define RFKILL_PM_OPS (&rfkill_pm_ops)
826 #define RFKILL_PM_OPS NULL
829 static struct class rfkill_class = {
831 .dev_release = rfkill_release,
832 .dev_groups = rfkill_dev_groups,
833 .dev_uevent = rfkill_dev_uevent,
837 bool rfkill_blocked(struct rfkill *rfkill)
842 spin_lock_irqsave(&rfkill->lock, flags);
843 state = rfkill->state;
844 spin_unlock_irqrestore(&rfkill->lock, flags);
846 return !!(state & RFKILL_BLOCK_ANY);
848 EXPORT_SYMBOL(rfkill_blocked);
851 struct rfkill * __must_check rfkill_alloc(const char *name,
852 struct device *parent,
853 const enum rfkill_type type,
854 const struct rfkill_ops *ops,
857 struct rfkill *rfkill;
863 if (WARN_ON(!ops->set_block))
869 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
872 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
876 spin_lock_init(&rfkill->lock);
877 INIT_LIST_HEAD(&rfkill->node);
879 strcpy(rfkill->name, name);
881 rfkill->data = ops_data;
884 dev->class = &rfkill_class;
885 dev->parent = parent;
886 device_initialize(dev);
890 EXPORT_SYMBOL(rfkill_alloc);
892 static void rfkill_poll(struct work_struct *work)
894 struct rfkill *rfkill;
896 rfkill = container_of(work, struct rfkill, poll_work.work);
899 * Poll hardware state -- driver will use one of the
900 * rfkill_set{,_hw,_sw}_state functions and use its
901 * return value to update the current status.
903 rfkill->ops->poll(rfkill, rfkill->data);
905 queue_delayed_work(system_power_efficient_wq,
907 round_jiffies_relative(POLL_INTERVAL));
910 static void rfkill_uevent_work(struct work_struct *work)
912 struct rfkill *rfkill;
914 rfkill = container_of(work, struct rfkill, uevent_work);
916 mutex_lock(&rfkill_global_mutex);
917 rfkill_event(rfkill);
918 mutex_unlock(&rfkill_global_mutex);
921 static void rfkill_sync_work(struct work_struct *work)
923 struct rfkill *rfkill;
926 rfkill = container_of(work, struct rfkill, sync_work);
928 mutex_lock(&rfkill_global_mutex);
929 cur = rfkill_global_states[rfkill->type].cur;
930 rfkill_set_block(rfkill, cur);
931 mutex_unlock(&rfkill_global_mutex);
934 int __must_check rfkill_register(struct rfkill *rfkill)
936 static unsigned long rfkill_no;
937 struct device *dev = &rfkill->dev;
942 mutex_lock(&rfkill_global_mutex);
944 if (rfkill->registered) {
949 rfkill->idx = rfkill_no;
950 dev_set_name(dev, "rfkill%lu", rfkill_no);
953 list_add_tail(&rfkill->node, &rfkill_list);
955 error = device_add(dev);
959 error = rfkill_led_trigger_register(rfkill);
963 rfkill->registered = true;
965 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
966 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
967 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
969 if (rfkill->ops->poll)
970 queue_delayed_work(system_power_efficient_wq,
972 round_jiffies_relative(POLL_INTERVAL));
974 if (!rfkill->persistent || rfkill_epo_lock_active) {
975 schedule_work(&rfkill->sync_work);
977 #ifdef CONFIG_RFKILL_INPUT
978 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
980 if (!atomic_read(&rfkill_input_disabled))
981 __rfkill_switch_all(rfkill->type, soft_blocked);
985 rfkill_send_events(rfkill, RFKILL_OP_ADD);
987 mutex_unlock(&rfkill_global_mutex);
991 device_del(&rfkill->dev);
993 list_del_init(&rfkill->node);
995 mutex_unlock(&rfkill_global_mutex);
998 EXPORT_SYMBOL(rfkill_register);
1000 void rfkill_unregister(struct rfkill *rfkill)
1004 if (rfkill->ops->poll)
1005 cancel_delayed_work_sync(&rfkill->poll_work);
1007 cancel_work_sync(&rfkill->uevent_work);
1008 cancel_work_sync(&rfkill->sync_work);
1010 rfkill->registered = false;
1012 device_del(&rfkill->dev);
1014 mutex_lock(&rfkill_global_mutex);
1015 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1016 list_del_init(&rfkill->node);
1017 mutex_unlock(&rfkill_global_mutex);
1019 rfkill_led_trigger_unregister(rfkill);
1021 EXPORT_SYMBOL(rfkill_unregister);
1023 void rfkill_destroy(struct rfkill *rfkill)
1026 put_device(&rfkill->dev);
1028 EXPORT_SYMBOL(rfkill_destroy);
1030 static int rfkill_fop_open(struct inode *inode, struct file *file)
1032 struct rfkill_data *data;
1033 struct rfkill *rfkill;
1034 struct rfkill_int_event *ev, *tmp;
1036 data = kzalloc(sizeof(*data), GFP_KERNEL);
1040 INIT_LIST_HEAD(&data->events);
1041 mutex_init(&data->mtx);
1042 init_waitqueue_head(&data->read_wait);
1044 mutex_lock(&rfkill_global_mutex);
1045 mutex_lock(&data->mtx);
1047 * start getting events from elsewhere but hold mtx to get
1048 * startup events added first
1051 list_for_each_entry(rfkill, &rfkill_list, node) {
1052 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1055 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1056 list_add_tail(&ev->list, &data->events);
1058 list_add(&data->list, &rfkill_fds);
1059 mutex_unlock(&data->mtx);
1060 mutex_unlock(&rfkill_global_mutex);
1062 file->private_data = data;
1064 return nonseekable_open(inode, file);
1067 mutex_unlock(&data->mtx);
1068 mutex_unlock(&rfkill_global_mutex);
1069 mutex_destroy(&data->mtx);
1070 list_for_each_entry_safe(ev, tmp, &data->events, list)
1076 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1078 struct rfkill_data *data = file->private_data;
1079 unsigned int res = POLLOUT | POLLWRNORM;
1081 poll_wait(file, &data->read_wait, wait);
1083 mutex_lock(&data->mtx);
1084 if (!list_empty(&data->events))
1085 res = POLLIN | POLLRDNORM;
1086 mutex_unlock(&data->mtx);
1091 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1092 size_t count, loff_t *pos)
1094 struct rfkill_data *data = file->private_data;
1095 struct rfkill_int_event *ev;
1099 mutex_lock(&data->mtx);
1101 while (list_empty(&data->events)) {
1102 if (file->f_flags & O_NONBLOCK) {
1106 mutex_unlock(&data->mtx);
1107 /* since we re-check and it just compares pointers,
1108 * using !list_empty() without locking isn't a problem
1110 ret = wait_event_interruptible(data->read_wait,
1111 !list_empty(&data->events));
1112 mutex_lock(&data->mtx);
1118 ev = list_first_entry(&data->events, struct rfkill_int_event,
1121 sz = min_t(unsigned long, sizeof(ev->ev), count);
1123 if (copy_to_user(buf, &ev->ev, sz))
1126 list_del(&ev->list);
1129 mutex_unlock(&data->mtx);
1133 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1134 size_t count, loff_t *pos)
1136 struct rfkill *rfkill;
1137 struct rfkill_event ev;
1139 /* we don't need the 'hard' variable but accept it */
1140 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1144 * Copy as much data as we can accept into our 'ev' buffer,
1145 * but tell userspace how much we've copied so it can determine
1146 * our API version even in a write() call, if it cares.
1148 count = min(count, sizeof(ev));
1149 if (copy_from_user(&ev, buf, count))
1152 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1155 if (ev.type >= NUM_RFKILL_TYPES)
1158 mutex_lock(&rfkill_global_mutex);
1160 if (ev.op == RFKILL_OP_CHANGE_ALL) {
1161 if (ev.type == RFKILL_TYPE_ALL) {
1163 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1164 rfkill_global_states[i].cur = ev.soft;
1166 rfkill_global_states[ev.type].cur = ev.soft;
1170 list_for_each_entry(rfkill, &rfkill_list, node) {
1171 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1174 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1177 rfkill_set_block(rfkill, ev.soft);
1179 mutex_unlock(&rfkill_global_mutex);
1184 static int rfkill_fop_release(struct inode *inode, struct file *file)
1186 struct rfkill_data *data = file->private_data;
1187 struct rfkill_int_event *ev, *tmp;
1189 mutex_lock(&rfkill_global_mutex);
1190 list_del(&data->list);
1191 mutex_unlock(&rfkill_global_mutex);
1193 mutex_destroy(&data->mtx);
1194 list_for_each_entry_safe(ev, tmp, &data->events, list)
1197 #ifdef CONFIG_RFKILL_INPUT
1198 if (data->input_handler)
1199 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1200 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1208 #ifdef CONFIG_RFKILL_INPUT
1209 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1212 struct rfkill_data *data = file->private_data;
1214 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1217 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1220 mutex_lock(&data->mtx);
1222 if (!data->input_handler) {
1223 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1224 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1225 data->input_handler = true;
1228 mutex_unlock(&data->mtx);
1234 static const struct file_operations rfkill_fops = {
1235 .owner = THIS_MODULE,
1236 .open = rfkill_fop_open,
1237 .read = rfkill_fop_read,
1238 .write = rfkill_fop_write,
1239 .poll = rfkill_fop_poll,
1240 .release = rfkill_fop_release,
1241 #ifdef CONFIG_RFKILL_INPUT
1242 .unlocked_ioctl = rfkill_fop_ioctl,
1243 .compat_ioctl = rfkill_fop_ioctl,
1245 .llseek = no_llseek,
1248 static struct miscdevice rfkill_miscdev = {
1250 .fops = &rfkill_fops,
1251 .minor = MISC_DYNAMIC_MINOR,
1254 static int __init rfkill_init(void)
1259 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1260 rfkill_global_states[i].cur = !rfkill_default_state;
1262 error = class_register(&rfkill_class);
1266 error = misc_register(&rfkill_miscdev);
1268 class_unregister(&rfkill_class);
1272 #ifdef CONFIG_RFKILL_INPUT
1273 error = rfkill_handler_init();
1275 misc_deregister(&rfkill_miscdev);
1276 class_unregister(&rfkill_class);
1284 subsys_initcall(rfkill_init);
1286 static void __exit rfkill_exit(void)
1288 #ifdef CONFIG_RFKILL_INPUT
1289 rfkill_handler_exit();
1291 misc_deregister(&rfkill_miscdev);
1292 class_unregister(&rfkill_class);
1294 module_exit(rfkill_exit);