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, write to the
18 * Free Software Foundation, Inc.,
19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/workqueue.h>
26 #include <linux/capability.h>
27 #include <linux/list.h>
28 #include <linux/mutex.h>
29 #include <linux/rfkill.h>
30 #include <linux/spinlock.h>
31 #include <linux/miscdevice.h>
32 #include <linux/wait.h>
33 #include <linux/poll.h>
38 #define POLL_INTERVAL (5 * HZ)
40 #define RFKILL_BLOCK_HW BIT(0)
41 #define RFKILL_BLOCK_SW BIT(1)
42 #define RFKILL_BLOCK_SW_PREV BIT(2)
43 #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
46 #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;
76 #define to_rfkill(d) container_of(d, struct rfkill, dev)
78 struct rfkill_int_event {
79 struct list_head list;
80 struct rfkill_event ev;
84 struct list_head list;
85 struct list_head events;
87 wait_queue_head_t read_wait;
92 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
93 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
94 MODULE_DESCRIPTION("RF switch support");
95 MODULE_LICENSE("GPL");
99 * The locking here should be made much smarter, we currently have
100 * a bit of a stupid situation because drivers might want to register
101 * the rfkill struct under their own lock, and take this lock during
102 * rfkill method calls -- which will cause an AB-BA deadlock situation.
104 * To fix that, we need to rework this code here to be mostly lock-free
105 * and only use the mutex for list manipulations, not to protect the
106 * various other global variables. Then we can avoid holding the mutex
107 * around driver operations, and all is happy.
109 static LIST_HEAD(rfkill_list); /* list of registered rf switches */
110 static DEFINE_MUTEX(rfkill_global_mutex);
111 static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
113 static unsigned int rfkill_default_state = 1;
114 module_param_named(default_state, rfkill_default_state, uint, 0444);
115 MODULE_PARM_DESC(default_state,
116 "Default initial state for all radio types, 0 = radio off");
120 } rfkill_global_states[NUM_RFKILL_TYPES];
122 static bool rfkill_epo_lock_active;
125 #ifdef CONFIG_RFKILL_LEDS
126 static void rfkill_led_trigger_event(struct rfkill *rfkill)
128 struct led_trigger *trigger;
130 if (!rfkill->registered)
133 trigger = &rfkill->led_trigger;
135 if (rfkill->state & RFKILL_BLOCK_ANY)
136 led_trigger_event(trigger, LED_OFF);
138 led_trigger_event(trigger, LED_FULL);
141 static void rfkill_led_trigger_activate(struct led_classdev *led)
143 struct rfkill *rfkill;
145 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
147 rfkill_led_trigger_event(rfkill);
150 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
152 return rfkill->led_trigger.name;
154 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
156 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
160 rfkill->ledtrigname = name;
162 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
164 static int rfkill_led_trigger_register(struct rfkill *rfkill)
166 rfkill->led_trigger.name = rfkill->ledtrigname
167 ? : dev_name(&rfkill->dev);
168 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
169 return led_trigger_register(&rfkill->led_trigger);
172 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
174 led_trigger_unregister(&rfkill->led_trigger);
177 static void rfkill_led_trigger_event(struct rfkill *rfkill)
181 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
186 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
189 #endif /* CONFIG_RFKILL_LEDS */
191 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
192 enum rfkill_operation op)
196 ev->idx = rfkill->idx;
197 ev->type = rfkill->type;
200 spin_lock_irqsave(&rfkill->lock, flags);
201 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
202 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
203 RFKILL_BLOCK_SW_PREV));
204 spin_unlock_irqrestore(&rfkill->lock, flags);
207 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
209 struct rfkill_data *data;
210 struct rfkill_int_event *ev;
212 list_for_each_entry(data, &rfkill_fds, list) {
213 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
216 rfkill_fill_event(&ev->ev, rfkill, op);
217 mutex_lock(&data->mtx);
218 list_add_tail(&ev->list, &data->events);
219 mutex_unlock(&data->mtx);
220 wake_up_interruptible(&data->read_wait);
224 static void rfkill_event(struct rfkill *rfkill)
226 if (!rfkill->registered)
229 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
231 /* also send event to /dev/rfkill */
232 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
235 static bool __rfkill_set_hw_state(struct rfkill *rfkill,
236 bool blocked, bool *change)
243 spin_lock_irqsave(&rfkill->lock, flags);
244 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
246 rfkill->state |= RFKILL_BLOCK_HW;
248 rfkill->state &= ~RFKILL_BLOCK_HW;
249 *change = prev != blocked;
250 any = rfkill->state & RFKILL_BLOCK_ANY;
251 spin_unlock_irqrestore(&rfkill->lock, flags);
253 rfkill_led_trigger_event(rfkill);
259 * rfkill_set_block - wrapper for set_block method
261 * @rfkill: the rfkill struct to use
262 * @blocked: the new software state
264 * Calls the set_block method (when applicable) and handles notifications
267 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
272 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
276 * Some platforms (...!) generate input events which affect the
277 * _hard_ kill state -- whenever something tries to change the
278 * current software state query the hardware state too.
280 if (rfkill->ops->query)
281 rfkill->ops->query(rfkill, rfkill->data);
283 spin_lock_irqsave(&rfkill->lock, flags);
284 if (rfkill->state & RFKILL_BLOCK_SW)
285 rfkill->state |= RFKILL_BLOCK_SW_PREV;
287 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 spin_unlock_irqrestore(&rfkill->lock, flags);
297 err = rfkill->ops->set_block(rfkill->data, blocked);
299 spin_lock_irqsave(&rfkill->lock, flags);
302 * Failed -- reset status to _prev, this may be different
303 * from what set set _PREV to earlier in this function
304 * if rfkill_set_sw_state was invoked.
306 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
307 rfkill->state |= RFKILL_BLOCK_SW;
309 rfkill->state &= ~RFKILL_BLOCK_SW;
311 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
312 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
313 spin_unlock_irqrestore(&rfkill->lock, flags);
315 rfkill_led_trigger_event(rfkill);
316 rfkill_event(rfkill);
319 #ifdef CONFIG_RFKILL_INPUT
320 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
323 * __rfkill_switch_all - Toggle state of all switches of given type
324 * @type: type of interfaces to be affected
325 * @state: the new state
327 * This function sets the state of all switches of given type,
328 * unless a specific switch is claimed by userspace (in which case,
329 * that switch is left alone) or suspended.
331 * Caller must have acquired rfkill_global_mutex.
333 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
335 struct rfkill *rfkill;
337 rfkill_global_states[type].cur = blocked;
338 list_for_each_entry(rfkill, &rfkill_list, node) {
339 if (rfkill->type != type)
342 rfkill_set_block(rfkill, blocked);
347 * rfkill_switch_all - Toggle state of all switches of given type
348 * @type: type of interfaces to be affected
349 * @state: the new state
351 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
352 * Please refer to __rfkill_switch_all() for details.
354 * Does nothing if the EPO lock is active.
356 void rfkill_switch_all(enum rfkill_type type, bool blocked)
358 if (atomic_read(&rfkill_input_disabled))
361 mutex_lock(&rfkill_global_mutex);
363 if (!rfkill_epo_lock_active)
364 __rfkill_switch_all(type, blocked);
366 mutex_unlock(&rfkill_global_mutex);
370 * rfkill_epo - emergency power off all transmitters
372 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
373 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
375 * The global state before the EPO is saved and can be restored later
376 * using rfkill_restore_states().
378 void rfkill_epo(void)
380 struct rfkill *rfkill;
383 if (atomic_read(&rfkill_input_disabled))
386 mutex_lock(&rfkill_global_mutex);
388 rfkill_epo_lock_active = true;
389 list_for_each_entry(rfkill, &rfkill_list, node)
390 rfkill_set_block(rfkill, true);
392 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
393 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
394 rfkill_global_states[i].cur = true;
397 mutex_unlock(&rfkill_global_mutex);
401 * rfkill_restore_states - restore global states
403 * Restore (and sync switches to) the global state from the
404 * states in rfkill_default_states. This can undo the effects of
405 * a call to rfkill_epo().
407 void rfkill_restore_states(void)
411 if (atomic_read(&rfkill_input_disabled))
414 mutex_lock(&rfkill_global_mutex);
416 rfkill_epo_lock_active = false;
417 for (i = 0; i < NUM_RFKILL_TYPES; i++)
418 __rfkill_switch_all(i, rfkill_global_states[i].sav);
419 mutex_unlock(&rfkill_global_mutex);
423 * rfkill_remove_epo_lock - unlock state changes
425 * Used by rfkill-input manually unlock state changes, when
426 * the EPO switch is deactivated.
428 void rfkill_remove_epo_lock(void)
430 if (atomic_read(&rfkill_input_disabled))
433 mutex_lock(&rfkill_global_mutex);
434 rfkill_epo_lock_active = false;
435 mutex_unlock(&rfkill_global_mutex);
439 * rfkill_is_epo_lock_active - returns true EPO is active
441 * Returns 0 (false) if there is NOT an active EPO contidion,
442 * and 1 (true) if there is an active EPO contition, which
443 * locks all radios in one of the BLOCKED states.
445 * Can be called in atomic context.
447 bool rfkill_is_epo_lock_active(void)
449 return rfkill_epo_lock_active;
453 * rfkill_get_global_sw_state - returns global state for a type
454 * @type: the type to get the global state of
456 * Returns the current global state for a given wireless
459 bool rfkill_get_global_sw_state(const enum rfkill_type type)
461 return rfkill_global_states[type].cur;
466 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
470 ret = __rfkill_set_hw_state(rfkill, blocked, &change);
472 if (!rfkill->registered)
476 schedule_work(&rfkill->uevent_work);
480 EXPORT_SYMBOL(rfkill_set_hw_state);
482 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
484 u32 bit = RFKILL_BLOCK_SW;
486 /* if in a ops->set_block right now, use other bit */
487 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
488 bit = RFKILL_BLOCK_SW_PREV;
491 rfkill->state |= bit;
493 rfkill->state &= ~bit;
496 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
503 spin_lock_irqsave(&rfkill->lock, flags);
504 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
505 __rfkill_set_sw_state(rfkill, blocked);
506 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
507 blocked = blocked || hwblock;
508 spin_unlock_irqrestore(&rfkill->lock, flags);
510 if (!rfkill->registered)
513 if (prev != blocked && !hwblock)
514 schedule_work(&rfkill->uevent_work);
516 rfkill_led_trigger_event(rfkill);
520 EXPORT_SYMBOL(rfkill_set_sw_state);
522 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
527 BUG_ON(rfkill->registered);
529 spin_lock_irqsave(&rfkill->lock, flags);
530 __rfkill_set_sw_state(rfkill, blocked);
531 rfkill->persistent = true;
532 spin_unlock_irqrestore(&rfkill->lock, flags);
534 EXPORT_SYMBOL(rfkill_init_sw_state);
536 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
543 spin_lock_irqsave(&rfkill->lock, flags);
546 * No need to care about prev/setblock ... this is for uevent only
547 * and that will get triggered by rfkill_set_block anyway.
549 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
550 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
551 __rfkill_set_sw_state(rfkill, sw);
553 spin_unlock_irqrestore(&rfkill->lock, flags);
555 if (!rfkill->registered) {
556 rfkill->persistent = true;
558 if (swprev != sw || hwprev != hw)
559 schedule_work(&rfkill->uevent_work);
561 rfkill_led_trigger_event(rfkill);
564 EXPORT_SYMBOL(rfkill_set_states);
566 static ssize_t rfkill_name_show(struct device *dev,
567 struct device_attribute *attr,
570 struct rfkill *rfkill = to_rfkill(dev);
572 return sprintf(buf, "%s\n", rfkill->name);
575 static const char *rfkill_get_type_str(enum rfkill_type type)
578 case RFKILL_TYPE_WLAN:
580 case RFKILL_TYPE_BLUETOOTH:
582 case RFKILL_TYPE_UWB:
583 return "ultrawideband";
584 case RFKILL_TYPE_WIMAX:
586 case RFKILL_TYPE_WWAN:
592 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_WWAN + 1);
595 static ssize_t rfkill_type_show(struct device *dev,
596 struct device_attribute *attr,
599 struct rfkill *rfkill = to_rfkill(dev);
601 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
604 static ssize_t rfkill_idx_show(struct device *dev,
605 struct device_attribute *attr,
608 struct rfkill *rfkill = to_rfkill(dev);
610 return sprintf(buf, "%d\n", rfkill->idx);
613 static ssize_t rfkill_persistent_show(struct device *dev,
614 struct device_attribute *attr,
617 struct rfkill *rfkill = to_rfkill(dev);
619 return sprintf(buf, "%d\n", rfkill->persistent);
622 static u8 user_state_from_blocked(unsigned long state)
624 if (state & RFKILL_BLOCK_HW)
625 return RFKILL_USER_STATE_HARD_BLOCKED;
626 if (state & RFKILL_BLOCK_SW)
627 return RFKILL_USER_STATE_SOFT_BLOCKED;
629 return RFKILL_USER_STATE_UNBLOCKED;
632 static ssize_t rfkill_state_show(struct device *dev,
633 struct device_attribute *attr,
636 struct rfkill *rfkill = to_rfkill(dev);
640 spin_lock_irqsave(&rfkill->lock, flags);
641 state = rfkill->state;
642 spin_unlock_irqrestore(&rfkill->lock, flags);
644 return sprintf(buf, "%d\n", user_state_from_blocked(state));
647 static ssize_t rfkill_state_store(struct device *dev,
648 struct device_attribute *attr,
649 const char *buf, size_t count)
651 struct rfkill *rfkill = to_rfkill(dev);
655 if (!capable(CAP_NET_ADMIN))
658 err = strict_strtoul(buf, 0, &state);
662 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
663 state != RFKILL_USER_STATE_UNBLOCKED)
666 mutex_lock(&rfkill_global_mutex);
667 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
668 mutex_unlock(&rfkill_global_mutex);
673 static ssize_t rfkill_claim_show(struct device *dev,
674 struct device_attribute *attr,
677 return sprintf(buf, "%d\n", 0);
680 static ssize_t rfkill_claim_store(struct device *dev,
681 struct device_attribute *attr,
682 const char *buf, size_t count)
687 static struct device_attribute rfkill_dev_attrs[] = {
688 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
689 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
690 __ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
691 __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
692 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
693 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
697 static void rfkill_release(struct device *dev)
699 struct rfkill *rfkill = to_rfkill(dev);
704 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
706 struct rfkill *rfkill = to_rfkill(dev);
711 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
714 error = add_uevent_var(env, "RFKILL_TYPE=%s",
715 rfkill_get_type_str(rfkill->type));
718 spin_lock_irqsave(&rfkill->lock, flags);
719 state = rfkill->state;
720 spin_unlock_irqrestore(&rfkill->lock, flags);
721 error = add_uevent_var(env, "RFKILL_STATE=%d",
722 user_state_from_blocked(state));
726 void rfkill_pause_polling(struct rfkill *rfkill)
730 if (!rfkill->ops->poll)
733 cancel_delayed_work_sync(&rfkill->poll_work);
735 EXPORT_SYMBOL(rfkill_pause_polling);
737 void rfkill_resume_polling(struct rfkill *rfkill)
741 if (!rfkill->ops->poll)
744 schedule_work(&rfkill->poll_work.work);
746 EXPORT_SYMBOL(rfkill_resume_polling);
748 static int rfkill_suspend(struct device *dev, pm_message_t state)
750 struct rfkill *rfkill = to_rfkill(dev);
752 rfkill_pause_polling(rfkill);
757 static int rfkill_resume(struct device *dev)
759 struct rfkill *rfkill = to_rfkill(dev);
762 if (!rfkill->persistent) {
763 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
764 rfkill_set_block(rfkill, cur);
767 rfkill_resume_polling(rfkill);
772 static struct class rfkill_class = {
774 .dev_release = rfkill_release,
775 .dev_attrs = rfkill_dev_attrs,
776 .dev_uevent = rfkill_dev_uevent,
777 .suspend = rfkill_suspend,
778 .resume = rfkill_resume,
781 bool rfkill_blocked(struct rfkill *rfkill)
786 spin_lock_irqsave(&rfkill->lock, flags);
787 state = rfkill->state;
788 spin_unlock_irqrestore(&rfkill->lock, flags);
790 return !!(state & RFKILL_BLOCK_ANY);
792 EXPORT_SYMBOL(rfkill_blocked);
795 struct rfkill * __must_check rfkill_alloc(const char *name,
796 struct device *parent,
797 const enum rfkill_type type,
798 const struct rfkill_ops *ops,
801 struct rfkill *rfkill;
807 if (WARN_ON(!ops->set_block))
813 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
816 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
820 spin_lock_init(&rfkill->lock);
821 INIT_LIST_HEAD(&rfkill->node);
825 rfkill->data = ops_data;
828 dev->class = &rfkill_class;
829 dev->parent = parent;
830 device_initialize(dev);
834 EXPORT_SYMBOL(rfkill_alloc);
836 static void rfkill_poll(struct work_struct *work)
838 struct rfkill *rfkill;
840 rfkill = container_of(work, struct rfkill, poll_work.work);
843 * Poll hardware state -- driver will use one of the
844 * rfkill_set{,_hw,_sw}_state functions and use its
845 * return value to update the current status.
847 rfkill->ops->poll(rfkill, rfkill->data);
849 schedule_delayed_work(&rfkill->poll_work,
850 round_jiffies_relative(POLL_INTERVAL));
853 static void rfkill_uevent_work(struct work_struct *work)
855 struct rfkill *rfkill;
857 rfkill = container_of(work, struct rfkill, uevent_work);
859 mutex_lock(&rfkill_global_mutex);
860 rfkill_event(rfkill);
861 mutex_unlock(&rfkill_global_mutex);
864 static void rfkill_sync_work(struct work_struct *work)
866 struct rfkill *rfkill;
869 rfkill = container_of(work, struct rfkill, sync_work);
871 mutex_lock(&rfkill_global_mutex);
872 cur = rfkill_global_states[rfkill->type].cur;
873 rfkill_set_block(rfkill, cur);
874 mutex_unlock(&rfkill_global_mutex);
877 int __must_check rfkill_register(struct rfkill *rfkill)
879 static unsigned long rfkill_no;
880 struct device *dev = &rfkill->dev;
885 mutex_lock(&rfkill_global_mutex);
887 if (rfkill->registered) {
892 rfkill->idx = rfkill_no;
893 dev_set_name(dev, "rfkill%lu", rfkill_no);
896 list_add_tail(&rfkill->node, &rfkill_list);
898 error = device_add(dev);
902 error = rfkill_led_trigger_register(rfkill);
906 rfkill->registered = true;
908 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
909 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
910 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
912 if (rfkill->ops->poll)
913 schedule_delayed_work(&rfkill->poll_work,
914 round_jiffies_relative(POLL_INTERVAL));
916 if (!rfkill->persistent || rfkill_epo_lock_active) {
917 schedule_work(&rfkill->sync_work);
919 #ifdef CONFIG_RFKILL_INPUT
920 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
922 if (!atomic_read(&rfkill_input_disabled))
923 __rfkill_switch_all(rfkill->type, soft_blocked);
927 rfkill_send_events(rfkill, RFKILL_OP_ADD);
929 mutex_unlock(&rfkill_global_mutex);
933 device_del(&rfkill->dev);
935 list_del_init(&rfkill->node);
937 mutex_unlock(&rfkill_global_mutex);
940 EXPORT_SYMBOL(rfkill_register);
942 void rfkill_unregister(struct rfkill *rfkill)
946 if (rfkill->ops->poll)
947 cancel_delayed_work_sync(&rfkill->poll_work);
949 cancel_work_sync(&rfkill->uevent_work);
950 cancel_work_sync(&rfkill->sync_work);
952 rfkill->registered = false;
954 device_del(&rfkill->dev);
956 mutex_lock(&rfkill_global_mutex);
957 rfkill_send_events(rfkill, RFKILL_OP_DEL);
958 list_del_init(&rfkill->node);
959 mutex_unlock(&rfkill_global_mutex);
961 rfkill_led_trigger_unregister(rfkill);
963 EXPORT_SYMBOL(rfkill_unregister);
965 void rfkill_destroy(struct rfkill *rfkill)
968 put_device(&rfkill->dev);
970 EXPORT_SYMBOL(rfkill_destroy);
972 static int rfkill_fop_open(struct inode *inode, struct file *file)
974 struct rfkill_data *data;
975 struct rfkill *rfkill;
976 struct rfkill_int_event *ev, *tmp;
978 data = kzalloc(sizeof(*data), GFP_KERNEL);
982 INIT_LIST_HEAD(&data->events);
983 mutex_init(&data->mtx);
984 init_waitqueue_head(&data->read_wait);
986 mutex_lock(&rfkill_global_mutex);
987 mutex_lock(&data->mtx);
989 * start getting events from elsewhere but hold mtx to get
990 * startup events added first
992 list_add(&data->list, &rfkill_fds);
994 list_for_each_entry(rfkill, &rfkill_list, node) {
995 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
998 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
999 list_add_tail(&ev->list, &data->events);
1001 mutex_unlock(&data->mtx);
1002 mutex_unlock(&rfkill_global_mutex);
1004 file->private_data = data;
1006 return nonseekable_open(inode, file);
1009 mutex_unlock(&data->mtx);
1010 mutex_unlock(&rfkill_global_mutex);
1011 mutex_destroy(&data->mtx);
1012 list_for_each_entry_safe(ev, tmp, &data->events, list)
1018 static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1020 struct rfkill_data *data = file->private_data;
1021 unsigned int res = POLLOUT | POLLWRNORM;
1023 poll_wait(file, &data->read_wait, wait);
1025 mutex_lock(&data->mtx);
1026 if (!list_empty(&data->events))
1027 res = POLLIN | POLLRDNORM;
1028 mutex_unlock(&data->mtx);
1033 static bool rfkill_readable(struct rfkill_data *data)
1037 mutex_lock(&data->mtx);
1038 r = !list_empty(&data->events);
1039 mutex_unlock(&data->mtx);
1044 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1045 size_t count, loff_t *pos)
1047 struct rfkill_data *data = file->private_data;
1048 struct rfkill_int_event *ev;
1052 mutex_lock(&data->mtx);
1054 while (list_empty(&data->events)) {
1055 if (file->f_flags & O_NONBLOCK) {
1059 mutex_unlock(&data->mtx);
1060 ret = wait_event_interruptible(data->read_wait,
1061 rfkill_readable(data));
1062 mutex_lock(&data->mtx);
1068 ev = list_first_entry(&data->events, struct rfkill_int_event,
1071 sz = min_t(unsigned long, sizeof(ev->ev), count);
1073 if (copy_to_user(buf, &ev->ev, sz))
1076 list_del(&ev->list);
1079 mutex_unlock(&data->mtx);
1083 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1084 size_t count, loff_t *pos)
1086 struct rfkill *rfkill;
1087 struct rfkill_event ev;
1089 /* we don't need the 'hard' variable but accept it */
1090 if (count < sizeof(ev) - 1)
1093 if (copy_from_user(&ev, buf, sizeof(ev) - 1))
1096 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1099 if (ev.type >= NUM_RFKILL_TYPES)
1102 mutex_lock(&rfkill_global_mutex);
1104 if (ev.op == RFKILL_OP_CHANGE_ALL) {
1105 if (ev.type == RFKILL_TYPE_ALL) {
1107 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1108 rfkill_global_states[i].cur = ev.soft;
1110 rfkill_global_states[ev.type].cur = ev.soft;
1114 list_for_each_entry(rfkill, &rfkill_list, node) {
1115 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1118 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1121 rfkill_set_block(rfkill, ev.soft);
1123 mutex_unlock(&rfkill_global_mutex);
1128 static int rfkill_fop_release(struct inode *inode, struct file *file)
1130 struct rfkill_data *data = file->private_data;
1131 struct rfkill_int_event *ev, *tmp;
1133 mutex_lock(&rfkill_global_mutex);
1134 list_del(&data->list);
1135 mutex_unlock(&rfkill_global_mutex);
1137 mutex_destroy(&data->mtx);
1138 list_for_each_entry_safe(ev, tmp, &data->events, list)
1141 #ifdef CONFIG_RFKILL_INPUT
1142 if (data->input_handler)
1143 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1144 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1152 #ifdef CONFIG_RFKILL_INPUT
1153 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1156 struct rfkill_data *data = file->private_data;
1158 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1161 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1164 mutex_lock(&data->mtx);
1166 if (!data->input_handler) {
1167 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1168 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1169 data->input_handler = true;
1172 mutex_unlock(&data->mtx);
1178 static const struct file_operations rfkill_fops = {
1179 .open = rfkill_fop_open,
1180 .read = rfkill_fop_read,
1181 .write = rfkill_fop_write,
1182 .poll = rfkill_fop_poll,
1183 .release = rfkill_fop_release,
1184 #ifdef CONFIG_RFKILL_INPUT
1185 .unlocked_ioctl = rfkill_fop_ioctl,
1186 .compat_ioctl = rfkill_fop_ioctl,
1190 static struct miscdevice rfkill_miscdev = {
1192 .fops = &rfkill_fops,
1193 .minor = MISC_DYNAMIC_MINOR,
1196 static int __init rfkill_init(void)
1201 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1202 rfkill_global_states[i].cur = !rfkill_default_state;
1204 error = class_register(&rfkill_class);
1208 error = misc_register(&rfkill_miscdev);
1210 class_unregister(&rfkill_class);
1214 #ifdef CONFIG_RFKILL_INPUT
1215 error = rfkill_handler_init();
1217 misc_deregister(&rfkill_miscdev);
1218 class_unregister(&rfkill_class);
1226 subsys_initcall(rfkill_init);
1228 static void __exit rfkill_exit(void)
1230 #ifdef CONFIG_RFKILL_INPUT
1231 rfkill_handler_exit();
1233 misc_deregister(&rfkill_miscdev);
1234 class_unregister(&rfkill_class);
1236 module_exit(rfkill_exit);