1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2006 - 2007 Ivo van Doorn
4 * Copyright (C) 2007 Dmitry Torokhov
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/workqueue.h>
12 #include <linux/capability.h>
13 #include <linux/list.h>
14 #include <linux/mutex.h>
15 #include <linux/rfkill.h>
16 #include <linux/sched.h>
17 #include <linux/spinlock.h>
18 #include <linux/device.h>
19 #include <linux/miscdevice.h>
20 #include <linux/wait.h>
21 #include <linux/poll.h>
23 #include <linux/slab.h>
27 #define POLL_INTERVAL (5 * HZ)
29 #define RFKILL_BLOCK_HW BIT(0)
30 #define RFKILL_BLOCK_SW BIT(1)
31 #define RFKILL_BLOCK_SW_PREV BIT(2)
32 #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
35 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
40 enum rfkill_type type;
43 unsigned long hard_block_reasons;
52 const struct rfkill_ops *ops;
55 #ifdef CONFIG_RFKILL_LEDS
56 struct led_trigger led_trigger;
57 const char *ledtrigname;
61 struct list_head node;
63 struct delayed_work poll_work;
64 struct work_struct uevent_work;
65 struct work_struct sync_work;
68 #define to_rfkill(d) container_of(d, struct rfkill, dev)
70 struct rfkill_int_event {
71 struct list_head list;
72 struct rfkill_event ev;
76 struct list_head list;
77 struct list_head events;
79 wait_queue_head_t read_wait;
84 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
85 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
86 MODULE_DESCRIPTION("RF switch support");
87 MODULE_LICENSE("GPL");
91 * The locking here should be made much smarter, we currently have
92 * a bit of a stupid situation because drivers might want to register
93 * the rfkill struct under their own lock, and take this lock during
94 * rfkill method calls -- which will cause an AB-BA deadlock situation.
96 * To fix that, we need to rework this code here to be mostly lock-free
97 * and only use the mutex for list manipulations, not to protect the
98 * various other global variables. Then we can avoid holding the mutex
99 * around driver operations, and all is happy.
101 static LIST_HEAD(rfkill_list); /* list of registered rf switches */
102 static DEFINE_MUTEX(rfkill_global_mutex);
103 static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
105 static unsigned int rfkill_default_state = 1;
106 module_param_named(default_state, rfkill_default_state, uint, 0444);
107 MODULE_PARM_DESC(default_state,
108 "Default initial state for all radio types, 0 = radio off");
112 } rfkill_global_states[NUM_RFKILL_TYPES];
114 static bool rfkill_epo_lock_active;
117 #ifdef CONFIG_RFKILL_LEDS
118 static void rfkill_led_trigger_event(struct rfkill *rfkill)
120 struct led_trigger *trigger;
122 if (!rfkill->registered)
125 trigger = &rfkill->led_trigger;
127 if (rfkill->state & RFKILL_BLOCK_ANY)
128 led_trigger_event(trigger, LED_OFF);
130 led_trigger_event(trigger, LED_FULL);
133 static int rfkill_led_trigger_activate(struct led_classdev *led)
135 struct rfkill *rfkill;
137 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
139 rfkill_led_trigger_event(rfkill);
144 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
146 return rfkill->led_trigger.name;
148 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
150 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
154 rfkill->ledtrigname = name;
156 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
158 static int rfkill_led_trigger_register(struct rfkill *rfkill)
160 rfkill->led_trigger.name = rfkill->ledtrigname
161 ? : dev_name(&rfkill->dev);
162 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
163 return led_trigger_register(&rfkill->led_trigger);
166 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
168 led_trigger_unregister(&rfkill->led_trigger);
171 static struct led_trigger rfkill_any_led_trigger;
172 static struct led_trigger rfkill_none_led_trigger;
173 static struct work_struct rfkill_global_led_trigger_work;
175 static void rfkill_global_led_trigger_worker(struct work_struct *work)
177 enum led_brightness brightness = LED_OFF;
178 struct rfkill *rfkill;
180 mutex_lock(&rfkill_global_mutex);
181 list_for_each_entry(rfkill, &rfkill_list, node) {
182 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
183 brightness = LED_FULL;
187 mutex_unlock(&rfkill_global_mutex);
189 led_trigger_event(&rfkill_any_led_trigger, brightness);
190 led_trigger_event(&rfkill_none_led_trigger,
191 brightness == LED_OFF ? LED_FULL : LED_OFF);
194 static void rfkill_global_led_trigger_event(void)
196 schedule_work(&rfkill_global_led_trigger_work);
199 static int rfkill_global_led_trigger_register(void)
203 INIT_WORK(&rfkill_global_led_trigger_work,
204 rfkill_global_led_trigger_worker);
206 rfkill_any_led_trigger.name = "rfkill-any";
207 ret = led_trigger_register(&rfkill_any_led_trigger);
211 rfkill_none_led_trigger.name = "rfkill-none";
212 ret = led_trigger_register(&rfkill_none_led_trigger);
214 led_trigger_unregister(&rfkill_any_led_trigger);
216 /* Delay activation until all global triggers are registered */
217 rfkill_global_led_trigger_event();
222 static void rfkill_global_led_trigger_unregister(void)
224 led_trigger_unregister(&rfkill_none_led_trigger);
225 led_trigger_unregister(&rfkill_any_led_trigger);
226 cancel_work_sync(&rfkill_global_led_trigger_work);
229 static void rfkill_led_trigger_event(struct rfkill *rfkill)
233 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
238 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
242 static void rfkill_global_led_trigger_event(void)
246 static int rfkill_global_led_trigger_register(void)
251 static void rfkill_global_led_trigger_unregister(void)
254 #endif /* CONFIG_RFKILL_LEDS */
256 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
257 enum rfkill_operation op)
261 ev->idx = rfkill->idx;
262 ev->type = rfkill->type;
265 spin_lock_irqsave(&rfkill->lock, flags);
266 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
267 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
268 RFKILL_BLOCK_SW_PREV));
269 ev->hard_block_reasons = rfkill->hard_block_reasons;
270 spin_unlock_irqrestore(&rfkill->lock, flags);
273 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
275 struct rfkill_data *data;
276 struct rfkill_int_event *ev;
278 list_for_each_entry(data, &rfkill_fds, list) {
279 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
282 rfkill_fill_event(&ev->ev, rfkill, op);
283 mutex_lock(&data->mtx);
284 list_add_tail(&ev->list, &data->events);
285 mutex_unlock(&data->mtx);
286 wake_up_interruptible(&data->read_wait);
290 static void rfkill_event(struct rfkill *rfkill)
292 if (!rfkill->registered)
295 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
297 /* also send event to /dev/rfkill */
298 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
302 * rfkill_set_block - wrapper for set_block method
304 * @rfkill: the rfkill struct to use
305 * @blocked: the new software state
307 * Calls the set_block method (when applicable) and handles notifications
310 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
316 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
320 * Some platforms (...!) generate input events which affect the
321 * _hard_ kill state -- whenever something tries to change the
322 * current software state query the hardware state too.
324 if (rfkill->ops->query)
325 rfkill->ops->query(rfkill, rfkill->data);
327 spin_lock_irqsave(&rfkill->lock, flags);
328 prev = rfkill->state & RFKILL_BLOCK_SW;
331 rfkill->state |= RFKILL_BLOCK_SW_PREV;
333 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
336 rfkill->state |= RFKILL_BLOCK_SW;
338 rfkill->state &= ~RFKILL_BLOCK_SW;
340 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
341 spin_unlock_irqrestore(&rfkill->lock, flags);
343 err = rfkill->ops->set_block(rfkill->data, blocked);
345 spin_lock_irqsave(&rfkill->lock, flags);
348 * Failed -- reset status to _PREV, which may be different
349 * from what we have set _PREV to earlier in this function
350 * if rfkill_set_sw_state was invoked.
352 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
353 rfkill->state |= RFKILL_BLOCK_SW;
355 rfkill->state &= ~RFKILL_BLOCK_SW;
357 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
358 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
359 curr = rfkill->state & RFKILL_BLOCK_SW;
360 spin_unlock_irqrestore(&rfkill->lock, flags);
362 rfkill_led_trigger_event(rfkill);
363 rfkill_global_led_trigger_event();
366 rfkill_event(rfkill);
369 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
373 if (type != RFKILL_TYPE_ALL) {
374 rfkill_global_states[type].cur = blocked;
378 for (i = 0; i < NUM_RFKILL_TYPES; i++)
379 rfkill_global_states[i].cur = blocked;
382 #ifdef CONFIG_RFKILL_INPUT
383 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
386 * __rfkill_switch_all - Toggle state of all switches of given type
387 * @type: type of interfaces to be affected
388 * @blocked: the new state
390 * This function sets the state of all switches of given type,
391 * unless a specific switch is suspended.
393 * Caller must have acquired rfkill_global_mutex.
395 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
397 struct rfkill *rfkill;
399 rfkill_update_global_state(type, blocked);
400 list_for_each_entry(rfkill, &rfkill_list, node) {
401 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
404 rfkill_set_block(rfkill, blocked);
409 * rfkill_switch_all - Toggle state of all switches of given type
410 * @type: type of interfaces to be affected
411 * @blocked: the new state
413 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
414 * Please refer to __rfkill_switch_all() for details.
416 * Does nothing if the EPO lock is active.
418 void rfkill_switch_all(enum rfkill_type type, bool blocked)
420 if (atomic_read(&rfkill_input_disabled))
423 mutex_lock(&rfkill_global_mutex);
425 if (!rfkill_epo_lock_active)
426 __rfkill_switch_all(type, blocked);
428 mutex_unlock(&rfkill_global_mutex);
432 * rfkill_epo - emergency power off all transmitters
434 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
435 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
437 * The global state before the EPO is saved and can be restored later
438 * using rfkill_restore_states().
440 void rfkill_epo(void)
442 struct rfkill *rfkill;
445 if (atomic_read(&rfkill_input_disabled))
448 mutex_lock(&rfkill_global_mutex);
450 rfkill_epo_lock_active = true;
451 list_for_each_entry(rfkill, &rfkill_list, node)
452 rfkill_set_block(rfkill, true);
454 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
455 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
456 rfkill_global_states[i].cur = true;
459 mutex_unlock(&rfkill_global_mutex);
463 * rfkill_restore_states - restore global states
465 * Restore (and sync switches to) the global state from the
466 * states in rfkill_default_states. This can undo the effects of
467 * a call to rfkill_epo().
469 void rfkill_restore_states(void)
473 if (atomic_read(&rfkill_input_disabled))
476 mutex_lock(&rfkill_global_mutex);
478 rfkill_epo_lock_active = false;
479 for (i = 0; i < NUM_RFKILL_TYPES; i++)
480 __rfkill_switch_all(i, rfkill_global_states[i].sav);
481 mutex_unlock(&rfkill_global_mutex);
485 * rfkill_remove_epo_lock - unlock state changes
487 * Used by rfkill-input manually unlock state changes, when
488 * the EPO switch is deactivated.
490 void rfkill_remove_epo_lock(void)
492 if (atomic_read(&rfkill_input_disabled))
495 mutex_lock(&rfkill_global_mutex);
496 rfkill_epo_lock_active = false;
497 mutex_unlock(&rfkill_global_mutex);
501 * rfkill_is_epo_lock_active - returns true EPO is active
503 * Returns 0 (false) if there is NOT an active EPO condition,
504 * and 1 (true) if there is an active EPO condition, which
505 * locks all radios in one of the BLOCKED states.
507 * Can be called in atomic context.
509 bool rfkill_is_epo_lock_active(void)
511 return rfkill_epo_lock_active;
515 * rfkill_get_global_sw_state - returns global state for a type
516 * @type: the type to get the global state of
518 * Returns the current global state for a given wireless
521 bool rfkill_get_global_sw_state(const enum rfkill_type type)
523 return rfkill_global_states[type].cur;
527 bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
528 bool blocked, unsigned long reason)
536 ~(RFKILL_HARD_BLOCK_SIGNAL | RFKILL_HARD_BLOCK_NOT_OWNER),
537 "hw_state reason not supported: 0x%lx", reason))
540 spin_lock_irqsave(&rfkill->lock, flags);
541 prev = !!(rfkill->hard_block_reasons & reason);
543 rfkill->state |= RFKILL_BLOCK_HW;
544 rfkill->hard_block_reasons |= reason;
546 rfkill->hard_block_reasons &= ~reason;
547 if (!rfkill->hard_block_reasons)
548 rfkill->state &= ~RFKILL_BLOCK_HW;
550 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
551 spin_unlock_irqrestore(&rfkill->lock, flags);
553 rfkill_led_trigger_event(rfkill);
554 rfkill_global_led_trigger_event();
556 if (rfkill->registered && prev != blocked)
557 schedule_work(&rfkill->uevent_work);
561 EXPORT_SYMBOL(rfkill_set_hw_state_reason);
563 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
565 u32 bit = RFKILL_BLOCK_SW;
567 /* if in a ops->set_block right now, use other bit */
568 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
569 bit = RFKILL_BLOCK_SW_PREV;
572 rfkill->state |= bit;
574 rfkill->state &= ~bit;
577 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
584 spin_lock_irqsave(&rfkill->lock, flags);
585 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
586 __rfkill_set_sw_state(rfkill, blocked);
587 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
588 blocked = blocked || hwblock;
589 spin_unlock_irqrestore(&rfkill->lock, flags);
591 if (!rfkill->registered)
594 if (prev != blocked && !hwblock)
595 schedule_work(&rfkill->uevent_work);
597 rfkill_led_trigger_event(rfkill);
598 rfkill_global_led_trigger_event();
602 EXPORT_SYMBOL(rfkill_set_sw_state);
604 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
609 BUG_ON(rfkill->registered);
611 spin_lock_irqsave(&rfkill->lock, flags);
612 __rfkill_set_sw_state(rfkill, blocked);
613 rfkill->persistent = true;
614 spin_unlock_irqrestore(&rfkill->lock, flags);
616 EXPORT_SYMBOL(rfkill_init_sw_state);
618 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
625 spin_lock_irqsave(&rfkill->lock, flags);
628 * No need to care about prev/setblock ... this is for uevent only
629 * and that will get triggered by rfkill_set_block anyway.
631 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
632 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
633 __rfkill_set_sw_state(rfkill, sw);
635 rfkill->state |= RFKILL_BLOCK_HW;
637 rfkill->state &= ~RFKILL_BLOCK_HW;
639 spin_unlock_irqrestore(&rfkill->lock, flags);
641 if (!rfkill->registered) {
642 rfkill->persistent = true;
644 if (swprev != sw || hwprev != hw)
645 schedule_work(&rfkill->uevent_work);
647 rfkill_led_trigger_event(rfkill);
648 rfkill_global_led_trigger_event();
651 EXPORT_SYMBOL(rfkill_set_states);
653 static const char * const rfkill_types[] = {
654 NULL, /* RFKILL_TYPE_ALL */
665 enum rfkill_type rfkill_find_type(const char *name)
669 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
672 return RFKILL_TYPE_ALL;
674 for (i = 1; i < NUM_RFKILL_TYPES; i++)
675 if (!strcmp(name, rfkill_types[i]))
677 return RFKILL_TYPE_ALL;
679 EXPORT_SYMBOL(rfkill_find_type);
681 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
684 struct rfkill *rfkill = to_rfkill(dev);
686 return sprintf(buf, "%s\n", rfkill->name);
688 static DEVICE_ATTR_RO(name);
690 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
693 struct rfkill *rfkill = to_rfkill(dev);
695 return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
697 static DEVICE_ATTR_RO(type);
699 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
702 struct rfkill *rfkill = to_rfkill(dev);
704 return sprintf(buf, "%d\n", rfkill->idx);
706 static DEVICE_ATTR_RO(index);
708 static ssize_t persistent_show(struct device *dev,
709 struct device_attribute *attr, char *buf)
711 struct rfkill *rfkill = to_rfkill(dev);
713 return sprintf(buf, "%d\n", rfkill->persistent);
715 static DEVICE_ATTR_RO(persistent);
717 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
720 struct rfkill *rfkill = to_rfkill(dev);
722 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
724 static DEVICE_ATTR_RO(hard);
726 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
729 struct rfkill *rfkill = to_rfkill(dev);
731 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
734 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
735 const char *buf, size_t count)
737 struct rfkill *rfkill = to_rfkill(dev);
741 if (!capable(CAP_NET_ADMIN))
744 err = kstrtoul(buf, 0, &state);
751 mutex_lock(&rfkill_global_mutex);
752 rfkill_set_block(rfkill, state);
753 mutex_unlock(&rfkill_global_mutex);
757 static DEVICE_ATTR_RW(soft);
759 static ssize_t hard_block_reasons_show(struct device *dev,
760 struct device_attribute *attr,
763 struct rfkill *rfkill = to_rfkill(dev);
765 return sprintf(buf, "0x%lx\n", rfkill->hard_block_reasons);
767 static DEVICE_ATTR_RO(hard_block_reasons);
769 static u8 user_state_from_blocked(unsigned long state)
771 if (state & RFKILL_BLOCK_HW)
772 return RFKILL_USER_STATE_HARD_BLOCKED;
773 if (state & RFKILL_BLOCK_SW)
774 return RFKILL_USER_STATE_SOFT_BLOCKED;
776 return RFKILL_USER_STATE_UNBLOCKED;
779 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
782 struct rfkill *rfkill = to_rfkill(dev);
784 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
787 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
788 const char *buf, size_t count)
790 struct rfkill *rfkill = to_rfkill(dev);
794 if (!capable(CAP_NET_ADMIN))
797 err = kstrtoul(buf, 0, &state);
801 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
802 state != RFKILL_USER_STATE_UNBLOCKED)
805 mutex_lock(&rfkill_global_mutex);
806 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
807 mutex_unlock(&rfkill_global_mutex);
811 static DEVICE_ATTR_RW(state);
813 static struct attribute *rfkill_dev_attrs[] = {
816 &dev_attr_index.attr,
817 &dev_attr_persistent.attr,
818 &dev_attr_state.attr,
821 &dev_attr_hard_block_reasons.attr,
824 ATTRIBUTE_GROUPS(rfkill_dev);
826 static void rfkill_release(struct device *dev)
828 struct rfkill *rfkill = to_rfkill(dev);
833 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
835 struct rfkill *rfkill = to_rfkill(dev);
837 unsigned long reasons;
841 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
844 error = add_uevent_var(env, "RFKILL_TYPE=%s",
845 rfkill_types[rfkill->type]);
848 spin_lock_irqsave(&rfkill->lock, flags);
849 state = rfkill->state;
850 reasons = rfkill->hard_block_reasons;
851 spin_unlock_irqrestore(&rfkill->lock, flags);
852 error = add_uevent_var(env, "RFKILL_STATE=%d",
853 user_state_from_blocked(state));
856 return add_uevent_var(env, "RFKILL_HW_BLOCK_REASON=0x%lx", reasons);
859 void rfkill_pause_polling(struct rfkill *rfkill)
863 if (!rfkill->ops->poll)
866 rfkill->polling_paused = true;
867 cancel_delayed_work_sync(&rfkill->poll_work);
869 EXPORT_SYMBOL(rfkill_pause_polling);
871 void rfkill_resume_polling(struct rfkill *rfkill)
875 if (!rfkill->ops->poll)
878 rfkill->polling_paused = false;
880 if (rfkill->suspended)
883 queue_delayed_work(system_power_efficient_wq,
884 &rfkill->poll_work, 0);
886 EXPORT_SYMBOL(rfkill_resume_polling);
888 #ifdef CONFIG_PM_SLEEP
889 static int rfkill_suspend(struct device *dev)
891 struct rfkill *rfkill = to_rfkill(dev);
893 rfkill->suspended = true;
894 cancel_delayed_work_sync(&rfkill->poll_work);
899 static int rfkill_resume(struct device *dev)
901 struct rfkill *rfkill = to_rfkill(dev);
904 rfkill->suspended = false;
906 if (!rfkill->registered)
909 if (!rfkill->persistent) {
910 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
911 rfkill_set_block(rfkill, cur);
914 if (rfkill->ops->poll && !rfkill->polling_paused)
915 queue_delayed_work(system_power_efficient_wq,
916 &rfkill->poll_work, 0);
921 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
922 #define RFKILL_PM_OPS (&rfkill_pm_ops)
924 #define RFKILL_PM_OPS NULL
927 static struct class rfkill_class = {
929 .dev_release = rfkill_release,
930 .dev_groups = rfkill_dev_groups,
931 .dev_uevent = rfkill_dev_uevent,
935 bool rfkill_blocked(struct rfkill *rfkill)
940 spin_lock_irqsave(&rfkill->lock, flags);
941 state = rfkill->state;
942 spin_unlock_irqrestore(&rfkill->lock, flags);
944 return !!(state & RFKILL_BLOCK_ANY);
946 EXPORT_SYMBOL(rfkill_blocked);
949 struct rfkill * __must_check rfkill_alloc(const char *name,
950 struct device *parent,
951 const enum rfkill_type type,
952 const struct rfkill_ops *ops,
955 struct rfkill *rfkill;
961 if (WARN_ON(!ops->set_block))
967 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
970 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
974 spin_lock_init(&rfkill->lock);
975 INIT_LIST_HEAD(&rfkill->node);
977 strcpy(rfkill->name, name);
979 rfkill->data = ops_data;
982 dev->class = &rfkill_class;
983 dev->parent = parent;
984 device_initialize(dev);
988 EXPORT_SYMBOL(rfkill_alloc);
990 static void rfkill_poll(struct work_struct *work)
992 struct rfkill *rfkill;
994 rfkill = container_of(work, struct rfkill, poll_work.work);
997 * Poll hardware state -- driver will use one of the
998 * rfkill_set{,_hw,_sw}_state functions and use its
999 * return value to update the current status.
1001 rfkill->ops->poll(rfkill, rfkill->data);
1003 queue_delayed_work(system_power_efficient_wq,
1005 round_jiffies_relative(POLL_INTERVAL));
1008 static void rfkill_uevent_work(struct work_struct *work)
1010 struct rfkill *rfkill;
1012 rfkill = container_of(work, struct rfkill, uevent_work);
1014 mutex_lock(&rfkill_global_mutex);
1015 rfkill_event(rfkill);
1016 mutex_unlock(&rfkill_global_mutex);
1019 static void rfkill_sync_work(struct work_struct *work)
1021 struct rfkill *rfkill;
1024 rfkill = container_of(work, struct rfkill, sync_work);
1026 mutex_lock(&rfkill_global_mutex);
1027 cur = rfkill_global_states[rfkill->type].cur;
1028 rfkill_set_block(rfkill, cur);
1029 mutex_unlock(&rfkill_global_mutex);
1032 int __must_check rfkill_register(struct rfkill *rfkill)
1034 static unsigned long rfkill_no;
1043 mutex_lock(&rfkill_global_mutex);
1045 if (rfkill->registered) {
1050 rfkill->idx = rfkill_no;
1051 dev_set_name(dev, "rfkill%lu", rfkill_no);
1054 list_add_tail(&rfkill->node, &rfkill_list);
1056 error = device_add(dev);
1060 error = rfkill_led_trigger_register(rfkill);
1064 rfkill->registered = true;
1066 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1067 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1068 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1070 if (rfkill->ops->poll)
1071 queue_delayed_work(system_power_efficient_wq,
1073 round_jiffies_relative(POLL_INTERVAL));
1075 if (!rfkill->persistent || rfkill_epo_lock_active) {
1076 schedule_work(&rfkill->sync_work);
1078 #ifdef CONFIG_RFKILL_INPUT
1079 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1081 if (!atomic_read(&rfkill_input_disabled))
1082 __rfkill_switch_all(rfkill->type, soft_blocked);
1086 rfkill_global_led_trigger_event();
1087 rfkill_send_events(rfkill, RFKILL_OP_ADD);
1089 mutex_unlock(&rfkill_global_mutex);
1093 device_del(&rfkill->dev);
1095 list_del_init(&rfkill->node);
1097 mutex_unlock(&rfkill_global_mutex);
1100 EXPORT_SYMBOL(rfkill_register);
1102 void rfkill_unregister(struct rfkill *rfkill)
1106 if (rfkill->ops->poll)
1107 cancel_delayed_work_sync(&rfkill->poll_work);
1109 cancel_work_sync(&rfkill->uevent_work);
1110 cancel_work_sync(&rfkill->sync_work);
1112 rfkill->registered = false;
1114 device_del(&rfkill->dev);
1116 mutex_lock(&rfkill_global_mutex);
1117 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1118 list_del_init(&rfkill->node);
1119 rfkill_global_led_trigger_event();
1120 mutex_unlock(&rfkill_global_mutex);
1122 rfkill_led_trigger_unregister(rfkill);
1124 EXPORT_SYMBOL(rfkill_unregister);
1126 void rfkill_destroy(struct rfkill *rfkill)
1129 put_device(&rfkill->dev);
1131 EXPORT_SYMBOL(rfkill_destroy);
1133 static int rfkill_fop_open(struct inode *inode, struct file *file)
1135 struct rfkill_data *data;
1136 struct rfkill *rfkill;
1137 struct rfkill_int_event *ev, *tmp;
1139 data = kzalloc(sizeof(*data), GFP_KERNEL);
1143 INIT_LIST_HEAD(&data->events);
1144 mutex_init(&data->mtx);
1145 init_waitqueue_head(&data->read_wait);
1147 mutex_lock(&rfkill_global_mutex);
1148 mutex_lock(&data->mtx);
1150 * start getting events from elsewhere but hold mtx to get
1151 * startup events added first
1154 list_for_each_entry(rfkill, &rfkill_list, node) {
1155 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1158 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1159 list_add_tail(&ev->list, &data->events);
1161 list_add(&data->list, &rfkill_fds);
1162 mutex_unlock(&data->mtx);
1163 mutex_unlock(&rfkill_global_mutex);
1165 file->private_data = data;
1167 return stream_open(inode, file);
1170 mutex_unlock(&data->mtx);
1171 mutex_unlock(&rfkill_global_mutex);
1172 mutex_destroy(&data->mtx);
1173 list_for_each_entry_safe(ev, tmp, &data->events, list)
1179 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1181 struct rfkill_data *data = file->private_data;
1182 __poll_t res = EPOLLOUT | EPOLLWRNORM;
1184 poll_wait(file, &data->read_wait, wait);
1186 mutex_lock(&data->mtx);
1187 if (!list_empty(&data->events))
1188 res = EPOLLIN | EPOLLRDNORM;
1189 mutex_unlock(&data->mtx);
1194 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1195 size_t count, loff_t *pos)
1197 struct rfkill_data *data = file->private_data;
1198 struct rfkill_int_event *ev;
1202 mutex_lock(&data->mtx);
1204 while (list_empty(&data->events)) {
1205 if (file->f_flags & O_NONBLOCK) {
1209 mutex_unlock(&data->mtx);
1210 /* since we re-check and it just compares pointers,
1211 * using !list_empty() without locking isn't a problem
1213 ret = wait_event_interruptible(data->read_wait,
1214 !list_empty(&data->events));
1215 mutex_lock(&data->mtx);
1221 ev = list_first_entry(&data->events, struct rfkill_int_event,
1224 sz = min_t(unsigned long, sizeof(ev->ev), count);
1226 if (copy_to_user(buf, &ev->ev, sz))
1229 list_del(&ev->list);
1232 mutex_unlock(&data->mtx);
1236 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1237 size_t count, loff_t *pos)
1239 struct rfkill *rfkill;
1240 struct rfkill_event ev;
1243 /* we don't need the 'hard' variable but accept it */
1244 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1248 * Copy as much data as we can accept into our 'ev' buffer,
1249 * but tell userspace how much we've copied so it can determine
1250 * our API version even in a write() call, if it cares.
1252 count = min(count, sizeof(ev));
1253 if (copy_from_user(&ev, buf, count))
1256 if (ev.type >= NUM_RFKILL_TYPES)
1259 mutex_lock(&rfkill_global_mutex);
1262 case RFKILL_OP_CHANGE_ALL:
1263 rfkill_update_global_state(ev.type, ev.soft);
1264 list_for_each_entry(rfkill, &rfkill_list, node)
1265 if (rfkill->type == ev.type ||
1266 ev.type == RFKILL_TYPE_ALL)
1267 rfkill_set_block(rfkill, ev.soft);
1270 case RFKILL_OP_CHANGE:
1271 list_for_each_entry(rfkill, &rfkill_list, node)
1272 if (rfkill->idx == ev.idx &&
1273 (rfkill->type == ev.type ||
1274 ev.type == RFKILL_TYPE_ALL))
1275 rfkill_set_block(rfkill, ev.soft);
1283 mutex_unlock(&rfkill_global_mutex);
1285 return ret ?: count;
1288 static int rfkill_fop_release(struct inode *inode, struct file *file)
1290 struct rfkill_data *data = file->private_data;
1291 struct rfkill_int_event *ev, *tmp;
1293 mutex_lock(&rfkill_global_mutex);
1294 list_del(&data->list);
1295 mutex_unlock(&rfkill_global_mutex);
1297 mutex_destroy(&data->mtx);
1298 list_for_each_entry_safe(ev, tmp, &data->events, list)
1301 #ifdef CONFIG_RFKILL_INPUT
1302 if (data->input_handler)
1303 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1304 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1312 #ifdef CONFIG_RFKILL_INPUT
1313 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1316 struct rfkill_data *data = file->private_data;
1318 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1321 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1324 mutex_lock(&data->mtx);
1326 if (!data->input_handler) {
1327 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1328 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1329 data->input_handler = true;
1332 mutex_unlock(&data->mtx);
1338 static const struct file_operations rfkill_fops = {
1339 .owner = THIS_MODULE,
1340 .open = rfkill_fop_open,
1341 .read = rfkill_fop_read,
1342 .write = rfkill_fop_write,
1343 .poll = rfkill_fop_poll,
1344 .release = rfkill_fop_release,
1345 #ifdef CONFIG_RFKILL_INPUT
1346 .unlocked_ioctl = rfkill_fop_ioctl,
1347 .compat_ioctl = compat_ptr_ioctl,
1349 .llseek = no_llseek,
1352 #define RFKILL_NAME "rfkill"
1354 static struct miscdevice rfkill_miscdev = {
1355 .fops = &rfkill_fops,
1356 .name = RFKILL_NAME,
1357 .minor = RFKILL_MINOR,
1360 static int __init rfkill_init(void)
1364 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1366 error = class_register(&rfkill_class);
1370 error = misc_register(&rfkill_miscdev);
1374 error = rfkill_global_led_trigger_register();
1376 goto error_led_trigger;
1378 #ifdef CONFIG_RFKILL_INPUT
1379 error = rfkill_handler_init();
1386 #ifdef CONFIG_RFKILL_INPUT
1388 rfkill_global_led_trigger_unregister();
1391 misc_deregister(&rfkill_miscdev);
1393 class_unregister(&rfkill_class);
1397 subsys_initcall(rfkill_init);
1399 static void __exit rfkill_exit(void)
1401 #ifdef CONFIG_RFKILL_INPUT
1402 rfkill_handler_exit();
1404 rfkill_global_led_trigger_unregister();
1405 misc_deregister(&rfkill_miscdev);
1406 class_unregister(&rfkill_class);
1408 module_exit(rfkill_exit);
1410 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1411 MODULE_ALIAS("devname:" RFKILL_NAME);