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
;
51 const struct rfkill_ops
*ops
;
54 #ifdef CONFIG_RFKILL_LEDS
55 struct led_trigger led_trigger
;
56 const char *ledtrigname
;
60 struct list_head node
;
62 struct delayed_work poll_work
;
63 struct work_struct uevent_work
;
64 struct work_struct sync_work
;
67 #define to_rfkill(d) container_of(d, struct rfkill, dev)
69 struct rfkill_int_event
{
70 struct list_head list
;
71 struct rfkill_event ev
;
75 struct list_head list
;
76 struct list_head events
;
78 wait_queue_head_t read_wait
;
83 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
84 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
85 MODULE_DESCRIPTION("RF switch support");
86 MODULE_LICENSE("GPL");
90 * The locking here should be made much smarter, we currently have
91 * a bit of a stupid situation because drivers might want to register
92 * the rfkill struct under their own lock, and take this lock during
93 * rfkill method calls -- which will cause an AB-BA deadlock situation.
95 * To fix that, we need to rework this code here to be mostly lock-free
96 * and only use the mutex for list manipulations, not to protect the
97 * various other global variables. Then we can avoid holding the mutex
98 * around driver operations, and all is happy.
100 static LIST_HEAD(rfkill_list
); /* list of registered rf switches */
101 static DEFINE_MUTEX(rfkill_global_mutex
);
102 static LIST_HEAD(rfkill_fds
); /* list of open fds of /dev/rfkill */
104 static unsigned int rfkill_default_state
= 1;
105 module_param_named(default_state
, rfkill_default_state
, uint
, 0444);
106 MODULE_PARM_DESC(default_state
,
107 "Default initial state for all radio types, 0 = radio off");
111 } rfkill_global_states
[NUM_RFKILL_TYPES
];
113 static bool rfkill_epo_lock_active
;
116 #ifdef CONFIG_RFKILL_LEDS
117 static void rfkill_led_trigger_event(struct rfkill
*rfkill
)
119 struct led_trigger
*trigger
;
121 if (!rfkill
->registered
)
124 trigger
= &rfkill
->led_trigger
;
126 if (rfkill
->state
& RFKILL_BLOCK_ANY
)
127 led_trigger_event(trigger
, LED_OFF
);
129 led_trigger_event(trigger
, LED_FULL
);
132 static int rfkill_led_trigger_activate(struct led_classdev
*led
)
134 struct rfkill
*rfkill
;
136 rfkill
= container_of(led
->trigger
, struct rfkill
, led_trigger
);
138 rfkill_led_trigger_event(rfkill
);
143 const char *rfkill_get_led_trigger_name(struct rfkill
*rfkill
)
145 return rfkill
->led_trigger
.name
;
147 EXPORT_SYMBOL(rfkill_get_led_trigger_name
);
149 void rfkill_set_led_trigger_name(struct rfkill
*rfkill
, const char *name
)
153 rfkill
->ledtrigname
= name
;
155 EXPORT_SYMBOL(rfkill_set_led_trigger_name
);
157 static int rfkill_led_trigger_register(struct rfkill
*rfkill
)
159 rfkill
->led_trigger
.name
= rfkill
->ledtrigname
160 ? : dev_name(&rfkill
->dev
);
161 rfkill
->led_trigger
.activate
= rfkill_led_trigger_activate
;
162 return led_trigger_register(&rfkill
->led_trigger
);
165 static void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
167 led_trigger_unregister(&rfkill
->led_trigger
);
170 static struct led_trigger rfkill_any_led_trigger
;
171 static struct led_trigger rfkill_none_led_trigger
;
172 static struct work_struct rfkill_global_led_trigger_work
;
174 static void rfkill_global_led_trigger_worker(struct work_struct
*work
)
176 enum led_brightness brightness
= LED_OFF
;
177 struct rfkill
*rfkill
;
179 mutex_lock(&rfkill_global_mutex
);
180 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
181 if (!(rfkill
->state
& RFKILL_BLOCK_ANY
)) {
182 brightness
= LED_FULL
;
186 mutex_unlock(&rfkill_global_mutex
);
188 led_trigger_event(&rfkill_any_led_trigger
, brightness
);
189 led_trigger_event(&rfkill_none_led_trigger
,
190 brightness
== LED_OFF
? LED_FULL
: LED_OFF
);
193 static void rfkill_global_led_trigger_event(void)
195 schedule_work(&rfkill_global_led_trigger_work
);
198 static int rfkill_global_led_trigger_register(void)
202 INIT_WORK(&rfkill_global_led_trigger_work
,
203 rfkill_global_led_trigger_worker
);
205 rfkill_any_led_trigger
.name
= "rfkill-any";
206 ret
= led_trigger_register(&rfkill_any_led_trigger
);
210 rfkill_none_led_trigger
.name
= "rfkill-none";
211 ret
= led_trigger_register(&rfkill_none_led_trigger
);
213 led_trigger_unregister(&rfkill_any_led_trigger
);
215 /* Delay activation until all global triggers are registered */
216 rfkill_global_led_trigger_event();
221 static void rfkill_global_led_trigger_unregister(void)
223 led_trigger_unregister(&rfkill_none_led_trigger
);
224 led_trigger_unregister(&rfkill_any_led_trigger
);
225 cancel_work_sync(&rfkill_global_led_trigger_work
);
228 static void rfkill_led_trigger_event(struct rfkill
*rfkill
)
232 static inline int rfkill_led_trigger_register(struct rfkill
*rfkill
)
237 static inline void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
241 static void rfkill_global_led_trigger_event(void)
245 static int rfkill_global_led_trigger_register(void)
250 static void rfkill_global_led_trigger_unregister(void)
253 #endif /* CONFIG_RFKILL_LEDS */
255 static void rfkill_fill_event(struct rfkill_event
*ev
, struct rfkill
*rfkill
,
256 enum rfkill_operation op
)
260 ev
->idx
= rfkill
->idx
;
261 ev
->type
= rfkill
->type
;
264 spin_lock_irqsave(&rfkill
->lock
, flags
);
265 ev
->hard
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
266 ev
->soft
= !!(rfkill
->state
& (RFKILL_BLOCK_SW
|
267 RFKILL_BLOCK_SW_PREV
));
268 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
271 static void rfkill_send_events(struct rfkill
*rfkill
, enum rfkill_operation op
)
273 struct rfkill_data
*data
;
274 struct rfkill_int_event
*ev
;
276 list_for_each_entry(data
, &rfkill_fds
, list
) {
277 ev
= kzalloc(sizeof(*ev
), GFP_KERNEL
);
280 rfkill_fill_event(&ev
->ev
, rfkill
, op
);
281 mutex_lock(&data
->mtx
);
282 list_add_tail(&ev
->list
, &data
->events
);
283 mutex_unlock(&data
->mtx
);
284 wake_up_interruptible(&data
->read_wait
);
288 static void rfkill_event(struct rfkill
*rfkill
)
290 if (!rfkill
->registered
)
293 kobject_uevent(&rfkill
->dev
.kobj
, KOBJ_CHANGE
);
295 /* also send event to /dev/rfkill */
296 rfkill_send_events(rfkill
, RFKILL_OP_CHANGE
);
300 * rfkill_set_block - wrapper for set_block method
302 * @rfkill: the rfkill struct to use
303 * @blocked: the new software state
305 * Calls the set_block method (when applicable) and handles notifications
308 static void rfkill_set_block(struct rfkill
*rfkill
, bool blocked
)
314 if (unlikely(rfkill
->dev
.power
.power_state
.event
& PM_EVENT_SLEEP
))
318 * Some platforms (...!) generate input events which affect the
319 * _hard_ kill state -- whenever something tries to change the
320 * current software state query the hardware state too.
322 if (rfkill
->ops
->query
)
323 rfkill
->ops
->query(rfkill
, rfkill
->data
);
325 spin_lock_irqsave(&rfkill
->lock
, flags
);
326 prev
= rfkill
->state
& RFKILL_BLOCK_SW
;
329 rfkill
->state
|= RFKILL_BLOCK_SW_PREV
;
331 rfkill
->state
&= ~RFKILL_BLOCK_SW_PREV
;
334 rfkill
->state
|= RFKILL_BLOCK_SW
;
336 rfkill
->state
&= ~RFKILL_BLOCK_SW
;
338 rfkill
->state
|= RFKILL_BLOCK_SW_SETCALL
;
339 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
341 err
= rfkill
->ops
->set_block(rfkill
->data
, blocked
);
343 spin_lock_irqsave(&rfkill
->lock
, flags
);
346 * Failed -- reset status to _PREV, which may be different
347 * from what we have set _PREV to earlier in this function
348 * if rfkill_set_sw_state was invoked.
350 if (rfkill
->state
& RFKILL_BLOCK_SW_PREV
)
351 rfkill
->state
|= RFKILL_BLOCK_SW
;
353 rfkill
->state
&= ~RFKILL_BLOCK_SW
;
355 rfkill
->state
&= ~RFKILL_BLOCK_SW_SETCALL
;
356 rfkill
->state
&= ~RFKILL_BLOCK_SW_PREV
;
357 curr
= rfkill
->state
& RFKILL_BLOCK_SW
;
358 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
360 rfkill_led_trigger_event(rfkill
);
361 rfkill_global_led_trigger_event();
364 rfkill_event(rfkill
);
367 static void rfkill_update_global_state(enum rfkill_type type
, bool blocked
)
371 if (type
!= RFKILL_TYPE_ALL
) {
372 rfkill_global_states
[type
].cur
= blocked
;
376 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
377 rfkill_global_states
[i
].cur
= blocked
;
380 #ifdef CONFIG_RFKILL_INPUT
381 static atomic_t rfkill_input_disabled
= ATOMIC_INIT(0);
384 * __rfkill_switch_all - Toggle state of all switches of given type
385 * @type: type of interfaces to be affected
386 * @blocked: the new state
388 * This function sets the state of all switches of given type,
389 * unless a specific switch is suspended.
391 * Caller must have acquired rfkill_global_mutex.
393 static void __rfkill_switch_all(const enum rfkill_type type
, bool blocked
)
395 struct rfkill
*rfkill
;
397 rfkill_update_global_state(type
, blocked
);
398 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
399 if (rfkill
->type
!= type
&& type
!= RFKILL_TYPE_ALL
)
402 rfkill_set_block(rfkill
, blocked
);
407 * rfkill_switch_all - Toggle state of all switches of given type
408 * @type: type of interfaces to be affected
409 * @blocked: the new state
411 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
412 * Please refer to __rfkill_switch_all() for details.
414 * Does nothing if the EPO lock is active.
416 void rfkill_switch_all(enum rfkill_type type
, bool blocked
)
418 if (atomic_read(&rfkill_input_disabled
))
421 mutex_lock(&rfkill_global_mutex
);
423 if (!rfkill_epo_lock_active
)
424 __rfkill_switch_all(type
, blocked
);
426 mutex_unlock(&rfkill_global_mutex
);
430 * rfkill_epo - emergency power off all transmitters
432 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
433 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
435 * The global state before the EPO is saved and can be restored later
436 * using rfkill_restore_states().
438 void rfkill_epo(void)
440 struct rfkill
*rfkill
;
443 if (atomic_read(&rfkill_input_disabled
))
446 mutex_lock(&rfkill_global_mutex
);
448 rfkill_epo_lock_active
= true;
449 list_for_each_entry(rfkill
, &rfkill_list
, node
)
450 rfkill_set_block(rfkill
, true);
452 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++) {
453 rfkill_global_states
[i
].sav
= rfkill_global_states
[i
].cur
;
454 rfkill_global_states
[i
].cur
= true;
457 mutex_unlock(&rfkill_global_mutex
);
461 * rfkill_restore_states - restore global states
463 * Restore (and sync switches to) the global state from the
464 * states in rfkill_default_states. This can undo the effects of
465 * a call to rfkill_epo().
467 void rfkill_restore_states(void)
471 if (atomic_read(&rfkill_input_disabled
))
474 mutex_lock(&rfkill_global_mutex
);
476 rfkill_epo_lock_active
= false;
477 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
478 __rfkill_switch_all(i
, rfkill_global_states
[i
].sav
);
479 mutex_unlock(&rfkill_global_mutex
);
483 * rfkill_remove_epo_lock - unlock state changes
485 * Used by rfkill-input manually unlock state changes, when
486 * the EPO switch is deactivated.
488 void rfkill_remove_epo_lock(void)
490 if (atomic_read(&rfkill_input_disabled
))
493 mutex_lock(&rfkill_global_mutex
);
494 rfkill_epo_lock_active
= false;
495 mutex_unlock(&rfkill_global_mutex
);
499 * rfkill_is_epo_lock_active - returns true EPO is active
501 * Returns 0 (false) if there is NOT an active EPO condition,
502 * and 1 (true) if there is an active EPO condition, which
503 * locks all radios in one of the BLOCKED states.
505 * Can be called in atomic context.
507 bool rfkill_is_epo_lock_active(void)
509 return rfkill_epo_lock_active
;
513 * rfkill_get_global_sw_state - returns global state for a type
514 * @type: the type to get the global state of
516 * Returns the current global state for a given wireless
519 bool rfkill_get_global_sw_state(const enum rfkill_type type
)
521 return rfkill_global_states
[type
].cur
;
525 bool rfkill_set_hw_state(struct rfkill
*rfkill
, bool blocked
)
532 spin_lock_irqsave(&rfkill
->lock
, flags
);
533 prev
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
535 rfkill
->state
|= RFKILL_BLOCK_HW
;
537 rfkill
->state
&= ~RFKILL_BLOCK_HW
;
538 ret
= !!(rfkill
->state
& RFKILL_BLOCK_ANY
);
539 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
541 rfkill_led_trigger_event(rfkill
);
542 rfkill_global_led_trigger_event();
544 if (rfkill
->registered
&& prev
!= blocked
)
545 schedule_work(&rfkill
->uevent_work
);
549 EXPORT_SYMBOL(rfkill_set_hw_state
);
551 static void __rfkill_set_sw_state(struct rfkill
*rfkill
, bool blocked
)
553 u32 bit
= RFKILL_BLOCK_SW
;
555 /* if in a ops->set_block right now, use other bit */
556 if (rfkill
->state
& RFKILL_BLOCK_SW_SETCALL
)
557 bit
= RFKILL_BLOCK_SW_PREV
;
560 rfkill
->state
|= bit
;
562 rfkill
->state
&= ~bit
;
565 bool rfkill_set_sw_state(struct rfkill
*rfkill
, bool blocked
)
572 spin_lock_irqsave(&rfkill
->lock
, flags
);
573 prev
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
574 __rfkill_set_sw_state(rfkill
, blocked
);
575 hwblock
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
576 blocked
= blocked
|| hwblock
;
577 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
579 if (!rfkill
->registered
)
582 if (prev
!= blocked
&& !hwblock
)
583 schedule_work(&rfkill
->uevent_work
);
585 rfkill_led_trigger_event(rfkill
);
586 rfkill_global_led_trigger_event();
590 EXPORT_SYMBOL(rfkill_set_sw_state
);
592 void rfkill_init_sw_state(struct rfkill
*rfkill
, bool blocked
)
597 BUG_ON(rfkill
->registered
);
599 spin_lock_irqsave(&rfkill
->lock
, flags
);
600 __rfkill_set_sw_state(rfkill
, blocked
);
601 rfkill
->persistent
= true;
602 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
604 EXPORT_SYMBOL(rfkill_init_sw_state
);
606 void rfkill_set_states(struct rfkill
*rfkill
, bool sw
, bool hw
)
613 spin_lock_irqsave(&rfkill
->lock
, flags
);
616 * No need to care about prev/setblock ... this is for uevent only
617 * and that will get triggered by rfkill_set_block anyway.
619 swprev
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
620 hwprev
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
621 __rfkill_set_sw_state(rfkill
, sw
);
623 rfkill
->state
|= RFKILL_BLOCK_HW
;
625 rfkill
->state
&= ~RFKILL_BLOCK_HW
;
627 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
629 if (!rfkill
->registered
) {
630 rfkill
->persistent
= true;
632 if (swprev
!= sw
|| hwprev
!= hw
)
633 schedule_work(&rfkill
->uevent_work
);
635 rfkill_led_trigger_event(rfkill
);
636 rfkill_global_led_trigger_event();
639 EXPORT_SYMBOL(rfkill_set_states
);
641 static const char * const rfkill_types
[] = {
642 NULL
, /* RFKILL_TYPE_ALL */
653 enum rfkill_type
rfkill_find_type(const char *name
)
657 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types
) != NUM_RFKILL_TYPES
);
660 return RFKILL_TYPE_ALL
;
662 for (i
= 1; i
< NUM_RFKILL_TYPES
; i
++)
663 if (!strcmp(name
, rfkill_types
[i
]))
665 return RFKILL_TYPE_ALL
;
667 EXPORT_SYMBOL(rfkill_find_type
);
669 static ssize_t
name_show(struct device
*dev
, struct device_attribute
*attr
,
672 struct rfkill
*rfkill
= to_rfkill(dev
);
674 return sprintf(buf
, "%s\n", rfkill
->name
);
676 static DEVICE_ATTR_RO(name
);
678 static ssize_t
type_show(struct device
*dev
, struct device_attribute
*attr
,
681 struct rfkill
*rfkill
= to_rfkill(dev
);
683 return sprintf(buf
, "%s\n", rfkill_types
[rfkill
->type
]);
685 static DEVICE_ATTR_RO(type
);
687 static ssize_t
index_show(struct device
*dev
, struct device_attribute
*attr
,
690 struct rfkill
*rfkill
= to_rfkill(dev
);
692 return sprintf(buf
, "%d\n", rfkill
->idx
);
694 static DEVICE_ATTR_RO(index
);
696 static ssize_t
persistent_show(struct device
*dev
,
697 struct device_attribute
*attr
, char *buf
)
699 struct rfkill
*rfkill
= to_rfkill(dev
);
701 return sprintf(buf
, "%d\n", rfkill
->persistent
);
703 static DEVICE_ATTR_RO(persistent
);
705 static ssize_t
hard_show(struct device
*dev
, struct device_attribute
*attr
,
708 struct rfkill
*rfkill
= to_rfkill(dev
);
710 return sprintf(buf
, "%d\n", (rfkill
->state
& RFKILL_BLOCK_HW
) ? 1 : 0 );
712 static DEVICE_ATTR_RO(hard
);
714 static ssize_t
soft_show(struct device
*dev
, struct device_attribute
*attr
,
717 struct rfkill
*rfkill
= to_rfkill(dev
);
719 return sprintf(buf
, "%d\n", (rfkill
->state
& RFKILL_BLOCK_SW
) ? 1 : 0 );
722 static ssize_t
soft_store(struct device
*dev
, struct device_attribute
*attr
,
723 const char *buf
, size_t count
)
725 struct rfkill
*rfkill
= to_rfkill(dev
);
729 if (!capable(CAP_NET_ADMIN
))
732 err
= kstrtoul(buf
, 0, &state
);
739 mutex_lock(&rfkill_global_mutex
);
740 rfkill_set_block(rfkill
, state
);
741 mutex_unlock(&rfkill_global_mutex
);
745 static DEVICE_ATTR_RW(soft
);
747 static u8
user_state_from_blocked(unsigned long state
)
749 if (state
& RFKILL_BLOCK_HW
)
750 return RFKILL_USER_STATE_HARD_BLOCKED
;
751 if (state
& RFKILL_BLOCK_SW
)
752 return RFKILL_USER_STATE_SOFT_BLOCKED
;
754 return RFKILL_USER_STATE_UNBLOCKED
;
757 static ssize_t
state_show(struct device
*dev
, struct device_attribute
*attr
,
760 struct rfkill
*rfkill
= to_rfkill(dev
);
762 return sprintf(buf
, "%d\n", user_state_from_blocked(rfkill
->state
));
765 static ssize_t
state_store(struct device
*dev
, struct device_attribute
*attr
,
766 const char *buf
, size_t count
)
768 struct rfkill
*rfkill
= to_rfkill(dev
);
772 if (!capable(CAP_NET_ADMIN
))
775 err
= kstrtoul(buf
, 0, &state
);
779 if (state
!= RFKILL_USER_STATE_SOFT_BLOCKED
&&
780 state
!= RFKILL_USER_STATE_UNBLOCKED
)
783 mutex_lock(&rfkill_global_mutex
);
784 rfkill_set_block(rfkill
, state
== RFKILL_USER_STATE_SOFT_BLOCKED
);
785 mutex_unlock(&rfkill_global_mutex
);
789 static DEVICE_ATTR_RW(state
);
791 static struct attribute
*rfkill_dev_attrs
[] = {
794 &dev_attr_index
.attr
,
795 &dev_attr_persistent
.attr
,
796 &dev_attr_state
.attr
,
801 ATTRIBUTE_GROUPS(rfkill_dev
);
803 static void rfkill_release(struct device
*dev
)
805 struct rfkill
*rfkill
= to_rfkill(dev
);
810 static int rfkill_dev_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
812 struct rfkill
*rfkill
= to_rfkill(dev
);
817 error
= add_uevent_var(env
, "RFKILL_NAME=%s", rfkill
->name
);
820 error
= add_uevent_var(env
, "RFKILL_TYPE=%s",
821 rfkill_types
[rfkill
->type
]);
824 spin_lock_irqsave(&rfkill
->lock
, flags
);
825 state
= rfkill
->state
;
826 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
827 error
= add_uevent_var(env
, "RFKILL_STATE=%d",
828 user_state_from_blocked(state
));
832 void rfkill_pause_polling(struct rfkill
*rfkill
)
836 if (!rfkill
->ops
->poll
)
839 rfkill
->polling_paused
= true;
840 cancel_delayed_work_sync(&rfkill
->poll_work
);
842 EXPORT_SYMBOL(rfkill_pause_polling
);
844 void rfkill_resume_polling(struct rfkill
*rfkill
)
848 if (!rfkill
->ops
->poll
)
851 rfkill
->polling_paused
= false;
853 if (rfkill
->suspended
)
856 queue_delayed_work(system_power_efficient_wq
,
857 &rfkill
->poll_work
, 0);
859 EXPORT_SYMBOL(rfkill_resume_polling
);
861 #ifdef CONFIG_PM_SLEEP
862 static int rfkill_suspend(struct device
*dev
)
864 struct rfkill
*rfkill
= to_rfkill(dev
);
866 rfkill
->suspended
= true;
867 cancel_delayed_work_sync(&rfkill
->poll_work
);
872 static int rfkill_resume(struct device
*dev
)
874 struct rfkill
*rfkill
= to_rfkill(dev
);
877 rfkill
->suspended
= false;
879 if (!rfkill
->registered
)
882 if (!rfkill
->persistent
) {
883 cur
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
884 rfkill_set_block(rfkill
, cur
);
887 if (rfkill
->ops
->poll
&& !rfkill
->polling_paused
)
888 queue_delayed_work(system_power_efficient_wq
,
889 &rfkill
->poll_work
, 0);
894 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops
, rfkill_suspend
, rfkill_resume
);
895 #define RFKILL_PM_OPS (&rfkill_pm_ops)
897 #define RFKILL_PM_OPS NULL
900 static struct class rfkill_class
= {
902 .dev_release
= rfkill_release
,
903 .dev_groups
= rfkill_dev_groups
,
904 .dev_uevent
= rfkill_dev_uevent
,
908 bool rfkill_blocked(struct rfkill
*rfkill
)
913 spin_lock_irqsave(&rfkill
->lock
, flags
);
914 state
= rfkill
->state
;
915 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
917 return !!(state
& RFKILL_BLOCK_ANY
);
919 EXPORT_SYMBOL(rfkill_blocked
);
922 struct rfkill
* __must_check
rfkill_alloc(const char *name
,
923 struct device
*parent
,
924 const enum rfkill_type type
,
925 const struct rfkill_ops
*ops
,
928 struct rfkill
*rfkill
;
934 if (WARN_ON(!ops
->set_block
))
940 if (WARN_ON(type
== RFKILL_TYPE_ALL
|| type
>= NUM_RFKILL_TYPES
))
943 rfkill
= kzalloc(sizeof(*rfkill
) + strlen(name
) + 1, GFP_KERNEL
);
947 spin_lock_init(&rfkill
->lock
);
948 INIT_LIST_HEAD(&rfkill
->node
);
950 strcpy(rfkill
->name
, name
);
952 rfkill
->data
= ops_data
;
955 dev
->class = &rfkill_class
;
956 dev
->parent
= parent
;
957 device_initialize(dev
);
961 EXPORT_SYMBOL(rfkill_alloc
);
963 static void rfkill_poll(struct work_struct
*work
)
965 struct rfkill
*rfkill
;
967 rfkill
= container_of(work
, struct rfkill
, poll_work
.work
);
970 * Poll hardware state -- driver will use one of the
971 * rfkill_set{,_hw,_sw}_state functions and use its
972 * return value to update the current status.
974 rfkill
->ops
->poll(rfkill
, rfkill
->data
);
976 queue_delayed_work(system_power_efficient_wq
,
978 round_jiffies_relative(POLL_INTERVAL
));
981 static void rfkill_uevent_work(struct work_struct
*work
)
983 struct rfkill
*rfkill
;
985 rfkill
= container_of(work
, struct rfkill
, uevent_work
);
987 mutex_lock(&rfkill_global_mutex
);
988 rfkill_event(rfkill
);
989 mutex_unlock(&rfkill_global_mutex
);
992 static void rfkill_sync_work(struct work_struct
*work
)
994 struct rfkill
*rfkill
;
997 rfkill
= container_of(work
, struct rfkill
, sync_work
);
999 mutex_lock(&rfkill_global_mutex
);
1000 cur
= rfkill_global_states
[rfkill
->type
].cur
;
1001 rfkill_set_block(rfkill
, cur
);
1002 mutex_unlock(&rfkill_global_mutex
);
1005 int __must_check
rfkill_register(struct rfkill
*rfkill
)
1007 static unsigned long rfkill_no
;
1016 mutex_lock(&rfkill_global_mutex
);
1018 if (rfkill
->registered
) {
1023 rfkill
->idx
= rfkill_no
;
1024 dev_set_name(dev
, "rfkill%lu", rfkill_no
);
1027 list_add_tail(&rfkill
->node
, &rfkill_list
);
1029 error
= device_add(dev
);
1033 error
= rfkill_led_trigger_register(rfkill
);
1037 rfkill
->registered
= true;
1039 INIT_DELAYED_WORK(&rfkill
->poll_work
, rfkill_poll
);
1040 INIT_WORK(&rfkill
->uevent_work
, rfkill_uevent_work
);
1041 INIT_WORK(&rfkill
->sync_work
, rfkill_sync_work
);
1043 if (rfkill
->ops
->poll
)
1044 queue_delayed_work(system_power_efficient_wq
,
1046 round_jiffies_relative(POLL_INTERVAL
));
1048 if (!rfkill
->persistent
|| rfkill_epo_lock_active
) {
1049 schedule_work(&rfkill
->sync_work
);
1051 #ifdef CONFIG_RFKILL_INPUT
1052 bool soft_blocked
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
1054 if (!atomic_read(&rfkill_input_disabled
))
1055 __rfkill_switch_all(rfkill
->type
, soft_blocked
);
1059 rfkill_global_led_trigger_event();
1060 rfkill_send_events(rfkill
, RFKILL_OP_ADD
);
1062 mutex_unlock(&rfkill_global_mutex
);
1066 device_del(&rfkill
->dev
);
1068 list_del_init(&rfkill
->node
);
1070 mutex_unlock(&rfkill_global_mutex
);
1073 EXPORT_SYMBOL(rfkill_register
);
1075 void rfkill_unregister(struct rfkill
*rfkill
)
1079 if (rfkill
->ops
->poll
)
1080 cancel_delayed_work_sync(&rfkill
->poll_work
);
1082 cancel_work_sync(&rfkill
->uevent_work
);
1083 cancel_work_sync(&rfkill
->sync_work
);
1085 rfkill
->registered
= false;
1087 device_del(&rfkill
->dev
);
1089 mutex_lock(&rfkill_global_mutex
);
1090 rfkill_send_events(rfkill
, RFKILL_OP_DEL
);
1091 list_del_init(&rfkill
->node
);
1092 rfkill_global_led_trigger_event();
1093 mutex_unlock(&rfkill_global_mutex
);
1095 rfkill_led_trigger_unregister(rfkill
);
1097 EXPORT_SYMBOL(rfkill_unregister
);
1099 void rfkill_destroy(struct rfkill
*rfkill
)
1102 put_device(&rfkill
->dev
);
1104 EXPORT_SYMBOL(rfkill_destroy
);
1106 static int rfkill_fop_open(struct inode
*inode
, struct file
*file
)
1108 struct rfkill_data
*data
;
1109 struct rfkill
*rfkill
;
1110 struct rfkill_int_event
*ev
, *tmp
;
1112 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
1116 INIT_LIST_HEAD(&data
->events
);
1117 mutex_init(&data
->mtx
);
1118 init_waitqueue_head(&data
->read_wait
);
1120 mutex_lock(&rfkill_global_mutex
);
1121 mutex_lock(&data
->mtx
);
1123 * start getting events from elsewhere but hold mtx to get
1124 * startup events added first
1127 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
1128 ev
= kzalloc(sizeof(*ev
), GFP_KERNEL
);
1131 rfkill_fill_event(&ev
->ev
, rfkill
, RFKILL_OP_ADD
);
1132 list_add_tail(&ev
->list
, &data
->events
);
1134 list_add(&data
->list
, &rfkill_fds
);
1135 mutex_unlock(&data
->mtx
);
1136 mutex_unlock(&rfkill_global_mutex
);
1138 file
->private_data
= data
;
1140 return stream_open(inode
, file
);
1143 mutex_unlock(&data
->mtx
);
1144 mutex_unlock(&rfkill_global_mutex
);
1145 mutex_destroy(&data
->mtx
);
1146 list_for_each_entry_safe(ev
, tmp
, &data
->events
, list
)
1152 static __poll_t
rfkill_fop_poll(struct file
*file
, poll_table
*wait
)
1154 struct rfkill_data
*data
= file
->private_data
;
1155 __poll_t res
= EPOLLOUT
| EPOLLWRNORM
;
1157 poll_wait(file
, &data
->read_wait
, wait
);
1159 mutex_lock(&data
->mtx
);
1160 if (!list_empty(&data
->events
))
1161 res
= EPOLLIN
| EPOLLRDNORM
;
1162 mutex_unlock(&data
->mtx
);
1167 static ssize_t
rfkill_fop_read(struct file
*file
, char __user
*buf
,
1168 size_t count
, loff_t
*pos
)
1170 struct rfkill_data
*data
= file
->private_data
;
1171 struct rfkill_int_event
*ev
;
1175 mutex_lock(&data
->mtx
);
1177 while (list_empty(&data
->events
)) {
1178 if (file
->f_flags
& O_NONBLOCK
) {
1182 mutex_unlock(&data
->mtx
);
1183 /* since we re-check and it just compares pointers,
1184 * using !list_empty() without locking isn't a problem
1186 ret
= wait_event_interruptible(data
->read_wait
,
1187 !list_empty(&data
->events
));
1188 mutex_lock(&data
->mtx
);
1194 ev
= list_first_entry(&data
->events
, struct rfkill_int_event
,
1197 sz
= min_t(unsigned long, sizeof(ev
->ev
), count
);
1199 if (copy_to_user(buf
, &ev
->ev
, sz
))
1202 list_del(&ev
->list
);
1205 mutex_unlock(&data
->mtx
);
1209 static ssize_t
rfkill_fop_write(struct file
*file
, const char __user
*buf
,
1210 size_t count
, loff_t
*pos
)
1212 struct rfkill
*rfkill
;
1213 struct rfkill_event ev
;
1216 /* we don't need the 'hard' variable but accept it */
1217 if (count
< RFKILL_EVENT_SIZE_V1
- 1)
1221 * Copy as much data as we can accept into our 'ev' buffer,
1222 * but tell userspace how much we've copied so it can determine
1223 * our API version even in a write() call, if it cares.
1225 count
= min(count
, sizeof(ev
));
1226 if (copy_from_user(&ev
, buf
, count
))
1229 if (ev
.type
>= NUM_RFKILL_TYPES
)
1232 mutex_lock(&rfkill_global_mutex
);
1235 case RFKILL_OP_CHANGE_ALL
:
1236 rfkill_update_global_state(ev
.type
, ev
.soft
);
1237 list_for_each_entry(rfkill
, &rfkill_list
, node
)
1238 if (rfkill
->type
== ev
.type
||
1239 ev
.type
== RFKILL_TYPE_ALL
)
1240 rfkill_set_block(rfkill
, ev
.soft
);
1243 case RFKILL_OP_CHANGE
:
1244 list_for_each_entry(rfkill
, &rfkill_list
, node
)
1245 if (rfkill
->idx
== ev
.idx
&&
1246 (rfkill
->type
== ev
.type
||
1247 ev
.type
== RFKILL_TYPE_ALL
))
1248 rfkill_set_block(rfkill
, ev
.soft
);
1256 mutex_unlock(&rfkill_global_mutex
);
1258 return ret
?: count
;
1261 static int rfkill_fop_release(struct inode
*inode
, struct file
*file
)
1263 struct rfkill_data
*data
= file
->private_data
;
1264 struct rfkill_int_event
*ev
, *tmp
;
1266 mutex_lock(&rfkill_global_mutex
);
1267 list_del(&data
->list
);
1268 mutex_unlock(&rfkill_global_mutex
);
1270 mutex_destroy(&data
->mtx
);
1271 list_for_each_entry_safe(ev
, tmp
, &data
->events
, list
)
1274 #ifdef CONFIG_RFKILL_INPUT
1275 if (data
->input_handler
)
1276 if (atomic_dec_return(&rfkill_input_disabled
) == 0)
1277 printk(KERN_DEBUG
"rfkill: input handler enabled\n");
1285 #ifdef CONFIG_RFKILL_INPUT
1286 static long rfkill_fop_ioctl(struct file
*file
, unsigned int cmd
,
1289 struct rfkill_data
*data
= file
->private_data
;
1291 if (_IOC_TYPE(cmd
) != RFKILL_IOC_MAGIC
)
1294 if (_IOC_NR(cmd
) != RFKILL_IOC_NOINPUT
)
1297 mutex_lock(&data
->mtx
);
1299 if (!data
->input_handler
) {
1300 if (atomic_inc_return(&rfkill_input_disabled
) == 1)
1301 printk(KERN_DEBUG
"rfkill: input handler disabled\n");
1302 data
->input_handler
= true;
1305 mutex_unlock(&data
->mtx
);
1311 static const struct file_operations rfkill_fops
= {
1312 .owner
= THIS_MODULE
,
1313 .open
= rfkill_fop_open
,
1314 .read
= rfkill_fop_read
,
1315 .write
= rfkill_fop_write
,
1316 .poll
= rfkill_fop_poll
,
1317 .release
= rfkill_fop_release
,
1318 #ifdef CONFIG_RFKILL_INPUT
1319 .unlocked_ioctl
= rfkill_fop_ioctl
,
1320 .compat_ioctl
= compat_ptr_ioctl
,
1322 .llseek
= no_llseek
,
1325 #define RFKILL_NAME "rfkill"
1327 static struct miscdevice rfkill_miscdev
= {
1328 .fops
= &rfkill_fops
,
1329 .name
= RFKILL_NAME
,
1330 .minor
= RFKILL_MINOR
,
1333 static int __init
rfkill_init(void)
1337 rfkill_update_global_state(RFKILL_TYPE_ALL
, !rfkill_default_state
);
1339 error
= class_register(&rfkill_class
);
1343 error
= misc_register(&rfkill_miscdev
);
1347 error
= rfkill_global_led_trigger_register();
1349 goto error_led_trigger
;
1351 #ifdef CONFIG_RFKILL_INPUT
1352 error
= rfkill_handler_init();
1359 #ifdef CONFIG_RFKILL_INPUT
1361 rfkill_global_led_trigger_unregister();
1364 misc_deregister(&rfkill_miscdev
);
1366 class_unregister(&rfkill_class
);
1370 subsys_initcall(rfkill_init
);
1372 static void __exit
rfkill_exit(void)
1374 #ifdef CONFIG_RFKILL_INPUT
1375 rfkill_handler_exit();
1377 rfkill_global_led_trigger_unregister();
1378 misc_deregister(&rfkill_miscdev
);
1379 class_unregister(&rfkill_class
);
1381 module_exit(rfkill_exit
);
1383 MODULE_ALIAS_MISCDEV(RFKILL_MINOR
);
1384 MODULE_ALIAS("devname:" RFKILL_NAME
);