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
)
652 * The intention was that userspace can only take control over
653 * a given device when/if rfkill-input doesn't control it due
654 * to user_claim. Since user_claim is currently unsupported,
655 * we never support changing the state from userspace -- this
656 * can be implemented again later.
662 static ssize_t
rfkill_claim_show(struct device
*dev
,
663 struct device_attribute
*attr
,
666 return sprintf(buf
, "%d\n", 0);
669 static ssize_t
rfkill_claim_store(struct device
*dev
,
670 struct device_attribute
*attr
,
671 const char *buf
, size_t count
)
676 static struct device_attribute rfkill_dev_attrs
[] = {
677 __ATTR(name
, S_IRUGO
, rfkill_name_show
, NULL
),
678 __ATTR(type
, S_IRUGO
, rfkill_type_show
, NULL
),
679 __ATTR(index
, S_IRUGO
, rfkill_idx_show
, NULL
),
680 __ATTR(persistent
, S_IRUGO
, rfkill_persistent_show
, NULL
),
681 __ATTR(state
, S_IRUGO
|S_IWUSR
, rfkill_state_show
, rfkill_state_store
),
682 __ATTR(claim
, S_IRUGO
|S_IWUSR
, rfkill_claim_show
, rfkill_claim_store
),
686 static void rfkill_release(struct device
*dev
)
688 struct rfkill
*rfkill
= to_rfkill(dev
);
693 static int rfkill_dev_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
695 struct rfkill
*rfkill
= to_rfkill(dev
);
700 error
= add_uevent_var(env
, "RFKILL_NAME=%s", rfkill
->name
);
703 error
= add_uevent_var(env
, "RFKILL_TYPE=%s",
704 rfkill_get_type_str(rfkill
->type
));
707 spin_lock_irqsave(&rfkill
->lock
, flags
);
708 state
= rfkill
->state
;
709 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
710 error
= add_uevent_var(env
, "RFKILL_STATE=%d",
711 user_state_from_blocked(state
));
715 void rfkill_pause_polling(struct rfkill
*rfkill
)
719 if (!rfkill
->ops
->poll
)
722 cancel_delayed_work_sync(&rfkill
->poll_work
);
724 EXPORT_SYMBOL(rfkill_pause_polling
);
726 void rfkill_resume_polling(struct rfkill
*rfkill
)
730 if (!rfkill
->ops
->poll
)
733 schedule_work(&rfkill
->poll_work
.work
);
735 EXPORT_SYMBOL(rfkill_resume_polling
);
737 static int rfkill_suspend(struct device
*dev
, pm_message_t state
)
739 struct rfkill
*rfkill
= to_rfkill(dev
);
741 rfkill_pause_polling(rfkill
);
746 static int rfkill_resume(struct device
*dev
)
748 struct rfkill
*rfkill
= to_rfkill(dev
);
751 if (!rfkill
->persistent
) {
752 cur
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
753 rfkill_set_block(rfkill
, cur
);
756 rfkill_resume_polling(rfkill
);
761 static struct class rfkill_class
= {
763 .dev_release
= rfkill_release
,
764 .dev_attrs
= rfkill_dev_attrs
,
765 .dev_uevent
= rfkill_dev_uevent
,
766 .suspend
= rfkill_suspend
,
767 .resume
= rfkill_resume
,
770 bool rfkill_blocked(struct rfkill
*rfkill
)
775 spin_lock_irqsave(&rfkill
->lock
, flags
);
776 state
= rfkill
->state
;
777 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
779 return !!(state
& RFKILL_BLOCK_ANY
);
781 EXPORT_SYMBOL(rfkill_blocked
);
784 struct rfkill
* __must_check
rfkill_alloc(const char *name
,
785 struct device
*parent
,
786 const enum rfkill_type type
,
787 const struct rfkill_ops
*ops
,
790 struct rfkill
*rfkill
;
796 if (WARN_ON(!ops
->set_block
))
802 if (WARN_ON(type
== RFKILL_TYPE_ALL
|| type
>= NUM_RFKILL_TYPES
))
805 rfkill
= kzalloc(sizeof(*rfkill
), GFP_KERNEL
);
809 spin_lock_init(&rfkill
->lock
);
810 INIT_LIST_HEAD(&rfkill
->node
);
814 rfkill
->data
= ops_data
;
817 dev
->class = &rfkill_class
;
818 dev
->parent
= parent
;
819 device_initialize(dev
);
823 EXPORT_SYMBOL(rfkill_alloc
);
825 static void rfkill_poll(struct work_struct
*work
)
827 struct rfkill
*rfkill
;
829 rfkill
= container_of(work
, struct rfkill
, poll_work
.work
);
832 * Poll hardware state -- driver will use one of the
833 * rfkill_set{,_hw,_sw}_state functions and use its
834 * return value to update the current status.
836 rfkill
->ops
->poll(rfkill
, rfkill
->data
);
838 schedule_delayed_work(&rfkill
->poll_work
,
839 round_jiffies_relative(POLL_INTERVAL
));
842 static void rfkill_uevent_work(struct work_struct
*work
)
844 struct rfkill
*rfkill
;
846 rfkill
= container_of(work
, struct rfkill
, uevent_work
);
848 mutex_lock(&rfkill_global_mutex
);
849 rfkill_event(rfkill
);
850 mutex_unlock(&rfkill_global_mutex
);
853 static void rfkill_sync_work(struct work_struct
*work
)
855 struct rfkill
*rfkill
;
858 rfkill
= container_of(work
, struct rfkill
, sync_work
);
860 mutex_lock(&rfkill_global_mutex
);
861 cur
= rfkill_global_states
[rfkill
->type
].cur
;
862 rfkill_set_block(rfkill
, cur
);
863 mutex_unlock(&rfkill_global_mutex
);
866 int __must_check
rfkill_register(struct rfkill
*rfkill
)
868 static unsigned long rfkill_no
;
869 struct device
*dev
= &rfkill
->dev
;
874 mutex_lock(&rfkill_global_mutex
);
876 if (rfkill
->registered
) {
881 rfkill
->idx
= rfkill_no
;
882 dev_set_name(dev
, "rfkill%lu", rfkill_no
);
885 list_add_tail(&rfkill
->node
, &rfkill_list
);
887 error
= device_add(dev
);
891 error
= rfkill_led_trigger_register(rfkill
);
895 rfkill
->registered
= true;
897 INIT_DELAYED_WORK(&rfkill
->poll_work
, rfkill_poll
);
898 INIT_WORK(&rfkill
->uevent_work
, rfkill_uevent_work
);
899 INIT_WORK(&rfkill
->sync_work
, rfkill_sync_work
);
901 if (rfkill
->ops
->poll
)
902 schedule_delayed_work(&rfkill
->poll_work
,
903 round_jiffies_relative(POLL_INTERVAL
));
905 if (!rfkill
->persistent
|| rfkill_epo_lock_active
) {
906 schedule_work(&rfkill
->sync_work
);
908 #ifdef CONFIG_RFKILL_INPUT
909 bool soft_blocked
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
911 if (!atomic_read(&rfkill_input_disabled
))
912 __rfkill_switch_all(rfkill
->type
, soft_blocked
);
916 rfkill_send_events(rfkill
, RFKILL_OP_ADD
);
918 mutex_unlock(&rfkill_global_mutex
);
922 device_del(&rfkill
->dev
);
924 list_del_init(&rfkill
->node
);
926 mutex_unlock(&rfkill_global_mutex
);
929 EXPORT_SYMBOL(rfkill_register
);
931 void rfkill_unregister(struct rfkill
*rfkill
)
935 if (rfkill
->ops
->poll
)
936 cancel_delayed_work_sync(&rfkill
->poll_work
);
938 cancel_work_sync(&rfkill
->uevent_work
);
939 cancel_work_sync(&rfkill
->sync_work
);
941 rfkill
->registered
= false;
943 device_del(&rfkill
->dev
);
945 mutex_lock(&rfkill_global_mutex
);
946 rfkill_send_events(rfkill
, RFKILL_OP_DEL
);
947 list_del_init(&rfkill
->node
);
948 mutex_unlock(&rfkill_global_mutex
);
950 rfkill_led_trigger_unregister(rfkill
);
952 EXPORT_SYMBOL(rfkill_unregister
);
954 void rfkill_destroy(struct rfkill
*rfkill
)
957 put_device(&rfkill
->dev
);
959 EXPORT_SYMBOL(rfkill_destroy
);
961 static int rfkill_fop_open(struct inode
*inode
, struct file
*file
)
963 struct rfkill_data
*data
;
964 struct rfkill
*rfkill
;
965 struct rfkill_int_event
*ev
, *tmp
;
967 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
971 INIT_LIST_HEAD(&data
->events
);
972 mutex_init(&data
->mtx
);
973 init_waitqueue_head(&data
->read_wait
);
975 mutex_lock(&rfkill_global_mutex
);
976 mutex_lock(&data
->mtx
);
978 * start getting events from elsewhere but hold mtx to get
979 * startup events added first
981 list_add(&data
->list
, &rfkill_fds
);
983 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
984 ev
= kzalloc(sizeof(*ev
), GFP_KERNEL
);
987 rfkill_fill_event(&ev
->ev
, rfkill
, RFKILL_OP_ADD
);
988 list_add_tail(&ev
->list
, &data
->events
);
990 mutex_unlock(&data
->mtx
);
991 mutex_unlock(&rfkill_global_mutex
);
993 file
->private_data
= data
;
995 return nonseekable_open(inode
, file
);
998 mutex_unlock(&data
->mtx
);
999 mutex_unlock(&rfkill_global_mutex
);
1000 mutex_destroy(&data
->mtx
);
1001 list_for_each_entry_safe(ev
, tmp
, &data
->events
, list
)
1007 static unsigned int rfkill_fop_poll(struct file
*file
, poll_table
*wait
)
1009 struct rfkill_data
*data
= file
->private_data
;
1010 unsigned int res
= POLLOUT
| POLLWRNORM
;
1012 poll_wait(file
, &data
->read_wait
, wait
);
1014 mutex_lock(&data
->mtx
);
1015 if (!list_empty(&data
->events
))
1016 res
= POLLIN
| POLLRDNORM
;
1017 mutex_unlock(&data
->mtx
);
1022 static bool rfkill_readable(struct rfkill_data
*data
)
1026 mutex_lock(&data
->mtx
);
1027 r
= !list_empty(&data
->events
);
1028 mutex_unlock(&data
->mtx
);
1033 static ssize_t
rfkill_fop_read(struct file
*file
, char __user
*buf
,
1034 size_t count
, loff_t
*pos
)
1036 struct rfkill_data
*data
= file
->private_data
;
1037 struct rfkill_int_event
*ev
;
1041 mutex_lock(&data
->mtx
);
1043 while (list_empty(&data
->events
)) {
1044 if (file
->f_flags
& O_NONBLOCK
) {
1048 mutex_unlock(&data
->mtx
);
1049 ret
= wait_event_interruptible(data
->read_wait
,
1050 rfkill_readable(data
));
1051 mutex_lock(&data
->mtx
);
1057 ev
= list_first_entry(&data
->events
, struct rfkill_int_event
,
1060 sz
= min_t(unsigned long, sizeof(ev
->ev
), count
);
1062 if (copy_to_user(buf
, &ev
->ev
, sz
))
1065 list_del(&ev
->list
);
1068 mutex_unlock(&data
->mtx
);
1072 static ssize_t
rfkill_fop_write(struct file
*file
, const char __user
*buf
,
1073 size_t count
, loff_t
*pos
)
1075 struct rfkill
*rfkill
;
1076 struct rfkill_event ev
;
1078 /* we don't need the 'hard' variable but accept it */
1079 if (count
< sizeof(ev
) - 1)
1082 if (copy_from_user(&ev
, buf
, sizeof(ev
) - 1))
1085 if (ev
.op
!= RFKILL_OP_CHANGE
&& ev
.op
!= RFKILL_OP_CHANGE_ALL
)
1088 if (ev
.type
>= NUM_RFKILL_TYPES
)
1091 mutex_lock(&rfkill_global_mutex
);
1093 if (ev
.op
== RFKILL_OP_CHANGE_ALL
) {
1094 if (ev
.type
== RFKILL_TYPE_ALL
) {
1096 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
1097 rfkill_global_states
[i
].cur
= ev
.soft
;
1099 rfkill_global_states
[ev
.type
].cur
= ev
.soft
;
1103 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
1104 if (rfkill
->idx
!= ev
.idx
&& ev
.op
!= RFKILL_OP_CHANGE_ALL
)
1107 if (rfkill
->type
!= ev
.type
&& ev
.type
!= RFKILL_TYPE_ALL
)
1110 rfkill_set_block(rfkill
, ev
.soft
);
1112 mutex_unlock(&rfkill_global_mutex
);
1117 static int rfkill_fop_release(struct inode
*inode
, struct file
*file
)
1119 struct rfkill_data
*data
= file
->private_data
;
1120 struct rfkill_int_event
*ev
, *tmp
;
1122 mutex_lock(&rfkill_global_mutex
);
1123 list_del(&data
->list
);
1124 mutex_unlock(&rfkill_global_mutex
);
1126 mutex_destroy(&data
->mtx
);
1127 list_for_each_entry_safe(ev
, tmp
, &data
->events
, list
)
1130 #ifdef CONFIG_RFKILL_INPUT
1131 if (data
->input_handler
)
1132 if (atomic_dec_return(&rfkill_input_disabled
) == 0)
1133 printk(KERN_DEBUG
"rfkill: input handler enabled\n");
1141 #ifdef CONFIG_RFKILL_INPUT
1142 static long rfkill_fop_ioctl(struct file
*file
, unsigned int cmd
,
1145 struct rfkill_data
*data
= file
->private_data
;
1147 if (_IOC_TYPE(cmd
) != RFKILL_IOC_MAGIC
)
1150 if (_IOC_NR(cmd
) != RFKILL_IOC_NOINPUT
)
1153 mutex_lock(&data
->mtx
);
1155 if (!data
->input_handler
) {
1156 if (atomic_inc_return(&rfkill_input_disabled
) == 1)
1157 printk(KERN_DEBUG
"rfkill: input handler disabled\n");
1158 data
->input_handler
= true;
1161 mutex_unlock(&data
->mtx
);
1167 static const struct file_operations rfkill_fops
= {
1168 .open
= rfkill_fop_open
,
1169 .read
= rfkill_fop_read
,
1170 .write
= rfkill_fop_write
,
1171 .poll
= rfkill_fop_poll
,
1172 .release
= rfkill_fop_release
,
1173 #ifdef CONFIG_RFKILL_INPUT
1174 .unlocked_ioctl
= rfkill_fop_ioctl
,
1175 .compat_ioctl
= rfkill_fop_ioctl
,
1179 static struct miscdevice rfkill_miscdev
= {
1181 .fops
= &rfkill_fops
,
1182 .minor
= MISC_DYNAMIC_MINOR
,
1185 static int __init
rfkill_init(void)
1190 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
1191 rfkill_global_states
[i
].cur
= !rfkill_default_state
;
1193 error
= class_register(&rfkill_class
);
1197 error
= misc_register(&rfkill_miscdev
);
1199 class_unregister(&rfkill_class
);
1203 #ifdef CONFIG_RFKILL_INPUT
1204 error
= rfkill_handler_init();
1206 misc_deregister(&rfkill_miscdev
);
1207 class_unregister(&rfkill_class
);
1215 subsys_initcall(rfkill_init
);
1217 static void __exit
rfkill_exit(void)
1219 #ifdef CONFIG_RFKILL_INPUT
1220 rfkill_handler_exit();
1222 misc_deregister(&rfkill_miscdev
);
1223 class_unregister(&rfkill_class
);
1225 module_exit(rfkill_exit
);