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/sched.h>
31 #include <linux/spinlock.h>
32 #include <linux/device.h>
33 #include <linux/miscdevice.h>
34 #include <linux/wait.h>
35 #include <linux/poll.h>
37 #include <linux/slab.h>
41 #define POLL_INTERVAL (5 * HZ)
43 #define RFKILL_BLOCK_HW BIT(0)
44 #define RFKILL_BLOCK_SW BIT(1)
45 #define RFKILL_BLOCK_SW_PREV BIT(2)
46 #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
49 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
55 enum rfkill_type type
;
64 const struct rfkill_ops
*ops
;
67 #ifdef CONFIG_RFKILL_LEDS
68 struct led_trigger led_trigger
;
69 const char *ledtrigname
;
73 struct list_head node
;
75 struct delayed_work poll_work
;
76 struct work_struct uevent_work
;
77 struct work_struct sync_work
;
79 #define to_rfkill(d) container_of(d, struct rfkill, dev)
81 struct rfkill_int_event
{
82 struct list_head list
;
83 struct rfkill_event ev
;
87 struct list_head list
;
88 struct list_head events
;
90 wait_queue_head_t read_wait
;
95 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
96 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
97 MODULE_DESCRIPTION("RF switch support");
98 MODULE_LICENSE("GPL");
102 * The locking here should be made much smarter, we currently have
103 * a bit of a stupid situation because drivers might want to register
104 * the rfkill struct under their own lock, and take this lock during
105 * rfkill method calls -- which will cause an AB-BA deadlock situation.
107 * To fix that, we need to rework this code here to be mostly lock-free
108 * and only use the mutex for list manipulations, not to protect the
109 * various other global variables. Then we can avoid holding the mutex
110 * around driver operations, and all is happy.
112 static LIST_HEAD(rfkill_list
); /* list of registered rf switches */
113 static DEFINE_MUTEX(rfkill_global_mutex
);
114 static LIST_HEAD(rfkill_fds
); /* list of open fds of /dev/rfkill */
116 static unsigned int rfkill_default_state
= 1;
117 module_param_named(default_state
, rfkill_default_state
, uint
, 0444);
118 MODULE_PARM_DESC(default_state
,
119 "Default initial state for all radio types, 0 = radio off");
123 } rfkill_global_states
[NUM_RFKILL_TYPES
];
125 static bool rfkill_epo_lock_active
;
128 #ifdef CONFIG_RFKILL_LEDS
129 static void rfkill_led_trigger_event(struct rfkill
*rfkill
)
131 struct led_trigger
*trigger
;
133 if (!rfkill
->registered
)
136 trigger
= &rfkill
->led_trigger
;
138 if (rfkill
->state
& RFKILL_BLOCK_ANY
)
139 led_trigger_event(trigger
, LED_OFF
);
141 led_trigger_event(trigger
, LED_FULL
);
144 static void rfkill_led_trigger_activate(struct led_classdev
*led
)
146 struct rfkill
*rfkill
;
148 rfkill
= container_of(led
->trigger
, struct rfkill
, led_trigger
);
150 rfkill_led_trigger_event(rfkill
);
153 static int rfkill_led_trigger_register(struct rfkill
*rfkill
)
155 rfkill
->led_trigger
.name
= rfkill
->ledtrigname
156 ? : dev_name(&rfkill
->dev
);
157 rfkill
->led_trigger
.activate
= rfkill_led_trigger_activate
;
158 return led_trigger_register(&rfkill
->led_trigger
);
161 static void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
163 led_trigger_unregister(&rfkill
->led_trigger
);
166 static void rfkill_led_trigger_event(struct rfkill
*rfkill
)
170 static inline int rfkill_led_trigger_register(struct rfkill
*rfkill
)
175 static inline void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
178 #endif /* CONFIG_RFKILL_LEDS */
180 static void rfkill_fill_event(struct rfkill_event
*ev
, struct rfkill
*rfkill
,
181 enum rfkill_operation op
)
185 ev
->idx
= rfkill
->idx
;
186 ev
->type
= rfkill
->type
;
189 spin_lock_irqsave(&rfkill
->lock
, flags
);
190 ev
->hard
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
191 ev
->soft
= !!(rfkill
->state
& (RFKILL_BLOCK_SW
|
192 RFKILL_BLOCK_SW_PREV
));
193 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
196 static void rfkill_send_events(struct rfkill
*rfkill
, enum rfkill_operation op
)
198 struct rfkill_data
*data
;
199 struct rfkill_int_event
*ev
;
201 list_for_each_entry(data
, &rfkill_fds
, list
) {
202 ev
= kzalloc(sizeof(*ev
), GFP_KERNEL
);
205 rfkill_fill_event(&ev
->ev
, rfkill
, op
);
206 mutex_lock(&data
->mtx
);
207 list_add_tail(&ev
->list
, &data
->events
);
208 mutex_unlock(&data
->mtx
);
209 wake_up_interruptible(&data
->read_wait
);
213 static void rfkill_event(struct rfkill
*rfkill
)
215 if (!rfkill
->registered
)
218 kobject_uevent(&rfkill
->dev
.kobj
, KOBJ_CHANGE
);
220 /* also send event to /dev/rfkill */
221 rfkill_send_events(rfkill
, RFKILL_OP_CHANGE
);
224 static bool __rfkill_set_hw_state(struct rfkill
*rfkill
,
225 bool blocked
, bool *change
)
232 spin_lock_irqsave(&rfkill
->lock
, flags
);
233 prev
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
235 rfkill
->state
|= RFKILL_BLOCK_HW
;
237 rfkill
->state
&= ~RFKILL_BLOCK_HW
;
238 *change
= prev
!= blocked
;
239 any
= !!(rfkill
->state
& RFKILL_BLOCK_ANY
);
240 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
242 rfkill_led_trigger_event(rfkill
);
248 * rfkill_set_block - wrapper for set_block method
250 * @rfkill: the rfkill struct to use
251 * @blocked: the new software state
253 * Calls the set_block method (when applicable) and handles notifications
256 static void rfkill_set_block(struct rfkill
*rfkill
, bool blocked
)
261 if (unlikely(rfkill
->dev
.power
.power_state
.event
& PM_EVENT_SLEEP
))
265 * Some platforms (...!) generate input events which affect the
266 * _hard_ kill state -- whenever something tries to change the
267 * current software state query the hardware state too.
269 if (rfkill
->ops
->query
)
270 rfkill
->ops
->query(rfkill
, rfkill
->data
);
272 spin_lock_irqsave(&rfkill
->lock
, flags
);
273 if (rfkill
->state
& RFKILL_BLOCK_SW
)
274 rfkill
->state
|= RFKILL_BLOCK_SW_PREV
;
276 rfkill
->state
&= ~RFKILL_BLOCK_SW_PREV
;
279 rfkill
->state
|= RFKILL_BLOCK_SW
;
281 rfkill
->state
&= ~RFKILL_BLOCK_SW
;
283 rfkill
->state
|= RFKILL_BLOCK_SW_SETCALL
;
284 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
286 err
= rfkill
->ops
->set_block(rfkill
->data
, blocked
);
288 spin_lock_irqsave(&rfkill
->lock
, flags
);
291 * Failed -- reset status to _prev, this may be different
292 * from what set set _PREV to earlier in this function
293 * if rfkill_set_sw_state was invoked.
295 if (rfkill
->state
& RFKILL_BLOCK_SW_PREV
)
296 rfkill
->state
|= RFKILL_BLOCK_SW
;
298 rfkill
->state
&= ~RFKILL_BLOCK_SW
;
300 rfkill
->state
&= ~RFKILL_BLOCK_SW_SETCALL
;
301 rfkill
->state
&= ~RFKILL_BLOCK_SW_PREV
;
302 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
304 rfkill_led_trigger_event(rfkill
);
305 rfkill_event(rfkill
);
308 #ifdef CONFIG_RFKILL_INPUT
309 static atomic_t rfkill_input_disabled
= ATOMIC_INIT(0);
312 * __rfkill_switch_all - Toggle state of all switches of given type
313 * @type: type of interfaces to be affected
314 * @state: the new state
316 * This function sets the state of all switches of given type,
317 * unless a specific switch is claimed by userspace (in which case,
318 * that switch is left alone) or suspended.
320 * Caller must have acquired rfkill_global_mutex.
322 static void __rfkill_switch_all(const enum rfkill_type type
, bool blocked
)
324 struct rfkill
*rfkill
;
326 rfkill_global_states
[type
].cur
= blocked
;
327 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
328 if (rfkill
->type
!= type
&& type
!= RFKILL_TYPE_ALL
)
331 rfkill_set_block(rfkill
, blocked
);
336 * rfkill_switch_all - Toggle state of all switches of given type
337 * @type: type of interfaces to be affected
338 * @state: the new state
340 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
341 * Please refer to __rfkill_switch_all() for details.
343 * Does nothing if the EPO lock is active.
345 void rfkill_switch_all(enum rfkill_type type
, bool blocked
)
347 if (atomic_read(&rfkill_input_disabled
))
350 mutex_lock(&rfkill_global_mutex
);
352 if (!rfkill_epo_lock_active
)
353 __rfkill_switch_all(type
, blocked
);
355 mutex_unlock(&rfkill_global_mutex
);
359 * rfkill_epo - emergency power off all transmitters
361 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
362 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
364 * The global state before the EPO is saved and can be restored later
365 * using rfkill_restore_states().
367 void rfkill_epo(void)
369 struct rfkill
*rfkill
;
372 if (atomic_read(&rfkill_input_disabled
))
375 mutex_lock(&rfkill_global_mutex
);
377 rfkill_epo_lock_active
= true;
378 list_for_each_entry(rfkill
, &rfkill_list
, node
)
379 rfkill_set_block(rfkill
, true);
381 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++) {
382 rfkill_global_states
[i
].sav
= rfkill_global_states
[i
].cur
;
383 rfkill_global_states
[i
].cur
= true;
386 mutex_unlock(&rfkill_global_mutex
);
390 * rfkill_restore_states - restore global states
392 * Restore (and sync switches to) the global state from the
393 * states in rfkill_default_states. This can undo the effects of
394 * a call to rfkill_epo().
396 void rfkill_restore_states(void)
400 if (atomic_read(&rfkill_input_disabled
))
403 mutex_lock(&rfkill_global_mutex
);
405 rfkill_epo_lock_active
= false;
406 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
407 __rfkill_switch_all(i
, rfkill_global_states
[i
].sav
);
408 mutex_unlock(&rfkill_global_mutex
);
412 * rfkill_remove_epo_lock - unlock state changes
414 * Used by rfkill-input manually unlock state changes, when
415 * the EPO switch is deactivated.
417 void rfkill_remove_epo_lock(void)
419 if (atomic_read(&rfkill_input_disabled
))
422 mutex_lock(&rfkill_global_mutex
);
423 rfkill_epo_lock_active
= false;
424 mutex_unlock(&rfkill_global_mutex
);
428 * rfkill_is_epo_lock_active - returns true EPO is active
430 * Returns 0 (false) if there is NOT an active EPO contidion,
431 * and 1 (true) if there is an active EPO contition, which
432 * locks all radios in one of the BLOCKED states.
434 * Can be called in atomic context.
436 bool rfkill_is_epo_lock_active(void)
438 return rfkill_epo_lock_active
;
442 * rfkill_get_global_sw_state - returns global state for a type
443 * @type: the type to get the global state of
445 * Returns the current global state for a given wireless
448 bool rfkill_get_global_sw_state(const enum rfkill_type type
)
450 return rfkill_global_states
[type
].cur
;
455 bool rfkill_set_hw_state(struct rfkill
*rfkill
, bool blocked
)
459 ret
= __rfkill_set_hw_state(rfkill
, blocked
, &change
);
461 if (!rfkill
->registered
)
465 schedule_work(&rfkill
->uevent_work
);
469 EXPORT_SYMBOL(rfkill_set_hw_state
);
471 static void __rfkill_set_sw_state(struct rfkill
*rfkill
, bool blocked
)
473 u32 bit
= RFKILL_BLOCK_SW
;
475 /* if in a ops->set_block right now, use other bit */
476 if (rfkill
->state
& RFKILL_BLOCK_SW_SETCALL
)
477 bit
= RFKILL_BLOCK_SW_PREV
;
480 rfkill
->state
|= bit
;
482 rfkill
->state
&= ~bit
;
485 bool rfkill_set_sw_state(struct rfkill
*rfkill
, bool blocked
)
492 spin_lock_irqsave(&rfkill
->lock
, flags
);
493 prev
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
494 __rfkill_set_sw_state(rfkill
, blocked
);
495 hwblock
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
496 blocked
= blocked
|| hwblock
;
497 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
499 if (!rfkill
->registered
)
502 if (prev
!= blocked
&& !hwblock
)
503 schedule_work(&rfkill
->uevent_work
);
505 rfkill_led_trigger_event(rfkill
);
509 EXPORT_SYMBOL(rfkill_set_sw_state
);
511 void rfkill_init_sw_state(struct rfkill
*rfkill
, bool blocked
)
516 BUG_ON(rfkill
->registered
);
518 spin_lock_irqsave(&rfkill
->lock
, flags
);
519 __rfkill_set_sw_state(rfkill
, blocked
);
520 rfkill
->persistent
= true;
521 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
523 EXPORT_SYMBOL(rfkill_init_sw_state
);
525 void rfkill_set_states(struct rfkill
*rfkill
, bool sw
, bool hw
)
532 spin_lock_irqsave(&rfkill
->lock
, flags
);
535 * No need to care about prev/setblock ... this is for uevent only
536 * and that will get triggered by rfkill_set_block anyway.
538 swprev
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
539 hwprev
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
540 __rfkill_set_sw_state(rfkill
, sw
);
542 rfkill
->state
|= RFKILL_BLOCK_HW
;
544 rfkill
->state
&= ~RFKILL_BLOCK_HW
;
546 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
548 if (!rfkill
->registered
) {
549 rfkill
->persistent
= true;
551 if (swprev
!= sw
|| hwprev
!= hw
)
552 schedule_work(&rfkill
->uevent_work
);
554 rfkill_led_trigger_event(rfkill
);
557 EXPORT_SYMBOL(rfkill_set_states
);
559 static ssize_t
rfkill_name_show(struct device
*dev
,
560 struct device_attribute
*attr
,
563 struct rfkill
*rfkill
= to_rfkill(dev
);
565 return sprintf(buf
, "%s\n", rfkill
->name
);
568 static const char *rfkill_get_type_str(enum rfkill_type type
)
570 BUILD_BUG_ON(NUM_RFKILL_TYPES
!= RFKILL_TYPE_FM
+ 1);
573 case RFKILL_TYPE_WLAN
:
575 case RFKILL_TYPE_BLUETOOTH
:
577 case RFKILL_TYPE_UWB
:
578 return "ultrawideband";
579 case RFKILL_TYPE_WIMAX
:
581 case RFKILL_TYPE_WWAN
:
583 case RFKILL_TYPE_GPS
:
592 static ssize_t
rfkill_type_show(struct device
*dev
,
593 struct device_attribute
*attr
,
596 struct rfkill
*rfkill
= to_rfkill(dev
);
598 return sprintf(buf
, "%s\n", rfkill_get_type_str(rfkill
->type
));
601 static ssize_t
rfkill_idx_show(struct device
*dev
,
602 struct device_attribute
*attr
,
605 struct rfkill
*rfkill
= to_rfkill(dev
);
607 return sprintf(buf
, "%d\n", rfkill
->idx
);
610 static ssize_t
rfkill_persistent_show(struct device
*dev
,
611 struct device_attribute
*attr
,
614 struct rfkill
*rfkill
= to_rfkill(dev
);
616 return sprintf(buf
, "%d\n", rfkill
->persistent
);
619 static ssize_t
rfkill_hard_show(struct device
*dev
,
620 struct device_attribute
*attr
,
623 struct rfkill
*rfkill
= to_rfkill(dev
);
625 return sprintf(buf
, "%d\n", (rfkill
->state
& RFKILL_BLOCK_HW
) ? 1 : 0 );
628 static ssize_t
rfkill_soft_show(struct device
*dev
,
629 struct device_attribute
*attr
,
632 struct rfkill
*rfkill
= to_rfkill(dev
);
634 return sprintf(buf
, "%d\n", (rfkill
->state
& RFKILL_BLOCK_SW
) ? 1 : 0 );
637 static ssize_t
rfkill_soft_store(struct device
*dev
,
638 struct device_attribute
*attr
,
639 const char *buf
, size_t count
)
641 struct rfkill
*rfkill
= to_rfkill(dev
);
645 if (!capable(CAP_NET_ADMIN
))
648 err
= kstrtoul(buf
, 0, &state
);
655 mutex_lock(&rfkill_global_mutex
);
656 rfkill_set_block(rfkill
, state
);
657 mutex_unlock(&rfkill_global_mutex
);
662 static u8
user_state_from_blocked(unsigned long state
)
664 if (state
& RFKILL_BLOCK_HW
)
665 return RFKILL_USER_STATE_HARD_BLOCKED
;
666 if (state
& RFKILL_BLOCK_SW
)
667 return RFKILL_USER_STATE_SOFT_BLOCKED
;
669 return RFKILL_USER_STATE_UNBLOCKED
;
672 static ssize_t
rfkill_state_show(struct device
*dev
,
673 struct device_attribute
*attr
,
676 struct rfkill
*rfkill
= to_rfkill(dev
);
678 return sprintf(buf
, "%d\n", user_state_from_blocked(rfkill
->state
));
681 static ssize_t
rfkill_state_store(struct device
*dev
,
682 struct device_attribute
*attr
,
683 const char *buf
, size_t count
)
685 struct rfkill
*rfkill
= to_rfkill(dev
);
689 if (!capable(CAP_NET_ADMIN
))
692 err
= kstrtoul(buf
, 0, &state
);
696 if (state
!= RFKILL_USER_STATE_SOFT_BLOCKED
&&
697 state
!= RFKILL_USER_STATE_UNBLOCKED
)
700 mutex_lock(&rfkill_global_mutex
);
701 rfkill_set_block(rfkill
, state
== RFKILL_USER_STATE_SOFT_BLOCKED
);
702 mutex_unlock(&rfkill_global_mutex
);
707 static ssize_t
rfkill_claim_show(struct device
*dev
,
708 struct device_attribute
*attr
,
711 return sprintf(buf
, "%d\n", 0);
714 static ssize_t
rfkill_claim_store(struct device
*dev
,
715 struct device_attribute
*attr
,
716 const char *buf
, size_t count
)
721 static struct device_attribute rfkill_dev_attrs
[] = {
722 __ATTR(name
, S_IRUGO
, rfkill_name_show
, NULL
),
723 __ATTR(type
, S_IRUGO
, rfkill_type_show
, NULL
),
724 __ATTR(index
, S_IRUGO
, rfkill_idx_show
, NULL
),
725 __ATTR(persistent
, S_IRUGO
, rfkill_persistent_show
, NULL
),
726 __ATTR(state
, S_IRUGO
|S_IWUSR
, rfkill_state_show
, rfkill_state_store
),
727 __ATTR(claim
, S_IRUGO
|S_IWUSR
, rfkill_claim_show
, rfkill_claim_store
),
728 __ATTR(soft
, S_IRUGO
|S_IWUSR
, rfkill_soft_show
, rfkill_soft_store
),
729 __ATTR(hard
, S_IRUGO
, rfkill_hard_show
, NULL
),
733 static void rfkill_release(struct device
*dev
)
735 struct rfkill
*rfkill
= to_rfkill(dev
);
740 static int rfkill_dev_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
742 struct rfkill
*rfkill
= to_rfkill(dev
);
747 error
= add_uevent_var(env
, "RFKILL_NAME=%s", rfkill
->name
);
750 error
= add_uevent_var(env
, "RFKILL_TYPE=%s",
751 rfkill_get_type_str(rfkill
->type
));
754 spin_lock_irqsave(&rfkill
->lock
, flags
);
755 state
= rfkill
->state
;
756 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
757 error
= add_uevent_var(env
, "RFKILL_STATE=%d",
758 user_state_from_blocked(state
));
762 void rfkill_pause_polling(struct rfkill
*rfkill
)
766 if (!rfkill
->ops
->poll
)
769 cancel_delayed_work_sync(&rfkill
->poll_work
);
771 EXPORT_SYMBOL(rfkill_pause_polling
);
773 void rfkill_resume_polling(struct rfkill
*rfkill
)
777 if (!rfkill
->ops
->poll
)
780 schedule_work(&rfkill
->poll_work
.work
);
782 EXPORT_SYMBOL(rfkill_resume_polling
);
784 static int rfkill_suspend(struct device
*dev
, pm_message_t state
)
786 struct rfkill
*rfkill
= to_rfkill(dev
);
788 rfkill_pause_polling(rfkill
);
793 static int rfkill_resume(struct device
*dev
)
795 struct rfkill
*rfkill
= to_rfkill(dev
);
798 if (!rfkill
->persistent
) {
799 cur
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
800 rfkill_set_block(rfkill
, cur
);
803 rfkill_resume_polling(rfkill
);
808 static struct class rfkill_class
= {
810 .dev_release
= rfkill_release
,
811 .dev_attrs
= rfkill_dev_attrs
,
812 .dev_uevent
= rfkill_dev_uevent
,
813 .suspend
= rfkill_suspend
,
814 .resume
= rfkill_resume
,
817 bool rfkill_blocked(struct rfkill
*rfkill
)
822 spin_lock_irqsave(&rfkill
->lock
, flags
);
823 state
= rfkill
->state
;
824 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
826 return !!(state
& RFKILL_BLOCK_ANY
);
828 EXPORT_SYMBOL(rfkill_blocked
);
831 struct rfkill
* __must_check
rfkill_alloc(const char *name
,
832 struct device
*parent
,
833 const enum rfkill_type type
,
834 const struct rfkill_ops
*ops
,
837 struct rfkill
*rfkill
;
843 if (WARN_ON(!ops
->set_block
))
849 if (WARN_ON(type
== RFKILL_TYPE_ALL
|| type
>= NUM_RFKILL_TYPES
))
852 rfkill
= kzalloc(sizeof(*rfkill
), GFP_KERNEL
);
856 spin_lock_init(&rfkill
->lock
);
857 INIT_LIST_HEAD(&rfkill
->node
);
861 rfkill
->data
= ops_data
;
864 dev
->class = &rfkill_class
;
865 dev
->parent
= parent
;
866 device_initialize(dev
);
870 EXPORT_SYMBOL(rfkill_alloc
);
872 static void rfkill_poll(struct work_struct
*work
)
874 struct rfkill
*rfkill
;
876 rfkill
= container_of(work
, struct rfkill
, poll_work
.work
);
879 * Poll hardware state -- driver will use one of the
880 * rfkill_set{,_hw,_sw}_state functions and use its
881 * return value to update the current status.
883 rfkill
->ops
->poll(rfkill
, rfkill
->data
);
885 schedule_delayed_work(&rfkill
->poll_work
,
886 round_jiffies_relative(POLL_INTERVAL
));
889 static void rfkill_uevent_work(struct work_struct
*work
)
891 struct rfkill
*rfkill
;
893 rfkill
= container_of(work
, struct rfkill
, uevent_work
);
895 mutex_lock(&rfkill_global_mutex
);
896 rfkill_event(rfkill
);
897 mutex_unlock(&rfkill_global_mutex
);
900 static void rfkill_sync_work(struct work_struct
*work
)
902 struct rfkill
*rfkill
;
905 rfkill
= container_of(work
, struct rfkill
, sync_work
);
907 mutex_lock(&rfkill_global_mutex
);
908 cur
= rfkill_global_states
[rfkill
->type
].cur
;
909 rfkill_set_block(rfkill
, cur
);
910 mutex_unlock(&rfkill_global_mutex
);
913 int __must_check
rfkill_register(struct rfkill
*rfkill
)
915 static unsigned long rfkill_no
;
916 struct device
*dev
= &rfkill
->dev
;
921 mutex_lock(&rfkill_global_mutex
);
923 if (rfkill
->registered
) {
928 rfkill
->idx
= rfkill_no
;
929 dev_set_name(dev
, "rfkill%lu", rfkill_no
);
932 list_add_tail(&rfkill
->node
, &rfkill_list
);
934 error
= device_add(dev
);
938 error
= rfkill_led_trigger_register(rfkill
);
942 rfkill
->registered
= true;
944 INIT_DELAYED_WORK(&rfkill
->poll_work
, rfkill_poll
);
945 INIT_WORK(&rfkill
->uevent_work
, rfkill_uevent_work
);
946 INIT_WORK(&rfkill
->sync_work
, rfkill_sync_work
);
948 if (rfkill
->ops
->poll
)
949 schedule_delayed_work(&rfkill
->poll_work
,
950 round_jiffies_relative(POLL_INTERVAL
));
952 if (!rfkill
->persistent
|| rfkill_epo_lock_active
) {
953 schedule_work(&rfkill
->sync_work
);
955 #ifdef CONFIG_RFKILL_INPUT
956 bool soft_blocked
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
958 if (!atomic_read(&rfkill_input_disabled
))
959 __rfkill_switch_all(rfkill
->type
, soft_blocked
);
963 rfkill_send_events(rfkill
, RFKILL_OP_ADD
);
965 mutex_unlock(&rfkill_global_mutex
);
969 device_del(&rfkill
->dev
);
971 list_del_init(&rfkill
->node
);
973 mutex_unlock(&rfkill_global_mutex
);
976 EXPORT_SYMBOL(rfkill_register
);
978 void rfkill_unregister(struct rfkill
*rfkill
)
982 if (rfkill
->ops
->poll
)
983 cancel_delayed_work_sync(&rfkill
->poll_work
);
985 cancel_work_sync(&rfkill
->uevent_work
);
986 cancel_work_sync(&rfkill
->sync_work
);
988 rfkill
->registered
= false;
990 device_del(&rfkill
->dev
);
992 mutex_lock(&rfkill_global_mutex
);
993 rfkill_send_events(rfkill
, RFKILL_OP_DEL
);
994 list_del_init(&rfkill
->node
);
995 mutex_unlock(&rfkill_global_mutex
);
997 rfkill_led_trigger_unregister(rfkill
);
999 EXPORT_SYMBOL(rfkill_unregister
);
1001 void rfkill_destroy(struct rfkill
*rfkill
)
1004 put_device(&rfkill
->dev
);
1006 EXPORT_SYMBOL(rfkill_destroy
);
1008 static int rfkill_fop_open(struct inode
*inode
, struct file
*file
)
1010 struct rfkill_data
*data
;
1011 struct rfkill
*rfkill
;
1012 struct rfkill_int_event
*ev
, *tmp
;
1014 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
1018 INIT_LIST_HEAD(&data
->events
);
1019 mutex_init(&data
->mtx
);
1020 init_waitqueue_head(&data
->read_wait
);
1022 mutex_lock(&rfkill_global_mutex
);
1023 mutex_lock(&data
->mtx
);
1025 * start getting events from elsewhere but hold mtx to get
1026 * startup events added first
1029 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
1030 ev
= kzalloc(sizeof(*ev
), GFP_KERNEL
);
1033 rfkill_fill_event(&ev
->ev
, rfkill
, RFKILL_OP_ADD
);
1034 list_add_tail(&ev
->list
, &data
->events
);
1036 list_add(&data
->list
, &rfkill_fds
);
1037 mutex_unlock(&data
->mtx
);
1038 mutex_unlock(&rfkill_global_mutex
);
1040 file
->private_data
= data
;
1042 return nonseekable_open(inode
, file
);
1045 mutex_unlock(&data
->mtx
);
1046 mutex_unlock(&rfkill_global_mutex
);
1047 mutex_destroy(&data
->mtx
);
1048 list_for_each_entry_safe(ev
, tmp
, &data
->events
, list
)
1054 static unsigned int rfkill_fop_poll(struct file
*file
, poll_table
*wait
)
1056 struct rfkill_data
*data
= file
->private_data
;
1057 unsigned int res
= POLLOUT
| POLLWRNORM
;
1059 poll_wait(file
, &data
->read_wait
, wait
);
1061 mutex_lock(&data
->mtx
);
1062 if (!list_empty(&data
->events
))
1063 res
= POLLIN
| POLLRDNORM
;
1064 mutex_unlock(&data
->mtx
);
1069 static bool rfkill_readable(struct rfkill_data
*data
)
1073 mutex_lock(&data
->mtx
);
1074 r
= !list_empty(&data
->events
);
1075 mutex_unlock(&data
->mtx
);
1080 static ssize_t
rfkill_fop_read(struct file
*file
, char __user
*buf
,
1081 size_t count
, loff_t
*pos
)
1083 struct rfkill_data
*data
= file
->private_data
;
1084 struct rfkill_int_event
*ev
;
1088 mutex_lock(&data
->mtx
);
1090 while (list_empty(&data
->events
)) {
1091 if (file
->f_flags
& O_NONBLOCK
) {
1095 mutex_unlock(&data
->mtx
);
1096 ret
= wait_event_interruptible(data
->read_wait
,
1097 rfkill_readable(data
));
1098 mutex_lock(&data
->mtx
);
1104 ev
= list_first_entry(&data
->events
, struct rfkill_int_event
,
1107 sz
= min_t(unsigned long, sizeof(ev
->ev
), count
);
1109 if (copy_to_user(buf
, &ev
->ev
, sz
))
1112 list_del(&ev
->list
);
1115 mutex_unlock(&data
->mtx
);
1119 static ssize_t
rfkill_fop_write(struct file
*file
, const char __user
*buf
,
1120 size_t count
, loff_t
*pos
)
1122 struct rfkill
*rfkill
;
1123 struct rfkill_event ev
;
1125 /* we don't need the 'hard' variable but accept it */
1126 if (count
< RFKILL_EVENT_SIZE_V1
- 1)
1130 * Copy as much data as we can accept into our 'ev' buffer,
1131 * but tell userspace how much we've copied so it can determine
1132 * our API version even in a write() call, if it cares.
1134 count
= min(count
, sizeof(ev
));
1135 if (copy_from_user(&ev
, buf
, count
))
1138 if (ev
.op
!= RFKILL_OP_CHANGE
&& ev
.op
!= RFKILL_OP_CHANGE_ALL
)
1141 if (ev
.type
>= NUM_RFKILL_TYPES
)
1144 mutex_lock(&rfkill_global_mutex
);
1146 if (ev
.op
== RFKILL_OP_CHANGE_ALL
) {
1147 if (ev
.type
== RFKILL_TYPE_ALL
) {
1149 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
1150 rfkill_global_states
[i
].cur
= ev
.soft
;
1152 rfkill_global_states
[ev
.type
].cur
= ev
.soft
;
1156 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
1157 if (rfkill
->idx
!= ev
.idx
&& ev
.op
!= RFKILL_OP_CHANGE_ALL
)
1160 if (rfkill
->type
!= ev
.type
&& ev
.type
!= RFKILL_TYPE_ALL
)
1163 rfkill_set_block(rfkill
, ev
.soft
);
1165 mutex_unlock(&rfkill_global_mutex
);
1170 static int rfkill_fop_release(struct inode
*inode
, struct file
*file
)
1172 struct rfkill_data
*data
= file
->private_data
;
1173 struct rfkill_int_event
*ev
, *tmp
;
1175 mutex_lock(&rfkill_global_mutex
);
1176 list_del(&data
->list
);
1177 mutex_unlock(&rfkill_global_mutex
);
1179 mutex_destroy(&data
->mtx
);
1180 list_for_each_entry_safe(ev
, tmp
, &data
->events
, list
)
1183 #ifdef CONFIG_RFKILL_INPUT
1184 if (data
->input_handler
)
1185 if (atomic_dec_return(&rfkill_input_disabled
) == 0)
1186 printk(KERN_DEBUG
"rfkill: input handler enabled\n");
1194 #ifdef CONFIG_RFKILL_INPUT
1195 static long rfkill_fop_ioctl(struct file
*file
, unsigned int cmd
,
1198 struct rfkill_data
*data
= file
->private_data
;
1200 if (_IOC_TYPE(cmd
) != RFKILL_IOC_MAGIC
)
1203 if (_IOC_NR(cmd
) != RFKILL_IOC_NOINPUT
)
1206 mutex_lock(&data
->mtx
);
1208 if (!data
->input_handler
) {
1209 if (atomic_inc_return(&rfkill_input_disabled
) == 1)
1210 printk(KERN_DEBUG
"rfkill: input handler disabled\n");
1211 data
->input_handler
= true;
1214 mutex_unlock(&data
->mtx
);
1220 static const struct file_operations rfkill_fops
= {
1221 .owner
= THIS_MODULE
,
1222 .open
= rfkill_fop_open
,
1223 .read
= rfkill_fop_read
,
1224 .write
= rfkill_fop_write
,
1225 .poll
= rfkill_fop_poll
,
1226 .release
= rfkill_fop_release
,
1227 #ifdef CONFIG_RFKILL_INPUT
1228 .unlocked_ioctl
= rfkill_fop_ioctl
,
1229 .compat_ioctl
= rfkill_fop_ioctl
,
1231 .llseek
= no_llseek
,
1234 static struct miscdevice rfkill_miscdev
= {
1236 .fops
= &rfkill_fops
,
1237 .minor
= MISC_DYNAMIC_MINOR
,
1240 static int __init
rfkill_init(void)
1245 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
1246 rfkill_global_states
[i
].cur
= !rfkill_default_state
;
1248 error
= class_register(&rfkill_class
);
1252 error
= misc_register(&rfkill_miscdev
);
1254 class_unregister(&rfkill_class
);
1258 #ifdef CONFIG_RFKILL_INPUT
1259 error
= rfkill_handler_init();
1261 misc_deregister(&rfkill_miscdev
);
1262 class_unregister(&rfkill_class
);
1270 subsys_initcall(rfkill_init
);
1272 static void __exit
rfkill_exit(void)
1274 #ifdef CONFIG_RFKILL_INPUT
1275 rfkill_handler_exit();
1277 misc_deregister(&rfkill_miscdev
);
1278 class_unregister(&rfkill_class
);
1280 module_exit(rfkill_exit
);