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 unsigned long rfkill_states_default_locked
;
124 static bool rfkill_epo_lock_active
;
127 #ifdef CONFIG_RFKILL_LEDS
128 static void rfkill_led_trigger_event(struct rfkill
*rfkill
)
130 struct led_trigger
*trigger
;
132 if (!rfkill
->registered
)
135 trigger
= &rfkill
->led_trigger
;
137 if (rfkill
->state
& RFKILL_BLOCK_ANY
)
138 led_trigger_event(trigger
, LED_OFF
);
140 led_trigger_event(trigger
, LED_FULL
);
143 static void rfkill_led_trigger_activate(struct led_classdev
*led
)
145 struct rfkill
*rfkill
;
147 rfkill
= container_of(led
->trigger
, struct rfkill
, led_trigger
);
149 rfkill_led_trigger_event(rfkill
);
152 const char *rfkill_get_led_trigger_name(struct rfkill
*rfkill
)
154 return rfkill
->led_trigger
.name
;
156 EXPORT_SYMBOL(rfkill_get_led_trigger_name
);
158 void rfkill_set_led_trigger_name(struct rfkill
*rfkill
, const char *name
)
162 rfkill
->ledtrigname
= name
;
164 EXPORT_SYMBOL(rfkill_set_led_trigger_name
);
166 static int rfkill_led_trigger_register(struct rfkill
*rfkill
)
168 rfkill
->led_trigger
.name
= rfkill
->ledtrigname
169 ? : dev_name(&rfkill
->dev
);
170 rfkill
->led_trigger
.activate
= rfkill_led_trigger_activate
;
171 return led_trigger_register(&rfkill
->led_trigger
);
174 static void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
176 led_trigger_unregister(&rfkill
->led_trigger
);
179 static void rfkill_led_trigger_event(struct rfkill
*rfkill
)
183 static inline int rfkill_led_trigger_register(struct rfkill
*rfkill
)
188 static inline void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
191 #endif /* CONFIG_RFKILL_LEDS */
193 static void rfkill_fill_event(struct rfkill_event
*ev
, struct rfkill
*rfkill
,
194 enum rfkill_operation op
)
198 ev
->idx
= rfkill
->idx
;
199 ev
->type
= rfkill
->type
;
202 spin_lock_irqsave(&rfkill
->lock
, flags
);
203 ev
->hard
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
204 ev
->soft
= !!(rfkill
->state
& (RFKILL_BLOCK_SW
|
205 RFKILL_BLOCK_SW_PREV
));
206 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
209 static void rfkill_send_events(struct rfkill
*rfkill
, enum rfkill_operation op
)
211 struct rfkill_data
*data
;
212 struct rfkill_int_event
*ev
;
214 list_for_each_entry(data
, &rfkill_fds
, list
) {
215 ev
= kzalloc(sizeof(*ev
), GFP_KERNEL
);
218 rfkill_fill_event(&ev
->ev
, rfkill
, op
);
219 mutex_lock(&data
->mtx
);
220 list_add_tail(&ev
->list
, &data
->events
);
221 mutex_unlock(&data
->mtx
);
222 wake_up_interruptible(&data
->read_wait
);
226 static void rfkill_event(struct rfkill
*rfkill
)
228 if (!rfkill
->registered
|| rfkill
->suspended
)
231 kobject_uevent(&rfkill
->dev
.kobj
, KOBJ_CHANGE
);
233 /* also send event to /dev/rfkill */
234 rfkill_send_events(rfkill
, RFKILL_OP_CHANGE
);
237 static bool __rfkill_set_hw_state(struct rfkill
*rfkill
,
238 bool blocked
, bool *change
)
245 spin_lock_irqsave(&rfkill
->lock
, flags
);
246 prev
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
248 rfkill
->state
|= RFKILL_BLOCK_HW
;
250 rfkill
->state
&= ~RFKILL_BLOCK_HW
;
251 *change
= prev
!= blocked
;
252 any
= rfkill
->state
& RFKILL_BLOCK_ANY
;
253 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
255 rfkill_led_trigger_event(rfkill
);
261 * rfkill_set_block - wrapper for set_block method
263 * @rfkill: the rfkill struct to use
264 * @blocked: the new software state
266 * Calls the set_block method (when applicable) and handles notifications
269 static void rfkill_set_block(struct rfkill
*rfkill
, bool blocked
)
275 * Some platforms (...!) generate input events which affect the
276 * _hard_ kill state -- whenever something tries to change the
277 * current software state query the hardware state too.
279 if (rfkill
->ops
->query
)
280 rfkill
->ops
->query(rfkill
, rfkill
->data
);
282 spin_lock_irqsave(&rfkill
->lock
, flags
);
283 if (rfkill
->state
& RFKILL_BLOCK_SW
)
284 rfkill
->state
|= RFKILL_BLOCK_SW_PREV
;
286 rfkill
->state
&= ~RFKILL_BLOCK_SW_PREV
;
289 rfkill
->state
|= RFKILL_BLOCK_SW
;
291 rfkill
->state
&= ~RFKILL_BLOCK_SW
;
293 rfkill
->state
|= RFKILL_BLOCK_SW_SETCALL
;
294 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
296 if (unlikely(rfkill
->dev
.power
.power_state
.event
& PM_EVENT_SLEEP
))
299 err
= rfkill
->ops
->set_block(rfkill
->data
, blocked
);
301 spin_lock_irqsave(&rfkill
->lock
, flags
);
304 * Failed -- reset status to _prev, this may be different
305 * from what set set _PREV to earlier in this function
306 * if rfkill_set_sw_state was invoked.
308 if (rfkill
->state
& RFKILL_BLOCK_SW_PREV
)
309 rfkill
->state
|= RFKILL_BLOCK_SW
;
311 rfkill
->state
&= ~RFKILL_BLOCK_SW
;
313 rfkill
->state
&= ~RFKILL_BLOCK_SW_SETCALL
;
314 rfkill
->state
&= ~RFKILL_BLOCK_SW_PREV
;
315 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
317 rfkill_led_trigger_event(rfkill
);
318 rfkill_event(rfkill
);
321 #ifdef CONFIG_RFKILL_INPUT
322 static atomic_t rfkill_input_disabled
= ATOMIC_INIT(0);
325 * __rfkill_switch_all - Toggle state of all switches of given type
326 * @type: type of interfaces to be affected
327 * @state: the new state
329 * This function sets the state of all switches of given type,
330 * unless a specific switch is claimed by userspace (in which case,
331 * that switch is left alone) or suspended.
333 * Caller must have acquired rfkill_global_mutex.
335 static void __rfkill_switch_all(const enum rfkill_type type
, bool blocked
)
337 struct rfkill
*rfkill
;
339 rfkill_global_states
[type
].cur
= blocked
;
340 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
341 if (rfkill
->type
!= type
)
344 rfkill_set_block(rfkill
, blocked
);
349 * rfkill_switch_all - Toggle state of all switches of given type
350 * @type: type of interfaces to be affected
351 * @state: the new state
353 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
354 * Please refer to __rfkill_switch_all() for details.
356 * Does nothing if the EPO lock is active.
358 void rfkill_switch_all(enum rfkill_type type
, bool blocked
)
360 if (atomic_read(&rfkill_input_disabled
))
363 mutex_lock(&rfkill_global_mutex
);
365 if (!rfkill_epo_lock_active
)
366 __rfkill_switch_all(type
, blocked
);
368 mutex_unlock(&rfkill_global_mutex
);
372 * rfkill_epo - emergency power off all transmitters
374 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
375 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
377 * The global state before the EPO is saved and can be restored later
378 * using rfkill_restore_states().
380 void rfkill_epo(void)
382 struct rfkill
*rfkill
;
385 if (atomic_read(&rfkill_input_disabled
))
388 mutex_lock(&rfkill_global_mutex
);
390 rfkill_epo_lock_active
= true;
391 list_for_each_entry(rfkill
, &rfkill_list
, node
)
392 rfkill_set_block(rfkill
, true);
394 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++) {
395 rfkill_global_states
[i
].def
= rfkill_global_states
[i
].cur
;
396 rfkill_global_states
[i
].cur
= true;
399 mutex_unlock(&rfkill_global_mutex
);
403 * rfkill_restore_states - restore global states
405 * Restore (and sync switches to) the global state from the
406 * states in rfkill_default_states. This can undo the effects of
407 * a call to rfkill_epo().
409 void rfkill_restore_states(void)
413 if (atomic_read(&rfkill_input_disabled
))
416 mutex_lock(&rfkill_global_mutex
);
418 rfkill_epo_lock_active
= false;
419 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
420 __rfkill_switch_all(i
, rfkill_global_states
[i
].def
);
421 mutex_unlock(&rfkill_global_mutex
);
425 * rfkill_remove_epo_lock - unlock state changes
427 * Used by rfkill-input manually unlock state changes, when
428 * the EPO switch is deactivated.
430 void rfkill_remove_epo_lock(void)
432 if (atomic_read(&rfkill_input_disabled
))
435 mutex_lock(&rfkill_global_mutex
);
436 rfkill_epo_lock_active
= false;
437 mutex_unlock(&rfkill_global_mutex
);
441 * rfkill_is_epo_lock_active - returns true EPO is active
443 * Returns 0 (false) if there is NOT an active EPO contidion,
444 * and 1 (true) if there is an active EPO contition, which
445 * locks all radios in one of the BLOCKED states.
447 * Can be called in atomic context.
449 bool rfkill_is_epo_lock_active(void)
451 return rfkill_epo_lock_active
;
455 * rfkill_get_global_sw_state - returns global state for a type
456 * @type: the type to get the global state of
458 * Returns the current global state for a given wireless
461 bool rfkill_get_global_sw_state(const enum rfkill_type type
)
463 return rfkill_global_states
[type
].cur
;
467 void rfkill_set_global_sw_state(const enum rfkill_type type
, bool blocked
)
469 BUG_ON(type
== RFKILL_TYPE_ALL
);
471 mutex_lock(&rfkill_global_mutex
);
473 /* don't allow unblock when epo */
474 if (rfkill_epo_lock_active
&& !blocked
)
478 if (rfkill_states_default_locked
& BIT(type
))
481 rfkill_states_default_locked
|= BIT(type
);
483 rfkill_global_states
[type
].cur
= blocked
;
484 rfkill_global_states
[type
].def
= blocked
;
486 mutex_unlock(&rfkill_global_mutex
);
488 EXPORT_SYMBOL(rfkill_set_global_sw_state
);
491 bool rfkill_set_hw_state(struct rfkill
*rfkill
, bool blocked
)
495 ret
= __rfkill_set_hw_state(rfkill
, blocked
, &change
);
497 if (!rfkill
->registered
)
501 schedule_work(&rfkill
->uevent_work
);
505 EXPORT_SYMBOL(rfkill_set_hw_state
);
507 static void __rfkill_set_sw_state(struct rfkill
*rfkill
, bool blocked
)
509 u32 bit
= RFKILL_BLOCK_SW
;
511 /* if in a ops->set_block right now, use other bit */
512 if (rfkill
->state
& RFKILL_BLOCK_SW_SETCALL
)
513 bit
= RFKILL_BLOCK_SW_PREV
;
516 rfkill
->state
|= bit
;
518 rfkill
->state
&= ~bit
;
521 bool rfkill_set_sw_state(struct rfkill
*rfkill
, bool blocked
)
528 spin_lock_irqsave(&rfkill
->lock
, flags
);
529 prev
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
530 __rfkill_set_sw_state(rfkill
, blocked
);
531 hwblock
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
532 blocked
= blocked
|| hwblock
;
533 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
535 if (!rfkill
->registered
)
538 if (prev
!= blocked
&& !hwblock
)
539 schedule_work(&rfkill
->uevent_work
);
541 rfkill_led_trigger_event(rfkill
);
545 EXPORT_SYMBOL(rfkill_set_sw_state
);
547 void rfkill_set_states(struct rfkill
*rfkill
, bool sw
, bool hw
)
554 spin_lock_irqsave(&rfkill
->lock
, flags
);
557 * No need to care about prev/setblock ... this is for uevent only
558 * and that will get triggered by rfkill_set_block anyway.
560 swprev
= !!(rfkill
->state
& RFKILL_BLOCK_SW
);
561 hwprev
= !!(rfkill
->state
& RFKILL_BLOCK_HW
);
562 __rfkill_set_sw_state(rfkill
, sw
);
564 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
566 if (!rfkill
->registered
)
569 if (swprev
!= sw
|| hwprev
!= hw
)
570 schedule_work(&rfkill
->uevent_work
);
572 rfkill_led_trigger_event(rfkill
);
574 EXPORT_SYMBOL(rfkill_set_states
);
576 static ssize_t
rfkill_name_show(struct device
*dev
,
577 struct device_attribute
*attr
,
580 struct rfkill
*rfkill
= to_rfkill(dev
);
582 return sprintf(buf
, "%s\n", rfkill
->name
);
585 static const char *rfkill_get_type_str(enum rfkill_type type
)
588 case RFKILL_TYPE_WLAN
:
590 case RFKILL_TYPE_BLUETOOTH
:
592 case RFKILL_TYPE_UWB
:
593 return "ultrawideband";
594 case RFKILL_TYPE_WIMAX
:
596 case RFKILL_TYPE_WWAN
:
602 BUILD_BUG_ON(NUM_RFKILL_TYPES
!= RFKILL_TYPE_WWAN
+ 1);
605 static ssize_t
rfkill_type_show(struct device
*dev
,
606 struct device_attribute
*attr
,
609 struct rfkill
*rfkill
= to_rfkill(dev
);
611 return sprintf(buf
, "%s\n", rfkill_get_type_str(rfkill
->type
));
614 static ssize_t
rfkill_idx_show(struct device
*dev
,
615 struct device_attribute
*attr
,
618 struct rfkill
*rfkill
= to_rfkill(dev
);
620 return sprintf(buf
, "%d\n", rfkill
->idx
);
623 static u8
user_state_from_blocked(unsigned long state
)
625 if (state
& RFKILL_BLOCK_HW
)
626 return RFKILL_USER_STATE_HARD_BLOCKED
;
627 if (state
& RFKILL_BLOCK_SW
)
628 return RFKILL_USER_STATE_SOFT_BLOCKED
;
630 return RFKILL_USER_STATE_UNBLOCKED
;
633 static ssize_t
rfkill_state_show(struct device
*dev
,
634 struct device_attribute
*attr
,
637 struct rfkill
*rfkill
= to_rfkill(dev
);
641 spin_lock_irqsave(&rfkill
->lock
, flags
);
642 state
= rfkill
->state
;
643 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
645 return sprintf(buf
, "%d\n", user_state_from_blocked(state
));
648 static ssize_t
rfkill_state_store(struct device
*dev
,
649 struct device_attribute
*attr
,
650 const char *buf
, size_t count
)
653 * The intention was that userspace can only take control over
654 * a given device when/if rfkill-input doesn't control it due
655 * to user_claim. Since user_claim is currently unsupported,
656 * we never support changing the state from userspace -- this
657 * can be implemented again later.
663 static ssize_t
rfkill_claim_show(struct device
*dev
,
664 struct device_attribute
*attr
,
667 return sprintf(buf
, "%d\n", 0);
670 static ssize_t
rfkill_claim_store(struct device
*dev
,
671 struct device_attribute
*attr
,
672 const char *buf
, size_t count
)
677 static struct device_attribute rfkill_dev_attrs
[] = {
678 __ATTR(name
, S_IRUGO
, rfkill_name_show
, NULL
),
679 __ATTR(type
, S_IRUGO
, rfkill_type_show
, NULL
),
680 __ATTR(index
, S_IRUGO
, rfkill_idx_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
);
743 rfkill
->suspended
= true;
748 static int rfkill_resume(struct device
*dev
)
750 struct rfkill
*rfkill
= to_rfkill(dev
);
753 mutex_lock(&rfkill_global_mutex
);
754 cur
= rfkill_global_states
[rfkill
->type
].cur
;
755 rfkill_set_block(rfkill
, cur
);
756 mutex_unlock(&rfkill_global_mutex
);
758 rfkill
->suspended
= false;
760 schedule_work(&rfkill
->uevent_work
);
762 rfkill_resume_polling(rfkill
);
767 static struct class rfkill_class
= {
769 .dev_release
= rfkill_release
,
770 .dev_attrs
= rfkill_dev_attrs
,
771 .dev_uevent
= rfkill_dev_uevent
,
772 .suspend
= rfkill_suspend
,
773 .resume
= rfkill_resume
,
776 bool rfkill_blocked(struct rfkill
*rfkill
)
781 spin_lock_irqsave(&rfkill
->lock
, flags
);
782 state
= rfkill
->state
;
783 spin_unlock_irqrestore(&rfkill
->lock
, flags
);
785 return !!(state
& RFKILL_BLOCK_ANY
);
787 EXPORT_SYMBOL(rfkill_blocked
);
790 struct rfkill
* __must_check
rfkill_alloc(const char *name
,
791 struct device
*parent
,
792 const enum rfkill_type type
,
793 const struct rfkill_ops
*ops
,
796 struct rfkill
*rfkill
;
802 if (WARN_ON(!ops
->set_block
))
808 if (WARN_ON(type
== RFKILL_TYPE_ALL
|| type
>= NUM_RFKILL_TYPES
))
811 rfkill
= kzalloc(sizeof(*rfkill
), GFP_KERNEL
);
815 spin_lock_init(&rfkill
->lock
);
816 INIT_LIST_HEAD(&rfkill
->node
);
820 rfkill
->data
= ops_data
;
823 dev
->class = &rfkill_class
;
824 dev
->parent
= parent
;
825 device_initialize(dev
);
829 EXPORT_SYMBOL(rfkill_alloc
);
831 static void rfkill_poll(struct work_struct
*work
)
833 struct rfkill
*rfkill
;
835 rfkill
= container_of(work
, struct rfkill
, poll_work
.work
);
838 * Poll hardware state -- driver will use one of the
839 * rfkill_set{,_hw,_sw}_state functions and use its
840 * return value to update the current status.
842 rfkill
->ops
->poll(rfkill
, rfkill
->data
);
844 schedule_delayed_work(&rfkill
->poll_work
,
845 round_jiffies_relative(POLL_INTERVAL
));
848 static void rfkill_uevent_work(struct work_struct
*work
)
850 struct rfkill
*rfkill
;
852 rfkill
= container_of(work
, struct rfkill
, uevent_work
);
854 mutex_lock(&rfkill_global_mutex
);
855 rfkill_event(rfkill
);
856 mutex_unlock(&rfkill_global_mutex
);
859 static void rfkill_sync_work(struct work_struct
*work
)
861 struct rfkill
*rfkill
;
864 rfkill
= container_of(work
, struct rfkill
, sync_work
);
866 mutex_lock(&rfkill_global_mutex
);
867 cur
= rfkill_global_states
[rfkill
->type
].cur
;
868 rfkill_set_block(rfkill
, cur
);
869 mutex_unlock(&rfkill_global_mutex
);
872 int __must_check
rfkill_register(struct rfkill
*rfkill
)
874 static unsigned long rfkill_no
;
875 struct device
*dev
= &rfkill
->dev
;
880 mutex_lock(&rfkill_global_mutex
);
882 if (rfkill
->registered
) {
887 rfkill
->idx
= rfkill_no
;
888 dev_set_name(dev
, "rfkill%lu", rfkill_no
);
891 if (!(rfkill_states_default_locked
& BIT(rfkill
->type
))) {
892 /* first of its kind */
893 BUILD_BUG_ON(NUM_RFKILL_TYPES
>
894 sizeof(rfkill_states_default_locked
) * 8);
895 rfkill_states_default_locked
|= BIT(rfkill
->type
);
896 rfkill_global_states
[rfkill
->type
].cur
=
897 rfkill_global_states
[rfkill
->type
].def
;
900 list_add_tail(&rfkill
->node
, &rfkill_list
);
902 error
= device_add(dev
);
906 error
= rfkill_led_trigger_register(rfkill
);
910 rfkill
->registered
= true;
912 INIT_DELAYED_WORK(&rfkill
->poll_work
, rfkill_poll
);
913 INIT_WORK(&rfkill
->uevent_work
, rfkill_uevent_work
);
914 INIT_WORK(&rfkill
->sync_work
, rfkill_sync_work
);
916 if (rfkill
->ops
->poll
)
917 schedule_delayed_work(&rfkill
->poll_work
,
918 round_jiffies_relative(POLL_INTERVAL
));
919 schedule_work(&rfkill
->sync_work
);
921 rfkill_send_events(rfkill
, RFKILL_OP_ADD
);
923 mutex_unlock(&rfkill_global_mutex
);
927 device_del(&rfkill
->dev
);
929 list_del_init(&rfkill
->node
);
931 mutex_unlock(&rfkill_global_mutex
);
934 EXPORT_SYMBOL(rfkill_register
);
936 void rfkill_unregister(struct rfkill
*rfkill
)
940 if (rfkill
->ops
->poll
)
941 cancel_delayed_work_sync(&rfkill
->poll_work
);
943 cancel_work_sync(&rfkill
->uevent_work
);
944 cancel_work_sync(&rfkill
->sync_work
);
946 rfkill
->registered
= false;
948 device_del(&rfkill
->dev
);
950 mutex_lock(&rfkill_global_mutex
);
951 rfkill_send_events(rfkill
, RFKILL_OP_DEL
);
952 list_del_init(&rfkill
->node
);
953 mutex_unlock(&rfkill_global_mutex
);
955 rfkill_led_trigger_unregister(rfkill
);
957 EXPORT_SYMBOL(rfkill_unregister
);
959 void rfkill_destroy(struct rfkill
*rfkill
)
962 put_device(&rfkill
->dev
);
964 EXPORT_SYMBOL(rfkill_destroy
);
966 static int rfkill_fop_open(struct inode
*inode
, struct file
*file
)
968 struct rfkill_data
*data
;
969 struct rfkill
*rfkill
;
970 struct rfkill_int_event
*ev
, *tmp
;
972 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
976 INIT_LIST_HEAD(&data
->events
);
977 mutex_init(&data
->mtx
);
978 init_waitqueue_head(&data
->read_wait
);
980 mutex_lock(&rfkill_global_mutex
);
981 mutex_lock(&data
->mtx
);
983 * start getting events from elsewhere but hold mtx to get
984 * startup events added first
986 list_add(&data
->list
, &rfkill_fds
);
988 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
989 ev
= kzalloc(sizeof(*ev
), GFP_KERNEL
);
992 rfkill_fill_event(&ev
->ev
, rfkill
, RFKILL_OP_ADD
);
993 list_add_tail(&ev
->list
, &data
->events
);
995 mutex_unlock(&data
->mtx
);
996 mutex_unlock(&rfkill_global_mutex
);
998 file
->private_data
= data
;
1000 return nonseekable_open(inode
, file
);
1003 mutex_unlock(&data
->mtx
);
1004 mutex_unlock(&rfkill_global_mutex
);
1005 mutex_destroy(&data
->mtx
);
1006 list_for_each_entry_safe(ev
, tmp
, &data
->events
, list
)
1012 static unsigned int rfkill_fop_poll(struct file
*file
, poll_table
*wait
)
1014 struct rfkill_data
*data
= file
->private_data
;
1015 unsigned int res
= POLLOUT
| POLLWRNORM
;
1017 poll_wait(file
, &data
->read_wait
, wait
);
1019 mutex_lock(&data
->mtx
);
1020 if (!list_empty(&data
->events
))
1021 res
= POLLIN
| POLLRDNORM
;
1022 mutex_unlock(&data
->mtx
);
1027 static bool rfkill_readable(struct rfkill_data
*data
)
1031 mutex_lock(&data
->mtx
);
1032 r
= !list_empty(&data
->events
);
1033 mutex_unlock(&data
->mtx
);
1038 static ssize_t
rfkill_fop_read(struct file
*file
, char __user
*buf
,
1039 size_t count
, loff_t
*pos
)
1041 struct rfkill_data
*data
= file
->private_data
;
1042 struct rfkill_int_event
*ev
;
1046 mutex_lock(&data
->mtx
);
1048 while (list_empty(&data
->events
)) {
1049 if (file
->f_flags
& O_NONBLOCK
) {
1053 mutex_unlock(&data
->mtx
);
1054 ret
= wait_event_interruptible(data
->read_wait
,
1055 rfkill_readable(data
));
1056 mutex_lock(&data
->mtx
);
1062 ev
= list_first_entry(&data
->events
, struct rfkill_int_event
,
1065 sz
= min_t(unsigned long, sizeof(ev
->ev
), count
);
1067 if (copy_to_user(buf
, &ev
->ev
, sz
))
1070 list_del(&ev
->list
);
1073 mutex_unlock(&data
->mtx
);
1077 static ssize_t
rfkill_fop_write(struct file
*file
, const char __user
*buf
,
1078 size_t count
, loff_t
*pos
)
1080 struct rfkill
*rfkill
;
1081 struct rfkill_event ev
;
1083 /* we don't need the 'hard' variable but accept it */
1084 if (count
< sizeof(ev
) - 1)
1087 if (copy_from_user(&ev
, buf
, sizeof(ev
) - 1))
1090 if (ev
.op
!= RFKILL_OP_CHANGE
&& ev
.op
!= RFKILL_OP_CHANGE_ALL
)
1093 if (ev
.type
>= NUM_RFKILL_TYPES
)
1096 mutex_lock(&rfkill_global_mutex
);
1098 if (ev
.op
== RFKILL_OP_CHANGE_ALL
) {
1099 if (ev
.type
== RFKILL_TYPE_ALL
) {
1101 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
1102 rfkill_global_states
[i
].cur
= ev
.soft
;
1104 rfkill_global_states
[ev
.type
].cur
= ev
.soft
;
1108 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
1109 if (rfkill
->idx
!= ev
.idx
&& ev
.op
!= RFKILL_OP_CHANGE_ALL
)
1112 if (rfkill
->type
!= ev
.type
&& ev
.type
!= RFKILL_TYPE_ALL
)
1115 rfkill_set_block(rfkill
, ev
.soft
);
1117 mutex_unlock(&rfkill_global_mutex
);
1122 static int rfkill_fop_release(struct inode
*inode
, struct file
*file
)
1124 struct rfkill_data
*data
= file
->private_data
;
1125 struct rfkill_int_event
*ev
, *tmp
;
1127 mutex_lock(&rfkill_global_mutex
);
1128 list_del(&data
->list
);
1129 mutex_unlock(&rfkill_global_mutex
);
1131 mutex_destroy(&data
->mtx
);
1132 list_for_each_entry_safe(ev
, tmp
, &data
->events
, list
)
1135 #ifdef CONFIG_RFKILL_INPUT
1136 if (data
->input_handler
)
1137 atomic_dec(&rfkill_input_disabled
);
1145 #ifdef CONFIG_RFKILL_INPUT
1146 static long rfkill_fop_ioctl(struct file
*file
, unsigned int cmd
,
1149 struct rfkill_data
*data
= file
->private_data
;
1151 if (_IOC_TYPE(cmd
) != RFKILL_IOC_MAGIC
)
1154 if (_IOC_NR(cmd
) != RFKILL_IOC_NOINPUT
)
1157 mutex_lock(&data
->mtx
);
1159 if (!data
->input_handler
) {
1160 atomic_inc(&rfkill_input_disabled
);
1161 data
->input_handler
= true;
1164 mutex_unlock(&data
->mtx
);
1170 static const struct file_operations rfkill_fops
= {
1171 .open
= rfkill_fop_open
,
1172 .read
= rfkill_fop_read
,
1173 .write
= rfkill_fop_write
,
1174 .poll
= rfkill_fop_poll
,
1175 .release
= rfkill_fop_release
,
1176 #ifdef CONFIG_RFKILL_INPUT
1177 .unlocked_ioctl
= rfkill_fop_ioctl
,
1178 .compat_ioctl
= rfkill_fop_ioctl
,
1182 static struct miscdevice rfkill_miscdev
= {
1184 .fops
= &rfkill_fops
,
1185 .minor
= MISC_DYNAMIC_MINOR
,
1188 static int __init
rfkill_init(void)
1193 for (i
= 0; i
< NUM_RFKILL_TYPES
; i
++)
1194 rfkill_global_states
[i
].def
= !rfkill_default_state
;
1196 error
= class_register(&rfkill_class
);
1200 error
= misc_register(&rfkill_miscdev
);
1202 class_unregister(&rfkill_class
);
1206 #ifdef CONFIG_RFKILL_INPUT
1207 error
= rfkill_handler_init();
1209 misc_deregister(&rfkill_miscdev
);
1210 class_unregister(&rfkill_class
);
1218 subsys_initcall(rfkill_init
);
1220 static void __exit
rfkill_exit(void)
1222 #ifdef CONFIG_RFKILL_INPUT
1223 rfkill_handler_exit();
1225 misc_deregister(&rfkill_miscdev
);
1226 class_unregister(&rfkill_class
);
1228 module_exit(rfkill_exit
);