2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the
17 * Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/workqueue.h>
25 #include <linux/capability.h>
26 #include <linux/list.h>
27 #include <linux/mutex.h>
28 #include <linux/rfkill.h>
30 /* Get declaration of rfkill_switch_all() to shut up sparse. */
31 #include "rfkill-input.h"
34 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
35 MODULE_VERSION("1.0");
36 MODULE_DESCRIPTION("RF switch support");
37 MODULE_LICENSE("GPL");
39 static LIST_HEAD(rfkill_list
); /* list of registered rf switches */
40 static DEFINE_MUTEX(rfkill_mutex
);
42 static unsigned int rfkill_default_state
= RFKILL_STATE_UNBLOCKED
;
43 module_param_named(default_state
, rfkill_default_state
, uint
, 0444);
44 MODULE_PARM_DESC(default_state
,
45 "Default initial state for all radio types, 0 = radio off");
47 struct rfkill_gsw_state
{
48 enum rfkill_state current_state
;
49 enum rfkill_state default_state
;
52 static struct rfkill_gsw_state rfkill_global_states
[RFKILL_TYPE_MAX
];
53 static unsigned long rfkill_states_lockdflt
[BITS_TO_LONGS(RFKILL_TYPE_MAX
)];
55 static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list
);
59 * register_rfkill_notifier - Add notifier to rfkill notifier chain
60 * @nb: pointer to the new entry to add to the chain
62 * See blocking_notifier_chain_register() for return value and further
65 * Adds a notifier to the rfkill notifier chain. The chain will be
66 * called with a pointer to the relevant rfkill structure as a parameter,
67 * refer to include/linux/rfkill.h for the possible events.
69 * Notifiers added to this chain are to always return NOTIFY_DONE. This
70 * chain is a blocking notifier chain: notifiers can sleep.
72 * Calls to this chain may have been done through a workqueue. One must
73 * assume unordered asynchronous behaviour, there is no way to know if
74 * actions related to the event that generated the notification have been
75 * carried out already.
77 int register_rfkill_notifier(struct notifier_block
*nb
)
80 return blocking_notifier_chain_register(&rfkill_notifier_list
, nb
);
82 EXPORT_SYMBOL_GPL(register_rfkill_notifier
);
85 * unregister_rfkill_notifier - remove notifier from rfkill notifier chain
86 * @nb: pointer to the entry to remove from the chain
88 * See blocking_notifier_chain_unregister() for return value and further
91 * Removes a notifier from the rfkill notifier chain.
93 int unregister_rfkill_notifier(struct notifier_block
*nb
)
96 return blocking_notifier_chain_unregister(&rfkill_notifier_list
, nb
);
98 EXPORT_SYMBOL_GPL(unregister_rfkill_notifier
);
101 static void rfkill_led_trigger(struct rfkill
*rfkill
,
102 enum rfkill_state state
)
104 #ifdef CONFIG_RFKILL_LEDS
105 struct led_trigger
*led
= &rfkill
->led_trigger
;
109 if (state
!= RFKILL_STATE_UNBLOCKED
)
110 led_trigger_event(led
, LED_OFF
);
112 led_trigger_event(led
, LED_FULL
);
113 #endif /* CONFIG_RFKILL_LEDS */
116 #ifdef CONFIG_RFKILL_LEDS
117 static void rfkill_led_trigger_activate(struct led_classdev
*led
)
119 struct rfkill
*rfkill
= container_of(led
->trigger
,
120 struct rfkill
, led_trigger
);
122 rfkill_led_trigger(rfkill
, rfkill
->state
);
124 #endif /* CONFIG_RFKILL_LEDS */
126 static void notify_rfkill_state_change(struct rfkill
*rfkill
)
128 blocking_notifier_call_chain(&rfkill_notifier_list
,
129 RFKILL_STATE_CHANGED
,
133 static void update_rfkill_state(struct rfkill
*rfkill
)
135 enum rfkill_state newstate
, oldstate
;
137 if (rfkill
->get_state
) {
138 mutex_lock(&rfkill
->mutex
);
139 if (!rfkill
->get_state(rfkill
->data
, &newstate
)) {
140 oldstate
= rfkill
->state
;
141 rfkill
->state
= newstate
;
142 if (oldstate
!= newstate
)
143 notify_rfkill_state_change(rfkill
);
145 mutex_unlock(&rfkill
->mutex
);
150 * rfkill_toggle_radio - wrapper for toggle_radio hook
151 * @rfkill: the rfkill struct to use
152 * @force: calls toggle_radio even if cache says it is not needed,
153 * and also makes sure notifications of the state will be
154 * sent even if it didn't change
155 * @state: the new state to call toggle_radio() with
157 * Calls rfkill->toggle_radio, enforcing the API for toggle_radio
158 * calls and handling all the red tape such as issuing notifications
159 * if the call is successful.
161 * Suspended devices are not touched at all, and -EAGAIN is returned.
163 * Note that the @force parameter cannot override a (possibly cached)
164 * state of RFKILL_STATE_HARD_BLOCKED. Any device making use of
165 * RFKILL_STATE_HARD_BLOCKED implements either get_state() or
166 * rfkill_force_state(), so the cache either is bypassed or valid.
168 * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
169 * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
170 * give the driver a hint that it should double-BLOCK the transmitter.
172 * Caller must have acquired rfkill->mutex.
174 static int rfkill_toggle_radio(struct rfkill
*rfkill
,
175 enum rfkill_state state
,
179 enum rfkill_state oldstate
, newstate
;
181 if (unlikely(rfkill
->dev
.power
.power_state
.event
& PM_EVENT_SLEEP
))
184 oldstate
= rfkill
->state
;
186 if (rfkill
->get_state
&& !force
&&
187 !rfkill
->get_state(rfkill
->data
, &newstate
))
188 rfkill
->state
= newstate
;
191 case RFKILL_STATE_HARD_BLOCKED
:
192 /* typically happens when refreshing hardware state,
193 * such as on resume */
194 state
= RFKILL_STATE_SOFT_BLOCKED
;
196 case RFKILL_STATE_UNBLOCKED
:
197 /* force can't override this, only rfkill_force_state() can */
198 if (rfkill
->state
== RFKILL_STATE_HARD_BLOCKED
)
201 case RFKILL_STATE_SOFT_BLOCKED
:
202 /* nothing to do, we want to give drivers the hint to double
203 * BLOCK even a transmitter that is already in state
204 * RFKILL_STATE_HARD_BLOCKED */
208 "rfkill: illegal state %d passed as parameter "
209 "to rfkill_toggle_radio\n", state
);
213 if (force
|| state
!= rfkill
->state
) {
214 retval
= rfkill
->toggle_radio(rfkill
->data
, state
);
215 /* never allow a HARD->SOFT downgrade! */
216 if (!retval
&& rfkill
->state
!= RFKILL_STATE_HARD_BLOCKED
)
217 rfkill
->state
= state
;
220 if (force
|| rfkill
->state
!= oldstate
) {
221 rfkill_led_trigger(rfkill
, rfkill
->state
);
222 notify_rfkill_state_change(rfkill
);
229 * __rfkill_switch_all - Toggle state of all switches of given type
230 * @type: type of interfaces to be affected
231 * @state: the new state
233 * This function toggles the state of all switches of given type,
234 * unless a specific switch is claimed by userspace (in which case,
235 * that switch is left alone) or suspended.
237 * Caller must have acquired rfkill_mutex.
239 static void __rfkill_switch_all(const enum rfkill_type type
,
240 const enum rfkill_state state
)
242 struct rfkill
*rfkill
;
244 if (WARN((state
>= RFKILL_STATE_MAX
|| type
>= RFKILL_TYPE_MAX
),
246 "rfkill: illegal state %d or type %d "
247 "passed as parameter to __rfkill_switch_all\n",
251 rfkill_global_states
[type
].current_state
= state
;
252 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
253 if ((!rfkill
->user_claim
) && (rfkill
->type
== type
)) {
254 mutex_lock(&rfkill
->mutex
);
255 rfkill_toggle_radio(rfkill
, state
, 0);
256 mutex_unlock(&rfkill
->mutex
);
262 * rfkill_switch_all - Toggle state of all switches of given type
263 * @type: type of interfaces to be affected
264 * @state: the new state
266 * Acquires rfkill_mutex and calls __rfkill_switch_all(@type, @state).
267 * Please refer to __rfkill_switch_all() for details.
269 void rfkill_switch_all(enum rfkill_type type
, enum rfkill_state state
)
271 mutex_lock(&rfkill_mutex
);
272 __rfkill_switch_all(type
, state
);
273 mutex_unlock(&rfkill_mutex
);
275 EXPORT_SYMBOL(rfkill_switch_all
);
278 * rfkill_epo - emergency power off all transmitters
280 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
281 * ignoring everything in its path but rfkill_mutex and rfkill->mutex.
283 * The global state before the EPO is saved and can be restored later
284 * using rfkill_restore_states().
286 void rfkill_epo(void)
288 struct rfkill
*rfkill
;
291 mutex_lock(&rfkill_mutex
);
292 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
293 mutex_lock(&rfkill
->mutex
);
294 rfkill_toggle_radio(rfkill
, RFKILL_STATE_SOFT_BLOCKED
, 1);
295 mutex_unlock(&rfkill
->mutex
);
297 for (i
= 0; i
< RFKILL_TYPE_MAX
; i
++) {
298 rfkill_global_states
[i
].default_state
=
299 rfkill_global_states
[i
].current_state
;
300 rfkill_global_states
[i
].current_state
=
301 RFKILL_STATE_SOFT_BLOCKED
;
303 mutex_unlock(&rfkill_mutex
);
305 EXPORT_SYMBOL_GPL(rfkill_epo
);
308 * rfkill_restore_states - restore global states
310 * Restore (and sync switches to) the global state from the
311 * states in rfkill_default_states. This can undo the effects of
312 * a call to rfkill_epo().
314 void rfkill_restore_states(void)
318 mutex_lock(&rfkill_mutex
);
319 for (i
= 0; i
< RFKILL_TYPE_MAX
; i
++)
320 __rfkill_switch_all(i
, rfkill_global_states
[i
].default_state
);
321 mutex_unlock(&rfkill_mutex
);
323 EXPORT_SYMBOL_GPL(rfkill_restore_states
);
326 * rfkill_force_state - Force the internal rfkill radio state
327 * @rfkill: pointer to the rfkill class to modify.
328 * @state: the current radio state the class should be forced to.
330 * This function updates the internal state of the radio cached
331 * by the rfkill class. It should be used when the driver gets
332 * a notification by the firmware/hardware of the current *real*
333 * state of the radio rfkill switch.
335 * Devices which are subject to external changes on their rfkill
336 * state (such as those caused by a hardware rfkill line) MUST
337 * have their driver arrange to call rfkill_force_state() as soon
338 * as possible after such a change.
340 * This function may not be called from an atomic context.
342 int rfkill_force_state(struct rfkill
*rfkill
, enum rfkill_state state
)
344 enum rfkill_state oldstate
;
347 if (WARN((state
>= RFKILL_STATE_MAX
),
349 "rfkill: illegal state %d passed as parameter "
350 "to rfkill_force_state\n", state
))
353 mutex_lock(&rfkill
->mutex
);
355 oldstate
= rfkill
->state
;
356 rfkill
->state
= state
;
358 if (state
!= oldstate
)
359 notify_rfkill_state_change(rfkill
);
361 mutex_unlock(&rfkill
->mutex
);
365 EXPORT_SYMBOL(rfkill_force_state
);
367 static ssize_t
rfkill_name_show(struct device
*dev
,
368 struct device_attribute
*attr
,
371 struct rfkill
*rfkill
= to_rfkill(dev
);
373 return sprintf(buf
, "%s\n", rfkill
->name
);
376 static const char *rfkill_get_type_str(enum rfkill_type type
)
379 case RFKILL_TYPE_WLAN
:
381 case RFKILL_TYPE_BLUETOOTH
:
383 case RFKILL_TYPE_UWB
:
384 return "ultrawideband";
385 case RFKILL_TYPE_WIMAX
:
387 case RFKILL_TYPE_WWAN
:
394 static ssize_t
rfkill_type_show(struct device
*dev
,
395 struct device_attribute
*attr
,
398 struct rfkill
*rfkill
= to_rfkill(dev
);
400 return sprintf(buf
, "%s\n", rfkill_get_type_str(rfkill
->type
));
403 static ssize_t
rfkill_state_show(struct device
*dev
,
404 struct device_attribute
*attr
,
407 struct rfkill
*rfkill
= to_rfkill(dev
);
409 update_rfkill_state(rfkill
);
410 return sprintf(buf
, "%d\n", rfkill
->state
);
413 static ssize_t
rfkill_state_store(struct device
*dev
,
414 struct device_attribute
*attr
,
415 const char *buf
, size_t count
)
417 struct rfkill
*rfkill
= to_rfkill(dev
);
421 if (!capable(CAP_NET_ADMIN
))
424 error
= strict_strtoul(buf
, 0, &state
);
428 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
429 if (state
!= RFKILL_STATE_UNBLOCKED
&&
430 state
!= RFKILL_STATE_SOFT_BLOCKED
)
433 if (mutex_lock_interruptible(&rfkill
->mutex
))
435 error
= rfkill_toggle_radio(rfkill
, state
, 0);
436 mutex_unlock(&rfkill
->mutex
);
438 return error
? error
: count
;
441 static ssize_t
rfkill_claim_show(struct device
*dev
,
442 struct device_attribute
*attr
,
445 struct rfkill
*rfkill
= to_rfkill(dev
);
447 return sprintf(buf
, "%d\n", rfkill
->user_claim
);
450 static ssize_t
rfkill_claim_store(struct device
*dev
,
451 struct device_attribute
*attr
,
452 const char *buf
, size_t count
)
454 struct rfkill
*rfkill
= to_rfkill(dev
);
455 unsigned long claim_tmp
;
459 if (!capable(CAP_NET_ADMIN
))
462 if (rfkill
->user_claim_unsupported
)
465 error
= strict_strtoul(buf
, 0, &claim_tmp
);
471 * Take the global lock to make sure the kernel is not in
472 * the middle of rfkill_switch_all
474 error
= mutex_lock_interruptible(&rfkill_mutex
);
478 if (rfkill
->user_claim
!= claim
) {
480 mutex_lock(&rfkill
->mutex
);
481 rfkill_toggle_radio(rfkill
,
482 rfkill_global_states
[rfkill
->type
].current_state
,
484 mutex_unlock(&rfkill
->mutex
);
486 rfkill
->user_claim
= claim
;
489 mutex_unlock(&rfkill_mutex
);
491 return error
? error
: count
;
494 static struct device_attribute rfkill_dev_attrs
[] = {
495 __ATTR(name
, S_IRUGO
, rfkill_name_show
, NULL
),
496 __ATTR(type
, S_IRUGO
, rfkill_type_show
, NULL
),
497 __ATTR(state
, S_IRUGO
|S_IWUSR
, rfkill_state_show
, rfkill_state_store
),
498 __ATTR(claim
, S_IRUGO
|S_IWUSR
, rfkill_claim_show
, rfkill_claim_store
),
502 static void rfkill_release(struct device
*dev
)
504 struct rfkill
*rfkill
= to_rfkill(dev
);
507 module_put(THIS_MODULE
);
511 static int rfkill_suspend(struct device
*dev
, pm_message_t state
)
513 struct rfkill
*rfkill
= to_rfkill(dev
);
515 if (dev
->power
.power_state
.event
!= state
.event
) {
516 if (state
.event
& PM_EVENT_SLEEP
) {
517 /* Stop transmitter, keep state, no notifies */
518 update_rfkill_state(rfkill
);
520 mutex_lock(&rfkill
->mutex
);
521 rfkill
->toggle_radio(rfkill
->data
,
522 RFKILL_STATE_SOFT_BLOCKED
);
523 mutex_unlock(&rfkill
->mutex
);
526 dev
->power
.power_state
= state
;
532 static int rfkill_resume(struct device
*dev
)
534 struct rfkill
*rfkill
= to_rfkill(dev
);
536 if (dev
->power
.power_state
.event
!= PM_EVENT_ON
) {
537 mutex_lock(&rfkill
->mutex
);
539 dev
->power
.power_state
.event
= PM_EVENT_ON
;
541 /* restore radio state AND notify everybody */
542 rfkill_toggle_radio(rfkill
, rfkill
->state
, 1);
544 mutex_unlock(&rfkill
->mutex
);
550 #define rfkill_suspend NULL
551 #define rfkill_resume NULL
554 static int rfkill_blocking_uevent_notifier(struct notifier_block
*nb
,
555 unsigned long eventid
,
558 struct rfkill
*rfkill
= (struct rfkill
*)data
;
561 case RFKILL_STATE_CHANGED
:
562 kobject_uevent(&rfkill
->dev
.kobj
, KOBJ_CHANGE
);
571 static struct notifier_block rfkill_blocking_uevent_nb
= {
572 .notifier_call
= rfkill_blocking_uevent_notifier
,
576 static int rfkill_dev_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
578 struct rfkill
*rfkill
= to_rfkill(dev
);
581 error
= add_uevent_var(env
, "RFKILL_NAME=%s", rfkill
->name
);
584 error
= add_uevent_var(env
, "RFKILL_TYPE=%s",
585 rfkill_get_type_str(rfkill
->type
));
588 error
= add_uevent_var(env
, "RFKILL_STATE=%d", rfkill
->state
);
592 static struct class rfkill_class
= {
594 .dev_release
= rfkill_release
,
595 .dev_attrs
= rfkill_dev_attrs
,
596 .suspend
= rfkill_suspend
,
597 .resume
= rfkill_resume
,
598 .dev_uevent
= rfkill_dev_uevent
,
601 static int rfkill_check_duplicity(const struct rfkill
*rfkill
)
604 unsigned long seen
[BITS_TO_LONGS(RFKILL_TYPE_MAX
)];
606 memset(seen
, 0, sizeof(seen
));
608 list_for_each_entry(p
, &rfkill_list
, node
) {
609 if (WARN((p
== rfkill
), KERN_WARNING
610 "rfkill: illegal attempt to register "
611 "an already registered rfkill struct\n"))
613 set_bit(p
->type
, seen
);
616 /* 0: first switch of its kind */
617 return test_bit(rfkill
->type
, seen
);
620 static int rfkill_add_switch(struct rfkill
*rfkill
)
624 mutex_lock(&rfkill_mutex
);
626 error
= rfkill_check_duplicity(rfkill
);
631 /* lock default after first use */
632 set_bit(rfkill
->type
, rfkill_states_lockdflt
);
633 rfkill_global_states
[rfkill
->type
].current_state
=
634 rfkill_global_states
[rfkill
->type
].default_state
;
637 rfkill_toggle_radio(rfkill
,
638 rfkill_global_states
[rfkill
->type
].current_state
,
641 list_add_tail(&rfkill
->node
, &rfkill_list
);
645 mutex_unlock(&rfkill_mutex
);
650 static void rfkill_remove_switch(struct rfkill
*rfkill
)
652 mutex_lock(&rfkill_mutex
);
653 list_del_init(&rfkill
->node
);
654 mutex_unlock(&rfkill_mutex
);
656 mutex_lock(&rfkill
->mutex
);
657 rfkill_toggle_radio(rfkill
, RFKILL_STATE_SOFT_BLOCKED
, 1);
658 mutex_unlock(&rfkill
->mutex
);
662 * rfkill_allocate - allocate memory for rfkill structure.
663 * @parent: device that has rf switch on it
664 * @type: type of the switch (RFKILL_TYPE_*)
666 * This function should be called by the network driver when it needs
667 * rfkill structure. Once the structure is allocated the driver should
668 * finish its initialization by setting the name, private data, enable_radio
669 * and disable_radio methods and then register it with rfkill_register().
671 * NOTE: If registration fails the structure shoudl be freed by calling
672 * rfkill_free() otherwise rfkill_unregister() should be used.
674 struct rfkill
* __must_check
rfkill_allocate(struct device
*parent
,
675 enum rfkill_type type
)
677 struct rfkill
*rfkill
;
680 if (WARN((type
>= RFKILL_TYPE_MAX
),
682 "rfkill: illegal type %d passed as parameter "
683 "to rfkill_allocate\n", type
))
686 rfkill
= kzalloc(sizeof(struct rfkill
), GFP_KERNEL
);
690 mutex_init(&rfkill
->mutex
);
691 INIT_LIST_HEAD(&rfkill
->node
);
695 dev
->class = &rfkill_class
;
696 dev
->parent
= parent
;
697 device_initialize(dev
);
699 __module_get(THIS_MODULE
);
703 EXPORT_SYMBOL(rfkill_allocate
);
706 * rfkill_free - Mark rfkill structure for deletion
707 * @rfkill: rfkill structure to be destroyed
709 * Decrements reference count of the rfkill structure so it is destroyed.
710 * Note that rfkill_free() should _not_ be called after rfkill_unregister().
712 void rfkill_free(struct rfkill
*rfkill
)
715 put_device(&rfkill
->dev
);
717 EXPORT_SYMBOL(rfkill_free
);
719 static void rfkill_led_trigger_register(struct rfkill
*rfkill
)
721 #ifdef CONFIG_RFKILL_LEDS
724 if (!rfkill
->led_trigger
.name
)
725 rfkill
->led_trigger
.name
= rfkill
->dev
.bus_id
;
726 if (!rfkill
->led_trigger
.activate
)
727 rfkill
->led_trigger
.activate
= rfkill_led_trigger_activate
;
728 error
= led_trigger_register(&rfkill
->led_trigger
);
730 rfkill
->led_trigger
.name
= NULL
;
731 #endif /* CONFIG_RFKILL_LEDS */
734 static void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
736 #ifdef CONFIG_RFKILL_LEDS
737 if (rfkill
->led_trigger
.name
) {
738 led_trigger_unregister(&rfkill
->led_trigger
);
739 rfkill
->led_trigger
.name
= NULL
;
745 * rfkill_register - Register a rfkill structure.
746 * @rfkill: rfkill structure to be registered
748 * This function should be called by the network driver when the rfkill
749 * structure needs to be registered. Immediately from registration the
750 * switch driver should be able to service calls to toggle_radio.
752 int __must_check
rfkill_register(struct rfkill
*rfkill
)
754 static atomic_t rfkill_no
= ATOMIC_INIT(0);
755 struct device
*dev
= &rfkill
->dev
;
758 if (WARN((!rfkill
|| !rfkill
->toggle_radio
||
759 rfkill
->type
>= RFKILL_TYPE_MAX
||
760 rfkill
->state
>= RFKILL_STATE_MAX
),
762 "rfkill: attempt to register a "
763 "badly initialized rfkill struct\n"))
766 snprintf(dev
->bus_id
, sizeof(dev
->bus_id
),
767 "rfkill%ld", (long)atomic_inc_return(&rfkill_no
) - 1);
769 rfkill_led_trigger_register(rfkill
);
771 error
= rfkill_add_switch(rfkill
);
773 rfkill_led_trigger_unregister(rfkill
);
777 error
= device_add(dev
);
779 rfkill_remove_switch(rfkill
);
780 rfkill_led_trigger_unregister(rfkill
);
786 EXPORT_SYMBOL(rfkill_register
);
789 * rfkill_unregister - Unregister a rfkill structure.
790 * @rfkill: rfkill structure to be unregistered
792 * This function should be called by the network driver during device
793 * teardown to destroy rfkill structure. Note that rfkill_free() should
794 * _not_ be called after rfkill_unregister().
796 void rfkill_unregister(struct rfkill
*rfkill
)
799 device_del(&rfkill
->dev
);
800 rfkill_remove_switch(rfkill
);
801 rfkill_led_trigger_unregister(rfkill
);
802 put_device(&rfkill
->dev
);
804 EXPORT_SYMBOL(rfkill_unregister
);
807 * rfkill_set_default - set initial value for a switch type
808 * @type - the type of switch to set the default state of
809 * @state - the new default state for that group of switches
811 * Sets the initial state rfkill should use for a given type.
812 * The following initial states are allowed: RFKILL_STATE_SOFT_BLOCKED
813 * and RFKILL_STATE_UNBLOCKED.
815 * This function is meant to be used by platform drivers for platforms
816 * that can save switch state across power down/reboot.
818 * The default state for each switch type can be changed exactly once.
819 * After a switch of that type is registered, the default state cannot
820 * be changed anymore. This guards against multiple drivers it the
821 * same platform trying to set the initial switch default state, which
824 * Returns -EPERM if the state has already been set once or is in use,
825 * so drivers likely want to either ignore or at most printk(KERN_NOTICE)
826 * if this function returns -EPERM.
828 * Returns 0 if the new default state was set, or an error if it
831 int rfkill_set_default(enum rfkill_type type
, enum rfkill_state state
)
835 if (WARN((type
>= RFKILL_TYPE_MAX
||
836 (state
!= RFKILL_STATE_SOFT_BLOCKED
&&
837 state
!= RFKILL_STATE_UNBLOCKED
)),
839 "rfkill: illegal state %d or type %d passed as "
840 "parameter to rfkill_set_default\n", state
, type
))
843 mutex_lock(&rfkill_mutex
);
845 if (!test_and_set_bit(type
, rfkill_states_lockdflt
)) {
846 rfkill_global_states
[type
].default_state
= state
;
851 mutex_unlock(&rfkill_mutex
);
854 EXPORT_SYMBOL_GPL(rfkill_set_default
);
857 * Rfkill module initialization/deinitialization.
859 static int __init
rfkill_init(void)
864 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
865 if (rfkill_default_state
!= RFKILL_STATE_SOFT_BLOCKED
&&
866 rfkill_default_state
!= RFKILL_STATE_UNBLOCKED
)
869 for (i
= 0; i
< RFKILL_TYPE_MAX
; i
++)
870 rfkill_global_states
[i
].default_state
= rfkill_default_state
;
872 error
= class_register(&rfkill_class
);
874 printk(KERN_ERR
"rfkill: unable to register rfkill class\n");
878 register_rfkill_notifier(&rfkill_blocking_uevent_nb
);
883 static void __exit
rfkill_exit(void)
885 unregister_rfkill_notifier(&rfkill_blocking_uevent_nb
);
886 class_unregister(&rfkill_class
);
889 subsys_initcall(rfkill_init
);
890 module_exit(rfkill_exit
);