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 rfkill_led_trigger(rfkill
, rfkill
->state
);
129 blocking_notifier_call_chain(&rfkill_notifier_list
,
130 RFKILL_STATE_CHANGED
,
134 static void update_rfkill_state(struct rfkill
*rfkill
)
136 enum rfkill_state newstate
, oldstate
;
138 if (rfkill
->get_state
) {
139 mutex_lock(&rfkill
->mutex
);
140 if (!rfkill
->get_state(rfkill
->data
, &newstate
)) {
141 oldstate
= rfkill
->state
;
142 rfkill
->state
= newstate
;
143 if (oldstate
!= newstate
)
144 notify_rfkill_state_change(rfkill
);
146 mutex_unlock(&rfkill
->mutex
);
151 * rfkill_toggle_radio - wrapper for toggle_radio hook
152 * @rfkill: the rfkill struct to use
153 * @force: calls toggle_radio even if cache says it is not needed,
154 * and also makes sure notifications of the state will be
155 * sent even if it didn't change
156 * @state: the new state to call toggle_radio() with
158 * Calls rfkill->toggle_radio, enforcing the API for toggle_radio
159 * calls and handling all the red tape such as issuing notifications
160 * if the call is successful.
162 * Suspended devices are not touched at all, and -EAGAIN is returned.
164 * Note that the @force parameter cannot override a (possibly cached)
165 * state of RFKILL_STATE_HARD_BLOCKED. Any device making use of
166 * RFKILL_STATE_HARD_BLOCKED implements either get_state() or
167 * rfkill_force_state(), so the cache either is bypassed or valid.
169 * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
170 * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
171 * give the driver a hint that it should double-BLOCK the transmitter.
173 * Caller must have acquired rfkill->mutex.
175 static int rfkill_toggle_radio(struct rfkill
*rfkill
,
176 enum rfkill_state state
,
180 enum rfkill_state oldstate
, newstate
;
182 if (unlikely(rfkill
->dev
.power
.power_state
.event
& PM_EVENT_SLEEP
))
185 oldstate
= rfkill
->state
;
187 if (rfkill
->get_state
&& !force
&&
188 !rfkill
->get_state(rfkill
->data
, &newstate
))
189 rfkill
->state
= newstate
;
192 case RFKILL_STATE_HARD_BLOCKED
:
193 /* typically happens when refreshing hardware state,
194 * such as on resume */
195 state
= RFKILL_STATE_SOFT_BLOCKED
;
197 case RFKILL_STATE_UNBLOCKED
:
198 /* force can't override this, only rfkill_force_state() can */
199 if (rfkill
->state
== RFKILL_STATE_HARD_BLOCKED
)
202 case RFKILL_STATE_SOFT_BLOCKED
:
203 /* nothing to do, we want to give drivers the hint to double
204 * BLOCK even a transmitter that is already in state
205 * RFKILL_STATE_HARD_BLOCKED */
209 "rfkill: illegal state %d passed as parameter "
210 "to rfkill_toggle_radio\n", state
);
214 if (force
|| state
!= rfkill
->state
) {
215 retval
= rfkill
->toggle_radio(rfkill
->data
, state
);
216 /* never allow a HARD->SOFT downgrade! */
217 if (!retval
&& rfkill
->state
!= RFKILL_STATE_HARD_BLOCKED
)
218 rfkill
->state
= state
;
221 if (force
|| rfkill
->state
!= oldstate
)
222 notify_rfkill_state_change(rfkill
);
228 * __rfkill_switch_all - Toggle state of all switches of given type
229 * @type: type of interfaces to be affected
230 * @state: the new state
232 * This function toggles the state of all switches of given type,
233 * unless a specific switch is claimed by userspace (in which case,
234 * that switch is left alone) or suspended.
236 * Caller must have acquired rfkill_mutex.
238 static void __rfkill_switch_all(const enum rfkill_type type
,
239 const enum rfkill_state state
)
241 struct rfkill
*rfkill
;
243 if (WARN((state
>= RFKILL_STATE_MAX
|| type
>= RFKILL_TYPE_MAX
),
245 "rfkill: illegal state %d or type %d "
246 "passed as parameter to __rfkill_switch_all\n",
250 rfkill_global_states
[type
].current_state
= state
;
251 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
252 if ((!rfkill
->user_claim
) && (rfkill
->type
== type
)) {
253 mutex_lock(&rfkill
->mutex
);
254 rfkill_toggle_radio(rfkill
, state
, 0);
255 mutex_unlock(&rfkill
->mutex
);
261 * rfkill_switch_all - Toggle state of all switches of given type
262 * @type: type of interfaces to be affected
263 * @state: the new state
265 * Acquires rfkill_mutex and calls __rfkill_switch_all(@type, @state).
266 * Please refer to __rfkill_switch_all() for details.
268 void rfkill_switch_all(enum rfkill_type type
, enum rfkill_state state
)
270 mutex_lock(&rfkill_mutex
);
271 __rfkill_switch_all(type
, state
);
272 mutex_unlock(&rfkill_mutex
);
274 EXPORT_SYMBOL(rfkill_switch_all
);
277 * rfkill_epo - emergency power off all transmitters
279 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
280 * ignoring everything in its path but rfkill_mutex and rfkill->mutex.
282 * The global state before the EPO is saved and can be restored later
283 * using rfkill_restore_states().
285 void rfkill_epo(void)
287 struct rfkill
*rfkill
;
290 mutex_lock(&rfkill_mutex
);
291 list_for_each_entry(rfkill
, &rfkill_list
, node
) {
292 mutex_lock(&rfkill
->mutex
);
293 rfkill_toggle_radio(rfkill
, RFKILL_STATE_SOFT_BLOCKED
, 1);
294 mutex_unlock(&rfkill
->mutex
);
296 for (i
= 0; i
< RFKILL_TYPE_MAX
; i
++) {
297 rfkill_global_states
[i
].default_state
=
298 rfkill_global_states
[i
].current_state
;
299 rfkill_global_states
[i
].current_state
=
300 RFKILL_STATE_SOFT_BLOCKED
;
302 mutex_unlock(&rfkill_mutex
);
304 EXPORT_SYMBOL_GPL(rfkill_epo
);
307 * rfkill_restore_states - restore global states
309 * Restore (and sync switches to) the global state from the
310 * states in rfkill_default_states. This can undo the effects of
311 * a call to rfkill_epo().
313 void rfkill_restore_states(void)
317 mutex_lock(&rfkill_mutex
);
318 for (i
= 0; i
< RFKILL_TYPE_MAX
; i
++)
319 __rfkill_switch_all(i
, rfkill_global_states
[i
].default_state
);
320 mutex_unlock(&rfkill_mutex
);
322 EXPORT_SYMBOL_GPL(rfkill_restore_states
);
325 * rfkill_force_state - Force the internal rfkill radio state
326 * @rfkill: pointer to the rfkill class to modify.
327 * @state: the current radio state the class should be forced to.
329 * This function updates the internal state of the radio cached
330 * by the rfkill class. It should be used when the driver gets
331 * a notification by the firmware/hardware of the current *real*
332 * state of the radio rfkill switch.
334 * Devices which are subject to external changes on their rfkill
335 * state (such as those caused by a hardware rfkill line) MUST
336 * have their driver arrange to call rfkill_force_state() as soon
337 * as possible after such a change.
339 * This function may not be called from an atomic context.
341 int rfkill_force_state(struct rfkill
*rfkill
, enum rfkill_state state
)
343 enum rfkill_state oldstate
;
346 if (WARN((state
>= RFKILL_STATE_MAX
),
348 "rfkill: illegal state %d passed as parameter "
349 "to rfkill_force_state\n", state
))
352 mutex_lock(&rfkill
->mutex
);
354 oldstate
= rfkill
->state
;
355 rfkill
->state
= state
;
357 if (state
!= oldstate
)
358 notify_rfkill_state_change(rfkill
);
360 mutex_unlock(&rfkill
->mutex
);
364 EXPORT_SYMBOL(rfkill_force_state
);
366 static ssize_t
rfkill_name_show(struct device
*dev
,
367 struct device_attribute
*attr
,
370 struct rfkill
*rfkill
= to_rfkill(dev
);
372 return sprintf(buf
, "%s\n", rfkill
->name
);
375 static const char *rfkill_get_type_str(enum rfkill_type type
)
378 case RFKILL_TYPE_WLAN
:
380 case RFKILL_TYPE_BLUETOOTH
:
382 case RFKILL_TYPE_UWB
:
383 return "ultrawideband";
384 case RFKILL_TYPE_WIMAX
:
386 case RFKILL_TYPE_WWAN
:
393 static ssize_t
rfkill_type_show(struct device
*dev
,
394 struct device_attribute
*attr
,
397 struct rfkill
*rfkill
= to_rfkill(dev
);
399 return sprintf(buf
, "%s\n", rfkill_get_type_str(rfkill
->type
));
402 static ssize_t
rfkill_state_show(struct device
*dev
,
403 struct device_attribute
*attr
,
406 struct rfkill
*rfkill
= to_rfkill(dev
);
408 update_rfkill_state(rfkill
);
409 return sprintf(buf
, "%d\n", rfkill
->state
);
412 static ssize_t
rfkill_state_store(struct device
*dev
,
413 struct device_attribute
*attr
,
414 const char *buf
, size_t count
)
416 struct rfkill
*rfkill
= to_rfkill(dev
);
420 if (!capable(CAP_NET_ADMIN
))
423 error
= strict_strtoul(buf
, 0, &state
);
427 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
428 if (state
!= RFKILL_STATE_UNBLOCKED
&&
429 state
!= RFKILL_STATE_SOFT_BLOCKED
)
432 if (mutex_lock_interruptible(&rfkill
->mutex
))
434 error
= rfkill_toggle_radio(rfkill
, state
, 0);
435 mutex_unlock(&rfkill
->mutex
);
437 return error
? error
: count
;
440 static ssize_t
rfkill_claim_show(struct device
*dev
,
441 struct device_attribute
*attr
,
444 struct rfkill
*rfkill
= to_rfkill(dev
);
446 return sprintf(buf
, "%d\n", rfkill
->user_claim
);
449 static ssize_t
rfkill_claim_store(struct device
*dev
,
450 struct device_attribute
*attr
,
451 const char *buf
, size_t count
)
453 struct rfkill
*rfkill
= to_rfkill(dev
);
454 unsigned long claim_tmp
;
458 if (!capable(CAP_NET_ADMIN
))
461 if (rfkill
->user_claim_unsupported
)
464 error
= strict_strtoul(buf
, 0, &claim_tmp
);
470 * Take the global lock to make sure the kernel is not in
471 * the middle of rfkill_switch_all
473 error
= mutex_lock_interruptible(&rfkill_mutex
);
477 if (rfkill
->user_claim
!= claim
) {
479 mutex_lock(&rfkill
->mutex
);
480 rfkill_toggle_radio(rfkill
,
481 rfkill_global_states
[rfkill
->type
].current_state
,
483 mutex_unlock(&rfkill
->mutex
);
485 rfkill
->user_claim
= claim
;
488 mutex_unlock(&rfkill_mutex
);
490 return error
? error
: count
;
493 static struct device_attribute rfkill_dev_attrs
[] = {
494 __ATTR(name
, S_IRUGO
, rfkill_name_show
, NULL
),
495 __ATTR(type
, S_IRUGO
, rfkill_type_show
, NULL
),
496 __ATTR(state
, S_IRUGO
|S_IWUSR
, rfkill_state_show
, rfkill_state_store
),
497 __ATTR(claim
, S_IRUGO
|S_IWUSR
, rfkill_claim_show
, rfkill_claim_store
),
501 static void rfkill_release(struct device
*dev
)
503 struct rfkill
*rfkill
= to_rfkill(dev
);
506 module_put(THIS_MODULE
);
510 static int rfkill_suspend(struct device
*dev
, pm_message_t state
)
512 struct rfkill
*rfkill
= to_rfkill(dev
);
514 if (dev
->power
.power_state
.event
!= state
.event
) {
515 if (state
.event
& PM_EVENT_SLEEP
) {
516 /* Stop transmitter, keep state, no notifies */
517 update_rfkill_state(rfkill
);
519 mutex_lock(&rfkill
->mutex
);
520 rfkill
->toggle_radio(rfkill
->data
,
521 RFKILL_STATE_SOFT_BLOCKED
);
522 mutex_unlock(&rfkill
->mutex
);
525 dev
->power
.power_state
= state
;
531 static int rfkill_resume(struct device
*dev
)
533 struct rfkill
*rfkill
= to_rfkill(dev
);
535 if (dev
->power
.power_state
.event
!= PM_EVENT_ON
) {
536 mutex_lock(&rfkill
->mutex
);
538 dev
->power
.power_state
.event
= PM_EVENT_ON
;
540 /* restore radio state AND notify everybody */
541 rfkill_toggle_radio(rfkill
, rfkill
->state
, 1);
543 mutex_unlock(&rfkill
->mutex
);
549 #define rfkill_suspend NULL
550 #define rfkill_resume NULL
553 static int rfkill_blocking_uevent_notifier(struct notifier_block
*nb
,
554 unsigned long eventid
,
557 struct rfkill
*rfkill
= (struct rfkill
*)data
;
560 case RFKILL_STATE_CHANGED
:
561 kobject_uevent(&rfkill
->dev
.kobj
, KOBJ_CHANGE
);
570 static struct notifier_block rfkill_blocking_uevent_nb
= {
571 .notifier_call
= rfkill_blocking_uevent_notifier
,
575 static int rfkill_dev_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
577 struct rfkill
*rfkill
= to_rfkill(dev
);
580 error
= add_uevent_var(env
, "RFKILL_NAME=%s", rfkill
->name
);
583 error
= add_uevent_var(env
, "RFKILL_TYPE=%s",
584 rfkill_get_type_str(rfkill
->type
));
587 error
= add_uevent_var(env
, "RFKILL_STATE=%d", rfkill
->state
);
591 static struct class rfkill_class
= {
593 .dev_release
= rfkill_release
,
594 .dev_attrs
= rfkill_dev_attrs
,
595 .suspend
= rfkill_suspend
,
596 .resume
= rfkill_resume
,
597 .dev_uevent
= rfkill_dev_uevent
,
600 static int rfkill_check_duplicity(const struct rfkill
*rfkill
)
603 unsigned long seen
[BITS_TO_LONGS(RFKILL_TYPE_MAX
)];
605 memset(seen
, 0, sizeof(seen
));
607 list_for_each_entry(p
, &rfkill_list
, node
) {
608 if (WARN((p
== rfkill
), KERN_WARNING
609 "rfkill: illegal attempt to register "
610 "an already registered rfkill struct\n"))
612 set_bit(p
->type
, seen
);
615 /* 0: first switch of its kind */
616 return test_bit(rfkill
->type
, seen
);
619 static int rfkill_add_switch(struct rfkill
*rfkill
)
623 mutex_lock(&rfkill_mutex
);
625 error
= rfkill_check_duplicity(rfkill
);
630 /* lock default after first use */
631 set_bit(rfkill
->type
, rfkill_states_lockdflt
);
632 rfkill_global_states
[rfkill
->type
].current_state
=
633 rfkill_global_states
[rfkill
->type
].default_state
;
636 rfkill_toggle_radio(rfkill
,
637 rfkill_global_states
[rfkill
->type
].current_state
,
640 list_add_tail(&rfkill
->node
, &rfkill_list
);
644 mutex_unlock(&rfkill_mutex
);
649 static void rfkill_remove_switch(struct rfkill
*rfkill
)
651 mutex_lock(&rfkill_mutex
);
652 list_del_init(&rfkill
->node
);
653 mutex_unlock(&rfkill_mutex
);
655 mutex_lock(&rfkill
->mutex
);
656 rfkill_toggle_radio(rfkill
, RFKILL_STATE_SOFT_BLOCKED
, 1);
657 mutex_unlock(&rfkill
->mutex
);
661 * rfkill_allocate - allocate memory for rfkill structure.
662 * @parent: device that has rf switch on it
663 * @type: type of the switch (RFKILL_TYPE_*)
665 * This function should be called by the network driver when it needs
666 * rfkill structure. Once the structure is allocated the driver should
667 * finish its initialization by setting the name, private data, enable_radio
668 * and disable_radio methods and then register it with rfkill_register().
670 * NOTE: If registration fails the structure shoudl be freed by calling
671 * rfkill_free() otherwise rfkill_unregister() should be used.
673 struct rfkill
* __must_check
rfkill_allocate(struct device
*parent
,
674 enum rfkill_type type
)
676 struct rfkill
*rfkill
;
679 if (WARN((type
>= RFKILL_TYPE_MAX
),
681 "rfkill: illegal type %d passed as parameter "
682 "to rfkill_allocate\n", type
))
685 rfkill
= kzalloc(sizeof(struct rfkill
), GFP_KERNEL
);
689 mutex_init(&rfkill
->mutex
);
690 INIT_LIST_HEAD(&rfkill
->node
);
694 dev
->class = &rfkill_class
;
695 dev
->parent
= parent
;
696 device_initialize(dev
);
698 __module_get(THIS_MODULE
);
702 EXPORT_SYMBOL(rfkill_allocate
);
705 * rfkill_free - Mark rfkill structure for deletion
706 * @rfkill: rfkill structure to be destroyed
708 * Decrements reference count of the rfkill structure so it is destroyed.
709 * Note that rfkill_free() should _not_ be called after rfkill_unregister().
711 void rfkill_free(struct rfkill
*rfkill
)
714 put_device(&rfkill
->dev
);
716 EXPORT_SYMBOL(rfkill_free
);
718 static void rfkill_led_trigger_register(struct rfkill
*rfkill
)
720 #ifdef CONFIG_RFKILL_LEDS
723 if (!rfkill
->led_trigger
.name
)
724 rfkill
->led_trigger
.name
= rfkill
->dev
.bus_id
;
725 if (!rfkill
->led_trigger
.activate
)
726 rfkill
->led_trigger
.activate
= rfkill_led_trigger_activate
;
727 error
= led_trigger_register(&rfkill
->led_trigger
);
729 rfkill
->led_trigger
.name
= NULL
;
730 #endif /* CONFIG_RFKILL_LEDS */
733 static void rfkill_led_trigger_unregister(struct rfkill
*rfkill
)
735 #ifdef CONFIG_RFKILL_LEDS
736 if (rfkill
->led_trigger
.name
) {
737 led_trigger_unregister(&rfkill
->led_trigger
);
738 rfkill
->led_trigger
.name
= NULL
;
744 * rfkill_register - Register a rfkill structure.
745 * @rfkill: rfkill structure to be registered
747 * This function should be called by the network driver when the rfkill
748 * structure needs to be registered. Immediately from registration the
749 * switch driver should be able to service calls to toggle_radio.
751 int __must_check
rfkill_register(struct rfkill
*rfkill
)
753 static atomic_t rfkill_no
= ATOMIC_INIT(0);
754 struct device
*dev
= &rfkill
->dev
;
757 if (WARN((!rfkill
|| !rfkill
->toggle_radio
||
758 rfkill
->type
>= RFKILL_TYPE_MAX
||
759 rfkill
->state
>= RFKILL_STATE_MAX
),
761 "rfkill: attempt to register a "
762 "badly initialized rfkill struct\n"))
765 snprintf(dev
->bus_id
, sizeof(dev
->bus_id
),
766 "rfkill%ld", (long)atomic_inc_return(&rfkill_no
) - 1);
768 rfkill_led_trigger_register(rfkill
);
770 error
= rfkill_add_switch(rfkill
);
772 rfkill_led_trigger_unregister(rfkill
);
776 error
= device_add(dev
);
778 rfkill_remove_switch(rfkill
);
779 rfkill_led_trigger_unregister(rfkill
);
785 EXPORT_SYMBOL(rfkill_register
);
788 * rfkill_unregister - Unregister a rfkill structure.
789 * @rfkill: rfkill structure to be unregistered
791 * This function should be called by the network driver during device
792 * teardown to destroy rfkill structure. Note that rfkill_free() should
793 * _not_ be called after rfkill_unregister().
795 void rfkill_unregister(struct rfkill
*rfkill
)
798 device_del(&rfkill
->dev
);
799 rfkill_remove_switch(rfkill
);
800 rfkill_led_trigger_unregister(rfkill
);
801 put_device(&rfkill
->dev
);
803 EXPORT_SYMBOL(rfkill_unregister
);
806 * rfkill_set_default - set initial value for a switch type
807 * @type - the type of switch to set the default state of
808 * @state - the new default state for that group of switches
810 * Sets the initial state rfkill should use for a given type.
811 * The following initial states are allowed: RFKILL_STATE_SOFT_BLOCKED
812 * and RFKILL_STATE_UNBLOCKED.
814 * This function is meant to be used by platform drivers for platforms
815 * that can save switch state across power down/reboot.
817 * The default state for each switch type can be changed exactly once.
818 * After a switch of that type is registered, the default state cannot
819 * be changed anymore. This guards against multiple drivers it the
820 * same platform trying to set the initial switch default state, which
823 * Returns -EPERM if the state has already been set once or is in use,
824 * so drivers likely want to either ignore or at most printk(KERN_NOTICE)
825 * if this function returns -EPERM.
827 * Returns 0 if the new default state was set, or an error if it
830 int rfkill_set_default(enum rfkill_type type
, enum rfkill_state state
)
834 if (WARN((type
>= RFKILL_TYPE_MAX
||
835 (state
!= RFKILL_STATE_SOFT_BLOCKED
&&
836 state
!= RFKILL_STATE_UNBLOCKED
)),
838 "rfkill: illegal state %d or type %d passed as "
839 "parameter to rfkill_set_default\n", state
, type
))
842 mutex_lock(&rfkill_mutex
);
844 if (!test_and_set_bit(type
, rfkill_states_lockdflt
)) {
845 rfkill_global_states
[type
].default_state
= state
;
850 mutex_unlock(&rfkill_mutex
);
853 EXPORT_SYMBOL_GPL(rfkill_set_default
);
856 * Rfkill module initialization/deinitialization.
858 static int __init
rfkill_init(void)
863 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
864 if (rfkill_default_state
!= RFKILL_STATE_SOFT_BLOCKED
&&
865 rfkill_default_state
!= RFKILL_STATE_UNBLOCKED
)
868 for (i
= 0; i
< RFKILL_TYPE_MAX
; i
++)
869 rfkill_global_states
[i
].default_state
= rfkill_default_state
;
871 error
= class_register(&rfkill_class
);
873 printk(KERN_ERR
"rfkill: unable to register rfkill class\n");
877 register_rfkill_notifier(&rfkill_blocking_uevent_nb
);
882 static void __exit
rfkill_exit(void)
884 unregister_rfkill_notifier(&rfkill_blocking_uevent_nb
);
885 class_unregister(&rfkill_class
);
888 subsys_initcall(rfkill_init
);
889 module_exit(rfkill_exit
);