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_global_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)];
54 static bool rfkill_epo_lock_active;
57 #ifdef CONFIG_RFKILL_LEDS
58 static void rfkill_led_trigger(struct rfkill *rfkill,
59 enum rfkill_state state)
61 struct led_trigger *led = &rfkill->led_trigger;
65 if (state != RFKILL_STATE_UNBLOCKED)
66 led_trigger_event(led, LED_OFF);
68 led_trigger_event(led, LED_FULL);
71 static void rfkill_led_trigger_activate(struct led_classdev *led)
73 struct rfkill *rfkill = container_of(led->trigger,
74 struct rfkill, led_trigger);
76 rfkill_led_trigger(rfkill, rfkill->state);
78 #endif /* CONFIG_RFKILL_LEDS */
80 static void rfkill_uevent(struct rfkill *rfkill)
82 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
85 static void update_rfkill_state(struct rfkill *rfkill)
87 enum rfkill_state newstate, oldstate;
89 if (rfkill->get_state) {
90 mutex_lock(&rfkill->mutex);
91 if (!rfkill->get_state(rfkill->data, &newstate)) {
92 oldstate = rfkill->state;
93 rfkill->state = newstate;
94 if (oldstate != newstate)
95 rfkill_uevent(rfkill);
97 mutex_unlock(&rfkill->mutex);
102 * rfkill_toggle_radio - wrapper for toggle_radio hook
103 * @rfkill: the rfkill struct to use
104 * @force: calls toggle_radio even if cache says it is not needed,
105 * and also makes sure notifications of the state will be
106 * sent even if it didn't change
107 * @state: the new state to call toggle_radio() with
109 * Calls rfkill->toggle_radio, enforcing the API for toggle_radio
110 * calls and handling all the red tape such as issuing notifications
111 * if the call is successful.
113 * Suspended devices are not touched at all, and -EAGAIN is returned.
115 * Note that the @force parameter cannot override a (possibly cached)
116 * state of RFKILL_STATE_HARD_BLOCKED. Any device making use of
117 * RFKILL_STATE_HARD_BLOCKED implements either get_state() or
118 * rfkill_force_state(), so the cache either is bypassed or valid.
120 * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
121 * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
122 * give the driver a hint that it should double-BLOCK the transmitter.
124 * Caller must have acquired rfkill->mutex.
126 static int rfkill_toggle_radio(struct rfkill *rfkill,
127 enum rfkill_state state,
131 enum rfkill_state oldstate, newstate;
133 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
136 oldstate = rfkill->state;
138 if (rfkill->get_state && !force &&
139 !rfkill->get_state(rfkill->data, &newstate))
140 rfkill->state = newstate;
143 case RFKILL_STATE_HARD_BLOCKED:
144 /* typically happens when refreshing hardware state,
145 * such as on resume */
146 state = RFKILL_STATE_SOFT_BLOCKED;
148 case RFKILL_STATE_UNBLOCKED:
149 /* force can't override this, only rfkill_force_state() can */
150 if (rfkill->state == RFKILL_STATE_HARD_BLOCKED)
153 case RFKILL_STATE_SOFT_BLOCKED:
154 /* nothing to do, we want to give drivers the hint to double
155 * BLOCK even a transmitter that is already in state
156 * RFKILL_STATE_HARD_BLOCKED */
160 "rfkill: illegal state %d passed as parameter "
161 "to rfkill_toggle_radio\n", state);
165 if (force || state != rfkill->state) {
166 retval = rfkill->toggle_radio(rfkill->data, state);
167 /* never allow a HARD->SOFT downgrade! */
168 if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED)
169 rfkill->state = state;
172 if (force || rfkill->state != oldstate)
173 rfkill_uevent(rfkill);
179 * __rfkill_switch_all - Toggle state of all switches of given type
180 * @type: type of interfaces to be affected
181 * @state: the new state
183 * This function toggles the state of all switches of given type,
184 * unless a specific switch is claimed by userspace (in which case,
185 * that switch is left alone) or suspended.
187 * Caller must have acquired rfkill_global_mutex.
189 static void __rfkill_switch_all(const enum rfkill_type type,
190 const enum rfkill_state state)
192 struct rfkill *rfkill;
194 if (WARN((state >= RFKILL_STATE_MAX || type >= RFKILL_TYPE_MAX),
196 "rfkill: illegal state %d or type %d "
197 "passed as parameter to __rfkill_switch_all\n",
201 rfkill_global_states[type].current_state = state;
202 list_for_each_entry(rfkill, &rfkill_list, node) {
203 if (rfkill->type == type) {
204 mutex_lock(&rfkill->mutex);
205 rfkill_toggle_radio(rfkill, state, 0);
206 mutex_unlock(&rfkill->mutex);
212 * rfkill_switch_all - Toggle state of all switches of given type
213 * @type: type of interfaces to be affected
214 * @state: the new state
216 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
217 * Please refer to __rfkill_switch_all() for details.
219 * Does nothing if the EPO lock is active.
221 void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
223 mutex_lock(&rfkill_global_mutex);
224 if (!rfkill_epo_lock_active)
225 __rfkill_switch_all(type, state);
226 mutex_unlock(&rfkill_global_mutex);
228 EXPORT_SYMBOL(rfkill_switch_all);
231 * rfkill_epo - emergency power off all transmitters
233 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
234 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
236 * The global state before the EPO is saved and can be restored later
237 * using rfkill_restore_states().
239 void rfkill_epo(void)
241 struct rfkill *rfkill;
244 mutex_lock(&rfkill_global_mutex);
246 rfkill_epo_lock_active = true;
247 list_for_each_entry(rfkill, &rfkill_list, node) {
248 mutex_lock(&rfkill->mutex);
249 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
250 mutex_unlock(&rfkill->mutex);
252 for (i = 0; i < RFKILL_TYPE_MAX; i++) {
253 rfkill_global_states[i].default_state =
254 rfkill_global_states[i].current_state;
255 rfkill_global_states[i].current_state =
256 RFKILL_STATE_SOFT_BLOCKED;
258 mutex_unlock(&rfkill_global_mutex);
260 EXPORT_SYMBOL_GPL(rfkill_epo);
263 * rfkill_restore_states - restore global states
265 * Restore (and sync switches to) the global state from the
266 * states in rfkill_default_states. This can undo the effects of
267 * a call to rfkill_epo().
269 void rfkill_restore_states(void)
273 mutex_lock(&rfkill_global_mutex);
275 rfkill_epo_lock_active = false;
276 for (i = 0; i < RFKILL_TYPE_MAX; i++)
277 __rfkill_switch_all(i, rfkill_global_states[i].default_state);
278 mutex_unlock(&rfkill_global_mutex);
280 EXPORT_SYMBOL_GPL(rfkill_restore_states);
283 * rfkill_remove_epo_lock - unlock state changes
285 * Used by rfkill-input manually unlock state changes, when
286 * the EPO switch is deactivated.
288 void rfkill_remove_epo_lock(void)
290 mutex_lock(&rfkill_global_mutex);
291 rfkill_epo_lock_active = false;
292 mutex_unlock(&rfkill_global_mutex);
294 EXPORT_SYMBOL_GPL(rfkill_remove_epo_lock);
297 * rfkill_is_epo_lock_active - returns true EPO is active
299 * Returns 0 (false) if there is NOT an active EPO contidion,
300 * and 1 (true) if there is an active EPO contition, which
301 * locks all radios in one of the BLOCKED states.
303 * Can be called in atomic context.
305 bool rfkill_is_epo_lock_active(void)
307 return rfkill_epo_lock_active;
309 EXPORT_SYMBOL_GPL(rfkill_is_epo_lock_active);
312 * rfkill_get_global_state - returns global state for a type
313 * @type: the type to get the global state of
315 * Returns the current global state for a given wireless
318 enum rfkill_state rfkill_get_global_state(const enum rfkill_type type)
320 return rfkill_global_states[type].current_state;
322 EXPORT_SYMBOL_GPL(rfkill_get_global_state);
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 rfkill_uevent(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 error = mutex_lock_killable(&rfkill->mutex);
436 if (!rfkill_epo_lock_active)
437 error = rfkill_toggle_radio(rfkill, state, 0);
441 mutex_unlock(&rfkill->mutex);
443 return error ? error : count;
446 static ssize_t rfkill_claim_show(struct device *dev,
447 struct device_attribute *attr,
450 return sprintf(buf, "%d\n", 0);
453 static ssize_t rfkill_claim_store(struct device *dev,
454 struct device_attribute *attr,
455 const char *buf, size_t count)
460 static struct device_attribute rfkill_dev_attrs[] = {
461 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
462 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
463 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
464 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
468 static void rfkill_release(struct device *dev)
470 struct rfkill *rfkill = to_rfkill(dev);
473 module_put(THIS_MODULE);
477 static int rfkill_suspend(struct device *dev, pm_message_t state)
479 struct rfkill *rfkill = to_rfkill(dev);
481 /* mark class device as suspended */
482 if (dev->power.power_state.event != state.event)
483 dev->power.power_state = state;
485 /* store state for the resume handler */
486 rfkill->state_for_resume = rfkill->state;
491 static int rfkill_resume(struct device *dev)
493 struct rfkill *rfkill = to_rfkill(dev);
494 enum rfkill_state newstate;
496 if (dev->power.power_state.event != PM_EVENT_ON) {
497 mutex_lock(&rfkill->mutex);
499 dev->power.power_state.event = PM_EVENT_ON;
502 * rfkill->state could have been modified before we got
503 * called, and won't be updated by rfkill_toggle_radio()
504 * in force mode. Sync it FIRST.
506 if (rfkill->get_state &&
507 !rfkill->get_state(rfkill->data, &newstate))
508 rfkill->state = newstate;
511 * If we are under EPO, kick transmitter offline,
512 * otherwise restore to pre-suspend state.
514 * Issue a notification in any case
516 rfkill_toggle_radio(rfkill,
517 rfkill_epo_lock_active ?
518 RFKILL_STATE_SOFT_BLOCKED :
519 rfkill->state_for_resume,
522 mutex_unlock(&rfkill->mutex);
528 #define rfkill_suspend NULL
529 #define rfkill_resume NULL
532 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
534 struct rfkill *rfkill = to_rfkill(dev);
537 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
540 error = add_uevent_var(env, "RFKILL_TYPE=%s",
541 rfkill_get_type_str(rfkill->type));
544 error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state);
548 static struct class rfkill_class = {
550 .dev_release = rfkill_release,
551 .dev_attrs = rfkill_dev_attrs,
552 .suspend = rfkill_suspend,
553 .resume = rfkill_resume,
554 .dev_uevent = rfkill_dev_uevent,
557 static int rfkill_check_duplicity(const struct rfkill *rfkill)
560 unsigned long seen[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
562 memset(seen, 0, sizeof(seen));
564 list_for_each_entry(p, &rfkill_list, node) {
565 if (WARN((p == rfkill), KERN_WARNING
566 "rfkill: illegal attempt to register "
567 "an already registered rfkill struct\n"))
569 set_bit(p->type, seen);
572 /* 0: first switch of its kind */
573 return (test_bit(rfkill->type, seen)) ? 1 : 0;
576 static int rfkill_add_switch(struct rfkill *rfkill)
580 mutex_lock(&rfkill_global_mutex);
582 error = rfkill_check_duplicity(rfkill);
587 /* lock default after first use */
588 set_bit(rfkill->type, rfkill_states_lockdflt);
589 rfkill_global_states[rfkill->type].current_state =
590 rfkill_global_states[rfkill->type].default_state;
593 rfkill_toggle_radio(rfkill,
594 rfkill_global_states[rfkill->type].current_state,
597 list_add_tail(&rfkill->node, &rfkill_list);
601 mutex_unlock(&rfkill_global_mutex);
606 static void rfkill_remove_switch(struct rfkill *rfkill)
608 mutex_lock(&rfkill_global_mutex);
609 list_del_init(&rfkill->node);
610 mutex_unlock(&rfkill_global_mutex);
612 mutex_lock(&rfkill->mutex);
613 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
614 mutex_unlock(&rfkill->mutex);
618 * rfkill_allocate - allocate memory for rfkill structure.
619 * @parent: device that has rf switch on it
620 * @type: type of the switch (RFKILL_TYPE_*)
622 * This function should be called by the network driver when it needs
623 * rfkill structure. Once the structure is allocated the driver should
624 * finish its initialization by setting the name, private data, enable_radio
625 * and disable_radio methods and then register it with rfkill_register().
627 * NOTE: If registration fails the structure shoudl be freed by calling
628 * rfkill_free() otherwise rfkill_unregister() should be used.
630 struct rfkill * __must_check rfkill_allocate(struct device *parent,
631 enum rfkill_type type)
633 struct rfkill *rfkill;
636 if (WARN((type >= RFKILL_TYPE_MAX),
638 "rfkill: illegal type %d passed as parameter "
639 "to rfkill_allocate\n", type))
642 rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
646 mutex_init(&rfkill->mutex);
647 INIT_LIST_HEAD(&rfkill->node);
651 dev->class = &rfkill_class;
652 dev->parent = parent;
653 device_initialize(dev);
655 __module_get(THIS_MODULE);
659 EXPORT_SYMBOL(rfkill_allocate);
662 * rfkill_free - Mark rfkill structure for deletion
663 * @rfkill: rfkill structure to be destroyed
665 * Decrements reference count of the rfkill structure so it is destroyed.
666 * Note that rfkill_free() should _not_ be called after rfkill_unregister().
668 void rfkill_free(struct rfkill *rfkill)
671 put_device(&rfkill->dev);
673 EXPORT_SYMBOL(rfkill_free);
675 static void rfkill_led_trigger_register(struct rfkill *rfkill)
677 #ifdef CONFIG_RFKILL_LEDS
680 if (!rfkill->led_trigger.name)
681 rfkill->led_trigger.name = dev_name(&rfkill->dev);
682 if (!rfkill->led_trigger.activate)
683 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
684 error = led_trigger_register(&rfkill->led_trigger);
686 rfkill->led_trigger.name = NULL;
687 #endif /* CONFIG_RFKILL_LEDS */
690 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
692 #ifdef CONFIG_RFKILL_LEDS
693 if (rfkill->led_trigger.name) {
694 led_trigger_unregister(&rfkill->led_trigger);
695 rfkill->led_trigger.name = NULL;
701 * rfkill_register - Register a rfkill structure.
702 * @rfkill: rfkill structure to be registered
704 * This function should be called by the network driver when the rfkill
705 * structure needs to be registered. Immediately from registration the
706 * switch driver should be able to service calls to toggle_radio.
708 int __must_check rfkill_register(struct rfkill *rfkill)
710 static atomic_t rfkill_no = ATOMIC_INIT(0);
711 struct device *dev = &rfkill->dev;
714 if (WARN((!rfkill || !rfkill->toggle_radio ||
715 rfkill->type >= RFKILL_TYPE_MAX ||
716 rfkill->state >= RFKILL_STATE_MAX),
718 "rfkill: attempt to register a "
719 "badly initialized rfkill struct\n"))
722 dev_set_name(dev, "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
724 rfkill_led_trigger_register(rfkill);
726 error = rfkill_add_switch(rfkill);
728 rfkill_led_trigger_unregister(rfkill);
732 error = device_add(dev);
734 rfkill_remove_switch(rfkill);
735 rfkill_led_trigger_unregister(rfkill);
741 EXPORT_SYMBOL(rfkill_register);
744 * rfkill_unregister - Unregister a rfkill structure.
745 * @rfkill: rfkill structure to be unregistered
747 * This function should be called by the network driver during device
748 * teardown to destroy rfkill structure. Note that rfkill_free() should
749 * _not_ be called after rfkill_unregister().
751 void rfkill_unregister(struct rfkill *rfkill)
754 device_del(&rfkill->dev);
755 rfkill_remove_switch(rfkill);
756 rfkill_led_trigger_unregister(rfkill);
757 put_device(&rfkill->dev);
759 EXPORT_SYMBOL(rfkill_unregister);
762 * rfkill_set_default - set initial value for a switch type
763 * @type - the type of switch to set the default state of
764 * @state - the new default state for that group of switches
766 * Sets the initial state rfkill should use for a given type.
767 * The following initial states are allowed: RFKILL_STATE_SOFT_BLOCKED
768 * and RFKILL_STATE_UNBLOCKED.
770 * This function is meant to be used by platform drivers for platforms
771 * that can save switch state across power down/reboot.
773 * The default state for each switch type can be changed exactly once.
774 * After a switch of that type is registered, the default state cannot
775 * be changed anymore. This guards against multiple drivers it the
776 * same platform trying to set the initial switch default state, which
779 * Returns -EPERM if the state has already been set once or is in use,
780 * so drivers likely want to either ignore or at most printk(KERN_NOTICE)
781 * if this function returns -EPERM.
783 * Returns 0 if the new default state was set, or an error if it
786 int rfkill_set_default(enum rfkill_type type, enum rfkill_state state)
790 if (WARN((type >= RFKILL_TYPE_MAX ||
791 (state != RFKILL_STATE_SOFT_BLOCKED &&
792 state != RFKILL_STATE_UNBLOCKED)),
794 "rfkill: illegal state %d or type %d passed as "
795 "parameter to rfkill_set_default\n", state, type))
798 mutex_lock(&rfkill_global_mutex);
800 if (!test_and_set_bit(type, rfkill_states_lockdflt)) {
801 rfkill_global_states[type].default_state = state;
802 rfkill_global_states[type].current_state = state;
807 mutex_unlock(&rfkill_global_mutex);
810 EXPORT_SYMBOL_GPL(rfkill_set_default);
813 * Rfkill module initialization/deinitialization.
815 static int __init rfkill_init(void)
820 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
821 if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED &&
822 rfkill_default_state != RFKILL_STATE_UNBLOCKED)
825 for (i = 0; i < RFKILL_TYPE_MAX; i++)
826 rfkill_global_states[i].default_state = rfkill_default_state;
828 error = class_register(&rfkill_class);
830 printk(KERN_ERR "rfkill: unable to register rfkill class\n");
837 static void __exit rfkill_exit(void)
839 class_unregister(&rfkill_class);
842 subsys_initcall(rfkill_init);
843 module_exit(rfkill_exit);