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-rw-r--r--net/rfkill/rfkill.c882
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diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
deleted file mode 100644
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--- a/net/rfkill/rfkill.c
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1/*
2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
4 *
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.
9 *
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.
14 *
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.
19 */
20
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>
29
30/* Get declaration of rfkill_switch_all() to shut up sparse. */
31#include "rfkill-input.h"
32
33
34MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
35MODULE_VERSION("1.0");
36MODULE_DESCRIPTION("RF switch support");
37MODULE_LICENSE("GPL");
38
39static LIST_HEAD(rfkill_list); /* list of registered rf switches */
40static DEFINE_MUTEX(rfkill_global_mutex);
41
42static unsigned int rfkill_default_state = RFKILL_STATE_UNBLOCKED;
43module_param_named(default_state, rfkill_default_state, uint, 0444);
44MODULE_PARM_DESC(default_state,
45 "Default initial state for all radio types, 0 = radio off");
46
47struct rfkill_gsw_state {
48 enum rfkill_state current_state;
49 enum rfkill_state default_state;
50};
51
52static struct rfkill_gsw_state rfkill_global_states[RFKILL_TYPE_MAX];
53static unsigned long rfkill_states_lockdflt[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
54static bool rfkill_epo_lock_active;
55
56
57#ifdef CONFIG_RFKILL_LEDS
58static void rfkill_led_trigger(struct rfkill *rfkill,
59 enum rfkill_state state)
60{
61 struct led_trigger *led = &rfkill->led_trigger;
62
63 if (!led->name)
64 return;
65 if (state != RFKILL_STATE_UNBLOCKED)
66 led_trigger_event(led, LED_OFF);
67 else
68 led_trigger_event(led, LED_FULL);
69}
70
71static void rfkill_led_trigger_activate(struct led_classdev *led)
72{
73 struct rfkill *rfkill = container_of(led->trigger,
74 struct rfkill, led_trigger);
75
76 rfkill_led_trigger(rfkill, rfkill->state);
77}
78#endif /* CONFIG_RFKILL_LEDS */
79
80static void rfkill_uevent(struct rfkill *rfkill)
81{
82 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
83}
84
85static void update_rfkill_state(struct rfkill *rfkill)
86{
87 enum rfkill_state newstate, oldstate;
88
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);
96 }
97 mutex_unlock(&rfkill->mutex);
98 }
99}
100
101/**
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
108 *
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.
112 *
113 * Suspended devices are not touched at all, and -EAGAIN is returned.
114 *
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.
119 *
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.
123 *
124 * Caller must have acquired rfkill->mutex.
125 */
126static int rfkill_toggle_radio(struct rfkill *rfkill,
127 enum rfkill_state state,
128 int force)
129{
130 int retval = 0;
131 enum rfkill_state oldstate, newstate;
132
133 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
134 return -EBUSY;
135
136 oldstate = rfkill->state;
137
138 if (rfkill->get_state && !force &&
139 !rfkill->get_state(rfkill->data, &newstate))
140 rfkill->state = newstate;
141
142 switch (state) {
143 case RFKILL_STATE_HARD_BLOCKED:
144 /* typically happens when refreshing hardware state,
145 * such as on resume */
146 state = RFKILL_STATE_SOFT_BLOCKED;
147 break;
148 case RFKILL_STATE_UNBLOCKED:
149 /* force can't override this, only rfkill_force_state() can */
150 if (rfkill->state == RFKILL_STATE_HARD_BLOCKED)
151 return -EPERM;
152 break;
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 */
157 break;
158 default:
159 WARN(1, KERN_WARNING
160 "rfkill: illegal state %d passed as parameter "
161 "to rfkill_toggle_radio\n", state);
162 return -EINVAL;
163 }
164
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;
170 }
171
172 if (force || rfkill->state != oldstate)
173 rfkill_uevent(rfkill);
174
175 return retval;
176}
177
178/**
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
182 *
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.
186 *
187 * Caller must have acquired rfkill_global_mutex.
188 */
189static void __rfkill_switch_all(const enum rfkill_type type,
190 const enum rfkill_state state)
191{
192 struct rfkill *rfkill;
193
194 if (WARN((state >= RFKILL_STATE_MAX || type >= RFKILL_TYPE_MAX),
195 KERN_WARNING
196 "rfkill: illegal state %d or type %d "
197 "passed as parameter to __rfkill_switch_all\n",
198 state, type))
199 return;
200
201 rfkill_global_states[type].current_state = state;
202 list_for_each_entry(rfkill, &rfkill_list, node) {
203 if ((!rfkill->user_claim) && (rfkill->type == type)) {
204 mutex_lock(&rfkill->mutex);
205 rfkill_toggle_radio(rfkill, state, 0);
206 mutex_unlock(&rfkill->mutex);
207 }
208 }
209}
210
211/**
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
215 *
216 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
217 * Please refer to __rfkill_switch_all() for details.
218 *
219 * Does nothing if the EPO lock is active.
220 */
221void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
222{
223 mutex_lock(&rfkill_global_mutex);
224 if (!rfkill_epo_lock_active)
225 __rfkill_switch_all(type, state);
226 mutex_unlock(&rfkill_global_mutex);
227}
228EXPORT_SYMBOL(rfkill_switch_all);
229
230/**
231 * rfkill_epo - emergency power off all transmitters
232 *
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.
235 *
236 * The global state before the EPO is saved and can be restored later
237 * using rfkill_restore_states().
238 */
239void rfkill_epo(void)
240{
241 struct rfkill *rfkill;
242 int i;
243
244 mutex_lock(&rfkill_global_mutex);
245
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);
251 }
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;
257 }
258 mutex_unlock(&rfkill_global_mutex);
259}
260EXPORT_SYMBOL_GPL(rfkill_epo);
261
262/**
263 * rfkill_restore_states - restore global states
264 *
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().
268 */
269void rfkill_restore_states(void)
270{
271 int i;
272
273 mutex_lock(&rfkill_global_mutex);
274
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);
279}
280EXPORT_SYMBOL_GPL(rfkill_restore_states);
281
282/**
283 * rfkill_remove_epo_lock - unlock state changes
284 *
285 * Used by rfkill-input manually unlock state changes, when
286 * the EPO switch is deactivated.
287 */
288void rfkill_remove_epo_lock(void)
289{
290 mutex_lock(&rfkill_global_mutex);
291 rfkill_epo_lock_active = false;
292 mutex_unlock(&rfkill_global_mutex);
293}
294EXPORT_SYMBOL_GPL(rfkill_remove_epo_lock);
295
296/**
297 * rfkill_is_epo_lock_active - returns true EPO is active
298 *
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.
302 *
303 * Can be called in atomic context.
304 */
305bool rfkill_is_epo_lock_active(void)
306{
307 return rfkill_epo_lock_active;
308}
309EXPORT_SYMBOL_GPL(rfkill_is_epo_lock_active);
310
311/**
312 * rfkill_get_global_state - returns global state for a type
313 * @type: the type to get the global state of
314 *
315 * Returns the current global state for a given wireless
316 * device type.
317 */
318enum rfkill_state rfkill_get_global_state(const enum rfkill_type type)
319{
320 return rfkill_global_states[type].current_state;
321}
322EXPORT_SYMBOL_GPL(rfkill_get_global_state);
323
324/**
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.
328 *
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.
333 *
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.
338 *
339 * This function may not be called from an atomic context.
340 */
341int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
342{
343 enum rfkill_state oldstate;
344
345 BUG_ON(!rfkill);
346 if (WARN((state >= RFKILL_STATE_MAX),
347 KERN_WARNING
348 "rfkill: illegal state %d passed as parameter "
349 "to rfkill_force_state\n", state))
350 return -EINVAL;
351
352 mutex_lock(&rfkill->mutex);
353
354 oldstate = rfkill->state;
355 rfkill->state = state;
356
357 if (state != oldstate)
358 rfkill_uevent(rfkill);
359
360 mutex_unlock(&rfkill->mutex);
361
362 return 0;
363}
364EXPORT_SYMBOL(rfkill_force_state);
365
366static ssize_t rfkill_name_show(struct device *dev,
367 struct device_attribute *attr,
368 char *buf)
369{
370 struct rfkill *rfkill = to_rfkill(dev);
371
372 return sprintf(buf, "%s\n", rfkill->name);
373}
374
375static const char *rfkill_get_type_str(enum rfkill_type type)
376{
377 switch (type) {
378 case RFKILL_TYPE_WLAN:
379 return "wlan";
380 case RFKILL_TYPE_BLUETOOTH:
381 return "bluetooth";
382 case RFKILL_TYPE_UWB:
383 return "ultrawideband";
384 case RFKILL_TYPE_WIMAX:
385 return "wimax";
386 case RFKILL_TYPE_WWAN:
387 return "wwan";
388 default:
389 BUG();
390 }
391}
392
393static ssize_t rfkill_type_show(struct device *dev,
394 struct device_attribute *attr,
395 char *buf)
396{
397 struct rfkill *rfkill = to_rfkill(dev);
398
399 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
400}
401
402static ssize_t rfkill_state_show(struct device *dev,
403 struct device_attribute *attr,
404 char *buf)
405{
406 struct rfkill *rfkill = to_rfkill(dev);
407
408 update_rfkill_state(rfkill);
409 return sprintf(buf, "%d\n", rfkill->state);
410}
411
412static ssize_t rfkill_state_store(struct device *dev,
413 struct device_attribute *attr,
414 const char *buf, size_t count)
415{
416 struct rfkill *rfkill = to_rfkill(dev);
417 unsigned long state;
418 int error;
419
420 if (!capable(CAP_NET_ADMIN))
421 return -EPERM;
422
423 error = strict_strtoul(buf, 0, &state);
424 if (error)
425 return error;
426
427 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
428 if (state != RFKILL_STATE_UNBLOCKED &&
429 state != RFKILL_STATE_SOFT_BLOCKED)
430 return -EINVAL;
431
432 error = mutex_lock_killable(&rfkill->mutex);
433 if (error)
434 return error;
435
436 if (!rfkill_epo_lock_active)
437 error = rfkill_toggle_radio(rfkill, state, 0);
438 else
439 error = -EPERM;
440
441 mutex_unlock(&rfkill->mutex);
442
443 return error ? error : count;
444}
445
446static ssize_t rfkill_claim_show(struct device *dev,
447 struct device_attribute *attr,
448 char *buf)
449{
450 struct rfkill *rfkill = to_rfkill(dev);
451
452 return sprintf(buf, "%d\n", rfkill->user_claim);
453}
454
455static ssize_t rfkill_claim_store(struct device *dev,
456 struct device_attribute *attr,
457 const char *buf, size_t count)
458{
459 struct rfkill *rfkill = to_rfkill(dev);
460 unsigned long claim_tmp;
461 bool claim;
462 int error;
463
464 if (!capable(CAP_NET_ADMIN))
465 return -EPERM;
466
467 if (rfkill->user_claim_unsupported)
468 return -EOPNOTSUPP;
469
470 error = strict_strtoul(buf, 0, &claim_tmp);
471 if (error)
472 return error;
473 claim = !!claim_tmp;
474
475 /*
476 * Take the global lock to make sure the kernel is not in
477 * the middle of rfkill_switch_all
478 */
479 error = mutex_lock_killable(&rfkill_global_mutex);
480 if (error)
481 return error;
482
483 if (rfkill->user_claim != claim) {
484 if (!claim && !rfkill_epo_lock_active) {
485 mutex_lock(&rfkill->mutex);
486 rfkill_toggle_radio(rfkill,
487 rfkill_global_states[rfkill->type].current_state,
488 0);
489 mutex_unlock(&rfkill->mutex);
490 }
491 rfkill->user_claim = claim;
492 }
493
494 mutex_unlock(&rfkill_global_mutex);
495
496 return error ? error : count;
497}
498
499static struct device_attribute rfkill_dev_attrs[] = {
500 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
501 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
502 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
503 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
504 __ATTR_NULL
505};
506
507static void rfkill_release(struct device *dev)
508{
509 struct rfkill *rfkill = to_rfkill(dev);
510
511 kfree(rfkill);
512 module_put(THIS_MODULE);
513}
514
515#ifdef CONFIG_PM
516static int rfkill_suspend(struct device *dev, pm_message_t state)
517{
518 struct rfkill *rfkill = to_rfkill(dev);
519
520 /* mark class device as suspended */
521 if (dev->power.power_state.event != state.event)
522 dev->power.power_state = state;
523
524 /* store state for the resume handler */
525 rfkill->state_for_resume = rfkill->state;
526
527 return 0;
528}
529
530static int rfkill_resume(struct device *dev)
531{
532 struct rfkill *rfkill = to_rfkill(dev);
533 enum rfkill_state newstate;
534
535 if (dev->power.power_state.event != PM_EVENT_ON) {
536 mutex_lock(&rfkill->mutex);
537
538 dev->power.power_state.event = PM_EVENT_ON;
539
540 /*
541 * rfkill->state could have been modified before we got
542 * called, and won't be updated by rfkill_toggle_radio()
543 * in force mode. Sync it FIRST.
544 */
545 if (rfkill->get_state &&
546 !rfkill->get_state(rfkill->data, &newstate))
547 rfkill->state = newstate;
548
549 /*
550 * If we are under EPO, kick transmitter offline,
551 * otherwise restore to pre-suspend state.
552 *
553 * Issue a notification in any case
554 */
555 rfkill_toggle_radio(rfkill,
556 rfkill_epo_lock_active ?
557 RFKILL_STATE_SOFT_BLOCKED :
558 rfkill->state_for_resume,
559 1);
560
561 mutex_unlock(&rfkill->mutex);
562 }
563
564 return 0;
565}
566#else
567#define rfkill_suspend NULL
568#define rfkill_resume NULL
569#endif
570
571static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
572{
573 struct rfkill *rfkill = to_rfkill(dev);
574 int error;
575
576 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
577 if (error)
578 return error;
579 error = add_uevent_var(env, "RFKILL_TYPE=%s",
580 rfkill_get_type_str(rfkill->type));
581 if (error)
582 return error;
583 error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state);
584 return error;
585}
586
587static struct class rfkill_class = {
588 .name = "rfkill",
589 .dev_release = rfkill_release,
590 .dev_attrs = rfkill_dev_attrs,
591 .suspend = rfkill_suspend,
592 .resume = rfkill_resume,
593 .dev_uevent = rfkill_dev_uevent,
594};
595
596static int rfkill_check_duplicity(const struct rfkill *rfkill)
597{
598 struct rfkill *p;
599 unsigned long seen[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
600
601 memset(seen, 0, sizeof(seen));
602
603 list_for_each_entry(p, &rfkill_list, node) {
604 if (WARN((p == rfkill), KERN_WARNING
605 "rfkill: illegal attempt to register "
606 "an already registered rfkill struct\n"))
607 return -EEXIST;
608 set_bit(p->type, seen);
609 }
610
611 /* 0: first switch of its kind */
612 return (test_bit(rfkill->type, seen)) ? 1 : 0;
613}
614
615static int rfkill_add_switch(struct rfkill *rfkill)
616{
617 int error;
618
619 mutex_lock(&rfkill_global_mutex);
620
621 error = rfkill_check_duplicity(rfkill);
622 if (error < 0)
623 goto unlock_out;
624
625 if (!error) {
626 /* lock default after first use */
627 set_bit(rfkill->type, rfkill_states_lockdflt);
628 rfkill_global_states[rfkill->type].current_state =
629 rfkill_global_states[rfkill->type].default_state;
630 }
631
632 rfkill_toggle_radio(rfkill,
633 rfkill_global_states[rfkill->type].current_state,
634 0);
635
636 list_add_tail(&rfkill->node, &rfkill_list);
637
638 error = 0;
639unlock_out:
640 mutex_unlock(&rfkill_global_mutex);
641
642 return error;
643}
644
645static void rfkill_remove_switch(struct rfkill *rfkill)
646{
647 mutex_lock(&rfkill_global_mutex);
648 list_del_init(&rfkill->node);
649 mutex_unlock(&rfkill_global_mutex);
650
651 mutex_lock(&rfkill->mutex);
652 rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
653 mutex_unlock(&rfkill->mutex);
654}
655
656/**
657 * rfkill_allocate - allocate memory for rfkill structure.
658 * @parent: device that has rf switch on it
659 * @type: type of the switch (RFKILL_TYPE_*)
660 *
661 * This function should be called by the network driver when it needs
662 * rfkill structure. Once the structure is allocated the driver should
663 * finish its initialization by setting the name, private data, enable_radio
664 * and disable_radio methods and then register it with rfkill_register().
665 *
666 * NOTE: If registration fails the structure shoudl be freed by calling
667 * rfkill_free() otherwise rfkill_unregister() should be used.
668 */
669struct rfkill * __must_check rfkill_allocate(struct device *parent,
670 enum rfkill_type type)
671{
672 struct rfkill *rfkill;
673 struct device *dev;
674
675 if (WARN((type >= RFKILL_TYPE_MAX),
676 KERN_WARNING
677 "rfkill: illegal type %d passed as parameter "
678 "to rfkill_allocate\n", type))
679 return NULL;
680
681 rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
682 if (!rfkill)
683 return NULL;
684
685 mutex_init(&rfkill->mutex);
686 INIT_LIST_HEAD(&rfkill->node);
687 rfkill->type = type;
688
689 dev = &rfkill->dev;
690 dev->class = &rfkill_class;
691 dev->parent = parent;
692 device_initialize(dev);
693
694 __module_get(THIS_MODULE);
695
696 return rfkill;
697}
698EXPORT_SYMBOL(rfkill_allocate);
699
700/**
701 * rfkill_free - Mark rfkill structure for deletion
702 * @rfkill: rfkill structure to be destroyed
703 *
704 * Decrements reference count of the rfkill structure so it is destroyed.
705 * Note that rfkill_free() should _not_ be called after rfkill_unregister().
706 */
707void rfkill_free(struct rfkill *rfkill)
708{
709 if (rfkill)
710 put_device(&rfkill->dev);
711}
712EXPORT_SYMBOL(rfkill_free);
713
714static void rfkill_led_trigger_register(struct rfkill *rfkill)
715{
716#ifdef CONFIG_RFKILL_LEDS
717 int error;
718
719 if (!rfkill->led_trigger.name)
720 rfkill->led_trigger.name = dev_name(&rfkill->dev);
721 if (!rfkill->led_trigger.activate)
722 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
723 error = led_trigger_register(&rfkill->led_trigger);
724 if (error)
725 rfkill->led_trigger.name = NULL;
726#endif /* CONFIG_RFKILL_LEDS */
727}
728
729static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
730{
731#ifdef CONFIG_RFKILL_LEDS
732 if (rfkill->led_trigger.name) {
733 led_trigger_unregister(&rfkill->led_trigger);
734 rfkill->led_trigger.name = NULL;
735 }
736#endif
737}
738
739/**
740 * rfkill_register - Register a rfkill structure.
741 * @rfkill: rfkill structure to be registered
742 *
743 * This function should be called by the network driver when the rfkill
744 * structure needs to be registered. Immediately from registration the
745 * switch driver should be able to service calls to toggle_radio.
746 */
747int __must_check rfkill_register(struct rfkill *rfkill)
748{
749 static atomic_t rfkill_no = ATOMIC_INIT(0);
750 struct device *dev = &rfkill->dev;
751 int error;
752
753 if (WARN((!rfkill || !rfkill->toggle_radio ||
754 rfkill->type >= RFKILL_TYPE_MAX ||
755 rfkill->state >= RFKILL_STATE_MAX),
756 KERN_WARNING
757 "rfkill: attempt to register a "
758 "badly initialized rfkill struct\n"))
759 return -EINVAL;
760
761 dev_set_name(dev, "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
762
763 rfkill_led_trigger_register(rfkill);
764
765 error = rfkill_add_switch(rfkill);
766 if (error) {
767 rfkill_led_trigger_unregister(rfkill);
768 return error;
769 }
770
771 error = device_add(dev);
772 if (error) {
773 rfkill_remove_switch(rfkill);
774 rfkill_led_trigger_unregister(rfkill);
775 return error;
776 }
777
778 return 0;
779}
780EXPORT_SYMBOL(rfkill_register);
781
782/**
783 * rfkill_unregister - Unregister a rfkill structure.
784 * @rfkill: rfkill structure to be unregistered
785 *
786 * This function should be called by the network driver during device
787 * teardown to destroy rfkill structure. Note that rfkill_free() should
788 * _not_ be called after rfkill_unregister().
789 */
790void rfkill_unregister(struct rfkill *rfkill)
791{
792 BUG_ON(!rfkill);
793 device_del(&rfkill->dev);
794 rfkill_remove_switch(rfkill);
795 rfkill_led_trigger_unregister(rfkill);
796 put_device(&rfkill->dev);
797}
798EXPORT_SYMBOL(rfkill_unregister);
799
800/**
801 * rfkill_set_default - set initial value for a switch type
802 * @type - the type of switch to set the default state of
803 * @state - the new default state for that group of switches
804 *
805 * Sets the initial state rfkill should use for a given type.
806 * The following initial states are allowed: RFKILL_STATE_SOFT_BLOCKED
807 * and RFKILL_STATE_UNBLOCKED.
808 *
809 * This function is meant to be used by platform drivers for platforms
810 * that can save switch state across power down/reboot.
811 *
812 * The default state for each switch type can be changed exactly once.
813 * After a switch of that type is registered, the default state cannot
814 * be changed anymore. This guards against multiple drivers it the
815 * same platform trying to set the initial switch default state, which
816 * is not allowed.
817 *
818 * Returns -EPERM if the state has already been set once or is in use,
819 * so drivers likely want to either ignore or at most printk(KERN_NOTICE)
820 * if this function returns -EPERM.
821 *
822 * Returns 0 if the new default state was set, or an error if it
823 * could not be set.
824 */
825int rfkill_set_default(enum rfkill_type type, enum rfkill_state state)
826{
827 int error;
828
829 if (WARN((type >= RFKILL_TYPE_MAX ||
830 (state != RFKILL_STATE_SOFT_BLOCKED &&
831 state != RFKILL_STATE_UNBLOCKED)),
832 KERN_WARNING
833 "rfkill: illegal state %d or type %d passed as "
834 "parameter to rfkill_set_default\n", state, type))
835 return -EINVAL;
836
837 mutex_lock(&rfkill_global_mutex);
838
839 if (!test_and_set_bit(type, rfkill_states_lockdflt)) {
840 rfkill_global_states[type].default_state = state;
841 rfkill_global_states[type].current_state = state;
842 error = 0;
843 } else
844 error = -EPERM;
845
846 mutex_unlock(&rfkill_global_mutex);
847 return error;
848}
849EXPORT_SYMBOL_GPL(rfkill_set_default);
850
851/*
852 * Rfkill module initialization/deinitialization.
853 */
854static int __init rfkill_init(void)
855{
856 int error;
857 int i;
858
859 /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
860 if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED &&
861 rfkill_default_state != RFKILL_STATE_UNBLOCKED)
862 return -EINVAL;
863
864 for (i = 0; i < RFKILL_TYPE_MAX; i++)
865 rfkill_global_states[i].default_state = rfkill_default_state;
866
867 error = class_register(&rfkill_class);
868 if (error) {
869 printk(KERN_ERR "rfkill: unable to register rfkill class\n");
870 return error;
871 }
872
873 return 0;
874}
875
876static void __exit rfkill_exit(void)
877{
878 class_unregister(&rfkill_class);
879}
880
881subsys_initcall(rfkill_init);
882module_exit(rfkill_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2025-06-10 18:31:36 -0400