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1/*
2 * Copyright (C) 2006 - 2007 Ivo van Doorn
3 * Copyright (C) 2007 Dmitry Torokhov
4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the
18 * Free Software Foundation, Inc.,
19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/workqueue.h>
26#include <linux/capability.h>
27#include <linux/list.h>
28#include <linux/mutex.h>
29#include <linux/rfkill.h>
30#include <linux/sched.h>
31#include <linux/spinlock.h>
32#include <linux/miscdevice.h>
33#include <linux/wait.h>
34#include <linux/poll.h>
35#include <linux/fs.h>
36#include <linux/slab.h>
37
38#include "rfkill.h"
39
40#define POLL_INTERVAL (5 * HZ)
41
42#define RFKILL_BLOCK_HW BIT(0)
43#define RFKILL_BLOCK_SW BIT(1)
44#define RFKILL_BLOCK_SW_PREV BIT(2)
45#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
46 RFKILL_BLOCK_SW |\
47 RFKILL_BLOCK_SW_PREV)
48#define RFKILL_BLOCK_SW_SETCALL BIT(31)
49
50struct rfkill {
51 spinlock_t lock;
52
53 const char *name;
54 enum rfkill_type type;
55
56 unsigned long state;
57
58 u32 idx;
59
60 bool registered;
61 bool persistent;
62
63 const struct rfkill_ops *ops;
64 void *data;
65
66#ifdef CONFIG_RFKILL_LEDS
67 struct led_trigger led_trigger;
68 const char *ledtrigname;
69#endif
70
71 struct device dev;
72 struct list_head node;
73
74 struct delayed_work poll_work;
75 struct work_struct uevent_work;
76 struct work_struct sync_work;
77};
78#define to_rfkill(d) container_of(d, struct rfkill, dev)
79
80struct rfkill_int_event {
81 struct list_head list;
82 struct rfkill_event ev;
83};
84
85struct rfkill_data {
86 struct list_head list;
87 struct list_head events;
88 struct mutex mtx;
89 wait_queue_head_t read_wait;
90 bool input_handler;
91};
92
93
94MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
95MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
96MODULE_DESCRIPTION("RF switch support");
97MODULE_LICENSE("GPL");
98
99
100/*
101 * The locking here should be made much smarter, we currently have
102 * a bit of a stupid situation because drivers might want to register
103 * the rfkill struct under their own lock, and take this lock during
104 * rfkill method calls -- which will cause an AB-BA deadlock situation.
105 *
106 * To fix that, we need to rework this code here to be mostly lock-free
107 * and only use the mutex for list manipulations, not to protect the
108 * various other global variables. Then we can avoid holding the mutex
109 * around driver operations, and all is happy.
110 */
111static LIST_HEAD(rfkill_list); /* list of registered rf switches */
112static DEFINE_MUTEX(rfkill_global_mutex);
113static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
114
115static unsigned int rfkill_default_state = 1;
116module_param_named(default_state, rfkill_default_state, uint, 0444);
117MODULE_PARM_DESC(default_state,
118 "Default initial state for all radio types, 0 = radio off");
119
120static struct {
121 bool cur, sav;
122} rfkill_global_states[NUM_RFKILL_TYPES];
123
124static bool rfkill_epo_lock_active;
125
126
127#ifdef CONFIG_RFKILL_LEDS
128static void rfkill_led_trigger_event(struct rfkill *rfkill)
129{
130 struct led_trigger *trigger;
131
132 if (!rfkill->registered)
133 return;
134
135 trigger = &rfkill->led_trigger;
136
137 if (rfkill->state & RFKILL_BLOCK_ANY)
138 led_trigger_event(trigger, LED_OFF);
139 else
140 led_trigger_event(trigger, LED_FULL);
141}
142
143static void rfkill_led_trigger_activate(struct led_classdev *led)
144{
145 struct rfkill *rfkill;
146
147 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
148
149 rfkill_led_trigger_event(rfkill);
150}
151
152static int rfkill_led_trigger_register(struct rfkill *rfkill)
153{
154 rfkill->led_trigger.name = rfkill->ledtrigname
155 ? : dev_name(&rfkill->dev);
156 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
157 return led_trigger_register(&rfkill->led_trigger);
158}
159
160static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
161{
162 led_trigger_unregister(&rfkill->led_trigger);
163}
164#else
165static void rfkill_led_trigger_event(struct rfkill *rfkill)
166{
167}
168
169static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
170{
171 return 0;
172}
173
174static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
175{
176}
177#endif /* CONFIG_RFKILL_LEDS */
178
179static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
180 enum rfkill_operation op)
181{
182 unsigned long flags;
183
184 ev->idx = rfkill->idx;
185 ev->type = rfkill->type;
186 ev->op = op;
187
188 spin_lock_irqsave(&rfkill->lock, flags);
189 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
190 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
191 RFKILL_BLOCK_SW_PREV));
192 spin_unlock_irqrestore(&rfkill->lock, flags);
193}
194
195static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
196{
197 struct rfkill_data *data;
198 struct rfkill_int_event *ev;
199
200 list_for_each_entry(data, &rfkill_fds, list) {
201 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
202 if (!ev)
203 continue;
204 rfkill_fill_event(&ev->ev, rfkill, op);
205 mutex_lock(&data->mtx);
206 list_add_tail(&ev->list, &data->events);
207 mutex_unlock(&data->mtx);
208 wake_up_interruptible(&data->read_wait);
209 }
210}
211
212static void rfkill_event(struct rfkill *rfkill)
213{
214 if (!rfkill->registered)
215 return;
216
217 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
218
219 /* also send event to /dev/rfkill */
220 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
221}
222
223static bool __rfkill_set_hw_state(struct rfkill *rfkill,
224 bool blocked, bool *change)
225{
226 unsigned long flags;
227 bool prev, any;
228
229 BUG_ON(!rfkill);
230
231 spin_lock_irqsave(&rfkill->lock, flags);
232 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
233 if (blocked)
234 rfkill->state |= RFKILL_BLOCK_HW;
235 else
236 rfkill->state &= ~RFKILL_BLOCK_HW;
237 *change = prev != blocked;
238 any = rfkill->state & RFKILL_BLOCK_ANY;
239 spin_unlock_irqrestore(&rfkill->lock, flags);
240
241 rfkill_led_trigger_event(rfkill);
242
243 return any;
244}
245
246/**
247 * rfkill_set_block - wrapper for set_block method
248 *
249 * @rfkill: the rfkill struct to use
250 * @blocked: the new software state
251 *
252 * Calls the set_block method (when applicable) and handles notifications
253 * etc. as well.
254 */
255static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
256{
257 unsigned long flags;
258 int err;
259
260 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
261 return;
262
263 /*
264 * Some platforms (...!) generate input events which affect the
265 * _hard_ kill state -- whenever something tries to change the
266 * current software state query the hardware state too.
267 */
268 if (rfkill->ops->query)
269 rfkill->ops->query(rfkill, rfkill->data);
270
271 spin_lock_irqsave(&rfkill->lock, flags);
272 if (rfkill->state & RFKILL_BLOCK_SW)
273 rfkill->state |= RFKILL_BLOCK_SW_PREV;
274 else
275 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
276
277 if (blocked)
278 rfkill->state |= RFKILL_BLOCK_SW;
279 else
280 rfkill->state &= ~RFKILL_BLOCK_SW;
281
282 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
283 spin_unlock_irqrestore(&rfkill->lock, flags);
284
285 err = rfkill->ops->set_block(rfkill->data, blocked);
286
287 spin_lock_irqsave(&rfkill->lock, flags);
288 if (err) {
289 /*
290 * Failed -- reset status to _prev, this may be different
291 * from what set set _PREV to earlier in this function
292 * if rfkill_set_sw_state was invoked.
293 */
294 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
295 rfkill->state |= RFKILL_BLOCK_SW;
296 else
297 rfkill->state &= ~RFKILL_BLOCK_SW;
298 }
299 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
300 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
301 spin_unlock_irqrestore(&rfkill->lock, flags);
302
303 rfkill_led_trigger_event(rfkill);
304 rfkill_event(rfkill);
305}
306
307#ifdef CONFIG_RFKILL_INPUT
308static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
309
310/**
311 * __rfkill_switch_all - Toggle state of all switches of given type
312 * @type: type of interfaces to be affected
313 * @state: the new state
314 *
315 * This function sets the state of all switches of given type,
316 * unless a specific switch is claimed by userspace (in which case,
317 * that switch is left alone) or suspended.
318 *
319 * Caller must have acquired rfkill_global_mutex.
320 */
321static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
322{
323 struct rfkill *rfkill;
324
325 rfkill_global_states[type].cur = blocked;
326 list_for_each_entry(rfkill, &rfkill_list, node) {
327 if (rfkill->type != type)
328 continue;
329
330 rfkill_set_block(rfkill, blocked);
331 }
332}
333
334/**
335 * rfkill_switch_all - Toggle state of all switches of given type
336 * @type: type of interfaces to be affected
337 * @state: the new state
338 *
339 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
340 * Please refer to __rfkill_switch_all() for details.
341 *
342 * Does nothing if the EPO lock is active.
343 */
344void rfkill_switch_all(enum rfkill_type type, bool blocked)
345{
346 if (atomic_read(&rfkill_input_disabled))
347 return;
348
349 mutex_lock(&rfkill_global_mutex);
350
351 if (!rfkill_epo_lock_active)
352 __rfkill_switch_all(type, blocked);
353
354 mutex_unlock(&rfkill_global_mutex);
355}
356
357/**
358 * rfkill_epo - emergency power off all transmitters
359 *
360 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
361 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
362 *
363 * The global state before the EPO is saved and can be restored later
364 * using rfkill_restore_states().
365 */
366void rfkill_epo(void)
367{
368 struct rfkill *rfkill;
369 int i;
370
371 if (atomic_read(&rfkill_input_disabled))
372 return;
373
374 mutex_lock(&rfkill_global_mutex);
375
376 rfkill_epo_lock_active = true;
377 list_for_each_entry(rfkill, &rfkill_list, node)
378 rfkill_set_block(rfkill, true);
379
380 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
381 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
382 rfkill_global_states[i].cur = true;
383 }
384
385 mutex_unlock(&rfkill_global_mutex);
386}
387
388/**
389 * rfkill_restore_states - restore global states
390 *
391 * Restore (and sync switches to) the global state from the
392 * states in rfkill_default_states. This can undo the effects of
393 * a call to rfkill_epo().
394 */
395void rfkill_restore_states(void)
396{
397 int i;
398
399 if (atomic_read(&rfkill_input_disabled))
400 return;
401
402 mutex_lock(&rfkill_global_mutex);
403
404 rfkill_epo_lock_active = false;
405 for (i = 0; i < NUM_RFKILL_TYPES; i++)
406 __rfkill_switch_all(i, rfkill_global_states[i].sav);
407 mutex_unlock(&rfkill_global_mutex);
408}
409
410/**
411 * rfkill_remove_epo_lock - unlock state changes
412 *
413 * Used by rfkill-input manually unlock state changes, when
414 * the EPO switch is deactivated.
415 */
416void rfkill_remove_epo_lock(void)
417{
418 if (atomic_read(&rfkill_input_disabled))
419 return;
420
421 mutex_lock(&rfkill_global_mutex);
422 rfkill_epo_lock_active = false;
423 mutex_unlock(&rfkill_global_mutex);
424}
425
426/**
427 * rfkill_is_epo_lock_active - returns true EPO is active
428 *
429 * Returns 0 (false) if there is NOT an active EPO contidion,
430 * and 1 (true) if there is an active EPO contition, which
431 * locks all radios in one of the BLOCKED states.
432 *
433 * Can be called in atomic context.
434 */
435bool rfkill_is_epo_lock_active(void)
436{
437 return rfkill_epo_lock_active;
438}
439
440/**
441 * rfkill_get_global_sw_state - returns global state for a type
442 * @type: the type to get the global state of
443 *
444 * Returns the current global state for a given wireless
445 * device type.
446 */
447bool rfkill_get_global_sw_state(const enum rfkill_type type)
448{
449 return rfkill_global_states[type].cur;
450}
451#endif
452
453
454bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
455{
456 bool ret, change;
457
458 ret = __rfkill_set_hw_state(rfkill, blocked, &change);
459
460 if (!rfkill->registered)
461 return ret;
462
463 if (change)
464 schedule_work(&rfkill->uevent_work);
465
466 return ret;
467}
468EXPORT_SYMBOL(rfkill_set_hw_state);
469
470static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
471{
472 u32 bit = RFKILL_BLOCK_SW;
473
474 /* if in a ops->set_block right now, use other bit */
475 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
476 bit = RFKILL_BLOCK_SW_PREV;
477
478 if (blocked)
479 rfkill->state |= bit;
480 else
481 rfkill->state &= ~bit;
482}
483
484bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
485{
486 unsigned long flags;
487 bool prev, hwblock;
488
489 BUG_ON(!rfkill);
490
491 spin_lock_irqsave(&rfkill->lock, flags);
492 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
493 __rfkill_set_sw_state(rfkill, blocked);
494 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
495 blocked = blocked || hwblock;
496 spin_unlock_irqrestore(&rfkill->lock, flags);
497
498 if (!rfkill->registered)
499 return blocked;
500
501 if (prev != blocked && !hwblock)
502 schedule_work(&rfkill->uevent_work);
503
504 rfkill_led_trigger_event(rfkill);
505
506 return blocked;
507}
508EXPORT_SYMBOL(rfkill_set_sw_state);
509
510void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
511{
512 unsigned long flags;
513
514 BUG_ON(!rfkill);
515 BUG_ON(rfkill->registered);
516
517 spin_lock_irqsave(&rfkill->lock, flags);
518 __rfkill_set_sw_state(rfkill, blocked);
519 rfkill->persistent = true;
520 spin_unlock_irqrestore(&rfkill->lock, flags);
521}
522EXPORT_SYMBOL(rfkill_init_sw_state);
523
524void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
525{
526 unsigned long flags;
527 bool swprev, hwprev;
528
529 BUG_ON(!rfkill);
530
531 spin_lock_irqsave(&rfkill->lock, flags);
532
533 /*
534 * No need to care about prev/setblock ... this is for uevent only
535 * and that will get triggered by rfkill_set_block anyway.
536 */
537 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
538 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
539 __rfkill_set_sw_state(rfkill, sw);
540 if (hw)
541 rfkill->state |= RFKILL_BLOCK_HW;
542 else
543 rfkill->state &= ~RFKILL_BLOCK_HW;
544
545 spin_unlock_irqrestore(&rfkill->lock, flags);
546
547 if (!rfkill->registered) {
548 rfkill->persistent = true;
549 } else {
550 if (swprev != sw || hwprev != hw)
551 schedule_work(&rfkill->uevent_work);
552
553 rfkill_led_trigger_event(rfkill);
554 }
555}
556EXPORT_SYMBOL(rfkill_set_states);
557
558static ssize_t rfkill_name_show(struct device *dev,
559 struct device_attribute *attr,
560 char *buf)
561{
562 struct rfkill *rfkill = to_rfkill(dev);
563
564 return sprintf(buf, "%s\n", rfkill->name);
565}
566
567static const char *rfkill_get_type_str(enum rfkill_type type)
568{
569 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_FM + 1);
570
571 switch (type) {
572 case RFKILL_TYPE_WLAN:
573 return "wlan";
574 case RFKILL_TYPE_BLUETOOTH:
575 return "bluetooth";
576 case RFKILL_TYPE_UWB:
577 return "ultrawideband";
578 case RFKILL_TYPE_WIMAX:
579 return "wimax";
580 case RFKILL_TYPE_WWAN:
581 return "wwan";
582 case RFKILL_TYPE_GPS:
583 return "gps";
584 case RFKILL_TYPE_FM:
585 return "fm";
586 default:
587 BUG();
588 }
589}
590
591static ssize_t rfkill_type_show(struct device *dev,
592 struct device_attribute *attr,
593 char *buf)
594{
595 struct rfkill *rfkill = to_rfkill(dev);
596
597 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
598}
599
600static ssize_t rfkill_idx_show(struct device *dev,
601 struct device_attribute *attr,
602 char *buf)
603{
604 struct rfkill *rfkill = to_rfkill(dev);
605
606 return sprintf(buf, "%d\n", rfkill->idx);
607}
608
609static ssize_t rfkill_persistent_show(struct device *dev,
610 struct device_attribute *attr,
611 char *buf)
612{
613 struct rfkill *rfkill = to_rfkill(dev);
614
615 return sprintf(buf, "%d\n", rfkill->persistent);
616}
617
618static ssize_t rfkill_hard_show(struct device *dev,
619 struct device_attribute *attr,
620 char *buf)
621{
622 struct rfkill *rfkill = to_rfkill(dev);
623
624 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
625}
626
627static ssize_t rfkill_soft_show(struct device *dev,
628 struct device_attribute *attr,
629 char *buf)
630{
631 struct rfkill *rfkill = to_rfkill(dev);
632
633 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
634}
635
636static ssize_t rfkill_soft_store(struct device *dev,
637 struct device_attribute *attr,
638 const char *buf, size_t count)
639{
640 struct rfkill *rfkill = to_rfkill(dev);
641 unsigned long state;
642 int err;
643
644 if (!capable(CAP_NET_ADMIN))
645 return -EPERM;
646
647 err = strict_strtoul(buf, 0, &state);
648 if (err)
649 return err;
650
651 if (state > 1 )
652 return -EINVAL;
653
654 mutex_lock(&rfkill_global_mutex);
655 rfkill_set_block(rfkill, state);
656 mutex_unlock(&rfkill_global_mutex);
657
658 return err ?: count;
659}
660
661static u8 user_state_from_blocked(unsigned long state)
662{
663 if (state & RFKILL_BLOCK_HW)
664 return RFKILL_USER_STATE_HARD_BLOCKED;
665 if (state & RFKILL_BLOCK_SW)
666 return RFKILL_USER_STATE_SOFT_BLOCKED;
667
668 return RFKILL_USER_STATE_UNBLOCKED;
669}
670
671static ssize_t rfkill_state_show(struct device *dev,
672 struct device_attribute *attr,
673 char *buf)
674{
675 struct rfkill *rfkill = to_rfkill(dev);
676
677 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
678}
679
680static ssize_t rfkill_state_store(struct device *dev,
681 struct device_attribute *attr,
682 const char *buf, size_t count)
683{
684 struct rfkill *rfkill = to_rfkill(dev);
685 unsigned long state;
686 int err;
687
688 if (!capable(CAP_NET_ADMIN))
689 return -EPERM;
690
691 err = strict_strtoul(buf, 0, &state);
692 if (err)
693 return err;
694
695 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
696 state != RFKILL_USER_STATE_UNBLOCKED)
697 return -EINVAL;
698
699 mutex_lock(&rfkill_global_mutex);
700 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
701 mutex_unlock(&rfkill_global_mutex);
702
703 return err ?: count;
704}
705
706static ssize_t rfkill_claim_show(struct device *dev,
707 struct device_attribute *attr,
708 char *buf)
709{
710 return sprintf(buf, "%d\n", 0);
711}
712
713static ssize_t rfkill_claim_store(struct device *dev,
714 struct device_attribute *attr,
715 const char *buf, size_t count)
716{
717 return -EOPNOTSUPP;
718}
719
720static struct device_attribute rfkill_dev_attrs[] = {
721 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
722 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
723 __ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
724 __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
725 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
726 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
727 __ATTR(soft, S_IRUGO|S_IWUSR, rfkill_soft_show, rfkill_soft_store),
728 __ATTR(hard, S_IRUGO, rfkill_hard_show, NULL),
729 __ATTR_NULL
730};
731
732static void rfkill_release(struct device *dev)
733{
734 struct rfkill *rfkill = to_rfkill(dev);
735
736 kfree(rfkill);
737}
738
739static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
740{
741 struct rfkill *rfkill = to_rfkill(dev);
742 unsigned long flags;
743 u32 state;
744 int error;
745
746 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
747 if (error)
748 return error;
749 error = add_uevent_var(env, "RFKILL_TYPE=%s",
750 rfkill_get_type_str(rfkill->type));
751 if (error)
752 return error;
753 spin_lock_irqsave(&rfkill->lock, flags);
754 state = rfkill->state;
755 spin_unlock_irqrestore(&rfkill->lock, flags);
756 error = add_uevent_var(env, "RFKILL_STATE=%d",
757 user_state_from_blocked(state));
758 return error;
759}
760
761void rfkill_pause_polling(struct rfkill *rfkill)
762{
763 BUG_ON(!rfkill);
764
765 if (!rfkill->ops->poll)
766 return;
767
768 cancel_delayed_work_sync(&rfkill->poll_work);
769}
770EXPORT_SYMBOL(rfkill_pause_polling);
771
772void rfkill_resume_polling(struct rfkill *rfkill)
773{
774 BUG_ON(!rfkill);
775
776 if (!rfkill->ops->poll)
777 return;
778
779 schedule_work(&rfkill->poll_work.work);
780}
781EXPORT_SYMBOL(rfkill_resume_polling);
782
783static int rfkill_suspend(struct device *dev, pm_message_t state)
784{
785 struct rfkill *rfkill = to_rfkill(dev);
786
787 rfkill_pause_polling(rfkill);
788
789 return 0;
790}
791
792static int rfkill_resume(struct device *dev)
793{
794 struct rfkill *rfkill = to_rfkill(dev);
795 bool cur;
796
797 if (!rfkill->persistent) {
798 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
799 rfkill_set_block(rfkill, cur);
800 }
801
802 rfkill_resume_polling(rfkill);
803
804 return 0;
805}
806
807static struct class rfkill_class = {
808 .name = "rfkill",
809 .dev_release = rfkill_release,
810 .dev_attrs = rfkill_dev_attrs,
811 .dev_uevent = rfkill_dev_uevent,
812 .suspend = rfkill_suspend,
813 .resume = rfkill_resume,
814};
815
816bool rfkill_blocked(struct rfkill *rfkill)
817{
818 unsigned long flags;
819 u32 state;
820
821 spin_lock_irqsave(&rfkill->lock, flags);
822 state = rfkill->state;
823 spin_unlock_irqrestore(&rfkill->lock, flags);
824
825 return !!(state & RFKILL_BLOCK_ANY);
826}
827EXPORT_SYMBOL(rfkill_blocked);
828
829
830struct rfkill * __must_check rfkill_alloc(const char *name,
831 struct device *parent,
832 const enum rfkill_type type,
833 const struct rfkill_ops *ops,
834 void *ops_data)
835{
836 struct rfkill *rfkill;
837 struct device *dev;
838
839 if (WARN_ON(!ops))
840 return NULL;
841
842 if (WARN_ON(!ops->set_block))
843 return NULL;
844
845 if (WARN_ON(!name))
846 return NULL;
847
848 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
849 return NULL;
850
851 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
852 if (!rfkill)
853 return NULL;
854
855 spin_lock_init(&rfkill->lock);
856 INIT_LIST_HEAD(&rfkill->node);
857 rfkill->type = type;
858 rfkill->name = name;
859 rfkill->ops = ops;
860 rfkill->data = ops_data;
861
862 dev = &rfkill->dev;
863 dev->class = &rfkill_class;
864 dev->parent = parent;
865 device_initialize(dev);
866
867 return rfkill;
868}
869EXPORT_SYMBOL(rfkill_alloc);
870
871static void rfkill_poll(struct work_struct *work)
872{
873 struct rfkill *rfkill;
874
875 rfkill = container_of(work, struct rfkill, poll_work.work);
876
877 /*
878 * Poll hardware state -- driver will use one of the
879 * rfkill_set{,_hw,_sw}_state functions and use its
880 * return value to update the current status.
881 */
882 rfkill->ops->poll(rfkill, rfkill->data);
883
884 schedule_delayed_work(&rfkill->poll_work,
885 round_jiffies_relative(POLL_INTERVAL));
886}
887
888static void rfkill_uevent_work(struct work_struct *work)
889{
890 struct rfkill *rfkill;
891
892 rfkill = container_of(work, struct rfkill, uevent_work);
893
894 mutex_lock(&rfkill_global_mutex);
895 rfkill_event(rfkill);
896 mutex_unlock(&rfkill_global_mutex);
897}
898
899static void rfkill_sync_work(struct work_struct *work)
900{
901 struct rfkill *rfkill;
902 bool cur;
903
904 rfkill = container_of(work, struct rfkill, sync_work);
905
906 mutex_lock(&rfkill_global_mutex);
907 cur = rfkill_global_states[rfkill->type].cur;
908 rfkill_set_block(rfkill, cur);
909 mutex_unlock(&rfkill_global_mutex);
910}
911
912int __must_check rfkill_register(struct rfkill *rfkill)
913{
914 static unsigned long rfkill_no;
915 struct device *dev = &rfkill->dev;
916 int error;
917
918 BUG_ON(!rfkill);
919
920 mutex_lock(&rfkill_global_mutex);
921
922 if (rfkill->registered) {
923 error = -EALREADY;
924 goto unlock;
925 }
926
927 rfkill->idx = rfkill_no;
928 dev_set_name(dev, "rfkill%lu", rfkill_no);
929 rfkill_no++;
930
931 list_add_tail(&rfkill->node, &rfkill_list);
932
933 error = device_add(dev);
934 if (error)
935 goto remove;
936
937 error = rfkill_led_trigger_register(rfkill);
938 if (error)
939 goto devdel;
940
941 rfkill->registered = true;
942
943 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
944 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
945 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
946
947 if (rfkill->ops->poll)
948 schedule_delayed_work(&rfkill->poll_work,
949 round_jiffies_relative(POLL_INTERVAL));
950
951 if (!rfkill->persistent || rfkill_epo_lock_active) {
952 schedule_work(&rfkill->sync_work);
953 } else {
954#ifdef CONFIG_RFKILL_INPUT
955 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
956
957 if (!atomic_read(&rfkill_input_disabled))
958 __rfkill_switch_all(rfkill->type, soft_blocked);
959#endif
960 }
961
962 rfkill_send_events(rfkill, RFKILL_OP_ADD);
963
964 mutex_unlock(&rfkill_global_mutex);
965 return 0;
966
967 devdel:
968 device_del(&rfkill->dev);
969 remove:
970 list_del_init(&rfkill->node);
971 unlock:
972 mutex_unlock(&rfkill_global_mutex);
973 return error;
974}
975EXPORT_SYMBOL(rfkill_register);
976
977void rfkill_unregister(struct rfkill *rfkill)
978{
979 BUG_ON(!rfkill);
980
981 if (rfkill->ops->poll)
982 cancel_delayed_work_sync(&rfkill->poll_work);
983
984 cancel_work_sync(&rfkill->uevent_work);
985 cancel_work_sync(&rfkill->sync_work);
986
987 rfkill->registered = false;
988
989 device_del(&rfkill->dev);
990
991 mutex_lock(&rfkill_global_mutex);
992 rfkill_send_events(rfkill, RFKILL_OP_DEL);
993 list_del_init(&rfkill->node);
994 mutex_unlock(&rfkill_global_mutex);
995
996 rfkill_led_trigger_unregister(rfkill);
997}
998EXPORT_SYMBOL(rfkill_unregister);
999
1000void rfkill_destroy(struct rfkill *rfkill)
1001{
1002 if (rfkill)
1003 put_device(&rfkill->dev);
1004}
1005EXPORT_SYMBOL(rfkill_destroy);
1006
1007static int rfkill_fop_open(struct inode *inode, struct file *file)
1008{
1009 struct rfkill_data *data;
1010 struct rfkill *rfkill;
1011 struct rfkill_int_event *ev, *tmp;
1012
1013 data = kzalloc(sizeof(*data), GFP_KERNEL);
1014 if (!data)
1015 return -ENOMEM;
1016
1017 INIT_LIST_HEAD(&data->events);
1018 mutex_init(&data->mtx);
1019 init_waitqueue_head(&data->read_wait);
1020
1021 mutex_lock(&rfkill_global_mutex);
1022 mutex_lock(&data->mtx);
1023 /*
1024 * start getting events from elsewhere but hold mtx to get
1025 * startup events added first
1026 */
1027
1028 list_for_each_entry(rfkill, &rfkill_list, node) {
1029 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1030 if (!ev)
1031 goto free;
1032 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1033 list_add_tail(&ev->list, &data->events);
1034 }
1035 list_add(&data->list, &rfkill_fds);
1036 mutex_unlock(&data->mtx);
1037 mutex_unlock(&rfkill_global_mutex);
1038
1039 file->private_data = data;
1040
1041 return nonseekable_open(inode, file);
1042
1043 free:
1044 mutex_unlock(&data->mtx);
1045 mutex_unlock(&rfkill_global_mutex);
1046 mutex_destroy(&data->mtx);
1047 list_for_each_entry_safe(ev, tmp, &data->events, list)
1048 kfree(ev);
1049 kfree(data);
1050 return -ENOMEM;
1051}
1052
1053static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1054{
1055 struct rfkill_data *data = file->private_data;
1056 unsigned int res = POLLOUT | POLLWRNORM;
1057
1058 poll_wait(file, &data->read_wait, wait);
1059
1060 mutex_lock(&data->mtx);
1061 if (!list_empty(&data->events))
1062 res = POLLIN | POLLRDNORM;
1063 mutex_unlock(&data->mtx);
1064
1065 return res;
1066}
1067
1068static bool rfkill_readable(struct rfkill_data *data)
1069{
1070 bool r;
1071
1072 mutex_lock(&data->mtx);
1073 r = !list_empty(&data->events);
1074 mutex_unlock(&data->mtx);
1075
1076 return r;
1077}
1078
1079static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1080 size_t count, loff_t *pos)
1081{
1082 struct rfkill_data *data = file->private_data;
1083 struct rfkill_int_event *ev;
1084 unsigned long sz;
1085 int ret;
1086
1087 mutex_lock(&data->mtx);
1088
1089 while (list_empty(&data->events)) {
1090 if (file->f_flags & O_NONBLOCK) {
1091 ret = -EAGAIN;
1092 goto out;
1093 }
1094 mutex_unlock(&data->mtx);
1095 ret = wait_event_interruptible(data->read_wait,
1096 rfkill_readable(data));
1097 mutex_lock(&data->mtx);
1098
1099 if (ret)
1100 goto out;
1101 }
1102
1103 ev = list_first_entry(&data->events, struct rfkill_int_event,
1104 list);
1105
1106 sz = min_t(unsigned long, sizeof(ev->ev), count);
1107 ret = sz;
1108 if (copy_to_user(buf, &ev->ev, sz))
1109 ret = -EFAULT;
1110
1111 list_del(&ev->list);
1112 kfree(ev);
1113 out:
1114 mutex_unlock(&data->mtx);
1115 return ret;
1116}
1117
1118static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1119 size_t count, loff_t *pos)
1120{
1121 struct rfkill *rfkill;
1122 struct rfkill_event ev;
1123
1124 /* we don't need the 'hard' variable but accept it */
1125 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1126 return -EINVAL;
1127
1128 /*
1129 * Copy as much data as we can accept into our 'ev' buffer,
1130 * but tell userspace how much we've copied so it can determine
1131 * our API version even in a write() call, if it cares.
1132 */
1133 count = min(count, sizeof(ev));
1134 if (copy_from_user(&ev, buf, count))
1135 return -EFAULT;
1136
1137 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1138 return -EINVAL;
1139
1140 if (ev.type >= NUM_RFKILL_TYPES)
1141 return -EINVAL;
1142
1143 mutex_lock(&rfkill_global_mutex);
1144
1145 if (ev.op == RFKILL_OP_CHANGE_ALL) {
1146 if (ev.type == RFKILL_TYPE_ALL) {
1147 enum rfkill_type i;
1148 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1149 rfkill_global_states[i].cur = ev.soft;
1150 } else {
1151 rfkill_global_states[ev.type].cur = ev.soft;
1152 }
1153 }
1154
1155 list_for_each_entry(rfkill, &rfkill_list, node) {
1156 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1157 continue;
1158
1159 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1160 continue;
1161
1162 rfkill_set_block(rfkill, ev.soft);
1163 }
1164 mutex_unlock(&rfkill_global_mutex);
1165
1166 return count;
1167}
1168
1169static int rfkill_fop_release(struct inode *inode, struct file *file)
1170{
1171 struct rfkill_data *data = file->private_data;
1172 struct rfkill_int_event *ev, *tmp;
1173
1174 mutex_lock(&rfkill_global_mutex);
1175 list_del(&data->list);
1176 mutex_unlock(&rfkill_global_mutex);
1177
1178 mutex_destroy(&data->mtx);
1179 list_for_each_entry_safe(ev, tmp, &data->events, list)
1180 kfree(ev);
1181
1182#ifdef CONFIG_RFKILL_INPUT
1183 if (data->input_handler)
1184 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1185 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1186#endif
1187
1188 kfree(data);
1189
1190 return 0;
1191}
1192
1193#ifdef CONFIG_RFKILL_INPUT
1194static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1195 unsigned long arg)
1196{
1197 struct rfkill_data *data = file->private_data;
1198
1199 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1200 return -ENOSYS;
1201
1202 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1203 return -ENOSYS;
1204
1205 mutex_lock(&data->mtx);
1206
1207 if (!data->input_handler) {
1208 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1209 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1210 data->input_handler = true;
1211 }
1212
1213 mutex_unlock(&data->mtx);
1214
1215 return 0;
1216}
1217#endif
1218
1219static const struct file_operations rfkill_fops = {
1220 .owner = THIS_MODULE,
1221 .open = rfkill_fop_open,
1222 .read = rfkill_fop_read,
1223 .write = rfkill_fop_write,
1224 .poll = rfkill_fop_poll,
1225 .release = rfkill_fop_release,
1226#ifdef CONFIG_RFKILL_INPUT
1227 .unlocked_ioctl = rfkill_fop_ioctl,
1228 .compat_ioctl = rfkill_fop_ioctl,
1229#endif
1230 .llseek = no_llseek,
1231};
1232
1233static struct miscdevice rfkill_miscdev = {
1234 .name = "rfkill",
1235 .fops = &rfkill_fops,
1236 .minor = MISC_DYNAMIC_MINOR,
1237};
1238
1239static int __init rfkill_init(void)
1240{
1241 int error;
1242 int i;
1243
1244 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1245 rfkill_global_states[i].cur = !rfkill_default_state;
1246
1247 error = class_register(&rfkill_class);
1248 if (error)
1249 goto out;
1250
1251 error = misc_register(&rfkill_miscdev);
1252 if (error) {
1253 class_unregister(&rfkill_class);
1254 goto out;
1255 }
1256
1257#ifdef CONFIG_RFKILL_INPUT
1258 error = rfkill_handler_init();
1259 if (error) {
1260 misc_deregister(&rfkill_miscdev);
1261 class_unregister(&rfkill_class);
1262 goto out;
1263 }
1264#endif
1265
1266 out:
1267 return error;
1268}
1269subsys_initcall(rfkill_init);
1270
1271static void __exit rfkill_exit(void)
1272{
1273#ifdef CONFIG_RFKILL_INPUT
1274 rfkill_handler_exit();
1275#endif
1276 misc_deregister(&rfkill_miscdev);
1277 class_unregister(&rfkill_class);
1278}
1279module_exit(rfkill_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2006 - 2007 Ivo van Doorn
4 * Copyright (C) 2007 Dmitry Torokhov
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
6 */
7
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/workqueue.h>
12#include <linux/capability.h>
13#include <linux/list.h>
14#include <linux/mutex.h>
15#include <linux/rfkill.h>
16#include <linux/sched.h>
17#include <linux/spinlock.h>
18#include <linux/device.h>
19#include <linux/miscdevice.h>
20#include <linux/wait.h>
21#include <linux/poll.h>
22#include <linux/fs.h>
23#include <linux/slab.h>
24
25#include "rfkill.h"
26
27#define POLL_INTERVAL (5 * HZ)
28
29#define RFKILL_BLOCK_HW BIT(0)
30#define RFKILL_BLOCK_SW BIT(1)
31#define RFKILL_BLOCK_SW_PREV BIT(2)
32#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
33 RFKILL_BLOCK_SW |\
34 RFKILL_BLOCK_SW_PREV)
35#define RFKILL_BLOCK_SW_SETCALL BIT(31)
36
37struct rfkill {
38 spinlock_t lock;
39
40 enum rfkill_type type;
41
42 unsigned long state;
43
44 u32 idx;
45
46 bool registered;
47 bool persistent;
48 bool polling_paused;
49 bool suspended;
50
51 const struct rfkill_ops *ops;
52 void *data;
53
54#ifdef CONFIG_RFKILL_LEDS
55 struct led_trigger led_trigger;
56 const char *ledtrigname;
57#endif
58
59 struct device dev;
60 struct list_head node;
61
62 struct delayed_work poll_work;
63 struct work_struct uevent_work;
64 struct work_struct sync_work;
65 char name[];
66};
67#define to_rfkill(d) container_of(d, struct rfkill, dev)
68
69struct rfkill_int_event {
70 struct list_head list;
71 struct rfkill_event ev;
72};
73
74struct rfkill_data {
75 struct list_head list;
76 struct list_head events;
77 struct mutex mtx;
78 wait_queue_head_t read_wait;
79 bool input_handler;
80};
81
82
83MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
84MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
85MODULE_DESCRIPTION("RF switch support");
86MODULE_LICENSE("GPL");
87
88
89/*
90 * The locking here should be made much smarter, we currently have
91 * a bit of a stupid situation because drivers might want to register
92 * the rfkill struct under their own lock, and take this lock during
93 * rfkill method calls -- which will cause an AB-BA deadlock situation.
94 *
95 * To fix that, we need to rework this code here to be mostly lock-free
96 * and only use the mutex for list manipulations, not to protect the
97 * various other global variables. Then we can avoid holding the mutex
98 * around driver operations, and all is happy.
99 */
100static LIST_HEAD(rfkill_list); /* list of registered rf switches */
101static DEFINE_MUTEX(rfkill_global_mutex);
102static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
103
104static unsigned int rfkill_default_state = 1;
105module_param_named(default_state, rfkill_default_state, uint, 0444);
106MODULE_PARM_DESC(default_state,
107 "Default initial state for all radio types, 0 = radio off");
108
109static struct {
110 bool cur, sav;
111} rfkill_global_states[NUM_RFKILL_TYPES];
112
113static bool rfkill_epo_lock_active;
114
115
116#ifdef CONFIG_RFKILL_LEDS
117static void rfkill_led_trigger_event(struct rfkill *rfkill)
118{
119 struct led_trigger *trigger;
120
121 if (!rfkill->registered)
122 return;
123
124 trigger = &rfkill->led_trigger;
125
126 if (rfkill->state & RFKILL_BLOCK_ANY)
127 led_trigger_event(trigger, LED_OFF);
128 else
129 led_trigger_event(trigger, LED_FULL);
130}
131
132static int rfkill_led_trigger_activate(struct led_classdev *led)
133{
134 struct rfkill *rfkill;
135
136 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
137
138 rfkill_led_trigger_event(rfkill);
139
140 return 0;
141}
142
143const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
144{
145 return rfkill->led_trigger.name;
146}
147EXPORT_SYMBOL(rfkill_get_led_trigger_name);
148
149void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
150{
151 BUG_ON(!rfkill);
152
153 rfkill->ledtrigname = name;
154}
155EXPORT_SYMBOL(rfkill_set_led_trigger_name);
156
157static int rfkill_led_trigger_register(struct rfkill *rfkill)
158{
159 rfkill->led_trigger.name = rfkill->ledtrigname
160 ? : dev_name(&rfkill->dev);
161 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
162 return led_trigger_register(&rfkill->led_trigger);
163}
164
165static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
166{
167 led_trigger_unregister(&rfkill->led_trigger);
168}
169
170static struct led_trigger rfkill_any_led_trigger;
171static struct led_trigger rfkill_none_led_trigger;
172static struct work_struct rfkill_global_led_trigger_work;
173
174static void rfkill_global_led_trigger_worker(struct work_struct *work)
175{
176 enum led_brightness brightness = LED_OFF;
177 struct rfkill *rfkill;
178
179 mutex_lock(&rfkill_global_mutex);
180 list_for_each_entry(rfkill, &rfkill_list, node) {
181 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
182 brightness = LED_FULL;
183 break;
184 }
185 }
186 mutex_unlock(&rfkill_global_mutex);
187
188 led_trigger_event(&rfkill_any_led_trigger, brightness);
189 led_trigger_event(&rfkill_none_led_trigger,
190 brightness == LED_OFF ? LED_FULL : LED_OFF);
191}
192
193static void rfkill_global_led_trigger_event(void)
194{
195 schedule_work(&rfkill_global_led_trigger_work);
196}
197
198static int rfkill_global_led_trigger_register(void)
199{
200 int ret;
201
202 INIT_WORK(&rfkill_global_led_trigger_work,
203 rfkill_global_led_trigger_worker);
204
205 rfkill_any_led_trigger.name = "rfkill-any";
206 ret = led_trigger_register(&rfkill_any_led_trigger);
207 if (ret)
208 return ret;
209
210 rfkill_none_led_trigger.name = "rfkill-none";
211 ret = led_trigger_register(&rfkill_none_led_trigger);
212 if (ret)
213 led_trigger_unregister(&rfkill_any_led_trigger);
214 else
215 /* Delay activation until all global triggers are registered */
216 rfkill_global_led_trigger_event();
217
218 return ret;
219}
220
221static void rfkill_global_led_trigger_unregister(void)
222{
223 led_trigger_unregister(&rfkill_none_led_trigger);
224 led_trigger_unregister(&rfkill_any_led_trigger);
225 cancel_work_sync(&rfkill_global_led_trigger_work);
226}
227#else
228static void rfkill_led_trigger_event(struct rfkill *rfkill)
229{
230}
231
232static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
233{
234 return 0;
235}
236
237static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
238{
239}
240
241static void rfkill_global_led_trigger_event(void)
242{
243}
244
245static int rfkill_global_led_trigger_register(void)
246{
247 return 0;
248}
249
250static void rfkill_global_led_trigger_unregister(void)
251{
252}
253#endif /* CONFIG_RFKILL_LEDS */
254
255static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
256 enum rfkill_operation op)
257{
258 unsigned long flags;
259
260 ev->idx = rfkill->idx;
261 ev->type = rfkill->type;
262 ev->op = op;
263
264 spin_lock_irqsave(&rfkill->lock, flags);
265 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
266 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
267 RFKILL_BLOCK_SW_PREV));
268 spin_unlock_irqrestore(&rfkill->lock, flags);
269}
270
271static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
272{
273 struct rfkill_data *data;
274 struct rfkill_int_event *ev;
275
276 list_for_each_entry(data, &rfkill_fds, list) {
277 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
278 if (!ev)
279 continue;
280 rfkill_fill_event(&ev->ev, rfkill, op);
281 mutex_lock(&data->mtx);
282 list_add_tail(&ev->list, &data->events);
283 mutex_unlock(&data->mtx);
284 wake_up_interruptible(&data->read_wait);
285 }
286}
287
288static void rfkill_event(struct rfkill *rfkill)
289{
290 if (!rfkill->registered)
291 return;
292
293 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
294
295 /* also send event to /dev/rfkill */
296 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
297}
298
299/**
300 * rfkill_set_block - wrapper for set_block method
301 *
302 * @rfkill: the rfkill struct to use
303 * @blocked: the new software state
304 *
305 * Calls the set_block method (when applicable) and handles notifications
306 * etc. as well.
307 */
308static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
309{
310 unsigned long flags;
311 bool prev, curr;
312 int err;
313
314 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
315 return;
316
317 /*
318 * Some platforms (...!) generate input events which affect the
319 * _hard_ kill state -- whenever something tries to change the
320 * current software state query the hardware state too.
321 */
322 if (rfkill->ops->query)
323 rfkill->ops->query(rfkill, rfkill->data);
324
325 spin_lock_irqsave(&rfkill->lock, flags);
326 prev = rfkill->state & RFKILL_BLOCK_SW;
327
328 if (prev)
329 rfkill->state |= RFKILL_BLOCK_SW_PREV;
330 else
331 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
332
333 if (blocked)
334 rfkill->state |= RFKILL_BLOCK_SW;
335 else
336 rfkill->state &= ~RFKILL_BLOCK_SW;
337
338 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
339 spin_unlock_irqrestore(&rfkill->lock, flags);
340
341 err = rfkill->ops->set_block(rfkill->data, blocked);
342
343 spin_lock_irqsave(&rfkill->lock, flags);
344 if (err) {
345 /*
346 * Failed -- reset status to _PREV, which may be different
347 * from what we have set _PREV to earlier in this function
348 * if rfkill_set_sw_state was invoked.
349 */
350 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
351 rfkill->state |= RFKILL_BLOCK_SW;
352 else
353 rfkill->state &= ~RFKILL_BLOCK_SW;
354 }
355 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
356 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
357 curr = rfkill->state & RFKILL_BLOCK_SW;
358 spin_unlock_irqrestore(&rfkill->lock, flags);
359
360 rfkill_led_trigger_event(rfkill);
361 rfkill_global_led_trigger_event();
362
363 if (prev != curr)
364 rfkill_event(rfkill);
365}
366
367static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
368{
369 int i;
370
371 if (type != RFKILL_TYPE_ALL) {
372 rfkill_global_states[type].cur = blocked;
373 return;
374 }
375
376 for (i = 0; i < NUM_RFKILL_TYPES; i++)
377 rfkill_global_states[i].cur = blocked;
378}
379
380#ifdef CONFIG_RFKILL_INPUT
381static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
382
383/**
384 * __rfkill_switch_all - Toggle state of all switches of given type
385 * @type: type of interfaces to be affected
386 * @blocked: the new state
387 *
388 * This function sets the state of all switches of given type,
389 * unless a specific switch is suspended.
390 *
391 * Caller must have acquired rfkill_global_mutex.
392 */
393static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
394{
395 struct rfkill *rfkill;
396
397 rfkill_update_global_state(type, blocked);
398 list_for_each_entry(rfkill, &rfkill_list, node) {
399 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
400 continue;
401
402 rfkill_set_block(rfkill, blocked);
403 }
404}
405
406/**
407 * rfkill_switch_all - Toggle state of all switches of given type
408 * @type: type of interfaces to be affected
409 * @blocked: the new state
410 *
411 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
412 * Please refer to __rfkill_switch_all() for details.
413 *
414 * Does nothing if the EPO lock is active.
415 */
416void rfkill_switch_all(enum rfkill_type type, bool blocked)
417{
418 if (atomic_read(&rfkill_input_disabled))
419 return;
420
421 mutex_lock(&rfkill_global_mutex);
422
423 if (!rfkill_epo_lock_active)
424 __rfkill_switch_all(type, blocked);
425
426 mutex_unlock(&rfkill_global_mutex);
427}
428
429/**
430 * rfkill_epo - emergency power off all transmitters
431 *
432 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
433 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
434 *
435 * The global state before the EPO is saved and can be restored later
436 * using rfkill_restore_states().
437 */
438void rfkill_epo(void)
439{
440 struct rfkill *rfkill;
441 int i;
442
443 if (atomic_read(&rfkill_input_disabled))
444 return;
445
446 mutex_lock(&rfkill_global_mutex);
447
448 rfkill_epo_lock_active = true;
449 list_for_each_entry(rfkill, &rfkill_list, node)
450 rfkill_set_block(rfkill, true);
451
452 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
453 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
454 rfkill_global_states[i].cur = true;
455 }
456
457 mutex_unlock(&rfkill_global_mutex);
458}
459
460/**
461 * rfkill_restore_states - restore global states
462 *
463 * Restore (and sync switches to) the global state from the
464 * states in rfkill_default_states. This can undo the effects of
465 * a call to rfkill_epo().
466 */
467void rfkill_restore_states(void)
468{
469 int i;
470
471 if (atomic_read(&rfkill_input_disabled))
472 return;
473
474 mutex_lock(&rfkill_global_mutex);
475
476 rfkill_epo_lock_active = false;
477 for (i = 0; i < NUM_RFKILL_TYPES; i++)
478 __rfkill_switch_all(i, rfkill_global_states[i].sav);
479 mutex_unlock(&rfkill_global_mutex);
480}
481
482/**
483 * rfkill_remove_epo_lock - unlock state changes
484 *
485 * Used by rfkill-input manually unlock state changes, when
486 * the EPO switch is deactivated.
487 */
488void rfkill_remove_epo_lock(void)
489{
490 if (atomic_read(&rfkill_input_disabled))
491 return;
492
493 mutex_lock(&rfkill_global_mutex);
494 rfkill_epo_lock_active = false;
495 mutex_unlock(&rfkill_global_mutex);
496}
497
498/**
499 * rfkill_is_epo_lock_active - returns true EPO is active
500 *
501 * Returns 0 (false) if there is NOT an active EPO condition,
502 * and 1 (true) if there is an active EPO condition, which
503 * locks all radios in one of the BLOCKED states.
504 *
505 * Can be called in atomic context.
506 */
507bool rfkill_is_epo_lock_active(void)
508{
509 return rfkill_epo_lock_active;
510}
511
512/**
513 * rfkill_get_global_sw_state - returns global state for a type
514 * @type: the type to get the global state of
515 *
516 * Returns the current global state for a given wireless
517 * device type.
518 */
519bool rfkill_get_global_sw_state(const enum rfkill_type type)
520{
521 return rfkill_global_states[type].cur;
522}
523#endif
524
525bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
526{
527 unsigned long flags;
528 bool ret, prev;
529
530 BUG_ON(!rfkill);
531
532 spin_lock_irqsave(&rfkill->lock, flags);
533 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
534 if (blocked)
535 rfkill->state |= RFKILL_BLOCK_HW;
536 else
537 rfkill->state &= ~RFKILL_BLOCK_HW;
538 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
539 spin_unlock_irqrestore(&rfkill->lock, flags);
540
541 rfkill_led_trigger_event(rfkill);
542 rfkill_global_led_trigger_event();
543
544 if (rfkill->registered && prev != blocked)
545 schedule_work(&rfkill->uevent_work);
546
547 return ret;
548}
549EXPORT_SYMBOL(rfkill_set_hw_state);
550
551static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
552{
553 u32 bit = RFKILL_BLOCK_SW;
554
555 /* if in a ops->set_block right now, use other bit */
556 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
557 bit = RFKILL_BLOCK_SW_PREV;
558
559 if (blocked)
560 rfkill->state |= bit;
561 else
562 rfkill->state &= ~bit;
563}
564
565bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
566{
567 unsigned long flags;
568 bool prev, hwblock;
569
570 BUG_ON(!rfkill);
571
572 spin_lock_irqsave(&rfkill->lock, flags);
573 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
574 __rfkill_set_sw_state(rfkill, blocked);
575 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
576 blocked = blocked || hwblock;
577 spin_unlock_irqrestore(&rfkill->lock, flags);
578
579 if (!rfkill->registered)
580 return blocked;
581
582 if (prev != blocked && !hwblock)
583 schedule_work(&rfkill->uevent_work);
584
585 rfkill_led_trigger_event(rfkill);
586 rfkill_global_led_trigger_event();
587
588 return blocked;
589}
590EXPORT_SYMBOL(rfkill_set_sw_state);
591
592void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
593{
594 unsigned long flags;
595
596 BUG_ON(!rfkill);
597 BUG_ON(rfkill->registered);
598
599 spin_lock_irqsave(&rfkill->lock, flags);
600 __rfkill_set_sw_state(rfkill, blocked);
601 rfkill->persistent = true;
602 spin_unlock_irqrestore(&rfkill->lock, flags);
603}
604EXPORT_SYMBOL(rfkill_init_sw_state);
605
606void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
607{
608 unsigned long flags;
609 bool swprev, hwprev;
610
611 BUG_ON(!rfkill);
612
613 spin_lock_irqsave(&rfkill->lock, flags);
614
615 /*
616 * No need to care about prev/setblock ... this is for uevent only
617 * and that will get triggered by rfkill_set_block anyway.
618 */
619 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
620 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
621 __rfkill_set_sw_state(rfkill, sw);
622 if (hw)
623 rfkill->state |= RFKILL_BLOCK_HW;
624 else
625 rfkill->state &= ~RFKILL_BLOCK_HW;
626
627 spin_unlock_irqrestore(&rfkill->lock, flags);
628
629 if (!rfkill->registered) {
630 rfkill->persistent = true;
631 } else {
632 if (swprev != sw || hwprev != hw)
633 schedule_work(&rfkill->uevent_work);
634
635 rfkill_led_trigger_event(rfkill);
636 rfkill_global_led_trigger_event();
637 }
638}
639EXPORT_SYMBOL(rfkill_set_states);
640
641static const char * const rfkill_types[] = {
642 NULL, /* RFKILL_TYPE_ALL */
643 "wlan",
644 "bluetooth",
645 "ultrawideband",
646 "wimax",
647 "wwan",
648 "gps",
649 "fm",
650 "nfc",
651};
652
653enum rfkill_type rfkill_find_type(const char *name)
654{
655 int i;
656
657 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
658
659 if (!name)
660 return RFKILL_TYPE_ALL;
661
662 for (i = 1; i < NUM_RFKILL_TYPES; i++)
663 if (!strcmp(name, rfkill_types[i]))
664 return i;
665 return RFKILL_TYPE_ALL;
666}
667EXPORT_SYMBOL(rfkill_find_type);
668
669static ssize_t name_show(struct device *dev, struct device_attribute *attr,
670 char *buf)
671{
672 struct rfkill *rfkill = to_rfkill(dev);
673
674 return sprintf(buf, "%s\n", rfkill->name);
675}
676static DEVICE_ATTR_RO(name);
677
678static ssize_t type_show(struct device *dev, struct device_attribute *attr,
679 char *buf)
680{
681 struct rfkill *rfkill = to_rfkill(dev);
682
683 return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
684}
685static DEVICE_ATTR_RO(type);
686
687static ssize_t index_show(struct device *dev, struct device_attribute *attr,
688 char *buf)
689{
690 struct rfkill *rfkill = to_rfkill(dev);
691
692 return sprintf(buf, "%d\n", rfkill->idx);
693}
694static DEVICE_ATTR_RO(index);
695
696static ssize_t persistent_show(struct device *dev,
697 struct device_attribute *attr, char *buf)
698{
699 struct rfkill *rfkill = to_rfkill(dev);
700
701 return sprintf(buf, "%d\n", rfkill->persistent);
702}
703static DEVICE_ATTR_RO(persistent);
704
705static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
706 char *buf)
707{
708 struct rfkill *rfkill = to_rfkill(dev);
709
710 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
711}
712static DEVICE_ATTR_RO(hard);
713
714static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
715 char *buf)
716{
717 struct rfkill *rfkill = to_rfkill(dev);
718
719 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
720}
721
722static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
723 const char *buf, size_t count)
724{
725 struct rfkill *rfkill = to_rfkill(dev);
726 unsigned long state;
727 int err;
728
729 if (!capable(CAP_NET_ADMIN))
730 return -EPERM;
731
732 err = kstrtoul(buf, 0, &state);
733 if (err)
734 return err;
735
736 if (state > 1 )
737 return -EINVAL;
738
739 mutex_lock(&rfkill_global_mutex);
740 rfkill_set_block(rfkill, state);
741 mutex_unlock(&rfkill_global_mutex);
742
743 return count;
744}
745static DEVICE_ATTR_RW(soft);
746
747static u8 user_state_from_blocked(unsigned long state)
748{
749 if (state & RFKILL_BLOCK_HW)
750 return RFKILL_USER_STATE_HARD_BLOCKED;
751 if (state & RFKILL_BLOCK_SW)
752 return RFKILL_USER_STATE_SOFT_BLOCKED;
753
754 return RFKILL_USER_STATE_UNBLOCKED;
755}
756
757static ssize_t state_show(struct device *dev, struct device_attribute *attr,
758 char *buf)
759{
760 struct rfkill *rfkill = to_rfkill(dev);
761
762 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
763}
764
765static ssize_t state_store(struct device *dev, struct device_attribute *attr,
766 const char *buf, size_t count)
767{
768 struct rfkill *rfkill = to_rfkill(dev);
769 unsigned long state;
770 int err;
771
772 if (!capable(CAP_NET_ADMIN))
773 return -EPERM;
774
775 err = kstrtoul(buf, 0, &state);
776 if (err)
777 return err;
778
779 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
780 state != RFKILL_USER_STATE_UNBLOCKED)
781 return -EINVAL;
782
783 mutex_lock(&rfkill_global_mutex);
784 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
785 mutex_unlock(&rfkill_global_mutex);
786
787 return count;
788}
789static DEVICE_ATTR_RW(state);
790
791static struct attribute *rfkill_dev_attrs[] = {
792 &dev_attr_name.attr,
793 &dev_attr_type.attr,
794 &dev_attr_index.attr,
795 &dev_attr_persistent.attr,
796 &dev_attr_state.attr,
797 &dev_attr_soft.attr,
798 &dev_attr_hard.attr,
799 NULL,
800};
801ATTRIBUTE_GROUPS(rfkill_dev);
802
803static void rfkill_release(struct device *dev)
804{
805 struct rfkill *rfkill = to_rfkill(dev);
806
807 kfree(rfkill);
808}
809
810static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
811{
812 struct rfkill *rfkill = to_rfkill(dev);
813 unsigned long flags;
814 u32 state;
815 int error;
816
817 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
818 if (error)
819 return error;
820 error = add_uevent_var(env, "RFKILL_TYPE=%s",
821 rfkill_types[rfkill->type]);
822 if (error)
823 return error;
824 spin_lock_irqsave(&rfkill->lock, flags);
825 state = rfkill->state;
826 spin_unlock_irqrestore(&rfkill->lock, flags);
827 error = add_uevent_var(env, "RFKILL_STATE=%d",
828 user_state_from_blocked(state));
829 return error;
830}
831
832void rfkill_pause_polling(struct rfkill *rfkill)
833{
834 BUG_ON(!rfkill);
835
836 if (!rfkill->ops->poll)
837 return;
838
839 rfkill->polling_paused = true;
840 cancel_delayed_work_sync(&rfkill->poll_work);
841}
842EXPORT_SYMBOL(rfkill_pause_polling);
843
844void rfkill_resume_polling(struct rfkill *rfkill)
845{
846 BUG_ON(!rfkill);
847
848 if (!rfkill->ops->poll)
849 return;
850
851 rfkill->polling_paused = false;
852
853 if (rfkill->suspended)
854 return;
855
856 queue_delayed_work(system_power_efficient_wq,
857 &rfkill->poll_work, 0);
858}
859EXPORT_SYMBOL(rfkill_resume_polling);
860
861#ifdef CONFIG_PM_SLEEP
862static int rfkill_suspend(struct device *dev)
863{
864 struct rfkill *rfkill = to_rfkill(dev);
865
866 rfkill->suspended = true;
867 cancel_delayed_work_sync(&rfkill->poll_work);
868
869 return 0;
870}
871
872static int rfkill_resume(struct device *dev)
873{
874 struct rfkill *rfkill = to_rfkill(dev);
875 bool cur;
876
877 rfkill->suspended = false;
878
879 if (!rfkill->persistent) {
880 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
881 rfkill_set_block(rfkill, cur);
882 }
883
884 if (rfkill->ops->poll && !rfkill->polling_paused)
885 queue_delayed_work(system_power_efficient_wq,
886 &rfkill->poll_work, 0);
887
888 return 0;
889}
890
891static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
892#define RFKILL_PM_OPS (&rfkill_pm_ops)
893#else
894#define RFKILL_PM_OPS NULL
895#endif
896
897static struct class rfkill_class = {
898 .name = "rfkill",
899 .dev_release = rfkill_release,
900 .dev_groups = rfkill_dev_groups,
901 .dev_uevent = rfkill_dev_uevent,
902 .pm = RFKILL_PM_OPS,
903};
904
905bool rfkill_blocked(struct rfkill *rfkill)
906{
907 unsigned long flags;
908 u32 state;
909
910 spin_lock_irqsave(&rfkill->lock, flags);
911 state = rfkill->state;
912 spin_unlock_irqrestore(&rfkill->lock, flags);
913
914 return !!(state & RFKILL_BLOCK_ANY);
915}
916EXPORT_SYMBOL(rfkill_blocked);
917
918
919struct rfkill * __must_check rfkill_alloc(const char *name,
920 struct device *parent,
921 const enum rfkill_type type,
922 const struct rfkill_ops *ops,
923 void *ops_data)
924{
925 struct rfkill *rfkill;
926 struct device *dev;
927
928 if (WARN_ON(!ops))
929 return NULL;
930
931 if (WARN_ON(!ops->set_block))
932 return NULL;
933
934 if (WARN_ON(!name))
935 return NULL;
936
937 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
938 return NULL;
939
940 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
941 if (!rfkill)
942 return NULL;
943
944 spin_lock_init(&rfkill->lock);
945 INIT_LIST_HEAD(&rfkill->node);
946 rfkill->type = type;
947 strcpy(rfkill->name, name);
948 rfkill->ops = ops;
949 rfkill->data = ops_data;
950
951 dev = &rfkill->dev;
952 dev->class = &rfkill_class;
953 dev->parent = parent;
954 device_initialize(dev);
955
956 return rfkill;
957}
958EXPORT_SYMBOL(rfkill_alloc);
959
960static void rfkill_poll(struct work_struct *work)
961{
962 struct rfkill *rfkill;
963
964 rfkill = container_of(work, struct rfkill, poll_work.work);
965
966 /*
967 * Poll hardware state -- driver will use one of the
968 * rfkill_set{,_hw,_sw}_state functions and use its
969 * return value to update the current status.
970 */
971 rfkill->ops->poll(rfkill, rfkill->data);
972
973 queue_delayed_work(system_power_efficient_wq,
974 &rfkill->poll_work,
975 round_jiffies_relative(POLL_INTERVAL));
976}
977
978static void rfkill_uevent_work(struct work_struct *work)
979{
980 struct rfkill *rfkill;
981
982 rfkill = container_of(work, struct rfkill, uevent_work);
983
984 mutex_lock(&rfkill_global_mutex);
985 rfkill_event(rfkill);
986 mutex_unlock(&rfkill_global_mutex);
987}
988
989static void rfkill_sync_work(struct work_struct *work)
990{
991 struct rfkill *rfkill;
992 bool cur;
993
994 rfkill = container_of(work, struct rfkill, sync_work);
995
996 mutex_lock(&rfkill_global_mutex);
997 cur = rfkill_global_states[rfkill->type].cur;
998 rfkill_set_block(rfkill, cur);
999 mutex_unlock(&rfkill_global_mutex);
1000}
1001
1002int __must_check rfkill_register(struct rfkill *rfkill)
1003{
1004 static unsigned long rfkill_no;
1005 struct device *dev;
1006 int error;
1007
1008 if (!rfkill)
1009 return -EINVAL;
1010
1011 dev = &rfkill->dev;
1012
1013 mutex_lock(&rfkill_global_mutex);
1014
1015 if (rfkill->registered) {
1016 error = -EALREADY;
1017 goto unlock;
1018 }
1019
1020 rfkill->idx = rfkill_no;
1021 dev_set_name(dev, "rfkill%lu", rfkill_no);
1022 rfkill_no++;
1023
1024 list_add_tail(&rfkill->node, &rfkill_list);
1025
1026 error = device_add(dev);
1027 if (error)
1028 goto remove;
1029
1030 error = rfkill_led_trigger_register(rfkill);
1031 if (error)
1032 goto devdel;
1033
1034 rfkill->registered = true;
1035
1036 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1037 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1038 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1039
1040 if (rfkill->ops->poll)
1041 queue_delayed_work(system_power_efficient_wq,
1042 &rfkill->poll_work,
1043 round_jiffies_relative(POLL_INTERVAL));
1044
1045 if (!rfkill->persistent || rfkill_epo_lock_active) {
1046 schedule_work(&rfkill->sync_work);
1047 } else {
1048#ifdef CONFIG_RFKILL_INPUT
1049 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1050
1051 if (!atomic_read(&rfkill_input_disabled))
1052 __rfkill_switch_all(rfkill->type, soft_blocked);
1053#endif
1054 }
1055
1056 rfkill_global_led_trigger_event();
1057 rfkill_send_events(rfkill, RFKILL_OP_ADD);
1058
1059 mutex_unlock(&rfkill_global_mutex);
1060 return 0;
1061
1062 devdel:
1063 device_del(&rfkill->dev);
1064 remove:
1065 list_del_init(&rfkill->node);
1066 unlock:
1067 mutex_unlock(&rfkill_global_mutex);
1068 return error;
1069}
1070EXPORT_SYMBOL(rfkill_register);
1071
1072void rfkill_unregister(struct rfkill *rfkill)
1073{
1074 BUG_ON(!rfkill);
1075
1076 if (rfkill->ops->poll)
1077 cancel_delayed_work_sync(&rfkill->poll_work);
1078
1079 cancel_work_sync(&rfkill->uevent_work);
1080 cancel_work_sync(&rfkill->sync_work);
1081
1082 rfkill->registered = false;
1083
1084 device_del(&rfkill->dev);
1085
1086 mutex_lock(&rfkill_global_mutex);
1087 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1088 list_del_init(&rfkill->node);
1089 rfkill_global_led_trigger_event();
1090 mutex_unlock(&rfkill_global_mutex);
1091
1092 rfkill_led_trigger_unregister(rfkill);
1093}
1094EXPORT_SYMBOL(rfkill_unregister);
1095
1096void rfkill_destroy(struct rfkill *rfkill)
1097{
1098 if (rfkill)
1099 put_device(&rfkill->dev);
1100}
1101EXPORT_SYMBOL(rfkill_destroy);
1102
1103static int rfkill_fop_open(struct inode *inode, struct file *file)
1104{
1105 struct rfkill_data *data;
1106 struct rfkill *rfkill;
1107 struct rfkill_int_event *ev, *tmp;
1108
1109 data = kzalloc(sizeof(*data), GFP_KERNEL);
1110 if (!data)
1111 return -ENOMEM;
1112
1113 INIT_LIST_HEAD(&data->events);
1114 mutex_init(&data->mtx);
1115 init_waitqueue_head(&data->read_wait);
1116
1117 mutex_lock(&rfkill_global_mutex);
1118 mutex_lock(&data->mtx);
1119 /*
1120 * start getting events from elsewhere but hold mtx to get
1121 * startup events added first
1122 */
1123
1124 list_for_each_entry(rfkill, &rfkill_list, node) {
1125 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1126 if (!ev)
1127 goto free;
1128 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1129 list_add_tail(&ev->list, &data->events);
1130 }
1131 list_add(&data->list, &rfkill_fds);
1132 mutex_unlock(&data->mtx);
1133 mutex_unlock(&rfkill_global_mutex);
1134
1135 file->private_data = data;
1136
1137 return stream_open(inode, file);
1138
1139 free:
1140 mutex_unlock(&data->mtx);
1141 mutex_unlock(&rfkill_global_mutex);
1142 mutex_destroy(&data->mtx);
1143 list_for_each_entry_safe(ev, tmp, &data->events, list)
1144 kfree(ev);
1145 kfree(data);
1146 return -ENOMEM;
1147}
1148
1149static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1150{
1151 struct rfkill_data *data = file->private_data;
1152 __poll_t res = EPOLLOUT | EPOLLWRNORM;
1153
1154 poll_wait(file, &data->read_wait, wait);
1155
1156 mutex_lock(&data->mtx);
1157 if (!list_empty(&data->events))
1158 res = EPOLLIN | EPOLLRDNORM;
1159 mutex_unlock(&data->mtx);
1160
1161 return res;
1162}
1163
1164static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1165 size_t count, loff_t *pos)
1166{
1167 struct rfkill_data *data = file->private_data;
1168 struct rfkill_int_event *ev;
1169 unsigned long sz;
1170 int ret;
1171
1172 mutex_lock(&data->mtx);
1173
1174 while (list_empty(&data->events)) {
1175 if (file->f_flags & O_NONBLOCK) {
1176 ret = -EAGAIN;
1177 goto out;
1178 }
1179 mutex_unlock(&data->mtx);
1180 /* since we re-check and it just compares pointers,
1181 * using !list_empty() without locking isn't a problem
1182 */
1183 ret = wait_event_interruptible(data->read_wait,
1184 !list_empty(&data->events));
1185 mutex_lock(&data->mtx);
1186
1187 if (ret)
1188 goto out;
1189 }
1190
1191 ev = list_first_entry(&data->events, struct rfkill_int_event,
1192 list);
1193
1194 sz = min_t(unsigned long, sizeof(ev->ev), count);
1195 ret = sz;
1196 if (copy_to_user(buf, &ev->ev, sz))
1197 ret = -EFAULT;
1198
1199 list_del(&ev->list);
1200 kfree(ev);
1201 out:
1202 mutex_unlock(&data->mtx);
1203 return ret;
1204}
1205
1206static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1207 size_t count, loff_t *pos)
1208{
1209 struct rfkill *rfkill;
1210 struct rfkill_event ev;
1211 int ret;
1212
1213 /* we don't need the 'hard' variable but accept it */
1214 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1215 return -EINVAL;
1216
1217 /*
1218 * Copy as much data as we can accept into our 'ev' buffer,
1219 * but tell userspace how much we've copied so it can determine
1220 * our API version even in a write() call, if it cares.
1221 */
1222 count = min(count, sizeof(ev));
1223 if (copy_from_user(&ev, buf, count))
1224 return -EFAULT;
1225
1226 if (ev.type >= NUM_RFKILL_TYPES)
1227 return -EINVAL;
1228
1229 mutex_lock(&rfkill_global_mutex);
1230
1231 switch (ev.op) {
1232 case RFKILL_OP_CHANGE_ALL:
1233 rfkill_update_global_state(ev.type, ev.soft);
1234 list_for_each_entry(rfkill, &rfkill_list, node)
1235 if (rfkill->type == ev.type ||
1236 ev.type == RFKILL_TYPE_ALL)
1237 rfkill_set_block(rfkill, ev.soft);
1238 ret = 0;
1239 break;
1240 case RFKILL_OP_CHANGE:
1241 list_for_each_entry(rfkill, &rfkill_list, node)
1242 if (rfkill->idx == ev.idx &&
1243 (rfkill->type == ev.type ||
1244 ev.type == RFKILL_TYPE_ALL))
1245 rfkill_set_block(rfkill, ev.soft);
1246 ret = 0;
1247 break;
1248 default:
1249 ret = -EINVAL;
1250 break;
1251 }
1252
1253 mutex_unlock(&rfkill_global_mutex);
1254
1255 return ret ?: count;
1256}
1257
1258static int rfkill_fop_release(struct inode *inode, struct file *file)
1259{
1260 struct rfkill_data *data = file->private_data;
1261 struct rfkill_int_event *ev, *tmp;
1262
1263 mutex_lock(&rfkill_global_mutex);
1264 list_del(&data->list);
1265 mutex_unlock(&rfkill_global_mutex);
1266
1267 mutex_destroy(&data->mtx);
1268 list_for_each_entry_safe(ev, tmp, &data->events, list)
1269 kfree(ev);
1270
1271#ifdef CONFIG_RFKILL_INPUT
1272 if (data->input_handler)
1273 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1274 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1275#endif
1276
1277 kfree(data);
1278
1279 return 0;
1280}
1281
1282#ifdef CONFIG_RFKILL_INPUT
1283static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1284 unsigned long arg)
1285{
1286 struct rfkill_data *data = file->private_data;
1287
1288 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1289 return -ENOSYS;
1290
1291 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1292 return -ENOSYS;
1293
1294 mutex_lock(&data->mtx);
1295
1296 if (!data->input_handler) {
1297 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1298 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1299 data->input_handler = true;
1300 }
1301
1302 mutex_unlock(&data->mtx);
1303
1304 return 0;
1305}
1306#endif
1307
1308static const struct file_operations rfkill_fops = {
1309 .owner = THIS_MODULE,
1310 .open = rfkill_fop_open,
1311 .read = rfkill_fop_read,
1312 .write = rfkill_fop_write,
1313 .poll = rfkill_fop_poll,
1314 .release = rfkill_fop_release,
1315#ifdef CONFIG_RFKILL_INPUT
1316 .unlocked_ioctl = rfkill_fop_ioctl,
1317 .compat_ioctl = compat_ptr_ioctl,
1318#endif
1319 .llseek = no_llseek,
1320};
1321
1322#define RFKILL_NAME "rfkill"
1323
1324static struct miscdevice rfkill_miscdev = {
1325 .fops = &rfkill_fops,
1326 .name = RFKILL_NAME,
1327 .minor = RFKILL_MINOR,
1328};
1329
1330static int __init rfkill_init(void)
1331{
1332 int error;
1333
1334 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1335
1336 error = class_register(&rfkill_class);
1337 if (error)
1338 goto error_class;
1339
1340 error = misc_register(&rfkill_miscdev);
1341 if (error)
1342 goto error_misc;
1343
1344 error = rfkill_global_led_trigger_register();
1345 if (error)
1346 goto error_led_trigger;
1347
1348#ifdef CONFIG_RFKILL_INPUT
1349 error = rfkill_handler_init();
1350 if (error)
1351 goto error_input;
1352#endif
1353
1354 return 0;
1355
1356#ifdef CONFIG_RFKILL_INPUT
1357error_input:
1358 rfkill_global_led_trigger_unregister();
1359#endif
1360error_led_trigger:
1361 misc_deregister(&rfkill_miscdev);
1362error_misc:
1363 class_unregister(&rfkill_class);
1364error_class:
1365 return error;
1366}
1367subsys_initcall(rfkill_init);
1368
1369static void __exit rfkill_exit(void)
1370{
1371#ifdef CONFIG_RFKILL_INPUT
1372 rfkill_handler_exit();
1373#endif
1374 rfkill_global_led_trigger_unregister();
1375 misc_deregister(&rfkill_miscdev);
1376 class_unregister(&rfkill_class);
1377}
1378module_exit(rfkill_exit);
1379
1380MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1381MODULE_ALIAS("devname:" RFKILL_NAME);