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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/spinlock.h>
31#include <linux/miscdevice.h>
32#include <linux/wait.h>
33#include <linux/poll.h>
34#include <linux/fs.h>
35
36#include "rfkill.h"
37
38#define POLL_INTERVAL (5 * HZ)
39
40#define RFKILL_BLOCK_HW BIT(0)
41#define RFKILL_BLOCK_SW BIT(1)
42#define RFKILL_BLOCK_SW_PREV BIT(2)
43#define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
44 RFKILL_BLOCK_SW |\
45 RFKILL_BLOCK_SW_PREV)
46#define RFKILL_BLOCK_SW_SETCALL BIT(31)
47
48struct rfkill {
49 spinlock_t lock;
50
51 const char *name;
52 enum rfkill_type type;
53
54 unsigned long state;
55
56 u32 idx;
57
58 bool registered;
59 bool persistent;
60
61 const struct rfkill_ops *ops;
62 void *data;
63
64#ifdef CONFIG_RFKILL_LEDS
65 struct led_trigger led_trigger;
66 const char *ledtrigname;
67#endif
68
69 struct device dev;
70 struct list_head node;
71
72 struct delayed_work poll_work;
73 struct work_struct uevent_work;
74 struct work_struct sync_work;
75};
76#define to_rfkill(d) container_of(d, struct rfkill, dev)
77
78struct rfkill_int_event {
79 struct list_head list;
80 struct rfkill_event ev;
81};
82
83struct rfkill_data {
84 struct list_head list;
85 struct list_head events;
86 struct mutex mtx;
87 wait_queue_head_t read_wait;
88 bool input_handler;
89};
90
91
92MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
93MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
94MODULE_DESCRIPTION("RF switch support");
95MODULE_LICENSE("GPL");
96
97
98/*
99 * The locking here should be made much smarter, we currently have
100 * a bit of a stupid situation because drivers might want to register
101 * the rfkill struct under their own lock, and take this lock during
102 * rfkill method calls -- which will cause an AB-BA deadlock situation.
103 *
104 * To fix that, we need to rework this code here to be mostly lock-free
105 * and only use the mutex for list manipulations, not to protect the
106 * various other global variables. Then we can avoid holding the mutex
107 * around driver operations, and all is happy.
108 */
109static LIST_HEAD(rfkill_list); /* list of registered rf switches */
110static DEFINE_MUTEX(rfkill_global_mutex);
111static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
112
113static unsigned int rfkill_default_state = 1;
114module_param_named(default_state, rfkill_default_state, uint, 0444);
115MODULE_PARM_DESC(default_state,
116 "Default initial state for all radio types, 0 = radio off");
117
118static struct {
119 bool cur, sav;
120} rfkill_global_states[NUM_RFKILL_TYPES];
121
122static bool rfkill_epo_lock_active;
123
124
125#ifdef CONFIG_RFKILL_LEDS
126static void rfkill_led_trigger_event(struct rfkill *rfkill)
127{
128 struct led_trigger *trigger;
129
130 if (!rfkill->registered)
131 return;
132
133 trigger = &rfkill->led_trigger;
134
135 if (rfkill->state & RFKILL_BLOCK_ANY)
136 led_trigger_event(trigger, LED_OFF);
137 else
138 led_trigger_event(trigger, LED_FULL);
139}
140
141static void rfkill_led_trigger_activate(struct led_classdev *led)
142{
143 struct rfkill *rfkill;
144
145 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
146
147 rfkill_led_trigger_event(rfkill);
148}
149
150const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
151{
152 return rfkill->led_trigger.name;
153}
154EXPORT_SYMBOL(rfkill_get_led_trigger_name);
155
156void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
157{
158 BUG_ON(!rfkill);
159
160 rfkill->ledtrigname = name;
161}
162EXPORT_SYMBOL(rfkill_set_led_trigger_name);
163
164static int rfkill_led_trigger_register(struct rfkill *rfkill)
165{
166 rfkill->led_trigger.name = rfkill->ledtrigname
167 ? : dev_name(&rfkill->dev);
168 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
169 return led_trigger_register(&rfkill->led_trigger);
170}
171
172static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
173{
174 led_trigger_unregister(&rfkill->led_trigger);
175}
176#else
177static void rfkill_led_trigger_event(struct rfkill *rfkill)
178{
179}
180
181static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
182{
183 return 0;
184}
185
186static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
187{
188}
189#endif /* CONFIG_RFKILL_LEDS */
190
191static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
192 enum rfkill_operation op)
193{
194 unsigned long flags;
195
196 ev->idx = rfkill->idx;
197 ev->type = rfkill->type;
198 ev->op = op;
199
200 spin_lock_irqsave(&rfkill->lock, flags);
201 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
202 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
203 RFKILL_BLOCK_SW_PREV));
204 spin_unlock_irqrestore(&rfkill->lock, flags);
205}
206
207static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
208{
209 struct rfkill_data *data;
210 struct rfkill_int_event *ev;
211
212 list_for_each_entry(data, &rfkill_fds, list) {
213 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
214 if (!ev)
215 continue;
216 rfkill_fill_event(&ev->ev, rfkill, op);
217 mutex_lock(&data->mtx);
218 list_add_tail(&ev->list, &data->events);
219 mutex_unlock(&data->mtx);
220 wake_up_interruptible(&data->read_wait);
221 }
222}
223
224static void rfkill_event(struct rfkill *rfkill)
225{
226 if (!rfkill->registered)
227 return;
228
229 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
230
231 /* also send event to /dev/rfkill */
232 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
233}
234
235static bool __rfkill_set_hw_state(struct rfkill *rfkill,
236 bool blocked, bool *change)
237{
238 unsigned long flags;
239 bool prev, any;
240
241 BUG_ON(!rfkill);
242
243 spin_lock_irqsave(&rfkill->lock, flags);
244 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
245 if (blocked)
246 rfkill->state |= RFKILL_BLOCK_HW;
247 else
248 rfkill->state &= ~RFKILL_BLOCK_HW;
249 *change = prev != blocked;
250 any = rfkill->state & RFKILL_BLOCK_ANY;
251 spin_unlock_irqrestore(&rfkill->lock, flags);
252
253 rfkill_led_trigger_event(rfkill);
254
255 return any;
256}
257
258/**
259 * rfkill_set_block - wrapper for set_block method
260 *
261 * @rfkill: the rfkill struct to use
262 * @blocked: the new software state
263 *
264 * Calls the set_block method (when applicable) and handles notifications
265 * etc. as well.
266 */
267static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
268{
269 unsigned long flags;
270 int err;
271
272 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
273 return;
274
275 /*
276 * Some platforms (...!) generate input events which affect the
277 * _hard_ kill state -- whenever something tries to change the
278 * current software state query the hardware state too.
279 */
280 if (rfkill->ops->query)
281 rfkill->ops->query(rfkill, rfkill->data);
282
283 spin_lock_irqsave(&rfkill->lock, flags);
284 if (rfkill->state & RFKILL_BLOCK_SW)
285 rfkill->state |= RFKILL_BLOCK_SW_PREV;
286 else
287 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
288
289 if (blocked)
290 rfkill->state |= RFKILL_BLOCK_SW;
291 else
292 rfkill->state &= ~RFKILL_BLOCK_SW;
293
294 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
295 spin_unlock_irqrestore(&rfkill->lock, flags);
296
297 err = rfkill->ops->set_block(rfkill->data, blocked);
298
299 spin_lock_irqsave(&rfkill->lock, flags);
300 if (err) {
301 /*
302 * Failed -- reset status to _prev, this may be different
303 * from what set set _PREV to earlier in this function
304 * if rfkill_set_sw_state was invoked.
305 */
306 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
307 rfkill->state |= RFKILL_BLOCK_SW;
308 else
309 rfkill->state &= ~RFKILL_BLOCK_SW;
310 }
311 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
312 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
313 spin_unlock_irqrestore(&rfkill->lock, flags);
314
315 rfkill_led_trigger_event(rfkill);
316 rfkill_event(rfkill);
317}
318
319#ifdef CONFIG_RFKILL_INPUT
320static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
321
322/**
323 * __rfkill_switch_all - Toggle state of all switches of given type
324 * @type: type of interfaces to be affected
325 * @state: the new state
326 *
327 * This function sets the state of all switches of given type,
328 * unless a specific switch is claimed by userspace (in which case,
329 * that switch is left alone) or suspended.
330 *
331 * Caller must have acquired rfkill_global_mutex.
332 */
333static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
334{
335 struct rfkill *rfkill;
336
337 rfkill_global_states[type].cur = blocked;
338 list_for_each_entry(rfkill, &rfkill_list, node) {
339 if (rfkill->type != type)
340 continue;
341
342 rfkill_set_block(rfkill, blocked);
343 }
344}
345
346/**
347 * rfkill_switch_all - Toggle state of all switches of given type
348 * @type: type of interfaces to be affected
349 * @state: the new state
350 *
351 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
352 * Please refer to __rfkill_switch_all() for details.
353 *
354 * Does nothing if the EPO lock is active.
355 */
356void rfkill_switch_all(enum rfkill_type type, bool blocked)
357{
358 if (atomic_read(&rfkill_input_disabled))
359 return;
360
361 mutex_lock(&rfkill_global_mutex);
362
363 if (!rfkill_epo_lock_active)
364 __rfkill_switch_all(type, blocked);
365
366 mutex_unlock(&rfkill_global_mutex);
367}
368
369/**
370 * rfkill_epo - emergency power off all transmitters
371 *
372 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
373 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
374 *
375 * The global state before the EPO is saved and can be restored later
376 * using rfkill_restore_states().
377 */
378void rfkill_epo(void)
379{
380 struct rfkill *rfkill;
381 int i;
382
383 if (atomic_read(&rfkill_input_disabled))
384 return;
385
386 mutex_lock(&rfkill_global_mutex);
387
388 rfkill_epo_lock_active = true;
389 list_for_each_entry(rfkill, &rfkill_list, node)
390 rfkill_set_block(rfkill, true);
391
392 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
393 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
394 rfkill_global_states[i].cur = true;
395 }
396
397 mutex_unlock(&rfkill_global_mutex);
398}
399
400/**
401 * rfkill_restore_states - restore global states
402 *
403 * Restore (and sync switches to) the global state from the
404 * states in rfkill_default_states. This can undo the effects of
405 * a call to rfkill_epo().
406 */
407void rfkill_restore_states(void)
408{
409 int i;
410
411 if (atomic_read(&rfkill_input_disabled))
412 return;
413
414 mutex_lock(&rfkill_global_mutex);
415
416 rfkill_epo_lock_active = false;
417 for (i = 0; i < NUM_RFKILL_TYPES; i++)
418 __rfkill_switch_all(i, rfkill_global_states[i].sav);
419 mutex_unlock(&rfkill_global_mutex);
420}
421
422/**
423 * rfkill_remove_epo_lock - unlock state changes
424 *
425 * Used by rfkill-input manually unlock state changes, when
426 * the EPO switch is deactivated.
427 */
428void rfkill_remove_epo_lock(void)
429{
430 if (atomic_read(&rfkill_input_disabled))
431 return;
432
433 mutex_lock(&rfkill_global_mutex);
434 rfkill_epo_lock_active = false;
435 mutex_unlock(&rfkill_global_mutex);
436}
437
438/**
439 * rfkill_is_epo_lock_active - returns true EPO is active
440 *
441 * Returns 0 (false) if there is NOT an active EPO contidion,
442 * and 1 (true) if there is an active EPO contition, which
443 * locks all radios in one of the BLOCKED states.
444 *
445 * Can be called in atomic context.
446 */
447bool rfkill_is_epo_lock_active(void)
448{
449 return rfkill_epo_lock_active;
450}
451
452/**
453 * rfkill_get_global_sw_state - returns global state for a type
454 * @type: the type to get the global state of
455 *
456 * Returns the current global state for a given wireless
457 * device type.
458 */
459bool rfkill_get_global_sw_state(const enum rfkill_type type)
460{
461 return rfkill_global_states[type].cur;
462}
463#endif
464
465
466bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
467{
468 bool ret, change;
469
470 ret = __rfkill_set_hw_state(rfkill, blocked, &change);
471
472 if (!rfkill->registered)
473 return ret;
474
475 if (change)
476 schedule_work(&rfkill->uevent_work);
477
478 return ret;
479}
480EXPORT_SYMBOL(rfkill_set_hw_state);
481
482static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
483{
484 u32 bit = RFKILL_BLOCK_SW;
485
486 /* if in a ops->set_block right now, use other bit */
487 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
488 bit = RFKILL_BLOCK_SW_PREV;
489
490 if (blocked)
491 rfkill->state |= bit;
492 else
493 rfkill->state &= ~bit;
494}
495
496bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
497{
498 unsigned long flags;
499 bool prev, hwblock;
500
501 BUG_ON(!rfkill);
502
503 spin_lock_irqsave(&rfkill->lock, flags);
504 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
505 __rfkill_set_sw_state(rfkill, blocked);
506 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
507 blocked = blocked || hwblock;
508 spin_unlock_irqrestore(&rfkill->lock, flags);
509
510 if (!rfkill->registered)
511 return blocked;
512
513 if (prev != blocked && !hwblock)
514 schedule_work(&rfkill->uevent_work);
515
516 rfkill_led_trigger_event(rfkill);
517
518 return blocked;
519}
520EXPORT_SYMBOL(rfkill_set_sw_state);
521
522void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
523{
524 unsigned long flags;
525
526 BUG_ON(!rfkill);
527 BUG_ON(rfkill->registered);
528
529 spin_lock_irqsave(&rfkill->lock, flags);
530 __rfkill_set_sw_state(rfkill, blocked);
531 rfkill->persistent = true;
532 spin_unlock_irqrestore(&rfkill->lock, flags);
533}
534EXPORT_SYMBOL(rfkill_init_sw_state);
535
536void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
537{
538 unsigned long flags;
539 bool swprev, hwprev;
540
541 BUG_ON(!rfkill);
542
543 spin_lock_irqsave(&rfkill->lock, flags);
544
545 /*
546 * No need to care about prev/setblock ... this is for uevent only
547 * and that will get triggered by rfkill_set_block anyway.
548 */
549 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
550 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
551 __rfkill_set_sw_state(rfkill, sw);
552
553 spin_unlock_irqrestore(&rfkill->lock, flags);
554
555 if (!rfkill->registered) {
556 rfkill->persistent = true;
557 } else {
558 if (swprev != sw || hwprev != hw)
559 schedule_work(&rfkill->uevent_work);
560
561 rfkill_led_trigger_event(rfkill);
562 }
563}
564EXPORT_SYMBOL(rfkill_set_states);
565
566static ssize_t rfkill_name_show(struct device *dev,
567 struct device_attribute *attr,
568 char *buf)
569{
570 struct rfkill *rfkill = to_rfkill(dev);
571
572 return sprintf(buf, "%s\n", rfkill->name);
573}
574
575static const char *rfkill_get_type_str(enum rfkill_type type)
576{
577 switch (type) {
578 case RFKILL_TYPE_WLAN:
579 return "wlan";
580 case RFKILL_TYPE_BLUETOOTH:
581 return "bluetooth";
582 case RFKILL_TYPE_UWB:
583 return "ultrawideband";
584 case RFKILL_TYPE_WIMAX:
585 return "wimax";
586 case RFKILL_TYPE_WWAN:
587 return "wwan";
588 default:
589 BUG();
590 }
591
592 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_WWAN + 1);
593}
594
595static ssize_t rfkill_type_show(struct device *dev,
596 struct device_attribute *attr,
597 char *buf)
598{
599 struct rfkill *rfkill = to_rfkill(dev);
600
601 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
602}
603
604static ssize_t rfkill_idx_show(struct device *dev,
605 struct device_attribute *attr,
606 char *buf)
607{
608 struct rfkill *rfkill = to_rfkill(dev);
609
610 return sprintf(buf, "%d\n", rfkill->idx);
611}
612
613static ssize_t rfkill_persistent_show(struct device *dev,
614 struct device_attribute *attr,
615 char *buf)
616{
617 struct rfkill *rfkill = to_rfkill(dev);
618
619 return sprintf(buf, "%d\n", rfkill->persistent);
620}
621
622static u8 user_state_from_blocked(unsigned long state)
623{
624 if (state & RFKILL_BLOCK_HW)
625 return RFKILL_USER_STATE_HARD_BLOCKED;
626 if (state & RFKILL_BLOCK_SW)
627 return RFKILL_USER_STATE_SOFT_BLOCKED;
628
629 return RFKILL_USER_STATE_UNBLOCKED;
630}
631
632static ssize_t rfkill_state_show(struct device *dev,
633 struct device_attribute *attr,
634 char *buf)
635{
636 struct rfkill *rfkill = to_rfkill(dev);
637 unsigned long flags;
638 u32 state;
639
640 spin_lock_irqsave(&rfkill->lock, flags);
641 state = rfkill->state;
642 spin_unlock_irqrestore(&rfkill->lock, flags);
643
644 return sprintf(buf, "%d\n", user_state_from_blocked(state));
645}
646
647static ssize_t rfkill_state_store(struct device *dev,
648 struct device_attribute *attr,
649 const char *buf, size_t count)
650{
651 /*
652 * The intention was that userspace can only take control over
653 * a given device when/if rfkill-input doesn't control it due
654 * to user_claim. Since user_claim is currently unsupported,
655 * we never support changing the state from userspace -- this
656 * can be implemented again later.
657 */
658
659 return -EPERM;
660}
661
662static ssize_t rfkill_claim_show(struct device *dev,
663 struct device_attribute *attr,
664 char *buf)
665{
666 return sprintf(buf, "%d\n", 0);
667}
668
669static ssize_t rfkill_claim_store(struct device *dev,
670 struct device_attribute *attr,
671 const char *buf, size_t count)
672{
673 return -EOPNOTSUPP;
674}
675
676static struct device_attribute rfkill_dev_attrs[] = {
677 __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
678 __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
679 __ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
680 __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
681 __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
682 __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
683 __ATTR_NULL
684};
685
686static void rfkill_release(struct device *dev)
687{
688 struct rfkill *rfkill = to_rfkill(dev);
689
690 kfree(rfkill);
691}
692
693static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
694{
695 struct rfkill *rfkill = to_rfkill(dev);
696 unsigned long flags;
697 u32 state;
698 int error;
699
700 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
701 if (error)
702 return error;
703 error = add_uevent_var(env, "RFKILL_TYPE=%s",
704 rfkill_get_type_str(rfkill->type));
705 if (error)
706 return error;
707 spin_lock_irqsave(&rfkill->lock, flags);
708 state = rfkill->state;
709 spin_unlock_irqrestore(&rfkill->lock, flags);
710 error = add_uevent_var(env, "RFKILL_STATE=%d",
711 user_state_from_blocked(state));
712 return error;
713}
714
715void rfkill_pause_polling(struct rfkill *rfkill)
716{
717 BUG_ON(!rfkill);
718
719 if (!rfkill->ops->poll)
720 return;
721
722 cancel_delayed_work_sync(&rfkill->poll_work);
723}
724EXPORT_SYMBOL(rfkill_pause_polling);
725
726void rfkill_resume_polling(struct rfkill *rfkill)
727{
728 BUG_ON(!rfkill);
729
730 if (!rfkill->ops->poll)
731 return;
732
733 schedule_work(&rfkill->poll_work.work);
734}
735EXPORT_SYMBOL(rfkill_resume_polling);
736
737static int rfkill_suspend(struct device *dev, pm_message_t state)
738{
739 struct rfkill *rfkill = to_rfkill(dev);
740
741 rfkill_pause_polling(rfkill);
742
743 return 0;
744}
745
746static int rfkill_resume(struct device *dev)
747{
748 struct rfkill *rfkill = to_rfkill(dev);
749 bool cur;
750
751 if (!rfkill->persistent) {
752 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
753 rfkill_set_block(rfkill, cur);
754 }
755
756 rfkill_resume_polling(rfkill);
757
758 return 0;
759}
760
761static struct class rfkill_class = {
762 .name = "rfkill",
763 .dev_release = rfkill_release,
764 .dev_attrs = rfkill_dev_attrs,
765 .dev_uevent = rfkill_dev_uevent,
766 .suspend = rfkill_suspend,
767 .resume = rfkill_resume,
768};
769
770bool rfkill_blocked(struct rfkill *rfkill)
771{
772 unsigned long flags;
773 u32 state;
774
775 spin_lock_irqsave(&rfkill->lock, flags);
776 state = rfkill->state;
777 spin_unlock_irqrestore(&rfkill->lock, flags);
778
779 return !!(state & RFKILL_BLOCK_ANY);
780}
781EXPORT_SYMBOL(rfkill_blocked);
782
783
784struct rfkill * __must_check rfkill_alloc(const char *name,
785 struct device *parent,
786 const enum rfkill_type type,
787 const struct rfkill_ops *ops,
788 void *ops_data)
789{
790 struct rfkill *rfkill;
791 struct device *dev;
792
793 if (WARN_ON(!ops))
794 return NULL;
795
796 if (WARN_ON(!ops->set_block))
797 return NULL;
798
799 if (WARN_ON(!name))
800 return NULL;
801
802 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
803 return NULL;
804
805 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
806 if (!rfkill)
807 return NULL;
808
809 spin_lock_init(&rfkill->lock);
810 INIT_LIST_HEAD(&rfkill->node);
811 rfkill->type = type;
812 rfkill->name = name;
813 rfkill->ops = ops;
814 rfkill->data = ops_data;
815
816 dev = &rfkill->dev;
817 dev->class = &rfkill_class;
818 dev->parent = parent;
819 device_initialize(dev);
820
821 return rfkill;
822}
823EXPORT_SYMBOL(rfkill_alloc);
824
825static void rfkill_poll(struct work_struct *work)
826{
827 struct rfkill *rfkill;
828
829 rfkill = container_of(work, struct rfkill, poll_work.work);
830
831 /*
832 * Poll hardware state -- driver will use one of the
833 * rfkill_set{,_hw,_sw}_state functions and use its
834 * return value to update the current status.
835 */
836 rfkill->ops->poll(rfkill, rfkill->data);
837
838 schedule_delayed_work(&rfkill->poll_work,
839 round_jiffies_relative(POLL_INTERVAL));
840}
841
842static void rfkill_uevent_work(struct work_struct *work)
843{
844 struct rfkill *rfkill;
845
846 rfkill = container_of(work, struct rfkill, uevent_work);
847
848 mutex_lock(&rfkill_global_mutex);
849 rfkill_event(rfkill);
850 mutex_unlock(&rfkill_global_mutex);
851}
852
853static void rfkill_sync_work(struct work_struct *work)
854{
855 struct rfkill *rfkill;
856 bool cur;
857
858 rfkill = container_of(work, struct rfkill, sync_work);
859
860 mutex_lock(&rfkill_global_mutex);
861 cur = rfkill_global_states[rfkill->type].cur;
862 rfkill_set_block(rfkill, cur);
863 mutex_unlock(&rfkill_global_mutex);
864}
865
866int __must_check rfkill_register(struct rfkill *rfkill)
867{
868 static unsigned long rfkill_no;
869 struct device *dev = &rfkill->dev;
870 int error;
871
872 BUG_ON(!rfkill);
873
874 mutex_lock(&rfkill_global_mutex);
875
876 if (rfkill->registered) {
877 error = -EALREADY;
878 goto unlock;
879 }
880
881 rfkill->idx = rfkill_no;
882 dev_set_name(dev, "rfkill%lu", rfkill_no);
883 rfkill_no++;
884
885 list_add_tail(&rfkill->node, &rfkill_list);
886
887 error = device_add(dev);
888 if (error)
889 goto remove;
890
891 error = rfkill_led_trigger_register(rfkill);
892 if (error)
893 goto devdel;
894
895 rfkill->registered = true;
896
897 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
898 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
899 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
900
901 if (rfkill->ops->poll)
902 schedule_delayed_work(&rfkill->poll_work,
903 round_jiffies_relative(POLL_INTERVAL));
904
905 if (!rfkill->persistent || rfkill_epo_lock_active) {
906 schedule_work(&rfkill->sync_work);
907 } else {
908#ifdef CONFIG_RFKILL_INPUT
909 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
910
911 if (!atomic_read(&rfkill_input_disabled))
912 __rfkill_switch_all(rfkill->type, soft_blocked);
913#endif
914 }
915
916 rfkill_send_events(rfkill, RFKILL_OP_ADD);
917
918 mutex_unlock(&rfkill_global_mutex);
919 return 0;
920
921 devdel:
922 device_del(&rfkill->dev);
923 remove:
924 list_del_init(&rfkill->node);
925 unlock:
926 mutex_unlock(&rfkill_global_mutex);
927 return error;
928}
929EXPORT_SYMBOL(rfkill_register);
930
931void rfkill_unregister(struct rfkill *rfkill)
932{
933 BUG_ON(!rfkill);
934
935 if (rfkill->ops->poll)
936 cancel_delayed_work_sync(&rfkill->poll_work);
937
938 cancel_work_sync(&rfkill->uevent_work);
939 cancel_work_sync(&rfkill->sync_work);
940
941 rfkill->registered = false;
942
943 device_del(&rfkill->dev);
944
945 mutex_lock(&rfkill_global_mutex);
946 rfkill_send_events(rfkill, RFKILL_OP_DEL);
947 list_del_init(&rfkill->node);
948 mutex_unlock(&rfkill_global_mutex);
949
950 rfkill_led_trigger_unregister(rfkill);
951}
952EXPORT_SYMBOL(rfkill_unregister);
953
954void rfkill_destroy(struct rfkill *rfkill)
955{
956 if (rfkill)
957 put_device(&rfkill->dev);
958}
959EXPORT_SYMBOL(rfkill_destroy);
960
961static int rfkill_fop_open(struct inode *inode, struct file *file)
962{
963 struct rfkill_data *data;
964 struct rfkill *rfkill;
965 struct rfkill_int_event *ev, *tmp;
966
967 data = kzalloc(sizeof(*data), GFP_KERNEL);
968 if (!data)
969 return -ENOMEM;
970
971 INIT_LIST_HEAD(&data->events);
972 mutex_init(&data->mtx);
973 init_waitqueue_head(&data->read_wait);
974
975 mutex_lock(&rfkill_global_mutex);
976 mutex_lock(&data->mtx);
977 /*
978 * start getting events from elsewhere but hold mtx to get
979 * startup events added first
980 */
981 list_add(&data->list, &rfkill_fds);
982
983 list_for_each_entry(rfkill, &rfkill_list, node) {
984 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
985 if (!ev)
986 goto free;
987 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
988 list_add_tail(&ev->list, &data->events);
989 }
990 mutex_unlock(&data->mtx);
991 mutex_unlock(&rfkill_global_mutex);
992
993 file->private_data = data;
994
995 return nonseekable_open(inode, file);
996
997 free:
998 mutex_unlock(&data->mtx);
999 mutex_unlock(&rfkill_global_mutex);
1000 mutex_destroy(&data->mtx);
1001 list_for_each_entry_safe(ev, tmp, &data->events, list)
1002 kfree(ev);
1003 kfree(data);
1004 return -ENOMEM;
1005}
1006
1007static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1008{
1009 struct rfkill_data *data = file->private_data;
1010 unsigned int res = POLLOUT | POLLWRNORM;
1011
1012 poll_wait(file, &data->read_wait, wait);
1013
1014 mutex_lock(&data->mtx);
1015 if (!list_empty(&data->events))
1016 res = POLLIN | POLLRDNORM;
1017 mutex_unlock(&data->mtx);
1018
1019 return res;
1020}
1021
1022static bool rfkill_readable(struct rfkill_data *data)
1023{
1024 bool r;
1025
1026 mutex_lock(&data->mtx);
1027 r = !list_empty(&data->events);
1028 mutex_unlock(&data->mtx);
1029
1030 return r;
1031}
1032
1033static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1034 size_t count, loff_t *pos)
1035{
1036 struct rfkill_data *data = file->private_data;
1037 struct rfkill_int_event *ev;
1038 unsigned long sz;
1039 int ret;
1040
1041 mutex_lock(&data->mtx);
1042
1043 while (list_empty(&data->events)) {
1044 if (file->f_flags & O_NONBLOCK) {
1045 ret = -EAGAIN;
1046 goto out;
1047 }
1048 mutex_unlock(&data->mtx);
1049 ret = wait_event_interruptible(data->read_wait,
1050 rfkill_readable(data));
1051 mutex_lock(&data->mtx);
1052
1053 if (ret)
1054 goto out;
1055 }
1056
1057 ev = list_first_entry(&data->events, struct rfkill_int_event,
1058 list);
1059
1060 sz = min_t(unsigned long, sizeof(ev->ev), count);
1061 ret = sz;
1062 if (copy_to_user(buf, &ev->ev, sz))
1063 ret = -EFAULT;
1064
1065 list_del(&ev->list);
1066 kfree(ev);
1067 out:
1068 mutex_unlock(&data->mtx);
1069 return ret;
1070}
1071
1072static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1073 size_t count, loff_t *pos)
1074{
1075 struct rfkill *rfkill;
1076 struct rfkill_event ev;
1077
1078 /* we don't need the 'hard' variable but accept it */
1079 if (count < sizeof(ev) - 1)
1080 return -EINVAL;
1081
1082 if (copy_from_user(&ev, buf, sizeof(ev) - 1))
1083 return -EFAULT;
1084
1085 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1086 return -EINVAL;
1087
1088 if (ev.type >= NUM_RFKILL_TYPES)
1089 return -EINVAL;
1090
1091 mutex_lock(&rfkill_global_mutex);
1092
1093 if (ev.op == RFKILL_OP_CHANGE_ALL) {
1094 if (ev.type == RFKILL_TYPE_ALL) {
1095 enum rfkill_type i;
1096 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1097 rfkill_global_states[i].cur = ev.soft;
1098 } else {
1099 rfkill_global_states[ev.type].cur = ev.soft;
1100 }
1101 }
1102
1103 list_for_each_entry(rfkill, &rfkill_list, node) {
1104 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1105 continue;
1106
1107 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1108 continue;
1109
1110 rfkill_set_block(rfkill, ev.soft);
1111 }
1112 mutex_unlock(&rfkill_global_mutex);
1113
1114 return count;
1115}
1116
1117static int rfkill_fop_release(struct inode *inode, struct file *file)
1118{
1119 struct rfkill_data *data = file->private_data;
1120 struct rfkill_int_event *ev, *tmp;
1121
1122 mutex_lock(&rfkill_global_mutex);
1123 list_del(&data->list);
1124 mutex_unlock(&rfkill_global_mutex);
1125
1126 mutex_destroy(&data->mtx);
1127 list_for_each_entry_safe(ev, tmp, &data->events, list)
1128 kfree(ev);
1129
1130#ifdef CONFIG_RFKILL_INPUT
1131 if (data->input_handler)
1132 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1133 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1134#endif
1135
1136 kfree(data);
1137
1138 return 0;
1139}
1140
1141#ifdef CONFIG_RFKILL_INPUT
1142static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1143 unsigned long arg)
1144{
1145 struct rfkill_data *data = file->private_data;
1146
1147 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1148 return -ENOSYS;
1149
1150 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1151 return -ENOSYS;
1152
1153 mutex_lock(&data->mtx);
1154
1155 if (!data->input_handler) {
1156 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1157 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1158 data->input_handler = true;
1159 }
1160
1161 mutex_unlock(&data->mtx);
1162
1163 return 0;
1164}
1165#endif
1166
1167static const struct file_operations rfkill_fops = {
1168 .open = rfkill_fop_open,
1169 .read = rfkill_fop_read,
1170 .write = rfkill_fop_write,
1171 .poll = rfkill_fop_poll,
1172 .release = rfkill_fop_release,
1173#ifdef CONFIG_RFKILL_INPUT
1174 .unlocked_ioctl = rfkill_fop_ioctl,
1175 .compat_ioctl = rfkill_fop_ioctl,
1176#endif
1177};
1178
1179static struct miscdevice rfkill_miscdev = {
1180 .name = "rfkill",
1181 .fops = &rfkill_fops,
1182 .minor = MISC_DYNAMIC_MINOR,
1183};
1184
1185static int __init rfkill_init(void)
1186{
1187 int error;
1188 int i;
1189
1190 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1191 rfkill_global_states[i].cur = !rfkill_default_state;
1192
1193 error = class_register(&rfkill_class);
1194 if (error)
1195 goto out;
1196
1197 error = misc_register(&rfkill_miscdev);
1198 if (error) {
1199 class_unregister(&rfkill_class);
1200 goto out;
1201 }
1202
1203#ifdef CONFIG_RFKILL_INPUT
1204 error = rfkill_handler_init();
1205 if (error) {
1206 misc_deregister(&rfkill_miscdev);
1207 class_unregister(&rfkill_class);
1208 goto out;
1209 }
1210#endif
1211
1212 out:
1213 return error;
1214}
1215subsys_initcall(rfkill_init);
1216
1217static void __exit rfkill_exit(void)
1218{
1219#ifdef CONFIG_RFKILL_INPUT
1220 rfkill_handler_exit();
1221#endif
1222 misc_deregister(&rfkill_miscdev);
1223 class_unregister(&rfkill_class);
1224}
1225module_exit(rfkill_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2025-06-03 12:17:50 -0400