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19d337df JB |
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> | |
c64fb016 JB |
31 | #include <linux/miscdevice.h> |
32 | #include <linux/wait.h> | |
33 | #include <linux/poll.h> | |
34 | #include <linux/fs.h> | |
19d337df JB |
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 | ||
48 | struct rfkill { | |
49 | spinlock_t lock; | |
50 | ||
51 | const char *name; | |
52 | enum rfkill_type type; | |
53 | ||
54 | unsigned long state; | |
55 | ||
c64fb016 JB |
56 | u32 idx; |
57 | ||
19d337df | 58 | bool registered; |
b3fa1329 | 59 | bool persistent; |
19d337df JB |
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 | ||
c64fb016 JB |
78 | struct rfkill_int_event { |
79 | struct list_head list; | |
80 | struct rfkill_event ev; | |
81 | }; | |
82 | ||
83 | struct 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 | }; | |
19d337df JB |
90 | |
91 | ||
92 | MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); | |
93 | MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); | |
94 | MODULE_DESCRIPTION("RF switch support"); | |
95 | MODULE_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 | */ | |
109 | static LIST_HEAD(rfkill_list); /* list of registered rf switches */ | |
110 | static DEFINE_MUTEX(rfkill_global_mutex); | |
c64fb016 | 111 | static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */ |
19d337df JB |
112 | |
113 | static unsigned int rfkill_default_state = 1; | |
114 | module_param_named(default_state, rfkill_default_state, uint, 0444); | |
115 | MODULE_PARM_DESC(default_state, | |
116 | "Default initial state for all radio types, 0 = radio off"); | |
117 | ||
118 | static struct { | |
b3fa1329 | 119 | bool cur, sav; |
19d337df JB |
120 | } rfkill_global_states[NUM_RFKILL_TYPES]; |
121 | ||
19d337df JB |
122 | static bool rfkill_epo_lock_active; |
123 | ||
124 | ||
125 | #ifdef CONFIG_RFKILL_LEDS | |
126 | static 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 | ||
141 | static 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 | ||
150 | const char *rfkill_get_led_trigger_name(struct rfkill *rfkill) | |
151 | { | |
152 | return rfkill->led_trigger.name; | |
153 | } | |
154 | EXPORT_SYMBOL(rfkill_get_led_trigger_name); | |
155 | ||
156 | void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name) | |
157 | { | |
158 | BUG_ON(!rfkill); | |
159 | ||
160 | rfkill->ledtrigname = name; | |
161 | } | |
162 | EXPORT_SYMBOL(rfkill_set_led_trigger_name); | |
163 | ||
164 | static 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 | ||
172 | static void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
173 | { | |
174 | led_trigger_unregister(&rfkill->led_trigger); | |
175 | } | |
176 | #else | |
177 | static void rfkill_led_trigger_event(struct rfkill *rfkill) | |
178 | { | |
179 | } | |
180 | ||
181 | static inline int rfkill_led_trigger_register(struct rfkill *rfkill) | |
182 | { | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
187 | { | |
188 | } | |
189 | #endif /* CONFIG_RFKILL_LEDS */ | |
190 | ||
c64fb016 JB |
191 | static 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 | ||
207 | static 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 | ||
224 | static void rfkill_event(struct rfkill *rfkill) | |
19d337df | 225 | { |
06d5caf4 | 226 | if (!rfkill->registered) |
19d337df JB |
227 | return; |
228 | ||
229 | kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); | |
c64fb016 JB |
230 | |
231 | /* also send event to /dev/rfkill */ | |
232 | rfkill_send_events(rfkill, RFKILL_OP_CHANGE); | |
19d337df JB |
233 | } |
234 | ||
235 | static 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 | */ | |
267 | static void rfkill_set_block(struct rfkill *rfkill, bool blocked) | |
268 | { | |
269 | unsigned long flags; | |
270 | int err; | |
271 | ||
7fa20a7f AJ |
272 | if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) |
273 | return; | |
274 | ||
19d337df JB |
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 | ||
19d337df JB |
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); | |
c64fb016 | 316 | rfkill_event(rfkill); |
19d337df JB |
317 | } |
318 | ||
c64fb016 JB |
319 | #ifdef CONFIG_RFKILL_INPUT |
320 | static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); | |
321 | ||
19d337df JB |
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 | */ | |
333 | static 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 | */ | |
356 | void rfkill_switch_all(enum rfkill_type type, bool blocked) | |
357 | { | |
c64fb016 JB |
358 | if (atomic_read(&rfkill_input_disabled)) |
359 | return; | |
360 | ||
19d337df JB |
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 | */ | |
378 | void rfkill_epo(void) | |
379 | { | |
380 | struct rfkill *rfkill; | |
381 | int i; | |
382 | ||
c64fb016 JB |
383 | if (atomic_read(&rfkill_input_disabled)) |
384 | return; | |
385 | ||
19d337df JB |
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++) { | |
b3fa1329 | 393 | rfkill_global_states[i].sav = rfkill_global_states[i].cur; |
19d337df JB |
394 | rfkill_global_states[i].cur = true; |
395 | } | |
c64fb016 | 396 | |
19d337df JB |
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 | */ | |
407 | void rfkill_restore_states(void) | |
408 | { | |
409 | int i; | |
410 | ||
c64fb016 JB |
411 | if (atomic_read(&rfkill_input_disabled)) |
412 | return; | |
413 | ||
19d337df JB |
414 | mutex_lock(&rfkill_global_mutex); |
415 | ||
416 | rfkill_epo_lock_active = false; | |
417 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 418 | __rfkill_switch_all(i, rfkill_global_states[i].sav); |
19d337df JB |
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 | */ | |
428 | void rfkill_remove_epo_lock(void) | |
429 | { | |
c64fb016 JB |
430 | if (atomic_read(&rfkill_input_disabled)) |
431 | return; | |
432 | ||
19d337df JB |
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 | */ | |
447 | bool 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 | */ | |
459 | bool rfkill_get_global_sw_state(const enum rfkill_type type) | |
460 | { | |
461 | return rfkill_global_states[type].cur; | |
462 | } | |
c64fb016 | 463 | #endif |
19d337df | 464 | |
19d337df JB |
465 | |
466 | bool 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 | } | |
480 | EXPORT_SYMBOL(rfkill_set_hw_state); | |
481 | ||
482 | static 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 | ||
496 | bool 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 | ||
06d5caf4 AJ |
510 | if (!rfkill->registered) |
511 | return blocked; | |
19d337df | 512 | |
06d5caf4 AJ |
513 | if (prev != blocked && !hwblock) |
514 | schedule_work(&rfkill->uevent_work); | |
515 | ||
516 | rfkill_led_trigger_event(rfkill); | |
19d337df JB |
517 | |
518 | return blocked; | |
519 | } | |
520 | EXPORT_SYMBOL(rfkill_set_sw_state); | |
521 | ||
06d5caf4 AJ |
522 | void 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 | } | |
534 | EXPORT_SYMBOL(rfkill_init_sw_state); | |
535 | ||
19d337df JB |
536 | void 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); | |
48ab3578 AJ |
552 | if (hw) |
553 | rfkill->state |= RFKILL_BLOCK_HW; | |
554 | else | |
555 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
19d337df JB |
556 | |
557 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
558 | ||
b3fa1329 AJ |
559 | if (!rfkill->registered) { |
560 | rfkill->persistent = true; | |
561 | } else { | |
562 | if (swprev != sw || hwprev != hw) | |
563 | schedule_work(&rfkill->uevent_work); | |
19d337df | 564 | |
b3fa1329 AJ |
565 | rfkill_led_trigger_event(rfkill); |
566 | } | |
19d337df JB |
567 | } |
568 | EXPORT_SYMBOL(rfkill_set_states); | |
569 | ||
570 | static ssize_t rfkill_name_show(struct device *dev, | |
571 | struct device_attribute *attr, | |
572 | char *buf) | |
573 | { | |
574 | struct rfkill *rfkill = to_rfkill(dev); | |
575 | ||
576 | return sprintf(buf, "%s\n", rfkill->name); | |
577 | } | |
578 | ||
579 | static const char *rfkill_get_type_str(enum rfkill_type type) | |
580 | { | |
581 | switch (type) { | |
582 | case RFKILL_TYPE_WLAN: | |
583 | return "wlan"; | |
584 | case RFKILL_TYPE_BLUETOOTH: | |
585 | return "bluetooth"; | |
586 | case RFKILL_TYPE_UWB: | |
587 | return "ultrawideband"; | |
588 | case RFKILL_TYPE_WIMAX: | |
589 | return "wimax"; | |
590 | case RFKILL_TYPE_WWAN: | |
591 | return "wwan"; | |
3ad20149 TW |
592 | case RFKILL_TYPE_GPS: |
593 | return "gps"; | |
19d337df JB |
594 | default: |
595 | BUG(); | |
596 | } | |
597 | ||
3ad20149 | 598 | BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_GPS + 1); |
19d337df JB |
599 | } |
600 | ||
601 | static ssize_t rfkill_type_show(struct device *dev, | |
602 | struct device_attribute *attr, | |
603 | char *buf) | |
604 | { | |
605 | struct rfkill *rfkill = to_rfkill(dev); | |
606 | ||
607 | return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type)); | |
608 | } | |
609 | ||
c64fb016 JB |
610 | static ssize_t rfkill_idx_show(struct device *dev, |
611 | struct device_attribute *attr, | |
612 | char *buf) | |
613 | { | |
614 | struct rfkill *rfkill = to_rfkill(dev); | |
615 | ||
616 | return sprintf(buf, "%d\n", rfkill->idx); | |
617 | } | |
618 | ||
464902e8 AJ |
619 | static ssize_t rfkill_persistent_show(struct device *dev, |
620 | struct device_attribute *attr, | |
621 | char *buf) | |
622 | { | |
623 | struct rfkill *rfkill = to_rfkill(dev); | |
624 | ||
625 | return sprintf(buf, "%d\n", rfkill->persistent); | |
626 | } | |
627 | ||
19d337df JB |
628 | static u8 user_state_from_blocked(unsigned long state) |
629 | { | |
630 | if (state & RFKILL_BLOCK_HW) | |
631 | return RFKILL_USER_STATE_HARD_BLOCKED; | |
632 | if (state & RFKILL_BLOCK_SW) | |
633 | return RFKILL_USER_STATE_SOFT_BLOCKED; | |
634 | ||
635 | return RFKILL_USER_STATE_UNBLOCKED; | |
636 | } | |
637 | ||
638 | static ssize_t rfkill_state_show(struct device *dev, | |
639 | struct device_attribute *attr, | |
640 | char *buf) | |
641 | { | |
642 | struct rfkill *rfkill = to_rfkill(dev); | |
643 | unsigned long flags; | |
644 | u32 state; | |
645 | ||
646 | spin_lock_irqsave(&rfkill->lock, flags); | |
647 | state = rfkill->state; | |
648 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
649 | ||
650 | return sprintf(buf, "%d\n", user_state_from_blocked(state)); | |
651 | } | |
652 | ||
653 | static ssize_t rfkill_state_store(struct device *dev, | |
654 | struct device_attribute *attr, | |
655 | const char *buf, size_t count) | |
656 | { | |
f54c1427 JB |
657 | struct rfkill *rfkill = to_rfkill(dev); |
658 | unsigned long state; | |
659 | int err; | |
660 | ||
661 | if (!capable(CAP_NET_ADMIN)) | |
662 | return -EPERM; | |
663 | ||
664 | err = strict_strtoul(buf, 0, &state); | |
665 | if (err) | |
666 | return err; | |
667 | ||
668 | if (state != RFKILL_USER_STATE_SOFT_BLOCKED && | |
669 | state != RFKILL_USER_STATE_UNBLOCKED) | |
670 | return -EINVAL; | |
671 | ||
672 | mutex_lock(&rfkill_global_mutex); | |
673 | rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); | |
674 | mutex_unlock(&rfkill_global_mutex); | |
19d337df | 675 | |
f54c1427 | 676 | return err ?: count; |
19d337df JB |
677 | } |
678 | ||
679 | static ssize_t rfkill_claim_show(struct device *dev, | |
680 | struct device_attribute *attr, | |
681 | char *buf) | |
682 | { | |
683 | return sprintf(buf, "%d\n", 0); | |
684 | } | |
685 | ||
686 | static ssize_t rfkill_claim_store(struct device *dev, | |
687 | struct device_attribute *attr, | |
688 | const char *buf, size_t count) | |
689 | { | |
690 | return -EOPNOTSUPP; | |
691 | } | |
692 | ||
693 | static struct device_attribute rfkill_dev_attrs[] = { | |
694 | __ATTR(name, S_IRUGO, rfkill_name_show, NULL), | |
695 | __ATTR(type, S_IRUGO, rfkill_type_show, NULL), | |
c64fb016 | 696 | __ATTR(index, S_IRUGO, rfkill_idx_show, NULL), |
464902e8 | 697 | __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL), |
19d337df JB |
698 | __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store), |
699 | __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), | |
700 | __ATTR_NULL | |
701 | }; | |
702 | ||
703 | static void rfkill_release(struct device *dev) | |
704 | { | |
705 | struct rfkill *rfkill = to_rfkill(dev); | |
706 | ||
707 | kfree(rfkill); | |
708 | } | |
709 | ||
710 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
711 | { | |
712 | struct rfkill *rfkill = to_rfkill(dev); | |
713 | unsigned long flags; | |
714 | u32 state; | |
715 | int error; | |
716 | ||
717 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); | |
718 | if (error) | |
719 | return error; | |
720 | error = add_uevent_var(env, "RFKILL_TYPE=%s", | |
721 | rfkill_get_type_str(rfkill->type)); | |
722 | if (error) | |
723 | return error; | |
724 | spin_lock_irqsave(&rfkill->lock, flags); | |
725 | state = rfkill->state; | |
726 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
727 | error = add_uevent_var(env, "RFKILL_STATE=%d", | |
728 | user_state_from_blocked(state)); | |
729 | return error; | |
730 | } | |
731 | ||
732 | void rfkill_pause_polling(struct rfkill *rfkill) | |
733 | { | |
734 | BUG_ON(!rfkill); | |
735 | ||
736 | if (!rfkill->ops->poll) | |
737 | return; | |
738 | ||
739 | cancel_delayed_work_sync(&rfkill->poll_work); | |
740 | } | |
741 | EXPORT_SYMBOL(rfkill_pause_polling); | |
742 | ||
743 | void rfkill_resume_polling(struct rfkill *rfkill) | |
744 | { | |
745 | BUG_ON(!rfkill); | |
746 | ||
747 | if (!rfkill->ops->poll) | |
748 | return; | |
749 | ||
750 | schedule_work(&rfkill->poll_work.work); | |
751 | } | |
752 | EXPORT_SYMBOL(rfkill_resume_polling); | |
753 | ||
754 | static int rfkill_suspend(struct device *dev, pm_message_t state) | |
755 | { | |
756 | struct rfkill *rfkill = to_rfkill(dev); | |
757 | ||
758 | rfkill_pause_polling(rfkill); | |
759 | ||
19d337df JB |
760 | return 0; |
761 | } | |
762 | ||
763 | static int rfkill_resume(struct device *dev) | |
764 | { | |
765 | struct rfkill *rfkill = to_rfkill(dev); | |
766 | bool cur; | |
767 | ||
06d5caf4 AJ |
768 | if (!rfkill->persistent) { |
769 | cur = !!(rfkill->state & RFKILL_BLOCK_SW); | |
770 | rfkill_set_block(rfkill, cur); | |
771 | } | |
19d337df | 772 | |
19d337df JB |
773 | rfkill_resume_polling(rfkill); |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
778 | static struct class rfkill_class = { | |
779 | .name = "rfkill", | |
780 | .dev_release = rfkill_release, | |
781 | .dev_attrs = rfkill_dev_attrs, | |
782 | .dev_uevent = rfkill_dev_uevent, | |
783 | .suspend = rfkill_suspend, | |
784 | .resume = rfkill_resume, | |
785 | }; | |
786 | ||
6081162e JB |
787 | bool rfkill_blocked(struct rfkill *rfkill) |
788 | { | |
789 | unsigned long flags; | |
790 | u32 state; | |
791 | ||
792 | spin_lock_irqsave(&rfkill->lock, flags); | |
793 | state = rfkill->state; | |
794 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
795 | ||
796 | return !!(state & RFKILL_BLOCK_ANY); | |
797 | } | |
798 | EXPORT_SYMBOL(rfkill_blocked); | |
799 | ||
19d337df JB |
800 | |
801 | struct rfkill * __must_check rfkill_alloc(const char *name, | |
802 | struct device *parent, | |
803 | const enum rfkill_type type, | |
804 | const struct rfkill_ops *ops, | |
805 | void *ops_data) | |
806 | { | |
807 | struct rfkill *rfkill; | |
808 | struct device *dev; | |
809 | ||
810 | if (WARN_ON(!ops)) | |
811 | return NULL; | |
812 | ||
813 | if (WARN_ON(!ops->set_block)) | |
814 | return NULL; | |
815 | ||
816 | if (WARN_ON(!name)) | |
817 | return NULL; | |
818 | ||
c64fb016 | 819 | if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) |
19d337df JB |
820 | return NULL; |
821 | ||
822 | rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL); | |
823 | if (!rfkill) | |
824 | return NULL; | |
825 | ||
826 | spin_lock_init(&rfkill->lock); | |
827 | INIT_LIST_HEAD(&rfkill->node); | |
828 | rfkill->type = type; | |
829 | rfkill->name = name; | |
830 | rfkill->ops = ops; | |
831 | rfkill->data = ops_data; | |
832 | ||
833 | dev = &rfkill->dev; | |
834 | dev->class = &rfkill_class; | |
835 | dev->parent = parent; | |
836 | device_initialize(dev); | |
837 | ||
838 | return rfkill; | |
839 | } | |
840 | EXPORT_SYMBOL(rfkill_alloc); | |
841 | ||
842 | static void rfkill_poll(struct work_struct *work) | |
843 | { | |
844 | struct rfkill *rfkill; | |
845 | ||
846 | rfkill = container_of(work, struct rfkill, poll_work.work); | |
847 | ||
848 | /* | |
849 | * Poll hardware state -- driver will use one of the | |
850 | * rfkill_set{,_hw,_sw}_state functions and use its | |
851 | * return value to update the current status. | |
852 | */ | |
853 | rfkill->ops->poll(rfkill, rfkill->data); | |
854 | ||
855 | schedule_delayed_work(&rfkill->poll_work, | |
856 | round_jiffies_relative(POLL_INTERVAL)); | |
857 | } | |
858 | ||
859 | static void rfkill_uevent_work(struct work_struct *work) | |
860 | { | |
861 | struct rfkill *rfkill; | |
862 | ||
863 | rfkill = container_of(work, struct rfkill, uevent_work); | |
864 | ||
c64fb016 JB |
865 | mutex_lock(&rfkill_global_mutex); |
866 | rfkill_event(rfkill); | |
867 | mutex_unlock(&rfkill_global_mutex); | |
19d337df JB |
868 | } |
869 | ||
870 | static void rfkill_sync_work(struct work_struct *work) | |
871 | { | |
872 | struct rfkill *rfkill; | |
873 | bool cur; | |
874 | ||
875 | rfkill = container_of(work, struct rfkill, sync_work); | |
876 | ||
877 | mutex_lock(&rfkill_global_mutex); | |
878 | cur = rfkill_global_states[rfkill->type].cur; | |
879 | rfkill_set_block(rfkill, cur); | |
880 | mutex_unlock(&rfkill_global_mutex); | |
881 | } | |
882 | ||
883 | int __must_check rfkill_register(struct rfkill *rfkill) | |
884 | { | |
885 | static unsigned long rfkill_no; | |
886 | struct device *dev = &rfkill->dev; | |
887 | int error; | |
888 | ||
889 | BUG_ON(!rfkill); | |
890 | ||
891 | mutex_lock(&rfkill_global_mutex); | |
892 | ||
893 | if (rfkill->registered) { | |
894 | error = -EALREADY; | |
895 | goto unlock; | |
896 | } | |
897 | ||
c64fb016 | 898 | rfkill->idx = rfkill_no; |
19d337df JB |
899 | dev_set_name(dev, "rfkill%lu", rfkill_no); |
900 | rfkill_no++; | |
901 | ||
19d337df JB |
902 | list_add_tail(&rfkill->node, &rfkill_list); |
903 | ||
904 | error = device_add(dev); | |
905 | if (error) | |
906 | goto remove; | |
907 | ||
908 | error = rfkill_led_trigger_register(rfkill); | |
909 | if (error) | |
910 | goto devdel; | |
911 | ||
912 | rfkill->registered = true; | |
913 | ||
2ec2c68c | 914 | INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); |
19d337df | 915 | INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); |
19d337df | 916 | INIT_WORK(&rfkill->sync_work, rfkill_sync_work); |
2ec2c68c JB |
917 | |
918 | if (rfkill->ops->poll) | |
919 | schedule_delayed_work(&rfkill->poll_work, | |
920 | round_jiffies_relative(POLL_INTERVAL)); | |
b3fa1329 AJ |
921 | |
922 | if (!rfkill->persistent || rfkill_epo_lock_active) { | |
923 | schedule_work(&rfkill->sync_work); | |
924 | } else { | |
925 | #ifdef CONFIG_RFKILL_INPUT | |
926 | bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); | |
927 | ||
928 | if (!atomic_read(&rfkill_input_disabled)) | |
929 | __rfkill_switch_all(rfkill->type, soft_blocked); | |
930 | #endif | |
931 | } | |
2ec2c68c | 932 | |
c64fb016 | 933 | rfkill_send_events(rfkill, RFKILL_OP_ADD); |
19d337df JB |
934 | |
935 | mutex_unlock(&rfkill_global_mutex); | |
936 | return 0; | |
937 | ||
938 | devdel: | |
939 | device_del(&rfkill->dev); | |
940 | remove: | |
941 | list_del_init(&rfkill->node); | |
942 | unlock: | |
943 | mutex_unlock(&rfkill_global_mutex); | |
944 | return error; | |
945 | } | |
946 | EXPORT_SYMBOL(rfkill_register); | |
947 | ||
948 | void rfkill_unregister(struct rfkill *rfkill) | |
949 | { | |
950 | BUG_ON(!rfkill); | |
951 | ||
952 | if (rfkill->ops->poll) | |
953 | cancel_delayed_work_sync(&rfkill->poll_work); | |
954 | ||
955 | cancel_work_sync(&rfkill->uevent_work); | |
956 | cancel_work_sync(&rfkill->sync_work); | |
957 | ||
958 | rfkill->registered = false; | |
959 | ||
960 | device_del(&rfkill->dev); | |
961 | ||
962 | mutex_lock(&rfkill_global_mutex); | |
c64fb016 | 963 | rfkill_send_events(rfkill, RFKILL_OP_DEL); |
19d337df JB |
964 | list_del_init(&rfkill->node); |
965 | mutex_unlock(&rfkill_global_mutex); | |
966 | ||
967 | rfkill_led_trigger_unregister(rfkill); | |
968 | } | |
969 | EXPORT_SYMBOL(rfkill_unregister); | |
970 | ||
971 | void rfkill_destroy(struct rfkill *rfkill) | |
972 | { | |
973 | if (rfkill) | |
974 | put_device(&rfkill->dev); | |
975 | } | |
976 | EXPORT_SYMBOL(rfkill_destroy); | |
977 | ||
c64fb016 JB |
978 | static int rfkill_fop_open(struct inode *inode, struct file *file) |
979 | { | |
980 | struct rfkill_data *data; | |
981 | struct rfkill *rfkill; | |
982 | struct rfkill_int_event *ev, *tmp; | |
983 | ||
984 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
985 | if (!data) | |
986 | return -ENOMEM; | |
987 | ||
988 | INIT_LIST_HEAD(&data->events); | |
989 | mutex_init(&data->mtx); | |
990 | init_waitqueue_head(&data->read_wait); | |
991 | ||
992 | mutex_lock(&rfkill_global_mutex); | |
993 | mutex_lock(&data->mtx); | |
994 | /* | |
995 | * start getting events from elsewhere but hold mtx to get | |
996 | * startup events added first | |
997 | */ | |
998 | list_add(&data->list, &rfkill_fds); | |
999 | ||
1000 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1001 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
1002 | if (!ev) | |
1003 | goto free; | |
1004 | rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); | |
1005 | list_add_tail(&ev->list, &data->events); | |
1006 | } | |
1007 | mutex_unlock(&data->mtx); | |
1008 | mutex_unlock(&rfkill_global_mutex); | |
1009 | ||
1010 | file->private_data = data; | |
1011 | ||
1012 | return nonseekable_open(inode, file); | |
1013 | ||
1014 | free: | |
1015 | mutex_unlock(&data->mtx); | |
1016 | mutex_unlock(&rfkill_global_mutex); | |
1017 | mutex_destroy(&data->mtx); | |
1018 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1019 | kfree(ev); | |
1020 | kfree(data); | |
1021 | return -ENOMEM; | |
1022 | } | |
1023 | ||
1024 | static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait) | |
1025 | { | |
1026 | struct rfkill_data *data = file->private_data; | |
1027 | unsigned int res = POLLOUT | POLLWRNORM; | |
1028 | ||
1029 | poll_wait(file, &data->read_wait, wait); | |
1030 | ||
1031 | mutex_lock(&data->mtx); | |
1032 | if (!list_empty(&data->events)) | |
1033 | res = POLLIN | POLLRDNORM; | |
1034 | mutex_unlock(&data->mtx); | |
1035 | ||
1036 | return res; | |
1037 | } | |
1038 | ||
1039 | static bool rfkill_readable(struct rfkill_data *data) | |
1040 | { | |
1041 | bool r; | |
1042 | ||
1043 | mutex_lock(&data->mtx); | |
1044 | r = !list_empty(&data->events); | |
1045 | mutex_unlock(&data->mtx); | |
1046 | ||
1047 | return r; | |
1048 | } | |
1049 | ||
1050 | static ssize_t rfkill_fop_read(struct file *file, char __user *buf, | |
1051 | size_t count, loff_t *pos) | |
1052 | { | |
1053 | struct rfkill_data *data = file->private_data; | |
1054 | struct rfkill_int_event *ev; | |
1055 | unsigned long sz; | |
1056 | int ret; | |
1057 | ||
1058 | mutex_lock(&data->mtx); | |
1059 | ||
1060 | while (list_empty(&data->events)) { | |
1061 | if (file->f_flags & O_NONBLOCK) { | |
1062 | ret = -EAGAIN; | |
1063 | goto out; | |
1064 | } | |
1065 | mutex_unlock(&data->mtx); | |
1066 | ret = wait_event_interruptible(data->read_wait, | |
1067 | rfkill_readable(data)); | |
1068 | mutex_lock(&data->mtx); | |
1069 | ||
1070 | if (ret) | |
1071 | goto out; | |
1072 | } | |
1073 | ||
1074 | ev = list_first_entry(&data->events, struct rfkill_int_event, | |
1075 | list); | |
1076 | ||
1077 | sz = min_t(unsigned long, sizeof(ev->ev), count); | |
1078 | ret = sz; | |
1079 | if (copy_to_user(buf, &ev->ev, sz)) | |
1080 | ret = -EFAULT; | |
1081 | ||
1082 | list_del(&ev->list); | |
1083 | kfree(ev); | |
1084 | out: | |
1085 | mutex_unlock(&data->mtx); | |
1086 | return ret; | |
1087 | } | |
1088 | ||
1089 | static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, | |
1090 | size_t count, loff_t *pos) | |
1091 | { | |
1092 | struct rfkill *rfkill; | |
1093 | struct rfkill_event ev; | |
1094 | ||
1095 | /* we don't need the 'hard' variable but accept it */ | |
1be491fc | 1096 | if (count < RFKILL_EVENT_SIZE_V1 - 1) |
c64fb016 JB |
1097 | return -EINVAL; |
1098 | ||
1be491fc JB |
1099 | /* |
1100 | * Copy as much data as we can accept into our 'ev' buffer, | |
1101 | * but tell userspace how much we've copied so it can determine | |
1102 | * our API version even in a write() call, if it cares. | |
1103 | */ | |
1104 | count = min(count, sizeof(ev)); | |
1105 | if (copy_from_user(&ev, buf, count)) | |
c64fb016 JB |
1106 | return -EFAULT; |
1107 | ||
1108 | if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL) | |
1109 | return -EINVAL; | |
1110 | ||
1111 | if (ev.type >= NUM_RFKILL_TYPES) | |
1112 | return -EINVAL; | |
1113 | ||
1114 | mutex_lock(&rfkill_global_mutex); | |
1115 | ||
1116 | if (ev.op == RFKILL_OP_CHANGE_ALL) { | |
1117 | if (ev.type == RFKILL_TYPE_ALL) { | |
1118 | enum rfkill_type i; | |
1119 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
1120 | rfkill_global_states[i].cur = ev.soft; | |
1121 | } else { | |
1122 | rfkill_global_states[ev.type].cur = ev.soft; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1127 | if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL) | |
1128 | continue; | |
1129 | ||
1130 | if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL) | |
1131 | continue; | |
1132 | ||
1133 | rfkill_set_block(rfkill, ev.soft); | |
1134 | } | |
1135 | mutex_unlock(&rfkill_global_mutex); | |
1136 | ||
1137 | return count; | |
1138 | } | |
1139 | ||
1140 | static int rfkill_fop_release(struct inode *inode, struct file *file) | |
1141 | { | |
1142 | struct rfkill_data *data = file->private_data; | |
1143 | struct rfkill_int_event *ev, *tmp; | |
1144 | ||
1145 | mutex_lock(&rfkill_global_mutex); | |
1146 | list_del(&data->list); | |
1147 | mutex_unlock(&rfkill_global_mutex); | |
1148 | ||
1149 | mutex_destroy(&data->mtx); | |
1150 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1151 | kfree(ev); | |
1152 | ||
1153 | #ifdef CONFIG_RFKILL_INPUT | |
1154 | if (data->input_handler) | |
207ee162 JB |
1155 | if (atomic_dec_return(&rfkill_input_disabled) == 0) |
1156 | printk(KERN_DEBUG "rfkill: input handler enabled\n"); | |
c64fb016 JB |
1157 | #endif |
1158 | ||
1159 | kfree(data); | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | #ifdef CONFIG_RFKILL_INPUT | |
1165 | static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, | |
1166 | unsigned long arg) | |
1167 | { | |
1168 | struct rfkill_data *data = file->private_data; | |
1169 | ||
1170 | if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) | |
1171 | return -ENOSYS; | |
1172 | ||
1173 | if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) | |
1174 | return -ENOSYS; | |
1175 | ||
1176 | mutex_lock(&data->mtx); | |
1177 | ||
1178 | if (!data->input_handler) { | |
207ee162 JB |
1179 | if (atomic_inc_return(&rfkill_input_disabled) == 1) |
1180 | printk(KERN_DEBUG "rfkill: input handler disabled\n"); | |
c64fb016 JB |
1181 | data->input_handler = true; |
1182 | } | |
1183 | ||
1184 | mutex_unlock(&data->mtx); | |
1185 | ||
1186 | return 0; | |
1187 | } | |
1188 | #endif | |
1189 | ||
1190 | static const struct file_operations rfkill_fops = { | |
1191 | .open = rfkill_fop_open, | |
1192 | .read = rfkill_fop_read, | |
1193 | .write = rfkill_fop_write, | |
1194 | .poll = rfkill_fop_poll, | |
1195 | .release = rfkill_fop_release, | |
1196 | #ifdef CONFIG_RFKILL_INPUT | |
1197 | .unlocked_ioctl = rfkill_fop_ioctl, | |
1198 | .compat_ioctl = rfkill_fop_ioctl, | |
1199 | #endif | |
1200 | }; | |
1201 | ||
1202 | static struct miscdevice rfkill_miscdev = { | |
1203 | .name = "rfkill", | |
1204 | .fops = &rfkill_fops, | |
1205 | .minor = MISC_DYNAMIC_MINOR, | |
1206 | }; | |
19d337df JB |
1207 | |
1208 | static int __init rfkill_init(void) | |
1209 | { | |
1210 | int error; | |
1211 | int i; | |
1212 | ||
1213 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 1214 | rfkill_global_states[i].cur = !rfkill_default_state; |
19d337df JB |
1215 | |
1216 | error = class_register(&rfkill_class); | |
1217 | if (error) | |
1218 | goto out; | |
1219 | ||
c64fb016 JB |
1220 | error = misc_register(&rfkill_miscdev); |
1221 | if (error) { | |
1222 | class_unregister(&rfkill_class); | |
1223 | goto out; | |
1224 | } | |
1225 | ||
19d337df JB |
1226 | #ifdef CONFIG_RFKILL_INPUT |
1227 | error = rfkill_handler_init(); | |
c64fb016 JB |
1228 | if (error) { |
1229 | misc_deregister(&rfkill_miscdev); | |
19d337df | 1230 | class_unregister(&rfkill_class); |
c64fb016 JB |
1231 | goto out; |
1232 | } | |
19d337df JB |
1233 | #endif |
1234 | ||
1235 | out: | |
1236 | return error; | |
1237 | } | |
1238 | subsys_initcall(rfkill_init); | |
1239 | ||
1240 | static void __exit rfkill_exit(void) | |
1241 | { | |
1242 | #ifdef CONFIG_RFKILL_INPUT | |
1243 | rfkill_handler_exit(); | |
1244 | #endif | |
c64fb016 | 1245 | misc_deregister(&rfkill_miscdev); |
19d337df JB |
1246 | class_unregister(&rfkill_class); |
1247 | } | |
1248 | module_exit(rfkill_exit); |