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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 | |
8232f1f3 | 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
19d337df JB |
18 | */ |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/workqueue.h> | |
24 | #include <linux/capability.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/rfkill.h> | |
a99bbaf5 | 28 | #include <linux/sched.h> |
19d337df | 29 | #include <linux/spinlock.h> |
51990e82 | 30 | #include <linux/device.h> |
c64fb016 JB |
31 | #include <linux/miscdevice.h> |
32 | #include <linux/wait.h> | |
33 | #include <linux/poll.h> | |
34 | #include <linux/fs.h> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
19d337df JB |
36 | |
37 | #include "rfkill.h" | |
38 | ||
39 | #define POLL_INTERVAL (5 * HZ) | |
40 | ||
41 | #define RFKILL_BLOCK_HW BIT(0) | |
42 | #define RFKILL_BLOCK_SW BIT(1) | |
43 | #define RFKILL_BLOCK_SW_PREV BIT(2) | |
44 | #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\ | |
45 | RFKILL_BLOCK_SW |\ | |
46 | RFKILL_BLOCK_SW_PREV) | |
47 | #define RFKILL_BLOCK_SW_SETCALL BIT(31) | |
48 | ||
49 | struct rfkill { | |
50 | spinlock_t lock; | |
51 | ||
19d337df JB |
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; |
dd21dfc6 JB |
60 | bool polling_paused; |
61 | bool suspended; | |
19d337df JB |
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; | |
b7bb1100 | 77 | char name[]; |
19d337df JB |
78 | }; |
79 | #define to_rfkill(d) container_of(d, struct rfkill, dev) | |
80 | ||
c64fb016 JB |
81 | struct rfkill_int_event { |
82 | struct list_head list; | |
83 | struct rfkill_event ev; | |
84 | }; | |
85 | ||
86 | struct rfkill_data { | |
87 | struct list_head list; | |
88 | struct list_head events; | |
89 | struct mutex mtx; | |
90 | wait_queue_head_t read_wait; | |
91 | bool input_handler; | |
92 | }; | |
19d337df JB |
93 | |
94 | ||
95 | MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); | |
96 | MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); | |
97 | MODULE_DESCRIPTION("RF switch support"); | |
98 | MODULE_LICENSE("GPL"); | |
99 | ||
100 | ||
101 | /* | |
102 | * The locking here should be made much smarter, we currently have | |
103 | * a bit of a stupid situation because drivers might want to register | |
104 | * the rfkill struct under their own lock, and take this lock during | |
105 | * rfkill method calls -- which will cause an AB-BA deadlock situation. | |
106 | * | |
107 | * To fix that, we need to rework this code here to be mostly lock-free | |
108 | * and only use the mutex for list manipulations, not to protect the | |
109 | * various other global variables. Then we can avoid holding the mutex | |
110 | * around driver operations, and all is happy. | |
111 | */ | |
112 | static LIST_HEAD(rfkill_list); /* list of registered rf switches */ | |
113 | static DEFINE_MUTEX(rfkill_global_mutex); | |
c64fb016 | 114 | static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */ |
19d337df JB |
115 | |
116 | static unsigned int rfkill_default_state = 1; | |
117 | module_param_named(default_state, rfkill_default_state, uint, 0444); | |
118 | MODULE_PARM_DESC(default_state, | |
119 | "Default initial state for all radio types, 0 = radio off"); | |
120 | ||
121 | static struct { | |
b3fa1329 | 122 | bool cur, sav; |
19d337df JB |
123 | } rfkill_global_states[NUM_RFKILL_TYPES]; |
124 | ||
19d337df JB |
125 | static bool rfkill_epo_lock_active; |
126 | ||
127 | ||
128 | #ifdef CONFIG_RFKILL_LEDS | |
129 | static void rfkill_led_trigger_event(struct rfkill *rfkill) | |
130 | { | |
131 | struct led_trigger *trigger; | |
132 | ||
133 | if (!rfkill->registered) | |
134 | return; | |
135 | ||
136 | trigger = &rfkill->led_trigger; | |
137 | ||
138 | if (rfkill->state & RFKILL_BLOCK_ANY) | |
139 | led_trigger_event(trigger, LED_OFF); | |
140 | else | |
141 | led_trigger_event(trigger, LED_FULL); | |
142 | } | |
143 | ||
144 | static void rfkill_led_trigger_activate(struct led_classdev *led) | |
145 | { | |
146 | struct rfkill *rfkill; | |
147 | ||
148 | rfkill = container_of(led->trigger, struct rfkill, led_trigger); | |
149 | ||
150 | rfkill_led_trigger_event(rfkill); | |
151 | } | |
152 | ||
06d7de83 AK |
153 | const char *rfkill_get_led_trigger_name(struct rfkill *rfkill) |
154 | { | |
155 | return rfkill->led_trigger.name; | |
156 | } | |
157 | EXPORT_SYMBOL(rfkill_get_led_trigger_name); | |
158 | ||
159 | void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name) | |
160 | { | |
161 | BUG_ON(!rfkill); | |
162 | ||
163 | rfkill->ledtrigname = name; | |
164 | } | |
165 | EXPORT_SYMBOL(rfkill_set_led_trigger_name); | |
166 | ||
19d337df JB |
167 | static int rfkill_led_trigger_register(struct rfkill *rfkill) |
168 | { | |
169 | rfkill->led_trigger.name = rfkill->ledtrigname | |
170 | ? : dev_name(&rfkill->dev); | |
171 | rfkill->led_trigger.activate = rfkill_led_trigger_activate; | |
172 | return led_trigger_register(&rfkill->led_trigger); | |
173 | } | |
174 | ||
175 | static void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
176 | { | |
177 | led_trigger_unregister(&rfkill->led_trigger); | |
178 | } | |
179 | #else | |
180 | static void rfkill_led_trigger_event(struct rfkill *rfkill) | |
181 | { | |
182 | } | |
183 | ||
184 | static inline int rfkill_led_trigger_register(struct rfkill *rfkill) | |
185 | { | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
190 | { | |
191 | } | |
192 | #endif /* CONFIG_RFKILL_LEDS */ | |
193 | ||
c64fb016 JB |
194 | static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill, |
195 | enum rfkill_operation op) | |
196 | { | |
197 | unsigned long flags; | |
198 | ||
199 | ev->idx = rfkill->idx; | |
200 | ev->type = rfkill->type; | |
201 | ev->op = op; | |
202 | ||
203 | spin_lock_irqsave(&rfkill->lock, flags); | |
204 | ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW); | |
205 | ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW | | |
206 | RFKILL_BLOCK_SW_PREV)); | |
207 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
208 | } | |
209 | ||
210 | static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op) | |
211 | { | |
212 | struct rfkill_data *data; | |
213 | struct rfkill_int_event *ev; | |
214 | ||
215 | list_for_each_entry(data, &rfkill_fds, list) { | |
216 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
217 | if (!ev) | |
218 | continue; | |
219 | rfkill_fill_event(&ev->ev, rfkill, op); | |
220 | mutex_lock(&data->mtx); | |
221 | list_add_tail(&ev->list, &data->events); | |
222 | mutex_unlock(&data->mtx); | |
223 | wake_up_interruptible(&data->read_wait); | |
224 | } | |
225 | } | |
226 | ||
227 | static void rfkill_event(struct rfkill *rfkill) | |
19d337df | 228 | { |
06d5caf4 | 229 | if (!rfkill->registered) |
19d337df JB |
230 | return; |
231 | ||
232 | kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); | |
c64fb016 JB |
233 | |
234 | /* also send event to /dev/rfkill */ | |
235 | rfkill_send_events(rfkill, RFKILL_OP_CHANGE); | |
19d337df JB |
236 | } |
237 | ||
19d337df JB |
238 | /** |
239 | * rfkill_set_block - wrapper for set_block method | |
240 | * | |
241 | * @rfkill: the rfkill struct to use | |
242 | * @blocked: the new software state | |
243 | * | |
244 | * Calls the set_block method (when applicable) and handles notifications | |
245 | * etc. as well. | |
246 | */ | |
247 | static void rfkill_set_block(struct rfkill *rfkill, bool blocked) | |
248 | { | |
249 | unsigned long flags; | |
eab48345 | 250 | bool prev, curr; |
19d337df JB |
251 | int err; |
252 | ||
7fa20a7f AJ |
253 | if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) |
254 | return; | |
255 | ||
19d337df JB |
256 | /* |
257 | * Some platforms (...!) generate input events which affect the | |
258 | * _hard_ kill state -- whenever something tries to change the | |
259 | * current software state query the hardware state too. | |
260 | */ | |
261 | if (rfkill->ops->query) | |
262 | rfkill->ops->query(rfkill, rfkill->data); | |
263 | ||
264 | spin_lock_irqsave(&rfkill->lock, flags); | |
eab48345 VW |
265 | prev = rfkill->state & RFKILL_BLOCK_SW; |
266 | ||
f3e7fae2 | 267 | if (prev) |
19d337df JB |
268 | rfkill->state |= RFKILL_BLOCK_SW_PREV; |
269 | else | |
270 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
271 | ||
272 | if (blocked) | |
273 | rfkill->state |= RFKILL_BLOCK_SW; | |
274 | else | |
275 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
276 | ||
277 | rfkill->state |= RFKILL_BLOCK_SW_SETCALL; | |
278 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
279 | ||
19d337df JB |
280 | err = rfkill->ops->set_block(rfkill->data, blocked); |
281 | ||
282 | spin_lock_irqsave(&rfkill->lock, flags); | |
283 | if (err) { | |
284 | /* | |
3ff707d6 JPRV |
285 | * Failed -- reset status to _PREV, which may be different |
286 | * from what we have set _PREV to earlier in this function | |
19d337df JB |
287 | * if rfkill_set_sw_state was invoked. |
288 | */ | |
289 | if (rfkill->state & RFKILL_BLOCK_SW_PREV) | |
290 | rfkill->state |= RFKILL_BLOCK_SW; | |
291 | else | |
292 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
293 | } | |
294 | rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL; | |
295 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
eab48345 | 296 | curr = rfkill->state & RFKILL_BLOCK_SW; |
19d337df JB |
297 | spin_unlock_irqrestore(&rfkill->lock, flags); |
298 | ||
299 | rfkill_led_trigger_event(rfkill); | |
eab48345 VW |
300 | |
301 | if (prev != curr) | |
302 | rfkill_event(rfkill); | |
19d337df JB |
303 | } |
304 | ||
c64fb016 JB |
305 | #ifdef CONFIG_RFKILL_INPUT |
306 | static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); | |
307 | ||
19d337df JB |
308 | /** |
309 | * __rfkill_switch_all - Toggle state of all switches of given type | |
310 | * @type: type of interfaces to be affected | |
2f29fed3 | 311 | * @blocked: the new state |
19d337df JB |
312 | * |
313 | * This function sets the state of all switches of given type, | |
e2a35e89 | 314 | * unless a specific switch is suspended. |
19d337df JB |
315 | * |
316 | * Caller must have acquired rfkill_global_mutex. | |
317 | */ | |
318 | static void __rfkill_switch_all(const enum rfkill_type type, bool blocked) | |
319 | { | |
320 | struct rfkill *rfkill; | |
321 | ||
4c077893 JPRV |
322 | if (type == RFKILL_TYPE_ALL) { |
323 | int i; | |
324 | ||
325 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
326 | rfkill_global_states[i].cur = blocked; | |
327 | } else { | |
328 | rfkill_global_states[type].cur = blocked; | |
329 | } | |
330 | ||
19d337df | 331 | list_for_each_entry(rfkill, &rfkill_list, node) { |
27e49ca9 | 332 | if (rfkill->type != type && type != RFKILL_TYPE_ALL) |
19d337df JB |
333 | continue; |
334 | ||
335 | rfkill_set_block(rfkill, blocked); | |
336 | } | |
337 | } | |
338 | ||
339 | /** | |
340 | * rfkill_switch_all - Toggle state of all switches of given type | |
341 | * @type: type of interfaces to be affected | |
2f29fed3 | 342 | * @blocked: the new state |
19d337df JB |
343 | * |
344 | * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). | |
345 | * Please refer to __rfkill_switch_all() for details. | |
346 | * | |
347 | * Does nothing if the EPO lock is active. | |
348 | */ | |
349 | void rfkill_switch_all(enum rfkill_type type, bool blocked) | |
350 | { | |
c64fb016 JB |
351 | if (atomic_read(&rfkill_input_disabled)) |
352 | return; | |
353 | ||
19d337df JB |
354 | mutex_lock(&rfkill_global_mutex); |
355 | ||
356 | if (!rfkill_epo_lock_active) | |
357 | __rfkill_switch_all(type, blocked); | |
358 | ||
359 | mutex_unlock(&rfkill_global_mutex); | |
360 | } | |
361 | ||
362 | /** | |
363 | * rfkill_epo - emergency power off all transmitters | |
364 | * | |
365 | * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, | |
366 | * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. | |
367 | * | |
368 | * The global state before the EPO is saved and can be restored later | |
369 | * using rfkill_restore_states(). | |
370 | */ | |
371 | void rfkill_epo(void) | |
372 | { | |
373 | struct rfkill *rfkill; | |
374 | int i; | |
375 | ||
c64fb016 JB |
376 | if (atomic_read(&rfkill_input_disabled)) |
377 | return; | |
378 | ||
19d337df JB |
379 | mutex_lock(&rfkill_global_mutex); |
380 | ||
381 | rfkill_epo_lock_active = true; | |
382 | list_for_each_entry(rfkill, &rfkill_list, node) | |
383 | rfkill_set_block(rfkill, true); | |
384 | ||
385 | for (i = 0; i < NUM_RFKILL_TYPES; i++) { | |
b3fa1329 | 386 | rfkill_global_states[i].sav = rfkill_global_states[i].cur; |
19d337df JB |
387 | rfkill_global_states[i].cur = true; |
388 | } | |
c64fb016 | 389 | |
19d337df JB |
390 | mutex_unlock(&rfkill_global_mutex); |
391 | } | |
392 | ||
393 | /** | |
394 | * rfkill_restore_states - restore global states | |
395 | * | |
396 | * Restore (and sync switches to) the global state from the | |
397 | * states in rfkill_default_states. This can undo the effects of | |
398 | * a call to rfkill_epo(). | |
399 | */ | |
400 | void rfkill_restore_states(void) | |
401 | { | |
402 | int i; | |
403 | ||
c64fb016 JB |
404 | if (atomic_read(&rfkill_input_disabled)) |
405 | return; | |
406 | ||
19d337df JB |
407 | mutex_lock(&rfkill_global_mutex); |
408 | ||
409 | rfkill_epo_lock_active = false; | |
410 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 411 | __rfkill_switch_all(i, rfkill_global_states[i].sav); |
19d337df JB |
412 | mutex_unlock(&rfkill_global_mutex); |
413 | } | |
414 | ||
415 | /** | |
416 | * rfkill_remove_epo_lock - unlock state changes | |
417 | * | |
418 | * Used by rfkill-input manually unlock state changes, when | |
419 | * the EPO switch is deactivated. | |
420 | */ | |
421 | void rfkill_remove_epo_lock(void) | |
422 | { | |
c64fb016 JB |
423 | if (atomic_read(&rfkill_input_disabled)) |
424 | return; | |
425 | ||
19d337df JB |
426 | mutex_lock(&rfkill_global_mutex); |
427 | rfkill_epo_lock_active = false; | |
428 | mutex_unlock(&rfkill_global_mutex); | |
429 | } | |
430 | ||
431 | /** | |
432 | * rfkill_is_epo_lock_active - returns true EPO is active | |
433 | * | |
434 | * Returns 0 (false) if there is NOT an active EPO contidion, | |
435 | * and 1 (true) if there is an active EPO contition, which | |
436 | * locks all radios in one of the BLOCKED states. | |
437 | * | |
438 | * Can be called in atomic context. | |
439 | */ | |
440 | bool rfkill_is_epo_lock_active(void) | |
441 | { | |
442 | return rfkill_epo_lock_active; | |
443 | } | |
444 | ||
445 | /** | |
446 | * rfkill_get_global_sw_state - returns global state for a type | |
447 | * @type: the type to get the global state of | |
448 | * | |
449 | * Returns the current global state for a given wireless | |
450 | * device type. | |
451 | */ | |
452 | bool rfkill_get_global_sw_state(const enum rfkill_type type) | |
453 | { | |
454 | return rfkill_global_states[type].cur; | |
455 | } | |
c64fb016 | 456 | #endif |
19d337df | 457 | |
19d337df JB |
458 | bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked) |
459 | { | |
1926e260 JPRV |
460 | unsigned long flags; |
461 | bool ret, prev; | |
462 | ||
463 | BUG_ON(!rfkill); | |
464 | ||
465 | spin_lock_irqsave(&rfkill->lock, flags); | |
466 | prev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
467 | if (blocked) | |
468 | rfkill->state |= RFKILL_BLOCK_HW; | |
469 | else | |
470 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
471 | ret = !!(rfkill->state & RFKILL_BLOCK_ANY); | |
472 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
19d337df | 473 | |
1926e260 | 474 | rfkill_led_trigger_event(rfkill); |
19d337df JB |
475 | |
476 | if (!rfkill->registered) | |
477 | return ret; | |
478 | ||
1926e260 | 479 | if (prev != blocked) |
19d337df JB |
480 | schedule_work(&rfkill->uevent_work); |
481 | ||
482 | return ret; | |
483 | } | |
484 | EXPORT_SYMBOL(rfkill_set_hw_state); | |
485 | ||
486 | static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
487 | { | |
488 | u32 bit = RFKILL_BLOCK_SW; | |
489 | ||
490 | /* if in a ops->set_block right now, use other bit */ | |
491 | if (rfkill->state & RFKILL_BLOCK_SW_SETCALL) | |
492 | bit = RFKILL_BLOCK_SW_PREV; | |
493 | ||
494 | if (blocked) | |
495 | rfkill->state |= bit; | |
496 | else | |
497 | rfkill->state &= ~bit; | |
498 | } | |
499 | ||
500 | bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
501 | { | |
502 | unsigned long flags; | |
503 | bool prev, hwblock; | |
504 | ||
505 | BUG_ON(!rfkill); | |
506 | ||
507 | spin_lock_irqsave(&rfkill->lock, flags); | |
508 | prev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
509 | __rfkill_set_sw_state(rfkill, blocked); | |
510 | hwblock = !!(rfkill->state & RFKILL_BLOCK_HW); | |
511 | blocked = blocked || hwblock; | |
512 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
513 | ||
06d5caf4 AJ |
514 | if (!rfkill->registered) |
515 | return blocked; | |
19d337df | 516 | |
06d5caf4 AJ |
517 | if (prev != blocked && !hwblock) |
518 | schedule_work(&rfkill->uevent_work); | |
519 | ||
520 | rfkill_led_trigger_event(rfkill); | |
19d337df JB |
521 | |
522 | return blocked; | |
523 | } | |
524 | EXPORT_SYMBOL(rfkill_set_sw_state); | |
525 | ||
06d5caf4 AJ |
526 | void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked) |
527 | { | |
528 | unsigned long flags; | |
529 | ||
530 | BUG_ON(!rfkill); | |
531 | BUG_ON(rfkill->registered); | |
532 | ||
533 | spin_lock_irqsave(&rfkill->lock, flags); | |
534 | __rfkill_set_sw_state(rfkill, blocked); | |
535 | rfkill->persistent = true; | |
536 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
537 | } | |
538 | EXPORT_SYMBOL(rfkill_init_sw_state); | |
539 | ||
19d337df JB |
540 | void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw) |
541 | { | |
542 | unsigned long flags; | |
543 | bool swprev, hwprev; | |
544 | ||
545 | BUG_ON(!rfkill); | |
546 | ||
547 | spin_lock_irqsave(&rfkill->lock, flags); | |
548 | ||
549 | /* | |
550 | * No need to care about prev/setblock ... this is for uevent only | |
551 | * and that will get triggered by rfkill_set_block anyway. | |
552 | */ | |
553 | swprev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
554 | hwprev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
555 | __rfkill_set_sw_state(rfkill, sw); | |
48ab3578 AJ |
556 | if (hw) |
557 | rfkill->state |= RFKILL_BLOCK_HW; | |
558 | else | |
559 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
19d337df JB |
560 | |
561 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
562 | ||
b3fa1329 AJ |
563 | if (!rfkill->registered) { |
564 | rfkill->persistent = true; | |
565 | } else { | |
566 | if (swprev != sw || hwprev != hw) | |
567 | schedule_work(&rfkill->uevent_work); | |
19d337df | 568 | |
b3fa1329 AJ |
569 | rfkill_led_trigger_event(rfkill); |
570 | } | |
19d337df JB |
571 | } |
572 | EXPORT_SYMBOL(rfkill_set_states); | |
573 | ||
648b50dd HK |
574 | static const char * const rfkill_types[] = { |
575 | NULL, /* RFKILL_TYPE_ALL */ | |
576 | "wlan", | |
577 | "bluetooth", | |
578 | "ultrawideband", | |
579 | "wimax", | |
580 | "wwan", | |
581 | "gps", | |
582 | "fm", | |
583 | "nfc", | |
584 | }; | |
585 | ||
586 | enum rfkill_type rfkill_find_type(const char *name) | |
587 | { | |
588 | int i; | |
589 | ||
590 | BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES); | |
591 | ||
592 | if (!name) | |
593 | return RFKILL_TYPE_ALL; | |
594 | ||
595 | for (i = 1; i < NUM_RFKILL_TYPES; i++) | |
596 | if (!strcmp(name, rfkill_types[i])) | |
597 | return i; | |
598 | return RFKILL_TYPE_ALL; | |
599 | } | |
600 | EXPORT_SYMBOL(rfkill_find_type); | |
601 | ||
e49df67d GKH |
602 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
603 | char *buf) | |
19d337df JB |
604 | { |
605 | struct rfkill *rfkill = to_rfkill(dev); | |
606 | ||
607 | return sprintf(buf, "%s\n", rfkill->name); | |
608 | } | |
e49df67d | 609 | static DEVICE_ATTR_RO(name); |
19d337df | 610 | |
e49df67d GKH |
611 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
612 | char *buf) | |
19d337df JB |
613 | { |
614 | struct rfkill *rfkill = to_rfkill(dev); | |
615 | ||
648b50dd | 616 | return sprintf(buf, "%s\n", rfkill_types[rfkill->type]); |
19d337df | 617 | } |
e49df67d | 618 | static DEVICE_ATTR_RO(type); |
19d337df | 619 | |
e49df67d GKH |
620 | static ssize_t index_show(struct device *dev, struct device_attribute *attr, |
621 | char *buf) | |
c64fb016 JB |
622 | { |
623 | struct rfkill *rfkill = to_rfkill(dev); | |
624 | ||
625 | return sprintf(buf, "%d\n", rfkill->idx); | |
626 | } | |
e49df67d | 627 | static DEVICE_ATTR_RO(index); |
c64fb016 | 628 | |
e49df67d GKH |
629 | static ssize_t persistent_show(struct device *dev, |
630 | struct device_attribute *attr, char *buf) | |
464902e8 AJ |
631 | { |
632 | struct rfkill *rfkill = to_rfkill(dev); | |
633 | ||
634 | return sprintf(buf, "%d\n", rfkill->persistent); | |
635 | } | |
e49df67d | 636 | static DEVICE_ATTR_RO(persistent); |
464902e8 | 637 | |
e49df67d GKH |
638 | static ssize_t hard_show(struct device *dev, struct device_attribute *attr, |
639 | char *buf) | |
6c26361e | 640 | { |
641 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 642 | |
819bfecc | 643 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 ); |
6c26361e | 644 | } |
e49df67d | 645 | static DEVICE_ATTR_RO(hard); |
6c26361e | 646 | |
e49df67d GKH |
647 | static ssize_t soft_show(struct device *dev, struct device_attribute *attr, |
648 | char *buf) | |
6c26361e | 649 | { |
650 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 651 | |
819bfecc | 652 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 ); |
6c26361e | 653 | } |
654 | ||
e49df67d GKH |
655 | static ssize_t soft_store(struct device *dev, struct device_attribute *attr, |
656 | const char *buf, size_t count) | |
6c26361e | 657 | { |
658 | struct rfkill *rfkill = to_rfkill(dev); | |
659 | unsigned long state; | |
660 | int err; | |
661 | ||
662 | if (!capable(CAP_NET_ADMIN)) | |
663 | return -EPERM; | |
664 | ||
1bac92ca | 665 | err = kstrtoul(buf, 0, &state); |
6c26361e | 666 | if (err) |
667 | return err; | |
668 | ||
669 | if (state > 1 ) | |
670 | return -EINVAL; | |
671 | ||
672 | mutex_lock(&rfkill_global_mutex); | |
673 | rfkill_set_block(rfkill, state); | |
674 | mutex_unlock(&rfkill_global_mutex); | |
675 | ||
6f7c962c | 676 | return count; |
6c26361e | 677 | } |
e49df67d | 678 | static DEVICE_ATTR_RW(soft); |
6c26361e | 679 | |
19d337df JB |
680 | static u8 user_state_from_blocked(unsigned long state) |
681 | { | |
682 | if (state & RFKILL_BLOCK_HW) | |
683 | return RFKILL_USER_STATE_HARD_BLOCKED; | |
684 | if (state & RFKILL_BLOCK_SW) | |
685 | return RFKILL_USER_STATE_SOFT_BLOCKED; | |
686 | ||
687 | return RFKILL_USER_STATE_UNBLOCKED; | |
688 | } | |
689 | ||
e49df67d GKH |
690 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
691 | char *buf) | |
19d337df JB |
692 | { |
693 | struct rfkill *rfkill = to_rfkill(dev); | |
19d337df | 694 | |
819bfecc | 695 | return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state)); |
19d337df JB |
696 | } |
697 | ||
e49df67d GKH |
698 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
699 | const char *buf, size_t count) | |
19d337df | 700 | { |
f54c1427 JB |
701 | struct rfkill *rfkill = to_rfkill(dev); |
702 | unsigned long state; | |
703 | int err; | |
704 | ||
705 | if (!capable(CAP_NET_ADMIN)) | |
706 | return -EPERM; | |
707 | ||
1bac92ca | 708 | err = kstrtoul(buf, 0, &state); |
f54c1427 JB |
709 | if (err) |
710 | return err; | |
711 | ||
712 | if (state != RFKILL_USER_STATE_SOFT_BLOCKED && | |
713 | state != RFKILL_USER_STATE_UNBLOCKED) | |
714 | return -EINVAL; | |
715 | ||
716 | mutex_lock(&rfkill_global_mutex); | |
717 | rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); | |
718 | mutex_unlock(&rfkill_global_mutex); | |
19d337df | 719 | |
6f7c962c | 720 | return count; |
19d337df | 721 | } |
e49df67d | 722 | static DEVICE_ATTR_RW(state); |
19d337df | 723 | |
e49df67d GKH |
724 | static struct attribute *rfkill_dev_attrs[] = { |
725 | &dev_attr_name.attr, | |
726 | &dev_attr_type.attr, | |
727 | &dev_attr_index.attr, | |
728 | &dev_attr_persistent.attr, | |
729 | &dev_attr_state.attr, | |
e49df67d GKH |
730 | &dev_attr_soft.attr, |
731 | &dev_attr_hard.attr, | |
732 | NULL, | |
19d337df | 733 | }; |
e49df67d | 734 | ATTRIBUTE_GROUPS(rfkill_dev); |
19d337df JB |
735 | |
736 | static void rfkill_release(struct device *dev) | |
737 | { | |
738 | struct rfkill *rfkill = to_rfkill(dev); | |
739 | ||
740 | kfree(rfkill); | |
741 | } | |
742 | ||
743 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
744 | { | |
745 | struct rfkill *rfkill = to_rfkill(dev); | |
746 | unsigned long flags; | |
747 | u32 state; | |
748 | int error; | |
749 | ||
750 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); | |
751 | if (error) | |
752 | return error; | |
753 | error = add_uevent_var(env, "RFKILL_TYPE=%s", | |
648b50dd | 754 | rfkill_types[rfkill->type]); |
19d337df JB |
755 | if (error) |
756 | return error; | |
757 | spin_lock_irqsave(&rfkill->lock, flags); | |
758 | state = rfkill->state; | |
759 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
760 | error = add_uevent_var(env, "RFKILL_STATE=%d", | |
761 | user_state_from_blocked(state)); | |
762 | return error; | |
763 | } | |
764 | ||
765 | void rfkill_pause_polling(struct rfkill *rfkill) | |
766 | { | |
767 | BUG_ON(!rfkill); | |
768 | ||
769 | if (!rfkill->ops->poll) | |
770 | return; | |
771 | ||
dd21dfc6 | 772 | rfkill->polling_paused = true; |
19d337df JB |
773 | cancel_delayed_work_sync(&rfkill->poll_work); |
774 | } | |
775 | EXPORT_SYMBOL(rfkill_pause_polling); | |
776 | ||
777 | void rfkill_resume_polling(struct rfkill *rfkill) | |
778 | { | |
779 | BUG_ON(!rfkill); | |
780 | ||
781 | if (!rfkill->ops->poll) | |
782 | return; | |
783 | ||
dd21dfc6 JB |
784 | rfkill->polling_paused = false; |
785 | ||
786 | if (rfkill->suspended) | |
787 | return; | |
788 | ||
67235cbc SD |
789 | queue_delayed_work(system_power_efficient_wq, |
790 | &rfkill->poll_work, 0); | |
19d337df JB |
791 | } |
792 | EXPORT_SYMBOL(rfkill_resume_polling); | |
793 | ||
28f297a7 LPC |
794 | #ifdef CONFIG_PM_SLEEP |
795 | static int rfkill_suspend(struct device *dev) | |
19d337df JB |
796 | { |
797 | struct rfkill *rfkill = to_rfkill(dev); | |
798 | ||
dd21dfc6 JB |
799 | rfkill->suspended = true; |
800 | cancel_delayed_work_sync(&rfkill->poll_work); | |
19d337df | 801 | |
19d337df JB |
802 | return 0; |
803 | } | |
804 | ||
805 | static int rfkill_resume(struct device *dev) | |
806 | { | |
807 | struct rfkill *rfkill = to_rfkill(dev); | |
808 | bool cur; | |
809 | ||
dd21dfc6 JB |
810 | rfkill->suspended = false; |
811 | ||
06d5caf4 AJ |
812 | if (!rfkill->persistent) { |
813 | cur = !!(rfkill->state & RFKILL_BLOCK_SW); | |
814 | rfkill_set_block(rfkill, cur); | |
815 | } | |
19d337df | 816 | |
dd21dfc6 JB |
817 | if (rfkill->ops->poll && !rfkill->polling_paused) |
818 | queue_delayed_work(system_power_efficient_wq, | |
819 | &rfkill->poll_work, 0); | |
19d337df JB |
820 | |
821 | return 0; | |
822 | } | |
823 | ||
28f297a7 LPC |
824 | static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume); |
825 | #define RFKILL_PM_OPS (&rfkill_pm_ops) | |
826 | #else | |
827 | #define RFKILL_PM_OPS NULL | |
828 | #endif | |
829 | ||
19d337df JB |
830 | static struct class rfkill_class = { |
831 | .name = "rfkill", | |
832 | .dev_release = rfkill_release, | |
e49df67d | 833 | .dev_groups = rfkill_dev_groups, |
19d337df | 834 | .dev_uevent = rfkill_dev_uevent, |
28f297a7 | 835 | .pm = RFKILL_PM_OPS, |
19d337df JB |
836 | }; |
837 | ||
6081162e JB |
838 | bool rfkill_blocked(struct rfkill *rfkill) |
839 | { | |
840 | unsigned long flags; | |
841 | u32 state; | |
842 | ||
843 | spin_lock_irqsave(&rfkill->lock, flags); | |
844 | state = rfkill->state; | |
845 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
846 | ||
847 | return !!(state & RFKILL_BLOCK_ANY); | |
848 | } | |
849 | EXPORT_SYMBOL(rfkill_blocked); | |
850 | ||
19d337df JB |
851 | |
852 | struct rfkill * __must_check rfkill_alloc(const char *name, | |
853 | struct device *parent, | |
854 | const enum rfkill_type type, | |
855 | const struct rfkill_ops *ops, | |
856 | void *ops_data) | |
857 | { | |
858 | struct rfkill *rfkill; | |
859 | struct device *dev; | |
860 | ||
861 | if (WARN_ON(!ops)) | |
862 | return NULL; | |
863 | ||
864 | if (WARN_ON(!ops->set_block)) | |
865 | return NULL; | |
866 | ||
867 | if (WARN_ON(!name)) | |
868 | return NULL; | |
869 | ||
c64fb016 | 870 | if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) |
19d337df JB |
871 | return NULL; |
872 | ||
b7bb1100 | 873 | rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL); |
19d337df JB |
874 | if (!rfkill) |
875 | return NULL; | |
876 | ||
877 | spin_lock_init(&rfkill->lock); | |
878 | INIT_LIST_HEAD(&rfkill->node); | |
879 | rfkill->type = type; | |
b7bb1100 | 880 | strcpy(rfkill->name, name); |
19d337df JB |
881 | rfkill->ops = ops; |
882 | rfkill->data = ops_data; | |
883 | ||
884 | dev = &rfkill->dev; | |
885 | dev->class = &rfkill_class; | |
886 | dev->parent = parent; | |
887 | device_initialize(dev); | |
888 | ||
889 | return rfkill; | |
890 | } | |
891 | EXPORT_SYMBOL(rfkill_alloc); | |
892 | ||
893 | static void rfkill_poll(struct work_struct *work) | |
894 | { | |
895 | struct rfkill *rfkill; | |
896 | ||
897 | rfkill = container_of(work, struct rfkill, poll_work.work); | |
898 | ||
899 | /* | |
900 | * Poll hardware state -- driver will use one of the | |
901 | * rfkill_set{,_hw,_sw}_state functions and use its | |
902 | * return value to update the current status. | |
903 | */ | |
904 | rfkill->ops->poll(rfkill, rfkill->data); | |
905 | ||
67235cbc SD |
906 | queue_delayed_work(system_power_efficient_wq, |
907 | &rfkill->poll_work, | |
19d337df JB |
908 | round_jiffies_relative(POLL_INTERVAL)); |
909 | } | |
910 | ||
911 | static void rfkill_uevent_work(struct work_struct *work) | |
912 | { | |
913 | struct rfkill *rfkill; | |
914 | ||
915 | rfkill = container_of(work, struct rfkill, uevent_work); | |
916 | ||
c64fb016 JB |
917 | mutex_lock(&rfkill_global_mutex); |
918 | rfkill_event(rfkill); | |
919 | mutex_unlock(&rfkill_global_mutex); | |
19d337df JB |
920 | } |
921 | ||
922 | static void rfkill_sync_work(struct work_struct *work) | |
923 | { | |
924 | struct rfkill *rfkill; | |
925 | bool cur; | |
926 | ||
927 | rfkill = container_of(work, struct rfkill, sync_work); | |
928 | ||
929 | mutex_lock(&rfkill_global_mutex); | |
930 | cur = rfkill_global_states[rfkill->type].cur; | |
931 | rfkill_set_block(rfkill, cur); | |
932 | mutex_unlock(&rfkill_global_mutex); | |
933 | } | |
934 | ||
935 | int __must_check rfkill_register(struct rfkill *rfkill) | |
936 | { | |
937 | static unsigned long rfkill_no; | |
938 | struct device *dev = &rfkill->dev; | |
939 | int error; | |
940 | ||
941 | BUG_ON(!rfkill); | |
942 | ||
943 | mutex_lock(&rfkill_global_mutex); | |
944 | ||
945 | if (rfkill->registered) { | |
946 | error = -EALREADY; | |
947 | goto unlock; | |
948 | } | |
949 | ||
c64fb016 | 950 | rfkill->idx = rfkill_no; |
19d337df JB |
951 | dev_set_name(dev, "rfkill%lu", rfkill_no); |
952 | rfkill_no++; | |
953 | ||
19d337df JB |
954 | list_add_tail(&rfkill->node, &rfkill_list); |
955 | ||
956 | error = device_add(dev); | |
957 | if (error) | |
958 | goto remove; | |
959 | ||
960 | error = rfkill_led_trigger_register(rfkill); | |
961 | if (error) | |
962 | goto devdel; | |
963 | ||
964 | rfkill->registered = true; | |
965 | ||
2ec2c68c | 966 | INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); |
19d337df | 967 | INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); |
19d337df | 968 | INIT_WORK(&rfkill->sync_work, rfkill_sync_work); |
2ec2c68c JB |
969 | |
970 | if (rfkill->ops->poll) | |
67235cbc SD |
971 | queue_delayed_work(system_power_efficient_wq, |
972 | &rfkill->poll_work, | |
2ec2c68c | 973 | round_jiffies_relative(POLL_INTERVAL)); |
b3fa1329 AJ |
974 | |
975 | if (!rfkill->persistent || rfkill_epo_lock_active) { | |
976 | schedule_work(&rfkill->sync_work); | |
977 | } else { | |
978 | #ifdef CONFIG_RFKILL_INPUT | |
979 | bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); | |
980 | ||
981 | if (!atomic_read(&rfkill_input_disabled)) | |
982 | __rfkill_switch_all(rfkill->type, soft_blocked); | |
983 | #endif | |
984 | } | |
2ec2c68c | 985 | |
c64fb016 | 986 | rfkill_send_events(rfkill, RFKILL_OP_ADD); |
19d337df JB |
987 | |
988 | mutex_unlock(&rfkill_global_mutex); | |
989 | return 0; | |
990 | ||
991 | devdel: | |
992 | device_del(&rfkill->dev); | |
993 | remove: | |
994 | list_del_init(&rfkill->node); | |
995 | unlock: | |
996 | mutex_unlock(&rfkill_global_mutex); | |
997 | return error; | |
998 | } | |
999 | EXPORT_SYMBOL(rfkill_register); | |
1000 | ||
1001 | void rfkill_unregister(struct rfkill *rfkill) | |
1002 | { | |
1003 | BUG_ON(!rfkill); | |
1004 | ||
1005 | if (rfkill->ops->poll) | |
1006 | cancel_delayed_work_sync(&rfkill->poll_work); | |
1007 | ||
1008 | cancel_work_sync(&rfkill->uevent_work); | |
1009 | cancel_work_sync(&rfkill->sync_work); | |
1010 | ||
1011 | rfkill->registered = false; | |
1012 | ||
1013 | device_del(&rfkill->dev); | |
1014 | ||
1015 | mutex_lock(&rfkill_global_mutex); | |
c64fb016 | 1016 | rfkill_send_events(rfkill, RFKILL_OP_DEL); |
19d337df JB |
1017 | list_del_init(&rfkill->node); |
1018 | mutex_unlock(&rfkill_global_mutex); | |
1019 | ||
1020 | rfkill_led_trigger_unregister(rfkill); | |
1021 | } | |
1022 | EXPORT_SYMBOL(rfkill_unregister); | |
1023 | ||
1024 | void rfkill_destroy(struct rfkill *rfkill) | |
1025 | { | |
1026 | if (rfkill) | |
1027 | put_device(&rfkill->dev); | |
1028 | } | |
1029 | EXPORT_SYMBOL(rfkill_destroy); | |
1030 | ||
c64fb016 JB |
1031 | static int rfkill_fop_open(struct inode *inode, struct file *file) |
1032 | { | |
1033 | struct rfkill_data *data; | |
1034 | struct rfkill *rfkill; | |
1035 | struct rfkill_int_event *ev, *tmp; | |
1036 | ||
1037 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1038 | if (!data) | |
1039 | return -ENOMEM; | |
1040 | ||
1041 | INIT_LIST_HEAD(&data->events); | |
1042 | mutex_init(&data->mtx); | |
1043 | init_waitqueue_head(&data->read_wait); | |
1044 | ||
1045 | mutex_lock(&rfkill_global_mutex); | |
1046 | mutex_lock(&data->mtx); | |
1047 | /* | |
1048 | * start getting events from elsewhere but hold mtx to get | |
1049 | * startup events added first | |
1050 | */ | |
c64fb016 JB |
1051 | |
1052 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1053 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
1054 | if (!ev) | |
1055 | goto free; | |
1056 | rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); | |
1057 | list_add_tail(&ev->list, &data->events); | |
1058 | } | |
bd2281b8 | 1059 | list_add(&data->list, &rfkill_fds); |
c64fb016 JB |
1060 | mutex_unlock(&data->mtx); |
1061 | mutex_unlock(&rfkill_global_mutex); | |
1062 | ||
1063 | file->private_data = data; | |
1064 | ||
1065 | return nonseekable_open(inode, file); | |
1066 | ||
1067 | free: | |
1068 | mutex_unlock(&data->mtx); | |
1069 | mutex_unlock(&rfkill_global_mutex); | |
1070 | mutex_destroy(&data->mtx); | |
1071 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1072 | kfree(ev); | |
1073 | kfree(data); | |
1074 | return -ENOMEM; | |
1075 | } | |
1076 | ||
1077 | static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait) | |
1078 | { | |
1079 | struct rfkill_data *data = file->private_data; | |
1080 | unsigned int res = POLLOUT | POLLWRNORM; | |
1081 | ||
1082 | poll_wait(file, &data->read_wait, wait); | |
1083 | ||
1084 | mutex_lock(&data->mtx); | |
1085 | if (!list_empty(&data->events)) | |
1086 | res = POLLIN | POLLRDNORM; | |
1087 | mutex_unlock(&data->mtx); | |
1088 | ||
1089 | return res; | |
1090 | } | |
1091 | ||
1092 | static bool rfkill_readable(struct rfkill_data *data) | |
1093 | { | |
1094 | bool r; | |
1095 | ||
1096 | mutex_lock(&data->mtx); | |
1097 | r = !list_empty(&data->events); | |
1098 | mutex_unlock(&data->mtx); | |
1099 | ||
1100 | return r; | |
1101 | } | |
1102 | ||
1103 | static ssize_t rfkill_fop_read(struct file *file, char __user *buf, | |
1104 | size_t count, loff_t *pos) | |
1105 | { | |
1106 | struct rfkill_data *data = file->private_data; | |
1107 | struct rfkill_int_event *ev; | |
1108 | unsigned long sz; | |
1109 | int ret; | |
1110 | ||
1111 | mutex_lock(&data->mtx); | |
1112 | ||
1113 | while (list_empty(&data->events)) { | |
1114 | if (file->f_flags & O_NONBLOCK) { | |
1115 | ret = -EAGAIN; | |
1116 | goto out; | |
1117 | } | |
1118 | mutex_unlock(&data->mtx); | |
1119 | ret = wait_event_interruptible(data->read_wait, | |
1120 | rfkill_readable(data)); | |
1121 | mutex_lock(&data->mtx); | |
1122 | ||
1123 | if (ret) | |
1124 | goto out; | |
1125 | } | |
1126 | ||
1127 | ev = list_first_entry(&data->events, struct rfkill_int_event, | |
1128 | list); | |
1129 | ||
1130 | sz = min_t(unsigned long, sizeof(ev->ev), count); | |
1131 | ret = sz; | |
1132 | if (copy_to_user(buf, &ev->ev, sz)) | |
1133 | ret = -EFAULT; | |
1134 | ||
1135 | list_del(&ev->list); | |
1136 | kfree(ev); | |
1137 | out: | |
1138 | mutex_unlock(&data->mtx); | |
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, | |
1143 | size_t count, loff_t *pos) | |
1144 | { | |
1145 | struct rfkill *rfkill; | |
1146 | struct rfkill_event ev; | |
1147 | ||
1148 | /* we don't need the 'hard' variable but accept it */ | |
1be491fc | 1149 | if (count < RFKILL_EVENT_SIZE_V1 - 1) |
c64fb016 JB |
1150 | return -EINVAL; |
1151 | ||
1be491fc JB |
1152 | /* |
1153 | * Copy as much data as we can accept into our 'ev' buffer, | |
1154 | * but tell userspace how much we've copied so it can determine | |
1155 | * our API version even in a write() call, if it cares. | |
1156 | */ | |
1157 | count = min(count, sizeof(ev)); | |
1158 | if (copy_from_user(&ev, buf, count)) | |
c64fb016 JB |
1159 | return -EFAULT; |
1160 | ||
1161 | if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL) | |
1162 | return -EINVAL; | |
1163 | ||
1164 | if (ev.type >= NUM_RFKILL_TYPES) | |
1165 | return -EINVAL; | |
1166 | ||
1167 | mutex_lock(&rfkill_global_mutex); | |
1168 | ||
1169 | if (ev.op == RFKILL_OP_CHANGE_ALL) { | |
1170 | if (ev.type == RFKILL_TYPE_ALL) { | |
1171 | enum rfkill_type i; | |
1172 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
1173 | rfkill_global_states[i].cur = ev.soft; | |
1174 | } else { | |
1175 | rfkill_global_states[ev.type].cur = ev.soft; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1180 | if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL) | |
1181 | continue; | |
1182 | ||
1183 | if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL) | |
1184 | continue; | |
1185 | ||
1186 | rfkill_set_block(rfkill, ev.soft); | |
1187 | } | |
1188 | mutex_unlock(&rfkill_global_mutex); | |
1189 | ||
1190 | return count; | |
1191 | } | |
1192 | ||
1193 | static int rfkill_fop_release(struct inode *inode, struct file *file) | |
1194 | { | |
1195 | struct rfkill_data *data = file->private_data; | |
1196 | struct rfkill_int_event *ev, *tmp; | |
1197 | ||
1198 | mutex_lock(&rfkill_global_mutex); | |
1199 | list_del(&data->list); | |
1200 | mutex_unlock(&rfkill_global_mutex); | |
1201 | ||
1202 | mutex_destroy(&data->mtx); | |
1203 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1204 | kfree(ev); | |
1205 | ||
1206 | #ifdef CONFIG_RFKILL_INPUT | |
1207 | if (data->input_handler) | |
207ee162 JB |
1208 | if (atomic_dec_return(&rfkill_input_disabled) == 0) |
1209 | printk(KERN_DEBUG "rfkill: input handler enabled\n"); | |
c64fb016 JB |
1210 | #endif |
1211 | ||
1212 | kfree(data); | |
1213 | ||
1214 | return 0; | |
1215 | } | |
1216 | ||
1217 | #ifdef CONFIG_RFKILL_INPUT | |
1218 | static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, | |
1219 | unsigned long arg) | |
1220 | { | |
1221 | struct rfkill_data *data = file->private_data; | |
1222 | ||
1223 | if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) | |
1224 | return -ENOSYS; | |
1225 | ||
1226 | if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) | |
1227 | return -ENOSYS; | |
1228 | ||
1229 | mutex_lock(&data->mtx); | |
1230 | ||
1231 | if (!data->input_handler) { | |
207ee162 JB |
1232 | if (atomic_inc_return(&rfkill_input_disabled) == 1) |
1233 | printk(KERN_DEBUG "rfkill: input handler disabled\n"); | |
c64fb016 JB |
1234 | data->input_handler = true; |
1235 | } | |
1236 | ||
1237 | mutex_unlock(&data->mtx); | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | #endif | |
1242 | ||
1243 | static const struct file_operations rfkill_fops = { | |
45ba564d | 1244 | .owner = THIS_MODULE, |
c64fb016 JB |
1245 | .open = rfkill_fop_open, |
1246 | .read = rfkill_fop_read, | |
1247 | .write = rfkill_fop_write, | |
1248 | .poll = rfkill_fop_poll, | |
1249 | .release = rfkill_fop_release, | |
1250 | #ifdef CONFIG_RFKILL_INPUT | |
1251 | .unlocked_ioctl = rfkill_fop_ioctl, | |
1252 | .compat_ioctl = rfkill_fop_ioctl, | |
1253 | #endif | |
6038f373 | 1254 | .llseek = no_llseek, |
c64fb016 JB |
1255 | }; |
1256 | ||
1257 | static struct miscdevice rfkill_miscdev = { | |
1258 | .name = "rfkill", | |
1259 | .fops = &rfkill_fops, | |
1260 | .minor = MISC_DYNAMIC_MINOR, | |
1261 | }; | |
19d337df JB |
1262 | |
1263 | static int __init rfkill_init(void) | |
1264 | { | |
1265 | int error; | |
1266 | int i; | |
1267 | ||
1268 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 1269 | rfkill_global_states[i].cur = !rfkill_default_state; |
19d337df JB |
1270 | |
1271 | error = class_register(&rfkill_class); | |
1272 | if (error) | |
1273 | goto out; | |
1274 | ||
c64fb016 JB |
1275 | error = misc_register(&rfkill_miscdev); |
1276 | if (error) { | |
1277 | class_unregister(&rfkill_class); | |
1278 | goto out; | |
1279 | } | |
1280 | ||
19d337df JB |
1281 | #ifdef CONFIG_RFKILL_INPUT |
1282 | error = rfkill_handler_init(); | |
c64fb016 JB |
1283 | if (error) { |
1284 | misc_deregister(&rfkill_miscdev); | |
19d337df | 1285 | class_unregister(&rfkill_class); |
c64fb016 JB |
1286 | goto out; |
1287 | } | |
19d337df JB |
1288 | #endif |
1289 | ||
1290 | out: | |
1291 | return error; | |
1292 | } | |
1293 | subsys_initcall(rfkill_init); | |
1294 | ||
1295 | static void __exit rfkill_exit(void) | |
1296 | { | |
1297 | #ifdef CONFIG_RFKILL_INPUT | |
1298 | rfkill_handler_exit(); | |
1299 | #endif | |
c64fb016 | 1300 | misc_deregister(&rfkill_miscdev); |
19d337df JB |
1301 | class_unregister(&rfkill_class); |
1302 | } | |
1303 | module_exit(rfkill_exit); |