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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 | } | |
9b8e34e2 MK |
179 | |
180 | static struct led_trigger rfkill_any_led_trigger; | |
181 | static struct work_struct rfkill_any_work; | |
182 | ||
183 | static void rfkill_any_led_trigger_worker(struct work_struct *work) | |
184 | { | |
185 | enum led_brightness brightness = LED_OFF; | |
186 | struct rfkill *rfkill; | |
187 | ||
188 | mutex_lock(&rfkill_global_mutex); | |
189 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
190 | if (!(rfkill->state & RFKILL_BLOCK_ANY)) { | |
191 | brightness = LED_FULL; | |
192 | break; | |
193 | } | |
194 | } | |
195 | mutex_unlock(&rfkill_global_mutex); | |
196 | ||
197 | led_trigger_event(&rfkill_any_led_trigger, brightness); | |
198 | } | |
199 | ||
200 | static void rfkill_any_led_trigger_event(void) | |
201 | { | |
202 | schedule_work(&rfkill_any_work); | |
203 | } | |
204 | ||
205 | static void rfkill_any_led_trigger_activate(struct led_classdev *led_cdev) | |
206 | { | |
207 | rfkill_any_led_trigger_event(); | |
208 | } | |
209 | ||
210 | static int rfkill_any_led_trigger_register(void) | |
211 | { | |
212 | INIT_WORK(&rfkill_any_work, rfkill_any_led_trigger_worker); | |
213 | rfkill_any_led_trigger.name = "rfkill-any"; | |
214 | rfkill_any_led_trigger.activate = rfkill_any_led_trigger_activate; | |
215 | return led_trigger_register(&rfkill_any_led_trigger); | |
216 | } | |
217 | ||
218 | static void rfkill_any_led_trigger_unregister(void) | |
219 | { | |
220 | led_trigger_unregister(&rfkill_any_led_trigger); | |
221 | cancel_work_sync(&rfkill_any_work); | |
222 | } | |
19d337df JB |
223 | #else |
224 | static void rfkill_led_trigger_event(struct rfkill *rfkill) | |
225 | { | |
226 | } | |
227 | ||
228 | static inline int rfkill_led_trigger_register(struct rfkill *rfkill) | |
229 | { | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
234 | { | |
235 | } | |
9b8e34e2 MK |
236 | |
237 | static void rfkill_any_led_trigger_event(void) | |
238 | { | |
239 | } | |
240 | ||
241 | static int rfkill_any_led_trigger_register(void) | |
242 | { | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static void rfkill_any_led_trigger_unregister(void) | |
247 | { | |
248 | } | |
19d337df JB |
249 | #endif /* CONFIG_RFKILL_LEDS */ |
250 | ||
c64fb016 JB |
251 | static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill, |
252 | enum rfkill_operation op) | |
253 | { | |
254 | unsigned long flags; | |
255 | ||
256 | ev->idx = rfkill->idx; | |
257 | ev->type = rfkill->type; | |
258 | ev->op = op; | |
259 | ||
260 | spin_lock_irqsave(&rfkill->lock, flags); | |
261 | ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW); | |
262 | ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW | | |
263 | RFKILL_BLOCK_SW_PREV)); | |
264 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
265 | } | |
266 | ||
267 | static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op) | |
268 | { | |
269 | struct rfkill_data *data; | |
270 | struct rfkill_int_event *ev; | |
271 | ||
272 | list_for_each_entry(data, &rfkill_fds, list) { | |
273 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
274 | if (!ev) | |
275 | continue; | |
276 | rfkill_fill_event(&ev->ev, rfkill, op); | |
277 | mutex_lock(&data->mtx); | |
278 | list_add_tail(&ev->list, &data->events); | |
279 | mutex_unlock(&data->mtx); | |
280 | wake_up_interruptible(&data->read_wait); | |
281 | } | |
282 | } | |
283 | ||
284 | static void rfkill_event(struct rfkill *rfkill) | |
19d337df | 285 | { |
06d5caf4 | 286 | if (!rfkill->registered) |
19d337df JB |
287 | return; |
288 | ||
289 | kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); | |
c64fb016 JB |
290 | |
291 | /* also send event to /dev/rfkill */ | |
292 | rfkill_send_events(rfkill, RFKILL_OP_CHANGE); | |
19d337df JB |
293 | } |
294 | ||
19d337df JB |
295 | /** |
296 | * rfkill_set_block - wrapper for set_block method | |
297 | * | |
298 | * @rfkill: the rfkill struct to use | |
299 | * @blocked: the new software state | |
300 | * | |
301 | * Calls the set_block method (when applicable) and handles notifications | |
302 | * etc. as well. | |
303 | */ | |
304 | static void rfkill_set_block(struct rfkill *rfkill, bool blocked) | |
305 | { | |
306 | unsigned long flags; | |
eab48345 | 307 | bool prev, curr; |
19d337df JB |
308 | int err; |
309 | ||
7fa20a7f AJ |
310 | if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) |
311 | return; | |
312 | ||
19d337df JB |
313 | /* |
314 | * Some platforms (...!) generate input events which affect the | |
315 | * _hard_ kill state -- whenever something tries to change the | |
316 | * current software state query the hardware state too. | |
317 | */ | |
318 | if (rfkill->ops->query) | |
319 | rfkill->ops->query(rfkill, rfkill->data); | |
320 | ||
321 | spin_lock_irqsave(&rfkill->lock, flags); | |
eab48345 VW |
322 | prev = rfkill->state & RFKILL_BLOCK_SW; |
323 | ||
f3e7fae2 | 324 | if (prev) |
19d337df JB |
325 | rfkill->state |= RFKILL_BLOCK_SW_PREV; |
326 | else | |
327 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
328 | ||
329 | if (blocked) | |
330 | rfkill->state |= RFKILL_BLOCK_SW; | |
331 | else | |
332 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
333 | ||
334 | rfkill->state |= RFKILL_BLOCK_SW_SETCALL; | |
335 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
336 | ||
19d337df JB |
337 | err = rfkill->ops->set_block(rfkill->data, blocked); |
338 | ||
339 | spin_lock_irqsave(&rfkill->lock, flags); | |
340 | if (err) { | |
341 | /* | |
3ff707d6 JPRV |
342 | * Failed -- reset status to _PREV, which may be different |
343 | * from what we have set _PREV to earlier in this function | |
19d337df JB |
344 | * if rfkill_set_sw_state was invoked. |
345 | */ | |
346 | if (rfkill->state & RFKILL_BLOCK_SW_PREV) | |
347 | rfkill->state |= RFKILL_BLOCK_SW; | |
348 | else | |
349 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
350 | } | |
351 | rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL; | |
352 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
eab48345 | 353 | curr = rfkill->state & RFKILL_BLOCK_SW; |
19d337df JB |
354 | spin_unlock_irqrestore(&rfkill->lock, flags); |
355 | ||
356 | rfkill_led_trigger_event(rfkill); | |
9b8e34e2 | 357 | rfkill_any_led_trigger_event(); |
eab48345 VW |
358 | |
359 | if (prev != curr) | |
360 | rfkill_event(rfkill); | |
19d337df JB |
361 | } |
362 | ||
9487bd6b JPRV |
363 | static void rfkill_update_global_state(enum rfkill_type type, bool blocked) |
364 | { | |
365 | int i; | |
366 | ||
367 | if (type != RFKILL_TYPE_ALL) { | |
368 | rfkill_global_states[type].cur = blocked; | |
369 | return; | |
370 | } | |
371 | ||
372 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
373 | rfkill_global_states[i].cur = blocked; | |
374 | } | |
375 | ||
c64fb016 JB |
376 | #ifdef CONFIG_RFKILL_INPUT |
377 | static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); | |
378 | ||
19d337df JB |
379 | /** |
380 | * __rfkill_switch_all - Toggle state of all switches of given type | |
381 | * @type: type of interfaces to be affected | |
2f29fed3 | 382 | * @blocked: the new state |
19d337df JB |
383 | * |
384 | * This function sets the state of all switches of given type, | |
e2a35e89 | 385 | * unless a specific switch is suspended. |
19d337df JB |
386 | * |
387 | * Caller must have acquired rfkill_global_mutex. | |
388 | */ | |
389 | static void __rfkill_switch_all(const enum rfkill_type type, bool blocked) | |
390 | { | |
391 | struct rfkill *rfkill; | |
392 | ||
9487bd6b | 393 | rfkill_update_global_state(type, blocked); |
19d337df | 394 | list_for_each_entry(rfkill, &rfkill_list, node) { |
27e49ca9 | 395 | if (rfkill->type != type && type != RFKILL_TYPE_ALL) |
19d337df JB |
396 | continue; |
397 | ||
398 | rfkill_set_block(rfkill, blocked); | |
399 | } | |
400 | } | |
401 | ||
402 | /** | |
403 | * rfkill_switch_all - Toggle state of all switches of given type | |
404 | * @type: type of interfaces to be affected | |
2f29fed3 | 405 | * @blocked: the new state |
19d337df JB |
406 | * |
407 | * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). | |
408 | * Please refer to __rfkill_switch_all() for details. | |
409 | * | |
410 | * Does nothing if the EPO lock is active. | |
411 | */ | |
412 | void rfkill_switch_all(enum rfkill_type type, bool blocked) | |
413 | { | |
c64fb016 JB |
414 | if (atomic_read(&rfkill_input_disabled)) |
415 | return; | |
416 | ||
19d337df JB |
417 | mutex_lock(&rfkill_global_mutex); |
418 | ||
419 | if (!rfkill_epo_lock_active) | |
420 | __rfkill_switch_all(type, blocked); | |
421 | ||
422 | mutex_unlock(&rfkill_global_mutex); | |
423 | } | |
424 | ||
425 | /** | |
426 | * rfkill_epo - emergency power off all transmitters | |
427 | * | |
428 | * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, | |
429 | * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. | |
430 | * | |
431 | * The global state before the EPO is saved and can be restored later | |
432 | * using rfkill_restore_states(). | |
433 | */ | |
434 | void rfkill_epo(void) | |
435 | { | |
436 | struct rfkill *rfkill; | |
437 | int i; | |
438 | ||
c64fb016 JB |
439 | if (atomic_read(&rfkill_input_disabled)) |
440 | return; | |
441 | ||
19d337df JB |
442 | mutex_lock(&rfkill_global_mutex); |
443 | ||
444 | rfkill_epo_lock_active = true; | |
445 | list_for_each_entry(rfkill, &rfkill_list, node) | |
446 | rfkill_set_block(rfkill, true); | |
447 | ||
448 | for (i = 0; i < NUM_RFKILL_TYPES; i++) { | |
b3fa1329 | 449 | rfkill_global_states[i].sav = rfkill_global_states[i].cur; |
19d337df JB |
450 | rfkill_global_states[i].cur = true; |
451 | } | |
c64fb016 | 452 | |
19d337df JB |
453 | mutex_unlock(&rfkill_global_mutex); |
454 | } | |
455 | ||
456 | /** | |
457 | * rfkill_restore_states - restore global states | |
458 | * | |
459 | * Restore (and sync switches to) the global state from the | |
460 | * states in rfkill_default_states. This can undo the effects of | |
461 | * a call to rfkill_epo(). | |
462 | */ | |
463 | void rfkill_restore_states(void) | |
464 | { | |
465 | int i; | |
466 | ||
c64fb016 JB |
467 | if (atomic_read(&rfkill_input_disabled)) |
468 | return; | |
469 | ||
19d337df JB |
470 | mutex_lock(&rfkill_global_mutex); |
471 | ||
472 | rfkill_epo_lock_active = false; | |
473 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 474 | __rfkill_switch_all(i, rfkill_global_states[i].sav); |
19d337df JB |
475 | mutex_unlock(&rfkill_global_mutex); |
476 | } | |
477 | ||
478 | /** | |
479 | * rfkill_remove_epo_lock - unlock state changes | |
480 | * | |
481 | * Used by rfkill-input manually unlock state changes, when | |
482 | * the EPO switch is deactivated. | |
483 | */ | |
484 | void rfkill_remove_epo_lock(void) | |
485 | { | |
c64fb016 JB |
486 | if (atomic_read(&rfkill_input_disabled)) |
487 | return; | |
488 | ||
19d337df JB |
489 | mutex_lock(&rfkill_global_mutex); |
490 | rfkill_epo_lock_active = false; | |
491 | mutex_unlock(&rfkill_global_mutex); | |
492 | } | |
493 | ||
494 | /** | |
495 | * rfkill_is_epo_lock_active - returns true EPO is active | |
496 | * | |
497 | * Returns 0 (false) if there is NOT an active EPO contidion, | |
498 | * and 1 (true) if there is an active EPO contition, which | |
499 | * locks all radios in one of the BLOCKED states. | |
500 | * | |
501 | * Can be called in atomic context. | |
502 | */ | |
503 | bool rfkill_is_epo_lock_active(void) | |
504 | { | |
505 | return rfkill_epo_lock_active; | |
506 | } | |
507 | ||
508 | /** | |
509 | * rfkill_get_global_sw_state - returns global state for a type | |
510 | * @type: the type to get the global state of | |
511 | * | |
512 | * Returns the current global state for a given wireless | |
513 | * device type. | |
514 | */ | |
515 | bool rfkill_get_global_sw_state(const enum rfkill_type type) | |
516 | { | |
517 | return rfkill_global_states[type].cur; | |
518 | } | |
c64fb016 | 519 | #endif |
19d337df | 520 | |
19d337df JB |
521 | bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked) |
522 | { | |
1926e260 JPRV |
523 | unsigned long flags; |
524 | bool ret, prev; | |
525 | ||
526 | BUG_ON(!rfkill); | |
19d337df | 527 | |
1926e260 JPRV |
528 | spin_lock_irqsave(&rfkill->lock, flags); |
529 | prev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
530 | if (blocked) | |
531 | rfkill->state |= RFKILL_BLOCK_HW; | |
532 | else | |
533 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
534 | ret = !!(rfkill->state & RFKILL_BLOCK_ANY); | |
535 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
19d337df | 536 | |
1926e260 | 537 | rfkill_led_trigger_event(rfkill); |
9b8e34e2 | 538 | rfkill_any_led_trigger_event(); |
19d337df | 539 | |
74204f8f | 540 | if (rfkill->registered && prev != blocked) |
19d337df JB |
541 | schedule_work(&rfkill->uevent_work); |
542 | ||
543 | return ret; | |
544 | } | |
545 | EXPORT_SYMBOL(rfkill_set_hw_state); | |
546 | ||
547 | static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
548 | { | |
549 | u32 bit = RFKILL_BLOCK_SW; | |
550 | ||
551 | /* if in a ops->set_block right now, use other bit */ | |
552 | if (rfkill->state & RFKILL_BLOCK_SW_SETCALL) | |
553 | bit = RFKILL_BLOCK_SW_PREV; | |
554 | ||
555 | if (blocked) | |
556 | rfkill->state |= bit; | |
557 | else | |
558 | rfkill->state &= ~bit; | |
559 | } | |
560 | ||
561 | bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
562 | { | |
563 | unsigned long flags; | |
564 | bool prev, hwblock; | |
565 | ||
566 | BUG_ON(!rfkill); | |
567 | ||
568 | spin_lock_irqsave(&rfkill->lock, flags); | |
569 | prev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
570 | __rfkill_set_sw_state(rfkill, blocked); | |
571 | hwblock = !!(rfkill->state & RFKILL_BLOCK_HW); | |
572 | blocked = blocked || hwblock; | |
573 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
574 | ||
06d5caf4 AJ |
575 | if (!rfkill->registered) |
576 | return blocked; | |
19d337df | 577 | |
06d5caf4 AJ |
578 | if (prev != blocked && !hwblock) |
579 | schedule_work(&rfkill->uevent_work); | |
580 | ||
581 | rfkill_led_trigger_event(rfkill); | |
9b8e34e2 | 582 | rfkill_any_led_trigger_event(); |
19d337df JB |
583 | |
584 | return blocked; | |
585 | } | |
586 | EXPORT_SYMBOL(rfkill_set_sw_state); | |
587 | ||
06d5caf4 AJ |
588 | void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked) |
589 | { | |
590 | unsigned long flags; | |
591 | ||
592 | BUG_ON(!rfkill); | |
593 | BUG_ON(rfkill->registered); | |
594 | ||
595 | spin_lock_irqsave(&rfkill->lock, flags); | |
596 | __rfkill_set_sw_state(rfkill, blocked); | |
597 | rfkill->persistent = true; | |
598 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
599 | } | |
600 | EXPORT_SYMBOL(rfkill_init_sw_state); | |
601 | ||
19d337df JB |
602 | void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw) |
603 | { | |
604 | unsigned long flags; | |
605 | bool swprev, hwprev; | |
606 | ||
607 | BUG_ON(!rfkill); | |
608 | ||
609 | spin_lock_irqsave(&rfkill->lock, flags); | |
610 | ||
611 | /* | |
612 | * No need to care about prev/setblock ... this is for uevent only | |
613 | * and that will get triggered by rfkill_set_block anyway. | |
614 | */ | |
615 | swprev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
616 | hwprev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
617 | __rfkill_set_sw_state(rfkill, sw); | |
48ab3578 AJ |
618 | if (hw) |
619 | rfkill->state |= RFKILL_BLOCK_HW; | |
620 | else | |
621 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
19d337df JB |
622 | |
623 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
624 | ||
b3fa1329 AJ |
625 | if (!rfkill->registered) { |
626 | rfkill->persistent = true; | |
627 | } else { | |
628 | if (swprev != sw || hwprev != hw) | |
629 | schedule_work(&rfkill->uevent_work); | |
19d337df | 630 | |
b3fa1329 | 631 | rfkill_led_trigger_event(rfkill); |
9b8e34e2 | 632 | rfkill_any_led_trigger_event(); |
b3fa1329 | 633 | } |
19d337df JB |
634 | } |
635 | EXPORT_SYMBOL(rfkill_set_states); | |
636 | ||
648b50dd HK |
637 | static const char * const rfkill_types[] = { |
638 | NULL, /* RFKILL_TYPE_ALL */ | |
639 | "wlan", | |
640 | "bluetooth", | |
641 | "ultrawideband", | |
642 | "wimax", | |
643 | "wwan", | |
644 | "gps", | |
645 | "fm", | |
646 | "nfc", | |
647 | }; | |
648 | ||
649 | enum rfkill_type rfkill_find_type(const char *name) | |
650 | { | |
651 | int i; | |
652 | ||
653 | BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES); | |
654 | ||
655 | if (!name) | |
656 | return RFKILL_TYPE_ALL; | |
657 | ||
658 | for (i = 1; i < NUM_RFKILL_TYPES; i++) | |
659 | if (!strcmp(name, rfkill_types[i])) | |
660 | return i; | |
661 | return RFKILL_TYPE_ALL; | |
662 | } | |
663 | EXPORT_SYMBOL(rfkill_find_type); | |
664 | ||
e49df67d GKH |
665 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
666 | char *buf) | |
19d337df JB |
667 | { |
668 | struct rfkill *rfkill = to_rfkill(dev); | |
669 | ||
670 | return sprintf(buf, "%s\n", rfkill->name); | |
671 | } | |
e49df67d | 672 | static DEVICE_ATTR_RO(name); |
19d337df | 673 | |
e49df67d GKH |
674 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
675 | char *buf) | |
19d337df JB |
676 | { |
677 | struct rfkill *rfkill = to_rfkill(dev); | |
678 | ||
648b50dd | 679 | return sprintf(buf, "%s\n", rfkill_types[rfkill->type]); |
19d337df | 680 | } |
e49df67d | 681 | static DEVICE_ATTR_RO(type); |
19d337df | 682 | |
e49df67d GKH |
683 | static ssize_t index_show(struct device *dev, struct device_attribute *attr, |
684 | char *buf) | |
c64fb016 JB |
685 | { |
686 | struct rfkill *rfkill = to_rfkill(dev); | |
687 | ||
688 | return sprintf(buf, "%d\n", rfkill->idx); | |
689 | } | |
e49df67d | 690 | static DEVICE_ATTR_RO(index); |
c64fb016 | 691 | |
e49df67d GKH |
692 | static ssize_t persistent_show(struct device *dev, |
693 | struct device_attribute *attr, char *buf) | |
464902e8 AJ |
694 | { |
695 | struct rfkill *rfkill = to_rfkill(dev); | |
696 | ||
697 | return sprintf(buf, "%d\n", rfkill->persistent); | |
698 | } | |
e49df67d | 699 | static DEVICE_ATTR_RO(persistent); |
464902e8 | 700 | |
e49df67d GKH |
701 | static ssize_t hard_show(struct device *dev, struct device_attribute *attr, |
702 | char *buf) | |
6c26361e | 703 | { |
704 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 705 | |
819bfecc | 706 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 ); |
6c26361e | 707 | } |
e49df67d | 708 | static DEVICE_ATTR_RO(hard); |
6c26361e | 709 | |
e49df67d GKH |
710 | static ssize_t soft_show(struct device *dev, struct device_attribute *attr, |
711 | char *buf) | |
6c26361e | 712 | { |
713 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 714 | |
819bfecc | 715 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 ); |
6c26361e | 716 | } |
717 | ||
e49df67d GKH |
718 | static ssize_t soft_store(struct device *dev, struct device_attribute *attr, |
719 | const char *buf, size_t count) | |
6c26361e | 720 | { |
721 | struct rfkill *rfkill = to_rfkill(dev); | |
722 | unsigned long state; | |
723 | int err; | |
724 | ||
725 | if (!capable(CAP_NET_ADMIN)) | |
726 | return -EPERM; | |
727 | ||
1bac92ca | 728 | err = kstrtoul(buf, 0, &state); |
6c26361e | 729 | if (err) |
730 | return err; | |
731 | ||
732 | if (state > 1 ) | |
733 | return -EINVAL; | |
734 | ||
735 | mutex_lock(&rfkill_global_mutex); | |
736 | rfkill_set_block(rfkill, state); | |
737 | mutex_unlock(&rfkill_global_mutex); | |
738 | ||
6f7c962c | 739 | return count; |
6c26361e | 740 | } |
e49df67d | 741 | static DEVICE_ATTR_RW(soft); |
6c26361e | 742 | |
19d337df JB |
743 | static u8 user_state_from_blocked(unsigned long state) |
744 | { | |
745 | if (state & RFKILL_BLOCK_HW) | |
746 | return RFKILL_USER_STATE_HARD_BLOCKED; | |
747 | if (state & RFKILL_BLOCK_SW) | |
748 | return RFKILL_USER_STATE_SOFT_BLOCKED; | |
749 | ||
750 | return RFKILL_USER_STATE_UNBLOCKED; | |
751 | } | |
752 | ||
e49df67d GKH |
753 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
754 | char *buf) | |
19d337df JB |
755 | { |
756 | struct rfkill *rfkill = to_rfkill(dev); | |
19d337df | 757 | |
819bfecc | 758 | return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state)); |
19d337df JB |
759 | } |
760 | ||
e49df67d GKH |
761 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
762 | const char *buf, size_t count) | |
19d337df | 763 | { |
f54c1427 JB |
764 | struct rfkill *rfkill = to_rfkill(dev); |
765 | unsigned long state; | |
766 | int err; | |
767 | ||
768 | if (!capable(CAP_NET_ADMIN)) | |
769 | return -EPERM; | |
770 | ||
1bac92ca | 771 | err = kstrtoul(buf, 0, &state); |
f54c1427 JB |
772 | if (err) |
773 | return err; | |
774 | ||
775 | if (state != RFKILL_USER_STATE_SOFT_BLOCKED && | |
776 | state != RFKILL_USER_STATE_UNBLOCKED) | |
777 | return -EINVAL; | |
778 | ||
779 | mutex_lock(&rfkill_global_mutex); | |
780 | rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); | |
781 | mutex_unlock(&rfkill_global_mutex); | |
19d337df | 782 | |
6f7c962c | 783 | return count; |
19d337df | 784 | } |
e49df67d | 785 | static DEVICE_ATTR_RW(state); |
19d337df | 786 | |
e49df67d GKH |
787 | static struct attribute *rfkill_dev_attrs[] = { |
788 | &dev_attr_name.attr, | |
789 | &dev_attr_type.attr, | |
790 | &dev_attr_index.attr, | |
791 | &dev_attr_persistent.attr, | |
792 | &dev_attr_state.attr, | |
e49df67d GKH |
793 | &dev_attr_soft.attr, |
794 | &dev_attr_hard.attr, | |
795 | NULL, | |
19d337df | 796 | }; |
e49df67d | 797 | ATTRIBUTE_GROUPS(rfkill_dev); |
19d337df JB |
798 | |
799 | static void rfkill_release(struct device *dev) | |
800 | { | |
801 | struct rfkill *rfkill = to_rfkill(dev); | |
802 | ||
803 | kfree(rfkill); | |
804 | } | |
805 | ||
806 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
807 | { | |
808 | struct rfkill *rfkill = to_rfkill(dev); | |
809 | unsigned long flags; | |
810 | u32 state; | |
811 | int error; | |
812 | ||
813 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); | |
814 | if (error) | |
815 | return error; | |
816 | error = add_uevent_var(env, "RFKILL_TYPE=%s", | |
648b50dd | 817 | rfkill_types[rfkill->type]); |
19d337df JB |
818 | if (error) |
819 | return error; | |
820 | spin_lock_irqsave(&rfkill->lock, flags); | |
821 | state = rfkill->state; | |
822 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
823 | error = add_uevent_var(env, "RFKILL_STATE=%d", | |
824 | user_state_from_blocked(state)); | |
825 | return error; | |
826 | } | |
827 | ||
828 | void rfkill_pause_polling(struct rfkill *rfkill) | |
829 | { | |
830 | BUG_ON(!rfkill); | |
831 | ||
832 | if (!rfkill->ops->poll) | |
833 | return; | |
834 | ||
dd21dfc6 | 835 | rfkill->polling_paused = true; |
19d337df JB |
836 | cancel_delayed_work_sync(&rfkill->poll_work); |
837 | } | |
838 | EXPORT_SYMBOL(rfkill_pause_polling); | |
839 | ||
840 | void rfkill_resume_polling(struct rfkill *rfkill) | |
841 | { | |
842 | BUG_ON(!rfkill); | |
843 | ||
844 | if (!rfkill->ops->poll) | |
845 | return; | |
846 | ||
dd21dfc6 JB |
847 | rfkill->polling_paused = false; |
848 | ||
849 | if (rfkill->suspended) | |
850 | return; | |
851 | ||
67235cbc SD |
852 | queue_delayed_work(system_power_efficient_wq, |
853 | &rfkill->poll_work, 0); | |
19d337df JB |
854 | } |
855 | EXPORT_SYMBOL(rfkill_resume_polling); | |
856 | ||
28f297a7 LPC |
857 | #ifdef CONFIG_PM_SLEEP |
858 | static int rfkill_suspend(struct device *dev) | |
19d337df JB |
859 | { |
860 | struct rfkill *rfkill = to_rfkill(dev); | |
861 | ||
dd21dfc6 JB |
862 | rfkill->suspended = true; |
863 | cancel_delayed_work_sync(&rfkill->poll_work); | |
19d337df | 864 | |
19d337df JB |
865 | return 0; |
866 | } | |
867 | ||
868 | static int rfkill_resume(struct device *dev) | |
869 | { | |
870 | struct rfkill *rfkill = to_rfkill(dev); | |
871 | bool cur; | |
872 | ||
dd21dfc6 JB |
873 | rfkill->suspended = false; |
874 | ||
06d5caf4 AJ |
875 | if (!rfkill->persistent) { |
876 | cur = !!(rfkill->state & RFKILL_BLOCK_SW); | |
877 | rfkill_set_block(rfkill, cur); | |
878 | } | |
19d337df | 879 | |
dd21dfc6 JB |
880 | if (rfkill->ops->poll && !rfkill->polling_paused) |
881 | queue_delayed_work(system_power_efficient_wq, | |
882 | &rfkill->poll_work, 0); | |
19d337df JB |
883 | |
884 | return 0; | |
885 | } | |
886 | ||
28f297a7 LPC |
887 | static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume); |
888 | #define RFKILL_PM_OPS (&rfkill_pm_ops) | |
889 | #else | |
890 | #define RFKILL_PM_OPS NULL | |
891 | #endif | |
892 | ||
19d337df JB |
893 | static struct class rfkill_class = { |
894 | .name = "rfkill", | |
895 | .dev_release = rfkill_release, | |
e49df67d | 896 | .dev_groups = rfkill_dev_groups, |
19d337df | 897 | .dev_uevent = rfkill_dev_uevent, |
28f297a7 | 898 | .pm = RFKILL_PM_OPS, |
19d337df JB |
899 | }; |
900 | ||
6081162e JB |
901 | bool rfkill_blocked(struct rfkill *rfkill) |
902 | { | |
903 | unsigned long flags; | |
904 | u32 state; | |
905 | ||
906 | spin_lock_irqsave(&rfkill->lock, flags); | |
907 | state = rfkill->state; | |
908 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
909 | ||
910 | return !!(state & RFKILL_BLOCK_ANY); | |
911 | } | |
912 | EXPORT_SYMBOL(rfkill_blocked); | |
913 | ||
19d337df JB |
914 | |
915 | struct rfkill * __must_check rfkill_alloc(const char *name, | |
916 | struct device *parent, | |
917 | const enum rfkill_type type, | |
918 | const struct rfkill_ops *ops, | |
919 | void *ops_data) | |
920 | { | |
921 | struct rfkill *rfkill; | |
922 | struct device *dev; | |
923 | ||
924 | if (WARN_ON(!ops)) | |
925 | return NULL; | |
926 | ||
927 | if (WARN_ON(!ops->set_block)) | |
928 | return NULL; | |
929 | ||
930 | if (WARN_ON(!name)) | |
931 | return NULL; | |
932 | ||
c64fb016 | 933 | if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) |
19d337df JB |
934 | return NULL; |
935 | ||
b7bb1100 | 936 | rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL); |
19d337df JB |
937 | if (!rfkill) |
938 | return NULL; | |
939 | ||
940 | spin_lock_init(&rfkill->lock); | |
941 | INIT_LIST_HEAD(&rfkill->node); | |
942 | rfkill->type = type; | |
b7bb1100 | 943 | strcpy(rfkill->name, name); |
19d337df JB |
944 | rfkill->ops = ops; |
945 | rfkill->data = ops_data; | |
946 | ||
947 | dev = &rfkill->dev; | |
948 | dev->class = &rfkill_class; | |
949 | dev->parent = parent; | |
950 | device_initialize(dev); | |
951 | ||
952 | return rfkill; | |
953 | } | |
954 | EXPORT_SYMBOL(rfkill_alloc); | |
955 | ||
956 | static void rfkill_poll(struct work_struct *work) | |
957 | { | |
958 | struct rfkill *rfkill; | |
959 | ||
960 | rfkill = container_of(work, struct rfkill, poll_work.work); | |
961 | ||
962 | /* | |
963 | * Poll hardware state -- driver will use one of the | |
964 | * rfkill_set{,_hw,_sw}_state functions and use its | |
965 | * return value to update the current status. | |
966 | */ | |
967 | rfkill->ops->poll(rfkill, rfkill->data); | |
968 | ||
67235cbc SD |
969 | queue_delayed_work(system_power_efficient_wq, |
970 | &rfkill->poll_work, | |
19d337df JB |
971 | round_jiffies_relative(POLL_INTERVAL)); |
972 | } | |
973 | ||
974 | static void rfkill_uevent_work(struct work_struct *work) | |
975 | { | |
976 | struct rfkill *rfkill; | |
977 | ||
978 | rfkill = container_of(work, struct rfkill, uevent_work); | |
979 | ||
c64fb016 JB |
980 | mutex_lock(&rfkill_global_mutex); |
981 | rfkill_event(rfkill); | |
982 | mutex_unlock(&rfkill_global_mutex); | |
19d337df JB |
983 | } |
984 | ||
985 | static void rfkill_sync_work(struct work_struct *work) | |
986 | { | |
987 | struct rfkill *rfkill; | |
988 | bool cur; | |
989 | ||
990 | rfkill = container_of(work, struct rfkill, sync_work); | |
991 | ||
992 | mutex_lock(&rfkill_global_mutex); | |
993 | cur = rfkill_global_states[rfkill->type].cur; | |
994 | rfkill_set_block(rfkill, cur); | |
995 | mutex_unlock(&rfkill_global_mutex); | |
996 | } | |
997 | ||
998 | int __must_check rfkill_register(struct rfkill *rfkill) | |
999 | { | |
1000 | static unsigned long rfkill_no; | |
1001 | struct device *dev = &rfkill->dev; | |
1002 | int error; | |
1003 | ||
1004 | BUG_ON(!rfkill); | |
1005 | ||
1006 | mutex_lock(&rfkill_global_mutex); | |
1007 | ||
1008 | if (rfkill->registered) { | |
1009 | error = -EALREADY; | |
1010 | goto unlock; | |
1011 | } | |
1012 | ||
c64fb016 | 1013 | rfkill->idx = rfkill_no; |
19d337df JB |
1014 | dev_set_name(dev, "rfkill%lu", rfkill_no); |
1015 | rfkill_no++; | |
1016 | ||
19d337df JB |
1017 | list_add_tail(&rfkill->node, &rfkill_list); |
1018 | ||
1019 | error = device_add(dev); | |
1020 | if (error) | |
1021 | goto remove; | |
1022 | ||
1023 | error = rfkill_led_trigger_register(rfkill); | |
1024 | if (error) | |
1025 | goto devdel; | |
1026 | ||
1027 | rfkill->registered = true; | |
1028 | ||
2ec2c68c | 1029 | INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); |
19d337df | 1030 | INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); |
19d337df | 1031 | INIT_WORK(&rfkill->sync_work, rfkill_sync_work); |
2ec2c68c JB |
1032 | |
1033 | if (rfkill->ops->poll) | |
67235cbc SD |
1034 | queue_delayed_work(system_power_efficient_wq, |
1035 | &rfkill->poll_work, | |
2ec2c68c | 1036 | round_jiffies_relative(POLL_INTERVAL)); |
b3fa1329 AJ |
1037 | |
1038 | if (!rfkill->persistent || rfkill_epo_lock_active) { | |
1039 | schedule_work(&rfkill->sync_work); | |
1040 | } else { | |
1041 | #ifdef CONFIG_RFKILL_INPUT | |
1042 | bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); | |
1043 | ||
1044 | if (!atomic_read(&rfkill_input_disabled)) | |
1045 | __rfkill_switch_all(rfkill->type, soft_blocked); | |
1046 | #endif | |
1047 | } | |
2ec2c68c | 1048 | |
9b8e34e2 | 1049 | rfkill_any_led_trigger_event(); |
c64fb016 | 1050 | rfkill_send_events(rfkill, RFKILL_OP_ADD); |
19d337df JB |
1051 | |
1052 | mutex_unlock(&rfkill_global_mutex); | |
1053 | return 0; | |
1054 | ||
1055 | devdel: | |
1056 | device_del(&rfkill->dev); | |
1057 | remove: | |
1058 | list_del_init(&rfkill->node); | |
1059 | unlock: | |
1060 | mutex_unlock(&rfkill_global_mutex); | |
1061 | return error; | |
1062 | } | |
1063 | EXPORT_SYMBOL(rfkill_register); | |
1064 | ||
1065 | void rfkill_unregister(struct rfkill *rfkill) | |
1066 | { | |
1067 | BUG_ON(!rfkill); | |
1068 | ||
1069 | if (rfkill->ops->poll) | |
1070 | cancel_delayed_work_sync(&rfkill->poll_work); | |
1071 | ||
1072 | cancel_work_sync(&rfkill->uevent_work); | |
1073 | cancel_work_sync(&rfkill->sync_work); | |
1074 | ||
1075 | rfkill->registered = false; | |
1076 | ||
1077 | device_del(&rfkill->dev); | |
1078 | ||
1079 | mutex_lock(&rfkill_global_mutex); | |
c64fb016 | 1080 | rfkill_send_events(rfkill, RFKILL_OP_DEL); |
19d337df | 1081 | list_del_init(&rfkill->node); |
9b8e34e2 | 1082 | rfkill_any_led_trigger_event(); |
19d337df JB |
1083 | mutex_unlock(&rfkill_global_mutex); |
1084 | ||
1085 | rfkill_led_trigger_unregister(rfkill); | |
1086 | } | |
1087 | EXPORT_SYMBOL(rfkill_unregister); | |
1088 | ||
1089 | void rfkill_destroy(struct rfkill *rfkill) | |
1090 | { | |
1091 | if (rfkill) | |
1092 | put_device(&rfkill->dev); | |
1093 | } | |
1094 | EXPORT_SYMBOL(rfkill_destroy); | |
1095 | ||
c64fb016 JB |
1096 | static int rfkill_fop_open(struct inode *inode, struct file *file) |
1097 | { | |
1098 | struct rfkill_data *data; | |
1099 | struct rfkill *rfkill; | |
1100 | struct rfkill_int_event *ev, *tmp; | |
1101 | ||
1102 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1103 | if (!data) | |
1104 | return -ENOMEM; | |
1105 | ||
1106 | INIT_LIST_HEAD(&data->events); | |
1107 | mutex_init(&data->mtx); | |
1108 | init_waitqueue_head(&data->read_wait); | |
1109 | ||
1110 | mutex_lock(&rfkill_global_mutex); | |
1111 | mutex_lock(&data->mtx); | |
1112 | /* | |
1113 | * start getting events from elsewhere but hold mtx to get | |
1114 | * startup events added first | |
1115 | */ | |
c64fb016 JB |
1116 | |
1117 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1118 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
1119 | if (!ev) | |
1120 | goto free; | |
1121 | rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); | |
1122 | list_add_tail(&ev->list, &data->events); | |
1123 | } | |
bd2281b8 | 1124 | list_add(&data->list, &rfkill_fds); |
c64fb016 JB |
1125 | mutex_unlock(&data->mtx); |
1126 | mutex_unlock(&rfkill_global_mutex); | |
1127 | ||
1128 | file->private_data = data; | |
1129 | ||
1130 | return nonseekable_open(inode, file); | |
1131 | ||
1132 | free: | |
1133 | mutex_unlock(&data->mtx); | |
1134 | mutex_unlock(&rfkill_global_mutex); | |
1135 | mutex_destroy(&data->mtx); | |
1136 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1137 | kfree(ev); | |
1138 | kfree(data); | |
1139 | return -ENOMEM; | |
1140 | } | |
1141 | ||
1142 | static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait) | |
1143 | { | |
1144 | struct rfkill_data *data = file->private_data; | |
1145 | unsigned int res = POLLOUT | POLLWRNORM; | |
1146 | ||
1147 | poll_wait(file, &data->read_wait, wait); | |
1148 | ||
1149 | mutex_lock(&data->mtx); | |
1150 | if (!list_empty(&data->events)) | |
1151 | res = POLLIN | POLLRDNORM; | |
1152 | mutex_unlock(&data->mtx); | |
1153 | ||
1154 | return res; | |
1155 | } | |
1156 | ||
c64fb016 JB |
1157 | static ssize_t rfkill_fop_read(struct file *file, char __user *buf, |
1158 | size_t count, loff_t *pos) | |
1159 | { | |
1160 | struct rfkill_data *data = file->private_data; | |
1161 | struct rfkill_int_event *ev; | |
1162 | unsigned long sz; | |
1163 | int ret; | |
1164 | ||
1165 | mutex_lock(&data->mtx); | |
1166 | ||
1167 | while (list_empty(&data->events)) { | |
1168 | if (file->f_flags & O_NONBLOCK) { | |
1169 | ret = -EAGAIN; | |
1170 | goto out; | |
1171 | } | |
1172 | mutex_unlock(&data->mtx); | |
6736fde9 JB |
1173 | /* since we re-check and it just compares pointers, |
1174 | * using !list_empty() without locking isn't a problem | |
1175 | */ | |
c64fb016 | 1176 | ret = wait_event_interruptible(data->read_wait, |
6736fde9 | 1177 | !list_empty(&data->events)); |
c64fb016 JB |
1178 | mutex_lock(&data->mtx); |
1179 | ||
1180 | if (ret) | |
1181 | goto out; | |
1182 | } | |
1183 | ||
1184 | ev = list_first_entry(&data->events, struct rfkill_int_event, | |
1185 | list); | |
1186 | ||
1187 | sz = min_t(unsigned long, sizeof(ev->ev), count); | |
1188 | ret = sz; | |
1189 | if (copy_to_user(buf, &ev->ev, sz)) | |
1190 | ret = -EFAULT; | |
1191 | ||
1192 | list_del(&ev->list); | |
1193 | kfree(ev); | |
1194 | out: | |
1195 | mutex_unlock(&data->mtx); | |
1196 | return ret; | |
1197 | } | |
1198 | ||
1199 | static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, | |
1200 | size_t count, loff_t *pos) | |
1201 | { | |
1202 | struct rfkill *rfkill; | |
1203 | struct rfkill_event ev; | |
1948b2a2 | 1204 | int ret; |
c64fb016 JB |
1205 | |
1206 | /* we don't need the 'hard' variable but accept it */ | |
1be491fc | 1207 | if (count < RFKILL_EVENT_SIZE_V1 - 1) |
c64fb016 JB |
1208 | return -EINVAL; |
1209 | ||
1be491fc JB |
1210 | /* |
1211 | * Copy as much data as we can accept into our 'ev' buffer, | |
1212 | * but tell userspace how much we've copied so it can determine | |
1213 | * our API version even in a write() call, if it cares. | |
1214 | */ | |
1215 | count = min(count, sizeof(ev)); | |
1216 | if (copy_from_user(&ev, buf, count)) | |
c64fb016 JB |
1217 | return -EFAULT; |
1218 | ||
c64fb016 JB |
1219 | if (ev.type >= NUM_RFKILL_TYPES) |
1220 | return -EINVAL; | |
1221 | ||
1222 | mutex_lock(&rfkill_global_mutex); | |
1223 | ||
1948b2a2 JPRV |
1224 | switch (ev.op) { |
1225 | case RFKILL_OP_CHANGE_ALL: | |
9487bd6b | 1226 | rfkill_update_global_state(ev.type, ev.soft); |
1948b2a2 JPRV |
1227 | list_for_each_entry(rfkill, &rfkill_list, node) |
1228 | if (rfkill->type == ev.type || | |
1229 | ev.type == RFKILL_TYPE_ALL) | |
1230 | rfkill_set_block(rfkill, ev.soft); | |
1231 | ret = 0; | |
1232 | break; | |
1233 | case RFKILL_OP_CHANGE: | |
1234 | list_for_each_entry(rfkill, &rfkill_list, node) | |
1235 | if (rfkill->idx == ev.idx && | |
1236 | (rfkill->type == ev.type || | |
1237 | ev.type == RFKILL_TYPE_ALL)) | |
1238 | rfkill_set_block(rfkill, ev.soft); | |
1239 | ret = 0; | |
1240 | break; | |
1241 | default: | |
1242 | ret = -EINVAL; | |
1243 | break; | |
c64fb016 | 1244 | } |
1948b2a2 | 1245 | |
c64fb016 JB |
1246 | mutex_unlock(&rfkill_global_mutex); |
1247 | ||
1948b2a2 | 1248 | return ret ?: count; |
c64fb016 JB |
1249 | } |
1250 | ||
1251 | static int rfkill_fop_release(struct inode *inode, struct file *file) | |
1252 | { | |
1253 | struct rfkill_data *data = file->private_data; | |
1254 | struct rfkill_int_event *ev, *tmp; | |
1255 | ||
1256 | mutex_lock(&rfkill_global_mutex); | |
1257 | list_del(&data->list); | |
1258 | mutex_unlock(&rfkill_global_mutex); | |
1259 | ||
1260 | mutex_destroy(&data->mtx); | |
1261 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1262 | kfree(ev); | |
1263 | ||
1264 | #ifdef CONFIG_RFKILL_INPUT | |
1265 | if (data->input_handler) | |
207ee162 JB |
1266 | if (atomic_dec_return(&rfkill_input_disabled) == 0) |
1267 | printk(KERN_DEBUG "rfkill: input handler enabled\n"); | |
c64fb016 JB |
1268 | #endif |
1269 | ||
1270 | kfree(data); | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | #ifdef CONFIG_RFKILL_INPUT | |
1276 | static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, | |
1277 | unsigned long arg) | |
1278 | { | |
1279 | struct rfkill_data *data = file->private_data; | |
1280 | ||
1281 | if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) | |
1282 | return -ENOSYS; | |
1283 | ||
1284 | if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) | |
1285 | return -ENOSYS; | |
1286 | ||
1287 | mutex_lock(&data->mtx); | |
1288 | ||
1289 | if (!data->input_handler) { | |
207ee162 JB |
1290 | if (atomic_inc_return(&rfkill_input_disabled) == 1) |
1291 | printk(KERN_DEBUG "rfkill: input handler disabled\n"); | |
c64fb016 JB |
1292 | data->input_handler = true; |
1293 | } | |
1294 | ||
1295 | mutex_unlock(&data->mtx); | |
1296 | ||
1297 | return 0; | |
1298 | } | |
1299 | #endif | |
1300 | ||
1301 | static const struct file_operations rfkill_fops = { | |
45ba564d | 1302 | .owner = THIS_MODULE, |
c64fb016 JB |
1303 | .open = rfkill_fop_open, |
1304 | .read = rfkill_fop_read, | |
1305 | .write = rfkill_fop_write, | |
1306 | .poll = rfkill_fop_poll, | |
1307 | .release = rfkill_fop_release, | |
1308 | #ifdef CONFIG_RFKILL_INPUT | |
1309 | .unlocked_ioctl = rfkill_fop_ioctl, | |
1310 | .compat_ioctl = rfkill_fop_ioctl, | |
1311 | #endif | |
6038f373 | 1312 | .llseek = no_llseek, |
c64fb016 JB |
1313 | }; |
1314 | ||
1315 | static struct miscdevice rfkill_miscdev = { | |
1316 | .name = "rfkill", | |
1317 | .fops = &rfkill_fops, | |
1318 | .minor = MISC_DYNAMIC_MINOR, | |
1319 | }; | |
19d337df JB |
1320 | |
1321 | static int __init rfkill_init(void) | |
1322 | { | |
1323 | int error; | |
19d337df | 1324 | |
9487bd6b | 1325 | rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state); |
19d337df JB |
1326 | |
1327 | error = class_register(&rfkill_class); | |
1328 | if (error) | |
6124c53e | 1329 | goto error_class; |
19d337df | 1330 | |
c64fb016 | 1331 | error = misc_register(&rfkill_miscdev); |
6124c53e MK |
1332 | if (error) |
1333 | goto error_misc; | |
c64fb016 | 1334 | |
9b8e34e2 MK |
1335 | error = rfkill_any_led_trigger_register(); |
1336 | if (error) | |
1337 | goto error_led_trigger; | |
1338 | ||
19d337df JB |
1339 | #ifdef CONFIG_RFKILL_INPUT |
1340 | error = rfkill_handler_init(); | |
6124c53e MK |
1341 | if (error) |
1342 | goto error_input; | |
19d337df JB |
1343 | #endif |
1344 | ||
6124c53e MK |
1345 | return 0; |
1346 | ||
f6b4122c | 1347 | #ifdef CONFIG_RFKILL_INPUT |
6124c53e | 1348 | error_input: |
9b8e34e2 | 1349 | rfkill_any_led_trigger_unregister(); |
7b854982 | 1350 | #endif |
9b8e34e2 MK |
1351 | error_led_trigger: |
1352 | misc_deregister(&rfkill_miscdev); | |
6124c53e MK |
1353 | error_misc: |
1354 | class_unregister(&rfkill_class); | |
1355 | error_class: | |
19d337df JB |
1356 | return error; |
1357 | } | |
1358 | subsys_initcall(rfkill_init); | |
1359 | ||
1360 | static void __exit rfkill_exit(void) | |
1361 | { | |
1362 | #ifdef CONFIG_RFKILL_INPUT | |
1363 | rfkill_handler_exit(); | |
1364 | #endif | |
9b8e34e2 | 1365 | rfkill_any_led_trigger_unregister(); |
c64fb016 | 1366 | misc_deregister(&rfkill_miscdev); |
19d337df JB |
1367 | class_unregister(&rfkill_class); |
1368 | } | |
1369 | module_exit(rfkill_exit); |