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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; |
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; | |
b7bb1100 | 75 | char name[]; |
19d337df JB |
76 | }; |
77 | #define to_rfkill(d) container_of(d, struct rfkill, dev) | |
78 | ||
c64fb016 JB |
79 | struct rfkill_int_event { |
80 | struct list_head list; | |
81 | struct rfkill_event ev; | |
82 | }; | |
83 | ||
84 | struct rfkill_data { | |
85 | struct list_head list; | |
86 | struct list_head events; | |
87 | struct mutex mtx; | |
88 | wait_queue_head_t read_wait; | |
89 | bool input_handler; | |
90 | }; | |
19d337df JB |
91 | |
92 | ||
93 | MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); | |
94 | MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); | |
95 | MODULE_DESCRIPTION("RF switch support"); | |
96 | MODULE_LICENSE("GPL"); | |
97 | ||
98 | ||
99 | /* | |
100 | * The locking here should be made much smarter, we currently have | |
101 | * a bit of a stupid situation because drivers might want to register | |
102 | * the rfkill struct under their own lock, and take this lock during | |
103 | * rfkill method calls -- which will cause an AB-BA deadlock situation. | |
104 | * | |
105 | * To fix that, we need to rework this code here to be mostly lock-free | |
106 | * and only use the mutex for list manipulations, not to protect the | |
107 | * various other global variables. Then we can avoid holding the mutex | |
108 | * around driver operations, and all is happy. | |
109 | */ | |
110 | static LIST_HEAD(rfkill_list); /* list of registered rf switches */ | |
111 | static DEFINE_MUTEX(rfkill_global_mutex); | |
c64fb016 | 112 | static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */ |
19d337df JB |
113 | |
114 | static unsigned int rfkill_default_state = 1; | |
115 | module_param_named(default_state, rfkill_default_state, uint, 0444); | |
116 | MODULE_PARM_DESC(default_state, | |
117 | "Default initial state for all radio types, 0 = radio off"); | |
118 | ||
119 | static struct { | |
b3fa1329 | 120 | bool cur, sav; |
19d337df JB |
121 | } rfkill_global_states[NUM_RFKILL_TYPES]; |
122 | ||
19d337df JB |
123 | static bool rfkill_epo_lock_active; |
124 | ||
125 | ||
126 | #ifdef CONFIG_RFKILL_LEDS | |
127 | static void rfkill_led_trigger_event(struct rfkill *rfkill) | |
128 | { | |
129 | struct led_trigger *trigger; | |
130 | ||
131 | if (!rfkill->registered) | |
132 | return; | |
133 | ||
134 | trigger = &rfkill->led_trigger; | |
135 | ||
136 | if (rfkill->state & RFKILL_BLOCK_ANY) | |
137 | led_trigger_event(trigger, LED_OFF); | |
138 | else | |
139 | led_trigger_event(trigger, LED_FULL); | |
140 | } | |
141 | ||
142 | static void rfkill_led_trigger_activate(struct led_classdev *led) | |
143 | { | |
144 | struct rfkill *rfkill; | |
145 | ||
146 | rfkill = container_of(led->trigger, struct rfkill, led_trigger); | |
147 | ||
148 | rfkill_led_trigger_event(rfkill); | |
149 | } | |
150 | ||
06d7de83 AK |
151 | const char *rfkill_get_led_trigger_name(struct rfkill *rfkill) |
152 | { | |
153 | return rfkill->led_trigger.name; | |
154 | } | |
155 | EXPORT_SYMBOL(rfkill_get_led_trigger_name); | |
156 | ||
157 | void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name) | |
158 | { | |
159 | BUG_ON(!rfkill); | |
160 | ||
161 | rfkill->ledtrigname = name; | |
162 | } | |
163 | EXPORT_SYMBOL(rfkill_set_led_trigger_name); | |
164 | ||
19d337df JB |
165 | static int rfkill_led_trigger_register(struct rfkill *rfkill) |
166 | { | |
167 | rfkill->led_trigger.name = rfkill->ledtrigname | |
168 | ? : dev_name(&rfkill->dev); | |
169 | rfkill->led_trigger.activate = rfkill_led_trigger_activate; | |
170 | return led_trigger_register(&rfkill->led_trigger); | |
171 | } | |
172 | ||
173 | static void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
174 | { | |
175 | led_trigger_unregister(&rfkill->led_trigger); | |
176 | } | |
177 | #else | |
178 | static void rfkill_led_trigger_event(struct rfkill *rfkill) | |
179 | { | |
180 | } | |
181 | ||
182 | static inline int rfkill_led_trigger_register(struct rfkill *rfkill) | |
183 | { | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
188 | { | |
189 | } | |
190 | #endif /* CONFIG_RFKILL_LEDS */ | |
191 | ||
c64fb016 JB |
192 | static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill, |
193 | enum rfkill_operation op) | |
194 | { | |
195 | unsigned long flags; | |
196 | ||
197 | ev->idx = rfkill->idx; | |
198 | ev->type = rfkill->type; | |
199 | ev->op = op; | |
200 | ||
201 | spin_lock_irqsave(&rfkill->lock, flags); | |
202 | ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW); | |
203 | ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW | | |
204 | RFKILL_BLOCK_SW_PREV)); | |
205 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
206 | } | |
207 | ||
208 | static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op) | |
209 | { | |
210 | struct rfkill_data *data; | |
211 | struct rfkill_int_event *ev; | |
212 | ||
213 | list_for_each_entry(data, &rfkill_fds, list) { | |
214 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
215 | if (!ev) | |
216 | continue; | |
217 | rfkill_fill_event(&ev->ev, rfkill, op); | |
218 | mutex_lock(&data->mtx); | |
219 | list_add_tail(&ev->list, &data->events); | |
220 | mutex_unlock(&data->mtx); | |
221 | wake_up_interruptible(&data->read_wait); | |
222 | } | |
223 | } | |
224 | ||
225 | static void rfkill_event(struct rfkill *rfkill) | |
19d337df | 226 | { |
06d5caf4 | 227 | if (!rfkill->registered) |
19d337df JB |
228 | return; |
229 | ||
230 | kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); | |
c64fb016 JB |
231 | |
232 | /* also send event to /dev/rfkill */ | |
233 | rfkill_send_events(rfkill, RFKILL_OP_CHANGE); | |
19d337df JB |
234 | } |
235 | ||
236 | static bool __rfkill_set_hw_state(struct rfkill *rfkill, | |
237 | bool blocked, bool *change) | |
238 | { | |
239 | unsigned long flags; | |
240 | bool prev, any; | |
241 | ||
242 | BUG_ON(!rfkill); | |
243 | ||
244 | spin_lock_irqsave(&rfkill->lock, flags); | |
245 | prev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
246 | if (blocked) | |
247 | rfkill->state |= RFKILL_BLOCK_HW; | |
248 | else | |
249 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
250 | *change = prev != blocked; | |
6be19ccd | 251 | any = !!(rfkill->state & RFKILL_BLOCK_ANY); |
19d337df JB |
252 | spin_unlock_irqrestore(&rfkill->lock, flags); |
253 | ||
254 | rfkill_led_trigger_event(rfkill); | |
255 | ||
256 | return any; | |
257 | } | |
258 | ||
259 | /** | |
260 | * rfkill_set_block - wrapper for set_block method | |
261 | * | |
262 | * @rfkill: the rfkill struct to use | |
263 | * @blocked: the new software state | |
264 | * | |
265 | * Calls the set_block method (when applicable) and handles notifications | |
266 | * etc. as well. | |
267 | */ | |
268 | static void rfkill_set_block(struct rfkill *rfkill, bool blocked) | |
269 | { | |
270 | unsigned long flags; | |
eab48345 | 271 | bool prev, curr; |
19d337df JB |
272 | int err; |
273 | ||
7fa20a7f AJ |
274 | if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) |
275 | return; | |
276 | ||
19d337df JB |
277 | /* |
278 | * Some platforms (...!) generate input events which affect the | |
279 | * _hard_ kill state -- whenever something tries to change the | |
280 | * current software state query the hardware state too. | |
281 | */ | |
282 | if (rfkill->ops->query) | |
283 | rfkill->ops->query(rfkill, rfkill->data); | |
284 | ||
285 | spin_lock_irqsave(&rfkill->lock, flags); | |
eab48345 VW |
286 | prev = rfkill->state & RFKILL_BLOCK_SW; |
287 | ||
19d337df JB |
288 | if (rfkill->state & RFKILL_BLOCK_SW) |
289 | rfkill->state |= RFKILL_BLOCK_SW_PREV; | |
290 | else | |
291 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
292 | ||
293 | if (blocked) | |
294 | rfkill->state |= RFKILL_BLOCK_SW; | |
295 | else | |
296 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
297 | ||
298 | rfkill->state |= RFKILL_BLOCK_SW_SETCALL; | |
299 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
300 | ||
19d337df JB |
301 | err = rfkill->ops->set_block(rfkill->data, blocked); |
302 | ||
303 | spin_lock_irqsave(&rfkill->lock, flags); | |
304 | if (err) { | |
305 | /* | |
306 | * Failed -- reset status to _prev, this may be different | |
307 | * from what set set _PREV to earlier in this function | |
308 | * if rfkill_set_sw_state was invoked. | |
309 | */ | |
310 | if (rfkill->state & RFKILL_BLOCK_SW_PREV) | |
311 | rfkill->state |= RFKILL_BLOCK_SW; | |
312 | else | |
313 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
314 | } | |
315 | rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL; | |
316 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
eab48345 | 317 | curr = rfkill->state & RFKILL_BLOCK_SW; |
19d337df JB |
318 | spin_unlock_irqrestore(&rfkill->lock, flags); |
319 | ||
320 | rfkill_led_trigger_event(rfkill); | |
eab48345 VW |
321 | |
322 | if (prev != curr) | |
323 | rfkill_event(rfkill); | |
19d337df JB |
324 | } |
325 | ||
c64fb016 JB |
326 | #ifdef CONFIG_RFKILL_INPUT |
327 | static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); | |
328 | ||
19d337df JB |
329 | /** |
330 | * __rfkill_switch_all - Toggle state of all switches of given type | |
331 | * @type: type of interfaces to be affected | |
2f29fed3 | 332 | * @blocked: the new state |
19d337df JB |
333 | * |
334 | * This function sets the state of all switches of given type, | |
335 | * unless a specific switch is claimed by userspace (in which case, | |
336 | * that switch is left alone) or suspended. | |
337 | * | |
338 | * Caller must have acquired rfkill_global_mutex. | |
339 | */ | |
340 | static void __rfkill_switch_all(const enum rfkill_type type, bool blocked) | |
341 | { | |
342 | struct rfkill *rfkill; | |
343 | ||
4c077893 JPRV |
344 | if (type == RFKILL_TYPE_ALL) { |
345 | int i; | |
346 | ||
347 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
348 | rfkill_global_states[i].cur = blocked; | |
349 | } else { | |
350 | rfkill_global_states[type].cur = blocked; | |
351 | } | |
352 | ||
19d337df | 353 | list_for_each_entry(rfkill, &rfkill_list, node) { |
27e49ca9 | 354 | if (rfkill->type != type && type != RFKILL_TYPE_ALL) |
19d337df JB |
355 | continue; |
356 | ||
357 | rfkill_set_block(rfkill, blocked); | |
358 | } | |
359 | } | |
360 | ||
361 | /** | |
362 | * rfkill_switch_all - Toggle state of all switches of given type | |
363 | * @type: type of interfaces to be affected | |
2f29fed3 | 364 | * @blocked: the new state |
19d337df JB |
365 | * |
366 | * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). | |
367 | * Please refer to __rfkill_switch_all() for details. | |
368 | * | |
369 | * Does nothing if the EPO lock is active. | |
370 | */ | |
371 | void rfkill_switch_all(enum rfkill_type type, bool blocked) | |
372 | { | |
c64fb016 JB |
373 | if (atomic_read(&rfkill_input_disabled)) |
374 | return; | |
375 | ||
19d337df JB |
376 | mutex_lock(&rfkill_global_mutex); |
377 | ||
378 | if (!rfkill_epo_lock_active) | |
379 | __rfkill_switch_all(type, blocked); | |
380 | ||
381 | mutex_unlock(&rfkill_global_mutex); | |
382 | } | |
383 | ||
384 | /** | |
385 | * rfkill_epo - emergency power off all transmitters | |
386 | * | |
387 | * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, | |
388 | * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. | |
389 | * | |
390 | * The global state before the EPO is saved and can be restored later | |
391 | * using rfkill_restore_states(). | |
392 | */ | |
393 | void rfkill_epo(void) | |
394 | { | |
395 | struct rfkill *rfkill; | |
396 | int i; | |
397 | ||
c64fb016 JB |
398 | if (atomic_read(&rfkill_input_disabled)) |
399 | return; | |
400 | ||
19d337df JB |
401 | mutex_lock(&rfkill_global_mutex); |
402 | ||
403 | rfkill_epo_lock_active = true; | |
404 | list_for_each_entry(rfkill, &rfkill_list, node) | |
405 | rfkill_set_block(rfkill, true); | |
406 | ||
407 | for (i = 0; i < NUM_RFKILL_TYPES; i++) { | |
b3fa1329 | 408 | rfkill_global_states[i].sav = rfkill_global_states[i].cur; |
19d337df JB |
409 | rfkill_global_states[i].cur = true; |
410 | } | |
c64fb016 | 411 | |
19d337df JB |
412 | mutex_unlock(&rfkill_global_mutex); |
413 | } | |
414 | ||
415 | /** | |
416 | * rfkill_restore_states - restore global states | |
417 | * | |
418 | * Restore (and sync switches to) the global state from the | |
419 | * states in rfkill_default_states. This can undo the effects of | |
420 | * a call to rfkill_epo(). | |
421 | */ | |
422 | void rfkill_restore_states(void) | |
423 | { | |
424 | int i; | |
425 | ||
c64fb016 JB |
426 | if (atomic_read(&rfkill_input_disabled)) |
427 | return; | |
428 | ||
19d337df JB |
429 | mutex_lock(&rfkill_global_mutex); |
430 | ||
431 | rfkill_epo_lock_active = false; | |
432 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 433 | __rfkill_switch_all(i, rfkill_global_states[i].sav); |
19d337df JB |
434 | mutex_unlock(&rfkill_global_mutex); |
435 | } | |
436 | ||
437 | /** | |
438 | * rfkill_remove_epo_lock - unlock state changes | |
439 | * | |
440 | * Used by rfkill-input manually unlock state changes, when | |
441 | * the EPO switch is deactivated. | |
442 | */ | |
443 | void rfkill_remove_epo_lock(void) | |
444 | { | |
c64fb016 JB |
445 | if (atomic_read(&rfkill_input_disabled)) |
446 | return; | |
447 | ||
19d337df JB |
448 | mutex_lock(&rfkill_global_mutex); |
449 | rfkill_epo_lock_active = false; | |
450 | mutex_unlock(&rfkill_global_mutex); | |
451 | } | |
452 | ||
453 | /** | |
454 | * rfkill_is_epo_lock_active - returns true EPO is active | |
455 | * | |
456 | * Returns 0 (false) if there is NOT an active EPO contidion, | |
457 | * and 1 (true) if there is an active EPO contition, which | |
458 | * locks all radios in one of the BLOCKED states. | |
459 | * | |
460 | * Can be called in atomic context. | |
461 | */ | |
462 | bool rfkill_is_epo_lock_active(void) | |
463 | { | |
464 | return rfkill_epo_lock_active; | |
465 | } | |
466 | ||
467 | /** | |
468 | * rfkill_get_global_sw_state - returns global state for a type | |
469 | * @type: the type to get the global state of | |
470 | * | |
471 | * Returns the current global state for a given wireless | |
472 | * device type. | |
473 | */ | |
474 | bool rfkill_get_global_sw_state(const enum rfkill_type type) | |
475 | { | |
476 | return rfkill_global_states[type].cur; | |
477 | } | |
c64fb016 | 478 | #endif |
19d337df | 479 | |
19d337df JB |
480 | |
481 | bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked) | |
482 | { | |
483 | bool ret, change; | |
484 | ||
485 | ret = __rfkill_set_hw_state(rfkill, blocked, &change); | |
486 | ||
487 | if (!rfkill->registered) | |
488 | return ret; | |
489 | ||
490 | if (change) | |
491 | schedule_work(&rfkill->uevent_work); | |
492 | ||
493 | return ret; | |
494 | } | |
495 | EXPORT_SYMBOL(rfkill_set_hw_state); | |
496 | ||
497 | static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
498 | { | |
499 | u32 bit = RFKILL_BLOCK_SW; | |
500 | ||
501 | /* if in a ops->set_block right now, use other bit */ | |
502 | if (rfkill->state & RFKILL_BLOCK_SW_SETCALL) | |
503 | bit = RFKILL_BLOCK_SW_PREV; | |
504 | ||
505 | if (blocked) | |
506 | rfkill->state |= bit; | |
507 | else | |
508 | rfkill->state &= ~bit; | |
509 | } | |
510 | ||
511 | bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
512 | { | |
513 | unsigned long flags; | |
514 | bool prev, hwblock; | |
515 | ||
516 | BUG_ON(!rfkill); | |
517 | ||
518 | spin_lock_irqsave(&rfkill->lock, flags); | |
519 | prev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
520 | __rfkill_set_sw_state(rfkill, blocked); | |
521 | hwblock = !!(rfkill->state & RFKILL_BLOCK_HW); | |
522 | blocked = blocked || hwblock; | |
523 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
524 | ||
06d5caf4 AJ |
525 | if (!rfkill->registered) |
526 | return blocked; | |
19d337df | 527 | |
06d5caf4 AJ |
528 | if (prev != blocked && !hwblock) |
529 | schedule_work(&rfkill->uevent_work); | |
530 | ||
531 | rfkill_led_trigger_event(rfkill); | |
19d337df JB |
532 | |
533 | return blocked; | |
534 | } | |
535 | EXPORT_SYMBOL(rfkill_set_sw_state); | |
536 | ||
06d5caf4 AJ |
537 | void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked) |
538 | { | |
539 | unsigned long flags; | |
540 | ||
541 | BUG_ON(!rfkill); | |
542 | BUG_ON(rfkill->registered); | |
543 | ||
544 | spin_lock_irqsave(&rfkill->lock, flags); | |
545 | __rfkill_set_sw_state(rfkill, blocked); | |
546 | rfkill->persistent = true; | |
547 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
548 | } | |
549 | EXPORT_SYMBOL(rfkill_init_sw_state); | |
550 | ||
19d337df JB |
551 | void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw) |
552 | { | |
553 | unsigned long flags; | |
554 | bool swprev, hwprev; | |
555 | ||
556 | BUG_ON(!rfkill); | |
557 | ||
558 | spin_lock_irqsave(&rfkill->lock, flags); | |
559 | ||
560 | /* | |
561 | * No need to care about prev/setblock ... this is for uevent only | |
562 | * and that will get triggered by rfkill_set_block anyway. | |
563 | */ | |
564 | swprev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
565 | hwprev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
566 | __rfkill_set_sw_state(rfkill, sw); | |
48ab3578 AJ |
567 | if (hw) |
568 | rfkill->state |= RFKILL_BLOCK_HW; | |
569 | else | |
570 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
19d337df JB |
571 | |
572 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
573 | ||
b3fa1329 AJ |
574 | if (!rfkill->registered) { |
575 | rfkill->persistent = true; | |
576 | } else { | |
577 | if (swprev != sw || hwprev != hw) | |
578 | schedule_work(&rfkill->uevent_work); | |
19d337df | 579 | |
b3fa1329 AJ |
580 | rfkill_led_trigger_event(rfkill); |
581 | } | |
19d337df JB |
582 | } |
583 | EXPORT_SYMBOL(rfkill_set_states); | |
584 | ||
e49df67d GKH |
585 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
586 | char *buf) | |
19d337df JB |
587 | { |
588 | struct rfkill *rfkill = to_rfkill(dev); | |
589 | ||
590 | return sprintf(buf, "%s\n", rfkill->name); | |
591 | } | |
e49df67d | 592 | static DEVICE_ATTR_RO(name); |
19d337df JB |
593 | |
594 | static const char *rfkill_get_type_str(enum rfkill_type type) | |
595 | { | |
44b3decb | 596 | BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_NFC + 1); |
02f7f179 | 597 | |
19d337df JB |
598 | switch (type) { |
599 | case RFKILL_TYPE_WLAN: | |
600 | return "wlan"; | |
601 | case RFKILL_TYPE_BLUETOOTH: | |
602 | return "bluetooth"; | |
603 | case RFKILL_TYPE_UWB: | |
604 | return "ultrawideband"; | |
605 | case RFKILL_TYPE_WIMAX: | |
606 | return "wimax"; | |
607 | case RFKILL_TYPE_WWAN: | |
608 | return "wwan"; | |
3ad20149 TW |
609 | case RFKILL_TYPE_GPS: |
610 | return "gps"; | |
875405a7 MH |
611 | case RFKILL_TYPE_FM: |
612 | return "fm"; | |
44b3decb SO |
613 | case RFKILL_TYPE_NFC: |
614 | return "nfc"; | |
19d337df JB |
615 | default: |
616 | BUG(); | |
617 | } | |
19d337df JB |
618 | } |
619 | ||
e49df67d GKH |
620 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
621 | char *buf) | |
19d337df JB |
622 | { |
623 | struct rfkill *rfkill = to_rfkill(dev); | |
624 | ||
625 | return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type)); | |
626 | } | |
e49df67d | 627 | static DEVICE_ATTR_RO(type); |
19d337df | 628 | |
e49df67d GKH |
629 | static ssize_t index_show(struct device *dev, struct device_attribute *attr, |
630 | char *buf) | |
c64fb016 JB |
631 | { |
632 | struct rfkill *rfkill = to_rfkill(dev); | |
633 | ||
634 | return sprintf(buf, "%d\n", rfkill->idx); | |
635 | } | |
e49df67d | 636 | static DEVICE_ATTR_RO(index); |
c64fb016 | 637 | |
e49df67d GKH |
638 | static ssize_t persistent_show(struct device *dev, |
639 | struct device_attribute *attr, char *buf) | |
464902e8 AJ |
640 | { |
641 | struct rfkill *rfkill = to_rfkill(dev); | |
642 | ||
643 | return sprintf(buf, "%d\n", rfkill->persistent); | |
644 | } | |
e49df67d | 645 | static DEVICE_ATTR_RO(persistent); |
464902e8 | 646 | |
e49df67d GKH |
647 | static ssize_t hard_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_HW) ? 1 : 0 ); |
6c26361e | 653 | } |
e49df67d | 654 | static DEVICE_ATTR_RO(hard); |
6c26361e | 655 | |
e49df67d GKH |
656 | static ssize_t soft_show(struct device *dev, struct device_attribute *attr, |
657 | char *buf) | |
6c26361e | 658 | { |
659 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 660 | |
819bfecc | 661 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 ); |
6c26361e | 662 | } |
663 | ||
e49df67d GKH |
664 | static ssize_t soft_store(struct device *dev, struct device_attribute *attr, |
665 | const char *buf, size_t count) | |
6c26361e | 666 | { |
667 | struct rfkill *rfkill = to_rfkill(dev); | |
668 | unsigned long state; | |
669 | int err; | |
670 | ||
671 | if (!capable(CAP_NET_ADMIN)) | |
672 | return -EPERM; | |
673 | ||
1bac92ca | 674 | err = kstrtoul(buf, 0, &state); |
6c26361e | 675 | if (err) |
676 | return err; | |
677 | ||
678 | if (state > 1 ) | |
679 | return -EINVAL; | |
680 | ||
681 | mutex_lock(&rfkill_global_mutex); | |
682 | rfkill_set_block(rfkill, state); | |
683 | mutex_unlock(&rfkill_global_mutex); | |
684 | ||
6f7c962c | 685 | return count; |
6c26361e | 686 | } |
e49df67d | 687 | static DEVICE_ATTR_RW(soft); |
6c26361e | 688 | |
19d337df JB |
689 | static u8 user_state_from_blocked(unsigned long state) |
690 | { | |
691 | if (state & RFKILL_BLOCK_HW) | |
692 | return RFKILL_USER_STATE_HARD_BLOCKED; | |
693 | if (state & RFKILL_BLOCK_SW) | |
694 | return RFKILL_USER_STATE_SOFT_BLOCKED; | |
695 | ||
696 | return RFKILL_USER_STATE_UNBLOCKED; | |
697 | } | |
698 | ||
e49df67d GKH |
699 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
700 | char *buf) | |
19d337df JB |
701 | { |
702 | struct rfkill *rfkill = to_rfkill(dev); | |
19d337df | 703 | |
819bfecc | 704 | return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state)); |
19d337df JB |
705 | } |
706 | ||
e49df67d GKH |
707 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
708 | const char *buf, size_t count) | |
19d337df | 709 | { |
f54c1427 JB |
710 | struct rfkill *rfkill = to_rfkill(dev); |
711 | unsigned long state; | |
712 | int err; | |
713 | ||
714 | if (!capable(CAP_NET_ADMIN)) | |
715 | return -EPERM; | |
716 | ||
1bac92ca | 717 | err = kstrtoul(buf, 0, &state); |
f54c1427 JB |
718 | if (err) |
719 | return err; | |
720 | ||
721 | if (state != RFKILL_USER_STATE_SOFT_BLOCKED && | |
722 | state != RFKILL_USER_STATE_UNBLOCKED) | |
723 | return -EINVAL; | |
724 | ||
725 | mutex_lock(&rfkill_global_mutex); | |
726 | rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); | |
727 | mutex_unlock(&rfkill_global_mutex); | |
19d337df | 728 | |
6f7c962c | 729 | return count; |
19d337df | 730 | } |
e49df67d | 731 | static DEVICE_ATTR_RW(state); |
19d337df | 732 | |
e49df67d GKH |
733 | static ssize_t claim_show(struct device *dev, struct device_attribute *attr, |
734 | char *buf) | |
19d337df JB |
735 | { |
736 | return sprintf(buf, "%d\n", 0); | |
737 | } | |
e49df67d GKH |
738 | static DEVICE_ATTR_RO(claim); |
739 | ||
740 | static struct attribute *rfkill_dev_attrs[] = { | |
741 | &dev_attr_name.attr, | |
742 | &dev_attr_type.attr, | |
743 | &dev_attr_index.attr, | |
744 | &dev_attr_persistent.attr, | |
745 | &dev_attr_state.attr, | |
746 | &dev_attr_claim.attr, | |
747 | &dev_attr_soft.attr, | |
748 | &dev_attr_hard.attr, | |
749 | NULL, | |
19d337df | 750 | }; |
e49df67d | 751 | ATTRIBUTE_GROUPS(rfkill_dev); |
19d337df JB |
752 | |
753 | static void rfkill_release(struct device *dev) | |
754 | { | |
755 | struct rfkill *rfkill = to_rfkill(dev); | |
756 | ||
757 | kfree(rfkill); | |
758 | } | |
759 | ||
760 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
761 | { | |
762 | struct rfkill *rfkill = to_rfkill(dev); | |
763 | unsigned long flags; | |
764 | u32 state; | |
765 | int error; | |
766 | ||
767 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); | |
768 | if (error) | |
769 | return error; | |
770 | error = add_uevent_var(env, "RFKILL_TYPE=%s", | |
771 | rfkill_get_type_str(rfkill->type)); | |
772 | if (error) | |
773 | return error; | |
774 | spin_lock_irqsave(&rfkill->lock, flags); | |
775 | state = rfkill->state; | |
776 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
777 | error = add_uevent_var(env, "RFKILL_STATE=%d", | |
778 | user_state_from_blocked(state)); | |
779 | return error; | |
780 | } | |
781 | ||
782 | void rfkill_pause_polling(struct rfkill *rfkill) | |
783 | { | |
784 | BUG_ON(!rfkill); | |
785 | ||
786 | if (!rfkill->ops->poll) | |
787 | return; | |
788 | ||
789 | cancel_delayed_work_sync(&rfkill->poll_work); | |
790 | } | |
791 | EXPORT_SYMBOL(rfkill_pause_polling); | |
792 | ||
793 | void rfkill_resume_polling(struct rfkill *rfkill) | |
794 | { | |
795 | BUG_ON(!rfkill); | |
796 | ||
797 | if (!rfkill->ops->poll) | |
798 | return; | |
799 | ||
67235cbc SD |
800 | queue_delayed_work(system_power_efficient_wq, |
801 | &rfkill->poll_work, 0); | |
19d337df JB |
802 | } |
803 | EXPORT_SYMBOL(rfkill_resume_polling); | |
804 | ||
28f297a7 LPC |
805 | #ifdef CONFIG_PM_SLEEP |
806 | static int rfkill_suspend(struct device *dev) | |
19d337df JB |
807 | { |
808 | struct rfkill *rfkill = to_rfkill(dev); | |
809 | ||
810 | rfkill_pause_polling(rfkill); | |
811 | ||
19d337df JB |
812 | return 0; |
813 | } | |
814 | ||
815 | static int rfkill_resume(struct device *dev) | |
816 | { | |
817 | struct rfkill *rfkill = to_rfkill(dev); | |
818 | bool cur; | |
819 | ||
06d5caf4 AJ |
820 | if (!rfkill->persistent) { |
821 | cur = !!(rfkill->state & RFKILL_BLOCK_SW); | |
822 | rfkill_set_block(rfkill, cur); | |
823 | } | |
19d337df | 824 | |
19d337df JB |
825 | rfkill_resume_polling(rfkill); |
826 | ||
827 | return 0; | |
828 | } | |
829 | ||
28f297a7 LPC |
830 | static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume); |
831 | #define RFKILL_PM_OPS (&rfkill_pm_ops) | |
832 | #else | |
833 | #define RFKILL_PM_OPS NULL | |
834 | #endif | |
835 | ||
19d337df JB |
836 | static struct class rfkill_class = { |
837 | .name = "rfkill", | |
838 | .dev_release = rfkill_release, | |
e49df67d | 839 | .dev_groups = rfkill_dev_groups, |
19d337df | 840 | .dev_uevent = rfkill_dev_uevent, |
28f297a7 | 841 | .pm = RFKILL_PM_OPS, |
19d337df JB |
842 | }; |
843 | ||
6081162e JB |
844 | bool rfkill_blocked(struct rfkill *rfkill) |
845 | { | |
846 | unsigned long flags; | |
847 | u32 state; | |
848 | ||
849 | spin_lock_irqsave(&rfkill->lock, flags); | |
850 | state = rfkill->state; | |
851 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
852 | ||
853 | return !!(state & RFKILL_BLOCK_ANY); | |
854 | } | |
855 | EXPORT_SYMBOL(rfkill_blocked); | |
856 | ||
19d337df JB |
857 | |
858 | struct rfkill * __must_check rfkill_alloc(const char *name, | |
859 | struct device *parent, | |
860 | const enum rfkill_type type, | |
861 | const struct rfkill_ops *ops, | |
862 | void *ops_data) | |
863 | { | |
864 | struct rfkill *rfkill; | |
865 | struct device *dev; | |
866 | ||
867 | if (WARN_ON(!ops)) | |
868 | return NULL; | |
869 | ||
870 | if (WARN_ON(!ops->set_block)) | |
871 | return NULL; | |
872 | ||
873 | if (WARN_ON(!name)) | |
874 | return NULL; | |
875 | ||
c64fb016 | 876 | if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) |
19d337df JB |
877 | return NULL; |
878 | ||
b7bb1100 | 879 | rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL); |
19d337df JB |
880 | if (!rfkill) |
881 | return NULL; | |
882 | ||
883 | spin_lock_init(&rfkill->lock); | |
884 | INIT_LIST_HEAD(&rfkill->node); | |
885 | rfkill->type = type; | |
b7bb1100 | 886 | strcpy(rfkill->name, name); |
19d337df JB |
887 | rfkill->ops = ops; |
888 | rfkill->data = ops_data; | |
889 | ||
890 | dev = &rfkill->dev; | |
891 | dev->class = &rfkill_class; | |
892 | dev->parent = parent; | |
893 | device_initialize(dev); | |
894 | ||
895 | return rfkill; | |
896 | } | |
897 | EXPORT_SYMBOL(rfkill_alloc); | |
898 | ||
899 | static void rfkill_poll(struct work_struct *work) | |
900 | { | |
901 | struct rfkill *rfkill; | |
902 | ||
903 | rfkill = container_of(work, struct rfkill, poll_work.work); | |
904 | ||
905 | /* | |
906 | * Poll hardware state -- driver will use one of the | |
907 | * rfkill_set{,_hw,_sw}_state functions and use its | |
908 | * return value to update the current status. | |
909 | */ | |
910 | rfkill->ops->poll(rfkill, rfkill->data); | |
911 | ||
67235cbc SD |
912 | queue_delayed_work(system_power_efficient_wq, |
913 | &rfkill->poll_work, | |
19d337df JB |
914 | round_jiffies_relative(POLL_INTERVAL)); |
915 | } | |
916 | ||
917 | static void rfkill_uevent_work(struct work_struct *work) | |
918 | { | |
919 | struct rfkill *rfkill; | |
920 | ||
921 | rfkill = container_of(work, struct rfkill, uevent_work); | |
922 | ||
c64fb016 JB |
923 | mutex_lock(&rfkill_global_mutex); |
924 | rfkill_event(rfkill); | |
925 | mutex_unlock(&rfkill_global_mutex); | |
19d337df JB |
926 | } |
927 | ||
928 | static void rfkill_sync_work(struct work_struct *work) | |
929 | { | |
930 | struct rfkill *rfkill; | |
931 | bool cur; | |
932 | ||
933 | rfkill = container_of(work, struct rfkill, sync_work); | |
934 | ||
935 | mutex_lock(&rfkill_global_mutex); | |
936 | cur = rfkill_global_states[rfkill->type].cur; | |
937 | rfkill_set_block(rfkill, cur); | |
938 | mutex_unlock(&rfkill_global_mutex); | |
939 | } | |
940 | ||
941 | int __must_check rfkill_register(struct rfkill *rfkill) | |
942 | { | |
943 | static unsigned long rfkill_no; | |
944 | struct device *dev = &rfkill->dev; | |
945 | int error; | |
946 | ||
947 | BUG_ON(!rfkill); | |
948 | ||
949 | mutex_lock(&rfkill_global_mutex); | |
950 | ||
951 | if (rfkill->registered) { | |
952 | error = -EALREADY; | |
953 | goto unlock; | |
954 | } | |
955 | ||
c64fb016 | 956 | rfkill->idx = rfkill_no; |
19d337df JB |
957 | dev_set_name(dev, "rfkill%lu", rfkill_no); |
958 | rfkill_no++; | |
959 | ||
19d337df JB |
960 | list_add_tail(&rfkill->node, &rfkill_list); |
961 | ||
962 | error = device_add(dev); | |
963 | if (error) | |
964 | goto remove; | |
965 | ||
966 | error = rfkill_led_trigger_register(rfkill); | |
967 | if (error) | |
968 | goto devdel; | |
969 | ||
970 | rfkill->registered = true; | |
971 | ||
2ec2c68c | 972 | INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); |
19d337df | 973 | INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); |
19d337df | 974 | INIT_WORK(&rfkill->sync_work, rfkill_sync_work); |
2ec2c68c JB |
975 | |
976 | if (rfkill->ops->poll) | |
67235cbc SD |
977 | queue_delayed_work(system_power_efficient_wq, |
978 | &rfkill->poll_work, | |
2ec2c68c | 979 | round_jiffies_relative(POLL_INTERVAL)); |
b3fa1329 AJ |
980 | |
981 | if (!rfkill->persistent || rfkill_epo_lock_active) { | |
982 | schedule_work(&rfkill->sync_work); | |
983 | } else { | |
984 | #ifdef CONFIG_RFKILL_INPUT | |
985 | bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); | |
986 | ||
987 | if (!atomic_read(&rfkill_input_disabled)) | |
988 | __rfkill_switch_all(rfkill->type, soft_blocked); | |
989 | #endif | |
990 | } | |
2ec2c68c | 991 | |
c64fb016 | 992 | rfkill_send_events(rfkill, RFKILL_OP_ADD); |
19d337df JB |
993 | |
994 | mutex_unlock(&rfkill_global_mutex); | |
995 | return 0; | |
996 | ||
997 | devdel: | |
998 | device_del(&rfkill->dev); | |
999 | remove: | |
1000 | list_del_init(&rfkill->node); | |
1001 | unlock: | |
1002 | mutex_unlock(&rfkill_global_mutex); | |
1003 | return error; | |
1004 | } | |
1005 | EXPORT_SYMBOL(rfkill_register); | |
1006 | ||
1007 | void rfkill_unregister(struct rfkill *rfkill) | |
1008 | { | |
1009 | BUG_ON(!rfkill); | |
1010 | ||
1011 | if (rfkill->ops->poll) | |
1012 | cancel_delayed_work_sync(&rfkill->poll_work); | |
1013 | ||
1014 | cancel_work_sync(&rfkill->uevent_work); | |
1015 | cancel_work_sync(&rfkill->sync_work); | |
1016 | ||
1017 | rfkill->registered = false; | |
1018 | ||
1019 | device_del(&rfkill->dev); | |
1020 | ||
1021 | mutex_lock(&rfkill_global_mutex); | |
c64fb016 | 1022 | rfkill_send_events(rfkill, RFKILL_OP_DEL); |
19d337df JB |
1023 | list_del_init(&rfkill->node); |
1024 | mutex_unlock(&rfkill_global_mutex); | |
1025 | ||
1026 | rfkill_led_trigger_unregister(rfkill); | |
1027 | } | |
1028 | EXPORT_SYMBOL(rfkill_unregister); | |
1029 | ||
1030 | void rfkill_destroy(struct rfkill *rfkill) | |
1031 | { | |
1032 | if (rfkill) | |
1033 | put_device(&rfkill->dev); | |
1034 | } | |
1035 | EXPORT_SYMBOL(rfkill_destroy); | |
1036 | ||
c64fb016 JB |
1037 | static int rfkill_fop_open(struct inode *inode, struct file *file) |
1038 | { | |
1039 | struct rfkill_data *data; | |
1040 | struct rfkill *rfkill; | |
1041 | struct rfkill_int_event *ev, *tmp; | |
1042 | ||
1043 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1044 | if (!data) | |
1045 | return -ENOMEM; | |
1046 | ||
1047 | INIT_LIST_HEAD(&data->events); | |
1048 | mutex_init(&data->mtx); | |
1049 | init_waitqueue_head(&data->read_wait); | |
1050 | ||
1051 | mutex_lock(&rfkill_global_mutex); | |
1052 | mutex_lock(&data->mtx); | |
1053 | /* | |
1054 | * start getting events from elsewhere but hold mtx to get | |
1055 | * startup events added first | |
1056 | */ | |
c64fb016 JB |
1057 | |
1058 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1059 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
1060 | if (!ev) | |
1061 | goto free; | |
1062 | rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); | |
1063 | list_add_tail(&ev->list, &data->events); | |
1064 | } | |
bd2281b8 | 1065 | list_add(&data->list, &rfkill_fds); |
c64fb016 JB |
1066 | mutex_unlock(&data->mtx); |
1067 | mutex_unlock(&rfkill_global_mutex); | |
1068 | ||
1069 | file->private_data = data; | |
1070 | ||
1071 | return nonseekable_open(inode, file); | |
1072 | ||
1073 | free: | |
1074 | mutex_unlock(&data->mtx); | |
1075 | mutex_unlock(&rfkill_global_mutex); | |
1076 | mutex_destroy(&data->mtx); | |
1077 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1078 | kfree(ev); | |
1079 | kfree(data); | |
1080 | return -ENOMEM; | |
1081 | } | |
1082 | ||
1083 | static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait) | |
1084 | { | |
1085 | struct rfkill_data *data = file->private_data; | |
1086 | unsigned int res = POLLOUT | POLLWRNORM; | |
1087 | ||
1088 | poll_wait(file, &data->read_wait, wait); | |
1089 | ||
1090 | mutex_lock(&data->mtx); | |
1091 | if (!list_empty(&data->events)) | |
1092 | res = POLLIN | POLLRDNORM; | |
1093 | mutex_unlock(&data->mtx); | |
1094 | ||
1095 | return res; | |
1096 | } | |
1097 | ||
c64fb016 JB |
1098 | static ssize_t rfkill_fop_read(struct file *file, char __user *buf, |
1099 | size_t count, loff_t *pos) | |
1100 | { | |
1101 | struct rfkill_data *data = file->private_data; | |
1102 | struct rfkill_int_event *ev; | |
1103 | unsigned long sz; | |
1104 | int ret; | |
1105 | ||
1106 | mutex_lock(&data->mtx); | |
1107 | ||
1108 | while (list_empty(&data->events)) { | |
1109 | if (file->f_flags & O_NONBLOCK) { | |
1110 | ret = -EAGAIN; | |
1111 | goto out; | |
1112 | } | |
1113 | mutex_unlock(&data->mtx); | |
6736fde9 JB |
1114 | /* since we re-check and it just compares pointers, |
1115 | * using !list_empty() without locking isn't a problem | |
1116 | */ | |
c64fb016 | 1117 | ret = wait_event_interruptible(data->read_wait, |
6736fde9 | 1118 | !list_empty(&data->events)); |
c64fb016 JB |
1119 | mutex_lock(&data->mtx); |
1120 | ||
1121 | if (ret) | |
1122 | goto out; | |
1123 | } | |
1124 | ||
1125 | ev = list_first_entry(&data->events, struct rfkill_int_event, | |
1126 | list); | |
1127 | ||
1128 | sz = min_t(unsigned long, sizeof(ev->ev), count); | |
1129 | ret = sz; | |
1130 | if (copy_to_user(buf, &ev->ev, sz)) | |
1131 | ret = -EFAULT; | |
1132 | ||
1133 | list_del(&ev->list); | |
1134 | kfree(ev); | |
1135 | out: | |
1136 | mutex_unlock(&data->mtx); | |
1137 | return ret; | |
1138 | } | |
1139 | ||
1140 | static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, | |
1141 | size_t count, loff_t *pos) | |
1142 | { | |
1143 | struct rfkill *rfkill; | |
1144 | struct rfkill_event ev; | |
1145 | ||
1146 | /* we don't need the 'hard' variable but accept it */ | |
1be491fc | 1147 | if (count < RFKILL_EVENT_SIZE_V1 - 1) |
c64fb016 JB |
1148 | return -EINVAL; |
1149 | ||
1be491fc JB |
1150 | /* |
1151 | * Copy as much data as we can accept into our 'ev' buffer, | |
1152 | * but tell userspace how much we've copied so it can determine | |
1153 | * our API version even in a write() call, if it cares. | |
1154 | */ | |
1155 | count = min(count, sizeof(ev)); | |
1156 | if (copy_from_user(&ev, buf, count)) | |
c64fb016 JB |
1157 | return -EFAULT; |
1158 | ||
1159 | if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL) | |
1160 | return -EINVAL; | |
1161 | ||
1162 | if (ev.type >= NUM_RFKILL_TYPES) | |
1163 | return -EINVAL; | |
1164 | ||
1165 | mutex_lock(&rfkill_global_mutex); | |
1166 | ||
1167 | if (ev.op == RFKILL_OP_CHANGE_ALL) { | |
1168 | if (ev.type == RFKILL_TYPE_ALL) { | |
1169 | enum rfkill_type i; | |
1170 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
1171 | rfkill_global_states[i].cur = ev.soft; | |
1172 | } else { | |
1173 | rfkill_global_states[ev.type].cur = ev.soft; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1178 | if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL) | |
1179 | continue; | |
1180 | ||
1181 | if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL) | |
1182 | continue; | |
1183 | ||
1184 | rfkill_set_block(rfkill, ev.soft); | |
1185 | } | |
1186 | mutex_unlock(&rfkill_global_mutex); | |
1187 | ||
1188 | return count; | |
1189 | } | |
1190 | ||
1191 | static int rfkill_fop_release(struct inode *inode, struct file *file) | |
1192 | { | |
1193 | struct rfkill_data *data = file->private_data; | |
1194 | struct rfkill_int_event *ev, *tmp; | |
1195 | ||
1196 | mutex_lock(&rfkill_global_mutex); | |
1197 | list_del(&data->list); | |
1198 | mutex_unlock(&rfkill_global_mutex); | |
1199 | ||
1200 | mutex_destroy(&data->mtx); | |
1201 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1202 | kfree(ev); | |
1203 | ||
1204 | #ifdef CONFIG_RFKILL_INPUT | |
1205 | if (data->input_handler) | |
207ee162 JB |
1206 | if (atomic_dec_return(&rfkill_input_disabled) == 0) |
1207 | printk(KERN_DEBUG "rfkill: input handler enabled\n"); | |
c64fb016 JB |
1208 | #endif |
1209 | ||
1210 | kfree(data); | |
1211 | ||
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | #ifdef CONFIG_RFKILL_INPUT | |
1216 | static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, | |
1217 | unsigned long arg) | |
1218 | { | |
1219 | struct rfkill_data *data = file->private_data; | |
1220 | ||
1221 | if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) | |
1222 | return -ENOSYS; | |
1223 | ||
1224 | if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) | |
1225 | return -ENOSYS; | |
1226 | ||
1227 | mutex_lock(&data->mtx); | |
1228 | ||
1229 | if (!data->input_handler) { | |
207ee162 JB |
1230 | if (atomic_inc_return(&rfkill_input_disabled) == 1) |
1231 | printk(KERN_DEBUG "rfkill: input handler disabled\n"); | |
c64fb016 JB |
1232 | data->input_handler = true; |
1233 | } | |
1234 | ||
1235 | mutex_unlock(&data->mtx); | |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | #endif | |
1240 | ||
1241 | static const struct file_operations rfkill_fops = { | |
45ba564d | 1242 | .owner = THIS_MODULE, |
c64fb016 JB |
1243 | .open = rfkill_fop_open, |
1244 | .read = rfkill_fop_read, | |
1245 | .write = rfkill_fop_write, | |
1246 | .poll = rfkill_fop_poll, | |
1247 | .release = rfkill_fop_release, | |
1248 | #ifdef CONFIG_RFKILL_INPUT | |
1249 | .unlocked_ioctl = rfkill_fop_ioctl, | |
1250 | .compat_ioctl = rfkill_fop_ioctl, | |
1251 | #endif | |
6038f373 | 1252 | .llseek = no_llseek, |
c64fb016 JB |
1253 | }; |
1254 | ||
1255 | static struct miscdevice rfkill_miscdev = { | |
1256 | .name = "rfkill", | |
1257 | .fops = &rfkill_fops, | |
1258 | .minor = MISC_DYNAMIC_MINOR, | |
1259 | }; | |
19d337df JB |
1260 | |
1261 | static int __init rfkill_init(void) | |
1262 | { | |
1263 | int error; | |
1264 | int i; | |
1265 | ||
1266 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 1267 | rfkill_global_states[i].cur = !rfkill_default_state; |
19d337df JB |
1268 | |
1269 | error = class_register(&rfkill_class); | |
1270 | if (error) | |
1271 | goto out; | |
1272 | ||
c64fb016 JB |
1273 | error = misc_register(&rfkill_miscdev); |
1274 | if (error) { | |
1275 | class_unregister(&rfkill_class); | |
1276 | goto out; | |
1277 | } | |
1278 | ||
19d337df JB |
1279 | #ifdef CONFIG_RFKILL_INPUT |
1280 | error = rfkill_handler_init(); | |
c64fb016 JB |
1281 | if (error) { |
1282 | misc_deregister(&rfkill_miscdev); | |
19d337df | 1283 | class_unregister(&rfkill_class); |
c64fb016 JB |
1284 | goto out; |
1285 | } | |
19d337df JB |
1286 | #endif |
1287 | ||
1288 | out: | |
1289 | return error; | |
1290 | } | |
1291 | subsys_initcall(rfkill_init); | |
1292 | ||
1293 | static void __exit rfkill_exit(void) | |
1294 | { | |
1295 | #ifdef CONFIG_RFKILL_INPUT | |
1296 | rfkill_handler_exit(); | |
1297 | #endif | |
c64fb016 | 1298 | misc_deregister(&rfkill_miscdev); |
19d337df JB |
1299 | class_unregister(&rfkill_class); |
1300 | } | |
1301 | module_exit(rfkill_exit); |