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