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19d337df JB |
1 | /* |
2 | * Copyright (C) 2006 - 2007 Ivo van Doorn | |
3 | * Copyright (C) 2007 Dmitry Torokhov | |
4 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the | |
18 | * Free Software Foundation, Inc., | |
19 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/workqueue.h> | |
26 | #include <linux/capability.h> | |
27 | #include <linux/list.h> | |
28 | #include <linux/mutex.h> | |
29 | #include <linux/rfkill.h> | |
a99bbaf5 | 30 | #include <linux/sched.h> |
19d337df | 31 | #include <linux/spinlock.h> |
51990e82 | 32 | #include <linux/device.h> |
c64fb016 JB |
33 | #include <linux/miscdevice.h> |
34 | #include <linux/wait.h> | |
35 | #include <linux/poll.h> | |
36 | #include <linux/fs.h> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
19d337df JB |
38 | |
39 | #include "rfkill.h" | |
40 | ||
41 | #define POLL_INTERVAL (5 * HZ) | |
42 | ||
43 | #define RFKILL_BLOCK_HW BIT(0) | |
44 | #define RFKILL_BLOCK_SW BIT(1) | |
45 | #define RFKILL_BLOCK_SW_PREV BIT(2) | |
46 | #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\ | |
47 | RFKILL_BLOCK_SW |\ | |
48 | RFKILL_BLOCK_SW_PREV) | |
49 | #define RFKILL_BLOCK_SW_SETCALL BIT(31) | |
50 | ||
51 | struct rfkill { | |
52 | spinlock_t lock; | |
53 | ||
54 | const char *name; | |
55 | enum rfkill_type type; | |
56 | ||
57 | unsigned long state; | |
58 | ||
c64fb016 JB |
59 | u32 idx; |
60 | ||
19d337df | 61 | bool registered; |
b3fa1329 | 62 | bool persistent; |
19d337df JB |
63 | |
64 | const struct rfkill_ops *ops; | |
65 | void *data; | |
66 | ||
67 | #ifdef CONFIG_RFKILL_LEDS | |
68 | struct led_trigger led_trigger; | |
69 | const char *ledtrigname; | |
70 | #endif | |
71 | ||
72 | struct device dev; | |
73 | struct list_head node; | |
74 | ||
75 | struct delayed_work poll_work; | |
76 | struct work_struct uevent_work; | |
77 | struct work_struct sync_work; | |
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 | ||
238 | static bool __rfkill_set_hw_state(struct rfkill *rfkill, | |
239 | bool blocked, bool *change) | |
240 | { | |
241 | unsigned long flags; | |
242 | bool prev, any; | |
243 | ||
244 | BUG_ON(!rfkill); | |
245 | ||
246 | spin_lock_irqsave(&rfkill->lock, flags); | |
247 | prev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
248 | if (blocked) | |
249 | rfkill->state |= RFKILL_BLOCK_HW; | |
250 | else | |
251 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
252 | *change = prev != blocked; | |
6be19ccd | 253 | any = !!(rfkill->state & RFKILL_BLOCK_ANY); |
19d337df JB |
254 | spin_unlock_irqrestore(&rfkill->lock, flags); |
255 | ||
256 | rfkill_led_trigger_event(rfkill); | |
257 | ||
258 | return any; | |
259 | } | |
260 | ||
261 | /** | |
262 | * rfkill_set_block - wrapper for set_block method | |
263 | * | |
264 | * @rfkill: the rfkill struct to use | |
265 | * @blocked: the new software state | |
266 | * | |
267 | * Calls the set_block method (when applicable) and handles notifications | |
268 | * etc. as well. | |
269 | */ | |
270 | static void rfkill_set_block(struct rfkill *rfkill, bool blocked) | |
271 | { | |
272 | unsigned long flags; | |
eab48345 | 273 | bool prev, curr; |
19d337df JB |
274 | int err; |
275 | ||
7fa20a7f AJ |
276 | if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) |
277 | return; | |
278 | ||
19d337df JB |
279 | /* |
280 | * Some platforms (...!) generate input events which affect the | |
281 | * _hard_ kill state -- whenever something tries to change the | |
282 | * current software state query the hardware state too. | |
283 | */ | |
284 | if (rfkill->ops->query) | |
285 | rfkill->ops->query(rfkill, rfkill->data); | |
286 | ||
287 | spin_lock_irqsave(&rfkill->lock, flags); | |
eab48345 VW |
288 | prev = rfkill->state & RFKILL_BLOCK_SW; |
289 | ||
19d337df JB |
290 | if (rfkill->state & RFKILL_BLOCK_SW) |
291 | rfkill->state |= RFKILL_BLOCK_SW_PREV; | |
292 | else | |
293 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
294 | ||
295 | if (blocked) | |
296 | rfkill->state |= RFKILL_BLOCK_SW; | |
297 | else | |
298 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
299 | ||
300 | rfkill->state |= RFKILL_BLOCK_SW_SETCALL; | |
301 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
302 | ||
19d337df JB |
303 | err = rfkill->ops->set_block(rfkill->data, blocked); |
304 | ||
305 | spin_lock_irqsave(&rfkill->lock, flags); | |
306 | if (err) { | |
307 | /* | |
308 | * Failed -- reset status to _prev, this may be different | |
309 | * from what set set _PREV to earlier in this function | |
310 | * if rfkill_set_sw_state was invoked. | |
311 | */ | |
312 | if (rfkill->state & RFKILL_BLOCK_SW_PREV) | |
313 | rfkill->state |= RFKILL_BLOCK_SW; | |
314 | else | |
315 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
316 | } | |
317 | rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL; | |
318 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
eab48345 | 319 | curr = rfkill->state & RFKILL_BLOCK_SW; |
19d337df JB |
320 | spin_unlock_irqrestore(&rfkill->lock, flags); |
321 | ||
322 | rfkill_led_trigger_event(rfkill); | |
eab48345 VW |
323 | |
324 | if (prev != curr) | |
325 | rfkill_event(rfkill); | |
19d337df JB |
326 | } |
327 | ||
c64fb016 JB |
328 | #ifdef CONFIG_RFKILL_INPUT |
329 | static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); | |
330 | ||
19d337df JB |
331 | /** |
332 | * __rfkill_switch_all - Toggle state of all switches of given type | |
333 | * @type: type of interfaces to be affected | |
334 | * @state: the new state | |
335 | * | |
336 | * This function sets the state of all switches of given type, | |
337 | * unless a specific switch is claimed by userspace (in which case, | |
338 | * that switch is left alone) or suspended. | |
339 | * | |
340 | * Caller must have acquired rfkill_global_mutex. | |
341 | */ | |
342 | static void __rfkill_switch_all(const enum rfkill_type type, bool blocked) | |
343 | { | |
344 | struct rfkill *rfkill; | |
345 | ||
346 | rfkill_global_states[type].cur = blocked; | |
347 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
27e49ca9 | 348 | if (rfkill->type != type && type != RFKILL_TYPE_ALL) |
19d337df JB |
349 | continue; |
350 | ||
351 | rfkill_set_block(rfkill, blocked); | |
352 | } | |
353 | } | |
354 | ||
355 | /** | |
356 | * rfkill_switch_all - Toggle state of all switches of given type | |
357 | * @type: type of interfaces to be affected | |
358 | * @state: the new state | |
359 | * | |
360 | * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). | |
361 | * Please refer to __rfkill_switch_all() for details. | |
362 | * | |
363 | * Does nothing if the EPO lock is active. | |
364 | */ | |
365 | void rfkill_switch_all(enum rfkill_type type, bool blocked) | |
366 | { | |
c64fb016 JB |
367 | if (atomic_read(&rfkill_input_disabled)) |
368 | return; | |
369 | ||
19d337df JB |
370 | mutex_lock(&rfkill_global_mutex); |
371 | ||
372 | if (!rfkill_epo_lock_active) | |
373 | __rfkill_switch_all(type, blocked); | |
374 | ||
375 | mutex_unlock(&rfkill_global_mutex); | |
376 | } | |
377 | ||
378 | /** | |
379 | * rfkill_epo - emergency power off all transmitters | |
380 | * | |
381 | * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, | |
382 | * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. | |
383 | * | |
384 | * The global state before the EPO is saved and can be restored later | |
385 | * using rfkill_restore_states(). | |
386 | */ | |
387 | void rfkill_epo(void) | |
388 | { | |
389 | struct rfkill *rfkill; | |
390 | int i; | |
391 | ||
c64fb016 JB |
392 | if (atomic_read(&rfkill_input_disabled)) |
393 | return; | |
394 | ||
19d337df JB |
395 | mutex_lock(&rfkill_global_mutex); |
396 | ||
397 | rfkill_epo_lock_active = true; | |
398 | list_for_each_entry(rfkill, &rfkill_list, node) | |
399 | rfkill_set_block(rfkill, true); | |
400 | ||
401 | for (i = 0; i < NUM_RFKILL_TYPES; i++) { | |
b3fa1329 | 402 | rfkill_global_states[i].sav = rfkill_global_states[i].cur; |
19d337df JB |
403 | rfkill_global_states[i].cur = true; |
404 | } | |
c64fb016 | 405 | |
19d337df JB |
406 | mutex_unlock(&rfkill_global_mutex); |
407 | } | |
408 | ||
409 | /** | |
410 | * rfkill_restore_states - restore global states | |
411 | * | |
412 | * Restore (and sync switches to) the global state from the | |
413 | * states in rfkill_default_states. This can undo the effects of | |
414 | * a call to rfkill_epo(). | |
415 | */ | |
416 | void rfkill_restore_states(void) | |
417 | { | |
418 | int i; | |
419 | ||
c64fb016 JB |
420 | if (atomic_read(&rfkill_input_disabled)) |
421 | return; | |
422 | ||
19d337df JB |
423 | mutex_lock(&rfkill_global_mutex); |
424 | ||
425 | rfkill_epo_lock_active = false; | |
426 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 427 | __rfkill_switch_all(i, rfkill_global_states[i].sav); |
19d337df JB |
428 | mutex_unlock(&rfkill_global_mutex); |
429 | } | |
430 | ||
431 | /** | |
432 | * rfkill_remove_epo_lock - unlock state changes | |
433 | * | |
434 | * Used by rfkill-input manually unlock state changes, when | |
435 | * the EPO switch is deactivated. | |
436 | */ | |
437 | void rfkill_remove_epo_lock(void) | |
438 | { | |
c64fb016 JB |
439 | if (atomic_read(&rfkill_input_disabled)) |
440 | return; | |
441 | ||
19d337df JB |
442 | mutex_lock(&rfkill_global_mutex); |
443 | rfkill_epo_lock_active = false; | |
444 | mutex_unlock(&rfkill_global_mutex); | |
445 | } | |
446 | ||
447 | /** | |
448 | * rfkill_is_epo_lock_active - returns true EPO is active | |
449 | * | |
450 | * Returns 0 (false) if there is NOT an active EPO contidion, | |
451 | * and 1 (true) if there is an active EPO contition, which | |
452 | * locks all radios in one of the BLOCKED states. | |
453 | * | |
454 | * Can be called in atomic context. | |
455 | */ | |
456 | bool rfkill_is_epo_lock_active(void) | |
457 | { | |
458 | return rfkill_epo_lock_active; | |
459 | } | |
460 | ||
461 | /** | |
462 | * rfkill_get_global_sw_state - returns global state for a type | |
463 | * @type: the type to get the global state of | |
464 | * | |
465 | * Returns the current global state for a given wireless | |
466 | * device type. | |
467 | */ | |
468 | bool rfkill_get_global_sw_state(const enum rfkill_type type) | |
469 | { | |
470 | return rfkill_global_states[type].cur; | |
471 | } | |
c64fb016 | 472 | #endif |
19d337df | 473 | |
19d337df JB |
474 | |
475 | bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked) | |
476 | { | |
477 | bool ret, change; | |
478 | ||
479 | ret = __rfkill_set_hw_state(rfkill, blocked, &change); | |
480 | ||
481 | if (!rfkill->registered) | |
482 | return ret; | |
483 | ||
484 | if (change) | |
485 | schedule_work(&rfkill->uevent_work); | |
486 | ||
487 | return ret; | |
488 | } | |
489 | EXPORT_SYMBOL(rfkill_set_hw_state); | |
490 | ||
491 | static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
492 | { | |
493 | u32 bit = RFKILL_BLOCK_SW; | |
494 | ||
495 | /* if in a ops->set_block right now, use other bit */ | |
496 | if (rfkill->state & RFKILL_BLOCK_SW_SETCALL) | |
497 | bit = RFKILL_BLOCK_SW_PREV; | |
498 | ||
499 | if (blocked) | |
500 | rfkill->state |= bit; | |
501 | else | |
502 | rfkill->state &= ~bit; | |
503 | } | |
504 | ||
505 | bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
506 | { | |
507 | unsigned long flags; | |
508 | bool prev, hwblock; | |
509 | ||
510 | BUG_ON(!rfkill); | |
511 | ||
512 | spin_lock_irqsave(&rfkill->lock, flags); | |
513 | prev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
514 | __rfkill_set_sw_state(rfkill, blocked); | |
515 | hwblock = !!(rfkill->state & RFKILL_BLOCK_HW); | |
516 | blocked = blocked || hwblock; | |
517 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
518 | ||
06d5caf4 AJ |
519 | if (!rfkill->registered) |
520 | return blocked; | |
19d337df | 521 | |
06d5caf4 AJ |
522 | if (prev != blocked && !hwblock) |
523 | schedule_work(&rfkill->uevent_work); | |
524 | ||
525 | rfkill_led_trigger_event(rfkill); | |
19d337df JB |
526 | |
527 | return blocked; | |
528 | } | |
529 | EXPORT_SYMBOL(rfkill_set_sw_state); | |
530 | ||
06d5caf4 AJ |
531 | void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked) |
532 | { | |
533 | unsigned long flags; | |
534 | ||
535 | BUG_ON(!rfkill); | |
536 | BUG_ON(rfkill->registered); | |
537 | ||
538 | spin_lock_irqsave(&rfkill->lock, flags); | |
539 | __rfkill_set_sw_state(rfkill, blocked); | |
540 | rfkill->persistent = true; | |
541 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
542 | } | |
543 | EXPORT_SYMBOL(rfkill_init_sw_state); | |
544 | ||
19d337df JB |
545 | void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw) |
546 | { | |
547 | unsigned long flags; | |
548 | bool swprev, hwprev; | |
549 | ||
550 | BUG_ON(!rfkill); | |
551 | ||
552 | spin_lock_irqsave(&rfkill->lock, flags); | |
553 | ||
554 | /* | |
555 | * No need to care about prev/setblock ... this is for uevent only | |
556 | * and that will get triggered by rfkill_set_block anyway. | |
557 | */ | |
558 | swprev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
559 | hwprev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
560 | __rfkill_set_sw_state(rfkill, sw); | |
48ab3578 AJ |
561 | if (hw) |
562 | rfkill->state |= RFKILL_BLOCK_HW; | |
563 | else | |
564 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
19d337df JB |
565 | |
566 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
567 | ||
b3fa1329 AJ |
568 | if (!rfkill->registered) { |
569 | rfkill->persistent = true; | |
570 | } else { | |
571 | if (swprev != sw || hwprev != hw) | |
572 | schedule_work(&rfkill->uevent_work); | |
19d337df | 573 | |
b3fa1329 AJ |
574 | rfkill_led_trigger_event(rfkill); |
575 | } | |
19d337df JB |
576 | } |
577 | EXPORT_SYMBOL(rfkill_set_states); | |
578 | ||
e49df67d GKH |
579 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
580 | char *buf) | |
19d337df JB |
581 | { |
582 | struct rfkill *rfkill = to_rfkill(dev); | |
583 | ||
584 | return sprintf(buf, "%s\n", rfkill->name); | |
585 | } | |
e49df67d | 586 | static DEVICE_ATTR_RO(name); |
19d337df JB |
587 | |
588 | static const char *rfkill_get_type_str(enum rfkill_type type) | |
589 | { | |
44b3decb | 590 | BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_NFC + 1); |
02f7f179 | 591 | |
19d337df JB |
592 | switch (type) { |
593 | case RFKILL_TYPE_WLAN: | |
594 | return "wlan"; | |
595 | case RFKILL_TYPE_BLUETOOTH: | |
596 | return "bluetooth"; | |
597 | case RFKILL_TYPE_UWB: | |
598 | return "ultrawideband"; | |
599 | case RFKILL_TYPE_WIMAX: | |
600 | return "wimax"; | |
601 | case RFKILL_TYPE_WWAN: | |
602 | return "wwan"; | |
3ad20149 TW |
603 | case RFKILL_TYPE_GPS: |
604 | return "gps"; | |
875405a7 MH |
605 | case RFKILL_TYPE_FM: |
606 | return "fm"; | |
44b3decb SO |
607 | case RFKILL_TYPE_NFC: |
608 | return "nfc"; | |
19d337df JB |
609 | default: |
610 | BUG(); | |
611 | } | |
19d337df JB |
612 | } |
613 | ||
e49df67d GKH |
614 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
615 | char *buf) | |
19d337df JB |
616 | { |
617 | struct rfkill *rfkill = to_rfkill(dev); | |
618 | ||
619 | return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type)); | |
620 | } | |
e49df67d | 621 | static DEVICE_ATTR_RO(type); |
19d337df | 622 | |
e49df67d GKH |
623 | static ssize_t index_show(struct device *dev, struct device_attribute *attr, |
624 | char *buf) | |
c64fb016 JB |
625 | { |
626 | struct rfkill *rfkill = to_rfkill(dev); | |
627 | ||
628 | return sprintf(buf, "%d\n", rfkill->idx); | |
629 | } | |
e49df67d | 630 | static DEVICE_ATTR_RO(index); |
c64fb016 | 631 | |
e49df67d GKH |
632 | static ssize_t persistent_show(struct device *dev, |
633 | struct device_attribute *attr, char *buf) | |
464902e8 AJ |
634 | { |
635 | struct rfkill *rfkill = to_rfkill(dev); | |
636 | ||
637 | return sprintf(buf, "%d\n", rfkill->persistent); | |
638 | } | |
e49df67d | 639 | static DEVICE_ATTR_RO(persistent); |
464902e8 | 640 | |
e49df67d GKH |
641 | static ssize_t hard_show(struct device *dev, struct device_attribute *attr, |
642 | char *buf) | |
6c26361e | 643 | { |
644 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 645 | |
819bfecc | 646 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 ); |
6c26361e | 647 | } |
e49df67d | 648 | static DEVICE_ATTR_RO(hard); |
6c26361e | 649 | |
e49df67d GKH |
650 | static ssize_t soft_show(struct device *dev, struct device_attribute *attr, |
651 | char *buf) | |
6c26361e | 652 | { |
653 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 654 | |
819bfecc | 655 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 ); |
6c26361e | 656 | } |
657 | ||
e49df67d GKH |
658 | static ssize_t soft_store(struct device *dev, struct device_attribute *attr, |
659 | const char *buf, size_t count) | |
6c26361e | 660 | { |
661 | struct rfkill *rfkill = to_rfkill(dev); | |
662 | unsigned long state; | |
663 | int err; | |
664 | ||
665 | if (!capable(CAP_NET_ADMIN)) | |
666 | return -EPERM; | |
667 | ||
1bac92ca | 668 | err = kstrtoul(buf, 0, &state); |
6c26361e | 669 | if (err) |
670 | return err; | |
671 | ||
672 | if (state > 1 ) | |
673 | return -EINVAL; | |
674 | ||
675 | mutex_lock(&rfkill_global_mutex); | |
676 | rfkill_set_block(rfkill, state); | |
677 | mutex_unlock(&rfkill_global_mutex); | |
678 | ||
6f7c962c | 679 | return count; |
6c26361e | 680 | } |
e49df67d | 681 | static DEVICE_ATTR_RW(soft); |
6c26361e | 682 | |
19d337df JB |
683 | static u8 user_state_from_blocked(unsigned long state) |
684 | { | |
685 | if (state & RFKILL_BLOCK_HW) | |
686 | return RFKILL_USER_STATE_HARD_BLOCKED; | |
687 | if (state & RFKILL_BLOCK_SW) | |
688 | return RFKILL_USER_STATE_SOFT_BLOCKED; | |
689 | ||
690 | return RFKILL_USER_STATE_UNBLOCKED; | |
691 | } | |
692 | ||
e49df67d GKH |
693 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
694 | char *buf) | |
19d337df JB |
695 | { |
696 | struct rfkill *rfkill = to_rfkill(dev); | |
19d337df | 697 | |
819bfecc | 698 | return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state)); |
19d337df JB |
699 | } |
700 | ||
e49df67d GKH |
701 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
702 | const char *buf, size_t count) | |
19d337df | 703 | { |
f54c1427 JB |
704 | struct rfkill *rfkill = to_rfkill(dev); |
705 | unsigned long state; | |
706 | int err; | |
707 | ||
708 | if (!capable(CAP_NET_ADMIN)) | |
709 | return -EPERM; | |
710 | ||
1bac92ca | 711 | err = kstrtoul(buf, 0, &state); |
f54c1427 JB |
712 | if (err) |
713 | return err; | |
714 | ||
715 | if (state != RFKILL_USER_STATE_SOFT_BLOCKED && | |
716 | state != RFKILL_USER_STATE_UNBLOCKED) | |
717 | return -EINVAL; | |
718 | ||
719 | mutex_lock(&rfkill_global_mutex); | |
720 | rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); | |
721 | mutex_unlock(&rfkill_global_mutex); | |
19d337df | 722 | |
6f7c962c | 723 | return count; |
19d337df | 724 | } |
e49df67d | 725 | static DEVICE_ATTR_RW(state); |
19d337df | 726 | |
e49df67d GKH |
727 | static ssize_t claim_show(struct device *dev, struct device_attribute *attr, |
728 | char *buf) | |
19d337df JB |
729 | { |
730 | return sprintf(buf, "%d\n", 0); | |
731 | } | |
e49df67d GKH |
732 | static DEVICE_ATTR_RO(claim); |
733 | ||
734 | static struct attribute *rfkill_dev_attrs[] = { | |
735 | &dev_attr_name.attr, | |
736 | &dev_attr_type.attr, | |
737 | &dev_attr_index.attr, | |
738 | &dev_attr_persistent.attr, | |
739 | &dev_attr_state.attr, | |
740 | &dev_attr_claim.attr, | |
741 | &dev_attr_soft.attr, | |
742 | &dev_attr_hard.attr, | |
743 | NULL, | |
19d337df | 744 | }; |
e49df67d | 745 | ATTRIBUTE_GROUPS(rfkill_dev); |
19d337df JB |
746 | |
747 | static void rfkill_release(struct device *dev) | |
748 | { | |
749 | struct rfkill *rfkill = to_rfkill(dev); | |
750 | ||
751 | kfree(rfkill); | |
752 | } | |
753 | ||
754 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
755 | { | |
756 | struct rfkill *rfkill = to_rfkill(dev); | |
757 | unsigned long flags; | |
758 | u32 state; | |
759 | int error; | |
760 | ||
761 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); | |
762 | if (error) | |
763 | return error; | |
764 | error = add_uevent_var(env, "RFKILL_TYPE=%s", | |
765 | rfkill_get_type_str(rfkill->type)); | |
766 | if (error) | |
767 | return error; | |
768 | spin_lock_irqsave(&rfkill->lock, flags); | |
769 | state = rfkill->state; | |
770 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
771 | error = add_uevent_var(env, "RFKILL_STATE=%d", | |
772 | user_state_from_blocked(state)); | |
773 | return error; | |
774 | } | |
775 | ||
776 | void rfkill_pause_polling(struct rfkill *rfkill) | |
777 | { | |
778 | BUG_ON(!rfkill); | |
779 | ||
780 | if (!rfkill->ops->poll) | |
781 | return; | |
782 | ||
783 | cancel_delayed_work_sync(&rfkill->poll_work); | |
784 | } | |
785 | EXPORT_SYMBOL(rfkill_pause_polling); | |
786 | ||
787 | void rfkill_resume_polling(struct rfkill *rfkill) | |
788 | { | |
789 | BUG_ON(!rfkill); | |
790 | ||
791 | if (!rfkill->ops->poll) | |
792 | return; | |
793 | ||
794 | schedule_work(&rfkill->poll_work.work); | |
795 | } | |
796 | EXPORT_SYMBOL(rfkill_resume_polling); | |
797 | ||
798 | static int rfkill_suspend(struct device *dev, pm_message_t state) | |
799 | { | |
800 | struct rfkill *rfkill = to_rfkill(dev); | |
801 | ||
802 | rfkill_pause_polling(rfkill); | |
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 | ||
06d5caf4 AJ |
812 | if (!rfkill->persistent) { |
813 | cur = !!(rfkill->state & RFKILL_BLOCK_SW); | |
814 | rfkill_set_block(rfkill, cur); | |
815 | } | |
19d337df | 816 | |
19d337df JB |
817 | rfkill_resume_polling(rfkill); |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
822 | static struct class rfkill_class = { | |
823 | .name = "rfkill", | |
824 | .dev_release = rfkill_release, | |
e49df67d | 825 | .dev_groups = rfkill_dev_groups, |
19d337df JB |
826 | .dev_uevent = rfkill_dev_uevent, |
827 | .suspend = rfkill_suspend, | |
828 | .resume = rfkill_resume, | |
829 | }; | |
830 | ||
6081162e JB |
831 | bool rfkill_blocked(struct rfkill *rfkill) |
832 | { | |
833 | unsigned long flags; | |
834 | u32 state; | |
835 | ||
836 | spin_lock_irqsave(&rfkill->lock, flags); | |
837 | state = rfkill->state; | |
838 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
839 | ||
840 | return !!(state & RFKILL_BLOCK_ANY); | |
841 | } | |
842 | EXPORT_SYMBOL(rfkill_blocked); | |
843 | ||
19d337df JB |
844 | |
845 | struct rfkill * __must_check rfkill_alloc(const char *name, | |
846 | struct device *parent, | |
847 | const enum rfkill_type type, | |
848 | const struct rfkill_ops *ops, | |
849 | void *ops_data) | |
850 | { | |
851 | struct rfkill *rfkill; | |
852 | struct device *dev; | |
853 | ||
854 | if (WARN_ON(!ops)) | |
855 | return NULL; | |
856 | ||
857 | if (WARN_ON(!ops->set_block)) | |
858 | return NULL; | |
859 | ||
860 | if (WARN_ON(!name)) | |
861 | return NULL; | |
862 | ||
c64fb016 | 863 | if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) |
19d337df JB |
864 | return NULL; |
865 | ||
866 | rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL); | |
867 | if (!rfkill) | |
868 | return NULL; | |
869 | ||
870 | spin_lock_init(&rfkill->lock); | |
871 | INIT_LIST_HEAD(&rfkill->node); | |
872 | rfkill->type = type; | |
873 | rfkill->name = name; | |
874 | rfkill->ops = ops; | |
875 | rfkill->data = ops_data; | |
876 | ||
877 | dev = &rfkill->dev; | |
878 | dev->class = &rfkill_class; | |
879 | dev->parent = parent; | |
880 | device_initialize(dev); | |
881 | ||
882 | return rfkill; | |
883 | } | |
884 | EXPORT_SYMBOL(rfkill_alloc); | |
885 | ||
886 | static void rfkill_poll(struct work_struct *work) | |
887 | { | |
888 | struct rfkill *rfkill; | |
889 | ||
890 | rfkill = container_of(work, struct rfkill, poll_work.work); | |
891 | ||
892 | /* | |
893 | * Poll hardware state -- driver will use one of the | |
894 | * rfkill_set{,_hw,_sw}_state functions and use its | |
895 | * return value to update the current status. | |
896 | */ | |
897 | rfkill->ops->poll(rfkill, rfkill->data); | |
898 | ||
899 | schedule_delayed_work(&rfkill->poll_work, | |
900 | round_jiffies_relative(POLL_INTERVAL)); | |
901 | } | |
902 | ||
903 | static void rfkill_uevent_work(struct work_struct *work) | |
904 | { | |
905 | struct rfkill *rfkill; | |
906 | ||
907 | rfkill = container_of(work, struct rfkill, uevent_work); | |
908 | ||
c64fb016 JB |
909 | mutex_lock(&rfkill_global_mutex); |
910 | rfkill_event(rfkill); | |
911 | mutex_unlock(&rfkill_global_mutex); | |
19d337df JB |
912 | } |
913 | ||
914 | static void rfkill_sync_work(struct work_struct *work) | |
915 | { | |
916 | struct rfkill *rfkill; | |
917 | bool cur; | |
918 | ||
919 | rfkill = container_of(work, struct rfkill, sync_work); | |
920 | ||
921 | mutex_lock(&rfkill_global_mutex); | |
922 | cur = rfkill_global_states[rfkill->type].cur; | |
923 | rfkill_set_block(rfkill, cur); | |
924 | mutex_unlock(&rfkill_global_mutex); | |
925 | } | |
926 | ||
927 | int __must_check rfkill_register(struct rfkill *rfkill) | |
928 | { | |
929 | static unsigned long rfkill_no; | |
930 | struct device *dev = &rfkill->dev; | |
931 | int error; | |
932 | ||
933 | BUG_ON(!rfkill); | |
934 | ||
935 | mutex_lock(&rfkill_global_mutex); | |
936 | ||
937 | if (rfkill->registered) { | |
938 | error = -EALREADY; | |
939 | goto unlock; | |
940 | } | |
941 | ||
c64fb016 | 942 | rfkill->idx = rfkill_no; |
19d337df JB |
943 | dev_set_name(dev, "rfkill%lu", rfkill_no); |
944 | rfkill_no++; | |
945 | ||
19d337df JB |
946 | list_add_tail(&rfkill->node, &rfkill_list); |
947 | ||
948 | error = device_add(dev); | |
949 | if (error) | |
950 | goto remove; | |
951 | ||
952 | error = rfkill_led_trigger_register(rfkill); | |
953 | if (error) | |
954 | goto devdel; | |
955 | ||
956 | rfkill->registered = true; | |
957 | ||
2ec2c68c | 958 | INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); |
19d337df | 959 | INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); |
19d337df | 960 | INIT_WORK(&rfkill->sync_work, rfkill_sync_work); |
2ec2c68c JB |
961 | |
962 | if (rfkill->ops->poll) | |
963 | schedule_delayed_work(&rfkill->poll_work, | |
964 | round_jiffies_relative(POLL_INTERVAL)); | |
b3fa1329 AJ |
965 | |
966 | if (!rfkill->persistent || rfkill_epo_lock_active) { | |
967 | schedule_work(&rfkill->sync_work); | |
968 | } else { | |
969 | #ifdef CONFIG_RFKILL_INPUT | |
970 | bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); | |
971 | ||
972 | if (!atomic_read(&rfkill_input_disabled)) | |
973 | __rfkill_switch_all(rfkill->type, soft_blocked); | |
974 | #endif | |
975 | } | |
2ec2c68c | 976 | |
c64fb016 | 977 | rfkill_send_events(rfkill, RFKILL_OP_ADD); |
19d337df JB |
978 | |
979 | mutex_unlock(&rfkill_global_mutex); | |
980 | return 0; | |
981 | ||
982 | devdel: | |
983 | device_del(&rfkill->dev); | |
984 | remove: | |
985 | list_del_init(&rfkill->node); | |
986 | unlock: | |
987 | mutex_unlock(&rfkill_global_mutex); | |
988 | return error; | |
989 | } | |
990 | EXPORT_SYMBOL(rfkill_register); | |
991 | ||
992 | void rfkill_unregister(struct rfkill *rfkill) | |
993 | { | |
994 | BUG_ON(!rfkill); | |
995 | ||
996 | if (rfkill->ops->poll) | |
997 | cancel_delayed_work_sync(&rfkill->poll_work); | |
998 | ||
999 | cancel_work_sync(&rfkill->uevent_work); | |
1000 | cancel_work_sync(&rfkill->sync_work); | |
1001 | ||
1002 | rfkill->registered = false; | |
1003 | ||
1004 | device_del(&rfkill->dev); | |
1005 | ||
1006 | mutex_lock(&rfkill_global_mutex); | |
c64fb016 | 1007 | rfkill_send_events(rfkill, RFKILL_OP_DEL); |
19d337df JB |
1008 | list_del_init(&rfkill->node); |
1009 | mutex_unlock(&rfkill_global_mutex); | |
1010 | ||
1011 | rfkill_led_trigger_unregister(rfkill); | |
1012 | } | |
1013 | EXPORT_SYMBOL(rfkill_unregister); | |
1014 | ||
1015 | void rfkill_destroy(struct rfkill *rfkill) | |
1016 | { | |
1017 | if (rfkill) | |
1018 | put_device(&rfkill->dev); | |
1019 | } | |
1020 | EXPORT_SYMBOL(rfkill_destroy); | |
1021 | ||
c64fb016 JB |
1022 | static int rfkill_fop_open(struct inode *inode, struct file *file) |
1023 | { | |
1024 | struct rfkill_data *data; | |
1025 | struct rfkill *rfkill; | |
1026 | struct rfkill_int_event *ev, *tmp; | |
1027 | ||
1028 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1029 | if (!data) | |
1030 | return -ENOMEM; | |
1031 | ||
1032 | INIT_LIST_HEAD(&data->events); | |
1033 | mutex_init(&data->mtx); | |
1034 | init_waitqueue_head(&data->read_wait); | |
1035 | ||
1036 | mutex_lock(&rfkill_global_mutex); | |
1037 | mutex_lock(&data->mtx); | |
1038 | /* | |
1039 | * start getting events from elsewhere but hold mtx to get | |
1040 | * startup events added first | |
1041 | */ | |
c64fb016 JB |
1042 | |
1043 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1044 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
1045 | if (!ev) | |
1046 | goto free; | |
1047 | rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); | |
1048 | list_add_tail(&ev->list, &data->events); | |
1049 | } | |
bd2281b8 | 1050 | list_add(&data->list, &rfkill_fds); |
c64fb016 JB |
1051 | mutex_unlock(&data->mtx); |
1052 | mutex_unlock(&rfkill_global_mutex); | |
1053 | ||
1054 | file->private_data = data; | |
1055 | ||
1056 | return nonseekable_open(inode, file); | |
1057 | ||
1058 | free: | |
1059 | mutex_unlock(&data->mtx); | |
1060 | mutex_unlock(&rfkill_global_mutex); | |
1061 | mutex_destroy(&data->mtx); | |
1062 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1063 | kfree(ev); | |
1064 | kfree(data); | |
1065 | return -ENOMEM; | |
1066 | } | |
1067 | ||
1068 | static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait) | |
1069 | { | |
1070 | struct rfkill_data *data = file->private_data; | |
1071 | unsigned int res = POLLOUT | POLLWRNORM; | |
1072 | ||
1073 | poll_wait(file, &data->read_wait, wait); | |
1074 | ||
1075 | mutex_lock(&data->mtx); | |
1076 | if (!list_empty(&data->events)) | |
1077 | res = POLLIN | POLLRDNORM; | |
1078 | mutex_unlock(&data->mtx); | |
1079 | ||
1080 | return res; | |
1081 | } | |
1082 | ||
1083 | static bool rfkill_readable(struct rfkill_data *data) | |
1084 | { | |
1085 | bool r; | |
1086 | ||
1087 | mutex_lock(&data->mtx); | |
1088 | r = !list_empty(&data->events); | |
1089 | mutex_unlock(&data->mtx); | |
1090 | ||
1091 | return r; | |
1092 | } | |
1093 | ||
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); | |
1110 | ret = wait_event_interruptible(data->read_wait, | |
1111 | rfkill_readable(data)); | |
1112 | mutex_lock(&data->mtx); | |
1113 | ||
1114 | if (ret) | |
1115 | goto out; | |
1116 | } | |
1117 | ||
1118 | ev = list_first_entry(&data->events, struct rfkill_int_event, | |
1119 | list); | |
1120 | ||
1121 | sz = min_t(unsigned long, sizeof(ev->ev), count); | |
1122 | ret = sz; | |
1123 | if (copy_to_user(buf, &ev->ev, sz)) | |
1124 | ret = -EFAULT; | |
1125 | ||
1126 | list_del(&ev->list); | |
1127 | kfree(ev); | |
1128 | out: | |
1129 | mutex_unlock(&data->mtx); | |
1130 | return ret; | |
1131 | } | |
1132 | ||
1133 | static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, | |
1134 | size_t count, loff_t *pos) | |
1135 | { | |
1136 | struct rfkill *rfkill; | |
1137 | struct rfkill_event ev; | |
1138 | ||
1139 | /* we don't need the 'hard' variable but accept it */ | |
1be491fc | 1140 | if (count < RFKILL_EVENT_SIZE_V1 - 1) |
c64fb016 JB |
1141 | return -EINVAL; |
1142 | ||
1be491fc JB |
1143 | /* |
1144 | * Copy as much data as we can accept into our 'ev' buffer, | |
1145 | * but tell userspace how much we've copied so it can determine | |
1146 | * our API version even in a write() call, if it cares. | |
1147 | */ | |
1148 | count = min(count, sizeof(ev)); | |
1149 | if (copy_from_user(&ev, buf, count)) | |
c64fb016 JB |
1150 | return -EFAULT; |
1151 | ||
1152 | if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL) | |
1153 | return -EINVAL; | |
1154 | ||
1155 | if (ev.type >= NUM_RFKILL_TYPES) | |
1156 | return -EINVAL; | |
1157 | ||
1158 | mutex_lock(&rfkill_global_mutex); | |
1159 | ||
1160 | if (ev.op == RFKILL_OP_CHANGE_ALL) { | |
1161 | if (ev.type == RFKILL_TYPE_ALL) { | |
1162 | enum rfkill_type i; | |
1163 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
1164 | rfkill_global_states[i].cur = ev.soft; | |
1165 | } else { | |
1166 | rfkill_global_states[ev.type].cur = ev.soft; | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1171 | if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL) | |
1172 | continue; | |
1173 | ||
1174 | if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL) | |
1175 | continue; | |
1176 | ||
1177 | rfkill_set_block(rfkill, ev.soft); | |
1178 | } | |
1179 | mutex_unlock(&rfkill_global_mutex); | |
1180 | ||
1181 | return count; | |
1182 | } | |
1183 | ||
1184 | static int rfkill_fop_release(struct inode *inode, struct file *file) | |
1185 | { | |
1186 | struct rfkill_data *data = file->private_data; | |
1187 | struct rfkill_int_event *ev, *tmp; | |
1188 | ||
1189 | mutex_lock(&rfkill_global_mutex); | |
1190 | list_del(&data->list); | |
1191 | mutex_unlock(&rfkill_global_mutex); | |
1192 | ||
1193 | mutex_destroy(&data->mtx); | |
1194 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1195 | kfree(ev); | |
1196 | ||
1197 | #ifdef CONFIG_RFKILL_INPUT | |
1198 | if (data->input_handler) | |
207ee162 JB |
1199 | if (atomic_dec_return(&rfkill_input_disabled) == 0) |
1200 | printk(KERN_DEBUG "rfkill: input handler enabled\n"); | |
c64fb016 JB |
1201 | #endif |
1202 | ||
1203 | kfree(data); | |
1204 | ||
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | #ifdef CONFIG_RFKILL_INPUT | |
1209 | static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, | |
1210 | unsigned long arg) | |
1211 | { | |
1212 | struct rfkill_data *data = file->private_data; | |
1213 | ||
1214 | if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) | |
1215 | return -ENOSYS; | |
1216 | ||
1217 | if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) | |
1218 | return -ENOSYS; | |
1219 | ||
1220 | mutex_lock(&data->mtx); | |
1221 | ||
1222 | if (!data->input_handler) { | |
207ee162 JB |
1223 | if (atomic_inc_return(&rfkill_input_disabled) == 1) |
1224 | printk(KERN_DEBUG "rfkill: input handler disabled\n"); | |
c64fb016 JB |
1225 | data->input_handler = true; |
1226 | } | |
1227 | ||
1228 | mutex_unlock(&data->mtx); | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | #endif | |
1233 | ||
1234 | static const struct file_operations rfkill_fops = { | |
45ba564d | 1235 | .owner = THIS_MODULE, |
c64fb016 JB |
1236 | .open = rfkill_fop_open, |
1237 | .read = rfkill_fop_read, | |
1238 | .write = rfkill_fop_write, | |
1239 | .poll = rfkill_fop_poll, | |
1240 | .release = rfkill_fop_release, | |
1241 | #ifdef CONFIG_RFKILL_INPUT | |
1242 | .unlocked_ioctl = rfkill_fop_ioctl, | |
1243 | .compat_ioctl = rfkill_fop_ioctl, | |
1244 | #endif | |
6038f373 | 1245 | .llseek = no_llseek, |
c64fb016 JB |
1246 | }; |
1247 | ||
1248 | static struct miscdevice rfkill_miscdev = { | |
1249 | .name = "rfkill", | |
1250 | .fops = &rfkill_fops, | |
1251 | .minor = MISC_DYNAMIC_MINOR, | |
1252 | }; | |
19d337df JB |
1253 | |
1254 | static int __init rfkill_init(void) | |
1255 | { | |
1256 | int error; | |
1257 | int i; | |
1258 | ||
1259 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 1260 | rfkill_global_states[i].cur = !rfkill_default_state; |
19d337df JB |
1261 | |
1262 | error = class_register(&rfkill_class); | |
1263 | if (error) | |
1264 | goto out; | |
1265 | ||
c64fb016 JB |
1266 | error = misc_register(&rfkill_miscdev); |
1267 | if (error) { | |
1268 | class_unregister(&rfkill_class); | |
1269 | goto out; | |
1270 | } | |
1271 | ||
19d337df JB |
1272 | #ifdef CONFIG_RFKILL_INPUT |
1273 | error = rfkill_handler_init(); | |
c64fb016 JB |
1274 | if (error) { |
1275 | misc_deregister(&rfkill_miscdev); | |
19d337df | 1276 | class_unregister(&rfkill_class); |
c64fb016 JB |
1277 | goto out; |
1278 | } | |
19d337df JB |
1279 | #endif |
1280 | ||
1281 | out: | |
1282 | return error; | |
1283 | } | |
1284 | subsys_initcall(rfkill_init); | |
1285 | ||
1286 | static void __exit rfkill_exit(void) | |
1287 | { | |
1288 | #ifdef CONFIG_RFKILL_INPUT | |
1289 | rfkill_handler_exit(); | |
1290 | #endif | |
c64fb016 | 1291 | misc_deregister(&rfkill_miscdev); |
19d337df JB |
1292 | class_unregister(&rfkill_class); |
1293 | } | |
1294 | module_exit(rfkill_exit); |