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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
19d337df JB |
2 | /* |
3 | * Copyright (C) 2006 - 2007 Ivo van Doorn | |
4 | * Copyright (C) 2007 Dmitry Torokhov | |
5 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
19d337df JB |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/workqueue.h> | |
12 | #include <linux/capability.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/mutex.h> | |
15 | #include <linux/rfkill.h> | |
a99bbaf5 | 16 | #include <linux/sched.h> |
19d337df | 17 | #include <linux/spinlock.h> |
51990e82 | 18 | #include <linux/device.h> |
c64fb016 JB |
19 | #include <linux/miscdevice.h> |
20 | #include <linux/wait.h> | |
21 | #include <linux/poll.h> | |
22 | #include <linux/fs.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
19d337df JB |
24 | |
25 | #include "rfkill.h" | |
26 | ||
27 | #define POLL_INTERVAL (5 * HZ) | |
28 | ||
29 | #define RFKILL_BLOCK_HW BIT(0) | |
30 | #define RFKILL_BLOCK_SW BIT(1) | |
31 | #define RFKILL_BLOCK_SW_PREV BIT(2) | |
32 | #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\ | |
33 | RFKILL_BLOCK_SW |\ | |
34 | RFKILL_BLOCK_SW_PREV) | |
35 | #define RFKILL_BLOCK_SW_SETCALL BIT(31) | |
36 | ||
37 | struct rfkill { | |
38 | spinlock_t lock; | |
39 | ||
19d337df JB |
40 | enum rfkill_type type; |
41 | ||
42 | unsigned long state; | |
43 | ||
c64fb016 JB |
44 | u32 idx; |
45 | ||
19d337df | 46 | bool registered; |
b3fa1329 | 47 | bool persistent; |
dd21dfc6 JB |
48 | bool polling_paused; |
49 | bool suspended; | |
19d337df JB |
50 | |
51 | const struct rfkill_ops *ops; | |
52 | void *data; | |
53 | ||
54 | #ifdef CONFIG_RFKILL_LEDS | |
55 | struct led_trigger led_trigger; | |
56 | const char *ledtrigname; | |
57 | #endif | |
58 | ||
59 | struct device dev; | |
60 | struct list_head node; | |
61 | ||
62 | struct delayed_work poll_work; | |
63 | struct work_struct uevent_work; | |
64 | struct work_struct sync_work; | |
b7bb1100 | 65 | char name[]; |
19d337df JB |
66 | }; |
67 | #define to_rfkill(d) container_of(d, struct rfkill, dev) | |
68 | ||
c64fb016 JB |
69 | struct rfkill_int_event { |
70 | struct list_head list; | |
71 | struct rfkill_event ev; | |
72 | }; | |
73 | ||
74 | struct rfkill_data { | |
75 | struct list_head list; | |
76 | struct list_head events; | |
77 | struct mutex mtx; | |
78 | wait_queue_head_t read_wait; | |
79 | bool input_handler; | |
80 | }; | |
19d337df JB |
81 | |
82 | ||
83 | MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); | |
84 | MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); | |
85 | MODULE_DESCRIPTION("RF switch support"); | |
86 | MODULE_LICENSE("GPL"); | |
87 | ||
88 | ||
89 | /* | |
90 | * The locking here should be made much smarter, we currently have | |
91 | * a bit of a stupid situation because drivers might want to register | |
92 | * the rfkill struct under their own lock, and take this lock during | |
93 | * rfkill method calls -- which will cause an AB-BA deadlock situation. | |
94 | * | |
95 | * To fix that, we need to rework this code here to be mostly lock-free | |
96 | * and only use the mutex for list manipulations, not to protect the | |
97 | * various other global variables. Then we can avoid holding the mutex | |
98 | * around driver operations, and all is happy. | |
99 | */ | |
100 | static LIST_HEAD(rfkill_list); /* list of registered rf switches */ | |
101 | static DEFINE_MUTEX(rfkill_global_mutex); | |
c64fb016 | 102 | static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */ |
19d337df JB |
103 | |
104 | static unsigned int rfkill_default_state = 1; | |
105 | module_param_named(default_state, rfkill_default_state, uint, 0444); | |
106 | MODULE_PARM_DESC(default_state, | |
107 | "Default initial state for all radio types, 0 = radio off"); | |
108 | ||
109 | static struct { | |
b3fa1329 | 110 | bool cur, sav; |
19d337df JB |
111 | } rfkill_global_states[NUM_RFKILL_TYPES]; |
112 | ||
19d337df JB |
113 | static bool rfkill_epo_lock_active; |
114 | ||
115 | ||
116 | #ifdef CONFIG_RFKILL_LEDS | |
117 | static void rfkill_led_trigger_event(struct rfkill *rfkill) | |
118 | { | |
119 | struct led_trigger *trigger; | |
120 | ||
121 | if (!rfkill->registered) | |
122 | return; | |
123 | ||
124 | trigger = &rfkill->led_trigger; | |
125 | ||
126 | if (rfkill->state & RFKILL_BLOCK_ANY) | |
127 | led_trigger_event(trigger, LED_OFF); | |
128 | else | |
129 | led_trigger_event(trigger, LED_FULL); | |
130 | } | |
131 | ||
2282e125 | 132 | static int rfkill_led_trigger_activate(struct led_classdev *led) |
19d337df JB |
133 | { |
134 | struct rfkill *rfkill; | |
135 | ||
136 | rfkill = container_of(led->trigger, struct rfkill, led_trigger); | |
137 | ||
138 | rfkill_led_trigger_event(rfkill); | |
2282e125 UKK |
139 | |
140 | return 0; | |
19d337df JB |
141 | } |
142 | ||
06d7de83 AK |
143 | const char *rfkill_get_led_trigger_name(struct rfkill *rfkill) |
144 | { | |
145 | return rfkill->led_trigger.name; | |
146 | } | |
147 | EXPORT_SYMBOL(rfkill_get_led_trigger_name); | |
148 | ||
149 | void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name) | |
150 | { | |
151 | BUG_ON(!rfkill); | |
152 | ||
153 | rfkill->ledtrigname = name; | |
154 | } | |
155 | EXPORT_SYMBOL(rfkill_set_led_trigger_name); | |
156 | ||
19d337df JB |
157 | static int rfkill_led_trigger_register(struct rfkill *rfkill) |
158 | { | |
159 | rfkill->led_trigger.name = rfkill->ledtrigname | |
160 | ? : dev_name(&rfkill->dev); | |
161 | rfkill->led_trigger.activate = rfkill_led_trigger_activate; | |
162 | return led_trigger_register(&rfkill->led_trigger); | |
163 | } | |
164 | ||
165 | static void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
166 | { | |
167 | led_trigger_unregister(&rfkill->led_trigger); | |
168 | } | |
9b8e34e2 MK |
169 | |
170 | static struct led_trigger rfkill_any_led_trigger; | |
232aa23e | 171 | static struct led_trigger rfkill_none_led_trigger; |
d874cd74 | 172 | static struct work_struct rfkill_global_led_trigger_work; |
9b8e34e2 | 173 | |
d874cd74 | 174 | static void rfkill_global_led_trigger_worker(struct work_struct *work) |
9b8e34e2 MK |
175 | { |
176 | enum led_brightness brightness = LED_OFF; | |
177 | struct rfkill *rfkill; | |
178 | ||
179 | mutex_lock(&rfkill_global_mutex); | |
180 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
181 | if (!(rfkill->state & RFKILL_BLOCK_ANY)) { | |
182 | brightness = LED_FULL; | |
183 | break; | |
184 | } | |
185 | } | |
186 | mutex_unlock(&rfkill_global_mutex); | |
187 | ||
188 | led_trigger_event(&rfkill_any_led_trigger, brightness); | |
232aa23e JPRV |
189 | led_trigger_event(&rfkill_none_led_trigger, |
190 | brightness == LED_OFF ? LED_FULL : LED_OFF); | |
9b8e34e2 MK |
191 | } |
192 | ||
d874cd74 | 193 | static void rfkill_global_led_trigger_event(void) |
9b8e34e2 | 194 | { |
d874cd74 | 195 | schedule_work(&rfkill_global_led_trigger_work); |
9b8e34e2 MK |
196 | } |
197 | ||
d874cd74 | 198 | static int rfkill_global_led_trigger_register(void) |
9b8e34e2 | 199 | { |
232aa23e JPRV |
200 | int ret; |
201 | ||
d874cd74 JPRV |
202 | INIT_WORK(&rfkill_global_led_trigger_work, |
203 | rfkill_global_led_trigger_worker); | |
232aa23e | 204 | |
9b8e34e2 | 205 | rfkill_any_led_trigger.name = "rfkill-any"; |
232aa23e JPRV |
206 | ret = led_trigger_register(&rfkill_any_led_trigger); |
207 | if (ret) | |
208 | return ret; | |
209 | ||
210 | rfkill_none_led_trigger.name = "rfkill-none"; | |
211 | ret = led_trigger_register(&rfkill_none_led_trigger); | |
212 | if (ret) | |
213 | led_trigger_unregister(&rfkill_any_led_trigger); | |
214 | else | |
215 | /* Delay activation until all global triggers are registered */ | |
216 | rfkill_global_led_trigger_event(); | |
217 | ||
218 | return ret; | |
9b8e34e2 MK |
219 | } |
220 | ||
d874cd74 | 221 | static void rfkill_global_led_trigger_unregister(void) |
9b8e34e2 | 222 | { |
232aa23e | 223 | led_trigger_unregister(&rfkill_none_led_trigger); |
9b8e34e2 | 224 | led_trigger_unregister(&rfkill_any_led_trigger); |
d874cd74 | 225 | cancel_work_sync(&rfkill_global_led_trigger_work); |
9b8e34e2 | 226 | } |
19d337df JB |
227 | #else |
228 | static void rfkill_led_trigger_event(struct rfkill *rfkill) | |
229 | { | |
230 | } | |
231 | ||
232 | static inline int rfkill_led_trigger_register(struct rfkill *rfkill) | |
233 | { | |
234 | return 0; | |
235 | } | |
236 | ||
237 | static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill) | |
238 | { | |
239 | } | |
9b8e34e2 | 240 | |
d874cd74 | 241 | static void rfkill_global_led_trigger_event(void) |
9b8e34e2 MK |
242 | { |
243 | } | |
244 | ||
d874cd74 | 245 | static int rfkill_global_led_trigger_register(void) |
9b8e34e2 MK |
246 | { |
247 | return 0; | |
248 | } | |
249 | ||
d874cd74 | 250 | static void rfkill_global_led_trigger_unregister(void) |
9b8e34e2 MK |
251 | { |
252 | } | |
19d337df JB |
253 | #endif /* CONFIG_RFKILL_LEDS */ |
254 | ||
c64fb016 JB |
255 | static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill, |
256 | enum rfkill_operation op) | |
257 | { | |
258 | unsigned long flags; | |
259 | ||
260 | ev->idx = rfkill->idx; | |
261 | ev->type = rfkill->type; | |
262 | ev->op = op; | |
263 | ||
264 | spin_lock_irqsave(&rfkill->lock, flags); | |
265 | ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW); | |
266 | ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW | | |
267 | RFKILL_BLOCK_SW_PREV)); | |
268 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
269 | } | |
270 | ||
271 | static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op) | |
272 | { | |
273 | struct rfkill_data *data; | |
274 | struct rfkill_int_event *ev; | |
275 | ||
276 | list_for_each_entry(data, &rfkill_fds, list) { | |
277 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
278 | if (!ev) | |
279 | continue; | |
280 | rfkill_fill_event(&ev->ev, rfkill, op); | |
281 | mutex_lock(&data->mtx); | |
282 | list_add_tail(&ev->list, &data->events); | |
283 | mutex_unlock(&data->mtx); | |
284 | wake_up_interruptible(&data->read_wait); | |
285 | } | |
286 | } | |
287 | ||
288 | static void rfkill_event(struct rfkill *rfkill) | |
19d337df | 289 | { |
06d5caf4 | 290 | if (!rfkill->registered) |
19d337df JB |
291 | return; |
292 | ||
293 | kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); | |
c64fb016 JB |
294 | |
295 | /* also send event to /dev/rfkill */ | |
296 | rfkill_send_events(rfkill, RFKILL_OP_CHANGE); | |
19d337df JB |
297 | } |
298 | ||
19d337df JB |
299 | /** |
300 | * rfkill_set_block - wrapper for set_block method | |
301 | * | |
302 | * @rfkill: the rfkill struct to use | |
303 | * @blocked: the new software state | |
304 | * | |
305 | * Calls the set_block method (when applicable) and handles notifications | |
306 | * etc. as well. | |
307 | */ | |
308 | static void rfkill_set_block(struct rfkill *rfkill, bool blocked) | |
309 | { | |
310 | unsigned long flags; | |
eab48345 | 311 | bool prev, curr; |
19d337df JB |
312 | int err; |
313 | ||
7fa20a7f AJ |
314 | if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) |
315 | return; | |
316 | ||
19d337df JB |
317 | /* |
318 | * Some platforms (...!) generate input events which affect the | |
319 | * _hard_ kill state -- whenever something tries to change the | |
320 | * current software state query the hardware state too. | |
321 | */ | |
322 | if (rfkill->ops->query) | |
323 | rfkill->ops->query(rfkill, rfkill->data); | |
324 | ||
325 | spin_lock_irqsave(&rfkill->lock, flags); | |
eab48345 VW |
326 | prev = rfkill->state & RFKILL_BLOCK_SW; |
327 | ||
f3e7fae2 | 328 | if (prev) |
19d337df JB |
329 | rfkill->state |= RFKILL_BLOCK_SW_PREV; |
330 | else | |
331 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
332 | ||
333 | if (blocked) | |
334 | rfkill->state |= RFKILL_BLOCK_SW; | |
335 | else | |
336 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
337 | ||
338 | rfkill->state |= RFKILL_BLOCK_SW_SETCALL; | |
339 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
340 | ||
19d337df JB |
341 | err = rfkill->ops->set_block(rfkill->data, blocked); |
342 | ||
343 | spin_lock_irqsave(&rfkill->lock, flags); | |
344 | if (err) { | |
345 | /* | |
3ff707d6 JPRV |
346 | * Failed -- reset status to _PREV, which may be different |
347 | * from what we have set _PREV to earlier in this function | |
19d337df JB |
348 | * if rfkill_set_sw_state was invoked. |
349 | */ | |
350 | if (rfkill->state & RFKILL_BLOCK_SW_PREV) | |
351 | rfkill->state |= RFKILL_BLOCK_SW; | |
352 | else | |
353 | rfkill->state &= ~RFKILL_BLOCK_SW; | |
354 | } | |
355 | rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL; | |
356 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; | |
eab48345 | 357 | curr = rfkill->state & RFKILL_BLOCK_SW; |
19d337df JB |
358 | spin_unlock_irqrestore(&rfkill->lock, flags); |
359 | ||
360 | rfkill_led_trigger_event(rfkill); | |
d874cd74 | 361 | rfkill_global_led_trigger_event(); |
eab48345 VW |
362 | |
363 | if (prev != curr) | |
364 | rfkill_event(rfkill); | |
19d337df JB |
365 | } |
366 | ||
9487bd6b JPRV |
367 | static void rfkill_update_global_state(enum rfkill_type type, bool blocked) |
368 | { | |
369 | int i; | |
370 | ||
371 | if (type != RFKILL_TYPE_ALL) { | |
372 | rfkill_global_states[type].cur = blocked; | |
373 | return; | |
374 | } | |
375 | ||
376 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
377 | rfkill_global_states[i].cur = blocked; | |
378 | } | |
379 | ||
c64fb016 JB |
380 | #ifdef CONFIG_RFKILL_INPUT |
381 | static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); | |
382 | ||
19d337df JB |
383 | /** |
384 | * __rfkill_switch_all - Toggle state of all switches of given type | |
385 | * @type: type of interfaces to be affected | |
2f29fed3 | 386 | * @blocked: the new state |
19d337df JB |
387 | * |
388 | * This function sets the state of all switches of given type, | |
e2a35e89 | 389 | * unless a specific switch is suspended. |
19d337df JB |
390 | * |
391 | * Caller must have acquired rfkill_global_mutex. | |
392 | */ | |
393 | static void __rfkill_switch_all(const enum rfkill_type type, bool blocked) | |
394 | { | |
395 | struct rfkill *rfkill; | |
396 | ||
9487bd6b | 397 | rfkill_update_global_state(type, blocked); |
19d337df | 398 | list_for_each_entry(rfkill, &rfkill_list, node) { |
27e49ca9 | 399 | if (rfkill->type != type && type != RFKILL_TYPE_ALL) |
19d337df JB |
400 | continue; |
401 | ||
402 | rfkill_set_block(rfkill, blocked); | |
403 | } | |
404 | } | |
405 | ||
406 | /** | |
407 | * rfkill_switch_all - Toggle state of all switches of given type | |
408 | * @type: type of interfaces to be affected | |
2f29fed3 | 409 | * @blocked: the new state |
19d337df JB |
410 | * |
411 | * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). | |
412 | * Please refer to __rfkill_switch_all() for details. | |
413 | * | |
414 | * Does nothing if the EPO lock is active. | |
415 | */ | |
416 | void rfkill_switch_all(enum rfkill_type type, bool blocked) | |
417 | { | |
c64fb016 JB |
418 | if (atomic_read(&rfkill_input_disabled)) |
419 | return; | |
420 | ||
19d337df JB |
421 | mutex_lock(&rfkill_global_mutex); |
422 | ||
423 | if (!rfkill_epo_lock_active) | |
424 | __rfkill_switch_all(type, blocked); | |
425 | ||
426 | mutex_unlock(&rfkill_global_mutex); | |
427 | } | |
428 | ||
429 | /** | |
430 | * rfkill_epo - emergency power off all transmitters | |
431 | * | |
432 | * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, | |
433 | * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. | |
434 | * | |
435 | * The global state before the EPO is saved and can be restored later | |
436 | * using rfkill_restore_states(). | |
437 | */ | |
438 | void rfkill_epo(void) | |
439 | { | |
440 | struct rfkill *rfkill; | |
441 | int i; | |
442 | ||
c64fb016 JB |
443 | if (atomic_read(&rfkill_input_disabled)) |
444 | return; | |
445 | ||
19d337df JB |
446 | mutex_lock(&rfkill_global_mutex); |
447 | ||
448 | rfkill_epo_lock_active = true; | |
449 | list_for_each_entry(rfkill, &rfkill_list, node) | |
450 | rfkill_set_block(rfkill, true); | |
451 | ||
452 | for (i = 0; i < NUM_RFKILL_TYPES; i++) { | |
b3fa1329 | 453 | rfkill_global_states[i].sav = rfkill_global_states[i].cur; |
19d337df JB |
454 | rfkill_global_states[i].cur = true; |
455 | } | |
c64fb016 | 456 | |
19d337df JB |
457 | mutex_unlock(&rfkill_global_mutex); |
458 | } | |
459 | ||
460 | /** | |
461 | * rfkill_restore_states - restore global states | |
462 | * | |
463 | * Restore (and sync switches to) the global state from the | |
464 | * states in rfkill_default_states. This can undo the effects of | |
465 | * a call to rfkill_epo(). | |
466 | */ | |
467 | void rfkill_restore_states(void) | |
468 | { | |
469 | int i; | |
470 | ||
c64fb016 JB |
471 | if (atomic_read(&rfkill_input_disabled)) |
472 | return; | |
473 | ||
19d337df JB |
474 | mutex_lock(&rfkill_global_mutex); |
475 | ||
476 | rfkill_epo_lock_active = false; | |
477 | for (i = 0; i < NUM_RFKILL_TYPES; i++) | |
b3fa1329 | 478 | __rfkill_switch_all(i, rfkill_global_states[i].sav); |
19d337df JB |
479 | mutex_unlock(&rfkill_global_mutex); |
480 | } | |
481 | ||
482 | /** | |
483 | * rfkill_remove_epo_lock - unlock state changes | |
484 | * | |
485 | * Used by rfkill-input manually unlock state changes, when | |
486 | * the EPO switch is deactivated. | |
487 | */ | |
488 | void rfkill_remove_epo_lock(void) | |
489 | { | |
c64fb016 JB |
490 | if (atomic_read(&rfkill_input_disabled)) |
491 | return; | |
492 | ||
19d337df JB |
493 | mutex_lock(&rfkill_global_mutex); |
494 | rfkill_epo_lock_active = false; | |
495 | mutex_unlock(&rfkill_global_mutex); | |
496 | } | |
497 | ||
498 | /** | |
499 | * rfkill_is_epo_lock_active - returns true EPO is active | |
500 | * | |
f404c3ec RGB |
501 | * Returns 0 (false) if there is NOT an active EPO condition, |
502 | * and 1 (true) if there is an active EPO condition, which | |
19d337df JB |
503 | * locks all radios in one of the BLOCKED states. |
504 | * | |
505 | * Can be called in atomic context. | |
506 | */ | |
507 | bool rfkill_is_epo_lock_active(void) | |
508 | { | |
509 | return rfkill_epo_lock_active; | |
510 | } | |
511 | ||
512 | /** | |
513 | * rfkill_get_global_sw_state - returns global state for a type | |
514 | * @type: the type to get the global state of | |
515 | * | |
516 | * Returns the current global state for a given wireless | |
517 | * device type. | |
518 | */ | |
519 | bool rfkill_get_global_sw_state(const enum rfkill_type type) | |
520 | { | |
521 | return rfkill_global_states[type].cur; | |
522 | } | |
c64fb016 | 523 | #endif |
19d337df | 524 | |
19d337df JB |
525 | bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked) |
526 | { | |
1926e260 JPRV |
527 | unsigned long flags; |
528 | bool ret, prev; | |
529 | ||
530 | BUG_ON(!rfkill); | |
19d337df | 531 | |
1926e260 JPRV |
532 | spin_lock_irqsave(&rfkill->lock, flags); |
533 | prev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
534 | if (blocked) | |
535 | rfkill->state |= RFKILL_BLOCK_HW; | |
536 | else | |
537 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
538 | ret = !!(rfkill->state & RFKILL_BLOCK_ANY); | |
539 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
19d337df | 540 | |
1926e260 | 541 | rfkill_led_trigger_event(rfkill); |
d874cd74 | 542 | rfkill_global_led_trigger_event(); |
19d337df | 543 | |
74204f8f | 544 | if (rfkill->registered && prev != blocked) |
19d337df JB |
545 | schedule_work(&rfkill->uevent_work); |
546 | ||
547 | return ret; | |
548 | } | |
549 | EXPORT_SYMBOL(rfkill_set_hw_state); | |
550 | ||
551 | static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
552 | { | |
553 | u32 bit = RFKILL_BLOCK_SW; | |
554 | ||
555 | /* if in a ops->set_block right now, use other bit */ | |
556 | if (rfkill->state & RFKILL_BLOCK_SW_SETCALL) | |
557 | bit = RFKILL_BLOCK_SW_PREV; | |
558 | ||
559 | if (blocked) | |
560 | rfkill->state |= bit; | |
561 | else | |
562 | rfkill->state &= ~bit; | |
563 | } | |
564 | ||
565 | bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) | |
566 | { | |
567 | unsigned long flags; | |
568 | bool prev, hwblock; | |
569 | ||
570 | BUG_ON(!rfkill); | |
571 | ||
572 | spin_lock_irqsave(&rfkill->lock, flags); | |
573 | prev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
574 | __rfkill_set_sw_state(rfkill, blocked); | |
575 | hwblock = !!(rfkill->state & RFKILL_BLOCK_HW); | |
576 | blocked = blocked || hwblock; | |
577 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
578 | ||
06d5caf4 AJ |
579 | if (!rfkill->registered) |
580 | return blocked; | |
19d337df | 581 | |
06d5caf4 AJ |
582 | if (prev != blocked && !hwblock) |
583 | schedule_work(&rfkill->uevent_work); | |
584 | ||
585 | rfkill_led_trigger_event(rfkill); | |
d874cd74 | 586 | rfkill_global_led_trigger_event(); |
19d337df JB |
587 | |
588 | return blocked; | |
589 | } | |
590 | EXPORT_SYMBOL(rfkill_set_sw_state); | |
591 | ||
06d5caf4 AJ |
592 | void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked) |
593 | { | |
594 | unsigned long flags; | |
595 | ||
596 | BUG_ON(!rfkill); | |
597 | BUG_ON(rfkill->registered); | |
598 | ||
599 | spin_lock_irqsave(&rfkill->lock, flags); | |
600 | __rfkill_set_sw_state(rfkill, blocked); | |
601 | rfkill->persistent = true; | |
602 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
603 | } | |
604 | EXPORT_SYMBOL(rfkill_init_sw_state); | |
605 | ||
19d337df JB |
606 | void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw) |
607 | { | |
608 | unsigned long flags; | |
609 | bool swprev, hwprev; | |
610 | ||
611 | BUG_ON(!rfkill); | |
612 | ||
613 | spin_lock_irqsave(&rfkill->lock, flags); | |
614 | ||
615 | /* | |
616 | * No need to care about prev/setblock ... this is for uevent only | |
617 | * and that will get triggered by rfkill_set_block anyway. | |
618 | */ | |
619 | swprev = !!(rfkill->state & RFKILL_BLOCK_SW); | |
620 | hwprev = !!(rfkill->state & RFKILL_BLOCK_HW); | |
621 | __rfkill_set_sw_state(rfkill, sw); | |
48ab3578 AJ |
622 | if (hw) |
623 | rfkill->state |= RFKILL_BLOCK_HW; | |
624 | else | |
625 | rfkill->state &= ~RFKILL_BLOCK_HW; | |
19d337df JB |
626 | |
627 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
628 | ||
b3fa1329 AJ |
629 | if (!rfkill->registered) { |
630 | rfkill->persistent = true; | |
631 | } else { | |
632 | if (swprev != sw || hwprev != hw) | |
633 | schedule_work(&rfkill->uevent_work); | |
19d337df | 634 | |
b3fa1329 | 635 | rfkill_led_trigger_event(rfkill); |
d874cd74 | 636 | rfkill_global_led_trigger_event(); |
b3fa1329 | 637 | } |
19d337df JB |
638 | } |
639 | EXPORT_SYMBOL(rfkill_set_states); | |
640 | ||
648b50dd HK |
641 | static const char * const rfkill_types[] = { |
642 | NULL, /* RFKILL_TYPE_ALL */ | |
643 | "wlan", | |
644 | "bluetooth", | |
645 | "ultrawideband", | |
646 | "wimax", | |
647 | "wwan", | |
648 | "gps", | |
649 | "fm", | |
650 | "nfc", | |
651 | }; | |
652 | ||
653 | enum rfkill_type rfkill_find_type(const char *name) | |
654 | { | |
655 | int i; | |
656 | ||
657 | BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES); | |
658 | ||
659 | if (!name) | |
660 | return RFKILL_TYPE_ALL; | |
661 | ||
662 | for (i = 1; i < NUM_RFKILL_TYPES; i++) | |
663 | if (!strcmp(name, rfkill_types[i])) | |
664 | return i; | |
665 | return RFKILL_TYPE_ALL; | |
666 | } | |
667 | EXPORT_SYMBOL(rfkill_find_type); | |
668 | ||
e49df67d GKH |
669 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
670 | char *buf) | |
19d337df JB |
671 | { |
672 | struct rfkill *rfkill = to_rfkill(dev); | |
673 | ||
674 | return sprintf(buf, "%s\n", rfkill->name); | |
675 | } | |
e49df67d | 676 | static DEVICE_ATTR_RO(name); |
19d337df | 677 | |
e49df67d GKH |
678 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
679 | char *buf) | |
19d337df JB |
680 | { |
681 | struct rfkill *rfkill = to_rfkill(dev); | |
682 | ||
648b50dd | 683 | return sprintf(buf, "%s\n", rfkill_types[rfkill->type]); |
19d337df | 684 | } |
e49df67d | 685 | static DEVICE_ATTR_RO(type); |
19d337df | 686 | |
e49df67d GKH |
687 | static ssize_t index_show(struct device *dev, struct device_attribute *attr, |
688 | char *buf) | |
c64fb016 JB |
689 | { |
690 | struct rfkill *rfkill = to_rfkill(dev); | |
691 | ||
692 | return sprintf(buf, "%d\n", rfkill->idx); | |
693 | } | |
e49df67d | 694 | static DEVICE_ATTR_RO(index); |
c64fb016 | 695 | |
e49df67d GKH |
696 | static ssize_t persistent_show(struct device *dev, |
697 | struct device_attribute *attr, char *buf) | |
464902e8 AJ |
698 | { |
699 | struct rfkill *rfkill = to_rfkill(dev); | |
700 | ||
701 | return sprintf(buf, "%d\n", rfkill->persistent); | |
702 | } | |
e49df67d | 703 | static DEVICE_ATTR_RO(persistent); |
464902e8 | 704 | |
e49df67d GKH |
705 | static ssize_t hard_show(struct device *dev, struct device_attribute *attr, |
706 | char *buf) | |
6c26361e | 707 | { |
708 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 709 | |
819bfecc | 710 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 ); |
6c26361e | 711 | } |
e49df67d | 712 | static DEVICE_ATTR_RO(hard); |
6c26361e | 713 | |
e49df67d GKH |
714 | static ssize_t soft_show(struct device *dev, struct device_attribute *attr, |
715 | char *buf) | |
6c26361e | 716 | { |
717 | struct rfkill *rfkill = to_rfkill(dev); | |
6c26361e | 718 | |
819bfecc | 719 | return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 ); |
6c26361e | 720 | } |
721 | ||
e49df67d GKH |
722 | static ssize_t soft_store(struct device *dev, struct device_attribute *attr, |
723 | const char *buf, size_t count) | |
6c26361e | 724 | { |
725 | struct rfkill *rfkill = to_rfkill(dev); | |
726 | unsigned long state; | |
727 | int err; | |
728 | ||
729 | if (!capable(CAP_NET_ADMIN)) | |
730 | return -EPERM; | |
731 | ||
1bac92ca | 732 | err = kstrtoul(buf, 0, &state); |
6c26361e | 733 | if (err) |
734 | return err; | |
735 | ||
736 | if (state > 1 ) | |
737 | return -EINVAL; | |
738 | ||
739 | mutex_lock(&rfkill_global_mutex); | |
740 | rfkill_set_block(rfkill, state); | |
741 | mutex_unlock(&rfkill_global_mutex); | |
742 | ||
6f7c962c | 743 | return count; |
6c26361e | 744 | } |
e49df67d | 745 | static DEVICE_ATTR_RW(soft); |
6c26361e | 746 | |
19d337df JB |
747 | static u8 user_state_from_blocked(unsigned long state) |
748 | { | |
749 | if (state & RFKILL_BLOCK_HW) | |
750 | return RFKILL_USER_STATE_HARD_BLOCKED; | |
751 | if (state & RFKILL_BLOCK_SW) | |
752 | return RFKILL_USER_STATE_SOFT_BLOCKED; | |
753 | ||
754 | return RFKILL_USER_STATE_UNBLOCKED; | |
755 | } | |
756 | ||
e49df67d GKH |
757 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
758 | char *buf) | |
19d337df JB |
759 | { |
760 | struct rfkill *rfkill = to_rfkill(dev); | |
19d337df | 761 | |
819bfecc | 762 | return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state)); |
19d337df JB |
763 | } |
764 | ||
e49df67d GKH |
765 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
766 | const char *buf, size_t count) | |
19d337df | 767 | { |
f54c1427 JB |
768 | struct rfkill *rfkill = to_rfkill(dev); |
769 | unsigned long state; | |
770 | int err; | |
771 | ||
772 | if (!capable(CAP_NET_ADMIN)) | |
773 | return -EPERM; | |
774 | ||
1bac92ca | 775 | err = kstrtoul(buf, 0, &state); |
f54c1427 JB |
776 | if (err) |
777 | return err; | |
778 | ||
779 | if (state != RFKILL_USER_STATE_SOFT_BLOCKED && | |
780 | state != RFKILL_USER_STATE_UNBLOCKED) | |
781 | return -EINVAL; | |
782 | ||
783 | mutex_lock(&rfkill_global_mutex); | |
784 | rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); | |
785 | mutex_unlock(&rfkill_global_mutex); | |
19d337df | 786 | |
6f7c962c | 787 | return count; |
19d337df | 788 | } |
e49df67d | 789 | static DEVICE_ATTR_RW(state); |
19d337df | 790 | |
e49df67d GKH |
791 | static struct attribute *rfkill_dev_attrs[] = { |
792 | &dev_attr_name.attr, | |
793 | &dev_attr_type.attr, | |
794 | &dev_attr_index.attr, | |
795 | &dev_attr_persistent.attr, | |
796 | &dev_attr_state.attr, | |
e49df67d GKH |
797 | &dev_attr_soft.attr, |
798 | &dev_attr_hard.attr, | |
799 | NULL, | |
19d337df | 800 | }; |
e49df67d | 801 | ATTRIBUTE_GROUPS(rfkill_dev); |
19d337df JB |
802 | |
803 | static void rfkill_release(struct device *dev) | |
804 | { | |
805 | struct rfkill *rfkill = to_rfkill(dev); | |
806 | ||
807 | kfree(rfkill); | |
808 | } | |
809 | ||
810 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) | |
811 | { | |
812 | struct rfkill *rfkill = to_rfkill(dev); | |
813 | unsigned long flags; | |
814 | u32 state; | |
815 | int error; | |
816 | ||
817 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); | |
818 | if (error) | |
819 | return error; | |
820 | error = add_uevent_var(env, "RFKILL_TYPE=%s", | |
648b50dd | 821 | rfkill_types[rfkill->type]); |
19d337df JB |
822 | if (error) |
823 | return error; | |
824 | spin_lock_irqsave(&rfkill->lock, flags); | |
825 | state = rfkill->state; | |
826 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
827 | error = add_uevent_var(env, "RFKILL_STATE=%d", | |
828 | user_state_from_blocked(state)); | |
829 | return error; | |
830 | } | |
831 | ||
832 | void rfkill_pause_polling(struct rfkill *rfkill) | |
833 | { | |
834 | BUG_ON(!rfkill); | |
835 | ||
836 | if (!rfkill->ops->poll) | |
837 | return; | |
838 | ||
dd21dfc6 | 839 | rfkill->polling_paused = true; |
19d337df JB |
840 | cancel_delayed_work_sync(&rfkill->poll_work); |
841 | } | |
842 | EXPORT_SYMBOL(rfkill_pause_polling); | |
843 | ||
844 | void rfkill_resume_polling(struct rfkill *rfkill) | |
845 | { | |
846 | BUG_ON(!rfkill); | |
847 | ||
848 | if (!rfkill->ops->poll) | |
849 | return; | |
850 | ||
dd21dfc6 JB |
851 | rfkill->polling_paused = false; |
852 | ||
853 | if (rfkill->suspended) | |
854 | return; | |
855 | ||
67235cbc SD |
856 | queue_delayed_work(system_power_efficient_wq, |
857 | &rfkill->poll_work, 0); | |
19d337df JB |
858 | } |
859 | EXPORT_SYMBOL(rfkill_resume_polling); | |
860 | ||
28f297a7 LPC |
861 | #ifdef CONFIG_PM_SLEEP |
862 | static int rfkill_suspend(struct device *dev) | |
19d337df JB |
863 | { |
864 | struct rfkill *rfkill = to_rfkill(dev); | |
865 | ||
dd21dfc6 JB |
866 | rfkill->suspended = true; |
867 | cancel_delayed_work_sync(&rfkill->poll_work); | |
19d337df | 868 | |
19d337df JB |
869 | return 0; |
870 | } | |
871 | ||
872 | static int rfkill_resume(struct device *dev) | |
873 | { | |
874 | struct rfkill *rfkill = to_rfkill(dev); | |
875 | bool cur; | |
876 | ||
dd21dfc6 JB |
877 | rfkill->suspended = false; |
878 | ||
06d5caf4 AJ |
879 | if (!rfkill->persistent) { |
880 | cur = !!(rfkill->state & RFKILL_BLOCK_SW); | |
881 | rfkill_set_block(rfkill, cur); | |
882 | } | |
19d337df | 883 | |
dd21dfc6 JB |
884 | if (rfkill->ops->poll && !rfkill->polling_paused) |
885 | queue_delayed_work(system_power_efficient_wq, | |
886 | &rfkill->poll_work, 0); | |
19d337df JB |
887 | |
888 | return 0; | |
889 | } | |
890 | ||
28f297a7 LPC |
891 | static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume); |
892 | #define RFKILL_PM_OPS (&rfkill_pm_ops) | |
893 | #else | |
894 | #define RFKILL_PM_OPS NULL | |
895 | #endif | |
896 | ||
19d337df JB |
897 | static struct class rfkill_class = { |
898 | .name = "rfkill", | |
899 | .dev_release = rfkill_release, | |
e49df67d | 900 | .dev_groups = rfkill_dev_groups, |
19d337df | 901 | .dev_uevent = rfkill_dev_uevent, |
28f297a7 | 902 | .pm = RFKILL_PM_OPS, |
19d337df JB |
903 | }; |
904 | ||
6081162e JB |
905 | bool rfkill_blocked(struct rfkill *rfkill) |
906 | { | |
907 | unsigned long flags; | |
908 | u32 state; | |
909 | ||
910 | spin_lock_irqsave(&rfkill->lock, flags); | |
911 | state = rfkill->state; | |
912 | spin_unlock_irqrestore(&rfkill->lock, flags); | |
913 | ||
914 | return !!(state & RFKILL_BLOCK_ANY); | |
915 | } | |
916 | EXPORT_SYMBOL(rfkill_blocked); | |
917 | ||
19d337df JB |
918 | |
919 | struct rfkill * __must_check rfkill_alloc(const char *name, | |
920 | struct device *parent, | |
921 | const enum rfkill_type type, | |
922 | const struct rfkill_ops *ops, | |
923 | void *ops_data) | |
924 | { | |
925 | struct rfkill *rfkill; | |
926 | struct device *dev; | |
927 | ||
928 | if (WARN_ON(!ops)) | |
929 | return NULL; | |
930 | ||
931 | if (WARN_ON(!ops->set_block)) | |
932 | return NULL; | |
933 | ||
934 | if (WARN_ON(!name)) | |
935 | return NULL; | |
936 | ||
c64fb016 | 937 | if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) |
19d337df JB |
938 | return NULL; |
939 | ||
b7bb1100 | 940 | rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL); |
19d337df JB |
941 | if (!rfkill) |
942 | return NULL; | |
943 | ||
944 | spin_lock_init(&rfkill->lock); | |
945 | INIT_LIST_HEAD(&rfkill->node); | |
946 | rfkill->type = type; | |
b7bb1100 | 947 | strcpy(rfkill->name, name); |
19d337df JB |
948 | rfkill->ops = ops; |
949 | rfkill->data = ops_data; | |
950 | ||
951 | dev = &rfkill->dev; | |
952 | dev->class = &rfkill_class; | |
953 | dev->parent = parent; | |
954 | device_initialize(dev); | |
955 | ||
956 | return rfkill; | |
957 | } | |
958 | EXPORT_SYMBOL(rfkill_alloc); | |
959 | ||
960 | static void rfkill_poll(struct work_struct *work) | |
961 | { | |
962 | struct rfkill *rfkill; | |
963 | ||
964 | rfkill = container_of(work, struct rfkill, poll_work.work); | |
965 | ||
966 | /* | |
967 | * Poll hardware state -- driver will use one of the | |
968 | * rfkill_set{,_hw,_sw}_state functions and use its | |
969 | * return value to update the current status. | |
970 | */ | |
971 | rfkill->ops->poll(rfkill, rfkill->data); | |
972 | ||
67235cbc SD |
973 | queue_delayed_work(system_power_efficient_wq, |
974 | &rfkill->poll_work, | |
19d337df JB |
975 | round_jiffies_relative(POLL_INTERVAL)); |
976 | } | |
977 | ||
978 | static void rfkill_uevent_work(struct work_struct *work) | |
979 | { | |
980 | struct rfkill *rfkill; | |
981 | ||
982 | rfkill = container_of(work, struct rfkill, uevent_work); | |
983 | ||
c64fb016 JB |
984 | mutex_lock(&rfkill_global_mutex); |
985 | rfkill_event(rfkill); | |
986 | mutex_unlock(&rfkill_global_mutex); | |
19d337df JB |
987 | } |
988 | ||
989 | static void rfkill_sync_work(struct work_struct *work) | |
990 | { | |
991 | struct rfkill *rfkill; | |
992 | bool cur; | |
993 | ||
994 | rfkill = container_of(work, struct rfkill, sync_work); | |
995 | ||
996 | mutex_lock(&rfkill_global_mutex); | |
997 | cur = rfkill_global_states[rfkill->type].cur; | |
998 | rfkill_set_block(rfkill, cur); | |
999 | mutex_unlock(&rfkill_global_mutex); | |
1000 | } | |
1001 | ||
1002 | int __must_check rfkill_register(struct rfkill *rfkill) | |
1003 | { | |
1004 | static unsigned long rfkill_no; | |
6fc232db | 1005 | struct device *dev; |
19d337df JB |
1006 | int error; |
1007 | ||
6fc232db AP |
1008 | if (!rfkill) |
1009 | return -EINVAL; | |
1010 | ||
1011 | dev = &rfkill->dev; | |
19d337df JB |
1012 | |
1013 | mutex_lock(&rfkill_global_mutex); | |
1014 | ||
1015 | if (rfkill->registered) { | |
1016 | error = -EALREADY; | |
1017 | goto unlock; | |
1018 | } | |
1019 | ||
c64fb016 | 1020 | rfkill->idx = rfkill_no; |
19d337df JB |
1021 | dev_set_name(dev, "rfkill%lu", rfkill_no); |
1022 | rfkill_no++; | |
1023 | ||
19d337df JB |
1024 | list_add_tail(&rfkill->node, &rfkill_list); |
1025 | ||
1026 | error = device_add(dev); | |
1027 | if (error) | |
1028 | goto remove; | |
1029 | ||
1030 | error = rfkill_led_trigger_register(rfkill); | |
1031 | if (error) | |
1032 | goto devdel; | |
1033 | ||
1034 | rfkill->registered = true; | |
1035 | ||
2ec2c68c | 1036 | INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); |
19d337df | 1037 | INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); |
19d337df | 1038 | INIT_WORK(&rfkill->sync_work, rfkill_sync_work); |
2ec2c68c JB |
1039 | |
1040 | if (rfkill->ops->poll) | |
67235cbc SD |
1041 | queue_delayed_work(system_power_efficient_wq, |
1042 | &rfkill->poll_work, | |
2ec2c68c | 1043 | round_jiffies_relative(POLL_INTERVAL)); |
b3fa1329 AJ |
1044 | |
1045 | if (!rfkill->persistent || rfkill_epo_lock_active) { | |
1046 | schedule_work(&rfkill->sync_work); | |
1047 | } else { | |
1048 | #ifdef CONFIG_RFKILL_INPUT | |
1049 | bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); | |
1050 | ||
1051 | if (!atomic_read(&rfkill_input_disabled)) | |
1052 | __rfkill_switch_all(rfkill->type, soft_blocked); | |
1053 | #endif | |
1054 | } | |
2ec2c68c | 1055 | |
d874cd74 | 1056 | rfkill_global_led_trigger_event(); |
c64fb016 | 1057 | rfkill_send_events(rfkill, RFKILL_OP_ADD); |
19d337df JB |
1058 | |
1059 | mutex_unlock(&rfkill_global_mutex); | |
1060 | return 0; | |
1061 | ||
1062 | devdel: | |
1063 | device_del(&rfkill->dev); | |
1064 | remove: | |
1065 | list_del_init(&rfkill->node); | |
1066 | unlock: | |
1067 | mutex_unlock(&rfkill_global_mutex); | |
1068 | return error; | |
1069 | } | |
1070 | EXPORT_SYMBOL(rfkill_register); | |
1071 | ||
1072 | void rfkill_unregister(struct rfkill *rfkill) | |
1073 | { | |
1074 | BUG_ON(!rfkill); | |
1075 | ||
1076 | if (rfkill->ops->poll) | |
1077 | cancel_delayed_work_sync(&rfkill->poll_work); | |
1078 | ||
1079 | cancel_work_sync(&rfkill->uevent_work); | |
1080 | cancel_work_sync(&rfkill->sync_work); | |
1081 | ||
1082 | rfkill->registered = false; | |
1083 | ||
1084 | device_del(&rfkill->dev); | |
1085 | ||
1086 | mutex_lock(&rfkill_global_mutex); | |
c64fb016 | 1087 | rfkill_send_events(rfkill, RFKILL_OP_DEL); |
19d337df | 1088 | list_del_init(&rfkill->node); |
d874cd74 | 1089 | rfkill_global_led_trigger_event(); |
19d337df JB |
1090 | mutex_unlock(&rfkill_global_mutex); |
1091 | ||
1092 | rfkill_led_trigger_unregister(rfkill); | |
1093 | } | |
1094 | EXPORT_SYMBOL(rfkill_unregister); | |
1095 | ||
1096 | void rfkill_destroy(struct rfkill *rfkill) | |
1097 | { | |
1098 | if (rfkill) | |
1099 | put_device(&rfkill->dev); | |
1100 | } | |
1101 | EXPORT_SYMBOL(rfkill_destroy); | |
1102 | ||
c64fb016 JB |
1103 | static int rfkill_fop_open(struct inode *inode, struct file *file) |
1104 | { | |
1105 | struct rfkill_data *data; | |
1106 | struct rfkill *rfkill; | |
1107 | struct rfkill_int_event *ev, *tmp; | |
1108 | ||
1109 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1110 | if (!data) | |
1111 | return -ENOMEM; | |
1112 | ||
1113 | INIT_LIST_HEAD(&data->events); | |
1114 | mutex_init(&data->mtx); | |
1115 | init_waitqueue_head(&data->read_wait); | |
1116 | ||
1117 | mutex_lock(&rfkill_global_mutex); | |
1118 | mutex_lock(&data->mtx); | |
1119 | /* | |
1120 | * start getting events from elsewhere but hold mtx to get | |
1121 | * startup events added first | |
1122 | */ | |
c64fb016 JB |
1123 | |
1124 | list_for_each_entry(rfkill, &rfkill_list, node) { | |
1125 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); | |
1126 | if (!ev) | |
1127 | goto free; | |
1128 | rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); | |
1129 | list_add_tail(&ev->list, &data->events); | |
1130 | } | |
bd2281b8 | 1131 | list_add(&data->list, &rfkill_fds); |
c64fb016 JB |
1132 | mutex_unlock(&data->mtx); |
1133 | mutex_unlock(&rfkill_global_mutex); | |
1134 | ||
1135 | file->private_data = data; | |
1136 | ||
c5bf68fe | 1137 | return stream_open(inode, file); |
c64fb016 JB |
1138 | |
1139 | free: | |
1140 | mutex_unlock(&data->mtx); | |
1141 | mutex_unlock(&rfkill_global_mutex); | |
1142 | mutex_destroy(&data->mtx); | |
1143 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1144 | kfree(ev); | |
1145 | kfree(data); | |
1146 | return -ENOMEM; | |
1147 | } | |
1148 | ||
ade994f4 | 1149 | static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait) |
c64fb016 JB |
1150 | { |
1151 | struct rfkill_data *data = file->private_data; | |
a9a08845 | 1152 | __poll_t res = EPOLLOUT | EPOLLWRNORM; |
c64fb016 JB |
1153 | |
1154 | poll_wait(file, &data->read_wait, wait); | |
1155 | ||
1156 | mutex_lock(&data->mtx); | |
1157 | if (!list_empty(&data->events)) | |
a9a08845 | 1158 | res = EPOLLIN | EPOLLRDNORM; |
c64fb016 JB |
1159 | mutex_unlock(&data->mtx); |
1160 | ||
1161 | return res; | |
1162 | } | |
1163 | ||
c64fb016 JB |
1164 | static ssize_t rfkill_fop_read(struct file *file, char __user *buf, |
1165 | size_t count, loff_t *pos) | |
1166 | { | |
1167 | struct rfkill_data *data = file->private_data; | |
1168 | struct rfkill_int_event *ev; | |
1169 | unsigned long sz; | |
1170 | int ret; | |
1171 | ||
1172 | mutex_lock(&data->mtx); | |
1173 | ||
1174 | while (list_empty(&data->events)) { | |
1175 | if (file->f_flags & O_NONBLOCK) { | |
1176 | ret = -EAGAIN; | |
1177 | goto out; | |
1178 | } | |
1179 | mutex_unlock(&data->mtx); | |
6736fde9 JB |
1180 | /* since we re-check and it just compares pointers, |
1181 | * using !list_empty() without locking isn't a problem | |
1182 | */ | |
c64fb016 | 1183 | ret = wait_event_interruptible(data->read_wait, |
6736fde9 | 1184 | !list_empty(&data->events)); |
c64fb016 JB |
1185 | mutex_lock(&data->mtx); |
1186 | ||
1187 | if (ret) | |
1188 | goto out; | |
1189 | } | |
1190 | ||
1191 | ev = list_first_entry(&data->events, struct rfkill_int_event, | |
1192 | list); | |
1193 | ||
1194 | sz = min_t(unsigned long, sizeof(ev->ev), count); | |
1195 | ret = sz; | |
1196 | if (copy_to_user(buf, &ev->ev, sz)) | |
1197 | ret = -EFAULT; | |
1198 | ||
1199 | list_del(&ev->list); | |
1200 | kfree(ev); | |
1201 | out: | |
1202 | mutex_unlock(&data->mtx); | |
1203 | return ret; | |
1204 | } | |
1205 | ||
1206 | static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, | |
1207 | size_t count, loff_t *pos) | |
1208 | { | |
1209 | struct rfkill *rfkill; | |
1210 | struct rfkill_event ev; | |
1948b2a2 | 1211 | int ret; |
c64fb016 JB |
1212 | |
1213 | /* we don't need the 'hard' variable but accept it */ | |
1be491fc | 1214 | if (count < RFKILL_EVENT_SIZE_V1 - 1) |
c64fb016 JB |
1215 | return -EINVAL; |
1216 | ||
1be491fc JB |
1217 | /* |
1218 | * Copy as much data as we can accept into our 'ev' buffer, | |
1219 | * but tell userspace how much we've copied so it can determine | |
1220 | * our API version even in a write() call, if it cares. | |
1221 | */ | |
1222 | count = min(count, sizeof(ev)); | |
1223 | if (copy_from_user(&ev, buf, count)) | |
c64fb016 JB |
1224 | return -EFAULT; |
1225 | ||
c64fb016 JB |
1226 | if (ev.type >= NUM_RFKILL_TYPES) |
1227 | return -EINVAL; | |
1228 | ||
1229 | mutex_lock(&rfkill_global_mutex); | |
1230 | ||
1948b2a2 JPRV |
1231 | switch (ev.op) { |
1232 | case RFKILL_OP_CHANGE_ALL: | |
9487bd6b | 1233 | rfkill_update_global_state(ev.type, ev.soft); |
1948b2a2 JPRV |
1234 | list_for_each_entry(rfkill, &rfkill_list, node) |
1235 | if (rfkill->type == ev.type || | |
1236 | ev.type == RFKILL_TYPE_ALL) | |
1237 | rfkill_set_block(rfkill, ev.soft); | |
1238 | ret = 0; | |
1239 | break; | |
1240 | case RFKILL_OP_CHANGE: | |
1241 | list_for_each_entry(rfkill, &rfkill_list, node) | |
1242 | if (rfkill->idx == ev.idx && | |
1243 | (rfkill->type == ev.type || | |
1244 | ev.type == RFKILL_TYPE_ALL)) | |
1245 | rfkill_set_block(rfkill, ev.soft); | |
1246 | ret = 0; | |
1247 | break; | |
1248 | default: | |
1249 | ret = -EINVAL; | |
1250 | break; | |
c64fb016 | 1251 | } |
1948b2a2 | 1252 | |
c64fb016 JB |
1253 | mutex_unlock(&rfkill_global_mutex); |
1254 | ||
1948b2a2 | 1255 | return ret ?: count; |
c64fb016 JB |
1256 | } |
1257 | ||
1258 | static int rfkill_fop_release(struct inode *inode, struct file *file) | |
1259 | { | |
1260 | struct rfkill_data *data = file->private_data; | |
1261 | struct rfkill_int_event *ev, *tmp; | |
1262 | ||
1263 | mutex_lock(&rfkill_global_mutex); | |
1264 | list_del(&data->list); | |
1265 | mutex_unlock(&rfkill_global_mutex); | |
1266 | ||
1267 | mutex_destroy(&data->mtx); | |
1268 | list_for_each_entry_safe(ev, tmp, &data->events, list) | |
1269 | kfree(ev); | |
1270 | ||
1271 | #ifdef CONFIG_RFKILL_INPUT | |
1272 | if (data->input_handler) | |
207ee162 JB |
1273 | if (atomic_dec_return(&rfkill_input_disabled) == 0) |
1274 | printk(KERN_DEBUG "rfkill: input handler enabled\n"); | |
c64fb016 JB |
1275 | #endif |
1276 | ||
1277 | kfree(data); | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | #ifdef CONFIG_RFKILL_INPUT | |
1283 | static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, | |
1284 | unsigned long arg) | |
1285 | { | |
1286 | struct rfkill_data *data = file->private_data; | |
1287 | ||
1288 | if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) | |
1289 | return -ENOSYS; | |
1290 | ||
1291 | if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) | |
1292 | return -ENOSYS; | |
1293 | ||
1294 | mutex_lock(&data->mtx); | |
1295 | ||
1296 | if (!data->input_handler) { | |
207ee162 JB |
1297 | if (atomic_inc_return(&rfkill_input_disabled) == 1) |
1298 | printk(KERN_DEBUG "rfkill: input handler disabled\n"); | |
c64fb016 JB |
1299 | data->input_handler = true; |
1300 | } | |
1301 | ||
1302 | mutex_unlock(&data->mtx); | |
1303 | ||
1304 | return 0; | |
1305 | } | |
1306 | #endif | |
1307 | ||
1308 | static const struct file_operations rfkill_fops = { | |
45ba564d | 1309 | .owner = THIS_MODULE, |
c64fb016 JB |
1310 | .open = rfkill_fop_open, |
1311 | .read = rfkill_fop_read, | |
1312 | .write = rfkill_fop_write, | |
1313 | .poll = rfkill_fop_poll, | |
1314 | .release = rfkill_fop_release, | |
1315 | #ifdef CONFIG_RFKILL_INPUT | |
1316 | .unlocked_ioctl = rfkill_fop_ioctl, | |
1832f2d8 | 1317 | .compat_ioctl = compat_ptr_ioctl, |
c64fb016 | 1318 | #endif |
6038f373 | 1319 | .llseek = no_llseek, |
c64fb016 JB |
1320 | }; |
1321 | ||
8670b2b8 MH |
1322 | #define RFKILL_NAME "rfkill" |
1323 | ||
c64fb016 | 1324 | static struct miscdevice rfkill_miscdev = { |
c64fb016 | 1325 | .fops = &rfkill_fops, |
8670b2b8 MH |
1326 | .name = RFKILL_NAME, |
1327 | .minor = RFKILL_MINOR, | |
c64fb016 | 1328 | }; |
19d337df JB |
1329 | |
1330 | static int __init rfkill_init(void) | |
1331 | { | |
1332 | int error; | |
19d337df | 1333 | |
9487bd6b | 1334 | rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state); |
19d337df JB |
1335 | |
1336 | error = class_register(&rfkill_class); | |
1337 | if (error) | |
6124c53e | 1338 | goto error_class; |
19d337df | 1339 | |
c64fb016 | 1340 | error = misc_register(&rfkill_miscdev); |
6124c53e MK |
1341 | if (error) |
1342 | goto error_misc; | |
c64fb016 | 1343 | |
d874cd74 | 1344 | error = rfkill_global_led_trigger_register(); |
9b8e34e2 MK |
1345 | if (error) |
1346 | goto error_led_trigger; | |
1347 | ||
19d337df JB |
1348 | #ifdef CONFIG_RFKILL_INPUT |
1349 | error = rfkill_handler_init(); | |
6124c53e MK |
1350 | if (error) |
1351 | goto error_input; | |
19d337df JB |
1352 | #endif |
1353 | ||
6124c53e MK |
1354 | return 0; |
1355 | ||
f6b4122c | 1356 | #ifdef CONFIG_RFKILL_INPUT |
6124c53e | 1357 | error_input: |
d874cd74 | 1358 | rfkill_global_led_trigger_unregister(); |
7b854982 | 1359 | #endif |
9b8e34e2 MK |
1360 | error_led_trigger: |
1361 | misc_deregister(&rfkill_miscdev); | |
6124c53e MK |
1362 | error_misc: |
1363 | class_unregister(&rfkill_class); | |
1364 | error_class: | |
19d337df JB |
1365 | return error; |
1366 | } | |
1367 | subsys_initcall(rfkill_init); | |
1368 | ||
1369 | static void __exit rfkill_exit(void) | |
1370 | { | |
1371 | #ifdef CONFIG_RFKILL_INPUT | |
1372 | rfkill_handler_exit(); | |
1373 | #endif | |
d874cd74 | 1374 | rfkill_global_led_trigger_unregister(); |
c64fb016 | 1375 | misc_deregister(&rfkill_miscdev); |
19d337df JB |
1376 | class_unregister(&rfkill_class); |
1377 | } | |
1378 | module_exit(rfkill_exit); | |
8670b2b8 MH |
1379 | |
1380 | MODULE_ALIAS_MISCDEV(RFKILL_MINOR); | |
1381 | MODULE_ALIAS("devname:" RFKILL_NAME); |