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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> |
30 | #include <linux/sched.h> |
31 | #include <linux/spinlock.h> |
32 | #include <linux/miscdevice.h> |
33 | #include <linux/wait.h> |
34 | #include <linux/poll.h> |
35 | #include <linux/fs.h> |
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 | |
52 | const char *name; |
53 | enum rfkill_type type; |
54 | |
55 | unsigned long state; |
56 | |
57 | u32 idx; |
58 | |
59 | bool registered; |
60 | bool persistent; |
61 | |
62 | const struct rfkill_ops *ops; |
63 | void *data; |
64 | |
65 | #ifdef CONFIG_RFKILL_LEDS |
66 | struct led_trigger led_trigger; |
67 | const char *ledtrigname; |
68 | #endif |
69 | |
70 | struct device dev; |
71 | struct list_head node; |
72 | |
73 | struct delayed_work poll_work; |
74 | struct work_struct uevent_work; |
75 | struct work_struct sync_work; |
76 | }; |
77 | #define to_rfkill(d) container_of(d, struct rfkill, dev) |
78 | |
79 | struct rfkill_int_event { |
80 | struct list_head list; |
81 | struct rfkill_event ev; |
82 | }; |
83 | |
84 | struct rfkill_data { |
85 | struct list_head list; |
86 | struct list_head events; |
87 | struct mutex mtx; |
88 | wait_queue_head_t read_wait; |
89 | bool input_handler; |
90 | }; |
91 | |
92 | |
93 | MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>"); |
94 | MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); |
95 | MODULE_DESCRIPTION("RF switch support"); |
96 | MODULE_LICENSE("GPL"); |
97 | |
98 | |
99 | /* |
100 | * The locking here should be made much smarter, we currently have |
101 | * a bit of a stupid situation because drivers might want to register |
102 | * the rfkill struct under their own lock, and take this lock during |
103 | * rfkill method calls -- which will cause an AB-BA deadlock situation. |
104 | * |
105 | * To fix that, we need to rework this code here to be mostly lock-free |
106 | * and only use the mutex for list manipulations, not to protect the |
107 | * various other global variables. Then we can avoid holding the mutex |
108 | * around driver operations, and all is happy. |
109 | */ |
110 | static LIST_HEAD(rfkill_list); /* list of registered rf switches */ |
111 | static DEFINE_MUTEX(rfkill_global_mutex); |
112 | static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */ |
113 | |
114 | static unsigned int rfkill_default_state = 1; |
115 | module_param_named(default_state, rfkill_default_state, uint, 0444); |
116 | MODULE_PARM_DESC(default_state, |
117 | "Default initial state for all radio types, 0 = radio off"); |
118 | |
119 | static struct { |
120 | bool cur, sav; |
121 | } rfkill_global_states[NUM_RFKILL_TYPES]; |
122 | |
123 | static bool rfkill_epo_lock_active; |
124 | |
125 | |
126 | #ifdef CONFIG_RFKILL_LEDS |
127 | static void rfkill_led_trigger_event(struct rfkill *rfkill) |
128 | { |
129 | struct led_trigger *trigger; |
130 | |
131 | if (!rfkill->registered) |
132 | return; |
133 | |
134 | trigger = &rfkill->led_trigger; |
135 | |
136 | if (rfkill->state & RFKILL_BLOCK_ANY) |
137 | led_trigger_event(trigger, LED_OFF); |
138 | else |
139 | led_trigger_event(trigger, LED_FULL); |
140 | } |
141 | |
142 | static void rfkill_led_trigger_activate(struct led_classdev *led) |
143 | { |
144 | struct rfkill *rfkill; |
145 | |
146 | rfkill = container_of(led->trigger, struct rfkill, led_trigger); |
147 | |
148 | rfkill_led_trigger_event(rfkill); |
149 | } |
150 | |
151 | const char *rfkill_get_led_trigger_name(struct rfkill *rfkill) |
152 | { |
153 | return rfkill->led_trigger.name; |
154 | } |
155 | EXPORT_SYMBOL(rfkill_get_led_trigger_name); |
156 | |
157 | void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name) |
158 | { |
159 | BUG_ON(!rfkill); |
160 | |
161 | rfkill->ledtrigname = name; |
162 | } |
163 | EXPORT_SYMBOL(rfkill_set_led_trigger_name); |
164 | |
165 | static int rfkill_led_trigger_register(struct rfkill *rfkill) |
166 | { |
167 | rfkill->led_trigger.name = rfkill->ledtrigname |
168 | ? : dev_name(&rfkill->dev); |
169 | rfkill->led_trigger.activate = rfkill_led_trigger_activate; |
170 | return led_trigger_register(&rfkill->led_trigger); |
171 | } |
172 | |
173 | static void rfkill_led_trigger_unregister(struct rfkill *rfkill) |
174 | { |
175 | led_trigger_unregister(&rfkill->led_trigger); |
176 | } |
177 | #else |
178 | static void rfkill_led_trigger_event(struct rfkill *rfkill) |
179 | { |
180 | } |
181 | |
182 | static inline int rfkill_led_trigger_register(struct rfkill *rfkill) |
183 | { |
184 | return 0; |
185 | } |
186 | |
187 | static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill) |
188 | { |
189 | } |
190 | #endif /* CONFIG_RFKILL_LEDS */ |
191 | |
192 | static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill, |
193 | enum rfkill_operation op) |
194 | { |
195 | unsigned long flags; |
196 | |
197 | ev->idx = rfkill->idx; |
198 | ev->type = rfkill->type; |
199 | ev->op = op; |
200 | |
201 | spin_lock_irqsave(&rfkill->lock, flags); |
202 | ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW); |
203 | ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW | |
204 | RFKILL_BLOCK_SW_PREV)); |
205 | spin_unlock_irqrestore(&rfkill->lock, flags); |
206 | } |
207 | |
208 | static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op) |
209 | { |
210 | struct rfkill_data *data; |
211 | struct rfkill_int_event *ev; |
212 | |
213 | list_for_each_entry(data, &rfkill_fds, list) { |
214 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); |
215 | if (!ev) |
216 | continue; |
217 | rfkill_fill_event(&ev->ev, rfkill, op); |
218 | mutex_lock(&data->mtx); |
219 | list_add_tail(&ev->list, &data->events); |
220 | mutex_unlock(&data->mtx); |
221 | wake_up_interruptible(&data->read_wait); |
222 | } |
223 | } |
224 | |
225 | static void rfkill_event(struct rfkill *rfkill) |
226 | { |
227 | if (!rfkill->registered) |
228 | return; |
229 | |
230 | kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE); |
231 | |
232 | /* also send event to /dev/rfkill */ |
233 | rfkill_send_events(rfkill, RFKILL_OP_CHANGE); |
234 | } |
235 | |
236 | static bool __rfkill_set_hw_state(struct rfkill *rfkill, |
237 | bool blocked, bool *change) |
238 | { |
239 | unsigned long flags; |
240 | bool prev, any; |
241 | |
242 | BUG_ON(!rfkill); |
243 | |
244 | spin_lock_irqsave(&rfkill->lock, flags); |
245 | prev = !!(rfkill->state & RFKILL_BLOCK_HW); |
246 | if (blocked) |
247 | rfkill->state |= RFKILL_BLOCK_HW; |
248 | else |
249 | rfkill->state &= ~RFKILL_BLOCK_HW; |
250 | *change = prev != blocked; |
251 | any = rfkill->state & RFKILL_BLOCK_ANY; |
252 | spin_unlock_irqrestore(&rfkill->lock, flags); |
253 | |
254 | rfkill_led_trigger_event(rfkill); |
255 | |
256 | return any; |
257 | } |
258 | |
259 | /** |
260 | * rfkill_set_block - wrapper for set_block method |
261 | * |
262 | * @rfkill: the rfkill struct to use |
263 | * @blocked: the new software state |
264 | * |
265 | * Calls the set_block method (when applicable) and handles notifications |
266 | * etc. as well. |
267 | */ |
268 | static void rfkill_set_block(struct rfkill *rfkill, bool blocked) |
269 | { |
270 | unsigned long flags; |
271 | int err; |
272 | |
273 | if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP)) |
274 | return; |
275 | |
276 | /* |
277 | * Some platforms (...!) generate input events which affect the |
278 | * _hard_ kill state -- whenever something tries to change the |
279 | * current software state query the hardware state too. |
280 | */ |
281 | if (rfkill->ops->query) |
282 | rfkill->ops->query(rfkill, rfkill->data); |
283 | |
284 | spin_lock_irqsave(&rfkill->lock, flags); |
285 | if (rfkill->state & RFKILL_BLOCK_SW) |
286 | rfkill->state |= RFKILL_BLOCK_SW_PREV; |
287 | else |
288 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; |
289 | |
290 | if (blocked) |
291 | rfkill->state |= RFKILL_BLOCK_SW; |
292 | else |
293 | rfkill->state &= ~RFKILL_BLOCK_SW; |
294 | |
295 | rfkill->state |= RFKILL_BLOCK_SW_SETCALL; |
296 | spin_unlock_irqrestore(&rfkill->lock, flags); |
297 | |
298 | err = rfkill->ops->set_block(rfkill->data, blocked); |
299 | |
300 | spin_lock_irqsave(&rfkill->lock, flags); |
301 | if (err) { |
302 | /* |
303 | * Failed -- reset status to _prev, this may be different |
304 | * from what set set _PREV to earlier in this function |
305 | * if rfkill_set_sw_state was invoked. |
306 | */ |
307 | if (rfkill->state & RFKILL_BLOCK_SW_PREV) |
308 | rfkill->state |= RFKILL_BLOCK_SW; |
309 | else |
310 | rfkill->state &= ~RFKILL_BLOCK_SW; |
311 | } |
312 | rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL; |
313 | rfkill->state &= ~RFKILL_BLOCK_SW_PREV; |
314 | spin_unlock_irqrestore(&rfkill->lock, flags); |
315 | |
316 | rfkill_led_trigger_event(rfkill); |
317 | rfkill_event(rfkill); |
318 | } |
319 | |
320 | #ifdef CONFIG_RFKILL_INPUT |
321 | static atomic_t rfkill_input_disabled = ATOMIC_INIT(0); |
322 | |
323 | /** |
324 | * __rfkill_switch_all - Toggle state of all switches of given type |
325 | * @type: type of interfaces to be affected |
326 | * @state: the new state |
327 | * |
328 | * This function sets the state of all switches of given type, |
329 | * unless a specific switch is claimed by userspace (in which case, |
330 | * that switch is left alone) or suspended. |
331 | * |
332 | * Caller must have acquired rfkill_global_mutex. |
333 | */ |
334 | static void __rfkill_switch_all(const enum rfkill_type type, bool blocked) |
335 | { |
336 | struct rfkill *rfkill; |
337 | |
338 | rfkill_global_states[type].cur = blocked; |
339 | list_for_each_entry(rfkill, &rfkill_list, node) { |
340 | if (rfkill->type != type) |
341 | continue; |
342 | |
343 | rfkill_set_block(rfkill, blocked); |
344 | } |
345 | } |
346 | |
347 | /** |
348 | * rfkill_switch_all - Toggle state of all switches of given type |
349 | * @type: type of interfaces to be affected |
350 | * @state: the new state |
351 | * |
352 | * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state). |
353 | * Please refer to __rfkill_switch_all() for details. |
354 | * |
355 | * Does nothing if the EPO lock is active. |
356 | */ |
357 | void rfkill_switch_all(enum rfkill_type type, bool blocked) |
358 | { |
359 | if (atomic_read(&rfkill_input_disabled)) |
360 | return; |
361 | |
362 | mutex_lock(&rfkill_global_mutex); |
363 | |
364 | if (!rfkill_epo_lock_active) |
365 | __rfkill_switch_all(type, blocked); |
366 | |
367 | mutex_unlock(&rfkill_global_mutex); |
368 | } |
369 | |
370 | /** |
371 | * rfkill_epo - emergency power off all transmitters |
372 | * |
373 | * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED, |
374 | * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex. |
375 | * |
376 | * The global state before the EPO is saved and can be restored later |
377 | * using rfkill_restore_states(). |
378 | */ |
379 | void rfkill_epo(void) |
380 | { |
381 | struct rfkill *rfkill; |
382 | int i; |
383 | |
384 | if (atomic_read(&rfkill_input_disabled)) |
385 | return; |
386 | |
387 | mutex_lock(&rfkill_global_mutex); |
388 | |
389 | rfkill_epo_lock_active = true; |
390 | list_for_each_entry(rfkill, &rfkill_list, node) |
391 | rfkill_set_block(rfkill, true); |
392 | |
393 | for (i = 0; i < NUM_RFKILL_TYPES; i++) { |
394 | rfkill_global_states[i].sav = rfkill_global_states[i].cur; |
395 | rfkill_global_states[i].cur = true; |
396 | } |
397 | |
398 | mutex_unlock(&rfkill_global_mutex); |
399 | } |
400 | |
401 | /** |
402 | * rfkill_restore_states - restore global states |
403 | * |
404 | * Restore (and sync switches to) the global state from the |
405 | * states in rfkill_default_states. This can undo the effects of |
406 | * a call to rfkill_epo(). |
407 | */ |
408 | void rfkill_restore_states(void) |
409 | { |
410 | int i; |
411 | |
412 | if (atomic_read(&rfkill_input_disabled)) |
413 | return; |
414 | |
415 | mutex_lock(&rfkill_global_mutex); |
416 | |
417 | rfkill_epo_lock_active = false; |
418 | for (i = 0; i < NUM_RFKILL_TYPES; i++) |
419 | __rfkill_switch_all(i, rfkill_global_states[i].sav); |
420 | mutex_unlock(&rfkill_global_mutex); |
421 | } |
422 | |
423 | /** |
424 | * rfkill_remove_epo_lock - unlock state changes |
425 | * |
426 | * Used by rfkill-input manually unlock state changes, when |
427 | * the EPO switch is deactivated. |
428 | */ |
429 | void rfkill_remove_epo_lock(void) |
430 | { |
431 | if (atomic_read(&rfkill_input_disabled)) |
432 | return; |
433 | |
434 | mutex_lock(&rfkill_global_mutex); |
435 | rfkill_epo_lock_active = false; |
436 | mutex_unlock(&rfkill_global_mutex); |
437 | } |
438 | |
439 | /** |
440 | * rfkill_is_epo_lock_active - returns true EPO is active |
441 | * |
442 | * Returns 0 (false) if there is NOT an active EPO contidion, |
443 | * and 1 (true) if there is an active EPO contition, which |
444 | * locks all radios in one of the BLOCKED states. |
445 | * |
446 | * Can be called in atomic context. |
447 | */ |
448 | bool rfkill_is_epo_lock_active(void) |
449 | { |
450 | return rfkill_epo_lock_active; |
451 | } |
452 | |
453 | /** |
454 | * rfkill_get_global_sw_state - returns global state for a type |
455 | * @type: the type to get the global state of |
456 | * |
457 | * Returns the current global state for a given wireless |
458 | * device type. |
459 | */ |
460 | bool rfkill_get_global_sw_state(const enum rfkill_type type) |
461 | { |
462 | return rfkill_global_states[type].cur; |
463 | } |
464 | #endif |
465 | |
466 | |
467 | bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked) |
468 | { |
469 | bool ret, change; |
470 | |
471 | ret = __rfkill_set_hw_state(rfkill, blocked, &change); |
472 | |
473 | if (!rfkill->registered) |
474 | return ret; |
475 | |
476 | if (change) |
477 | schedule_work(&rfkill->uevent_work); |
478 | |
479 | return ret; |
480 | } |
481 | EXPORT_SYMBOL(rfkill_set_hw_state); |
482 | |
483 | static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) |
484 | { |
485 | u32 bit = RFKILL_BLOCK_SW; |
486 | |
487 | /* if in a ops->set_block right now, use other bit */ |
488 | if (rfkill->state & RFKILL_BLOCK_SW_SETCALL) |
489 | bit = RFKILL_BLOCK_SW_PREV; |
490 | |
491 | if (blocked) |
492 | rfkill->state |= bit; |
493 | else |
494 | rfkill->state &= ~bit; |
495 | } |
496 | |
497 | bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked) |
498 | { |
499 | unsigned long flags; |
500 | bool prev, hwblock; |
501 | |
502 | BUG_ON(!rfkill); |
503 | |
504 | spin_lock_irqsave(&rfkill->lock, flags); |
505 | prev = !!(rfkill->state & RFKILL_BLOCK_SW); |
506 | __rfkill_set_sw_state(rfkill, blocked); |
507 | hwblock = !!(rfkill->state & RFKILL_BLOCK_HW); |
508 | blocked = blocked || hwblock; |
509 | spin_unlock_irqrestore(&rfkill->lock, flags); |
510 | |
511 | if (!rfkill->registered) |
512 | return blocked; |
513 | |
514 | if (prev != blocked && !hwblock) |
515 | schedule_work(&rfkill->uevent_work); |
516 | |
517 | rfkill_led_trigger_event(rfkill); |
518 | |
519 | return blocked; |
520 | } |
521 | EXPORT_SYMBOL(rfkill_set_sw_state); |
522 | |
523 | void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked) |
524 | { |
525 | unsigned long flags; |
526 | |
527 | BUG_ON(!rfkill); |
528 | BUG_ON(rfkill->registered); |
529 | |
530 | spin_lock_irqsave(&rfkill->lock, flags); |
531 | __rfkill_set_sw_state(rfkill, blocked); |
532 | rfkill->persistent = true; |
533 | spin_unlock_irqrestore(&rfkill->lock, flags); |
534 | } |
535 | EXPORT_SYMBOL(rfkill_init_sw_state); |
536 | |
537 | void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw) |
538 | { |
539 | unsigned long flags; |
540 | bool swprev, hwprev; |
541 | |
542 | BUG_ON(!rfkill); |
543 | |
544 | spin_lock_irqsave(&rfkill->lock, flags); |
545 | |
546 | /* |
547 | * No need to care about prev/setblock ... this is for uevent only |
548 | * and that will get triggered by rfkill_set_block anyway. |
549 | */ |
550 | swprev = !!(rfkill->state & RFKILL_BLOCK_SW); |
551 | hwprev = !!(rfkill->state & RFKILL_BLOCK_HW); |
552 | __rfkill_set_sw_state(rfkill, sw); |
553 | if (hw) |
554 | rfkill->state |= RFKILL_BLOCK_HW; |
555 | else |
556 | rfkill->state &= ~RFKILL_BLOCK_HW; |
557 | |
558 | spin_unlock_irqrestore(&rfkill->lock, flags); |
559 | |
560 | if (!rfkill->registered) { |
561 | rfkill->persistent = true; |
562 | } else { |
563 | if (swprev != sw || hwprev != hw) |
564 | schedule_work(&rfkill->uevent_work); |
565 | |
566 | rfkill_led_trigger_event(rfkill); |
567 | } |
568 | } |
569 | EXPORT_SYMBOL(rfkill_set_states); |
570 | |
571 | static ssize_t rfkill_name_show(struct device *dev, |
572 | struct device_attribute *attr, |
573 | char *buf) |
574 | { |
575 | struct rfkill *rfkill = to_rfkill(dev); |
576 | |
577 | return sprintf(buf, "%s\n", rfkill->name); |
578 | } |
579 | |
580 | static const char *rfkill_get_type_str(enum rfkill_type type) |
581 | { |
582 | switch (type) { |
583 | case RFKILL_TYPE_WLAN: |
584 | return "wlan"; |
585 | case RFKILL_TYPE_BLUETOOTH: |
586 | return "bluetooth"; |
587 | case RFKILL_TYPE_UWB: |
588 | return "ultrawideband"; |
589 | case RFKILL_TYPE_WIMAX: |
590 | return "wimax"; |
591 | case RFKILL_TYPE_WWAN: |
592 | return "wwan"; |
593 | case RFKILL_TYPE_GPS: |
594 | return "gps"; |
595 | default: |
596 | BUG(); |
597 | } |
598 | |
599 | BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_GPS + 1); |
600 | } |
601 | |
602 | static ssize_t rfkill_type_show(struct device *dev, |
603 | struct device_attribute *attr, |
604 | char *buf) |
605 | { |
606 | struct rfkill *rfkill = to_rfkill(dev); |
607 | |
608 | return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type)); |
609 | } |
610 | |
611 | static ssize_t rfkill_idx_show(struct device *dev, |
612 | struct device_attribute *attr, |
613 | char *buf) |
614 | { |
615 | struct rfkill *rfkill = to_rfkill(dev); |
616 | |
617 | return sprintf(buf, "%d\n", rfkill->idx); |
618 | } |
619 | |
620 | static ssize_t rfkill_persistent_show(struct device *dev, |
621 | struct device_attribute *attr, |
622 | char *buf) |
623 | { |
624 | struct rfkill *rfkill = to_rfkill(dev); |
625 | |
626 | return sprintf(buf, "%d\n", rfkill->persistent); |
627 | } |
628 | |
629 | static u8 user_state_from_blocked(unsigned long state) |
630 | { |
631 | if (state & RFKILL_BLOCK_HW) |
632 | return RFKILL_USER_STATE_HARD_BLOCKED; |
633 | if (state & RFKILL_BLOCK_SW) |
634 | return RFKILL_USER_STATE_SOFT_BLOCKED; |
635 | |
636 | return RFKILL_USER_STATE_UNBLOCKED; |
637 | } |
638 | |
639 | static ssize_t rfkill_state_show(struct device *dev, |
640 | struct device_attribute *attr, |
641 | char *buf) |
642 | { |
643 | struct rfkill *rfkill = to_rfkill(dev); |
644 | unsigned long flags; |
645 | u32 state; |
646 | |
647 | spin_lock_irqsave(&rfkill->lock, flags); |
648 | state = rfkill->state; |
649 | spin_unlock_irqrestore(&rfkill->lock, flags); |
650 | |
651 | return sprintf(buf, "%d\n", user_state_from_blocked(state)); |
652 | } |
653 | |
654 | static ssize_t rfkill_state_store(struct device *dev, |
655 | struct device_attribute *attr, |
656 | const char *buf, size_t count) |
657 | { |
658 | struct rfkill *rfkill = to_rfkill(dev); |
659 | unsigned long state; |
660 | int err; |
661 | |
662 | if (!capable(CAP_NET_ADMIN)) |
663 | return -EPERM; |
664 | |
665 | err = strict_strtoul(buf, 0, &state); |
666 | if (err) |
667 | return err; |
668 | |
669 | if (state != RFKILL_USER_STATE_SOFT_BLOCKED && |
670 | state != RFKILL_USER_STATE_UNBLOCKED) |
671 | return -EINVAL; |
672 | |
673 | mutex_lock(&rfkill_global_mutex); |
674 | rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED); |
675 | mutex_unlock(&rfkill_global_mutex); |
676 | |
677 | return err ?: count; |
678 | } |
679 | |
680 | static ssize_t rfkill_claim_show(struct device *dev, |
681 | struct device_attribute *attr, |
682 | char *buf) |
683 | { |
684 | return sprintf(buf, "%d\n", 0); |
685 | } |
686 | |
687 | static ssize_t rfkill_claim_store(struct device *dev, |
688 | struct device_attribute *attr, |
689 | const char *buf, size_t count) |
690 | { |
691 | return -EOPNOTSUPP; |
692 | } |
693 | |
694 | static struct device_attribute rfkill_dev_attrs[] = { |
695 | __ATTR(name, S_IRUGO, rfkill_name_show, NULL), |
696 | __ATTR(type, S_IRUGO, rfkill_type_show, NULL), |
697 | __ATTR(index, S_IRUGO, rfkill_idx_show, NULL), |
698 | __ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL), |
699 | __ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store), |
700 | __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store), |
701 | __ATTR_NULL |
702 | }; |
703 | |
704 | static void rfkill_release(struct device *dev) |
705 | { |
706 | struct rfkill *rfkill = to_rfkill(dev); |
707 | |
708 | kfree(rfkill); |
709 | } |
710 | |
711 | static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env) |
712 | { |
713 | struct rfkill *rfkill = to_rfkill(dev); |
714 | unsigned long flags; |
715 | u32 state; |
716 | int error; |
717 | |
718 | error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name); |
719 | if (error) |
720 | return error; |
721 | error = add_uevent_var(env, "RFKILL_TYPE=%s", |
722 | rfkill_get_type_str(rfkill->type)); |
723 | if (error) |
724 | return error; |
725 | spin_lock_irqsave(&rfkill->lock, flags); |
726 | state = rfkill->state; |
727 | spin_unlock_irqrestore(&rfkill->lock, flags); |
728 | error = add_uevent_var(env, "RFKILL_STATE=%d", |
729 | user_state_from_blocked(state)); |
730 | return error; |
731 | } |
732 | |
733 | void rfkill_pause_polling(struct rfkill *rfkill) |
734 | { |
735 | BUG_ON(!rfkill); |
736 | |
737 | if (!rfkill->ops->poll) |
738 | return; |
739 | |
740 | cancel_delayed_work_sync(&rfkill->poll_work); |
741 | } |
742 | EXPORT_SYMBOL(rfkill_pause_polling); |
743 | |
744 | void rfkill_resume_polling(struct rfkill *rfkill) |
745 | { |
746 | BUG_ON(!rfkill); |
747 | |
748 | if (!rfkill->ops->poll) |
749 | return; |
750 | |
751 | schedule_work(&rfkill->poll_work.work); |
752 | } |
753 | EXPORT_SYMBOL(rfkill_resume_polling); |
754 | |
755 | static int rfkill_suspend(struct device *dev, pm_message_t state) |
756 | { |
757 | struct rfkill *rfkill = to_rfkill(dev); |
758 | |
759 | rfkill_pause_polling(rfkill); |
760 | |
761 | return 0; |
762 | } |
763 | |
764 | static int rfkill_resume(struct device *dev) |
765 | { |
766 | struct rfkill *rfkill = to_rfkill(dev); |
767 | bool cur; |
768 | |
769 | if (!rfkill->persistent) { |
770 | cur = !!(rfkill->state & RFKILL_BLOCK_SW); |
771 | rfkill_set_block(rfkill, cur); |
772 | } |
773 | |
774 | rfkill_resume_polling(rfkill); |
775 | |
776 | return 0; |
777 | } |
778 | |
779 | static struct class rfkill_class = { |
780 | .name = "rfkill", |
781 | .dev_release = rfkill_release, |
782 | .dev_attrs = rfkill_dev_attrs, |
783 | .dev_uevent = rfkill_dev_uevent, |
784 | .suspend = rfkill_suspend, |
785 | .resume = rfkill_resume, |
786 | }; |
787 | |
788 | bool rfkill_blocked(struct rfkill *rfkill) |
789 | { |
790 | unsigned long flags; |
791 | u32 state; |
792 | |
793 | spin_lock_irqsave(&rfkill->lock, flags); |
794 | state = rfkill->state; |
795 | spin_unlock_irqrestore(&rfkill->lock, flags); |
796 | |
797 | return !!(state & RFKILL_BLOCK_ANY); |
798 | } |
799 | EXPORT_SYMBOL(rfkill_blocked); |
800 | |
801 | |
802 | struct rfkill * __must_check rfkill_alloc(const char *name, |
803 | struct device *parent, |
804 | const enum rfkill_type type, |
805 | const struct rfkill_ops *ops, |
806 | void *ops_data) |
807 | { |
808 | struct rfkill *rfkill; |
809 | struct device *dev; |
810 | |
811 | if (WARN_ON(!ops)) |
812 | return NULL; |
813 | |
814 | if (WARN_ON(!ops->set_block)) |
815 | return NULL; |
816 | |
817 | if (WARN_ON(!name)) |
818 | return NULL; |
819 | |
820 | if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) |
821 | return NULL; |
822 | |
823 | rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL); |
824 | if (!rfkill) |
825 | return NULL; |
826 | |
827 | spin_lock_init(&rfkill->lock); |
828 | INIT_LIST_HEAD(&rfkill->node); |
829 | rfkill->type = type; |
830 | rfkill->name = name; |
831 | rfkill->ops = ops; |
832 | rfkill->data = ops_data; |
833 | |
834 | dev = &rfkill->dev; |
835 | dev->class = &rfkill_class; |
836 | dev->parent = parent; |
837 | device_initialize(dev); |
838 | |
839 | return rfkill; |
840 | } |
841 | EXPORT_SYMBOL(rfkill_alloc); |
842 | |
843 | static void rfkill_poll(struct work_struct *work) |
844 | { |
845 | struct rfkill *rfkill; |
846 | |
847 | rfkill = container_of(work, struct rfkill, poll_work.work); |
848 | |
849 | /* |
850 | * Poll hardware state -- driver will use one of the |
851 | * rfkill_set{,_hw,_sw}_state functions and use its |
852 | * return value to update the current status. |
853 | */ |
854 | rfkill->ops->poll(rfkill, rfkill->data); |
855 | |
856 | schedule_delayed_work(&rfkill->poll_work, |
857 | round_jiffies_relative(POLL_INTERVAL)); |
858 | } |
859 | |
860 | static void rfkill_uevent_work(struct work_struct *work) |
861 | { |
862 | struct rfkill *rfkill; |
863 | |
864 | rfkill = container_of(work, struct rfkill, uevent_work); |
865 | |
866 | mutex_lock(&rfkill_global_mutex); |
867 | rfkill_event(rfkill); |
868 | mutex_unlock(&rfkill_global_mutex); |
869 | } |
870 | |
871 | static void rfkill_sync_work(struct work_struct *work) |
872 | { |
873 | struct rfkill *rfkill; |
874 | bool cur; |
875 | |
876 | rfkill = container_of(work, struct rfkill, sync_work); |
877 | |
878 | mutex_lock(&rfkill_global_mutex); |
879 | cur = rfkill_global_states[rfkill->type].cur; |
880 | rfkill_set_block(rfkill, cur); |
881 | mutex_unlock(&rfkill_global_mutex); |
882 | } |
883 | |
884 | int __must_check rfkill_register(struct rfkill *rfkill) |
885 | { |
886 | static unsigned long rfkill_no; |
887 | struct device *dev = &rfkill->dev; |
888 | int error; |
889 | |
890 | BUG_ON(!rfkill); |
891 | |
892 | mutex_lock(&rfkill_global_mutex); |
893 | |
894 | if (rfkill->registered) { |
895 | error = -EALREADY; |
896 | goto unlock; |
897 | } |
898 | |
899 | rfkill->idx = rfkill_no; |
900 | dev_set_name(dev, "rfkill%lu", rfkill_no); |
901 | rfkill_no++; |
902 | |
903 | list_add_tail(&rfkill->node, &rfkill_list); |
904 | |
905 | error = device_add(dev); |
906 | if (error) |
907 | goto remove; |
908 | |
909 | error = rfkill_led_trigger_register(rfkill); |
910 | if (error) |
911 | goto devdel; |
912 | |
913 | rfkill->registered = true; |
914 | |
915 | INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll); |
916 | INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work); |
917 | INIT_WORK(&rfkill->sync_work, rfkill_sync_work); |
918 | |
919 | if (rfkill->ops->poll) |
920 | schedule_delayed_work(&rfkill->poll_work, |
921 | round_jiffies_relative(POLL_INTERVAL)); |
922 | |
923 | if (!rfkill->persistent || rfkill_epo_lock_active) { |
924 | schedule_work(&rfkill->sync_work); |
925 | } else { |
926 | #ifdef CONFIG_RFKILL_INPUT |
927 | bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW); |
928 | |
929 | if (!atomic_read(&rfkill_input_disabled)) |
930 | __rfkill_switch_all(rfkill->type, soft_blocked); |
931 | #endif |
932 | } |
933 | |
934 | rfkill_send_events(rfkill, RFKILL_OP_ADD); |
935 | |
936 | mutex_unlock(&rfkill_global_mutex); |
937 | return 0; |
938 | |
939 | devdel: |
940 | device_del(&rfkill->dev); |
941 | remove: |
942 | list_del_init(&rfkill->node); |
943 | unlock: |
944 | mutex_unlock(&rfkill_global_mutex); |
945 | return error; |
946 | } |
947 | EXPORT_SYMBOL(rfkill_register); |
948 | |
949 | void rfkill_unregister(struct rfkill *rfkill) |
950 | { |
951 | BUG_ON(!rfkill); |
952 | |
953 | if (rfkill->ops->poll) |
954 | cancel_delayed_work_sync(&rfkill->poll_work); |
955 | |
956 | cancel_work_sync(&rfkill->uevent_work); |
957 | cancel_work_sync(&rfkill->sync_work); |
958 | |
959 | rfkill->registered = false; |
960 | |
961 | device_del(&rfkill->dev); |
962 | |
963 | mutex_lock(&rfkill_global_mutex); |
964 | rfkill_send_events(rfkill, RFKILL_OP_DEL); |
965 | list_del_init(&rfkill->node); |
966 | mutex_unlock(&rfkill_global_mutex); |
967 | |
968 | rfkill_led_trigger_unregister(rfkill); |
969 | } |
970 | EXPORT_SYMBOL(rfkill_unregister); |
971 | |
972 | void rfkill_destroy(struct rfkill *rfkill) |
973 | { |
974 | if (rfkill) |
975 | put_device(&rfkill->dev); |
976 | } |
977 | EXPORT_SYMBOL(rfkill_destroy); |
978 | |
979 | static int rfkill_fop_open(struct inode *inode, struct file *file) |
980 | { |
981 | struct rfkill_data *data; |
982 | struct rfkill *rfkill; |
983 | struct rfkill_int_event *ev, *tmp; |
984 | |
985 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
986 | if (!data) |
987 | return -ENOMEM; |
988 | |
989 | INIT_LIST_HEAD(&data->events); |
990 | mutex_init(&data->mtx); |
991 | init_waitqueue_head(&data->read_wait); |
992 | |
993 | mutex_lock(&rfkill_global_mutex); |
994 | mutex_lock(&data->mtx); |
995 | /* |
996 | * start getting events from elsewhere but hold mtx to get |
997 | * startup events added first |
998 | */ |
999 | list_add(&data->list, &rfkill_fds); |
1000 | |
1001 | list_for_each_entry(rfkill, &rfkill_list, node) { |
1002 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); |
1003 | if (!ev) |
1004 | goto free; |
1005 | rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD); |
1006 | list_add_tail(&ev->list, &data->events); |
1007 | } |
1008 | mutex_unlock(&data->mtx); |
1009 | mutex_unlock(&rfkill_global_mutex); |
1010 | |
1011 | file->private_data = data; |
1012 | |
1013 | return nonseekable_open(inode, file); |
1014 | |
1015 | free: |
1016 | mutex_unlock(&data->mtx); |
1017 | mutex_unlock(&rfkill_global_mutex); |
1018 | mutex_destroy(&data->mtx); |
1019 | list_for_each_entry_safe(ev, tmp, &data->events, list) |
1020 | kfree(ev); |
1021 | kfree(data); |
1022 | return -ENOMEM; |
1023 | } |
1024 | |
1025 | static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait) |
1026 | { |
1027 | struct rfkill_data *data = file->private_data; |
1028 | unsigned int res = POLLOUT | POLLWRNORM; |
1029 | |
1030 | poll_wait(file, &data->read_wait, wait); |
1031 | |
1032 | mutex_lock(&data->mtx); |
1033 | if (!list_empty(&data->events)) |
1034 | res = POLLIN | POLLRDNORM; |
1035 | mutex_unlock(&data->mtx); |
1036 | |
1037 | return res; |
1038 | } |
1039 | |
1040 | static bool rfkill_readable(struct rfkill_data *data) |
1041 | { |
1042 | bool r; |
1043 | |
1044 | mutex_lock(&data->mtx); |
1045 | r = !list_empty(&data->events); |
1046 | mutex_unlock(&data->mtx); |
1047 | |
1048 | return r; |
1049 | } |
1050 | |
1051 | static ssize_t rfkill_fop_read(struct file *file, char __user *buf, |
1052 | size_t count, loff_t *pos) |
1053 | { |
1054 | struct rfkill_data *data = file->private_data; |
1055 | struct rfkill_int_event *ev; |
1056 | unsigned long sz; |
1057 | int ret; |
1058 | |
1059 | mutex_lock(&data->mtx); |
1060 | |
1061 | while (list_empty(&data->events)) { |
1062 | if (file->f_flags & O_NONBLOCK) { |
1063 | ret = -EAGAIN; |
1064 | goto out; |
1065 | } |
1066 | mutex_unlock(&data->mtx); |
1067 | ret = wait_event_interruptible(data->read_wait, |
1068 | rfkill_readable(data)); |
1069 | mutex_lock(&data->mtx); |
1070 | |
1071 | if (ret) |
1072 | goto out; |
1073 | } |
1074 | |
1075 | ev = list_first_entry(&data->events, struct rfkill_int_event, |
1076 | list); |
1077 | |
1078 | sz = min_t(unsigned long, sizeof(ev->ev), count); |
1079 | ret = sz; |
1080 | if (copy_to_user(buf, &ev->ev, sz)) |
1081 | ret = -EFAULT; |
1082 | |
1083 | list_del(&ev->list); |
1084 | kfree(ev); |
1085 | out: |
1086 | mutex_unlock(&data->mtx); |
1087 | return ret; |
1088 | } |
1089 | |
1090 | static ssize_t rfkill_fop_write(struct file *file, const char __user *buf, |
1091 | size_t count, loff_t *pos) |
1092 | { |
1093 | struct rfkill *rfkill; |
1094 | struct rfkill_event ev; |
1095 | |
1096 | /* we don't need the 'hard' variable but accept it */ |
1097 | if (count < RFKILL_EVENT_SIZE_V1 - 1) |
1098 | return -EINVAL; |
1099 | |
1100 | /* |
1101 | * Copy as much data as we can accept into our 'ev' buffer, |
1102 | * but tell userspace how much we've copied so it can determine |
1103 | * our API version even in a write() call, if it cares. |
1104 | */ |
1105 | count = min(count, sizeof(ev)); |
1106 | if (copy_from_user(&ev, buf, count)) |
1107 | return -EFAULT; |
1108 | |
1109 | if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL) |
1110 | return -EINVAL; |
1111 | |
1112 | if (ev.type >= NUM_RFKILL_TYPES) |
1113 | return -EINVAL; |
1114 | |
1115 | mutex_lock(&rfkill_global_mutex); |
1116 | |
1117 | if (ev.op == RFKILL_OP_CHANGE_ALL) { |
1118 | if (ev.type == RFKILL_TYPE_ALL) { |
1119 | enum rfkill_type i; |
1120 | for (i = 0; i < NUM_RFKILL_TYPES; i++) |
1121 | rfkill_global_states[i].cur = ev.soft; |
1122 | } else { |
1123 | rfkill_global_states[ev.type].cur = ev.soft; |
1124 | } |
1125 | } |
1126 | |
1127 | list_for_each_entry(rfkill, &rfkill_list, node) { |
1128 | if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL) |
1129 | continue; |
1130 | |
1131 | if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL) |
1132 | continue; |
1133 | |
1134 | rfkill_set_block(rfkill, ev.soft); |
1135 | } |
1136 | mutex_unlock(&rfkill_global_mutex); |
1137 | |
1138 | return count; |
1139 | } |
1140 | |
1141 | static int rfkill_fop_release(struct inode *inode, struct file *file) |
1142 | { |
1143 | struct rfkill_data *data = file->private_data; |
1144 | struct rfkill_int_event *ev, *tmp; |
1145 | |
1146 | mutex_lock(&rfkill_global_mutex); |
1147 | list_del(&data->list); |
1148 | mutex_unlock(&rfkill_global_mutex); |
1149 | |
1150 | mutex_destroy(&data->mtx); |
1151 | list_for_each_entry_safe(ev, tmp, &data->events, list) |
1152 | kfree(ev); |
1153 | |
1154 | #ifdef CONFIG_RFKILL_INPUT |
1155 | if (data->input_handler) |
1156 | if (atomic_dec_return(&rfkill_input_disabled) == 0) |
1157 | printk(KERN_DEBUG "rfkill: input handler enabled\n"); |
1158 | #endif |
1159 | |
1160 | kfree(data); |
1161 | |
1162 | return 0; |
1163 | } |
1164 | |
1165 | #ifdef CONFIG_RFKILL_INPUT |
1166 | static long rfkill_fop_ioctl(struct file *file, unsigned int cmd, |
1167 | unsigned long arg) |
1168 | { |
1169 | struct rfkill_data *data = file->private_data; |
1170 | |
1171 | if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC) |
1172 | return -ENOSYS; |
1173 | |
1174 | if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT) |
1175 | return -ENOSYS; |
1176 | |
1177 | mutex_lock(&data->mtx); |
1178 | |
1179 | if (!data->input_handler) { |
1180 | if (atomic_inc_return(&rfkill_input_disabled) == 1) |
1181 | printk(KERN_DEBUG "rfkill: input handler disabled\n"); |
1182 | data->input_handler = true; |
1183 | } |
1184 | |
1185 | mutex_unlock(&data->mtx); |
1186 | |
1187 | return 0; |
1188 | } |
1189 | #endif |
1190 | |
1191 | static const struct file_operations rfkill_fops = { |
1192 | .owner = THIS_MODULE, |
1193 | .open = rfkill_fop_open, |
1194 | .read = rfkill_fop_read, |
1195 | .write = rfkill_fop_write, |
1196 | .poll = rfkill_fop_poll, |
1197 | .release = rfkill_fop_release, |
1198 | #ifdef CONFIG_RFKILL_INPUT |
1199 | .unlocked_ioctl = rfkill_fop_ioctl, |
1200 | .compat_ioctl = rfkill_fop_ioctl, |
1201 | #endif |
1202 | }; |
1203 | |
1204 | static struct miscdevice rfkill_miscdev = { |
1205 | .name = "rfkill", |
1206 | .fops = &rfkill_fops, |
1207 | .minor = MISC_DYNAMIC_MINOR, |
1208 | }; |
1209 | |
1210 | static int __init rfkill_init(void) |
1211 | { |
1212 | int error; |
1213 | int i; |
1214 | |
1215 | for (i = 0; i < NUM_RFKILL_TYPES; i++) |
1216 | rfkill_global_states[i].cur = !rfkill_default_state; |
1217 | |
1218 | error = class_register(&rfkill_class); |
1219 | if (error) |
1220 | goto out; |
1221 | |
1222 | error = misc_register(&rfkill_miscdev); |
1223 | if (error) { |
1224 | class_unregister(&rfkill_class); |
1225 | goto out; |
1226 | } |
1227 | |
1228 | #ifdef CONFIG_RFKILL_INPUT |
1229 | error = rfkill_handler_init(); |
1230 | if (error) { |
1231 | misc_deregister(&rfkill_miscdev); |
1232 | class_unregister(&rfkill_class); |
1233 | goto out; |
1234 | } |
1235 | #endif |
1236 | |
1237 | out: |
1238 | return error; |
1239 | } |
1240 | subsys_initcall(rfkill_init); |
1241 | |
1242 | static void __exit rfkill_exit(void) |
1243 | { |
1244 | #ifdef CONFIG_RFKILL_INPUT |
1245 | rfkill_handler_exit(); |
1246 | #endif |
1247 | misc_deregister(&rfkill_miscdev); |
1248 | class_unregister(&rfkill_class); |
1249 | } |
1250 | module_exit(rfkill_exit); |
1251 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9