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Johannes Berg19d337d2009-06-02 13:01:37 +02001/*
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
Jeff Kirsher8232f1f2013-12-06 03:32:14 -080017 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Johannes Berg19d337d2009-06-02 13:01:37 +020018 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/workqueue.h>
24#include <linux/capability.h>
25#include <linux/list.h>
26#include <linux/mutex.h>
27#include <linux/rfkill.h>
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040028#include <linux/sched.h>
Johannes Berg19d337d2009-06-02 13:01:37 +020029#include <linux/spinlock.h>
Paul Gortmaker51990e82012-01-22 11:23:42 -050030#include <linux/device.h>
Johannes Bergc64fb012009-06-02 13:01:38 +020031#include <linux/miscdevice.h>
32#include <linux/wait.h>
33#include <linux/poll.h>
34#include <linux/fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/slab.h>
Johannes Berg19d337d2009-06-02 13:01:37 +020036
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
49struct rfkill {
50 spinlock_t lock;
51
52 const char *name;
53 enum rfkill_type type;
54
55 unsigned long state;
56
Johannes Bergc64fb012009-06-02 13:01:38 +020057 u32 idx;
58
Johannes Berg19d337d2009-06-02 13:01:37 +020059 bool registered;
Alan Jenkinsb3fa1322009-06-08 13:27:27 +010060 bool persistent;
Johannes Berg19d337d2009-06-02 13:01:37 +020061
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
Johannes Bergc64fb012009-06-02 13:01:38 +020079struct rfkill_int_event {
80 struct list_head list;
81 struct rfkill_event ev;
82};
83
84struct 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};
Johannes Berg19d337d2009-06-02 13:01:37 +020091
92
93MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
94MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
95MODULE_DESCRIPTION("RF switch support");
96MODULE_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 */
110static LIST_HEAD(rfkill_list); /* list of registered rf switches */
111static DEFINE_MUTEX(rfkill_global_mutex);
Johannes Bergc64fb012009-06-02 13:01:38 +0200112static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
Johannes Berg19d337d2009-06-02 13:01:37 +0200113
114static unsigned int rfkill_default_state = 1;
115module_param_named(default_state, rfkill_default_state, uint, 0444);
116MODULE_PARM_DESC(default_state,
117 "Default initial state for all radio types, 0 = radio off");
118
119static struct {
Alan Jenkinsb3fa1322009-06-08 13:27:27 +0100120 bool cur, sav;
Johannes Berg19d337d2009-06-02 13:01:37 +0200121} rfkill_global_states[NUM_RFKILL_TYPES];
122
Johannes Berg19d337d2009-06-02 13:01:37 +0200123static bool rfkill_epo_lock_active;
124
125
126#ifdef CONFIG_RFKILL_LEDS
127static 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
142static 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
AceLan Kao06d7de82012-07-26 09:51:08 +0800151const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
152{
153 return rfkill->led_trigger.name;
154}
155EXPORT_SYMBOL(rfkill_get_led_trigger_name);
156
157void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
158{
159 BUG_ON(!rfkill);
160
161 rfkill->ledtrigname = name;
162}
163EXPORT_SYMBOL(rfkill_set_led_trigger_name);
164
Johannes Berg19d337d2009-06-02 13:01:37 +0200165static 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
173static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
174{
175 led_trigger_unregister(&rfkill->led_trigger);
176}
177#else
178static void rfkill_led_trigger_event(struct rfkill *rfkill)
179{
180}
181
182static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
183{
184 return 0;
185}
186
187static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
188{
189}
190#endif /* CONFIG_RFKILL_LEDS */
191
Johannes Bergc64fb012009-06-02 13:01:38 +0200192static 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
208static 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
225static void rfkill_event(struct rfkill *rfkill)
Johannes Berg19d337d2009-06-02 13:01:37 +0200226{
Alan Jenkins06d5caf2009-06-16 15:39:51 +0100227 if (!rfkill->registered)
Johannes Berg19d337d2009-06-02 13:01:37 +0200228 return;
229
230 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
Johannes Bergc64fb012009-06-02 13:01:38 +0200231
232 /* also send event to /dev/rfkill */
233 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
Johannes Berg19d337d2009-06-02 13:01:37 +0200234}
235
236static 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;
Mohammed Shafi Shajakhan6be19cc2011-09-16 19:03:40 +0530251 any = !!(rfkill->state & RFKILL_BLOCK_ANY);
Johannes Berg19d337d2009-06-02 13:01:37 +0200252 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 */
268static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
269{
270 unsigned long flags;
Vitaly Wooleab48342012-09-06 16:06:52 +0200271 bool prev, curr;
Johannes Berg19d337d2009-06-02 13:01:37 +0200272 int err;
273
Alan Jenkins7fa20a72009-06-16 14:53:24 +0100274 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
275 return;
276
Johannes Berg19d337d2009-06-02 13:01:37 +0200277 /*
278 * Some platforms (...!) generate input events which affect the
279 * _hard_ kill state -- whenever something tries to change the
280 * current software state query the hardware state too.
281 */
282 if (rfkill->ops->query)
283 rfkill->ops->query(rfkill, rfkill->data);
284
285 spin_lock_irqsave(&rfkill->lock, flags);
Vitaly Wooleab48342012-09-06 16:06:52 +0200286 prev = rfkill->state & RFKILL_BLOCK_SW;
287
Johannes Berg19d337d2009-06-02 13:01:37 +0200288 if (rfkill->state & RFKILL_BLOCK_SW)
289 rfkill->state |= RFKILL_BLOCK_SW_PREV;
290 else
291 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
292
293 if (blocked)
294 rfkill->state |= RFKILL_BLOCK_SW;
295 else
296 rfkill->state &= ~RFKILL_BLOCK_SW;
297
298 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
299 spin_unlock_irqrestore(&rfkill->lock, flags);
300
Johannes Berg19d337d2009-06-02 13:01:37 +0200301 err = rfkill->ops->set_block(rfkill->data, blocked);
302
303 spin_lock_irqsave(&rfkill->lock, flags);
304 if (err) {
305 /*
306 * Failed -- reset status to _prev, this may be different
307 * from what set set _PREV to earlier in this function
308 * if rfkill_set_sw_state was invoked.
309 */
310 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
311 rfkill->state |= RFKILL_BLOCK_SW;
312 else
313 rfkill->state &= ~RFKILL_BLOCK_SW;
314 }
315 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
316 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
Vitaly Wooleab48342012-09-06 16:06:52 +0200317 curr = rfkill->state & RFKILL_BLOCK_SW;
Johannes Berg19d337d2009-06-02 13:01:37 +0200318 spin_unlock_irqrestore(&rfkill->lock, flags);
319
320 rfkill_led_trigger_event(rfkill);
Vitaly Wooleab48342012-09-06 16:06:52 +0200321
322 if (prev != curr)
323 rfkill_event(rfkill);
Johannes Berg19d337d2009-06-02 13:01:37 +0200324}
325
Johannes Bergc64fb012009-06-02 13:01:38 +0200326#ifdef CONFIG_RFKILL_INPUT
327static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
328
Johannes Berg19d337d2009-06-02 13:01:37 +0200329/**
330 * __rfkill_switch_all - Toggle state of all switches of given type
331 * @type: type of interfaces to be affected
Fabian Frederick2f29fed2014-10-07 22:20:23 +0200332 * @blocked: the new state
Johannes Berg19d337d2009-06-02 13:01:37 +0200333 *
334 * This function sets the state of all switches of given type,
335 * unless a specific switch is claimed by userspace (in which case,
336 * that switch is left alone) or suspended.
337 *
338 * Caller must have acquired rfkill_global_mutex.
339 */
340static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
341{
342 struct rfkill *rfkill;
343
344 rfkill_global_states[type].cur = blocked;
345 list_for_each_entry(rfkill, &rfkill_list, node) {
Alex Hung27e49ca2012-05-23 14:11:52 +0800346 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
Johannes Berg19d337d2009-06-02 13:01:37 +0200347 continue;
348
349 rfkill_set_block(rfkill, blocked);
350 }
351}
352
353/**
354 * rfkill_switch_all - Toggle state of all switches of given type
355 * @type: type of interfaces to be affected
Fabian Frederick2f29fed2014-10-07 22:20:23 +0200356 * @blocked: the new state
Johannes Berg19d337d2009-06-02 13:01:37 +0200357 *
358 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
359 * Please refer to __rfkill_switch_all() for details.
360 *
361 * Does nothing if the EPO lock is active.
362 */
363void rfkill_switch_all(enum rfkill_type type, bool blocked)
364{
Johannes Bergc64fb012009-06-02 13:01:38 +0200365 if (atomic_read(&rfkill_input_disabled))
366 return;
367
Johannes Berg19d337d2009-06-02 13:01:37 +0200368 mutex_lock(&rfkill_global_mutex);
369
370 if (!rfkill_epo_lock_active)
371 __rfkill_switch_all(type, blocked);
372
373 mutex_unlock(&rfkill_global_mutex);
374}
375
376/**
377 * rfkill_epo - emergency power off all transmitters
378 *
379 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
380 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
381 *
382 * The global state before the EPO is saved and can be restored later
383 * using rfkill_restore_states().
384 */
385void rfkill_epo(void)
386{
387 struct rfkill *rfkill;
388 int i;
389
Johannes Bergc64fb012009-06-02 13:01:38 +0200390 if (atomic_read(&rfkill_input_disabled))
391 return;
392
Johannes Berg19d337d2009-06-02 13:01:37 +0200393 mutex_lock(&rfkill_global_mutex);
394
395 rfkill_epo_lock_active = true;
396 list_for_each_entry(rfkill, &rfkill_list, node)
397 rfkill_set_block(rfkill, true);
398
399 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
Alan Jenkinsb3fa1322009-06-08 13:27:27 +0100400 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
Johannes Berg19d337d2009-06-02 13:01:37 +0200401 rfkill_global_states[i].cur = true;
402 }
Johannes Bergc64fb012009-06-02 13:01:38 +0200403
Johannes Berg19d337d2009-06-02 13:01:37 +0200404 mutex_unlock(&rfkill_global_mutex);
405}
406
407/**
408 * rfkill_restore_states - restore global states
409 *
410 * Restore (and sync switches to) the global state from the
411 * states in rfkill_default_states. This can undo the effects of
412 * a call to rfkill_epo().
413 */
414void rfkill_restore_states(void)
415{
416 int i;
417
Johannes Bergc64fb012009-06-02 13:01:38 +0200418 if (atomic_read(&rfkill_input_disabled))
419 return;
420
Johannes Berg19d337d2009-06-02 13:01:37 +0200421 mutex_lock(&rfkill_global_mutex);
422
423 rfkill_epo_lock_active = false;
424 for (i = 0; i < NUM_RFKILL_TYPES; i++)
Alan Jenkinsb3fa1322009-06-08 13:27:27 +0100425 __rfkill_switch_all(i, rfkill_global_states[i].sav);
Johannes Berg19d337d2009-06-02 13:01:37 +0200426 mutex_unlock(&rfkill_global_mutex);
427}
428
429/**
430 * rfkill_remove_epo_lock - unlock state changes
431 *
432 * Used by rfkill-input manually unlock state changes, when
433 * the EPO switch is deactivated.
434 */
435void rfkill_remove_epo_lock(void)
436{
Johannes Bergc64fb012009-06-02 13:01:38 +0200437 if (atomic_read(&rfkill_input_disabled))
438 return;
439
Johannes Berg19d337d2009-06-02 13:01:37 +0200440 mutex_lock(&rfkill_global_mutex);
441 rfkill_epo_lock_active = false;
442 mutex_unlock(&rfkill_global_mutex);
443}
444
445/**
446 * rfkill_is_epo_lock_active - returns true EPO is active
447 *
448 * Returns 0 (false) if there is NOT an active EPO contidion,
449 * and 1 (true) if there is an active EPO contition, which
450 * locks all radios in one of the BLOCKED states.
451 *
452 * Can be called in atomic context.
453 */
454bool rfkill_is_epo_lock_active(void)
455{
456 return rfkill_epo_lock_active;
457}
458
459/**
460 * rfkill_get_global_sw_state - returns global state for a type
461 * @type: the type to get the global state of
462 *
463 * Returns the current global state for a given wireless
464 * device type.
465 */
466bool rfkill_get_global_sw_state(const enum rfkill_type type)
467{
468 return rfkill_global_states[type].cur;
469}
Johannes Bergc64fb012009-06-02 13:01:38 +0200470#endif
Johannes Berg19d337d2009-06-02 13:01:37 +0200471
Johannes Berg19d337d2009-06-02 13:01:37 +0200472
473bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
474{
475 bool ret, change;
476
477 ret = __rfkill_set_hw_state(rfkill, blocked, &change);
478
479 if (!rfkill->registered)
480 return ret;
481
482 if (change)
483 schedule_work(&rfkill->uevent_work);
484
485 return ret;
486}
487EXPORT_SYMBOL(rfkill_set_hw_state);
488
489static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
490{
491 u32 bit = RFKILL_BLOCK_SW;
492
493 /* if in a ops->set_block right now, use other bit */
494 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
495 bit = RFKILL_BLOCK_SW_PREV;
496
497 if (blocked)
498 rfkill->state |= bit;
499 else
500 rfkill->state &= ~bit;
501}
502
503bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
504{
505 unsigned long flags;
506 bool prev, hwblock;
507
508 BUG_ON(!rfkill);
509
510 spin_lock_irqsave(&rfkill->lock, flags);
511 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
512 __rfkill_set_sw_state(rfkill, blocked);
513 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
514 blocked = blocked || hwblock;
515 spin_unlock_irqrestore(&rfkill->lock, flags);
516
Alan Jenkins06d5caf2009-06-16 15:39:51 +0100517 if (!rfkill->registered)
518 return blocked;
Johannes Berg19d337d2009-06-02 13:01:37 +0200519
Alan Jenkins06d5caf2009-06-16 15:39:51 +0100520 if (prev != blocked && !hwblock)
521 schedule_work(&rfkill->uevent_work);
522
523 rfkill_led_trigger_event(rfkill);
Johannes Berg19d337d2009-06-02 13:01:37 +0200524
525 return blocked;
526}
527EXPORT_SYMBOL(rfkill_set_sw_state);
528
Alan Jenkins06d5caf2009-06-16 15:39:51 +0100529void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
530{
531 unsigned long flags;
532
533 BUG_ON(!rfkill);
534 BUG_ON(rfkill->registered);
535
536 spin_lock_irqsave(&rfkill->lock, flags);
537 __rfkill_set_sw_state(rfkill, blocked);
538 rfkill->persistent = true;
539 spin_unlock_irqrestore(&rfkill->lock, flags);
540}
541EXPORT_SYMBOL(rfkill_init_sw_state);
542
Johannes Berg19d337d2009-06-02 13:01:37 +0200543void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
544{
545 unsigned long flags;
546 bool swprev, hwprev;
547
548 BUG_ON(!rfkill);
549
550 spin_lock_irqsave(&rfkill->lock, flags);
551
552 /*
553 * No need to care about prev/setblock ... this is for uevent only
554 * and that will get triggered by rfkill_set_block anyway.
555 */
556 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
557 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
558 __rfkill_set_sw_state(rfkill, sw);
Alan Jenkins48ab3572009-07-12 17:03:13 +0100559 if (hw)
560 rfkill->state |= RFKILL_BLOCK_HW;
561 else
562 rfkill->state &= ~RFKILL_BLOCK_HW;
Johannes Berg19d337d2009-06-02 13:01:37 +0200563
564 spin_unlock_irqrestore(&rfkill->lock, flags);
565
Alan Jenkinsb3fa1322009-06-08 13:27:27 +0100566 if (!rfkill->registered) {
567 rfkill->persistent = true;
568 } else {
569 if (swprev != sw || hwprev != hw)
570 schedule_work(&rfkill->uevent_work);
Johannes Berg19d337d2009-06-02 13:01:37 +0200571
Alan Jenkinsb3fa1322009-06-08 13:27:27 +0100572 rfkill_led_trigger_event(rfkill);
573 }
Johannes Berg19d337d2009-06-02 13:01:37 +0200574}
575EXPORT_SYMBOL(rfkill_set_states);
576
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700577static ssize_t name_show(struct device *dev, struct device_attribute *attr,
578 char *buf)
Johannes Berg19d337d2009-06-02 13:01:37 +0200579{
580 struct rfkill *rfkill = to_rfkill(dev);
581
582 return sprintf(buf, "%s\n", rfkill->name);
583}
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700584static DEVICE_ATTR_RO(name);
Johannes Berg19d337d2009-06-02 13:01:37 +0200585
586static const char *rfkill_get_type_str(enum rfkill_type type)
587{
Samuel Ortiz44b3dec2013-04-11 11:51:36 +0200588 BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_NFC + 1);
Andrew Morton02f7f172009-12-03 20:45:07 -0800589
Johannes Berg19d337d2009-06-02 13:01:37 +0200590 switch (type) {
591 case RFKILL_TYPE_WLAN:
592 return "wlan";
593 case RFKILL_TYPE_BLUETOOTH:
594 return "bluetooth";
595 case RFKILL_TYPE_UWB:
596 return "ultrawideband";
597 case RFKILL_TYPE_WIMAX:
598 return "wimax";
599 case RFKILL_TYPE_WWAN:
600 return "wwan";
Tomas Winkler3ad20142009-08-02 02:36:49 +0300601 case RFKILL_TYPE_GPS:
602 return "gps";
Marcel Holtmann875405a2009-11-18 16:48:01 +0100603 case RFKILL_TYPE_FM:
604 return "fm";
Samuel Ortiz44b3dec2013-04-11 11:51:36 +0200605 case RFKILL_TYPE_NFC:
606 return "nfc";
Johannes Berg19d337d2009-06-02 13:01:37 +0200607 default:
608 BUG();
609 }
Johannes Berg19d337d2009-06-02 13:01:37 +0200610}
611
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700612static ssize_t type_show(struct device *dev, struct device_attribute *attr,
613 char *buf)
Johannes Berg19d337d2009-06-02 13:01:37 +0200614{
615 struct rfkill *rfkill = to_rfkill(dev);
616
617 return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
618}
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700619static DEVICE_ATTR_RO(type);
Johannes Berg19d337d2009-06-02 13:01:37 +0200620
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700621static ssize_t index_show(struct device *dev, struct device_attribute *attr,
622 char *buf)
Johannes Bergc64fb012009-06-02 13:01:38 +0200623{
624 struct rfkill *rfkill = to_rfkill(dev);
625
626 return sprintf(buf, "%d\n", rfkill->idx);
627}
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700628static DEVICE_ATTR_RO(index);
Johannes Bergc64fb012009-06-02 13:01:38 +0200629
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700630static ssize_t persistent_show(struct device *dev,
631 struct device_attribute *attr, char *buf)
Alan Jenkins464902e2009-06-16 14:54:04 +0100632{
633 struct rfkill *rfkill = to_rfkill(dev);
634
635 return sprintf(buf, "%d\n", rfkill->persistent);
636}
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700637static DEVICE_ATTR_RO(persistent);
Alan Jenkins464902e2009-06-16 14:54:04 +0100638
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700639static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
640 char *buf)
florian@mickler.org6c263612010-02-26 12:01:34 +0100641{
642 struct rfkill *rfkill = to_rfkill(dev);
florian@mickler.org6c263612010-02-26 12:01:34 +0100643
florian@mickler.org819bfec2010-03-13 13:31:05 +0100644 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
florian@mickler.org6c263612010-02-26 12:01:34 +0100645}
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700646static DEVICE_ATTR_RO(hard);
florian@mickler.org6c263612010-02-26 12:01:34 +0100647
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700648static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
649 char *buf)
florian@mickler.org6c263612010-02-26 12:01:34 +0100650{
651 struct rfkill *rfkill = to_rfkill(dev);
florian@mickler.org6c263612010-02-26 12:01:34 +0100652
florian@mickler.org819bfec2010-03-13 13:31:05 +0100653 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
florian@mickler.org6c263612010-02-26 12:01:34 +0100654}
655
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700656static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
657 const char *buf, size_t count)
florian@mickler.org6c263612010-02-26 12:01:34 +0100658{
659 struct rfkill *rfkill = to_rfkill(dev);
660 unsigned long state;
661 int err;
662
663 if (!capable(CAP_NET_ADMIN))
664 return -EPERM;
665
Julia Lawall1bac92c2011-11-06 14:26:49 +0100666 err = kstrtoul(buf, 0, &state);
florian@mickler.org6c263612010-02-26 12:01:34 +0100667 if (err)
668 return err;
669
670 if (state > 1 )
671 return -EINVAL;
672
673 mutex_lock(&rfkill_global_mutex);
674 rfkill_set_block(rfkill, state);
675 mutex_unlock(&rfkill_global_mutex);
676
Alan Cox6f7c9622012-10-25 15:18:34 +0100677 return count;
florian@mickler.org6c263612010-02-26 12:01:34 +0100678}
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700679static DEVICE_ATTR_RW(soft);
florian@mickler.org6c263612010-02-26 12:01:34 +0100680
Johannes Berg19d337d2009-06-02 13:01:37 +0200681static u8 user_state_from_blocked(unsigned long state)
682{
683 if (state & RFKILL_BLOCK_HW)
684 return RFKILL_USER_STATE_HARD_BLOCKED;
685 if (state & RFKILL_BLOCK_SW)
686 return RFKILL_USER_STATE_SOFT_BLOCKED;
687
688 return RFKILL_USER_STATE_UNBLOCKED;
689}
690
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700691static ssize_t state_show(struct device *dev, struct device_attribute *attr,
692 char *buf)
Johannes Berg19d337d2009-06-02 13:01:37 +0200693{
694 struct rfkill *rfkill = to_rfkill(dev);
Johannes Berg19d337d2009-06-02 13:01:37 +0200695
florian@mickler.org819bfec2010-03-13 13:31:05 +0100696 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
Johannes Berg19d337d2009-06-02 13:01:37 +0200697}
698
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700699static ssize_t state_store(struct device *dev, struct device_attribute *attr,
700 const char *buf, size_t count)
Johannes Berg19d337d2009-06-02 13:01:37 +0200701{
Johannes Bergf54c1422009-07-10 21:41:39 +0200702 struct rfkill *rfkill = to_rfkill(dev);
703 unsigned long state;
704 int err;
Johannes Berg19d337d2009-06-02 13:01:37 +0200705
Johannes Bergf54c1422009-07-10 21:41:39 +0200706 if (!capable(CAP_NET_ADMIN))
707 return -EPERM;
708
Julia Lawall1bac92c2011-11-06 14:26:49 +0100709 err = kstrtoul(buf, 0, &state);
Johannes Bergf54c1422009-07-10 21:41:39 +0200710 if (err)
711 return err;
712
713 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
714 state != RFKILL_USER_STATE_UNBLOCKED)
715 return -EINVAL;
716
717 mutex_lock(&rfkill_global_mutex);
718 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
719 mutex_unlock(&rfkill_global_mutex);
720
Alan Cox6f7c9622012-10-25 15:18:34 +0100721 return count;
Johannes Berg19d337d2009-06-02 13:01:37 +0200722}
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700723static DEVICE_ATTR_RW(state);
Johannes Berg19d337d2009-06-02 13:01:37 +0200724
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700725static ssize_t claim_show(struct device *dev, struct device_attribute *attr,
726 char *buf)
Johannes Berg19d337d2009-06-02 13:01:37 +0200727{
728 return sprintf(buf, "%d\n", 0);
729}
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700730static DEVICE_ATTR_RO(claim);
Johannes Berg19d337d2009-06-02 13:01:37 +0200731
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700732static struct attribute *rfkill_dev_attrs[] = {
733 &dev_attr_name.attr,
734 &dev_attr_type.attr,
735 &dev_attr_index.attr,
736 &dev_attr_persistent.attr,
737 &dev_attr_state.attr,
738 &dev_attr_claim.attr,
739 &dev_attr_soft.attr,
740 &dev_attr_hard.attr,
741 NULL,
Johannes Berg19d337d2009-06-02 13:01:37 +0200742};
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700743ATTRIBUTE_GROUPS(rfkill_dev);
Johannes Berg19d337d2009-06-02 13:01:37 +0200744
745static void rfkill_release(struct device *dev)
746{
747 struct rfkill *rfkill = to_rfkill(dev);
748
749 kfree(rfkill);
750}
751
752static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
753{
754 struct rfkill *rfkill = to_rfkill(dev);
755 unsigned long flags;
756 u32 state;
757 int error;
758
759 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
760 if (error)
761 return error;
762 error = add_uevent_var(env, "RFKILL_TYPE=%s",
763 rfkill_get_type_str(rfkill->type));
764 if (error)
765 return error;
766 spin_lock_irqsave(&rfkill->lock, flags);
767 state = rfkill->state;
768 spin_unlock_irqrestore(&rfkill->lock, flags);
769 error = add_uevent_var(env, "RFKILL_STATE=%d",
770 user_state_from_blocked(state));
771 return error;
772}
773
774void rfkill_pause_polling(struct rfkill *rfkill)
775{
776 BUG_ON(!rfkill);
777
778 if (!rfkill->ops->poll)
779 return;
780
781 cancel_delayed_work_sync(&rfkill->poll_work);
782}
783EXPORT_SYMBOL(rfkill_pause_polling);
784
785void rfkill_resume_polling(struct rfkill *rfkill)
786{
787 BUG_ON(!rfkill);
788
789 if (!rfkill->ops->poll)
790 return;
791
Shaibal Dutta67235cb2014-01-30 14:43:34 -0800792 queue_delayed_work(system_power_efficient_wq,
793 &rfkill->poll_work, 0);
Johannes Berg19d337d2009-06-02 13:01:37 +0200794}
795EXPORT_SYMBOL(rfkill_resume_polling);
796
797static int rfkill_suspend(struct device *dev, pm_message_t state)
798{
799 struct rfkill *rfkill = to_rfkill(dev);
800
801 rfkill_pause_polling(rfkill);
802
Johannes Berg19d337d2009-06-02 13:01:37 +0200803 return 0;
804}
805
806static int rfkill_resume(struct device *dev)
807{
808 struct rfkill *rfkill = to_rfkill(dev);
809 bool cur;
810
Alan Jenkins06d5caf2009-06-16 15:39:51 +0100811 if (!rfkill->persistent) {
812 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
813 rfkill_set_block(rfkill, cur);
814 }
Johannes Berg19d337d2009-06-02 13:01:37 +0200815
Johannes Berg19d337d2009-06-02 13:01:37 +0200816 rfkill_resume_polling(rfkill);
817
818 return 0;
819}
820
821static struct class rfkill_class = {
822 .name = "rfkill",
823 .dev_release = rfkill_release,
Greg Kroah-Hartmane49df672013-07-24 15:05:36 -0700824 .dev_groups = rfkill_dev_groups,
Johannes Berg19d337d2009-06-02 13:01:37 +0200825 .dev_uevent = rfkill_dev_uevent,
826 .suspend = rfkill_suspend,
827 .resume = rfkill_resume,
828};
829
Johannes Berg60811622009-06-02 13:01:40 +0200830bool rfkill_blocked(struct rfkill *rfkill)
831{
832 unsigned long flags;
833 u32 state;
834
835 spin_lock_irqsave(&rfkill->lock, flags);
836 state = rfkill->state;
837 spin_unlock_irqrestore(&rfkill->lock, flags);
838
839 return !!(state & RFKILL_BLOCK_ANY);
840}
841EXPORT_SYMBOL(rfkill_blocked);
842
Johannes Berg19d337d2009-06-02 13:01:37 +0200843
844struct rfkill * __must_check rfkill_alloc(const char *name,
845 struct device *parent,
846 const enum rfkill_type type,
847 const struct rfkill_ops *ops,
848 void *ops_data)
849{
850 struct rfkill *rfkill;
851 struct device *dev;
852
853 if (WARN_ON(!ops))
854 return NULL;
855
856 if (WARN_ON(!ops->set_block))
857 return NULL;
858
859 if (WARN_ON(!name))
860 return NULL;
861
Johannes Bergc64fb012009-06-02 13:01:38 +0200862 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
Johannes Berg19d337d2009-06-02 13:01:37 +0200863 return NULL;
864
865 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
866 if (!rfkill)
867 return NULL;
868
869 spin_lock_init(&rfkill->lock);
870 INIT_LIST_HEAD(&rfkill->node);
871 rfkill->type = type;
872 rfkill->name = name;
873 rfkill->ops = ops;
874 rfkill->data = ops_data;
875
876 dev = &rfkill->dev;
877 dev->class = &rfkill_class;
878 dev->parent = parent;
879 device_initialize(dev);
880
881 return rfkill;
882}
883EXPORT_SYMBOL(rfkill_alloc);
884
885static void rfkill_poll(struct work_struct *work)
886{
887 struct rfkill *rfkill;
888
889 rfkill = container_of(work, struct rfkill, poll_work.work);
890
891 /*
892 * Poll hardware state -- driver will use one of the
893 * rfkill_set{,_hw,_sw}_state functions and use its
894 * return value to update the current status.
895 */
896 rfkill->ops->poll(rfkill, rfkill->data);
897
Shaibal Dutta67235cb2014-01-30 14:43:34 -0800898 queue_delayed_work(system_power_efficient_wq,
899 &rfkill->poll_work,
Johannes Berg19d337d2009-06-02 13:01:37 +0200900 round_jiffies_relative(POLL_INTERVAL));
901}
902
903static void rfkill_uevent_work(struct work_struct *work)
904{
905 struct rfkill *rfkill;
906
907 rfkill = container_of(work, struct rfkill, uevent_work);
908
Johannes Bergc64fb012009-06-02 13:01:38 +0200909 mutex_lock(&rfkill_global_mutex);
910 rfkill_event(rfkill);
911 mutex_unlock(&rfkill_global_mutex);
Johannes Berg19d337d2009-06-02 13:01:37 +0200912}
913
914static 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
927int __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
Johannes Bergc64fb012009-06-02 13:01:38 +0200942 rfkill->idx = rfkill_no;
Johannes Berg19d337d2009-06-02 13:01:37 +0200943 dev_set_name(dev, "rfkill%lu", rfkill_no);
944 rfkill_no++;
945
Johannes Berg19d337d2009-06-02 13:01:37 +0200946 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
Johannes Berg2ec2c682009-06-03 09:55:29 +0200958 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
959 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
960 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
961
962 if (rfkill->ops->poll)
Shaibal Dutta67235cb2014-01-30 14:43:34 -0800963 queue_delayed_work(system_power_efficient_wq,
964 &rfkill->poll_work,
Johannes Berg19d337d2009-06-02 13:01:37 +0200965 round_jiffies_relative(POLL_INTERVAL));
Alan Jenkinsb3fa1322009-06-08 13:27:27 +0100966
967 if (!rfkill->persistent || rfkill_epo_lock_active) {
968 schedule_work(&rfkill->sync_work);
969 } else {
970#ifdef CONFIG_RFKILL_INPUT
971 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
972
973 if (!atomic_read(&rfkill_input_disabled))
974 __rfkill_switch_all(rfkill->type, soft_blocked);
975#endif
976 }
Johannes Berg2ec2c682009-06-03 09:55:29 +0200977
Johannes Bergc64fb012009-06-02 13:01:38 +0200978 rfkill_send_events(rfkill, RFKILL_OP_ADD);
Johannes Berg19d337d2009-06-02 13:01:37 +0200979
980 mutex_unlock(&rfkill_global_mutex);
981 return 0;
982
983 devdel:
984 device_del(&rfkill->dev);
985 remove:
986 list_del_init(&rfkill->node);
987 unlock:
988 mutex_unlock(&rfkill_global_mutex);
989 return error;
990}
991EXPORT_SYMBOL(rfkill_register);
992
993void rfkill_unregister(struct rfkill *rfkill)
994{
995 BUG_ON(!rfkill);
996
997 if (rfkill->ops->poll)
998 cancel_delayed_work_sync(&rfkill->poll_work);
999
1000 cancel_work_sync(&rfkill->uevent_work);
1001 cancel_work_sync(&rfkill->sync_work);
1002
1003 rfkill->registered = false;
1004
1005 device_del(&rfkill->dev);
1006
1007 mutex_lock(&rfkill_global_mutex);
Johannes Bergc64fb012009-06-02 13:01:38 +02001008 rfkill_send_events(rfkill, RFKILL_OP_DEL);
Johannes Berg19d337d2009-06-02 13:01:37 +02001009 list_del_init(&rfkill->node);
1010 mutex_unlock(&rfkill_global_mutex);
1011
1012 rfkill_led_trigger_unregister(rfkill);
1013}
1014EXPORT_SYMBOL(rfkill_unregister);
1015
1016void rfkill_destroy(struct rfkill *rfkill)
1017{
1018 if (rfkill)
1019 put_device(&rfkill->dev);
1020}
1021EXPORT_SYMBOL(rfkill_destroy);
1022
Johannes Bergc64fb012009-06-02 13:01:38 +02001023static int rfkill_fop_open(struct inode *inode, struct file *file)
1024{
1025 struct rfkill_data *data;
1026 struct rfkill *rfkill;
1027 struct rfkill_int_event *ev, *tmp;
1028
1029 data = kzalloc(sizeof(*data), GFP_KERNEL);
1030 if (!data)
1031 return -ENOMEM;
1032
1033 INIT_LIST_HEAD(&data->events);
1034 mutex_init(&data->mtx);
1035 init_waitqueue_head(&data->read_wait);
1036
1037 mutex_lock(&rfkill_global_mutex);
1038 mutex_lock(&data->mtx);
1039 /*
1040 * start getting events from elsewhere but hold mtx to get
1041 * startup events added first
1042 */
Johannes Bergc64fb012009-06-02 13:01:38 +02001043
1044 list_for_each_entry(rfkill, &rfkill_list, node) {
1045 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1046 if (!ev)
1047 goto free;
1048 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1049 list_add_tail(&ev->list, &data->events);
1050 }
Julia Lawallbd2281b2011-05-13 15:52:10 +02001051 list_add(&data->list, &rfkill_fds);
Johannes Bergc64fb012009-06-02 13:01:38 +02001052 mutex_unlock(&data->mtx);
1053 mutex_unlock(&rfkill_global_mutex);
1054
1055 file->private_data = data;
1056
1057 return nonseekable_open(inode, file);
1058
1059 free:
1060 mutex_unlock(&data->mtx);
1061 mutex_unlock(&rfkill_global_mutex);
1062 mutex_destroy(&data->mtx);
1063 list_for_each_entry_safe(ev, tmp, &data->events, list)
1064 kfree(ev);
1065 kfree(data);
1066 return -ENOMEM;
1067}
1068
1069static unsigned int rfkill_fop_poll(struct file *file, poll_table *wait)
1070{
1071 struct rfkill_data *data = file->private_data;
1072 unsigned int res = POLLOUT | POLLWRNORM;
1073
1074 poll_wait(file, &data->read_wait, wait);
1075
1076 mutex_lock(&data->mtx);
1077 if (!list_empty(&data->events))
1078 res = POLLIN | POLLRDNORM;
1079 mutex_unlock(&data->mtx);
1080
1081 return res;
1082}
1083
1084static bool rfkill_readable(struct rfkill_data *data)
1085{
1086 bool r;
1087
1088 mutex_lock(&data->mtx);
1089 r = !list_empty(&data->events);
1090 mutex_unlock(&data->mtx);
1091
1092 return r;
1093}
1094
1095static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1096 size_t count, loff_t *pos)
1097{
1098 struct rfkill_data *data = file->private_data;
1099 struct rfkill_int_event *ev;
1100 unsigned long sz;
1101 int ret;
1102
1103 mutex_lock(&data->mtx);
1104
1105 while (list_empty(&data->events)) {
1106 if (file->f_flags & O_NONBLOCK) {
1107 ret = -EAGAIN;
1108 goto out;
1109 }
1110 mutex_unlock(&data->mtx);
1111 ret = wait_event_interruptible(data->read_wait,
1112 rfkill_readable(data));
1113 mutex_lock(&data->mtx);
1114
1115 if (ret)
1116 goto out;
1117 }
1118
1119 ev = list_first_entry(&data->events, struct rfkill_int_event,
1120 list);
1121
1122 sz = min_t(unsigned long, sizeof(ev->ev), count);
1123 ret = sz;
1124 if (copy_to_user(buf, &ev->ev, sz))
1125 ret = -EFAULT;
1126
1127 list_del(&ev->list);
1128 kfree(ev);
1129 out:
1130 mutex_unlock(&data->mtx);
1131 return ret;
1132}
1133
1134static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1135 size_t count, loff_t *pos)
1136{
1137 struct rfkill *rfkill;
1138 struct rfkill_event ev;
1139
1140 /* we don't need the 'hard' variable but accept it */
Johannes Berg1be491f2009-07-05 14:51:06 +02001141 if (count < RFKILL_EVENT_SIZE_V1 - 1)
Johannes Bergc64fb012009-06-02 13:01:38 +02001142 return -EINVAL;
1143
Johannes Berg1be491f2009-07-05 14:51:06 +02001144 /*
1145 * Copy as much data as we can accept into our 'ev' buffer,
1146 * but tell userspace how much we've copied so it can determine
1147 * our API version even in a write() call, if it cares.
1148 */
1149 count = min(count, sizeof(ev));
1150 if (copy_from_user(&ev, buf, count))
Johannes Bergc64fb012009-06-02 13:01:38 +02001151 return -EFAULT;
1152
1153 if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1154 return -EINVAL;
1155
1156 if (ev.type >= NUM_RFKILL_TYPES)
1157 return -EINVAL;
1158
1159 mutex_lock(&rfkill_global_mutex);
1160
1161 if (ev.op == RFKILL_OP_CHANGE_ALL) {
1162 if (ev.type == RFKILL_TYPE_ALL) {
1163 enum rfkill_type i;
1164 for (i = 0; i < NUM_RFKILL_TYPES; i++)
1165 rfkill_global_states[i].cur = ev.soft;
1166 } else {
1167 rfkill_global_states[ev.type].cur = ev.soft;
1168 }
1169 }
1170
1171 list_for_each_entry(rfkill, &rfkill_list, node) {
1172 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1173 continue;
1174
1175 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1176 continue;
1177
1178 rfkill_set_block(rfkill, ev.soft);
1179 }
1180 mutex_unlock(&rfkill_global_mutex);
1181
1182 return count;
1183}
1184
1185static int rfkill_fop_release(struct inode *inode, struct file *file)
1186{
1187 struct rfkill_data *data = file->private_data;
1188 struct rfkill_int_event *ev, *tmp;
1189
1190 mutex_lock(&rfkill_global_mutex);
1191 list_del(&data->list);
1192 mutex_unlock(&rfkill_global_mutex);
1193
1194 mutex_destroy(&data->mtx);
1195 list_for_each_entry_safe(ev, tmp, &data->events, list)
1196 kfree(ev);
1197
1198#ifdef CONFIG_RFKILL_INPUT
1199 if (data->input_handler)
Johannes Berg207ee162009-06-07 12:26:52 +02001200 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1201 printk(KERN_DEBUG "rfkill: input handler enabled\n");
Johannes Bergc64fb012009-06-02 13:01:38 +02001202#endif
1203
1204 kfree(data);
1205
1206 return 0;
1207}
1208
1209#ifdef CONFIG_RFKILL_INPUT
1210static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1211 unsigned long arg)
1212{
1213 struct rfkill_data *data = file->private_data;
1214
1215 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1216 return -ENOSYS;
1217
1218 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1219 return -ENOSYS;
1220
1221 mutex_lock(&data->mtx);
1222
1223 if (!data->input_handler) {
Johannes Berg207ee162009-06-07 12:26:52 +02001224 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1225 printk(KERN_DEBUG "rfkill: input handler disabled\n");
Johannes Bergc64fb012009-06-02 13:01:38 +02001226 data->input_handler = true;
1227 }
1228
1229 mutex_unlock(&data->mtx);
1230
1231 return 0;
1232}
1233#endif
1234
1235static const struct file_operations rfkill_fops = {
Johannes Berg45ba5642009-11-23 11:27:30 +01001236 .owner = THIS_MODULE,
Johannes Bergc64fb012009-06-02 13:01:38 +02001237 .open = rfkill_fop_open,
1238 .read = rfkill_fop_read,
1239 .write = rfkill_fop_write,
1240 .poll = rfkill_fop_poll,
1241 .release = rfkill_fop_release,
1242#ifdef CONFIG_RFKILL_INPUT
1243 .unlocked_ioctl = rfkill_fop_ioctl,
1244 .compat_ioctl = rfkill_fop_ioctl,
1245#endif
Arnd Bergmann6038f372010-08-15 18:52:59 +02001246 .llseek = no_llseek,
Johannes Bergc64fb012009-06-02 13:01:38 +02001247};
1248
1249static struct miscdevice rfkill_miscdev = {
1250 .name = "rfkill",
1251 .fops = &rfkill_fops,
1252 .minor = MISC_DYNAMIC_MINOR,
1253};
Johannes Berg19d337d2009-06-02 13:01:37 +02001254
1255static int __init rfkill_init(void)
1256{
1257 int error;
1258 int i;
1259
1260 for (i = 0; i < NUM_RFKILL_TYPES; i++)
Alan Jenkinsb3fa1322009-06-08 13:27:27 +01001261 rfkill_global_states[i].cur = !rfkill_default_state;
Johannes Berg19d337d2009-06-02 13:01:37 +02001262
1263 error = class_register(&rfkill_class);
1264 if (error)
1265 goto out;
1266
Johannes Bergc64fb012009-06-02 13:01:38 +02001267 error = misc_register(&rfkill_miscdev);
1268 if (error) {
1269 class_unregister(&rfkill_class);
1270 goto out;
1271 }
1272
Johannes Berg19d337d2009-06-02 13:01:37 +02001273#ifdef CONFIG_RFKILL_INPUT
1274 error = rfkill_handler_init();
Johannes Bergc64fb012009-06-02 13:01:38 +02001275 if (error) {
1276 misc_deregister(&rfkill_miscdev);
Johannes Berg19d337d2009-06-02 13:01:37 +02001277 class_unregister(&rfkill_class);
Johannes Bergc64fb012009-06-02 13:01:38 +02001278 goto out;
1279 }
Johannes Berg19d337d2009-06-02 13:01:37 +02001280#endif
1281
1282 out:
1283 return error;
1284}
1285subsys_initcall(rfkill_init);
1286
1287static void __exit rfkill_exit(void)
1288{
1289#ifdef CONFIG_RFKILL_INPUT
1290 rfkill_handler_exit();
1291#endif
Johannes Bergc64fb012009-06-02 13:01:38 +02001292 misc_deregister(&rfkill_miscdev);
Johannes Berg19d337d2009-06-02 13:01:37 +02001293 class_unregister(&rfkill_class);
1294}
1295module_exit(rfkill_exit);