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TOMOYO Linux Cross Reference
Linux/net/rfkill/core.c

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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, see <http://www.gnu.org/licenses/>.
 18  */
 19 
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/init.h>
 23 #include <linux/workqueue.h>
 24 #include <linux/capability.h>
 25 #include <linux/list.h>
 26 #include <linux/mutex.h>
 27 #include <linux/rfkill.h>
 28 #include <linux/sched.h>
 29 #include <linux/spinlock.h>
 30 #include <linux/device.h>
 31 #include <linux/miscdevice.h>
 32 #include <linux/wait.h>
 33 #include <linux/poll.h>
 34 #include <linux/fs.h>
 35 #include <linux/slab.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         bool prev, curr;
272         int err;
273 
274         if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
275                 return;
276 
277         /*
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);
286         prev = rfkill->state & RFKILL_BLOCK_SW;
287 
288         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 
301         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;
317         curr = rfkill->state & RFKILL_BLOCK_SW;
318         spin_unlock_irqrestore(&rfkill->lock, flags);
319 
320         rfkill_led_trigger_event(rfkill);
321 
322         if (prev != curr)
323                 rfkill_event(rfkill);
324 }
325 
326 #ifdef CONFIG_RFKILL_INPUT
327 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
328 
329 /**
330  * __rfkill_switch_all - Toggle state of all switches of given type
331  * @type: type of interfaces to be affected
332  * @blocked: the new state
333  *
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  */
340 static 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) {
346                 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
347                         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
356  * @blocked: the new state
357  *
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  */
363 void rfkill_switch_all(enum rfkill_type type, bool blocked)
364 {
365         if (atomic_read(&rfkill_input_disabled))
366                 return;
367 
368         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  */
385 void rfkill_epo(void)
386 {
387         struct rfkill *rfkill;
388         int i;
389 
390         if (atomic_read(&rfkill_input_disabled))
391                 return;
392 
393         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++) {
400                 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
401                 rfkill_global_states[i].cur = true;
402         }
403 
404         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  */
414 void rfkill_restore_states(void)
415 {
416         int i;
417 
418         if (atomic_read(&rfkill_input_disabled))
419                 return;
420 
421         mutex_lock(&rfkill_global_mutex);
422 
423         rfkill_epo_lock_active = false;
424         for (i = 0; i < NUM_RFKILL_TYPES; i++)
425                 __rfkill_switch_all(i, rfkill_global_states[i].sav);
426         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  */
435 void rfkill_remove_epo_lock(void)
436 {
437         if (atomic_read(&rfkill_input_disabled))
438                 return;
439 
440         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  */
454 bool 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  */
466 bool rfkill_get_global_sw_state(const enum rfkill_type type)
467 {
468         return rfkill_global_states[type].cur;
469 }
470 #endif
471 
472 
473 bool 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 }
487 EXPORT_SYMBOL(rfkill_set_hw_state);
488 
489 static 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 
503 bool 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 
517         if (!rfkill->registered)
518                 return blocked;
519 
520         if (prev != blocked && !hwblock)
521                 schedule_work(&rfkill->uevent_work);
522 
523         rfkill_led_trigger_event(rfkill);
524 
525         return blocked;
526 }
527 EXPORT_SYMBOL(rfkill_set_sw_state);
528 
529 void 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 }
541 EXPORT_SYMBOL(rfkill_init_sw_state);
542 
543 void 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);
559         if (hw)
560                 rfkill->state |= RFKILL_BLOCK_HW;
561         else
562                 rfkill->state &= ~RFKILL_BLOCK_HW;
563 
564         spin_unlock_irqrestore(&rfkill->lock, flags);
565 
566         if (!rfkill->registered) {
567                 rfkill->persistent = true;
568         } else {
569                 if (swprev != sw || hwprev != hw)
570                         schedule_work(&rfkill->uevent_work);
571 
572                 rfkill_led_trigger_event(rfkill);
573         }
574 }
575 EXPORT_SYMBOL(rfkill_set_states);
576 
577 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
578                          char *buf)
579 {
580         struct rfkill *rfkill = to_rfkill(dev);
581 
582         return sprintf(buf, "%s\n", rfkill->name);
583 }
584 static DEVICE_ATTR_RO(name);
585 
586 static const char *rfkill_get_type_str(enum rfkill_type type)
587 {
588         BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_NFC + 1);
589 
590         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";
601         case RFKILL_TYPE_GPS:
602                 return "gps";
603         case RFKILL_TYPE_FM:
604                 return "fm";
605         case RFKILL_TYPE_NFC:
606                 return "nfc";
607         default:
608                 BUG();
609         }
610 }
611 
612 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
613                          char *buf)
614 {
615         struct rfkill *rfkill = to_rfkill(dev);
616 
617         return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
618 }
619 static DEVICE_ATTR_RO(type);
620 
621 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
622                           char *buf)
623 {
624         struct rfkill *rfkill = to_rfkill(dev);
625 
626         return sprintf(buf, "%d\n", rfkill->idx);
627 }
628 static DEVICE_ATTR_RO(index);
629 
630 static ssize_t persistent_show(struct device *dev,
631                                struct device_attribute *attr, char *buf)
632 {
633         struct rfkill *rfkill = to_rfkill(dev);
634 
635         return sprintf(buf, "%d\n", rfkill->persistent);
636 }
637 static DEVICE_ATTR_RO(persistent);
638 
639 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
640                          char *buf)
641 {
642         struct rfkill *rfkill = to_rfkill(dev);
643 
644         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
645 }
646 static DEVICE_ATTR_RO(hard);
647 
648 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
649                          char *buf)
650 {
651         struct rfkill *rfkill = to_rfkill(dev);
652 
653         return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
654 }
655 
656 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
657                           const char *buf, size_t count)
658 {
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 
666         err = kstrtoul(buf, 0, &state);
667         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 
677         return count;
678 }
679 static DEVICE_ATTR_RW(soft);
680 
681 static 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 
691 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
692                           char *buf)
693 {
694         struct rfkill *rfkill = to_rfkill(dev);
695 
696         return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
697 }
698 
699 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
700                            const char *buf, size_t count)
701 {
702         struct rfkill *rfkill = to_rfkill(dev);
703         unsigned long state;
704         int err;
705 
706         if (!capable(CAP_NET_ADMIN))
707                 return -EPERM;
708 
709         err = kstrtoul(buf, 0, &state);
710         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 
721         return count;
722 }
723 static DEVICE_ATTR_RW(state);
724 
725 static ssize_t claim_show(struct device *dev, struct device_attribute *attr,
726                           char *buf)
727 {
728         return sprintf(buf, "%d\n", 0);
729 }
730 static DEVICE_ATTR_RO(claim);
731 
732 static 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,
742 };
743 ATTRIBUTE_GROUPS(rfkill_dev);
744 
745 static void rfkill_release(struct device *dev)
746 {
747         struct rfkill *rfkill = to_rfkill(dev);
748 
749         kfree(rfkill);
750 }
751 
752 static 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 
774 void 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 }
783 EXPORT_SYMBOL(rfkill_pause_polling);
784 
785 void rfkill_resume_polling(struct rfkill *rfkill)
786 {
787         BUG_ON(!rfkill);
788 
789         if (!rfkill->ops->poll)
790                 return;
791 
792         queue_delayed_work(system_power_efficient_wq,
793                            &rfkill->poll_work, 0);
794 }
795 EXPORT_SYMBOL(rfkill_resume_polling);
796 
797 static 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 
803         return 0;
804 }
805 
806 static int rfkill_resume(struct device *dev)
807 {
808         struct rfkill *rfkill = to_rfkill(dev);
809         bool cur;
810 
811         if (!rfkill->persistent) {
812                 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
813                 rfkill_set_block(rfkill, cur);
814         }
815 
816         rfkill_resume_polling(rfkill);
817 
818         return 0;
819 }
820 
821 static struct class rfkill_class = {
822         .name           = "rfkill",
823         .dev_release    = rfkill_release,
824         .dev_groups     = rfkill_dev_groups,
825         .dev_uevent     = rfkill_dev_uevent,
826         .suspend        = rfkill_suspend,
827         .resume         = rfkill_resume,
828 };
829 
830 bool 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 }
841 EXPORT_SYMBOL(rfkill_blocked);
842 
843 
844 struct 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 
862         if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
863                 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 }
883 EXPORT_SYMBOL(rfkill_alloc);
884 
885 static 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 
898         queue_delayed_work(system_power_efficient_wq,
899                 &rfkill->poll_work,
900                 round_jiffies_relative(POLL_INTERVAL));
901 }
902 
903 static void rfkill_uevent_work(struct work_struct *work)
904 {
905         struct rfkill *rfkill;
906 
907         rfkill = container_of(work, struct rfkill, uevent_work);
908 
909         mutex_lock(&rfkill_global_mutex);
910         rfkill_event(rfkill);
911         mutex_unlock(&rfkill_global_mutex);
912 }
913 
914 static void rfkill_sync_work(struct work_struct *work)
915 {
916         struct rfkill *rfkill;
917         bool cur;
918 
919         rfkill = container_of(work, struct rfkill, sync_work);
920 
921         mutex_lock(&rfkill_global_mutex);
922         cur = rfkill_global_states[rfkill->type].cur;
923         rfkill_set_block(rfkill, cur);
924         mutex_unlock(&rfkill_global_mutex);
925 }
926 
927 int __must_check rfkill_register(struct rfkill *rfkill)
928 {
929         static unsigned long rfkill_no;
930         struct device *dev = &rfkill->dev;
931         int error;
932 
933         BUG_ON(!rfkill);
934 
935         mutex_lock(&rfkill_global_mutex);
936 
937         if (rfkill->registered) {
938                 error = -EALREADY;
939                 goto unlock;
940         }
941 
942         rfkill->idx = rfkill_no;
943         dev_set_name(dev, "rfkill%lu", rfkill_no);
944         rfkill_no++;
945 
946         list_add_tail(&rfkill->node, &rfkill_list);
947 
948         error = device_add(dev);
949         if (error)
950                 goto remove;
951 
952         error = rfkill_led_trigger_register(rfkill);
953         if (error)
954                 goto devdel;
955 
956         rfkill->registered = true;
957 
958         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)
963                 queue_delayed_work(system_power_efficient_wq,
964                         &rfkill->poll_work,
965                         round_jiffies_relative(POLL_INTERVAL));
966 
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         }
977 
978         rfkill_send_events(rfkill, RFKILL_OP_ADD);
979 
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 }
991 EXPORT_SYMBOL(rfkill_register);
992 
993 void 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);
1008         rfkill_send_events(rfkill, RFKILL_OP_DEL);
1009         list_del_init(&rfkill->node);
1010         mutex_unlock(&rfkill_global_mutex);
1011 
1012         rfkill_led_trigger_unregister(rfkill);
1013 }
1014 EXPORT_SYMBOL(rfkill_unregister);
1015 
1016 void rfkill_destroy(struct rfkill *rfkill)
1017 {
1018         if (rfkill)
1019                 put_device(&rfkill->dev);
1020 }
1021 EXPORT_SYMBOL(rfkill_destroy);
1022 
1023 static 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          */
1043 
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         }
1051         list_add(&data->list, &rfkill_fds);
1052         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 
1069 static 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 
1084 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1085                                size_t count, loff_t *pos)
1086 {
1087         struct rfkill_data *data = file->private_data;
1088         struct rfkill_int_event *ev;
1089         unsigned long sz;
1090         int ret;
1091 
1092         mutex_lock(&data->mtx);
1093 
1094         while (list_empty(&data->events)) {
1095                 if (file->f_flags & O_NONBLOCK) {
1096                         ret = -EAGAIN;
1097                         goto out;
1098                 }
1099                 mutex_unlock(&data->mtx);
1100                 /* since we re-check and it just compares pointers,
1101                  * using !list_empty() without locking isn't a problem
1102                  */
1103                 ret = wait_event_interruptible(data->read_wait,
1104                                                !list_empty(&data->events));
1105                 mutex_lock(&data->mtx);
1106 
1107                 if (ret)
1108                         goto out;
1109         }
1110 
1111         ev = list_first_entry(&data->events, struct rfkill_int_event,
1112                                 list);
1113 
1114         sz = min_t(unsigned long, sizeof(ev->ev), count);
1115         ret = sz;
1116         if (copy_to_user(buf, &ev->ev, sz))
1117                 ret = -EFAULT;
1118 
1119         list_del(&ev->list);
1120         kfree(ev);
1121  out:
1122         mutex_unlock(&data->mtx);
1123         return ret;
1124 }
1125 
1126 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1127                                 size_t count, loff_t *pos)
1128 {
1129         struct rfkill *rfkill;
1130         struct rfkill_event ev;
1131 
1132         /* we don't need the 'hard' variable but accept it */
1133         if (count < RFKILL_EVENT_SIZE_V1 - 1)
1134                 return -EINVAL;
1135 
1136         /*
1137          * Copy as much data as we can accept into our 'ev' buffer,
1138          * but tell userspace how much we've copied so it can determine
1139          * our API version even in a write() call, if it cares.
1140          */
1141         count = min(count, sizeof(ev));
1142         if (copy_from_user(&ev, buf, count))
1143                 return -EFAULT;
1144 
1145         if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
1146                 return -EINVAL;
1147 
1148         if (ev.type >= NUM_RFKILL_TYPES)
1149                 return -EINVAL;
1150 
1151         mutex_lock(&rfkill_global_mutex);
1152 
1153         if (ev.op == RFKILL_OP_CHANGE_ALL) {
1154                 if (ev.type == RFKILL_TYPE_ALL) {
1155                         enum rfkill_type i;
1156                         for (i = 0; i < NUM_RFKILL_TYPES; i++)
1157                                 rfkill_global_states[i].cur = ev.soft;
1158                 } else {
1159                         rfkill_global_states[ev.type].cur = ev.soft;
1160                 }
1161         }
1162 
1163         list_for_each_entry(rfkill, &rfkill_list, node) {
1164                 if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
1165                         continue;
1166 
1167                 if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
1168                         continue;
1169 
1170                 rfkill_set_block(rfkill, ev.soft);
1171         }
1172         mutex_unlock(&rfkill_global_mutex);
1173 
1174         return count;
1175 }
1176 
1177 static int rfkill_fop_release(struct inode *inode, struct file *file)
1178 {
1179         struct rfkill_data *data = file->private_data;
1180         struct rfkill_int_event *ev, *tmp;
1181 
1182         mutex_lock(&rfkill_global_mutex);
1183         list_del(&data->list);
1184         mutex_unlock(&rfkill_global_mutex);
1185 
1186         mutex_destroy(&data->mtx);
1187         list_for_each_entry_safe(ev, tmp, &data->events, list)
1188                 kfree(ev);
1189 
1190 #ifdef CONFIG_RFKILL_INPUT
1191         if (data->input_handler)
1192                 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1193                         printk(KERN_DEBUG "rfkill: input handler enabled\n");
1194 #endif
1195 
1196         kfree(data);
1197 
1198         return 0;
1199 }
1200 
1201 #ifdef CONFIG_RFKILL_INPUT
1202 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1203                              unsigned long arg)
1204 {
1205         struct rfkill_data *data = file->private_data;
1206 
1207         if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1208                 return -ENOSYS;
1209 
1210         if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1211                 return -ENOSYS;
1212 
1213         mutex_lock(&data->mtx);
1214 
1215         if (!data->input_handler) {
1216                 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1217                         printk(KERN_DEBUG "rfkill: input handler disabled\n");
1218                 data->input_handler = true;
1219         }
1220 
1221         mutex_unlock(&data->mtx);
1222 
1223         return 0;
1224 }
1225 #endif
1226 
1227 static const struct file_operations rfkill_fops = {
1228         .owner          = THIS_MODULE,
1229         .open           = rfkill_fop_open,
1230         .read           = rfkill_fop_read,
1231         .write          = rfkill_fop_write,
1232         .poll           = rfkill_fop_poll,
1233         .release        = rfkill_fop_release,
1234 #ifdef CONFIG_RFKILL_INPUT
1235         .unlocked_ioctl = rfkill_fop_ioctl,
1236         .compat_ioctl   = rfkill_fop_ioctl,
1237 #endif
1238         .llseek         = no_llseek,
1239 };
1240 
1241 static struct miscdevice rfkill_miscdev = {
1242         .name   = "rfkill",
1243         .fops   = &rfkill_fops,
1244         .minor  = MISC_DYNAMIC_MINOR,
1245 };
1246 
1247 static int __init rfkill_init(void)
1248 {
1249         int error;
1250         int i;
1251 
1252         for (i = 0; i < NUM_RFKILL_TYPES; i++)
1253                 rfkill_global_states[i].cur = !rfkill_default_state;
1254 
1255         error = class_register(&rfkill_class);
1256         if (error)
1257                 goto out;
1258 
1259         error = misc_register(&rfkill_miscdev);
1260         if (error) {
1261                 class_unregister(&rfkill_class);
1262                 goto out;
1263         }
1264 
1265 #ifdef CONFIG_RFKILL_INPUT
1266         error = rfkill_handler_init();
1267         if (error) {
1268                 misc_deregister(&rfkill_miscdev);
1269                 class_unregister(&rfkill_class);
1270                 goto out;
1271         }
1272 #endif
1273 
1274  out:
1275         return error;
1276 }
1277 subsys_initcall(rfkill_init);
1278 
1279 static void __exit rfkill_exit(void)
1280 {
1281 #ifdef CONFIG_RFKILL_INPUT
1282         rfkill_handler_exit();
1283 #endif
1284         misc_deregister(&rfkill_miscdev);
1285         class_unregister(&rfkill_class);
1286 }
1287 module_exit(rfkill_exit);
1288 

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