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

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