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[linux/fpc-iii.git] / net / rfkill / core.c
blob971c73c7d34cbcab766cd7bae1e1305a909c25f4
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2006 - 2007 Ivo van Doorn
4 * Copyright (C) 2007 Dmitry Torokhov
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
6 */
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/workqueue.h>
12 #include <linux/capability.h>
13 #include <linux/list.h>
14 #include <linux/mutex.h>
15 #include <linux/rfkill.h>
16 #include <linux/sched.h>
17 #include <linux/spinlock.h>
18 #include <linux/device.h>
19 #include <linux/miscdevice.h>
20 #include <linux/wait.h>
21 #include <linux/poll.h>
22 #include <linux/fs.h>
23 #include <linux/slab.h>
25 #include "rfkill.h"
27 #define POLL_INTERVAL (5 * HZ)
29 #define RFKILL_BLOCK_HW BIT(0)
30 #define RFKILL_BLOCK_SW BIT(1)
31 #define RFKILL_BLOCK_SW_PREV BIT(2)
32 #define RFKILL_BLOCK_ANY (RFKILL_BLOCK_HW |\
33 RFKILL_BLOCK_SW |\
34 RFKILL_BLOCK_SW_PREV)
35 #define RFKILL_BLOCK_SW_SETCALL BIT(31)
37 struct rfkill {
38 spinlock_t lock;
40 enum rfkill_type type;
42 unsigned long state;
44 u32 idx;
46 bool registered;
47 bool persistent;
48 bool polling_paused;
49 bool suspended;
51 const struct rfkill_ops *ops;
52 void *data;
54 #ifdef CONFIG_RFKILL_LEDS
55 struct led_trigger led_trigger;
56 const char *ledtrigname;
57 #endif
59 struct device dev;
60 struct list_head node;
62 struct delayed_work poll_work;
63 struct work_struct uevent_work;
64 struct work_struct sync_work;
65 char name[];
67 #define to_rfkill(d) container_of(d, struct rfkill, dev)
69 struct rfkill_int_event {
70 struct list_head list;
71 struct rfkill_event ev;
74 struct rfkill_data {
75 struct list_head list;
76 struct list_head events;
77 struct mutex mtx;
78 wait_queue_head_t read_wait;
79 bool input_handler;
83 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
84 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
85 MODULE_DESCRIPTION("RF switch support");
86 MODULE_LICENSE("GPL");
90 * The locking here should be made much smarter, we currently have
91 * a bit of a stupid situation because drivers might want to register
92 * the rfkill struct under their own lock, and take this lock during
93 * rfkill method calls -- which will cause an AB-BA deadlock situation.
95 * To fix that, we need to rework this code here to be mostly lock-free
96 * and only use the mutex for list manipulations, not to protect the
97 * various other global variables. Then we can avoid holding the mutex
98 * around driver operations, and all is happy.
100 static LIST_HEAD(rfkill_list); /* list of registered rf switches */
101 static DEFINE_MUTEX(rfkill_global_mutex);
102 static LIST_HEAD(rfkill_fds); /* list of open fds of /dev/rfkill */
104 static unsigned int rfkill_default_state = 1;
105 module_param_named(default_state, rfkill_default_state, uint, 0444);
106 MODULE_PARM_DESC(default_state,
107 "Default initial state for all radio types, 0 = radio off");
109 static struct {
110 bool cur, sav;
111 } rfkill_global_states[NUM_RFKILL_TYPES];
113 static bool rfkill_epo_lock_active;
116 #ifdef CONFIG_RFKILL_LEDS
117 static void rfkill_led_trigger_event(struct rfkill *rfkill)
119 struct led_trigger *trigger;
121 if (!rfkill->registered)
122 return;
124 trigger = &rfkill->led_trigger;
126 if (rfkill->state & RFKILL_BLOCK_ANY)
127 led_trigger_event(trigger, LED_OFF);
128 else
129 led_trigger_event(trigger, LED_FULL);
132 static int rfkill_led_trigger_activate(struct led_classdev *led)
134 struct rfkill *rfkill;
136 rfkill = container_of(led->trigger, struct rfkill, led_trigger);
138 rfkill_led_trigger_event(rfkill);
140 return 0;
143 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
145 return rfkill->led_trigger.name;
147 EXPORT_SYMBOL(rfkill_get_led_trigger_name);
149 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
151 BUG_ON(!rfkill);
153 rfkill->ledtrigname = name;
155 EXPORT_SYMBOL(rfkill_set_led_trigger_name);
157 static int rfkill_led_trigger_register(struct rfkill *rfkill)
159 rfkill->led_trigger.name = rfkill->ledtrigname
160 ? : dev_name(&rfkill->dev);
161 rfkill->led_trigger.activate = rfkill_led_trigger_activate;
162 return led_trigger_register(&rfkill->led_trigger);
165 static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
167 led_trigger_unregister(&rfkill->led_trigger);
170 static struct led_trigger rfkill_any_led_trigger;
171 static struct led_trigger rfkill_none_led_trigger;
172 static struct work_struct rfkill_global_led_trigger_work;
174 static void rfkill_global_led_trigger_worker(struct work_struct *work)
176 enum led_brightness brightness = LED_OFF;
177 struct rfkill *rfkill;
179 mutex_lock(&rfkill_global_mutex);
180 list_for_each_entry(rfkill, &rfkill_list, node) {
181 if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
182 brightness = LED_FULL;
183 break;
186 mutex_unlock(&rfkill_global_mutex);
188 led_trigger_event(&rfkill_any_led_trigger, brightness);
189 led_trigger_event(&rfkill_none_led_trigger,
190 brightness == LED_OFF ? LED_FULL : LED_OFF);
193 static void rfkill_global_led_trigger_event(void)
195 schedule_work(&rfkill_global_led_trigger_work);
198 static int rfkill_global_led_trigger_register(void)
200 int ret;
202 INIT_WORK(&rfkill_global_led_trigger_work,
203 rfkill_global_led_trigger_worker);
205 rfkill_any_led_trigger.name = "rfkill-any";
206 ret = led_trigger_register(&rfkill_any_led_trigger);
207 if (ret)
208 return ret;
210 rfkill_none_led_trigger.name = "rfkill-none";
211 ret = led_trigger_register(&rfkill_none_led_trigger);
212 if (ret)
213 led_trigger_unregister(&rfkill_any_led_trigger);
214 else
215 /* Delay activation until all global triggers are registered */
216 rfkill_global_led_trigger_event();
218 return ret;
221 static void rfkill_global_led_trigger_unregister(void)
223 led_trigger_unregister(&rfkill_none_led_trigger);
224 led_trigger_unregister(&rfkill_any_led_trigger);
225 cancel_work_sync(&rfkill_global_led_trigger_work);
227 #else
228 static void rfkill_led_trigger_event(struct rfkill *rfkill)
232 static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
234 return 0;
237 static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
241 static void rfkill_global_led_trigger_event(void)
245 static int rfkill_global_led_trigger_register(void)
247 return 0;
250 static void rfkill_global_led_trigger_unregister(void)
253 #endif /* CONFIG_RFKILL_LEDS */
255 static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
256 enum rfkill_operation op)
258 unsigned long flags;
260 ev->idx = rfkill->idx;
261 ev->type = rfkill->type;
262 ev->op = op;
264 spin_lock_irqsave(&rfkill->lock, flags);
265 ev->hard = !!(rfkill->state & RFKILL_BLOCK_HW);
266 ev->soft = !!(rfkill->state & (RFKILL_BLOCK_SW |
267 RFKILL_BLOCK_SW_PREV));
268 spin_unlock_irqrestore(&rfkill->lock, flags);
271 static void rfkill_send_events(struct rfkill *rfkill, enum rfkill_operation op)
273 struct rfkill_data *data;
274 struct rfkill_int_event *ev;
276 list_for_each_entry(data, &rfkill_fds, list) {
277 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
278 if (!ev)
279 continue;
280 rfkill_fill_event(&ev->ev, rfkill, op);
281 mutex_lock(&data->mtx);
282 list_add_tail(&ev->list, &data->events);
283 mutex_unlock(&data->mtx);
284 wake_up_interruptible(&data->read_wait);
288 static void rfkill_event(struct rfkill *rfkill)
290 if (!rfkill->registered)
291 return;
293 kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
295 /* also send event to /dev/rfkill */
296 rfkill_send_events(rfkill, RFKILL_OP_CHANGE);
300 * rfkill_set_block - wrapper for set_block method
302 * @rfkill: the rfkill struct to use
303 * @blocked: the new software state
305 * Calls the set_block method (when applicable) and handles notifications
306 * etc. as well.
308 static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
310 unsigned long flags;
311 bool prev, curr;
312 int err;
314 if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
315 return;
318 * Some platforms (...!) generate input events which affect the
319 * _hard_ kill state -- whenever something tries to change the
320 * current software state query the hardware state too.
322 if (rfkill->ops->query)
323 rfkill->ops->query(rfkill, rfkill->data);
325 spin_lock_irqsave(&rfkill->lock, flags);
326 prev = rfkill->state & RFKILL_BLOCK_SW;
328 if (prev)
329 rfkill->state |= RFKILL_BLOCK_SW_PREV;
330 else
331 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
333 if (blocked)
334 rfkill->state |= RFKILL_BLOCK_SW;
335 else
336 rfkill->state &= ~RFKILL_BLOCK_SW;
338 rfkill->state |= RFKILL_BLOCK_SW_SETCALL;
339 spin_unlock_irqrestore(&rfkill->lock, flags);
341 err = rfkill->ops->set_block(rfkill->data, blocked);
343 spin_lock_irqsave(&rfkill->lock, flags);
344 if (err) {
346 * Failed -- reset status to _PREV, which may be different
347 * from what we have set _PREV to earlier in this function
348 * if rfkill_set_sw_state was invoked.
350 if (rfkill->state & RFKILL_BLOCK_SW_PREV)
351 rfkill->state |= RFKILL_BLOCK_SW;
352 else
353 rfkill->state &= ~RFKILL_BLOCK_SW;
355 rfkill->state &= ~RFKILL_BLOCK_SW_SETCALL;
356 rfkill->state &= ~RFKILL_BLOCK_SW_PREV;
357 curr = rfkill->state & RFKILL_BLOCK_SW;
358 spin_unlock_irqrestore(&rfkill->lock, flags);
360 rfkill_led_trigger_event(rfkill);
361 rfkill_global_led_trigger_event();
363 if (prev != curr)
364 rfkill_event(rfkill);
367 static void rfkill_update_global_state(enum rfkill_type type, bool blocked)
369 int i;
371 if (type != RFKILL_TYPE_ALL) {
372 rfkill_global_states[type].cur = blocked;
373 return;
376 for (i = 0; i < NUM_RFKILL_TYPES; i++)
377 rfkill_global_states[i].cur = blocked;
380 #ifdef CONFIG_RFKILL_INPUT
381 static atomic_t rfkill_input_disabled = ATOMIC_INIT(0);
384 * __rfkill_switch_all - Toggle state of all switches of given type
385 * @type: type of interfaces to be affected
386 * @blocked: the new state
388 * This function sets the state of all switches of given type,
389 * unless a specific switch is suspended.
391 * Caller must have acquired rfkill_global_mutex.
393 static void __rfkill_switch_all(const enum rfkill_type type, bool blocked)
395 struct rfkill *rfkill;
397 rfkill_update_global_state(type, blocked);
398 list_for_each_entry(rfkill, &rfkill_list, node) {
399 if (rfkill->type != type && type != RFKILL_TYPE_ALL)
400 continue;
402 rfkill_set_block(rfkill, blocked);
407 * rfkill_switch_all - Toggle state of all switches of given type
408 * @type: type of interfaces to be affected
409 * @blocked: the new state
411 * Acquires rfkill_global_mutex and calls __rfkill_switch_all(@type, @state).
412 * Please refer to __rfkill_switch_all() for details.
414 * Does nothing if the EPO lock is active.
416 void rfkill_switch_all(enum rfkill_type type, bool blocked)
418 if (atomic_read(&rfkill_input_disabled))
419 return;
421 mutex_lock(&rfkill_global_mutex);
423 if (!rfkill_epo_lock_active)
424 __rfkill_switch_all(type, blocked);
426 mutex_unlock(&rfkill_global_mutex);
430 * rfkill_epo - emergency power off all transmitters
432 * This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
433 * ignoring everything in its path but rfkill_global_mutex and rfkill->mutex.
435 * The global state before the EPO is saved and can be restored later
436 * using rfkill_restore_states().
438 void rfkill_epo(void)
440 struct rfkill *rfkill;
441 int i;
443 if (atomic_read(&rfkill_input_disabled))
444 return;
446 mutex_lock(&rfkill_global_mutex);
448 rfkill_epo_lock_active = true;
449 list_for_each_entry(rfkill, &rfkill_list, node)
450 rfkill_set_block(rfkill, true);
452 for (i = 0; i < NUM_RFKILL_TYPES; i++) {
453 rfkill_global_states[i].sav = rfkill_global_states[i].cur;
454 rfkill_global_states[i].cur = true;
457 mutex_unlock(&rfkill_global_mutex);
461 * rfkill_restore_states - restore global states
463 * Restore (and sync switches to) the global state from the
464 * states in rfkill_default_states. This can undo the effects of
465 * a call to rfkill_epo().
467 void rfkill_restore_states(void)
469 int i;
471 if (atomic_read(&rfkill_input_disabled))
472 return;
474 mutex_lock(&rfkill_global_mutex);
476 rfkill_epo_lock_active = false;
477 for (i = 0; i < NUM_RFKILL_TYPES; i++)
478 __rfkill_switch_all(i, rfkill_global_states[i].sav);
479 mutex_unlock(&rfkill_global_mutex);
483 * rfkill_remove_epo_lock - unlock state changes
485 * Used by rfkill-input manually unlock state changes, when
486 * the EPO switch is deactivated.
488 void rfkill_remove_epo_lock(void)
490 if (atomic_read(&rfkill_input_disabled))
491 return;
493 mutex_lock(&rfkill_global_mutex);
494 rfkill_epo_lock_active = false;
495 mutex_unlock(&rfkill_global_mutex);
499 * rfkill_is_epo_lock_active - returns true EPO is active
501 * Returns 0 (false) if there is NOT an active EPO condition,
502 * and 1 (true) if there is an active EPO condition, which
503 * locks all radios in one of the BLOCKED states.
505 * Can be called in atomic context.
507 bool rfkill_is_epo_lock_active(void)
509 return rfkill_epo_lock_active;
513 * rfkill_get_global_sw_state - returns global state for a type
514 * @type: the type to get the global state of
516 * Returns the current global state for a given wireless
517 * device type.
519 bool rfkill_get_global_sw_state(const enum rfkill_type type)
521 return rfkill_global_states[type].cur;
523 #endif
525 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
527 unsigned long flags;
528 bool ret, prev;
530 BUG_ON(!rfkill);
532 spin_lock_irqsave(&rfkill->lock, flags);
533 prev = !!(rfkill->state & RFKILL_BLOCK_HW);
534 if (blocked)
535 rfkill->state |= RFKILL_BLOCK_HW;
536 else
537 rfkill->state &= ~RFKILL_BLOCK_HW;
538 ret = !!(rfkill->state & RFKILL_BLOCK_ANY);
539 spin_unlock_irqrestore(&rfkill->lock, flags);
541 rfkill_led_trigger_event(rfkill);
542 rfkill_global_led_trigger_event();
544 if (rfkill->registered && prev != blocked)
545 schedule_work(&rfkill->uevent_work);
547 return ret;
549 EXPORT_SYMBOL(rfkill_set_hw_state);
551 static void __rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
553 u32 bit = RFKILL_BLOCK_SW;
555 /* if in a ops->set_block right now, use other bit */
556 if (rfkill->state & RFKILL_BLOCK_SW_SETCALL)
557 bit = RFKILL_BLOCK_SW_PREV;
559 if (blocked)
560 rfkill->state |= bit;
561 else
562 rfkill->state &= ~bit;
565 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
567 unsigned long flags;
568 bool prev, hwblock;
570 BUG_ON(!rfkill);
572 spin_lock_irqsave(&rfkill->lock, flags);
573 prev = !!(rfkill->state & RFKILL_BLOCK_SW);
574 __rfkill_set_sw_state(rfkill, blocked);
575 hwblock = !!(rfkill->state & RFKILL_BLOCK_HW);
576 blocked = blocked || hwblock;
577 spin_unlock_irqrestore(&rfkill->lock, flags);
579 if (!rfkill->registered)
580 return blocked;
582 if (prev != blocked && !hwblock)
583 schedule_work(&rfkill->uevent_work);
585 rfkill_led_trigger_event(rfkill);
586 rfkill_global_led_trigger_event();
588 return blocked;
590 EXPORT_SYMBOL(rfkill_set_sw_state);
592 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
594 unsigned long flags;
596 BUG_ON(!rfkill);
597 BUG_ON(rfkill->registered);
599 spin_lock_irqsave(&rfkill->lock, flags);
600 __rfkill_set_sw_state(rfkill, blocked);
601 rfkill->persistent = true;
602 spin_unlock_irqrestore(&rfkill->lock, flags);
604 EXPORT_SYMBOL(rfkill_init_sw_state);
606 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
608 unsigned long flags;
609 bool swprev, hwprev;
611 BUG_ON(!rfkill);
613 spin_lock_irqsave(&rfkill->lock, flags);
616 * No need to care about prev/setblock ... this is for uevent only
617 * and that will get triggered by rfkill_set_block anyway.
619 swprev = !!(rfkill->state & RFKILL_BLOCK_SW);
620 hwprev = !!(rfkill->state & RFKILL_BLOCK_HW);
621 __rfkill_set_sw_state(rfkill, sw);
622 if (hw)
623 rfkill->state |= RFKILL_BLOCK_HW;
624 else
625 rfkill->state &= ~RFKILL_BLOCK_HW;
627 spin_unlock_irqrestore(&rfkill->lock, flags);
629 if (!rfkill->registered) {
630 rfkill->persistent = true;
631 } else {
632 if (swprev != sw || hwprev != hw)
633 schedule_work(&rfkill->uevent_work);
635 rfkill_led_trigger_event(rfkill);
636 rfkill_global_led_trigger_event();
639 EXPORT_SYMBOL(rfkill_set_states);
641 static const char * const rfkill_types[] = {
642 NULL, /* RFKILL_TYPE_ALL */
643 "wlan",
644 "bluetooth",
645 "ultrawideband",
646 "wimax",
647 "wwan",
648 "gps",
649 "fm",
650 "nfc",
653 enum rfkill_type rfkill_find_type(const char *name)
655 int i;
657 BUILD_BUG_ON(ARRAY_SIZE(rfkill_types) != NUM_RFKILL_TYPES);
659 if (!name)
660 return RFKILL_TYPE_ALL;
662 for (i = 1; i < NUM_RFKILL_TYPES; i++)
663 if (!strcmp(name, rfkill_types[i]))
664 return i;
665 return RFKILL_TYPE_ALL;
667 EXPORT_SYMBOL(rfkill_find_type);
669 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
670 char *buf)
672 struct rfkill *rfkill = to_rfkill(dev);
674 return sprintf(buf, "%s\n", rfkill->name);
676 static DEVICE_ATTR_RO(name);
678 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
679 char *buf)
681 struct rfkill *rfkill = to_rfkill(dev);
683 return sprintf(buf, "%s\n", rfkill_types[rfkill->type]);
685 static DEVICE_ATTR_RO(type);
687 static ssize_t index_show(struct device *dev, struct device_attribute *attr,
688 char *buf)
690 struct rfkill *rfkill = to_rfkill(dev);
692 return sprintf(buf, "%d\n", rfkill->idx);
694 static DEVICE_ATTR_RO(index);
696 static ssize_t persistent_show(struct device *dev,
697 struct device_attribute *attr, char *buf)
699 struct rfkill *rfkill = to_rfkill(dev);
701 return sprintf(buf, "%d\n", rfkill->persistent);
703 static DEVICE_ATTR_RO(persistent);
705 static ssize_t hard_show(struct device *dev, struct device_attribute *attr,
706 char *buf)
708 struct rfkill *rfkill = to_rfkill(dev);
710 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_HW) ? 1 : 0 );
712 static DEVICE_ATTR_RO(hard);
714 static ssize_t soft_show(struct device *dev, struct device_attribute *attr,
715 char *buf)
717 struct rfkill *rfkill = to_rfkill(dev);
719 return sprintf(buf, "%d\n", (rfkill->state & RFKILL_BLOCK_SW) ? 1 : 0 );
722 static ssize_t soft_store(struct device *dev, struct device_attribute *attr,
723 const char *buf, size_t count)
725 struct rfkill *rfkill = to_rfkill(dev);
726 unsigned long state;
727 int err;
729 if (!capable(CAP_NET_ADMIN))
730 return -EPERM;
732 err = kstrtoul(buf, 0, &state);
733 if (err)
734 return err;
736 if (state > 1 )
737 return -EINVAL;
739 mutex_lock(&rfkill_global_mutex);
740 rfkill_set_block(rfkill, state);
741 mutex_unlock(&rfkill_global_mutex);
743 return count;
745 static DEVICE_ATTR_RW(soft);
747 static u8 user_state_from_blocked(unsigned long state)
749 if (state & RFKILL_BLOCK_HW)
750 return RFKILL_USER_STATE_HARD_BLOCKED;
751 if (state & RFKILL_BLOCK_SW)
752 return RFKILL_USER_STATE_SOFT_BLOCKED;
754 return RFKILL_USER_STATE_UNBLOCKED;
757 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
758 char *buf)
760 struct rfkill *rfkill = to_rfkill(dev);
762 return sprintf(buf, "%d\n", user_state_from_blocked(rfkill->state));
765 static ssize_t state_store(struct device *dev, struct device_attribute *attr,
766 const char *buf, size_t count)
768 struct rfkill *rfkill = to_rfkill(dev);
769 unsigned long state;
770 int err;
772 if (!capable(CAP_NET_ADMIN))
773 return -EPERM;
775 err = kstrtoul(buf, 0, &state);
776 if (err)
777 return err;
779 if (state != RFKILL_USER_STATE_SOFT_BLOCKED &&
780 state != RFKILL_USER_STATE_UNBLOCKED)
781 return -EINVAL;
783 mutex_lock(&rfkill_global_mutex);
784 rfkill_set_block(rfkill, state == RFKILL_USER_STATE_SOFT_BLOCKED);
785 mutex_unlock(&rfkill_global_mutex);
787 return count;
789 static DEVICE_ATTR_RW(state);
791 static struct attribute *rfkill_dev_attrs[] = {
792 &dev_attr_name.attr,
793 &dev_attr_type.attr,
794 &dev_attr_index.attr,
795 &dev_attr_persistent.attr,
796 &dev_attr_state.attr,
797 &dev_attr_soft.attr,
798 &dev_attr_hard.attr,
799 NULL,
801 ATTRIBUTE_GROUPS(rfkill_dev);
803 static void rfkill_release(struct device *dev)
805 struct rfkill *rfkill = to_rfkill(dev);
807 kfree(rfkill);
810 static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
812 struct rfkill *rfkill = to_rfkill(dev);
813 unsigned long flags;
814 u32 state;
815 int error;
817 error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
818 if (error)
819 return error;
820 error = add_uevent_var(env, "RFKILL_TYPE=%s",
821 rfkill_types[rfkill->type]);
822 if (error)
823 return error;
824 spin_lock_irqsave(&rfkill->lock, flags);
825 state = rfkill->state;
826 spin_unlock_irqrestore(&rfkill->lock, flags);
827 error = add_uevent_var(env, "RFKILL_STATE=%d",
828 user_state_from_blocked(state));
829 return error;
832 void rfkill_pause_polling(struct rfkill *rfkill)
834 BUG_ON(!rfkill);
836 if (!rfkill->ops->poll)
837 return;
839 rfkill->polling_paused = true;
840 cancel_delayed_work_sync(&rfkill->poll_work);
842 EXPORT_SYMBOL(rfkill_pause_polling);
844 void rfkill_resume_polling(struct rfkill *rfkill)
846 BUG_ON(!rfkill);
848 if (!rfkill->ops->poll)
849 return;
851 rfkill->polling_paused = false;
853 if (rfkill->suspended)
854 return;
856 queue_delayed_work(system_power_efficient_wq,
857 &rfkill->poll_work, 0);
859 EXPORT_SYMBOL(rfkill_resume_polling);
861 #ifdef CONFIG_PM_SLEEP
862 static int rfkill_suspend(struct device *dev)
864 struct rfkill *rfkill = to_rfkill(dev);
866 rfkill->suspended = true;
867 cancel_delayed_work_sync(&rfkill->poll_work);
869 return 0;
872 static int rfkill_resume(struct device *dev)
874 struct rfkill *rfkill = to_rfkill(dev);
875 bool cur;
877 rfkill->suspended = false;
879 if (!rfkill->persistent) {
880 cur = !!(rfkill->state & RFKILL_BLOCK_SW);
881 rfkill_set_block(rfkill, cur);
884 if (rfkill->ops->poll && !rfkill->polling_paused)
885 queue_delayed_work(system_power_efficient_wq,
886 &rfkill->poll_work, 0);
888 return 0;
891 static SIMPLE_DEV_PM_OPS(rfkill_pm_ops, rfkill_suspend, rfkill_resume);
892 #define RFKILL_PM_OPS (&rfkill_pm_ops)
893 #else
894 #define RFKILL_PM_OPS NULL
895 #endif
897 static struct class rfkill_class = {
898 .name = "rfkill",
899 .dev_release = rfkill_release,
900 .dev_groups = rfkill_dev_groups,
901 .dev_uevent = rfkill_dev_uevent,
902 .pm = RFKILL_PM_OPS,
905 bool rfkill_blocked(struct rfkill *rfkill)
907 unsigned long flags;
908 u32 state;
910 spin_lock_irqsave(&rfkill->lock, flags);
911 state = rfkill->state;
912 spin_unlock_irqrestore(&rfkill->lock, flags);
914 return !!(state & RFKILL_BLOCK_ANY);
916 EXPORT_SYMBOL(rfkill_blocked);
919 struct rfkill * __must_check rfkill_alloc(const char *name,
920 struct device *parent,
921 const enum rfkill_type type,
922 const struct rfkill_ops *ops,
923 void *ops_data)
925 struct rfkill *rfkill;
926 struct device *dev;
928 if (WARN_ON(!ops))
929 return NULL;
931 if (WARN_ON(!ops->set_block))
932 return NULL;
934 if (WARN_ON(!name))
935 return NULL;
937 if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
938 return NULL;
940 rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
941 if (!rfkill)
942 return NULL;
944 spin_lock_init(&rfkill->lock);
945 INIT_LIST_HEAD(&rfkill->node);
946 rfkill->type = type;
947 strcpy(rfkill->name, name);
948 rfkill->ops = ops;
949 rfkill->data = ops_data;
951 dev = &rfkill->dev;
952 dev->class = &rfkill_class;
953 dev->parent = parent;
954 device_initialize(dev);
956 return rfkill;
958 EXPORT_SYMBOL(rfkill_alloc);
960 static void rfkill_poll(struct work_struct *work)
962 struct rfkill *rfkill;
964 rfkill = container_of(work, struct rfkill, poll_work.work);
967 * Poll hardware state -- driver will use one of the
968 * rfkill_set{,_hw,_sw}_state functions and use its
969 * return value to update the current status.
971 rfkill->ops->poll(rfkill, rfkill->data);
973 queue_delayed_work(system_power_efficient_wq,
974 &rfkill->poll_work,
975 round_jiffies_relative(POLL_INTERVAL));
978 static void rfkill_uevent_work(struct work_struct *work)
980 struct rfkill *rfkill;
982 rfkill = container_of(work, struct rfkill, uevent_work);
984 mutex_lock(&rfkill_global_mutex);
985 rfkill_event(rfkill);
986 mutex_unlock(&rfkill_global_mutex);
989 static void rfkill_sync_work(struct work_struct *work)
991 struct rfkill *rfkill;
992 bool cur;
994 rfkill = container_of(work, struct rfkill, sync_work);
996 mutex_lock(&rfkill_global_mutex);
997 cur = rfkill_global_states[rfkill->type].cur;
998 rfkill_set_block(rfkill, cur);
999 mutex_unlock(&rfkill_global_mutex);
1002 int __must_check rfkill_register(struct rfkill *rfkill)
1004 static unsigned long rfkill_no;
1005 struct device *dev;
1006 int error;
1008 if (!rfkill)
1009 return -EINVAL;
1011 dev = &rfkill->dev;
1013 mutex_lock(&rfkill_global_mutex);
1015 if (rfkill->registered) {
1016 error = -EALREADY;
1017 goto unlock;
1020 rfkill->idx = rfkill_no;
1021 dev_set_name(dev, "rfkill%lu", rfkill_no);
1022 rfkill_no++;
1024 list_add_tail(&rfkill->node, &rfkill_list);
1026 error = device_add(dev);
1027 if (error)
1028 goto remove;
1030 error = rfkill_led_trigger_register(rfkill);
1031 if (error)
1032 goto devdel;
1034 rfkill->registered = true;
1036 INIT_DELAYED_WORK(&rfkill->poll_work, rfkill_poll);
1037 INIT_WORK(&rfkill->uevent_work, rfkill_uevent_work);
1038 INIT_WORK(&rfkill->sync_work, rfkill_sync_work);
1040 if (rfkill->ops->poll)
1041 queue_delayed_work(system_power_efficient_wq,
1042 &rfkill->poll_work,
1043 round_jiffies_relative(POLL_INTERVAL));
1045 if (!rfkill->persistent || rfkill_epo_lock_active) {
1046 schedule_work(&rfkill->sync_work);
1047 } else {
1048 #ifdef CONFIG_RFKILL_INPUT
1049 bool soft_blocked = !!(rfkill->state & RFKILL_BLOCK_SW);
1051 if (!atomic_read(&rfkill_input_disabled))
1052 __rfkill_switch_all(rfkill->type, soft_blocked);
1053 #endif
1056 rfkill_global_led_trigger_event();
1057 rfkill_send_events(rfkill, RFKILL_OP_ADD);
1059 mutex_unlock(&rfkill_global_mutex);
1060 return 0;
1062 devdel:
1063 device_del(&rfkill->dev);
1064 remove:
1065 list_del_init(&rfkill->node);
1066 unlock:
1067 mutex_unlock(&rfkill_global_mutex);
1068 return error;
1070 EXPORT_SYMBOL(rfkill_register);
1072 void rfkill_unregister(struct rfkill *rfkill)
1074 BUG_ON(!rfkill);
1076 if (rfkill->ops->poll)
1077 cancel_delayed_work_sync(&rfkill->poll_work);
1079 cancel_work_sync(&rfkill->uevent_work);
1080 cancel_work_sync(&rfkill->sync_work);
1082 rfkill->registered = false;
1084 device_del(&rfkill->dev);
1086 mutex_lock(&rfkill_global_mutex);
1087 rfkill_send_events(rfkill, RFKILL_OP_DEL);
1088 list_del_init(&rfkill->node);
1089 rfkill_global_led_trigger_event();
1090 mutex_unlock(&rfkill_global_mutex);
1092 rfkill_led_trigger_unregister(rfkill);
1094 EXPORT_SYMBOL(rfkill_unregister);
1096 void rfkill_destroy(struct rfkill *rfkill)
1098 if (rfkill)
1099 put_device(&rfkill->dev);
1101 EXPORT_SYMBOL(rfkill_destroy);
1103 static int rfkill_fop_open(struct inode *inode, struct file *file)
1105 struct rfkill_data *data;
1106 struct rfkill *rfkill;
1107 struct rfkill_int_event *ev, *tmp;
1109 data = kzalloc(sizeof(*data), GFP_KERNEL);
1110 if (!data)
1111 return -ENOMEM;
1113 INIT_LIST_HEAD(&data->events);
1114 mutex_init(&data->mtx);
1115 init_waitqueue_head(&data->read_wait);
1117 mutex_lock(&rfkill_global_mutex);
1118 mutex_lock(&data->mtx);
1120 * start getting events from elsewhere but hold mtx to get
1121 * startup events added first
1124 list_for_each_entry(rfkill, &rfkill_list, node) {
1125 ev = kzalloc(sizeof(*ev), GFP_KERNEL);
1126 if (!ev)
1127 goto free;
1128 rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
1129 list_add_tail(&ev->list, &data->events);
1131 list_add(&data->list, &rfkill_fds);
1132 mutex_unlock(&data->mtx);
1133 mutex_unlock(&rfkill_global_mutex);
1135 file->private_data = data;
1137 return stream_open(inode, file);
1139 free:
1140 mutex_unlock(&data->mtx);
1141 mutex_unlock(&rfkill_global_mutex);
1142 mutex_destroy(&data->mtx);
1143 list_for_each_entry_safe(ev, tmp, &data->events, list)
1144 kfree(ev);
1145 kfree(data);
1146 return -ENOMEM;
1149 static __poll_t rfkill_fop_poll(struct file *file, poll_table *wait)
1151 struct rfkill_data *data = file->private_data;
1152 __poll_t res = EPOLLOUT | EPOLLWRNORM;
1154 poll_wait(file, &data->read_wait, wait);
1156 mutex_lock(&data->mtx);
1157 if (!list_empty(&data->events))
1158 res = EPOLLIN | EPOLLRDNORM;
1159 mutex_unlock(&data->mtx);
1161 return res;
1164 static ssize_t rfkill_fop_read(struct file *file, char __user *buf,
1165 size_t count, loff_t *pos)
1167 struct rfkill_data *data = file->private_data;
1168 struct rfkill_int_event *ev;
1169 unsigned long sz;
1170 int ret;
1172 mutex_lock(&data->mtx);
1174 while (list_empty(&data->events)) {
1175 if (file->f_flags & O_NONBLOCK) {
1176 ret = -EAGAIN;
1177 goto out;
1179 mutex_unlock(&data->mtx);
1180 /* since we re-check and it just compares pointers,
1181 * using !list_empty() without locking isn't a problem
1183 ret = wait_event_interruptible(data->read_wait,
1184 !list_empty(&data->events));
1185 mutex_lock(&data->mtx);
1187 if (ret)
1188 goto out;
1191 ev = list_first_entry(&data->events, struct rfkill_int_event,
1192 list);
1194 sz = min_t(unsigned long, sizeof(ev->ev), count);
1195 ret = sz;
1196 if (copy_to_user(buf, &ev->ev, sz))
1197 ret = -EFAULT;
1199 list_del(&ev->list);
1200 kfree(ev);
1201 out:
1202 mutex_unlock(&data->mtx);
1203 return ret;
1206 static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
1207 size_t count, loff_t *pos)
1209 struct rfkill *rfkill;
1210 struct rfkill_event ev;
1211 int ret;
1213 /* we don't need the 'hard' variable but accept it */
1214 if (count < RFKILL_EVENT_SIZE_V1 - 1)
1215 return -EINVAL;
1218 * Copy as much data as we can accept into our 'ev' buffer,
1219 * but tell userspace how much we've copied so it can determine
1220 * our API version even in a write() call, if it cares.
1222 count = min(count, sizeof(ev));
1223 if (copy_from_user(&ev, buf, count))
1224 return -EFAULT;
1226 if (ev.type >= NUM_RFKILL_TYPES)
1227 return -EINVAL;
1229 mutex_lock(&rfkill_global_mutex);
1231 switch (ev.op) {
1232 case RFKILL_OP_CHANGE_ALL:
1233 rfkill_update_global_state(ev.type, ev.soft);
1234 list_for_each_entry(rfkill, &rfkill_list, node)
1235 if (rfkill->type == ev.type ||
1236 ev.type == RFKILL_TYPE_ALL)
1237 rfkill_set_block(rfkill, ev.soft);
1238 ret = 0;
1239 break;
1240 case RFKILL_OP_CHANGE:
1241 list_for_each_entry(rfkill, &rfkill_list, node)
1242 if (rfkill->idx == ev.idx &&
1243 (rfkill->type == ev.type ||
1244 ev.type == RFKILL_TYPE_ALL))
1245 rfkill_set_block(rfkill, ev.soft);
1246 ret = 0;
1247 break;
1248 default:
1249 ret = -EINVAL;
1250 break;
1253 mutex_unlock(&rfkill_global_mutex);
1255 return ret ?: count;
1258 static int rfkill_fop_release(struct inode *inode, struct file *file)
1260 struct rfkill_data *data = file->private_data;
1261 struct rfkill_int_event *ev, *tmp;
1263 mutex_lock(&rfkill_global_mutex);
1264 list_del(&data->list);
1265 mutex_unlock(&rfkill_global_mutex);
1267 mutex_destroy(&data->mtx);
1268 list_for_each_entry_safe(ev, tmp, &data->events, list)
1269 kfree(ev);
1271 #ifdef CONFIG_RFKILL_INPUT
1272 if (data->input_handler)
1273 if (atomic_dec_return(&rfkill_input_disabled) == 0)
1274 printk(KERN_DEBUG "rfkill: input handler enabled\n");
1275 #endif
1277 kfree(data);
1279 return 0;
1282 #ifdef CONFIG_RFKILL_INPUT
1283 static long rfkill_fop_ioctl(struct file *file, unsigned int cmd,
1284 unsigned long arg)
1286 struct rfkill_data *data = file->private_data;
1288 if (_IOC_TYPE(cmd) != RFKILL_IOC_MAGIC)
1289 return -ENOSYS;
1291 if (_IOC_NR(cmd) != RFKILL_IOC_NOINPUT)
1292 return -ENOSYS;
1294 mutex_lock(&data->mtx);
1296 if (!data->input_handler) {
1297 if (atomic_inc_return(&rfkill_input_disabled) == 1)
1298 printk(KERN_DEBUG "rfkill: input handler disabled\n");
1299 data->input_handler = true;
1302 mutex_unlock(&data->mtx);
1304 return 0;
1306 #endif
1308 static const struct file_operations rfkill_fops = {
1309 .owner = THIS_MODULE,
1310 .open = rfkill_fop_open,
1311 .read = rfkill_fop_read,
1312 .write = rfkill_fop_write,
1313 .poll = rfkill_fop_poll,
1314 .release = rfkill_fop_release,
1315 #ifdef CONFIG_RFKILL_INPUT
1316 .unlocked_ioctl = rfkill_fop_ioctl,
1317 .compat_ioctl = compat_ptr_ioctl,
1318 #endif
1319 .llseek = no_llseek,
1322 #define RFKILL_NAME "rfkill"
1324 static struct miscdevice rfkill_miscdev = {
1325 .fops = &rfkill_fops,
1326 .name = RFKILL_NAME,
1327 .minor = RFKILL_MINOR,
1330 static int __init rfkill_init(void)
1332 int error;
1334 rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);
1336 error = class_register(&rfkill_class);
1337 if (error)
1338 goto error_class;
1340 error = misc_register(&rfkill_miscdev);
1341 if (error)
1342 goto error_misc;
1344 error = rfkill_global_led_trigger_register();
1345 if (error)
1346 goto error_led_trigger;
1348 #ifdef CONFIG_RFKILL_INPUT
1349 error = rfkill_handler_init();
1350 if (error)
1351 goto error_input;
1352 #endif
1354 return 0;
1356 #ifdef CONFIG_RFKILL_INPUT
1357 error_input:
1358 rfkill_global_led_trigger_unregister();
1359 #endif
1360 error_led_trigger:
1361 misc_deregister(&rfkill_miscdev);
1362 error_misc:
1363 class_unregister(&rfkill_class);
1364 error_class:
1365 return error;
1367 subsys_initcall(rfkill_init);
1369 static void __exit rfkill_exit(void)
1371 #ifdef CONFIG_RFKILL_INPUT
1372 rfkill_handler_exit();
1373 #endif
1374 rfkill_global_led_trigger_unregister();
1375 misc_deregister(&rfkill_miscdev);
1376 class_unregister(&rfkill_class);
1378 module_exit(rfkill_exit);
1380 MODULE_ALIAS_MISCDEV(RFKILL_MINOR);
1381 MODULE_ALIAS("devname:" RFKILL_NAME);