net/rfkill/input.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Input layer to RF Kill interface connector
  *
  * Copyright (c) 2007 Dmitry Torokhov
  * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
  *
  * If you ever run into a situation in which you have a SW_ type rfkill
  * input device, then you can revive code that was removed in the patch
  * "rfkill-input: remove unused code".
  */

 #include <linux/input.h>
 #include <linux/slab.h>
 #include <linux/moduleparam.h>
 #include <linux/workqueue.h>
 #include <linux/init.h>
 #include <linux/rfkill.h>
 #include <linux/sched.h>

 #include "rfkill.h"

 enum rfkill_input_master_mode {
 	RFKILL_INPUT_MASTER_UNLOCK = 0,
 	RFKILL_INPUT_MASTER_RESTORE = 1,
 	RFKILL_INPUT_MASTER_UNBLOCKALL = 2,
 	NUM_RFKILL_INPUT_MASTER_MODES
 };

 /* Delay (in ms) between consecutive switch ops */
 #define RFKILL_OPS_DELAY 200

 static enum rfkill_input_master_mode rfkill_master_switch_mode =
 					RFKILL_INPUT_MASTER_UNBLOCKALL;
 module_param_named(master_switch_mode, rfkill_master_switch_mode, uint, 0);
 MODULE_PARM_DESC(master_switch_mode,
 	"SW_RFKILL_ALL ON should: 0=do nothing (only unlock); 1=restore; 2=unblock all");

 static spinlock_t rfkill_op_lock;
 static bool rfkill_op_pending;
 static unsigned long rfkill_sw_pending[BITS_TO_LONGS(NUM_RFKILL_TYPES)];
 static unsigned long rfkill_sw_state[BITS_TO_LONGS(NUM_RFKILL_TYPES)];

 enum rfkill_sched_op {
 	RFKILL_GLOBAL_OP_EPO = 0,
 	RFKILL_GLOBAL_OP_RESTORE,
 	RFKILL_GLOBAL_OP_UNLOCK,
 	RFKILL_GLOBAL_OP_UNBLOCK,
 };

 static enum rfkill_sched_op rfkill_master_switch_op;
 static enum rfkill_sched_op rfkill_op;

 static void __rfkill_handle_global_op(enum rfkill_sched_op op)
 {
 	unsigned int i;

 	switch (op) {
 	case RFKILL_GLOBAL_OP_EPO:
 		rfkill_epo();
 		break;
 	case RFKILL_GLOBAL_OP_RESTORE:
 		rfkill_restore_states();
 		break;
 	case RFKILL_GLOBAL_OP_UNLOCK:
 		rfkill_remove_epo_lock();
 		break;
 	case RFKILL_GLOBAL_OP_UNBLOCK:
 		rfkill_remove_epo_lock();
 		for (i = 0; i < NUM_RFKILL_TYPES; i++)
 			rfkill_switch_all(i, false);
 		break;
 	default:
 		/* memory corruption or bug, fail safely */
 		rfkill_epo();
 		WARN(1, "Unknown requested operation %d! "
 			"rfkill Emergency Power Off activated\n",
 			op);
 	}
 }

 static void __rfkill_handle_normal_op(const enum rfkill_type type,
 				      const bool complement)
 {
 	bool blocked;

 	blocked = rfkill_get_global_sw_state(type);
 	if (complement)
 		blocked = !blocked;

 	rfkill_switch_all(type, blocked);
 }

 static void rfkill_op_handler(struct work_struct *work)
 {
 	unsigned int i;
 	bool c;

 	spin_lock_irq(&rfkill_op_lock);
 	do {
 		if (rfkill_op_pending) {
 			enum rfkill_sched_op op = rfkill_op;
 			rfkill_op_pending = false;
 			memset(rfkill_sw_pending, 0,
 				sizeof(rfkill_sw_pending));
 			spin_unlock_irq(&rfkill_op_lock);

 			__rfkill_handle_global_op(op);

 			spin_lock_irq(&rfkill_op_lock);

 			/*
 			 * handle global ops first -- during unlocked period
 			 * we might have gotten a new global op.
 			 */
 			if (rfkill_op_pending)
 				continue;
 		}

 		if (rfkill_is_epo_lock_active())
 			continue;

 		for (i = 0; i < NUM_RFKILL_TYPES; i++) {
 			if (__test_and_clear_bit(i, rfkill_sw_pending)) {
 				c = __test_and_clear_bit(i, rfkill_sw_state);
 				spin_unlock_irq(&rfkill_op_lock);

 				__rfkill_handle_normal_op(i, c);

 				spin_lock_irq(&rfkill_op_lock);
 			}
 		}
 	} while (rfkill_op_pending);
 	spin_unlock_irq(&rfkill_op_lock);
 }

 static DECLARE_DELAYED_WORK(rfkill_op_work, rfkill_op_handler);
 static unsigned long rfkill_last_scheduled;

 static unsigned long rfkill_ratelimit(const unsigned long last)
 {
 	const unsigned long delay = msecs_to_jiffies(RFKILL_OPS_DELAY);
 	return time_after(jiffies, last + delay) ? 0 : delay;
 }

 static void rfkill_schedule_ratelimited(void)
 {
 	if (schedule_delayed_work(&rfkill_op_work,
 				  rfkill_ratelimit(rfkill_last_scheduled)))
 		rfkill_last_scheduled = jiffies;
 }

 static void rfkill_schedule_global_op(enum rfkill_sched_op op)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&rfkill_op_lock, flags);
 	rfkill_op = op;
 	rfkill_op_pending = true;
 	if (op == RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) {
 		/* bypass the limiter for EPO */
 		mod_delayed_work(system_wq, &rfkill_op_work, 0);
 		rfkill_last_scheduled = jiffies;
 	} else
 		rfkill_schedule_ratelimited();
 	spin_unlock_irqrestore(&rfkill_op_lock, flags);
 }

 static void rfkill_schedule_toggle(enum rfkill_type type)
 {
 	unsigned long flags;

 	if (rfkill_is_epo_lock_active())
 		return;

 	spin_lock_irqsave(&rfkill_op_lock, flags);
 	if (!rfkill_op_pending) {
 		__set_bit(type, rfkill_sw_pending);
 		__change_bit(type, rfkill_sw_state);
 		rfkill_schedule_ratelimited();
 	}
 	spin_unlock_irqrestore(&rfkill_op_lock, flags);
 }

 static void rfkill_schedule_evsw_rfkillall(int state)
 {
 	if (state)
 		rfkill_schedule_global_op(rfkill_master_switch_op);
 	else
 		rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
 }

 static void rfkill_event(struct input_handle *handle, unsigned int type,
 			unsigned int code, int data)
 {
 	if (type == EV_KEY && data == 1) {
 		switch (code) {
 		case KEY_WLAN:
 			rfkill_schedule_toggle(RFKILL_TYPE_WLAN);
 			break;
 		case KEY_BLUETOOTH:
 			rfkill_schedule_toggle(RFKILL_TYPE_BLUETOOTH);
 			break;
 		case KEY_UWB:
 			rfkill_schedule_toggle(RFKILL_TYPE_UWB);
 			break;
 		case KEY_WIMAX:
 			rfkill_schedule_toggle(RFKILL_TYPE_WIMAX);
 			break;
 		case KEY_RFKILL:
 			rfkill_schedule_toggle(RFKILL_TYPE_ALL);
 			break;
 		}
 	} else if (type == EV_SW && code == SW_RFKILL_ALL)
 		rfkill_schedule_evsw_rfkillall(data);
 }

 static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
 			  const struct input_device_id *id)
 {
 	struct input_handle *handle;
 	int error;

 	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
 	if (!handle)
 		return -ENOMEM;

 	handle->dev = dev;
 	handle->handler = handler;
 	handle->name = "rfkill";

 	/* causes rfkill_start() to be called */
 	error = input_register_handle(handle);
 	if (error)
 		goto err_free_handle;

 	error = input_open_device(handle);
 	if (error)
 		goto err_unregister_handle;

 	return 0;

  err_unregister_handle:
 	input_unregister_handle(handle);
  err_free_handle:
 	kfree(handle);
 	return error;
 }

 static void rfkill_start(struct input_handle *handle)
 {
 	/*
 	 * Take event_lock to guard against configuration changes, we
 	 * should be able to deal with concurrency with rfkill_event()
 	 * just fine (which event_lock will also avoid).
 	 */
 	spin_lock_irq(&handle->dev->event_lock);

 	if (test_bit(EV_SW, handle->dev->evbit) &&
 	    test_bit(SW_RFKILL_ALL, handle->dev->swbit))
 		rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
 							handle->dev->sw));

 	spin_unlock_irq(&handle->dev->event_lock);
 }

 static void rfkill_disconnect(struct input_handle *handle)
 {
 	input_close_device(handle);
 	input_unregister_handle(handle);
 	kfree(handle);
 }

 static const struct input_device_id rfkill_ids[] = {
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 		.evbit = { BIT_MASK(EV_KEY) },
 		.keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
 	},
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 		.evbit = { BIT_MASK(EV_KEY) },
 		.keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
 	},
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 		.evbit = { BIT_MASK(EV_KEY) },
 		.keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
 	},
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 		.evbit = { BIT_MASK(EV_KEY) },
 		.keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
 	},
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 		.evbit = { BIT_MASK(EV_KEY) },
 		.keybit = { [BIT_WORD(KEY_RFKILL)] = BIT_MASK(KEY_RFKILL) },
 	},
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
 		.evbit = { BIT(EV_SW) },
 		.swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
 	},
 	{ }
 };

 static struct input_handler rfkill_handler = {
 	.name =	"rfkill",
 	.event = rfkill_event,
 	.connect = rfkill_connect,
 	.start = rfkill_start,
 	.disconnect = rfkill_disconnect,
 	.id_table = rfkill_ids,
 };

 int __init rfkill_handler_init(void)
 {
 	switch (rfkill_master_switch_mode) {
 	case RFKILL_INPUT_MASTER_UNBLOCKALL:
 		rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNBLOCK;
 		break;
 	case RFKILL_INPUT_MASTER_RESTORE:
 		rfkill_master_switch_op = RFKILL_GLOBAL_OP_RESTORE;
 		break;
 	case RFKILL_INPUT_MASTER_UNLOCK:
 		rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNLOCK;
 		break;
 	default:
 		return -EINVAL;
 	}

 	spin_lock_init(&rfkill_op_lock);

 	/* Avoid delay at first schedule */
 	rfkill_last_scheduled =
 			jiffies - msecs_to_jiffies(RFKILL_OPS_DELAY) - 1;
 	return input_register_handler(&rfkill_handler);
 }

 void __exit rfkill_handler_exit(void)
 {
 	input_unregister_handler(&rfkill_handler);
 	cancel_delayed_work_sync(&rfkill_op_work);
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Input layer to RF Kill interface connector
	*
	* Copyright (c) 2007 Dmitry Torokhov
	* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
	*
	* If you ever run into a situation in which you have a SW_ type rfkill
	* input device, then you can revive code that was removed in the patch
	* "rfkill-input: remove unused code".
	*/

	#include <linux/input.h>
	#include <linux/slab.h>
	#include <linux/moduleparam.h>
	#include <linux/workqueue.h>
	#include <linux/init.h>
	#include <linux/rfkill.h>
	#include <linux/sched.h>

	#include "rfkill.h"

	enum rfkill_input_master_mode {
	RFKILL_INPUT_MASTER_UNLOCK = 0,
	RFKILL_INPUT_MASTER_RESTORE = 1,
	RFKILL_INPUT_MASTER_UNBLOCKALL = 2,
	NUM_RFKILL_INPUT_MASTER_MODES
	};

	/* Delay (in ms) between consecutive switch ops */
	#define RFKILL_OPS_DELAY 200

	static enum rfkill_input_master_mode rfkill_master_switch_mode =
	RFKILL_INPUT_MASTER_UNBLOCKALL;
	module_param_named(master_switch_mode, rfkill_master_switch_mode, uint, 0);
	MODULE_PARM_DESC(master_switch_mode,
	"SW_RFKILL_ALL ON should: 0=do nothing (only unlock); 1=restore; 2=unblock all");

	static spinlock_t rfkill_op_lock;
	static bool rfkill_op_pending;
	static unsigned long rfkill_sw_pending[BITS_TO_LONGS(NUM_RFKILL_TYPES)];
	static unsigned long rfkill_sw_state[BITS_TO_LONGS(NUM_RFKILL_TYPES)];

	enum rfkill_sched_op {
	RFKILL_GLOBAL_OP_EPO = 0,
	RFKILL_GLOBAL_OP_RESTORE,
	RFKILL_GLOBAL_OP_UNLOCK,
	RFKILL_GLOBAL_OP_UNBLOCK,
	};

	static enum rfkill_sched_op rfkill_master_switch_op;
	static enum rfkill_sched_op rfkill_op;

	static void __rfkill_handle_global_op(enum rfkill_sched_op op)
	{
	unsigned int i;

	switch (op) {
	case RFKILL_GLOBAL_OP_EPO:
	rfkill_epo();
	break;
	case RFKILL_GLOBAL_OP_RESTORE:
	rfkill_restore_states();
	break;
	case RFKILL_GLOBAL_OP_UNLOCK:
	rfkill_remove_epo_lock();
	break;
	case RFKILL_GLOBAL_OP_UNBLOCK:
	rfkill_remove_epo_lock();
	for (i = 0; i < NUM_RFKILL_TYPES; i++)
	rfkill_switch_all(i, false);
	break;
	default:
	/* memory corruption or bug, fail safely */
	rfkill_epo();
	WARN(1, "Unknown requested operation %d! "
	"rfkill Emergency Power Off activated\n",
	op);
	}
	}

	static void __rfkill_handle_normal_op(const enum rfkill_type type,
	const bool complement)
	{
	bool blocked;

	blocked = rfkill_get_global_sw_state(type);
	if (complement)
	blocked = !blocked;

	rfkill_switch_all(type, blocked);
	}

	static void rfkill_op_handler(struct work_struct *work)
	{
	unsigned int i;
	bool c;

	spin_lock_irq(&rfkill_op_lock);
	do {
	if (rfkill_op_pending) {
	enum rfkill_sched_op op = rfkill_op;
	rfkill_op_pending = false;
	memset(rfkill_sw_pending, 0,
	sizeof(rfkill_sw_pending));
	spin_unlock_irq(&rfkill_op_lock);

	__rfkill_handle_global_op(op);

	spin_lock_irq(&rfkill_op_lock);

	/*
	* handle global ops first -- during unlocked period
	* we might have gotten a new global op.
	*/
	if (rfkill_op_pending)
	continue;
	}

	if (rfkill_is_epo_lock_active())
	continue;

	for (i = 0; i < NUM_RFKILL_TYPES; i++) {
	if (__test_and_clear_bit(i, rfkill_sw_pending)) {
	c = __test_and_clear_bit(i, rfkill_sw_state);
	spin_unlock_irq(&rfkill_op_lock);

	__rfkill_handle_normal_op(i, c);

	spin_lock_irq(&rfkill_op_lock);
	}
	}
	} while (rfkill_op_pending);
	spin_unlock_irq(&rfkill_op_lock);
	}

	static DECLARE_DELAYED_WORK(rfkill_op_work, rfkill_op_handler);
	static unsigned long rfkill_last_scheduled;

	static unsigned long rfkill_ratelimit(const unsigned long last)
	{
	const unsigned long delay = msecs_to_jiffies(RFKILL_OPS_DELAY);
	return time_after(jiffies, last + delay) ? 0 : delay;
	}

	static void rfkill_schedule_ratelimited(void)
	{
	if (schedule_delayed_work(&rfkill_op_work,
	rfkill_ratelimit(rfkill_last_scheduled)))
	rfkill_last_scheduled = jiffies;
	}

	static void rfkill_schedule_global_op(enum rfkill_sched_op op)
	{
	unsigned long flags;

	spin_lock_irqsave(&rfkill_op_lock, flags);
	rfkill_op = op;
	rfkill_op_pending = true;
	if (op == RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) {
	/* bypass the limiter for EPO */
	mod_delayed_work(system_wq, &rfkill_op_work, 0);
	rfkill_last_scheduled = jiffies;
	} else
	rfkill_schedule_ratelimited();
	spin_unlock_irqrestore(&rfkill_op_lock, flags);
	}

	static void rfkill_schedule_toggle(enum rfkill_type type)
	{
	unsigned long flags;

	if (rfkill_is_epo_lock_active())
	return;

	spin_lock_irqsave(&rfkill_op_lock, flags);
	if (!rfkill_op_pending) {
	__set_bit(type, rfkill_sw_pending);
	__change_bit(type, rfkill_sw_state);
	rfkill_schedule_ratelimited();
	}
	spin_unlock_irqrestore(&rfkill_op_lock, flags);
	}

	static void rfkill_schedule_evsw_rfkillall(int state)
	{
	if (state)
	rfkill_schedule_global_op(rfkill_master_switch_op);
	else
	rfkill_schedule_global_op(RFKILL_GLOBAL_OP_EPO);
	}

	static void rfkill_event(struct input_handle *handle, unsigned int type,
	unsigned int code, int data)
	{
	if (type == EV_KEY && data == 1) {
	switch (code) {
	case KEY_WLAN:
	rfkill_schedule_toggle(RFKILL_TYPE_WLAN);
	break;
	case KEY_BLUETOOTH:
	rfkill_schedule_toggle(RFKILL_TYPE_BLUETOOTH);
	break;
	case KEY_UWB:
	rfkill_schedule_toggle(RFKILL_TYPE_UWB);
	break;
	case KEY_WIMAX:
	rfkill_schedule_toggle(RFKILL_TYPE_WIMAX);
	break;
	case KEY_RFKILL:
	rfkill_schedule_toggle(RFKILL_TYPE_ALL);
	break;
	}
	} else if (type == EV_SW && code == SW_RFKILL_ALL)
	rfkill_schedule_evsw_rfkillall(data);
	}

	static int rfkill_connect(struct input_handler handler, struct input_dev dev,
	const struct input_device_id *id)
	{
	struct input_handle *handle;
	int error;

	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
	if (!handle)
	return -ENOMEM;

	handle->dev = dev;
	handle->handler = handler;
	handle->name = "rfkill";

	/* causes rfkill_start() to be called */
	error = input_register_handle(handle);
	if (error)
	goto err_free_handle;

	error = input_open_device(handle);
	if (error)
	goto err_unregister_handle;

	return 0;

	err_unregister_handle:
	input_unregister_handle(handle);
	err_free_handle:
	kfree(handle);
	return error;
	}

	static void rfkill_start(struct input_handle *handle)
	{
	/*
	* Take event_lock to guard against configuration changes, we
	* should be able to deal with concurrency with rfkill_event()
	* just fine (which event_lock will also avoid).
	*/
	spin_lock_irq(&handle->dev->event_lock);

	if (test_bit(EV_SW, handle->dev->evbit) &&
	test_bit(SW_RFKILL_ALL, handle->dev->swbit))
	rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
	handle->dev->sw));

	spin_unlock_irq(&handle->dev->event_lock);
	}

	static void rfkill_disconnect(struct input_handle *handle)
	{
	input_close_device(handle);
	input_unregister_handle(handle);
	kfree(handle);
	}

	static const struct input_device_id rfkill_ids[] = {
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	.evbit = { BIT_MASK(EV_KEY) },
	.keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
	},
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	.evbit = { BIT_MASK(EV_KEY) },
	.keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
	},
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	.evbit = { BIT_MASK(EV_KEY) },
	.keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
	},
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	.evbit = { BIT_MASK(EV_KEY) },
	.keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
	},
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	.evbit = { BIT_MASK(EV_KEY) },
	.keybit = { [BIT_WORD(KEY_RFKILL)] = BIT_MASK(KEY_RFKILL) },
	},
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_SWBIT,
	.evbit = { BIT(EV_SW) },
	.swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
	},
	{ }
	};

	static struct input_handler rfkill_handler = {
	.name = "rfkill",
	.event = rfkill_event,
	.connect = rfkill_connect,
	.start = rfkill_start,
	.disconnect = rfkill_disconnect,
	.id_table = rfkill_ids,
	};

	int __init rfkill_handler_init(void)
	{
	switch (rfkill_master_switch_mode) {
	case RFKILL_INPUT_MASTER_UNBLOCKALL:
	rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNBLOCK;
	break;
	case RFKILL_INPUT_MASTER_RESTORE:
	rfkill_master_switch_op = RFKILL_GLOBAL_OP_RESTORE;
	break;
	case RFKILL_INPUT_MASTER_UNLOCK:
	rfkill_master_switch_op = RFKILL_GLOBAL_OP_UNLOCK;
	break;
	default:
	return -EINVAL;
	}

	spin_lock_init(&rfkill_op_lock);

	/* Avoid delay at first schedule */
	rfkill_last_scheduled =
	jiffies - msecs_to_jiffies(RFKILL_OPS_DELAY) - 1;
	return input_register_handler(&rfkill_handler);
	}

	void __exit rfkill_handler_exit(void)
	{
	input_unregister_handler(&rfkill_handler);
	cancel_delayed_work_sync(&rfkill_op_work);
	}