/* * Input layer to RF Kill interface connector * * Copyright (c) 2007 Dmitry Torokhov */ /* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ #include <linux/module.h>#include <linux/input.h>#include <linux/slab.h>#include <linux/workqueue.h>#include <linux/init.h>#include <linux/rfkill.h> MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");MODULE_DESCRIPTION("Input layer to RF switch connector");MODULE_LICENSE("GPL"); struct rfkill_task {	struct work_struct work;	enum rfkill_type type;	struct mutex mutex; /* ensures that task is serialized */	spinlock_t lock; /* for accessing last and desired state */	unsigned long last; /* last schedule */	enum rfkill_state desired_state; /* on/off */	enum rfkill_state current_state; /* on/off */}; static void rfkill_task_handler(struct work_struct *work){	struct rfkill_task *task = container_of(work, struct rfkill_task, work);	enum rfkill_state state; 	mutex_lock(&task->mutex); 	/*	 * Use temp variable to fetch desired state to keep it	 * consistent even if rfkill_schedule_toggle() runs in	 * another thread or interrupts us.	 */	state = task->desired_state; 	if (state != task->current_state) {		rfkill_switch_all(task->type, state);		task->current_state = state;	} 	mutex_unlock(&task->mutex);} static void rfkill_schedule_toggle(struct rfkill_task *task){	unsigned int flags; 	spin_lock_irqsave(&task->lock, flags); 	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {		task->desired_state = !task->desired_state;		task->last = jiffies;		schedule_work(&task->work);	} 	spin_unlock_irqrestore(&task->lock, flags);} #define DEFINE_RFKILL_TASK(n, t)			\	struct rfkill_task n = {			\		.work = __WORK_INITIALIZER(n.work,	\				rfkill_task_handler),	\		.type = t,				\		.mutex = __MUTEX_INITIALIZER(n.mutex),	\		.lock = __SPIN_LOCK_UNLOCKED(n.lock),	\		.desired_state = RFKILL_STATE_ON,	\		.current_state = RFKILL_STATE_ON,	\	} static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH); static void rfkill_event(struct input_handle *handle, unsigned int type,		        unsigned int code, int down){	if (type == EV_KEY && down == 1) {		switch (code) {		case KEY_WLAN:			rfkill_schedule_toggle(&rfkill_wlan);			break;		case KEY_BLUETOOTH:			rfkill_schedule_toggle(&rfkill_bt);			break;		default:			break;		}	}} 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"; 	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_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(EV_KEY) },		.keybit = { [LONG(KEY_WLAN)] = BIT(KEY_WLAN) },	},	{		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,		.evbit = { BIT(EV_KEY) },		.keybit = { [LONG(KEY_BLUETOOTH)] = BIT(KEY_BLUETOOTH) },	},	{ }}; static struct input_handler rfkill_handler = {	.event =	rfkill_event,	.connect =	rfkill_connect,	.disconnect =	rfkill_disconnect,	.name =		"rfkill",	.id_table =	rfkill_ids,}; static int __init rfkill_handler_init(void){	return input_register_handler(&rfkill_handler);} static void __exit rfkill_handler_exit(void){	input_unregister_handler(&rfkill_handler);	flush_scheduled_work();} module_init(rfkill_handler_init);module_exit(rfkill_handler_exit);