[linux-2.6-block.git] / net / rfkill / rfkill-input.c

/*
 * 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>

#include "rfkill-input.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 long 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 DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);

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;
		case KEY_UWB:
			rfkill_schedule_toggle(&rfkill_uwb);
			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_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) },
	},
	{ }
};

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);
Commit	Line	Data
cf4328cd ID	1	/*
	2	* Input layer to RF Kill interface connector
	3	*
	4	* Copyright (c) 2007 Dmitry Torokhov
	5	*/
	6
	7	/*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License version 2 as published
	10	* by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/input.h>
	15	#include <linux/slab.h>
	16	#include <linux/workqueue.h>
	17	#include <linux/init.h>
	18	#include <linux/rfkill.h>
	19
fe242cfd ID	20	#include "rfkill-input.h"
fe242cfd ID	21
cf4328cd ID	22	MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
	23	MODULE_DESCRIPTION("Input layer to RF switch connector");
	24	MODULE_LICENSE("GPL");
	25
	26	struct rfkill_task {
	27	struct work_struct work;
	28	enum rfkill_type type;
	29	struct mutex mutex; /* ensures that task is serialized */
	30	spinlock_t lock; /* for accessing last and desired state */
	31	unsigned long last; /* last schedule */
	32	enum rfkill_state desired_state; /* on/off */
	33	enum rfkill_state current_state; /* on/off */
	34	};
	35
	36	static void rfkill_task_handler(struct work_struct *work)
	37	{
	38	struct rfkill_task *task = container_of(work, struct rfkill_task, work);
	39	enum rfkill_state state;
	40
	41	mutex_lock(&task->mutex);
	42
	43	/*
	44	* Use temp variable to fetch desired state to keep it
	45	* consistent even if rfkill_schedule_toggle() runs in
	46	* another thread or interrupts us.
	47	*/
	48	state = task->desired_state;
	49
	50	if (state != task->current_state) {
	51	rfkill_switch_all(task->type, state);
	52	task->current_state = state;
	53	}
	54
	55	mutex_unlock(&task->mutex);
	56	}
	57
	58	static void rfkill_schedule_toggle(struct rfkill_task *task)
	59	{
e6c9116d	60	unsigned long flags;
cf4328cd ID	61
	62	spin_lock_irqsave(&task->lock, flags);
	63
	64	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
	65	task->desired_state = !task->desired_state;
	66	task->last = jiffies;
	67	schedule_work(&task->work);
	68	}
	69
	70	spin_unlock_irqrestore(&task->lock, flags);
	71	}
	72
	73	#define DEFINE_RFKILL_TASK(n, t) \
	74	struct rfkill_task n = { \
	75	.work = __WORK_INITIALIZER(n.work, \
	76	rfkill_task_handler), \
	77	.type = t, \
	78	.mutex = __MUTEX_INITIALIZER(n.mutex), \
	79	.lock = __SPIN_LOCK_UNLOCKED(n.lock), \
	80	.desired_state = RFKILL_STATE_ON, \
	81	.current_state = RFKILL_STATE_ON, \
	82	}
	83
	84	static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
	85	static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
e0665486	86	static DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);
cf4328cd ID	87
cf4328cd ID	88	static void rfkill_event(struct input_handle *handle, unsigned int type,
2b81bff4	89	unsigned int code, int down)
cf4328cd ID	90	{
	91	if (type == EV_KEY && down == 1) {
	92	switch (code) {
	93	case KEY_WLAN:
	94	rfkill_schedule_toggle(&rfkill_wlan);
	95	break;
	96	case KEY_BLUETOOTH:
	97	rfkill_schedule_toggle(&rfkill_bt);
	98	break;
e0665486 ID	99	case KEY_UWB:
	100	rfkill_schedule_toggle(&rfkill_uwb);
	101	break;
cf4328cd ID	102	default:
	103	break;
	104	}
	105	}
	106	}
	107
	108	static int rfkill_connect(struct input_handler handler, struct input_dev dev,
	109	const struct input_device_id *id)
	110	{
	111	struct input_handle *handle;
	112	int error;
	113
	114	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
	115	if (!handle)
	116	return -ENOMEM;
	117
	118	handle->dev = dev;
	119	handle->handler = handler;
	120	handle->name = "rfkill";
	121
	122	error = input_register_handle(handle);
	123	if (error)
	124	goto err_free_handle;
	125
	126	error = input_open_device(handle);
	127	if (error)
	128	goto err_unregister_handle;
	129
	130	return 0;
	131
	132	err_unregister_handle:
	133	input_unregister_handle(handle);
	134	err_free_handle:
	135	kfree(handle);
	136	return error;
	137	}
	138
	139	static void rfkill_disconnect(struct input_handle *handle)
	140	{
	141	input_close_device(handle);
	142	input_unregister_handle(handle);
	143	kfree(handle);
	144	}
	145
	146	static const struct input_device_id rfkill_ids[] = {
	147	{
	148	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
7b19ada2 JS	149	.evbit = { BIT_MASK(EV_KEY) },
7b19ada2 JS	150	.keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
cf4328cd ID	151	},
	152	{
	153	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
7b19ada2 JS	154	.evbit = { BIT_MASK(EV_KEY) },
7b19ada2 JS	155	.keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
cf4328cd	156	},
e0665486 ID	157	{
e0665486 ID	158	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
7b19ada2 JS	159	.evbit = { BIT_MASK(EV_KEY) },
7b19ada2 JS	160	.keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
e0665486	161	},
cf4328cd ID	162	{ }
	163	};
	164
	165	static struct input_handler rfkill_handler = {
	166	.event = rfkill_event,
	167	.connect = rfkill_connect,
	168	.disconnect = rfkill_disconnect,
	169	.name = "rfkill",
	170	.id_table = rfkill_ids,
	171	};
	172
	173	static int __init rfkill_handler_init(void)
	174	{
	175	return input_register_handler(&rfkill_handler);
	176	}
	177
	178	static void __exit rfkill_handler_exit(void)
	179	{
	180	input_unregister_handler(&rfkill_handler);
	181	flush_scheduled_work();
	182	}
	183
	184	module_init(rfkill_handler_init);
	185	module_exit(rfkill_handler_exit);