[deliverable/linux.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 */
};

static void rfkill_task_handler(struct work_struct *work)
{
	struct rfkill_task *task = container_of(work, struct rfkill_task, work);

	mutex_lock(&task->mutex);

	rfkill_switch_all(task->type, task->desired_state);

	mutex_unlock(&task->mutex);
}

static void rfkill_task_epo_handler(struct work_struct *work)
{
	rfkill_epo();
}

static DECLARE_WORK(epo_work, rfkill_task_epo_handler);

static void rfkill_schedule_epo(void)
{
	schedule_work(&epo_work);
}

static void rfkill_schedule_set(struct rfkill_task *task,
				enum rfkill_state desired_state)
{
	unsigned long flags;

	if (unlikely(work_pending(&epo_work)))
		return;

	spin_lock_irqsave(&task->lock, flags);

	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
		task->desired_state = desired_state;
		task->last = jiffies;
		schedule_work(&task->work);
	}

	spin_unlock_irqrestore(&task->lock, flags);
}

static void rfkill_schedule_toggle(struct rfkill_task *task)
{
	unsigned long flags;

	if (unlikely(work_pending(&epo_work)))
		return;

	spin_lock_irqsave(&task->lock, flags);

	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
		task->desired_state =
				rfkill_state_complement(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_UNBLOCKED,	\
	}

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 DEFINE_RFKILL_TASK(rfkill_wimax, RFKILL_TYPE_WIMAX);
static DEFINE_RFKILL_TASK(rfkill_wwan, RFKILL_TYPE_WWAN);

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_wlan);
			break;
		case KEY_BLUETOOTH:
			rfkill_schedule_toggle(&rfkill_bt);
			break;
		case KEY_UWB:
			rfkill_schedule_toggle(&rfkill_uwb);
			break;
		case KEY_WIMAX:
			rfkill_schedule_toggle(&rfkill_wimax);
			break;
		default:
			break;
		}
	} else if (type == EV_SW) {
		switch (code) {
		case SW_RFKILL_ALL:
			/* EVERY radio type. data != 0 means radios ON */
			/* handle EPO (emergency power off) through shortcut */
			if (data) {
				rfkill_schedule_set(&rfkill_wwan,
						    RFKILL_STATE_UNBLOCKED);
				rfkill_schedule_set(&rfkill_wimax,
						    RFKILL_STATE_UNBLOCKED);
				rfkill_schedule_set(&rfkill_uwb,
						    RFKILL_STATE_UNBLOCKED);
				rfkill_schedule_set(&rfkill_bt,
						    RFKILL_STATE_UNBLOCKED);
				rfkill_schedule_set(&rfkill_wlan,
						    RFKILL_STATE_UNBLOCKED);
			} else
				rfkill_schedule_epo();
			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) },
	},
	{
		.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_SWBIT,
		.evbit = { BIT(EV_SW) },
		.swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
	},
	{ }
};

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 */
cf4328cd ID	33	};
	34
	35	static void rfkill_task_handler(struct work_struct *work)
	36	{
	37	struct rfkill_task *task = container_of(work, struct rfkill_task, work);
cf4328cd ID	38
	39	mutex_lock(&task->mutex);
	40
fbc6af2f	41	rfkill_switch_all(task->type, task->desired_state);
cf4328cd ID	42
	43	mutex_unlock(&task->mutex);
	44	}
	45
4081f00d HMH	46	static void rfkill_task_epo_handler(struct work_struct *work)
	47	{
	48	rfkill_epo();
	49	}
	50
	51	static DECLARE_WORK(epo_work, rfkill_task_epo_handler);
	52
	53	static void rfkill_schedule_epo(void)
	54	{
	55	schedule_work(&epo_work);
	56	}
	57
28f089c1 HMH	58	static void rfkill_schedule_set(struct rfkill_task *task,
	59	enum rfkill_state desired_state)
	60	{
	61	unsigned long flags;
	62
4081f00d HMH	63	if (unlikely(work_pending(&epo_work)))
	64	return;
	65
28f089c1 HMH	66	spin_lock_irqsave(&task->lock, flags);
	67
	68	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
	69	task->desired_state = desired_state;
	70	task->last = jiffies;
	71	schedule_work(&task->work);
	72	}
	73
	74	spin_unlock_irqrestore(&task->lock, flags);
	75	}
	76
cf4328cd ID	77	static void rfkill_schedule_toggle(struct rfkill_task *task)
cf4328cd ID	78	{
e6c9116d	79	unsigned long flags;
cf4328cd	80
4081f00d HMH	81	if (unlikely(work_pending(&epo_work)))
	82	return;
	83
cf4328cd ID	84	spin_lock_irqsave(&task->lock, flags);
	85
	86	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
5005657c HMH	87	task->desired_state =
5005657c HMH	88	rfkill_state_complement(task->desired_state);
cf4328cd ID	89	task->last = jiffies;
	90	schedule_work(&task->work);
	91	}
	92
	93	spin_unlock_irqrestore(&task->lock, flags);
	94	}
	95
5005657c HMH	96	#define DEFINE_RFKILL_TASK(n, t) \
	97	struct rfkill_task n = { \
	98	.work = __WORK_INITIALIZER(n.work, \
	99	rfkill_task_handler), \
	100	.type = t, \
	101	.mutex = __MUTEX_INITIALIZER(n.mutex), \
	102	.lock = __SPIN_LOCK_UNLOCKED(n.lock), \
	103	.desired_state = RFKILL_STATE_UNBLOCKED, \
cf4328cd ID	104	}
	105
	106	static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
	107	static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
e0665486	108	static DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);
303d9bf6	109	static DEFINE_RFKILL_TASK(rfkill_wimax, RFKILL_TYPE_WIMAX);
477576a0	110	static DEFINE_RFKILL_TASK(rfkill_wwan, RFKILL_TYPE_WWAN);
cf4328cd ID	111
cf4328cd ID	112	static void rfkill_event(struct input_handle *handle, unsigned int type,
28f089c1	113	unsigned int code, int data)
cf4328cd	114	{
28f089c1	115	if (type == EV_KEY && data == 1) {
cf4328cd ID	116	switch (code) {
	117	case KEY_WLAN:
	118	rfkill_schedule_toggle(&rfkill_wlan);
	119	break;
	120	case KEY_BLUETOOTH:
	121	rfkill_schedule_toggle(&rfkill_bt);
	122	break;
e0665486 ID	123	case KEY_UWB:
	124	rfkill_schedule_toggle(&rfkill_uwb);
	125	break;
303d9bf6 IPG	126	case KEY_WIMAX:
	127	rfkill_schedule_toggle(&rfkill_wimax);
	128	break;
cf4328cd ID	129	default:
	130	break;
	131	}
28f089c1 HMH	132	} else if (type == EV_SW) {
	133	switch (code) {
	134	case SW_RFKILL_ALL:
	135	/* EVERY radio type. data != 0 means radios ON */
4081f00d HMH	136	/* handle EPO (emergency power off) through shortcut */
	137	if (data) {
	138	rfkill_schedule_set(&rfkill_wwan,
5005657c	139	RFKILL_STATE_UNBLOCKED);
4081f00d	140	rfkill_schedule_set(&rfkill_wimax,
5005657c	141	RFKILL_STATE_UNBLOCKED);
4081f00d	142	rfkill_schedule_set(&rfkill_uwb,
5005657c	143	RFKILL_STATE_UNBLOCKED);
4081f00d	144	rfkill_schedule_set(&rfkill_bt,
5005657c	145	RFKILL_STATE_UNBLOCKED);
4081f00d	146	rfkill_schedule_set(&rfkill_wlan,
5005657c	147	RFKILL_STATE_UNBLOCKED);
4081f00d HMH	148	} else
4081f00d HMH	149	rfkill_schedule_epo();
28f089c1 HMH	150	break;
	151	default:
	152	break;
	153	}
cf4328cd ID	154	}
	155	}
	156
	157	static int rfkill_connect(struct input_handler handler, struct input_dev dev,
	158	const struct input_device_id *id)
	159	{
	160	struct input_handle *handle;
	161	int error;
	162
	163	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
	164	if (!handle)
	165	return -ENOMEM;
	166
	167	handle->dev = dev;
	168	handle->handler = handler;
	169	handle->name = "rfkill";
	170
	171	error = input_register_handle(handle);
	172	if (error)
	173	goto err_free_handle;
	174
	175	error = input_open_device(handle);
	176	if (error)
	177	goto err_unregister_handle;
	178
	179	return 0;
	180
	181	err_unregister_handle:
	182	input_unregister_handle(handle);
	183	err_free_handle:
	184	kfree(handle);
	185	return error;
	186	}
	187
	188	static void rfkill_disconnect(struct input_handle *handle)
	189	{
	190	input_close_device(handle);
	191	input_unregister_handle(handle);
	192	kfree(handle);
	193	}
	194
	195	static const struct input_device_id rfkill_ids[] = {
	196	{
	197	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
7b19ada2 JS	198	.evbit = { BIT_MASK(EV_KEY) },
7b19ada2 JS	199	.keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
cf4328cd ID	200	},
	201	{
	202	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
7b19ada2 JS	203	.evbit = { BIT_MASK(EV_KEY) },
7b19ada2 JS	204	.keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
cf4328cd	205	},
e0665486 ID	206	{
e0665486 ID	207	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
7b19ada2 JS	208	.evbit = { BIT_MASK(EV_KEY) },
7b19ada2 JS	209	.keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
e0665486	210	},
303d9bf6 IPG	211	{
	212	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	213	.evbit = { BIT_MASK(EV_KEY) },
	214	.keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
	215	},
28f089c1 HMH	216	{
	217	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_SWBIT,
	218	.evbit = { BIT(EV_SW) },
	219	.swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
	220	},
cf4328cd ID	221	{ }
	222	};
	223
	224	static struct input_handler rfkill_handler = {
	225	.event = rfkill_event,
	226	.connect = rfkill_connect,
	227	.disconnect = rfkill_disconnect,
	228	.name = "rfkill",
	229	.id_table = rfkill_ids,
	230	};
	231
	232	static int __init rfkill_handler_init(void)
	233	{
	234	return input_register_handler(&rfkill_handler);
	235	}
	236
	237	static void __exit rfkill_handler_exit(void)
	238	{
	239	input_unregister_handler(&rfkill_handler);
	240	flush_scheduled_work();
	241	}
	242
	243	module_init(rfkill_handler_init);
	244	module_exit(rfkill_handler_exit);