[net-next-2.6.git] / drivers / media / IR / ir-nec-decoder.c

/* ir-nec-decoder.c - handle NEC IR Pulse/Space protocol
 *
 * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 */

#include <media/ir-core.h>

#define NEC_NBITS		32
#define NEC_UNIT		559979 /* ns */
#define NEC_HEADER_MARK		(16 * NEC_UNIT)
#define NEC_HEADER_SPACE	(8 * NEC_UNIT)
#define NEC_REPEAT_SPACE	(4 * NEC_UNIT)
#define NEC_MARK		(NEC_UNIT)
#define NEC_0_SPACE		(NEC_UNIT)
#define NEC_1_SPACE		(3 * NEC_UNIT)

/* Used to register nec_decoder clients */
static LIST_HEAD(decoder_list);
static spinlock_t decoder_lock;

enum nec_state {
	STATE_INACTIVE,
	STATE_HEADER_MARK,
	STATE_HEADER_SPACE,
	STATE_MARK,
	STATE_SPACE,
	STATE_TRAILER_MARK,
	STATE_TRAILER_SPACE,
};

struct nec_code {
	u8	address;
	u8	not_address;
	u8	command;
	u8	not_command;
};

struct decoder_data {
	struct list_head	list;
	struct ir_input_dev	*ir_dev;
	int			enabled:1;

	/* State machine control */
	enum nec_state		state;
	struct nec_code		nec_code;
	unsigned		count;
};


/**
 * get_decoder_data()	- gets decoder data
 * @input_dev:	input device
 *
 * Returns the struct decoder_data that corresponds to a device
 */

static struct decoder_data *get_decoder_data(struct  ir_input_dev *ir_dev)
{
	struct decoder_data *data = NULL;

	spin_lock(&decoder_lock);
	list_for_each_entry(data, &decoder_list, list) {
		if (data->ir_dev == ir_dev)
			break;
	}
	spin_unlock(&decoder_lock);
	return data;
}

static ssize_t store_enabled(struct device *d,
			     struct device_attribute *mattr,
			     const char *buf,
			     size_t len)
{
	unsigned long value;
	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
	struct decoder_data *data = get_decoder_data(ir_dev);

	if (!data)
		return -EINVAL;

	if (strict_strtoul(buf, 10, &value) || value > 1)
		return -EINVAL;

	data->enabled = value;

	return len;
}

static ssize_t show_enabled(struct device *d,
			     struct device_attribute *mattr, char *buf)
{
	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
	struct decoder_data *data = get_decoder_data(ir_dev);

	if (!data)
		return -EINVAL;

	if (data->enabled)
		return sprintf(buf, "1\n");
	else
	return sprintf(buf, "0\n");
}

static DEVICE_ATTR(enabled, S_IRUGO | S_IWUSR, show_enabled, store_enabled);

static struct attribute *decoder_attributes[] = {
	&dev_attr_enabled.attr,
	NULL
};

static struct attribute_group decoder_attribute_group = {
	.name	= "nec_decoder",
	.attrs	= decoder_attributes,
};


/**
 * handle_event() - Decode one NEC pulse or space
 * @input_dev:	the struct input_dev descriptor of the device
 * @ev:		event array with type/duration of pulse/space
 *
 * This function returns -EINVAL if the pulse violates the state machine
 */
static int handle_event(struct input_dev *input_dev,
			struct ir_raw_event *ev)
{
	struct decoder_data *data;
	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	int bit, last_bit;

	data = get_decoder_data(ir_dev);
	if (!data)
		return -EINVAL;

	/* Except for the initial event, what matters is the previous bit */
	bit = (ev->type & IR_PULSE) ? 1 : 0;

	last_bit = !bit;

	/* Discards spurious space last_bits when inactive */

	/* Very long delays are considered as start events */
	if (ev->delta.tv_nsec > NEC_HEADER_MARK + NEC_HEADER_SPACE - NEC_UNIT / 2)
		data->state = STATE_INACTIVE;

	if (ev->type & IR_START_EVENT)
		data->state = STATE_INACTIVE;

	switch (data->state) {
	case STATE_INACTIVE:
		if (!bit)		/* PULSE marks the start event */
			return 0;

		data->count = 0;
		data->state = STATE_HEADER_MARK;
		memset (&data->nec_code, 0, sizeof(data->nec_code));
		return 0;
	case STATE_HEADER_MARK:
		if (!last_bit)
			goto err;
		if (ev->delta.tv_nsec < NEC_HEADER_MARK - 6 * NEC_UNIT)
			goto err;
		data->state = STATE_HEADER_SPACE;
		return 0;
	case STATE_HEADER_SPACE:
		if (last_bit)
			goto err;
		if (ev->delta.tv_nsec >= NEC_HEADER_SPACE - NEC_UNIT / 2) {
			data->state = STATE_MARK;
			return 0;
		}

		if (ev->delta.tv_nsec >= NEC_REPEAT_SPACE - NEC_UNIT / 2) {
			ir_repeat(input_dev);
			IR_dprintk(1, "Repeat last key\n");
			data->state = STATE_TRAILER_MARK;
			return 0;
		}
		goto err;
	case STATE_MARK:
		if (!last_bit)
			goto err;
		if ((ev->delta.tv_nsec > NEC_MARK + NEC_UNIT / 2) ||
		    (ev->delta.tv_nsec < NEC_MARK - NEC_UNIT / 2))
			goto err;
		data->state = STATE_SPACE;
		return 0;
	case STATE_SPACE:
		if (last_bit)
			goto err;

		if ((ev->delta.tv_nsec >= NEC_0_SPACE - NEC_UNIT / 2) &&
		    (ev->delta.tv_nsec < NEC_0_SPACE + NEC_UNIT / 2))
			bit = 0;
		else if ((ev->delta.tv_nsec >= NEC_1_SPACE - NEC_UNIT / 2) &&
		         (ev->delta.tv_nsec < NEC_1_SPACE + NEC_UNIT / 2))
			bit = 1;
		else {
			IR_dprintk(1, "Decode failed at %d-th bit (%s) @%luus\n",
				data->count,
				last_bit ? "pulse" : "space",
				(ev->delta.tv_nsec + 500) / 1000);

			goto err2;
		}

		/* Ok, we've got a valid bit. proccess it */
		if (bit) {
			int shift = data->count;

			/*
			 * NEC transmit bytes on this temporal order:
			 * address | not address | command | not command
			 */
			if (shift < 8) {
				data->nec_code.address |= 1 << shift;
			} else if (shift < 16) {
				data->nec_code.not_address |= 1 << (shift - 8);
			} else if (shift < 24) {
				data->nec_code.command |= 1 << (shift - 16);
			} else {
				data->nec_code.not_command |= 1 << (shift - 24);
			}
		}
		if (++data->count == NEC_NBITS) {
			u32 scancode;
			/*
			 * Fixme: may need to accept Extended NEC protocol?
			 */
			if ((data->nec_code.command ^ data->nec_code.not_command) != 0xff)
				goto checksum_err;

			if ((data->nec_code.address ^ data->nec_code.not_address) != 0xff) {
				/* Extended NEC */
				scancode = data->nec_code.address << 16 |
					   data->nec_code.not_address << 8 |
					   data->nec_code.command;
				IR_dprintk(1, "NEC scancode 0x%06x\n", scancode);
			} else {
				/* normal NEC */
				scancode = data->nec_code.address << 8 |
					   data->nec_code.command;
				IR_dprintk(1, "NEC scancode 0x%04x\n", scancode);
			}
			ir_keydown(input_dev, scancode, 0);

			data->state = STATE_TRAILER_MARK;
		} else
			data->state = STATE_MARK;
		return 0;
	case STATE_TRAILER_MARK:
		if (!last_bit)
			goto err;
		data->state = STATE_TRAILER_SPACE;
		return 0;
	case STATE_TRAILER_SPACE:
		if (last_bit)
			goto err;
		data->state = STATE_INACTIVE;
		return 0;
	}

err:
	IR_dprintk(1, "NEC decoded failed at state %d (%s) @ %luus\n",
		   data->state,
		   bit ? "pulse" : "space",
		   (ev->delta.tv_nsec + 500) / 1000);
err2:
	data->state = STATE_INACTIVE;
	return -EINVAL;

checksum_err:
	data->state = STATE_INACTIVE;
	IR_dprintk(1, "NEC checksum error: received 0x%02x%02x%02x%02x\n",
		   data->nec_code.address,
		   data->nec_code.not_address,
		   data->nec_code.command,
		   data->nec_code.not_command);
	return -EINVAL;
}

/**
 * ir_nec_decode() - Decodes all NEC pulsecodes on a given array
 * @input_dev:	the struct input_dev descriptor of the device
 * @evs:	event array with type/duration of pulse/space
 * @len:	length of the array
 * This function returns the number of decoded pulses
 */
static int ir_nec_decode(struct input_dev *input_dev,
			 struct ir_raw_event *evs,
			 int len)
{
	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	struct decoder_data *data;
	int pos = 0;
	int rc = 0;

	data = get_decoder_data(ir_dev);
	if (!data || !data->enabled)
		return 0;

	for (pos = 0; pos < len; pos++)
		handle_event(input_dev, &evs[pos]);

	return rc;
}

static int ir_nec_register(struct input_dev *input_dev)
{
	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	struct decoder_data *data;
	int rc;

	rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group);
	if (rc < 0)
		return rc;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data) {
		sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
		return -ENOMEM;
	}

	data->ir_dev = ir_dev;
	data->enabled = 1;

	spin_lock(&decoder_lock);
	list_add_tail(&data->list, &decoder_list);
	spin_unlock(&decoder_lock);

	return 0;
}

static int ir_nec_unregister(struct input_dev *input_dev)
{
	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	static struct decoder_data *data;

	data = get_decoder_data(ir_dev);
	if (!data)
		return 0;

	sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);

	spin_lock(&decoder_lock);
	list_del(&data->list);
	spin_unlock(&decoder_lock);

	return 0;
}

static struct ir_raw_handler nec_handler = {
	.decode		= ir_nec_decode,
	.raw_register	= ir_nec_register,
	.raw_unregister	= ir_nec_unregister,
};

static int __init ir_nec_decode_init(void)
{
	ir_raw_handler_register(&nec_handler);

	printk(KERN_INFO "IR NEC protocol handler initialized\n");
	return 0;
}

static void __exit ir_nec_decode_exit(void)
{
	ir_raw_handler_unregister(&nec_handler);
}

module_init(ir_nec_decode_init);
module_exit(ir_nec_decode_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
MODULE_DESCRIPTION("NEC IR protocol decoder");
Commit	Line	Data
995187be	1	/* ir-nec-decoder.c - handle NEC IR Pulse/Space protocol
a3572c34 MCC	2	*
	3	* Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation version 2 of the License.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*/
	14
	15	#include <media/ir-core.h>
	16
67780d6a	17	#define NEC_NBITS 32
2f16f631 MCC	18	#define NEC_UNIT 559979 /* ns */
	19	#define NEC_HEADER_MARK (16 * NEC_UNIT)
	20	#define NEC_HEADER_SPACE (8 * NEC_UNIT)
	21	#define NEC_REPEAT_SPACE (4 * NEC_UNIT)
	22	#define NEC_MARK (NEC_UNIT)
67780d6a MCC	23	#define NEC_0_SPACE (NEC_UNIT)
67780d6a MCC	24	#define NEC_1_SPACE (3 * NEC_UNIT)
9f154782	25
20d5f116 MCC	26	/* Used to register nec_decoder clients */
	27	static LIST_HEAD(decoder_list);
	28	static spinlock_t decoder_lock;
	29
2f16f631 MCC	30	enum nec_state {
	31	STATE_INACTIVE,
	32	STATE_HEADER_MARK,
	33	STATE_HEADER_SPACE,
	34	STATE_MARK,
	35	STATE_SPACE,
	36	STATE_TRAILER_MARK,
	37	STATE_TRAILER_SPACE,
	38	};
	39
	40	struct nec_code {
	41	u8 address;
	42	u8 not_address;
	43	u8 command;
	44	u8 not_command;
	45	};
	46
20d5f116 MCC	47	struct decoder_data {
	48	struct list_head list;
	49	struct ir_input_dev *ir_dev;
	50	int enabled:1;
2f16f631 MCC	51
	52	/* State machine control */
	53	enum nec_state state;
	54	struct nec_code nec_code;
	55	unsigned count;
20d5f116 MCC	56	};
	57
	58
	59	/**
	60	* get_decoder_data() - gets decoder data
	61	* @input_dev: input device
	62	*
	63	* Returns the struct decoder_data that corresponds to a device
	64	*/
	65
	66	static struct decoder_data get_decoder_data(struct ir_input_dev ir_dev)
	67	{
	68	struct decoder_data *data = NULL;
	69
	70	spin_lock(&decoder_lock);
	71	list_for_each_entry(data, &decoder_list, list) {
	72	if (data->ir_dev == ir_dev)
	73	break;
	74	}
	75	spin_unlock(&decoder_lock);
	76	return data;
	77	}
	78
	79	static ssize_t store_enabled(struct device *d,
	80	struct device_attribute *mattr,
	81	const char *buf,
	82	size_t len)
	83	{
	84	unsigned long value;
	85	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
	86	struct decoder_data *data = get_decoder_data(ir_dev);
	87
	88	if (!data)
	89	return -EINVAL;
	90
	91	if (strict_strtoul(buf, 10, &value) \|\| value > 1)
	92	return -EINVAL;
	93
	94	data->enabled = value;
	95
	96	return len;
	97	}
	98
	99	static ssize_t show_enabled(struct device *d,
	100	struct device_attribute mattr, char buf)
	101	{
	102	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
	103	struct decoder_data *data = get_decoder_data(ir_dev);
	104
	105	if (!data)
	106	return -EINVAL;
	107
	108	if (data->enabled)
	109	return sprintf(buf, "1\n");
	110	else
	111	return sprintf(buf, "0\n");
	112	}
	113
	114	static DEVICE_ATTR(enabled, S_IRUGO \| S_IWUSR, show_enabled, store_enabled);
	115
	116	static struct attribute *decoder_attributes[] = {
	117	&dev_attr_enabled.attr,
	118	NULL
	119	};
120
121	static struct attribute_group decoder_attribute_group = {
122	.name = "nec_decoder",
123	.attrs = decoder_attributes,
124	};
125
126
2f16f631 MCC	127	/**
2f16f631 MCC	128	* handle_event() - Decode one NEC pulse or space
9f154782	129	* @input_dev: the struct input_dev descriptor of the device
2f16f631 MCC	130	* @ev: event array with type/duration of pulse/space
	131	*
	132	* This function returns -EINVAL if the pulse violates the state machine
9f154782	133	*/
2f16f631 MCC	134	static int handle_event(struct input_dev *input_dev,
2f16f631 MCC	135	struct ir_raw_event *ev)
9f154782	136	{
2f16f631 MCC	137	struct decoder_data *data;
	138	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	139	int bit, last_bit;
9f154782	140
2f16f631 MCC	141	data = get_decoder_data(ir_dev);
	142	if (!data)
	143	return -EINVAL;
9f154782	144
2f16f631 MCC	145	/* Except for the initial event, what matters is the previous bit */
2f16f631 MCC	146	bit = (ev->type & IR_PULSE) ? 1 : 0;
9f154782	147
2f16f631	148	last_bit = !bit;
a3572c34	149
2f16f631	150	/* Discards spurious space last_bits when inactive */
a3572c34	151
2f16f631 MCC	152	/* Very long delays are considered as start events */
	153	if (ev->delta.tv_nsec > NEC_HEADER_MARK + NEC_HEADER_SPACE - NEC_UNIT / 2)
	154	data->state = STATE_INACTIVE;
a3572c34	155
2f16f631 MCC	156	if (ev->type & IR_START_EVENT)
2f16f631 MCC	157	data->state = STATE_INACTIVE;
9f154782	158
2f16f631 MCC	159	switch (data->state) {
	160	case STATE_INACTIVE:
	161	if (!bit) /* PULSE marks the start event */
	162	return 0;
a3572c34	163
2f16f631 MCC	164	data->count = 0;
	165	data->state = STATE_HEADER_MARK;
	166	memset (&data->nec_code, 0, sizeof(data->nec_code));
	167	return 0;
	168	case STATE_HEADER_MARK:
	169	if (!last_bit)
	170	goto err;
	171	if (ev->delta.tv_nsec < NEC_HEADER_MARK - 6 * NEC_UNIT)
	172	goto err;
	173	data->state = STATE_HEADER_SPACE;
	174	return 0;
	175	case STATE_HEADER_SPACE:
	176	if (last_bit)
	177	goto err;
	178	if (ev->delta.tv_nsec >= NEC_HEADER_SPACE - NEC_UNIT / 2) {
	179	data->state = STATE_MARK;
9f154782 MCC	180	return 0;
9f154782 MCC	181	}
9f154782	182
2f16f631 MCC	183	if (ev->delta.tv_nsec >= NEC_REPEAT_SPACE - NEC_UNIT / 2) {
	184	ir_repeat(input_dev);
	185	IR_dprintk(1, "Repeat last key\n");
	186	data->state = STATE_TRAILER_MARK;
	187	return 0;
	188	}
9f154782	189	goto err;
2f16f631 MCC	190	case STATE_MARK:
	191	if (!last_bit)
	192	goto err;
	193	if ((ev->delta.tv_nsec > NEC_MARK + NEC_UNIT / 2) \|\|
	194	(ev->delta.tv_nsec < NEC_MARK - NEC_UNIT / 2))
	195	goto err;
	196	data->state = STATE_SPACE;
	197	return 0;
	198	case STATE_SPACE:
	199	if (last_bit)
	200	goto err;
a3572c34	201
67780d6a MCC	202	if ((ev->delta.tv_nsec >= NEC_0_SPACE - NEC_UNIT / 2) &&
67780d6a MCC	203	(ev->delta.tv_nsec < NEC_0_SPACE + NEC_UNIT / 2))
a3572c34	204	bit = 0;
67780d6a MCC	205	else if ((ev->delta.tv_nsec >= NEC_1_SPACE - NEC_UNIT / 2) &&
67780d6a MCC	206	(ev->delta.tv_nsec < NEC_1_SPACE + NEC_UNIT / 2))
2f16f631 MCC	207	bit = 1;
	208	else {
	209	IR_dprintk(1, "Decode failed at %d-th bit (%s) @%luus\n",
	210	data->count,
	211	last_bit ? "pulse" : "space",
	212	(ev->delta.tv_nsec + 500) / 1000);
	213
	214	goto err2;
	215	}
a3572c34	216
2f16f631	217	/* Ok, we've got a valid bit. proccess it */
a3572c34	218	if (bit) {
2f16f631 MCC	219	int shift = data->count;
	220
	221	/*
	222	* NEC transmit bytes on this temporal order:
	223	* address \| not address \| command \| not command
	224	*/
a3572c34	225	if (shift < 8) {
2f16f631	226	data->nec_code.address \|= 1 << shift;
a3572c34	227	} else if (shift < 16) {
2f16f631	228	data->nec_code.not_address \|= 1 << (shift - 8);
a3572c34	229	} else if (shift < 24) {
2f16f631	230	data->nec_code.command \|= 1 << (shift - 16);
a3572c34	231	} else {
2f16f631	232	data->nec_code.not_command \|= 1 << (shift - 24);
a3572c34 MCC	233	}
a3572c34 MCC	234	}
67780d6a	235	if (++data->count == NEC_NBITS) {
2f16f631 MCC	236	u32 scancode;
	237	/*
	238	* Fixme: may need to accept Extended NEC protocol?
	239	*/
	240	if ((data->nec_code.command ^ data->nec_code.not_command) != 0xff)
	241	goto checksum_err;
	242
	243	if ((data->nec_code.address ^ data->nec_code.not_address) != 0xff) {
	244	/* Extended NEC */
	245	scancode = data->nec_code.address << 16 \|
	246	data->nec_code.not_address << 8 \|
	247	data->nec_code.command;
	248	IR_dprintk(1, "NEC scancode 0x%06x\n", scancode);
	249	} else {
	250	/* normal NEC */
	251	scancode = data->nec_code.address << 8 \|
	252	data->nec_code.command;
	253	IR_dprintk(1, "NEC scancode 0x%04x\n", scancode);
	254	}
	255	ir_keydown(input_dev, scancode, 0);
a3572c34	256
2f16f631 MCC	257	data->state = STATE_TRAILER_MARK;
	258	} else
	259	data->state = STATE_MARK;
	260	return 0;
	261	case STATE_TRAILER_MARK:
	262	if (!last_bit)
	263	goto err;
	264	data->state = STATE_TRAILER_SPACE;
	265	return 0;
	266	case STATE_TRAILER_SPACE:
	267	if (last_bit)
	268	goto err;
	269	data->state = STATE_INACTIVE;
	270	return 0;
	271	}
a3572c34	272
a3572c34	273	err:
2f16f631 MCC	274	IR_dprintk(1, "NEC decoded failed at state %d (%s) @ %luus\n",
	275	data->state,
	276	bit ? "pulse" : "space",
	277	(ev->delta.tv_nsec + 500) / 1000);
	278	err2:
	279	data->state = STATE_INACTIVE;
	280	return -EINVAL;
a3572c34	281
2f16f631 MCC	282	checksum_err:
	283	data->state = STATE_INACTIVE;
	284	IR_dprintk(1, "NEC checksum error: received 0x%02x%02x%02x%02x\n",
	285	data->nec_code.address,
	286	data->nec_code.not_address,
	287	data->nec_code.command,
	288	data->nec_code.not_command);
a3572c34 MCC	289	return -EINVAL;
a3572c34 MCC	290	}
ada39630 MCC	291
ada39630 MCC	292	/**
2f16f631	293	* ir_nec_decode() - Decodes all NEC pulsecodes on a given array
ada39630 MCC	294	* @input_dev: the struct input_dev descriptor of the device
	295	* @evs: event array with type/duration of pulse/space
	296	* @len: length of the array
93c312ff	297	* This function returns the number of decoded pulses
ada39630	298	*/
995187be MCC	299	static int ir_nec_decode(struct input_dev *input_dev,
	300	struct ir_raw_event *evs,
	301	int len)
ada39630	302	{
20d5f116 MCC	303	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
20d5f116 MCC	304	struct decoder_data *data;
ada39630 MCC	305	int pos = 0;
	306	int rc = 0;
	307
20d5f116 MCC	308	data = get_decoder_data(ir_dev);
	309	if (!data \|\| !data->enabled)
	310	return 0;
	311
2f16f631 MCC	312	for (pos = 0; pos < len; pos++)
	313	handle_event(input_dev, &evs[pos]);
	314
ada39630 MCC	315	return rc;
	316	}
	317
20d5f116 MCC	318	static int ir_nec_register(struct input_dev *input_dev)
	319	{
	320	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	321	struct decoder_data *data;
	322	int rc;
	323
	324	rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group);
	325	if (rc < 0)
	326	return rc;
	327
	328	data = kzalloc(sizeof(*data), GFP_KERNEL);
	329	if (!data) {
	330	sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
	331	return -ENOMEM;
	332	}
	333
	334	data->ir_dev = ir_dev;
	335	data->enabled = 1;
	336
	337	spin_lock(&decoder_lock);
	338	list_add_tail(&data->list, &decoder_list);
	339	spin_unlock(&decoder_lock);
	340
	341	return 0;
	342	}
	343
	344	static int ir_nec_unregister(struct input_dev *input_dev)
	345	{
	346	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	347	static struct decoder_data *data;
	348
	349	data = get_decoder_data(ir_dev);
	350	if (!data)
	351	return 0;
	352
	353	sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
	354
	355	spin_lock(&decoder_lock);
	356	list_del(&data->list);
	357	spin_unlock(&decoder_lock);
	358
	359	return 0;
	360	}
	361
995187be	362	static struct ir_raw_handler nec_handler = {
20d5f116 MCC	363	.decode = ir_nec_decode,
	364	.raw_register = ir_nec_register,
	365	.raw_unregister = ir_nec_unregister,
995187be MCC	366	};
	367
	368	static int __init ir_nec_decode_init(void)
	369	{
	370	ir_raw_handler_register(&nec_handler);
	371
	372	printk(KERN_INFO "IR NEC protocol handler initialized\n");
	373	return 0;
	374	}
	375
	376	static void __exit ir_nec_decode_exit(void)
	377	{
	378	ir_raw_handler_unregister(&nec_handler);
	379	}
	380
	381	module_init(ir_nec_decode_init);
	382	module_exit(ir_nec_decode_exit);
	383
	384	MODULE_LICENSE("GPL");
	385	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
	386	MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
	387	MODULE_DESCRIPTION("NEC IR protocol decoder");