[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_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_SYMBOL		(NEC_UNIT)
#define NEC_1_SYMBOL		(3 * NEC_UNIT)

/* Start time: 4.5 ms + 560 us of the next pulse */
#define MIN_START_TIME	(3900000 + 560000)
#define MAX_START_TIME	(5100000 + 560000)

/* Bit 1 time: 2.25ms us */
#define MIN_BIT1_TIME	2050000
#define MAX_BIT1_TIME	2450000

/* Bit 0 time: 1.12ms us */
#define MIN_BIT0_TIME	920000
#define MAX_BIT0_TIME	1320000

/* Total IR code is 110 ms, including the 9 ms for the start pulse */
#define MAX_NEC_TIME	4000000

/* Total IR code is 110 ms, including the 9 ms for the start pulse */
#define MIN_REPEAT_TIME	99000000
#define MAX_REPEAT_TIME	112000000

/* Repeat time: 2.25ms us */
#define MIN_REPEAT_START_TIME	2050000
#define MAX_REPEAT_START_TIME	3000000

#define REPEAT_TIME	240 /* ms */

/* 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_SYMBOL - NEC_UNIT / 2) &&
		    (ev->delta.tv_nsec < NEC_0_SYMBOL + NEC_UNIT / 2))
			bit = 0;
		else if ((ev->delta.tv_nsec >= NEC_1_SYMBOL - NEC_UNIT / 2) &&
		         (ev->delta.tv_nsec < NEC_1_SYMBOL + 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 == 32) {
			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
2f16f631 MCC	17	#define NEC_UNIT 559979 /* ns */
	18	#define NEC_HEADER_MARK (16 * NEC_UNIT)
	19	#define NEC_HEADER_SPACE (8 * NEC_UNIT)
	20	#define NEC_REPEAT_SPACE (4 * NEC_UNIT)
	21	#define NEC_MARK (NEC_UNIT)
	22	#define NEC_0_SYMBOL (NEC_UNIT)
	23	#define NEC_1_SYMBOL (3 * NEC_UNIT)
	24
9f154782 MCC	25	/* Start time: 4.5 ms + 560 us of the next pulse */
	26	#define MIN_START_TIME (3900000 + 560000)
	27	#define MAX_START_TIME (5100000 + 560000)
a3572c34	28
9f154782 MCC	29	/* Bit 1 time: 2.25ms us */
	30	#define MIN_BIT1_TIME 2050000
	31	#define MAX_BIT1_TIME 2450000
a3572c34	32
9f154782 MCC	33	/* Bit 0 time: 1.12ms us */
	34	#define MIN_BIT0_TIME 920000
	35	#define MAX_BIT0_TIME 1320000
a3572c34	36
9f154782 MCC	37	/* Total IR code is 110 ms, including the 9 ms for the start pulse */
	38	#define MAX_NEC_TIME 4000000
	39
	40	/* Total IR code is 110 ms, including the 9 ms for the start pulse */
	41	#define MIN_REPEAT_TIME 99000000
	42	#define MAX_REPEAT_TIME 112000000
	43
	44	/* Repeat time: 2.25ms us */
	45	#define MIN_REPEAT_START_TIME 2050000
	46	#define MAX_REPEAT_START_TIME 3000000
	47
	48	#define REPEAT_TIME 240 /* ms */
	49
20d5f116 MCC	50	/* Used to register nec_decoder clients */
	51	static LIST_HEAD(decoder_list);
	52	static spinlock_t decoder_lock;
	53
2f16f631 MCC	54	enum nec_state {
	55	STATE_INACTIVE,
	56	STATE_HEADER_MARK,
	57	STATE_HEADER_SPACE,
	58	STATE_MARK,
	59	STATE_SPACE,
	60	STATE_TRAILER_MARK,
	61	STATE_TRAILER_SPACE,
	62	};
	63
	64	struct nec_code {
	65	u8 address;
	66	u8 not_address;
	67	u8 command;
	68	u8 not_command;
	69	};
	70
20d5f116 MCC	71	struct decoder_data {
	72	struct list_head list;
	73	struct ir_input_dev *ir_dev;
	74	int enabled:1;
2f16f631 MCC	75
	76	/* State machine control */
	77	enum nec_state state;
	78	struct nec_code nec_code;
	79	unsigned count;
20d5f116 MCC	80	};
	81
	82
	83	/**
	84	* get_decoder_data() - gets decoder data
	85	* @input_dev: input device
	86	*
	87	* Returns the struct decoder_data that corresponds to a device
	88	*/
	89
	90	static struct decoder_data get_decoder_data(struct ir_input_dev ir_dev)
	91	{
	92	struct decoder_data *data = NULL;
	93
	94	spin_lock(&decoder_lock);
	95	list_for_each_entry(data, &decoder_list, list) {
	96	if (data->ir_dev == ir_dev)
	97	break;
	98	}
	99	spin_unlock(&decoder_lock);
	100	return data;
	101	}
	102
	103	static ssize_t store_enabled(struct device *d,
	104	struct device_attribute *mattr,
	105	const char *buf,
	106	size_t len)
	107	{
	108	unsigned long value;
	109	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
	110	struct decoder_data *data = get_decoder_data(ir_dev);
	111
	112	if (!data)
	113	return -EINVAL;
	114
	115	if (strict_strtoul(buf, 10, &value) \|\| value > 1)
	116	return -EINVAL;
	117
	118	data->enabled = value;
	119
	120	return len;
	121	}
	122
	123	static ssize_t show_enabled(struct device *d,
	124	struct device_attribute mattr, char buf)
	125	{
	126	struct ir_input_dev *ir_dev = dev_get_drvdata(d);
	127	struct decoder_data *data = get_decoder_data(ir_dev);
	128
	129	if (!data)
	130	return -EINVAL;
	131
	132	if (data->enabled)
	133	return sprintf(buf, "1\n");
	134	else
	135	return sprintf(buf, "0\n");
	136	}
	137
	138	static DEVICE_ATTR(enabled, S_IRUGO \| S_IWUSR, show_enabled, store_enabled);
	139
	140	static struct attribute *decoder_attributes[] = {
	141	&dev_attr_enabled.attr,
	142	NULL
	143	};
144
145	static struct attribute_group decoder_attribute_group = {
146	.name = "nec_decoder",
147	.attrs = decoder_attributes,
148	};
149
150
2f16f631 MCC	151	/**
2f16f631 MCC	152	* handle_event() - Decode one NEC pulse or space
9f154782	153	* @input_dev: the struct input_dev descriptor of the device
2f16f631 MCC	154	* @ev: event array with type/duration of pulse/space
	155	*
	156	* This function returns -EINVAL if the pulse violates the state machine
9f154782	157	*/
2f16f631 MCC	158	static int handle_event(struct input_dev *input_dev,
2f16f631 MCC	159	struct ir_raw_event *ev)
9f154782	160	{
2f16f631 MCC	161	struct decoder_data *data;
	162	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	163	int bit, last_bit;
9f154782	164
2f16f631 MCC	165	data = get_decoder_data(ir_dev);
	166	if (!data)
	167	return -EINVAL;
9f154782	168
2f16f631 MCC	169	/* Except for the initial event, what matters is the previous bit */
2f16f631 MCC	170	bit = (ev->type & IR_PULSE) ? 1 : 0;
9f154782	171
2f16f631	172	last_bit = !bit;
a3572c34	173
2f16f631	174	/* Discards spurious space last_bits when inactive */
a3572c34	175
2f16f631 MCC	176	/* Very long delays are considered as start events */
	177	if (ev->delta.tv_nsec > NEC_HEADER_MARK + NEC_HEADER_SPACE - NEC_UNIT / 2)
	178	data->state = STATE_INACTIVE;
a3572c34	179
2f16f631 MCC	180	if (ev->type & IR_START_EVENT)
2f16f631 MCC	181	data->state = STATE_INACTIVE;
9f154782	182
2f16f631 MCC	183	switch (data->state) {
	184	case STATE_INACTIVE:
	185	if (!bit) /* PULSE marks the start event */
	186	return 0;
a3572c34	187
2f16f631 MCC	188	data->count = 0;
	189	data->state = STATE_HEADER_MARK;
	190	memset (&data->nec_code, 0, sizeof(data->nec_code));
	191	return 0;
	192	case STATE_HEADER_MARK:
	193	if (!last_bit)
	194	goto err;
	195	if (ev->delta.tv_nsec < NEC_HEADER_MARK - 6 * NEC_UNIT)
	196	goto err;
	197	data->state = STATE_HEADER_SPACE;
	198	return 0;
	199	case STATE_HEADER_SPACE:
	200	if (last_bit)
	201	goto err;
	202	if (ev->delta.tv_nsec >= NEC_HEADER_SPACE - NEC_UNIT / 2) {
	203	data->state = STATE_MARK;
9f154782 MCC	204	return 0;
9f154782 MCC	205	}
9f154782	206
2f16f631 MCC	207	if (ev->delta.tv_nsec >= NEC_REPEAT_SPACE - NEC_UNIT / 2) {
	208	ir_repeat(input_dev);
	209	IR_dprintk(1, "Repeat last key\n");
	210	data->state = STATE_TRAILER_MARK;
	211	return 0;
	212	}
9f154782	213	goto err;
2f16f631 MCC	214	case STATE_MARK:
	215	if (!last_bit)
	216	goto err;
	217	if ((ev->delta.tv_nsec > NEC_MARK + NEC_UNIT / 2) \|\|
	218	(ev->delta.tv_nsec < NEC_MARK - NEC_UNIT / 2))
	219	goto err;
	220	data->state = STATE_SPACE;
	221	return 0;
	222	case STATE_SPACE:
	223	if (last_bit)
	224	goto err;
a3572c34	225
2f16f631 MCC	226	if ((ev->delta.tv_nsec >= NEC_0_SYMBOL - NEC_UNIT / 2) &&
2f16f631 MCC	227	(ev->delta.tv_nsec < NEC_0_SYMBOL + NEC_UNIT / 2))
a3572c34	228	bit = 0;
2f16f631 MCC	229	else if ((ev->delta.tv_nsec >= NEC_1_SYMBOL - NEC_UNIT / 2) &&
	230	(ev->delta.tv_nsec < NEC_1_SYMBOL + NEC_UNIT / 2))
	231	bit = 1;
	232	else {
	233	IR_dprintk(1, "Decode failed at %d-th bit (%s) @%luus\n",
	234	data->count,
	235	last_bit ? "pulse" : "space",
	236	(ev->delta.tv_nsec + 500) / 1000);
	237
	238	goto err2;
	239	}
a3572c34	240
2f16f631	241	/* Ok, we've got a valid bit. proccess it */
a3572c34	242	if (bit) {
2f16f631 MCC	243	int shift = data->count;
	244
	245	/*
	246	* NEC transmit bytes on this temporal order:
	247	* address \| not address \| command \| not command
	248	*/
a3572c34	249	if (shift < 8) {
2f16f631	250	data->nec_code.address \|= 1 << shift;
a3572c34	251	} else if (shift < 16) {
2f16f631	252	data->nec_code.not_address \|= 1 << (shift - 8);
a3572c34	253	} else if (shift < 24) {
2f16f631	254	data->nec_code.command \|= 1 << (shift - 16);
a3572c34	255	} else {
2f16f631	256	data->nec_code.not_command \|= 1 << (shift - 24);
a3572c34 MCC	257	}
a3572c34 MCC	258	}
2f16f631 MCC	259	if (++data->count == 32) {
	260	u32 scancode;
	261	/*
	262	* Fixme: may need to accept Extended NEC protocol?
	263	*/
	264	if ((data->nec_code.command ^ data->nec_code.not_command) != 0xff)
	265	goto checksum_err;
	266
	267	if ((data->nec_code.address ^ data->nec_code.not_address) != 0xff) {
	268	/* Extended NEC */
	269	scancode = data->nec_code.address << 16 \|
	270	data->nec_code.not_address << 8 \|
	271	data->nec_code.command;
	272	IR_dprintk(1, "NEC scancode 0x%06x\n", scancode);
	273	} else {
	274	/* normal NEC */
	275	scancode = data->nec_code.address << 8 \|
	276	data->nec_code.command;
	277	IR_dprintk(1, "NEC scancode 0x%04x\n", scancode);
	278	}
	279	ir_keydown(input_dev, scancode, 0);
a3572c34	280
2f16f631 MCC	281	data->state = STATE_TRAILER_MARK;
	282	} else
	283	data->state = STATE_MARK;
	284	return 0;
	285	case STATE_TRAILER_MARK:
	286	if (!last_bit)
	287	goto err;
	288	data->state = STATE_TRAILER_SPACE;
	289	return 0;
	290	case STATE_TRAILER_SPACE:
	291	if (last_bit)
	292	goto err;
	293	data->state = STATE_INACTIVE;
	294	return 0;
	295	}
a3572c34	296
a3572c34	297	err:
2f16f631 MCC	298	IR_dprintk(1, "NEC decoded failed at state %d (%s) @ %luus\n",
	299	data->state,
	300	bit ? "pulse" : "space",
	301	(ev->delta.tv_nsec + 500) / 1000);
	302	err2:
	303	data->state = STATE_INACTIVE;
	304	return -EINVAL;
a3572c34	305
2f16f631 MCC	306	checksum_err:
	307	data->state = STATE_INACTIVE;
	308	IR_dprintk(1, "NEC checksum error: received 0x%02x%02x%02x%02x\n",
	309	data->nec_code.address,
	310	data->nec_code.not_address,
	311	data->nec_code.command,
	312	data->nec_code.not_command);
a3572c34 MCC	313	return -EINVAL;
a3572c34 MCC	314	}
ada39630 MCC	315
ada39630 MCC	316	/**
2f16f631	317	* ir_nec_decode() - Decodes all NEC pulsecodes on a given array
ada39630 MCC	318	* @input_dev: the struct input_dev descriptor of the device
	319	* @evs: event array with type/duration of pulse/space
	320	* @len: length of the array
93c312ff	321	* This function returns the number of decoded pulses
ada39630	322	*/
995187be MCC	323	static int ir_nec_decode(struct input_dev *input_dev,
	324	struct ir_raw_event *evs,
	325	int len)
ada39630	326	{
20d5f116 MCC	327	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
20d5f116 MCC	328	struct decoder_data *data;
ada39630 MCC	329	int pos = 0;
	330	int rc = 0;
	331
20d5f116 MCC	332	data = get_decoder_data(ir_dev);
	333	if (!data \|\| !data->enabled)
	334	return 0;
	335
2f16f631 MCC	336	for (pos = 0; pos < len; pos++)
	337	handle_event(input_dev, &evs[pos]);
	338
ada39630 MCC	339	return rc;
	340	}
	341
20d5f116 MCC	342	static int ir_nec_register(struct input_dev *input_dev)
	343	{
	344	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	345	struct decoder_data *data;
	346	int rc;
	347
	348	rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group);
	349	if (rc < 0)
	350	return rc;
	351
	352	data = kzalloc(sizeof(*data), GFP_KERNEL);
	353	if (!data) {
	354	sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
	355	return -ENOMEM;
	356	}
	357
	358	data->ir_dev = ir_dev;
	359	data->enabled = 1;
	360
	361	spin_lock(&decoder_lock);
	362	list_add_tail(&data->list, &decoder_list);
	363	spin_unlock(&decoder_lock);
	364
	365	return 0;
	366	}
	367
	368	static int ir_nec_unregister(struct input_dev *input_dev)
	369	{
	370	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
	371	static struct decoder_data *data;
	372
	373	data = get_decoder_data(ir_dev);
	374	if (!data)
	375	return 0;
	376
	377	sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
	378
	379	spin_lock(&decoder_lock);
	380	list_del(&data->list);
	381	spin_unlock(&decoder_lock);
	382
	383	return 0;
	384	}
	385
995187be	386	static struct ir_raw_handler nec_handler = {
20d5f116 MCC	387	.decode = ir_nec_decode,
	388	.raw_register = ir_nec_register,
	389	.raw_unregister = ir_nec_unregister,
995187be MCC	390	};
	391
	392	static int __init ir_nec_decode_init(void)
	393	{
	394	ir_raw_handler_register(&nec_handler);
	395
	396	printk(KERN_INFO "IR NEC protocol handler initialized\n");
	397	return 0;
	398	}
	399
	400	static void __exit ir_nec_decode_exit(void)
	401	{
	402	ir_raw_handler_unregister(&nec_handler);
	403	}
	404
	405	module_init(ir_nec_decode_init);
	406	module_exit(ir_nec_decode_exit);
	407
	408	MODULE_LICENSE("GPL");
	409	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
	410	MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
	411	MODULE_DESCRIPTION("NEC IR protocol decoder");