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Commit 9d974e49 authored by Antti Seppälä's avatar Antti Seppälä Committed by Mauro Carvalho Chehab
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[media] rc: ir-rc6-decoder: Add encode capability 



Add the capability to encode RC-6 and RC-6A scancodes as raw events.

The Manchester modulation helper is used several times with various
timings so that RC-6 header preamble, the header, header trailing bit
and the data itself can be modulated correctly.

Signed-off-by: default avatarAntti Seppälä <a.seppala@gmail.com>
Signed-off-by: default avatarSean Young <sean@mess.org>
Cc: James Hogan <james@albanarts.com>
Cc: David Härdeman <david@hardeman.nu>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent e9ab364a

drivers/media/rc/ir-rc6-decoder.c

+117 −0
Original line number Diff line number Diff line
@@ -286,11 +286,128 @@ static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev) 
	return -EINVAL;

}



static const struct ir_raw_timings_manchester ir_rc6_timings[4] = {

	{

		.leader			= RC6_PREFIX_PULSE,

		.pulse_space_start	= 0,

		.clock			= RC6_UNIT,

		.invert			= 1,

		.trailer_space		= RC6_PREFIX_SPACE,

	},

	{

		.clock			= RC6_UNIT,

		.invert			= 1,

	},

	{

		.clock			= RC6_UNIT * 2,

		.invert			= 1,

	},

	{

		.clock			= RC6_UNIT,

		.invert			= 1,

		.trailer_space		= RC6_SUFFIX_SPACE,

	},

};



/**

 * ir_rc6_encode() - Encode a scancode as a stream of raw events

 *

 * @protocol:	protocol to encode

 * @scancode:	scancode to encode

 * @events:	array of raw ir events to write into

 * @max:	maximum size of @events

 *

 * Returns:	The number of events written.

 *		-ENOBUFS if there isn't enough space in the array to fit the

 *		encoding. In this case all @max events will have been written.

 *		-EINVAL if the scancode is ambiguous or invalid.

 */

static int ir_rc6_encode(enum rc_type protocol, u32 scancode,

			 struct ir_raw_event *events, unsigned int max)

{

	int ret;

	struct ir_raw_event *e = events;



	if (protocol == RC_TYPE_RC6_0) {

		/* Modulate the preamble */

		ret = ir_raw_gen_manchester(&e, max, &ir_rc6_timings[0], 0, 0);

		if (ret < 0)

			return ret;



		/* Modulate the header (Start Bit & Mode-0) */

		ret = ir_raw_gen_manchester(&e, max - (e - events),

					    &ir_rc6_timings[1],

					    RC6_HEADER_NBITS, (1 << 3));

		if (ret < 0)

			return ret;



		/* Modulate Trailer Bit */

		ret = ir_raw_gen_manchester(&e, max - (e - events),

					    &ir_rc6_timings[2], 1, 0);

		if (ret < 0)

			return ret;



		/* Modulate rest of the data */

		ret = ir_raw_gen_manchester(&e, max - (e - events),

					    &ir_rc6_timings[3], RC6_0_NBITS,

					    scancode);

		if (ret < 0)

			return ret;



	} else {

		int bits;



		switch (protocol) {

		case RC_TYPE_RC6_MCE:

		case RC_TYPE_RC6_6A_32:

			bits = 32;

			break;

		case RC_TYPE_RC6_6A_24:

			bits = 24;

			break;

		case RC_TYPE_RC6_6A_20:

			bits = 20;

			break;

		default:

			return -EINVAL;

		}



		/* Modulate the preamble */

		ret = ir_raw_gen_manchester(&e, max, &ir_rc6_timings[0], 0, 0);

		if (ret < 0)

			return ret;



		/* Modulate the header (Start Bit & Header-version 6 */

		ret = ir_raw_gen_manchester(&e, max - (e - events),

					    &ir_rc6_timings[1],

					    RC6_HEADER_NBITS, (1 << 3 | 6));

		if (ret < 0)

			return ret;



		/* Modulate Trailer Bit */

		ret = ir_raw_gen_manchester(&e, max - (e - events),

					    &ir_rc6_timings[2], 1, 0);

		if (ret < 0)

			return ret;



		/* Modulate rest of the data */

		ret = ir_raw_gen_manchester(&e, max - (e - events),

					    &ir_rc6_timings[3],

					    bits,

					    scancode);

		if (ret < 0)

			return ret;

	}



	return e - events;

}



static struct ir_raw_handler rc6_handler = {

	.protocols	= RC_BIT_RC6_0 | RC_BIT_RC6_6A_20 |

			  RC_BIT_RC6_6A_24 | RC_BIT_RC6_6A_32 |

			  RC_BIT_RC6_MCE,

	.decode		= ir_rc6_decode,

	.encode		= ir_rc6_encode,

};



static int __init ir_rc6_decode_init(void)