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Commit 103293be authored by Sean Young's avatar Sean Young Committed by Mauro Carvalho Chehab
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[media] rc: ir-sony-decoder: Add encode capability



Add the capability to encode Sony scancodes as raw events. Sony uses
pulse length rather than pulse distance.

Signed-off-by: default avatarSean Young <sean@mess.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent d35afc5f
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+48 −0
Original line number Diff line number Diff line
@@ -169,9 +169,57 @@ static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
	return 0;
}

static const struct ir_raw_timings_pl ir_sony_timings = {
	.header_pulse  = SONY_HEADER_PULSE,
	.bit_space     = SONY_BIT_SPACE,
	.bit_pulse[0]  = SONY_BIT_0_PULSE,
	.bit_pulse[1]  = SONY_BIT_1_PULSE,
	.trailer_space = SONY_TRAILER_SPACE + SONY_BIT_SPACE,
	.msb_first     = 0,
};

/**
 * ir_sony_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.
 */
static int ir_sony_encode(enum rc_type protocol, u32 scancode,
			  struct ir_raw_event *events, unsigned int max)
{
	struct ir_raw_event *e = events;
	u32 raw, len;
	int ret;

	if (protocol == RC_TYPE_SONY12) {
		raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9);
		len = 12;
	} else if (protocol == RC_TYPE_SONY15) {
		raw = (scancode & 0x7f) | ((scancode & 0xff0000) >> 9);
		len = 15;
	} else {
		raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9) |
		       ((scancode & 0xff00) << 4);
		len = 20;
	}

	ret = ir_raw_gen_pl(&e, max, &ir_sony_timings, len, raw);
	if (ret < 0)
		return ret;

	return e - events;
}

static struct ir_raw_handler sony_handler = {
	.protocols	= RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20,
	.decode		= ir_sony_decode,
	.encode		= ir_sony_encode,
};

static int __init ir_sony_decode_init(void)
+20 −0
Original line number Diff line number Diff line
@@ -239,6 +239,26 @@ int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
		  const struct ir_raw_timings_pd *timings,
		  unsigned int n, u64 data);

/**
 * struct ir_raw_timings_pl - pulse-length modulation timings
 * @header_pulse:	duration of header pulse in ns (0 for none)
 * @bit_space:		duration of bit space in ns
 * @bit_pulse:		duration of bit pulse (for logic 0 and 1) in ns
 * @trailer_space:	duration of trailer space in ns
 * @msb_first:		1 if most significant bit is sent first
 */
struct ir_raw_timings_pl {
	unsigned int header_pulse;
	unsigned int bit_space;
	unsigned int bit_pulse[2];
	unsigned int trailer_space;
	unsigned int msb_first:1;
};

int ir_raw_gen_pl(struct ir_raw_event **ev, unsigned int max,
		  const struct ir_raw_timings_pl *timings,
		  unsigned int n, u64 data);

/*
 * Routines from rc-raw.c to be used internally and by decoders
 */
+64 −0
Original line number Diff line number Diff line
@@ -382,6 +382,70 @@ int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
}
EXPORT_SYMBOL(ir_raw_gen_pd);

/**
 * ir_raw_gen_pl() - Encode data to raw events with pulse-length modulation.
 * @ev:		Pointer to pointer to next free event. *@ev is incremented for
 *		each raw event filled.
 * @max:	Maximum number of raw events to fill.
 * @timings:	Pulse distance modulation timings.
 * @n:		Number of bits of data.
 * @data:	Data bits to encode.
 *
 * Encodes the @n least significant bits of @data using space-distance
 * modulation with the timing characteristics described by @timings, writing up
 * to @max raw IR events using the *@ev pointer.
 *
 * Returns:	0 on success.
 *		-ENOBUFS if there isn't enough space in the array to fit the
 *		full encoded data. In this case all @max events will have been
 *		written.
 */
int ir_raw_gen_pl(struct ir_raw_event **ev, unsigned int max,
		  const struct ir_raw_timings_pl *timings,
		  unsigned int n, u64 data)
{
	int i;
	int ret = -ENOBUFS;
	unsigned int pulse;

	if (!max--)
		return ret;

	init_ir_raw_event_duration((*ev)++, 1, timings->header_pulse);

	if (timings->msb_first) {
		for (i = n - 1; i >= 0; --i) {
			if (!max--)
				return ret;
			init_ir_raw_event_duration((*ev)++, 0,
						   timings->bit_space);
			if (!max--)
				return ret;
			pulse = timings->bit_pulse[(data >> i) & 1];
			init_ir_raw_event_duration((*ev)++, 1, pulse);
		}
	} else {
		for (i = 0; i < n; ++i, data >>= 1) {
			if (!max--)
				return ret;
			init_ir_raw_event_duration((*ev)++, 0,
						   timings->bit_space);
			if (!max--)
				return ret;
			pulse = timings->bit_pulse[data & 1];
			init_ir_raw_event_duration((*ev)++, 1, pulse);
		}
	}

	if (!max--)
		return ret;

	init_ir_raw_event_duration((*ev)++, 0, timings->trailer_space);

	return 0;
}
EXPORT_SYMBOL(ir_raw_gen_pl);

/**
 * ir_raw_encode_scancode() - Encode a scancode as raw events
 *