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[media] rc: ir-rc6-decoder: Add encode capability

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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: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Cc: James Hogan <james@albanarts.com>
Cc: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Antti Seppälä 2015-03-31 14:48:09 -03:00 committed by Mauro Carvalho Chehab
parent e9ab364a28
commit 9d974e4933
1 changed files with 117 additions and 0 deletions
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117
drivers/media/rc/ir-rc6-decoder.c
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@ -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)