From 9d974e49339dc0ad9a6fbd7438a0887d7a445e29 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Antti=20Sepp=C3=A4l=C3=A4?= Date: Tue, 31 Mar 2015 14:48:09 -0300 Subject: [PATCH] [media] rc: ir-rc6-decoder: Add encode capability MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Sean Young Cc: James Hogan Cc: David Härdeman Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/ir-rc6-decoder.c | 117 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) diff --git a/drivers/media/rc/ir-rc6-decoder.c b/drivers/media/rc/ir-rc6-decoder.c index 5cc54c9..6fe2268 100644 --- a/drivers/media/rc/ir-rc6-decoder.c +++ b/drivers/media/rc/ir-rc6-decoder.c @@ -286,11 +286,128 @@ out: 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) -- 2.7.4