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authorAntti Seppälä <a.seppala@gmail.com>2015-03-31 20:48:09 +0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-01-30 18:51:34 +0300
commit9d974e49339dc0ad9a6fbd7438a0887d7a445e29 (patch)
tree8aba49ebb51d0f6ea7571601cf68c80cb02a2e29 /drivers/media/rc
parente9ab364a28c7ada075d6983946c08363df9c8a63 (diff)
downloadlinux-9d974e49339dc0ad9a6fbd7438a0887d7a445e29.tar.xz
[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: 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>
Diffstat (limited to 'drivers/media/rc')
-rw-r--r--drivers/media/rc/ir-rc6-decoder.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/media/rc/ir-rc6-decoder.c b/drivers/media/rc/ir-rc6-decoder.c
index 5cc54c967a80..6fe2268dada0 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)