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

Add the capability to encode NEC scancodes as raw events. The
scancode_to_raw is pretty much taken from the img-ir NEC filter()
callback, and modulation uses the pulse distance helper added in a
previous commit.

Signed-off-by: James Hogan <james@albanarts.com>
Signed-off-by: Sean Young <sean@mess.org>
Cc: Antti Seppälä <a.seppala@gmail.com>
Cc: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
James Hogan 2014-03-14 20:04:14 -03:00 committed by Mauro Carvalho Chehab
parent 9d974e4933
commit 141cfb1432
1 changed files with 81 additions and 0 deletions
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81
drivers/media/rc/ir-nec-decoder.c
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@ -204,9 +204,90 @@ static int ir_nec_decode(struct rc_dev *dev, struct ir_raw_event ev)
return -EINVAL;
}
/**
* ir_nec_scancode_to_raw() - encode an NEC scancode ready for modulation.
* @protocol: specific protocol to use
* @scancode: a single NEC scancode.
* @raw: raw data to be modulated.
*/
static u32 ir_nec_scancode_to_raw(enum rc_type protocol, u32 scancode)
{
unsigned int addr, addr_inv, data, data_inv;
data = scancode & 0xff;
if (protocol == RC_TYPE_NEC32) {
/* 32-bit NEC (used by Apple and TiVo remotes) */
/* scan encoding: aaAAddDD */
addr_inv = (scancode >> 24) & 0xff;
addr = (scancode >> 16) & 0xff;
data_inv = (scancode >> 8) & 0xff;
} else if (protocol == RC_TYPE_NECX) {
/* Extended NEC */
/* scan encoding AAaaDD */
addr = (scancode >> 16) & 0xff;
addr_inv = (scancode >> 8) & 0xff;
data_inv = data ^ 0xff;
} else {
/* Normal NEC */
/* scan encoding: AADD */
addr = (scancode >> 8) & 0xff;
addr_inv = addr ^ 0xff;
data_inv = data ^ 0xff;
}
/* raw encoding: ddDDaaAA */
return data_inv << 24 |
data << 16 |
addr_inv << 8 |
addr;
}
static const struct ir_raw_timings_pd ir_nec_timings = {
.header_pulse = NEC_HEADER_PULSE,
.header_space = NEC_HEADER_SPACE,
.bit_pulse = NEC_BIT_PULSE,
.bit_space[0] = NEC_BIT_0_SPACE,
.bit_space[1] = NEC_BIT_1_SPACE,
.trailer_pulse = NEC_TRAILER_PULSE,
.trailer_space = NEC_TRAILER_SPACE,
.msb_first = 0,
};
/**
* ir_nec_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_nec_encode(enum rc_type protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max)
{
struct ir_raw_event *e = events;
int ret;
u32 raw;
/* Convert a NEC scancode to raw NEC data */
raw = ir_nec_scancode_to_raw(protocol, scancode);
/* Modulate the raw data using a pulse distance modulation */
ret = ir_raw_gen_pd(&e, max, &ir_nec_timings, NEC_NBITS, raw);
if (ret < 0)
return ret;
return e - events;
}
static struct ir_raw_handler nec_handler = {
.protocols = RC_BIT_NEC | RC_BIT_NECX | RC_BIT_NEC32,
.decode = ir_nec_decode,
.encode = ir_nec_encode,
};
static int __init ir_nec_decode_init(void)