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[media] rc: ir-rc5-decoder: Add encode capability

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Add the capability to encode RC-5, RC-5X and RC-5-SZ scancodes as raw
events.

The Manchester modulation helper is used, and for RC-5X it is used twice
with two sets of timings, the first with a short trailer space for the
space in the middle, and the second with no leader so that it can
continue the space.

The encoding in RC-5-SZ first inserts a pulse and then simply utilizes
the generic Manchester encoder available in rc-core.

Signed-off-by: James Hogan <james@albanarts.com>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Cc: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
James Hogan 2015-03-31 14:48:08 -03:00 committed by Mauro Carvalho Chehab
parent caec098477
commit e9ab364a28
1 changed files with 97 additions and 0 deletions
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97
drivers/media/rc/ir-rc5-decoder.c
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@ -181,9 +181,106 @@ static int ir_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
return -EINVAL;
}
static const struct ir_raw_timings_manchester ir_rc5_timings = {
.leader = RC5_UNIT,
.pulse_space_start = 0,
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
};
static const struct ir_raw_timings_manchester ir_rc5x_timings[2] = {
{
.leader = RC5_UNIT,
.pulse_space_start = 0,
.clock = RC5_UNIT,
.trailer_space = RC5X_SPACE,
},
{
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
},
};
static const struct ir_raw_timings_manchester ir_rc5_sz_timings = {
.leader = RC5_UNIT,
.pulse_space_start = 0,
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
};
/**
* ir_rc5_encode() - Encode a scancode as a stream of raw events
*
* @protocol: protocol variant 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_rc5_encode(enum rc_type protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max)
{
int ret;
struct ir_raw_event *e = events;
unsigned int data, xdata, command, commandx, system, pre_space_data;
/* Detect protocol and convert scancode to raw data */
if (protocol == RC_TYPE_RC5) {
/* decode scancode */
command = (scancode & 0x003f) >> 0;
commandx = (scancode & 0x0040) >> 6;
system = (scancode & 0x1f00) >> 8;
/* encode data */
data = !commandx << 12 | system << 6 | command;
/* Modulate the data */
ret = ir_raw_gen_manchester(&e, max, &ir_rc5_timings,
RC5_NBITS, data);
if (ret < 0)
return ret;
} else if (protocol == RC_TYPE_RC5X_20) {
/* decode scancode */
xdata = (scancode & 0x00003f) >> 0;
command = (scancode & 0x003f00) >> 8;
commandx = !(scancode & 0x004000);
system = (scancode & 0x1f0000) >> 16;
/* encode data */
data = commandx << 18 | system << 12 | command << 6 | xdata;
/* Modulate the data */
pre_space_data = data >> (RC5X_NBITS - CHECK_RC5X_NBITS);
ret = ir_raw_gen_manchester(&e, max, &ir_rc5x_timings[0],
CHECK_RC5X_NBITS, pre_space_data);
if (ret < 0)
return ret;
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc5x_timings[1],
RC5X_NBITS - CHECK_RC5X_NBITS,
data);
if (ret < 0)
return ret;
} else if (protocol == RC_TYPE_RC5_SZ) {
/* RC5-SZ scancode is raw enough for Manchester as it is */
ret = ir_raw_gen_manchester(&e, max, &ir_rc5_sz_timings,
RC5_SZ_NBITS, scancode & 0x2fff);
if (ret < 0)
return ret;
} else {
return -EINVAL;
}
return e - events;
}
static struct ir_raw_handler rc5_handler = {
.protocols = RC_BIT_RC5 | RC_BIT_RC5X_20 | RC_BIT_RC5_SZ,
.decode = ir_rc5_decode,
.encode = ir_rc5_encode,
};
static int __init ir_rc5_decode_init(void)