Commit 103293be authored by Sean Young's avatar Sean Young Committed by Mauro Carvalho Chehab

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

Add the capability to encode Sony scancodes as raw events. Sony uses
pulse length rather than pulse distance.
Signed-off-by: default avatarSean Young <sean@mess.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent d35afc5f
......@@ -169,9 +169,57 @@ static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
return 0;
}
static const struct ir_raw_timings_pl ir_sony_timings = {
.header_pulse = SONY_HEADER_PULSE,
.bit_space = SONY_BIT_SPACE,
.bit_pulse[0] = SONY_BIT_0_PULSE,
.bit_pulse[1] = SONY_BIT_1_PULSE,
.trailer_space = SONY_TRAILER_SPACE + SONY_BIT_SPACE,
.msb_first = 0,
};
/**
* ir_sony_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_sony_encode(enum rc_type protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max)
{
struct ir_raw_event *e = events;
u32 raw, len;
int ret;
if (protocol == RC_TYPE_SONY12) {
raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9);
len = 12;
} else if (protocol == RC_TYPE_SONY15) {
raw = (scancode & 0x7f) | ((scancode & 0xff0000) >> 9);
len = 15;
} else {
raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9) |
((scancode & 0xff00) << 4);
len = 20;
}
ret = ir_raw_gen_pl(&e, max, &ir_sony_timings, len, raw);
if (ret < 0)
return ret;
return e - events;
}
static struct ir_raw_handler sony_handler = {
.protocols = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20,
.decode = ir_sony_decode,
.encode = ir_sony_encode,
};
static int __init ir_sony_decode_init(void)
......
......@@ -239,6 +239,26 @@ int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
const struct ir_raw_timings_pd *timings,
unsigned int n, u64 data);
/**
* struct ir_raw_timings_pl - pulse-length modulation timings
* @header_pulse: duration of header pulse in ns (0 for none)
* @bit_space: duration of bit space in ns
* @bit_pulse: duration of bit pulse (for logic 0 and 1) in ns
* @trailer_space: duration of trailer space in ns
* @msb_first: 1 if most significant bit is sent first
*/
struct ir_raw_timings_pl {
unsigned int header_pulse;
unsigned int bit_space;
unsigned int bit_pulse[2];
unsigned int trailer_space;
unsigned int msb_first:1;
};
int ir_raw_gen_pl(struct ir_raw_event **ev, unsigned int max,
const struct ir_raw_timings_pl *timings,
unsigned int n, u64 data);
/*
* Routines from rc-raw.c to be used internally and by decoders
*/
......
......@@ -382,6 +382,70 @@ int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
}
EXPORT_SYMBOL(ir_raw_gen_pd);
/**
* ir_raw_gen_pl() - Encode data to raw events with pulse-length modulation.
* @ev: Pointer to pointer to next free event. *@ev is incremented for
* each raw event filled.
* @max: Maximum number of raw events to fill.
* @timings: Pulse distance modulation timings.
* @n: Number of bits of data.
* @data: Data bits to encode.
*
* Encodes the @n least significant bits of @data using space-distance
* modulation with the timing characteristics described by @timings, writing up
* to @max raw IR events using the *@ev pointer.
*
* Returns: 0 on success.
* -ENOBUFS if there isn't enough space in the array to fit the
* full encoded data. In this case all @max events will have been
* written.
*/
int ir_raw_gen_pl(struct ir_raw_event **ev, unsigned int max,
const struct ir_raw_timings_pl *timings,
unsigned int n, u64 data)
{
int i;
int ret = -ENOBUFS;
unsigned int pulse;
if (!max--)
return ret;
init_ir_raw_event_duration((*ev)++, 1, timings->header_pulse);
if (timings->msb_first) {
for (i = n - 1; i >= 0; --i) {
if (!max--)
return ret;
init_ir_raw_event_duration((*ev)++, 0,
timings->bit_space);
if (!max--)
return ret;
pulse = timings->bit_pulse[(data >> i) & 1];
init_ir_raw_event_duration((*ev)++, 1, pulse);
}
} else {
for (i = 0; i < n; ++i, data >>= 1) {
if (!max--)
return ret;
init_ir_raw_event_duration((*ev)++, 0,
timings->bit_space);
if (!max--)
return ret;
pulse = timings->bit_pulse[data & 1];
init_ir_raw_event_duration((*ev)++, 1, pulse);
}
}
if (!max--)
return ret;
init_ir_raw_event_duration((*ev)++, 0, timings->trailer_space);
return 0;
}
EXPORT_SYMBOL(ir_raw_gen_pl);
/**
* ir_raw_encode_scancode() - Encode a scancode as raw events
*
......
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