From 103293be9d23de8347fc2e5aecd06f8962d18154 Mon Sep 17 00:00:00 2001 From: Sean Young Date: Tue, 6 Dec 2016 18:33:57 -0200 Subject: [PATCH] [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: Sean Young Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/ir-sony-decoder.c | 48 ++++++++++++++++++++++++++++ drivers/media/rc/rc-core-priv.h | 20 ++++++++++++ drivers/media/rc/rc-ir-raw.c | 64 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 132 insertions(+) diff --git a/drivers/media/rc/ir-sony-decoder.c b/drivers/media/rc/ir-sony-decoder.c index baa972c..355fa81 100644 --- a/drivers/media/rc/ir-sony-decoder.c +++ b/drivers/media/rc/ir-sony-decoder.c @@ -169,9 +169,57 @@ finish_state_machine: 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) diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h index 2471a3c..a70a5c55 100644 --- a/drivers/media/rc/rc-core-priv.h +++ b/drivers/media/rc/rc-core-priv.h @@ -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 */ diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c index 58039e6..4cad5c4 100644 --- a/drivers/media/rc/rc-ir-raw.c +++ b/drivers/media/rc/rc-ir-raw.c @@ -383,6 +383,70 @@ 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 * * @protocol: protocol -- 2.7.4