Add the capability to encode Sony scancodes as raw events. Sony uses
space distance rather than pulse distance.
Signed-off-by: Sean Young <sean@xxxxxxxx>
---
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..a1962ae 100644
--- a/drivers/media/rc/ir-sony-decoder.c
+++ b/drivers/media/rc/ir-sony-decoder.c
@@ -169,9 +169,57 @@ static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev)
return 0;
}
+static struct ir_raw_timings_sd 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_sd(&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 630f33c..bbe2984 100644
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -241,6 +241,26 @@ 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_sd - space-distance 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_sd {
+ 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_sd(struct ir_raw_event **ev, unsigned int max,
+ const struct ir_raw_timings_sd *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 244d93e..6692835 100644
--- a/drivers/media/rc/rc-ir-raw.c
+++ b/drivers/media/rc/rc-ir-raw.c
@@ -394,6 +394,70 @@ int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
EXPORT_SYMBOL(ir_raw_gen_pd);
/**
+ * ir_raw_gen_sd() - Encode data to raw events with space-distance 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_sd(struct ir_raw_event **ev, unsigned int max,
+ const struct ir_raw_timings_sd *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_sd);
+
+/**
* ir_raw_encode_scancode() - Encode a scancode as raw events
*
* @protocol: protocol
--
2.9.3
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