Add IR encoding helpers, particularly for pulse-distance modulation as
used by the NEC protocol.
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
---
drivers/media/rc/ir-raw.c | 33 +++++++++++++++++++++++++++++++
drivers/media/rc/rc-core-priv.h | 44 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+)
diff --git a/drivers/media/rc/ir-raw.c b/drivers/media/rc/ir-raw.c
index 9aea407..ae7b445 100644
--- a/drivers/media/rc/ir-raw.c
+++ b/drivers/media/rc/ir-raw.c
@@ -240,6 +240,39 @@ ir_raw_get_allowed_protocols(void)
return protocols;
}
+int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
+ const struct ir_raw_timings_pd *timings,
+ unsigned int n, unsigned int data)
+{
+ int i;
+
+ i = 2 + n*2;
+ if (timings->header_pulse)
+ i += 2;
+ if (max < i)
+ return -EINVAL;
+
+ if (timings->header_pulse)
+ ir_raw_gen_pulse_space(ev, timings->header_pulse,
+ timings->header_space);
+
+ if (timings->msb_first) {
+ for (i = n - 1; i >= 0; --i)
+ ir_raw_gen_pulse_space(ev, timings->bit_pulse,
+ timings->bit_space[(data >> i) & 1]);
+ } else {
+ for (i = 0; i < n; ++i, data >>= 1)
+ ir_raw_gen_pulse_space(ev, timings->bit_pulse,
+ timings->bit_space[data & 1]);
+ }
+
+ ir_raw_gen_pulse_space(ev, timings->trailer_pulse,
+ timings->trailer_space);
+
+ return 0;
+}
+EXPORT_SYMBOL(ir_raw_gen_pd);
+
/**
* ir_raw_encode_scancode() - Encode a scancode as raw events
*
diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
index dfbaad0..a77ad96 100644
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -153,6 +153,50 @@ static inline bool is_timing_event(struct ir_raw_event ev)
#define TO_US(duration) DIV_ROUND_CLOSEST((duration), 1000)
#define TO_STR(is_pulse) ((is_pulse) ? "pulse" : "space")
+/* functions for IR encoders */
+
+static inline void init_ir_raw_event_duration(struct ir_raw_event *ev,
+ unsigned int pulse,
+ u32 duration)
+{
+ init_ir_raw_event(ev);
+ ev->duration = duration;
+ ev->pulse = pulse;
+}
+
+static inline void ir_raw_gen_pulse_space(struct ir_raw_event **ev,
+ unsigned int pulse_width,
+ unsigned int space_width)
+{
+ init_ir_raw_event_duration((*ev)++, 1, pulse_width);
+ init_ir_raw_event_duration((*ev)++, 0, space_width);
+}
+
+/**
+ * struct ir_raw_timings_pd - pulse-distance modulation timings
+ * @header_pulse: duration of header pulse in ns (0 for none)
+ * @header_space: duration of header space in ns
+ * @bit_pulse: duration of bit pulse in ns
+ * @bit_space: duration of bit space (for logic 0 and 1) in ns
+ * @trailer_pulse: duration of trailer pulse in ns
+ * @trailer_space: duration of trailer space in ns
+ * @msb_first: 1 if most significant bit is sent first
+ */
+struct ir_raw_timings_pd
+{
+ unsigned int header_pulse;
+ unsigned int header_space;
+ unsigned int bit_pulse;
+ unsigned int bit_space[2];
+ unsigned int trailer_pulse;
+ unsigned int trailer_space;
+ unsigned int msb_first:1;
+};
+
+int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
+ const struct ir_raw_timings_pd *timings,
+ unsigned int n, unsigned int data);
+
/*
* Routines from rc-raw.c to be used internally and by decoders
*/
--
1.8.3.2
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
