[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 <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/rc/ir-sony-decoder.c b/drivers/media/rc/ir-sony-decoder.c
index baa972c..355fa81 100644 (file)
--- 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..a70a5c5 100644 (file)
--- 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 (file)
--- 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