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path: root/drivers/media/rc/ir-rc6-decoder.c
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Diffstat (limited to 'drivers/media/rc/ir-rc6-decoder.c')
-rw-r--r--drivers/media/rc/ir-rc6-decoder.c67
1 files changed, 41 insertions, 26 deletions
diff --git a/drivers/media/rc/ir-rc6-decoder.c b/drivers/media/rc/ir-rc6-decoder.c
index 140fb67..4cfdd7f 100644
--- a/drivers/media/rc/ir-rc6-decoder.c
+++ b/drivers/media/rc/ir-rc6-decoder.c
@@ -18,24 +18,31 @@
/*
* This decoder currently supports:
* RC6-0-16 (standard toggle bit in header)
+ * RC6-6A-20 (no toggle bit)
* RC6-6A-24 (no toggle bit)
* RC6-6A-32 (MCE version with toggle bit in body)
*/
-#define RC6_UNIT 444444 /* us */
+#define RC6_UNIT 444444 /* nanosecs */
#define RC6_HEADER_NBITS 4 /* not including toggle bit */
#define RC6_0_NBITS 16
-#define RC6_6A_SMALL_NBITS 24
-#define RC6_6A_LARGE_NBITS 32
+#define RC6_6A_32_NBITS 32
+#define RC6_6A_NBITS 128 /* Variable 8..128 */
#define RC6_PREFIX_PULSE (6 * RC6_UNIT)
#define RC6_PREFIX_SPACE (2 * RC6_UNIT)
#define RC6_BIT_START (1 * RC6_UNIT)
#define RC6_BIT_END (1 * RC6_UNIT)
#define RC6_TOGGLE_START (2 * RC6_UNIT)
#define RC6_TOGGLE_END (2 * RC6_UNIT)
+#define RC6_SUFFIX_SPACE (6 * RC6_UNIT)
#define RC6_MODE_MASK 0x07 /* for the header bits */
#define RC6_STARTBIT_MASK 0x08 /* for the header bits */
#define RC6_6A_MCE_TOGGLE_MASK 0x8000 /* for the body bits */
+#define RC6_6A_LCC_MASK 0xffff0000 /* RC6-6A-32 long customer code mask */
+#define RC6_6A_MCE_CC 0x800f0000 /* MCE customer code */
+#ifndef CHAR_BIT
+#define CHAR_BIT 8 /* Normally in <limits.h> */
+#endif
enum rc6_mode {
RC6_MODE_0,
@@ -125,6 +132,7 @@ again:
break;
data->state = STATE_HEADER_BIT_START;
+ data->header = 0;
return 0;
case STATE_HEADER_BIT_START:
@@ -171,20 +179,14 @@ again:
data->state = STATE_BODY_BIT_START;
decrease_duration(&ev, RC6_TOGGLE_END);
data->count = 0;
+ data->body = 0;
switch (rc6_mode(data)) {
case RC6_MODE_0:
data->wanted_bits = RC6_0_NBITS;
break;
case RC6_MODE_6A:
- /* This might look weird, but we basically
- check the value of the first body bit to
- determine the number of bits in mode 6A */
- if ((!ev.pulse && !geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2)) ||
- geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
- data->wanted_bits = RC6_6A_LARGE_NBITS;
- else
- data->wanted_bits = RC6_6A_SMALL_NBITS;
+ data->wanted_bits = RC6_6A_NBITS;
break;
default:
IR_dprintk(1, "RC6 unknown mode\n");
@@ -193,15 +195,21 @@ again:
goto again;
case STATE_BODY_BIT_START:
- if (!eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2))
- break;
-
- data->body <<= 1;
- if (ev.pulse)
- data->body |= 1;
- data->count++;
- data->state = STATE_BODY_BIT_END;
- return 0;
+ if (eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2)) {
+ /* Discard LSB's that won't fit in data->body */
+ if (data->count++ < CHAR_BIT * sizeof data->body) {
+ data->body <<= 1;
+ if (ev.pulse)
+ data->body |= 1;
+ }
+ data->state = STATE_BODY_BIT_END;
+ return 0;
+ } else if (RC6_MODE_6A == rc6_mode(data) && !ev.pulse &&
+ geq_margin(ev.duration, RC6_SUFFIX_SPACE, RC6_UNIT / 2)) {
+ data->state = STATE_FINISHED;
+ goto again;
+ }
+ break;
case STATE_BODY_BIT_END:
if (!is_transition(&ev, &dev->raw->prev_ev))
@@ -221,20 +229,27 @@ again:
switch (rc6_mode(data)) {
case RC6_MODE_0:
- scancode = data->body & 0xffff;
+ scancode = data->body;
toggle = data->toggle;
IR_dprintk(1, "RC6(0) scancode 0x%04x (toggle: %u)\n",
scancode, toggle);
break;
case RC6_MODE_6A:
- if (data->wanted_bits == RC6_6A_LARGE_NBITS) {
- toggle = data->body & RC6_6A_MCE_TOGGLE_MASK ? 1 : 0;
- scancode = data->body & ~RC6_6A_MCE_TOGGLE_MASK;
+ if (data->count > CHAR_BIT * sizeof data->body) {
+ IR_dprintk(1, "RC6 too many (%u) data bits\n",
+ data->count);
+ goto out;
+ }
+
+ scancode = data->body;
+ if (data->count == RC6_6A_32_NBITS &&
+ (scancode & RC6_6A_LCC_MASK) == RC6_6A_MCE_CC) {
+ /* MCE RC */
+ toggle = (scancode & RC6_6A_MCE_TOGGLE_MASK) ? 1 : 0;
+ scancode &= ~RC6_6A_MCE_TOGGLE_MASK;
} else {
toggle = 0;
- scancode = data->body & 0xffffff;
}
-
IR_dprintk(1, "RC6(6A) scancode 0x%08x (toggle: %u)\n",
scancode, toggle);
break;
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