diff options
Diffstat (limited to 'drivers/media/rc/ir-rc6-decoder.c')
| -rw-r--r-- | drivers/media/rc/ir-rc6-decoder.c | 67 |
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 140fb67e2f89..4cfdd7fa4bbd 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; |