89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
|
|
* ImgTec IR Decoder setup for Philips RC-5 protocol.
|
|
*
|
|
* Copyright 2012-2014 Imagination Technologies Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include "img-ir-hw.h"
|
|
|
|
/* Convert RC5 data to a scancode */
|
|
static int img_ir_rc5_scancode(int len, u64 raw, u64 enabled_protocols,
|
|
struct img_ir_scancode_req *request)
|
|
{
|
|
unsigned int addr, cmd, tgl, start;
|
|
|
|
/* Quirk in the decoder shifts everything by 2 to the left. */
|
|
raw >>= 2;
|
|
|
|
start = (raw >> 13) & 0x01;
|
|
tgl = (raw >> 11) & 0x01;
|
|
addr = (raw >> 6) & 0x1f;
|
|
cmd = raw & 0x3f;
|
|
/*
|
|
* 12th bit is used to extend the command in extended RC5 and has
|
|
* no effect on standard RC5.
|
|
*/
|
|
cmd += ((raw >> 12) & 0x01) ? 0 : 0x40;
|
|
|
|
if (!start)
|
|
return -EINVAL;
|
|
|
|
request->protocol = RC_TYPE_RC5;
|
|
request->scancode = addr << 8 | cmd;
|
|
request->toggle = tgl;
|
|
return IMG_IR_SCANCODE;
|
|
}
|
|
|
|
/* Convert RC5 scancode to RC5 data filter */
|
|
static int img_ir_rc5_filter(const struct rc_scancode_filter *in,
|
|
struct img_ir_filter *out, u64 protocols)
|
|
{
|
|
/* Not supported by the hw. */
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* RC-5 decoder
|
|
* see http://www.sbprojects.com/knowledge/ir/rc5.php
|
|
*/
|
|
struct img_ir_decoder img_ir_rc5 = {
|
|
.type = RC_BIT_RC5,
|
|
.control = {
|
|
.bitoriend2 = 1,
|
|
.code_type = IMG_IR_CODETYPE_BIPHASE,
|
|
.decodend2 = 1,
|
|
},
|
|
/* main timings */
|
|
.tolerance = 16,
|
|
.unit = 888888, /* 1/36k*32=888.888microseconds */
|
|
.timings = {
|
|
/* 10 symbol */
|
|
.s10 = {
|
|
.pulse = { 1 },
|
|
.space = { 1 },
|
|
},
|
|
|
|
/* 11 symbol */
|
|
.s11 = {
|
|
.pulse = { 1 },
|
|
.space = { 1 },
|
|
},
|
|
|
|
/* free time */
|
|
.ft = {
|
|
.minlen = 14,
|
|
.maxlen = 14,
|
|
.ft_min = 5,
|
|
},
|
|
},
|
|
|
|
/* scancode logic */
|
|
.scancode = img_ir_rc5_scancode,
|
|
.filter = img_ir_rc5_filter,
|
|
};
|