img-ir-rc5.c
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/*
* 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,
};