// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* ImgTec IR Decoder setup for Philips RC-6 protocol.
|
*
|
* Copyright 2012-2014 Imagination Technologies Ltd.
|
*/
|
|
#include "img-ir-hw.h"
|
|
/* Convert RC6 data to a scancode */
|
static int img_ir_rc6_scancode(int len, u64 raw, u64 enabled_protocols,
|
struct img_ir_scancode_req *request)
|
{
|
unsigned int addr, cmd, mode, trl1, trl2;
|
|
/*
|
* Due to a side effect of the decoder handling the double length
|
* Trailer bit, the header information is a bit scrambled, and the
|
* raw data is shifted incorrectly.
|
* This workaround effectively recovers the header bits.
|
*
|
* The Header field should look like this:
|
*
|
* StartBit ModeBit2 ModeBit1 ModeBit0 TrailerBit
|
*
|
* But what we get is:
|
*
|
* ModeBit2 ModeBit1 ModeBit0 TrailerBit1 TrailerBit2
|
*
|
* The start bit is not important to recover the scancode.
|
*/
|
|
raw >>= 27;
|
|
trl1 = (raw >> 17) & 0x01;
|
trl2 = (raw >> 16) & 0x01;
|
|
mode = (raw >> 18) & 0x07;
|
addr = (raw >> 8) & 0xff;
|
cmd = raw & 0xff;
|
|
/*
|
* Due to the above explained irregularity the trailer bits cannot
|
* have the same value.
|
*/
|
if (trl1 == trl2)
|
return -EINVAL;
|
|
/* Only mode 0 supported for now */
|
if (mode)
|
return -EINVAL;
|
|
request->protocol = RC_PROTO_RC6_0;
|
request->scancode = addr << 8 | cmd;
|
request->toggle = trl2;
|
return IMG_IR_SCANCODE;
|
}
|
|
/* Convert RC6 scancode to RC6 data filter */
|
static int img_ir_rc6_filter(const struct rc_scancode_filter *in,
|
struct img_ir_filter *out, u64 protocols)
|
{
|
/* Not supported by the hw. */
|
return -EINVAL;
|
}
|
|
/*
|
* RC-6 decoder
|
* see http://www.sbprojects.com/knowledge/ir/rc6.php
|
*/
|
struct img_ir_decoder img_ir_rc6 = {
|
.type = RC_PROTO_BIT_RC6_0,
|
.control = {
|
.bitorien = 1,
|
.code_type = IMG_IR_CODETYPE_BIPHASE,
|
.decoden = 1,
|
.decodinpol = 1,
|
},
|
/* main timings */
|
.tolerance = 20,
|
/*
|
* Due to a quirk in the img-ir decoder, default header values do
|
* not work, the values described below were extracted from
|
* successful RTL test cases.
|
*/
|
.timings = {
|
/* leader symbol */
|
.ldr = {
|
.pulse = { 650 },
|
.space = { 660 },
|
},
|
/* 0 symbol */
|
.s00 = {
|
.pulse = { 370 },
|
.space = { 370 },
|
},
|
/* 01 symbol */
|
.s01 = {
|
.pulse = { 370 },
|
.space = { 370 },
|
},
|
/* free time */
|
.ft = {
|
.minlen = 21,
|
.maxlen = 21,
|
.ft_min = 2666, /* 2.666 ms */
|
},
|
},
|
|
/* scancode logic */
|
.scancode = img_ir_rc6_scancode,
|
.filter = img_ir_rc6_filter,
|
};
|
