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