89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
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/*
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* ImgTec IR Decoder setup for Philips RC-5 protocol.
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*
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* Copyright 2012-2014 Imagination Technologies Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include "img-ir-hw.h"
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/* Convert RC5 data to a scancode */
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static int img_ir_rc5_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, tgl, start;
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/* Quirk in the decoder shifts everything by 2 to the left. */
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raw >>= 2;
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start = (raw >> 13) & 0x01;
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tgl = (raw >> 11) & 0x01;
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addr = (raw >> 6) & 0x1f;
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cmd = raw & 0x3f;
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/*
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* 12th bit is used to extend the command in extended RC5 and has
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* no effect on standard RC5.
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*/
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cmd += ((raw >> 12) & 0x01) ? 0 : 0x40;
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if (!start)
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return -EINVAL;
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request->protocol = RC_PROTO_RC5;
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request->scancode = addr << 8 | cmd;
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request->toggle = tgl;
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return IMG_IR_SCANCODE;
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}
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/* Convert RC5 scancode to RC5 data filter */
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static int img_ir_rc5_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-5 decoder
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* see http://www.sbprojects.com/knowledge/ir/rc5.php
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*/
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struct img_ir_decoder img_ir_rc5 = {
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.type = RC_PROTO_BIT_RC5,
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.control = {
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.bitoriend2 = 1,
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.code_type = IMG_IR_CODETYPE_BIPHASE,
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.decodend2 = 1,
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},
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/* main timings */
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.tolerance = 16,
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.unit = 888888, /* 1/36k*32=888.888microseconds */
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.timings = {
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/* 10 symbol */
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.s10 = {
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.pulse = { 1 },
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.space = { 1 },
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},
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/* 11 symbol */
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.s11 = {
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.pulse = { 1 },
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.space = { 1 },
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},
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/* free time */
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.ft = {
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.minlen = 14,
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.maxlen = 14,
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.ft_min = 5,
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},
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},
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/* scancode logic */
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.scancode = img_ir_rc5_scancode,
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.filter = img_ir_rc5_filter,
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};
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