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84 lines
1.7 KiB
84 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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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#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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