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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
113 lines
2.4 KiB
C
113 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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