cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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img-ir-rc5.c (1759B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * ImgTec IR Decoder setup for Philips RC-5 protocol.
      4 *
      5 * Copyright 2012-2014 Imagination Technologies Ltd.
      6 */
      7
      8#include "img-ir-hw.h"
      9
     10/* Convert RC5 data to a scancode */
     11static int img_ir_rc5_scancode(int len, u64 raw, u64 enabled_protocols,
     12				struct img_ir_scancode_req *request)
     13{
     14	unsigned int addr, cmd, tgl, start;
     15
     16	/* Quirk in the decoder shifts everything by 2 to the left. */
     17	raw   >>= 2;
     18
     19	start	=  (raw >> 13)	& 0x01;
     20	tgl	=  (raw >> 11)	& 0x01;
     21	addr	=  (raw >>  6)	& 0x1f;
     22	cmd	=   raw		& 0x3f;
     23	/*
     24	 * 12th bit is used to extend the command in extended RC5 and has
     25	 * no effect on standard RC5.
     26	 */
     27	cmd	+= ((raw >> 12) & 0x01) ? 0 : 0x40;
     28
     29	if (!start)
     30		return -EINVAL;
     31
     32	request->protocol = RC_PROTO_RC5;
     33	request->scancode = addr << 8 | cmd;
     34	request->toggle   = tgl;
     35	return IMG_IR_SCANCODE;
     36}
     37
     38/* Convert RC5 scancode to RC5 data filter */
     39static int img_ir_rc5_filter(const struct rc_scancode_filter *in,
     40				 struct img_ir_filter *out, u64 protocols)
     41{
     42	/* Not supported by the hw. */
     43	return -EINVAL;
     44}
     45
     46/*
     47 * RC-5 decoder
     48 * see http://www.sbprojects.com/knowledge/ir/rc5.php
     49 */
     50struct img_ir_decoder img_ir_rc5 = {
     51	.type      = RC_PROTO_BIT_RC5,
     52	.control   = {
     53		.bitoriend2	= 1,
     54		.code_type	= IMG_IR_CODETYPE_BIPHASE,
     55		.decodend2	= 1,
     56	},
     57	/* main timings */
     58	.tolerance	= 16,
     59	.unit		= 888888, /* 1/36k*32=888.888microseconds */
     60	.timings	= {
     61		/* 10 symbol */
     62		.s10 = {
     63			.pulse	= { 1 },
     64			.space	= { 1 },
     65		},
     66
     67		/* 11 symbol */
     68		.s11 = {
     69			.pulse	= { 1 },
     70			.space	= { 1 },
     71		},
     72
     73		/* free time */
     74		.ft  = {
     75			.minlen = 14,
     76			.maxlen = 14,
     77			.ft_min = 5,
     78		},
     79	},
     80
     81	/* scancode logic */
     82	.scancode	= img_ir_rc5_scancode,
     83	.filter		= img_ir_rc5_filter,
     84};