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-sharp.c (2214B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * ImgTec IR Decoder setup for Sharp protocol.
      4 *
      5 * Copyright 2012-2014 Imagination Technologies Ltd.
      6 */
      7
      8#include "img-ir-hw.h"
      9
     10/* Convert Sharp data to a scancode */
     11static int img_ir_sharp_scancode(int len, u64 raw, u64 enabled_protocols,
     12				 struct img_ir_scancode_req *request)
     13{
     14	unsigned int addr, cmd, exp, chk;
     15
     16	if (len != 15)
     17		return -EINVAL;
     18
     19	addr = (raw >>   0) & 0x1f;
     20	cmd  = (raw >>   5) & 0xff;
     21	exp  = (raw >>  13) &  0x1;
     22	chk  = (raw >>  14) &  0x1;
     23
     24	/* validate data */
     25	if (!exp)
     26		return -EINVAL;
     27	if (chk)
     28		/* probably the second half of the message */
     29		return -EINVAL;
     30
     31	request->protocol = RC_PROTO_SHARP;
     32	request->scancode = addr << 8 | cmd;
     33	return IMG_IR_SCANCODE;
     34}
     35
     36/* Convert Sharp scancode to Sharp data filter */
     37static int img_ir_sharp_filter(const struct rc_scancode_filter *in,
     38			       struct img_ir_filter *out, u64 protocols)
     39{
     40	unsigned int addr, cmd, exp = 0, chk = 0;
     41	unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;
     42
     43	addr   = (in->data >> 8) & 0x1f;
     44	addr_m = (in->mask >> 8) & 0x1f;
     45	cmd    = (in->data >> 0) & 0xff;
     46	cmd_m  = (in->mask >> 0) & 0xff;
     47	if (cmd_m) {
     48		/* if filtering commands, we can only match the first part */
     49		exp   = 1;
     50		exp_m = 1;
     51		chk   = 0;
     52		chk_m = 1;
     53	}
     54
     55	out->data = addr        |
     56		    cmd   <<  5 |
     57		    exp   << 13 |
     58		    chk   << 14;
     59	out->mask = addr_m      |
     60		    cmd_m <<  5 |
     61		    exp_m << 13 |
     62		    chk_m << 14;
     63
     64	return 0;
     65}
     66
     67/*
     68 * Sharp decoder
     69 * See also http://www.sbprojects.com/knowledge/ir/sharp.php
     70 */
     71struct img_ir_decoder img_ir_sharp = {
     72	.type = RC_PROTO_BIT_SHARP,
     73	.control = {
     74		.decoden = 0,
     75		.decodend2 = 1,
     76		.code_type = IMG_IR_CODETYPE_PULSEDIST,
     77		.d1validsel = 1,
     78	},
     79	/* main timings */
     80	.tolerance = 20,	/* 20% */
     81	.timings = {
     82		/* 0 symbol */
     83		.s10 = {
     84			.pulse = { 320	/* 320 us */ },
     85			.space = { 680	/* 1 ms period */ },
     86		},
     87		/* 1 symbol */
     88		.s11 = {
     89			.pulse = { 320	/* 320 us */ },
     90			.space = { 1680	/* 2 ms period */ },
     91		},
     92		/* free time */
     93		.ft = {
     94			.minlen = 15,
     95			.maxlen = 15,
     96			.ft_min = 5000,	/* 5 ms */
     97		},
     98	},
     99	/* scancode logic */
    100	.scancode = img_ir_sharp_scancode,
    101	.filter = img_ir_sharp_filter,
    102};