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-sony.c (3936B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * ImgTec IR Decoder setup for Sony (SIRC) protocol.
      4 *
      5 * Copyright 2012-2014 Imagination Technologies Ltd.
      6 */
      7
      8#include "img-ir-hw.h"
      9
     10/* Convert Sony data to a scancode */
     11static int img_ir_sony_scancode(int len, u64 raw, u64 enabled_protocols,
     12				struct img_ir_scancode_req *request)
     13{
     14	unsigned int dev, subdev, func;
     15
     16	switch (len) {
     17	case 12:
     18		if (!(enabled_protocols & RC_PROTO_BIT_SONY12))
     19			return -EINVAL;
     20		func   = raw & 0x7f;	/* first 7 bits */
     21		raw    >>= 7;
     22		dev    = raw & 0x1f;	/* next 5 bits */
     23		subdev = 0;
     24		request->protocol = RC_PROTO_SONY12;
     25		break;
     26	case 15:
     27		if (!(enabled_protocols & RC_PROTO_BIT_SONY15))
     28			return -EINVAL;
     29		func   = raw & 0x7f;	/* first 7 bits */
     30		raw    >>= 7;
     31		dev    = raw & 0xff;	/* next 8 bits */
     32		subdev = 0;
     33		request->protocol = RC_PROTO_SONY15;
     34		break;
     35	case 20:
     36		if (!(enabled_protocols & RC_PROTO_BIT_SONY20))
     37			return -EINVAL;
     38		func   = raw & 0x7f;	/* first 7 bits */
     39		raw    >>= 7;
     40		dev    = raw & 0x1f;	/* next 5 bits */
     41		raw    >>= 5;
     42		subdev = raw & 0xff;	/* next 8 bits */
     43		request->protocol = RC_PROTO_SONY20;
     44		break;
     45	default:
     46		return -EINVAL;
     47	}
     48	request->scancode = dev << 16 | subdev << 8 | func;
     49	return IMG_IR_SCANCODE;
     50}
     51
     52/* Convert NEC scancode to NEC data filter */
     53static int img_ir_sony_filter(const struct rc_scancode_filter *in,
     54			      struct img_ir_filter *out, u64 protocols)
     55{
     56	unsigned int dev, subdev, func;
     57	unsigned int dev_m, subdev_m, func_m;
     58	unsigned int len = 0;
     59
     60	dev      = (in->data >> 16) & 0xff;
     61	dev_m    = (in->mask >> 16) & 0xff;
     62	subdev   = (in->data >> 8)  & 0xff;
     63	subdev_m = (in->mask >> 8)  & 0xff;
     64	func     = (in->data >> 0)  & 0x7f;
     65	func_m   = (in->mask >> 0)  & 0x7f;
     66
     67	protocols &= RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 |
     68							RC_PROTO_BIT_SONY20;
     69
     70	/*
     71	 * If only one bit is set, we were requested to do an exact
     72	 * protocol. This should be the case for wakeup filters; for
     73	 * normal filters, guess the protocol from the scancode.
     74	 */
     75	if (!is_power_of_2(protocols)) {
     76		if (subdev & subdev_m)
     77			protocols = RC_PROTO_BIT_SONY20;
     78		else if (dev & dev_m & 0xe0)
     79			protocols = RC_PROTO_BIT_SONY15;
     80		else
     81			protocols = RC_PROTO_BIT_SONY12;
     82	}
     83
     84	if (protocols == RC_PROTO_BIT_SONY20) {
     85		/* can't encode subdev and higher device bits */
     86		if (dev & dev_m & 0xe0)
     87			return -EINVAL;
     88		len = 20;
     89		dev_m &= 0x1f;
     90	} else if (protocols == RC_PROTO_BIT_SONY15) {
     91		len = 15;
     92		subdev_m = 0;
     93	} else {
     94		/*
     95		 * The hardware mask cannot distinguish high device bits and low
     96		 * extended bits, so logically AND those bits of the masks
     97		 * together.
     98		 */
     99		subdev_m &= (dev_m >> 5) | 0xf8;
    100		dev_m &= 0x1f;
    101	}
    102
    103	/* ensure there aren't any bits straying between fields */
    104	dev &= dev_m;
    105	subdev &= subdev_m;
    106
    107	/* write the hardware filter */
    108	out->data = func          |
    109		    dev      << 7 |
    110		    subdev   << 15;
    111	out->mask = func_m        |
    112		    dev_m    << 7 |
    113		    subdev_m << 15;
    114
    115	if (len) {
    116		out->minlen = len;
    117		out->maxlen = len;
    118	}
    119	return 0;
    120}
    121
    122/*
    123 * Sony SIRC decoder
    124 * See also http://www.sbprojects.com/knowledge/ir/sirc.php
    125 *          http://picprojects.org.uk/projects/sirc/sonysirc.pdf
    126 */
    127struct img_ir_decoder img_ir_sony = {
    128	.type = RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 | RC_PROTO_BIT_SONY20,
    129	.control = {
    130		.decoden = 1,
    131		.code_type = IMG_IR_CODETYPE_PULSELEN,
    132	},
    133	/* main timings */
    134	.unit = 600000, /* 600 us */
    135	.timings = {
    136		/* leader symbol */
    137		.ldr = {
    138			.pulse = { 4	/* 2.4 ms */ },
    139			.space = { 1	/* 600 us */ },
    140		},
    141		/* 0 symbol */
    142		.s00 = {
    143			.pulse = { 1	/* 600 us */ },
    144			.space = { 1	/* 600 us */ },
    145		},
    146		/* 1 symbol */
    147		.s01 = {
    148			.pulse = { 2	/* 1.2 ms */ },
    149			.space = { 1	/* 600 us */ },
    150		},
    151		/* free time */
    152		.ft = {
    153			.minlen = 12,
    154			.maxlen = 20,
    155			.ft_min = 10,	/* 6 ms */
    156		},
    157	},
    158	/* scancode logic */
    159	.scancode = img_ir_sony_scancode,
    160	.filter = img_ir_sony_filter,
    161};