img-ir-sharp.c

  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};