img-ir-sanyo.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * ImgTec IR Decoder setup for Sanyo protocol.
  4 *
  5 * Copyright 2012-2014 Imagination Technologies Ltd.
  6 *
  7 * From ir-sanyo-decoder.c:
  8 *
  9 * This protocol uses the NEC protocol timings. However, data is formatted as:
 10 *	13 bits Custom Code
 11 *	13 bits NOT(Custom Code)
 12 *	8 bits Key data
 13 *	8 bits NOT(Key data)
 14 *
 15 * According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon
 16 * Information for this protocol is available at the Sanyo LC7461 datasheet.
 17 */
 18
 19#include "img-ir-hw.h"
 20
 21/* Convert Sanyo data to a scancode */
 22static int img_ir_sanyo_scancode(int len, u64 raw, u64 enabled_protocols,
 23				 struct img_ir_scancode_req *request)
 24{
 25	unsigned int addr, addr_inv, data, data_inv;
 26	/* a repeat code has no data */
 27	if (!len)
 28		return IMG_IR_REPEATCODE;
 29	if (len != 42)
 30		return -EINVAL;
 31	addr     = (raw >>  0) & 0x1fff;
 32	addr_inv = (raw >> 13) & 0x1fff;
 33	data     = (raw >> 26) & 0xff;
 34	data_inv = (raw >> 34) & 0xff;
 35	/* Validate data */
 36	if ((data_inv ^ data) != 0xff)
 37		return -EINVAL;
 38	/* Validate address */
 39	if ((addr_inv ^ addr) != 0x1fff)
 40		return -EINVAL;
 41
 42	/* Normal Sanyo */
 43	request->protocol = RC_PROTO_SANYO;
 44	request->scancode = addr << 8 | data;
 45	return IMG_IR_SCANCODE;
 46}
 47
 48/* Convert Sanyo scancode to Sanyo data filter */
 49static int img_ir_sanyo_filter(const struct rc_scancode_filter *in,
 50			       struct img_ir_filter *out, u64 protocols)
 51{
 52	unsigned int addr, addr_inv, data, data_inv;
 53	unsigned int addr_m, data_m;
 54
 55	data = in->data & 0xff;
 56	data_m = in->mask & 0xff;
 57	data_inv = data ^ 0xff;
 58
 59	if (in->data & 0xff700000)
 60		return -EINVAL;
 61
 62	addr       = (in->data >> 8) & 0x1fff;
 63	addr_m     = (in->mask >> 8) & 0x1fff;
 64	addr_inv   = addr ^ 0x1fff;
 65
 66	out->data = (u64)data_inv << 34 |
 67		    (u64)data     << 26 |
 68			 addr_inv << 13 |
 69			 addr;
 70	out->mask = (u64)data_m << 34 |
 71		    (u64)data_m << 26 |
 72			 addr_m << 13 |
 73			 addr_m;
 74	return 0;
 75}
 76
 77/* Sanyo decoder */
 78struct img_ir_decoder img_ir_sanyo = {
 79	.type = RC_PROTO_BIT_SANYO,
 80	.control = {
 81		.decoden = 1,
 82		.code_type = IMG_IR_CODETYPE_PULSEDIST,
 83	},
 84	/* main timings */
 85	.unit = 562500, /* 562.5 us */
 86	.timings = {
 87		/* leader symbol */
 88		.ldr = {
 89			.pulse = { 16	/* 9ms */ },
 90			.space = { 8	/* 4.5ms */ },
 91		},
 92		/* 0 symbol */
 93		.s00 = {
 94			.pulse = { 1	/* 562.5 us */ },
 95			.space = { 1	/* 562.5 us */ },
 96		},
 97		/* 1 symbol */
 98		.s01 = {
 99			.pulse = { 1	/* 562.5 us */ },
100			.space = { 3	/* 1687.5 us */ },
101		},
102		/* free time */
103		.ft = {
104			.minlen = 42,
105			.maxlen = 42,
106			.ft_min = 10,	/* 5.625 ms */
107		},
108	},
109	/* repeat codes */
110	.repeat = 108,			/* 108 ms */
111	.rtimings = {
112		/* leader symbol */
113		.ldr = {
114			.space = { 4	/* 2.25 ms */ },
115		},
116		/* free time */
117		.ft = {
118			.minlen = 0,	/* repeat code has no data */
119			.maxlen = 0,
120		},
121	},
122	/* scancode logic */
123	.scancode = img_ir_sanyo_scancode,
124	.filter = img_ir_sanyo_filter,
125};