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};
126