1/*
2 * ImgTec IR Decoder setup for Sanyo protocol.
3 *
4 * Copyright 2012-2014 Imagination Technologies Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * From ir-sanyo-decoder.c:
12 *
13 * This protocol uses the NEC protocol timings. However, data is formatted as:
14 *	13 bits Custom Code
15 *	13 bits NOT(Custom Code)
16 *	8 bits Key data
17 *	8 bits NOT(Key data)
18 *
19 * According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon
20 * Information for this protocol is available at the Sanyo LC7461 datasheet.
21 */
22
23#include "img-ir-hw.h"
24
25/* Convert Sanyo data to a scancode */
26static int img_ir_sanyo_scancode(int len, u64 raw, u64 enabled_protocols,
27				 struct img_ir_scancode_req *request)
28{
29	unsigned int addr, addr_inv, data, data_inv;
30	/* a repeat code has no data */
31	if (!len)
32		return IMG_IR_REPEATCODE;
33	if (len != 42)
34		return -EINVAL;
35	addr     = (raw >>  0) & 0x1fff;
36	addr_inv = (raw >> 13) & 0x1fff;
37	data     = (raw >> 26) & 0xff;
38	data_inv = (raw >> 34) & 0xff;
39	/* Validate data */
40	if ((data_inv ^ data) != 0xff)
41		return -EINVAL;
42	/* Validate address */
43	if ((addr_inv ^ addr) != 0x1fff)
44		return -EINVAL;
45
46	/* Normal Sanyo */
47	request->protocol = RC_TYPE_SANYO;
48	request->scancode = addr << 8 | data;
49	return IMG_IR_SCANCODE;
50}
51
52/* Convert Sanyo scancode to Sanyo data filter */
53static int img_ir_sanyo_filter(const struct rc_scancode_filter *in,
54			       struct img_ir_filter *out, u64 protocols)
55{
56	unsigned int addr, addr_inv, data, data_inv;
57	unsigned int addr_m, data_m;
58
59	data = in->data & 0xff;
60	data_m = in->mask & 0xff;
61	data_inv = data ^ 0xff;
62
63	if (in->data & 0xff700000)
64		return -EINVAL;
65
66	addr       = (in->data >> 8) & 0x1fff;
67	addr_m     = (in->mask >> 8) & 0x1fff;
68	addr_inv   = addr ^ 0x1fff;
69
70	out->data = (u64)data_inv << 34 |
71		    (u64)data     << 26 |
72			 addr_inv << 13 |
73			 addr;
74	out->mask = (u64)data_m << 34 |
75		    (u64)data_m << 26 |
76			 addr_m << 13 |
77			 addr_m;
78	return 0;
79}
80
81/* Sanyo decoder */
82struct img_ir_decoder img_ir_sanyo = {
83	.type = RC_BIT_SANYO,
84	.control = {
85		.decoden = 1,
86		.code_type = IMG_IR_CODETYPE_PULSEDIST,
87	},
88	/* main timings */
89	.unit = 562500, /* 562.5 us */
90	.timings = {
91		/* leader symbol */
92		.ldr = {
93			.pulse = { 16	/* 9ms */ },
94			.space = { 8	/* 4.5ms */ },
95		},
96		/* 0 symbol */
97		.s00 = {
98			.pulse = { 1	/* 562.5 us */ },
99			.space = { 1	/* 562.5 us */ },
100		},
101		/* 1 symbol */
102		.s01 = {
103			.pulse = { 1	/* 562.5 us */ },
104			.space = { 3	/* 1687.5 us */ },
105		},
106		/* free time */
107		.ft = {
108			.minlen = 42,
109			.maxlen = 42,
110			.ft_min = 10,	/* 5.625 ms */
111		},
112	},
113	/* repeat codes */
114	.repeat = 108,			/* 108 ms */
115	.rtimings = {
116		/* leader symbol */
117		.ldr = {
118			.space = { 4	/* 2.25 ms */ },
119		},
120		/* free time */
121		.ft = {
122			.minlen = 0,	/* repeat code has no data */
123			.maxlen = 0,
124		},
125	},
126	/* scancode logic */
127	.scancode = img_ir_sanyo_scancode,
128	.filter = img_ir_sanyo_filter,
129};
130