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 */
26 static 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_PROTO_SANYO;
48 	request->scancode = addr << 8 | data;
49 	return IMG_IR_SCANCODE;
50 }
51 
52 /* Convert Sanyo scancode to Sanyo data filter */
53 static 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 */
82 struct img_ir_decoder img_ir_sanyo = {
83 	.type = RC_PROTO_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