1 /*
2 * ImgTec IR Decoder setup for Sony (SIRC) 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
12 #include "img-ir-hw.h"
13
14 /* Convert Sony data to a scancode */
img_ir_sony_scancode(int len,u64 raw,u64 enabled_protocols,struct img_ir_scancode_req * request)15 static int img_ir_sony_scancode(int len, u64 raw, u64 enabled_protocols,
16 struct img_ir_scancode_req *request)
17 {
18 unsigned int dev, subdev, func;
19
20 switch (len) {
21 case 12:
22 if (!(enabled_protocols & RC_PROTO_BIT_SONY12))
23 return -EINVAL;
24 func = raw & 0x7f; /* first 7 bits */
25 raw >>= 7;
26 dev = raw & 0x1f; /* next 5 bits */
27 subdev = 0;
28 request->protocol = RC_PROTO_SONY12;
29 break;
30 case 15:
31 if (!(enabled_protocols & RC_PROTO_BIT_SONY15))
32 return -EINVAL;
33 func = raw & 0x7f; /* first 7 bits */
34 raw >>= 7;
35 dev = raw & 0xff; /* next 8 bits */
36 subdev = 0;
37 request->protocol = RC_PROTO_SONY15;
38 break;
39 case 20:
40 if (!(enabled_protocols & RC_PROTO_BIT_SONY20))
41 return -EINVAL;
42 func = raw & 0x7f; /* first 7 bits */
43 raw >>= 7;
44 dev = raw & 0x1f; /* next 5 bits */
45 raw >>= 5;
46 subdev = raw & 0xff; /* next 8 bits */
47 request->protocol = RC_PROTO_SONY20;
48 break;
49 default:
50 return -EINVAL;
51 }
52 request->scancode = dev << 16 | subdev << 8 | func;
53 return IMG_IR_SCANCODE;
54 }
55
56 /* Convert NEC scancode to NEC data filter */
img_ir_sony_filter(const struct rc_scancode_filter * in,struct img_ir_filter * out,u64 protocols)57 static int img_ir_sony_filter(const struct rc_scancode_filter *in,
58 struct img_ir_filter *out, u64 protocols)
59 {
60 unsigned int dev, subdev, func;
61 unsigned int dev_m, subdev_m, func_m;
62 unsigned int len = 0;
63
64 dev = (in->data >> 16) & 0xff;
65 dev_m = (in->mask >> 16) & 0xff;
66 subdev = (in->data >> 8) & 0xff;
67 subdev_m = (in->mask >> 8) & 0xff;
68 func = (in->data >> 0) & 0x7f;
69 func_m = (in->mask >> 0) & 0x7f;
70
71 protocols &= RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 |
72 RC_PROTO_BIT_SONY20;
73
74 /*
75 * If only one bit is set, we were requested to do an exact
76 * protocol. This should be the case for wakeup filters; for
77 * normal filters, guess the protocol from the scancode.
78 */
79 if (!is_power_of_2(protocols)) {
80 if (subdev & subdev_m)
81 protocols = RC_PROTO_BIT_SONY20;
82 else if (dev & dev_m & 0xe0)
83 protocols = RC_PROTO_BIT_SONY15;
84 else
85 protocols = RC_PROTO_BIT_SONY12;
86 }
87
88 if (protocols == RC_PROTO_BIT_SONY20) {
89 /* can't encode subdev and higher device bits */
90 if (dev & dev_m & 0xe0)
91 return -EINVAL;
92 len = 20;
93 dev_m &= 0x1f;
94 } else if (protocols == RC_PROTO_BIT_SONY15) {
95 len = 15;
96 subdev_m = 0;
97 } else {
98 /*
99 * The hardware mask cannot distinguish high device bits and low
100 * extended bits, so logically AND those bits of the masks
101 * together.
102 */
103 subdev_m &= (dev_m >> 5) | 0xf8;
104 dev_m &= 0x1f;
105 }
106
107 /* ensure there aren't any bits straying between fields */
108 dev &= dev_m;
109 subdev &= subdev_m;
110
111 /* write the hardware filter */
112 out->data = func |
113 dev << 7 |
114 subdev << 15;
115 out->mask = func_m |
116 dev_m << 7 |
117 subdev_m << 15;
118
119 if (len) {
120 out->minlen = len;
121 out->maxlen = len;
122 }
123 return 0;
124 }
125
126 /*
127 * Sony SIRC decoder
128 * See also http://www.sbprojects.com/knowledge/ir/sirc.php
129 * http://picprojects.org.uk/projects/sirc/sonysirc.pdf
130 */
131 struct img_ir_decoder img_ir_sony = {
132 .type = RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 | RC_PROTO_BIT_SONY20,
133 .control = {
134 .decoden = 1,
135 .code_type = IMG_IR_CODETYPE_PULSELEN,
136 },
137 /* main timings */
138 .unit = 600000, /* 600 us */
139 .timings = {
140 /* leader symbol */
141 .ldr = {
142 .pulse = { 4 /* 2.4 ms */ },
143 .space = { 1 /* 600 us */ },
144 },
145 /* 0 symbol */
146 .s00 = {
147 .pulse = { 1 /* 600 us */ },
148 .space = { 1 /* 600 us */ },
149 },
150 /* 1 symbol */
151 .s01 = {
152 .pulse = { 2 /* 1.2 ms */ },
153 .space = { 1 /* 600 us */ },
154 },
155 /* free time */
156 .ft = {
157 .minlen = 12,
158 .maxlen = 20,
159 .ft_min = 10, /* 6 ms */
160 },
161 },
162 /* scancode logic */
163 .scancode = img_ir_sony_scancode,
164 .filter = img_ir_sony_filter,
165 };
166