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3fe29c89 DH |
1 | /* ir-sony-decoder.c - handle Sony IR Pulse/Space protocol |
2 | * | |
3 | * Copyright (C) 2010 by David Härdeman <david@hardeman.nu> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation version 2 of the License. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/bitrev.h> | |
7a707b89 | 16 | #include <linux/module.h> |
f62de675 | 17 | #include "rc-core-priv.h" |
3fe29c89 DH |
18 | |
19 | #define SONY_UNIT 600000 /* ns */ | |
20 | #define SONY_HEADER_PULSE (4 * SONY_UNIT) | |
21 | #define SONY_HEADER_SPACE (1 * SONY_UNIT) | |
22 | #define SONY_BIT_0_PULSE (1 * SONY_UNIT) | |
23 | #define SONY_BIT_1_PULSE (2 * SONY_UNIT) | |
24 | #define SONY_BIT_SPACE (1 * SONY_UNIT) | |
25 | #define SONY_TRAILER_SPACE (10 * SONY_UNIT) /* minimum */ | |
26 | ||
3fe29c89 DH |
27 | enum sony_state { |
28 | STATE_INACTIVE, | |
29 | STATE_HEADER_SPACE, | |
30 | STATE_BIT_PULSE, | |
31 | STATE_BIT_SPACE, | |
32 | STATE_FINISHED, | |
33 | }; | |
34 | ||
3fe29c89 DH |
35 | /** |
36 | * ir_sony_decode() - Decode one Sony pulse or space | |
d8b4b582 | 37 | * @dev: the struct rc_dev descriptor of the device |
3fe29c89 DH |
38 | * @ev: the struct ir_raw_event descriptor of the pulse/space |
39 | * | |
40 | * This function returns -EINVAL if the pulse violates the state machine | |
41 | */ | |
d8b4b582 | 42 | static int ir_sony_decode(struct rc_dev *dev, struct ir_raw_event ev) |
3fe29c89 | 43 | { |
d8b4b582 | 44 | struct sony_dec *data = &dev->raw->sony; |
3fe29c89 DH |
45 | u32 scancode; |
46 | u8 device, subdevice, function; | |
47 | ||
c003ab1b DH |
48 | if (!(dev->raw->enabled_protocols & |
49 | (RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20))) | |
3fe29c89 DH |
50 | return 0; |
51 | ||
4651918a ML |
52 | if (!is_timing_event(ev)) { |
53 | if (ev.reset) | |
54 | data->state = STATE_INACTIVE; | |
3fe29c89 DH |
55 | return 0; |
56 | } | |
57 | ||
58 | if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) | |
59 | goto out; | |
60 | ||
61 | IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n", | |
62 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
63 | ||
64 | switch (data->state) { | |
65 | ||
66 | case STATE_INACTIVE: | |
67 | if (!ev.pulse) | |
68 | break; | |
69 | ||
70 | if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2)) | |
71 | break; | |
72 | ||
73 | data->count = 0; | |
74 | data->state = STATE_HEADER_SPACE; | |
75 | return 0; | |
76 | ||
77 | case STATE_HEADER_SPACE: | |
78 | if (ev.pulse) | |
79 | break; | |
80 | ||
81 | if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2)) | |
82 | break; | |
83 | ||
84 | data->state = STATE_BIT_PULSE; | |
85 | return 0; | |
86 | ||
87 | case STATE_BIT_PULSE: | |
88 | if (!ev.pulse) | |
89 | break; | |
90 | ||
c216369e | 91 | data->bits <<= 1; |
3fe29c89 | 92 | if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2)) |
c216369e | 93 | data->bits |= 1; |
3fe29c89 DH |
94 | else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2)) |
95 | break; | |
96 | ||
97 | data->count++; | |
98 | data->state = STATE_BIT_SPACE; | |
99 | return 0; | |
100 | ||
101 | case STATE_BIT_SPACE: | |
102 | if (ev.pulse) | |
103 | break; | |
104 | ||
105 | if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2)) | |
106 | break; | |
107 | ||
108 | decrease_duration(&ev, SONY_BIT_SPACE); | |
109 | ||
110 | if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) { | |
111 | data->state = STATE_BIT_PULSE; | |
112 | return 0; | |
113 | } | |
114 | ||
115 | data->state = STATE_FINISHED; | |
116 | /* Fall through */ | |
117 | ||
118 | case STATE_FINISHED: | |
119 | if (ev.pulse) | |
120 | break; | |
121 | ||
122 | if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2)) | |
123 | break; | |
124 | ||
125 | switch (data->count) { | |
126 | case 12: | |
c003ab1b DH |
127 | if (!(dev->raw->enabled_protocols & RC_BIT_SONY12)) { |
128 | data->state = STATE_INACTIVE; | |
129 | return 0; | |
130 | } | |
c216369e | 131 | device = bitrev8((data->bits << 3) & 0xF8); |
3fe29c89 | 132 | subdevice = 0; |
c216369e | 133 | function = bitrev8((data->bits >> 4) & 0xFE); |
3fe29c89 DH |
134 | break; |
135 | case 15: | |
c003ab1b DH |
136 | if (!(dev->raw->enabled_protocols & RC_BIT_SONY15)) { |
137 | data->state = STATE_INACTIVE; | |
138 | return 0; | |
139 | } | |
c216369e | 140 | device = bitrev8((data->bits >> 0) & 0xFF); |
3fe29c89 | 141 | subdevice = 0; |
ec9ee8e2 | 142 | function = bitrev8((data->bits >> 7) & 0xFE); |
3fe29c89 DH |
143 | break; |
144 | case 20: | |
c003ab1b DH |
145 | if (!(dev->raw->enabled_protocols & RC_BIT_SONY20)) { |
146 | data->state = STATE_INACTIVE; | |
147 | return 0; | |
148 | } | |
c216369e DH |
149 | device = bitrev8((data->bits >> 5) & 0xF8); |
150 | subdevice = bitrev8((data->bits >> 0) & 0xFF); | |
151 | function = bitrev8((data->bits >> 12) & 0xFE); | |
3fe29c89 DH |
152 | break; |
153 | default: | |
154 | IR_dprintk(1, "Sony invalid bitcount %u\n", data->count); | |
155 | goto out; | |
156 | } | |
157 | ||
158 | scancode = device << 16 | subdevice << 8 | function; | |
159 | IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode); | |
ca86674b | 160 | rc_keydown(dev, scancode, 0); |
3fe29c89 DH |
161 | data->state = STATE_INACTIVE; |
162 | return 0; | |
163 | } | |
164 | ||
165 | out: | |
166 | IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n", | |
167 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
168 | data->state = STATE_INACTIVE; | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
3fe29c89 | 172 | static struct ir_raw_handler sony_handler = { |
c003ab1b | 173 | .protocols = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20, |
3fe29c89 | 174 | .decode = ir_sony_decode, |
3fe29c89 DH |
175 | }; |
176 | ||
177 | static int __init ir_sony_decode_init(void) | |
178 | { | |
179 | ir_raw_handler_register(&sony_handler); | |
180 | ||
181 | printk(KERN_INFO "IR Sony protocol handler initialized\n"); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static void __exit ir_sony_decode_exit(void) | |
186 | { | |
187 | ir_raw_handler_unregister(&sony_handler); | |
188 | } | |
189 | ||
190 | module_init(ir_sony_decode_init); | |
191 | module_exit(ir_sony_decode_exit); | |
192 | ||
193 | MODULE_LICENSE("GPL"); | |
194 | MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); | |
195 | MODULE_DESCRIPTION("Sony IR protocol decoder"); |