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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 | ||
52b66144 | 48 | if (!(dev->raw->enabled_protocols & RC_TYPE_SONY)) |
3fe29c89 DH |
49 | return 0; |
50 | ||
4651918a ML |
51 | if (!is_timing_event(ev)) { |
52 | if (ev.reset) | |
53 | data->state = STATE_INACTIVE; | |
3fe29c89 DH |
54 | return 0; |
55 | } | |
56 | ||
57 | if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) | |
58 | goto out; | |
59 | ||
60 | IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n", | |
61 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
62 | ||
63 | switch (data->state) { | |
64 | ||
65 | case STATE_INACTIVE: | |
66 | if (!ev.pulse) | |
67 | break; | |
68 | ||
69 | if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2)) | |
70 | break; | |
71 | ||
72 | data->count = 0; | |
73 | data->state = STATE_HEADER_SPACE; | |
74 | return 0; | |
75 | ||
76 | case STATE_HEADER_SPACE: | |
77 | if (ev.pulse) | |
78 | break; | |
79 | ||
80 | if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2)) | |
81 | break; | |
82 | ||
83 | data->state = STATE_BIT_PULSE; | |
84 | return 0; | |
85 | ||
86 | case STATE_BIT_PULSE: | |
87 | if (!ev.pulse) | |
88 | break; | |
89 | ||
c216369e | 90 | data->bits <<= 1; |
3fe29c89 | 91 | if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2)) |
c216369e | 92 | data->bits |= 1; |
3fe29c89 DH |
93 | else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2)) |
94 | break; | |
95 | ||
96 | data->count++; | |
97 | data->state = STATE_BIT_SPACE; | |
98 | return 0; | |
99 | ||
100 | case STATE_BIT_SPACE: | |
101 | if (ev.pulse) | |
102 | break; | |
103 | ||
104 | if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2)) | |
105 | break; | |
106 | ||
107 | decrease_duration(&ev, SONY_BIT_SPACE); | |
108 | ||
109 | if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) { | |
110 | data->state = STATE_BIT_PULSE; | |
111 | return 0; | |
112 | } | |
113 | ||
114 | data->state = STATE_FINISHED; | |
115 | /* Fall through */ | |
116 | ||
117 | case STATE_FINISHED: | |
118 | if (ev.pulse) | |
119 | break; | |
120 | ||
121 | if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2)) | |
122 | break; | |
123 | ||
124 | switch (data->count) { | |
125 | case 12: | |
c216369e | 126 | device = bitrev8((data->bits << 3) & 0xF8); |
3fe29c89 | 127 | subdevice = 0; |
c216369e | 128 | function = bitrev8((data->bits >> 4) & 0xFE); |
3fe29c89 DH |
129 | break; |
130 | case 15: | |
c216369e | 131 | device = bitrev8((data->bits >> 0) & 0xFF); |
3fe29c89 | 132 | subdevice = 0; |
c216369e | 133 | function = bitrev8((data->bits >> 7) & 0xFD); |
3fe29c89 DH |
134 | break; |
135 | case 20: | |
c216369e DH |
136 | device = bitrev8((data->bits >> 5) & 0xF8); |
137 | subdevice = bitrev8((data->bits >> 0) & 0xFF); | |
138 | function = bitrev8((data->bits >> 12) & 0xFE); | |
3fe29c89 DH |
139 | break; |
140 | default: | |
141 | IR_dprintk(1, "Sony invalid bitcount %u\n", data->count); | |
142 | goto out; | |
143 | } | |
144 | ||
145 | scancode = device << 16 | subdevice << 8 | function; | |
146 | IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode); | |
ca86674b | 147 | rc_keydown(dev, scancode, 0); |
3fe29c89 DH |
148 | data->state = STATE_INACTIVE; |
149 | return 0; | |
150 | } | |
151 | ||
152 | out: | |
153 | IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n", | |
154 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
155 | data->state = STATE_INACTIVE; | |
156 | return -EINVAL; | |
157 | } | |
158 | ||
3fe29c89 | 159 | static struct ir_raw_handler sony_handler = { |
52b66144 | 160 | .protocols = RC_TYPE_SONY, |
3fe29c89 | 161 | .decode = ir_sony_decode, |
3fe29c89 DH |
162 | }; |
163 | ||
164 | static int __init ir_sony_decode_init(void) | |
165 | { | |
166 | ir_raw_handler_register(&sony_handler); | |
167 | ||
168 | printk(KERN_INFO "IR Sony protocol handler initialized\n"); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | static void __exit ir_sony_decode_exit(void) | |
173 | { | |
174 | ir_raw_handler_unregister(&sony_handler); | |
175 | } | |
176 | ||
177 | module_init(ir_sony_decode_init); | |
178 | module_exit(ir_sony_decode_exit); | |
179 | ||
180 | MODULE_LICENSE("GPL"); | |
181 | MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); | |
182 | MODULE_DESCRIPTION("Sony IR protocol decoder"); |