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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; |
120703f9 | 45 | enum rc_type protocol; |
3fe29c89 DH |
46 | u32 scancode; |
47 | u8 device, subdevice, function; | |
48 | ||
c5540fbb DH |
49 | if (!(dev->enabled_protocols & |
50 | (RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20))) | |
3fe29c89 DH |
51 | return 0; |
52 | ||
4651918a ML |
53 | if (!is_timing_event(ev)) { |
54 | if (ev.reset) | |
55 | data->state = STATE_INACTIVE; | |
3fe29c89 DH |
56 | return 0; |
57 | } | |
58 | ||
59 | if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) | |
60 | goto out; | |
61 | ||
62 | IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n", | |
63 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
64 | ||
65 | switch (data->state) { | |
66 | ||
67 | case STATE_INACTIVE: | |
68 | if (!ev.pulse) | |
69 | break; | |
70 | ||
71 | if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2)) | |
72 | break; | |
73 | ||
74 | data->count = 0; | |
75 | data->state = STATE_HEADER_SPACE; | |
76 | return 0; | |
77 | ||
78 | case STATE_HEADER_SPACE: | |
79 | if (ev.pulse) | |
80 | break; | |
81 | ||
82 | if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2)) | |
83 | break; | |
84 | ||
85 | data->state = STATE_BIT_PULSE; | |
86 | return 0; | |
87 | ||
88 | case STATE_BIT_PULSE: | |
89 | if (!ev.pulse) | |
90 | break; | |
91 | ||
c216369e | 92 | data->bits <<= 1; |
3fe29c89 | 93 | if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2)) |
c216369e | 94 | data->bits |= 1; |
3fe29c89 DH |
95 | else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2)) |
96 | break; | |
97 | ||
98 | data->count++; | |
99 | data->state = STATE_BIT_SPACE; | |
100 | return 0; | |
101 | ||
102 | case STATE_BIT_SPACE: | |
103 | if (ev.pulse) | |
104 | break; | |
105 | ||
106 | if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2)) | |
107 | break; | |
108 | ||
109 | decrease_duration(&ev, SONY_BIT_SPACE); | |
110 | ||
111 | if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) { | |
112 | data->state = STATE_BIT_PULSE; | |
113 | return 0; | |
114 | } | |
115 | ||
116 | data->state = STATE_FINISHED; | |
117 | /* Fall through */ | |
118 | ||
119 | case STATE_FINISHED: | |
120 | if (ev.pulse) | |
121 | break; | |
122 | ||
123 | if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2)) | |
124 | break; | |
125 | ||
126 | switch (data->count) { | |
127 | case 12: | |
abefe12a MCC |
128 | if (!(dev->enabled_protocols & RC_BIT_SONY12)) |
129 | goto finish_state_machine; | |
130 | ||
c216369e | 131 | device = bitrev8((data->bits << 3) & 0xF8); |
3fe29c89 | 132 | subdevice = 0; |
c216369e | 133 | function = bitrev8((data->bits >> 4) & 0xFE); |
120703f9 | 134 | protocol = RC_TYPE_SONY12; |
3fe29c89 DH |
135 | break; |
136 | case 15: | |
abefe12a MCC |
137 | if (!(dev->enabled_protocols & RC_BIT_SONY15)) |
138 | goto finish_state_machine; | |
139 | ||
c216369e | 140 | device = bitrev8((data->bits >> 0) & 0xFF); |
3fe29c89 | 141 | subdevice = 0; |
ec9ee8e2 | 142 | function = bitrev8((data->bits >> 7) & 0xFE); |
120703f9 | 143 | protocol = RC_TYPE_SONY15; |
3fe29c89 DH |
144 | break; |
145 | case 20: | |
abefe12a MCC |
146 | if (!(dev->enabled_protocols & RC_BIT_SONY20)) |
147 | goto finish_state_machine; | |
148 | ||
c216369e DH |
149 | device = bitrev8((data->bits >> 5) & 0xF8); |
150 | subdevice = bitrev8((data->bits >> 0) & 0xFF); | |
151 | function = bitrev8((data->bits >> 12) & 0xFE); | |
120703f9 | 152 | protocol = RC_TYPE_SONY20; |
3fe29c89 DH |
153 | break; |
154 | default: | |
155 | IR_dprintk(1, "Sony invalid bitcount %u\n", data->count); | |
156 | goto out; | |
157 | } | |
158 | ||
159 | scancode = device << 16 | subdevice << 8 | function; | |
160 | IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode); | |
120703f9 | 161 | rc_keydown(dev, protocol, scancode, 0); |
abefe12a | 162 | goto finish_state_machine; |
3fe29c89 DH |
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; | |
abefe12a MCC |
170 | |
171 | finish_state_machine: | |
172 | data->state = STATE_INACTIVE; | |
173 | return 0; | |
3fe29c89 DH |
174 | } |
175 | ||
3fe29c89 | 176 | static struct ir_raw_handler sony_handler = { |
c003ab1b | 177 | .protocols = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20, |
3fe29c89 | 178 | .decode = ir_sony_decode, |
3fe29c89 DH |
179 | }; |
180 | ||
181 | static int __init ir_sony_decode_init(void) | |
182 | { | |
183 | ir_raw_handler_register(&sony_handler); | |
184 | ||
185 | printk(KERN_INFO "IR Sony protocol handler initialized\n"); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static void __exit ir_sony_decode_exit(void) | |
190 | { | |
191 | ir_raw_handler_unregister(&sony_handler); | |
192 | } | |
193 | ||
194 | module_init(ir_sony_decode_init); | |
195 | module_exit(ir_sony_decode_exit); | |
196 | ||
197 | MODULE_LICENSE("GPL"); | |
198 | MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); | |
199 | MODULE_DESCRIPTION("Sony IR protocol decoder"); |