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bf670f64 DH |
1 | /* ir-jvc-decoder.c - handle JVC 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> | |
16 | #include "ir-core-priv.h" | |
17 | ||
18 | #define JVC_NBITS 16 /* dev(8) + func(8) */ | |
19 | #define JVC_UNIT 525000 /* ns */ | |
20 | #define JVC_HEADER_PULSE (16 * JVC_UNIT) /* lack of header -> repeat */ | |
21 | #define JVC_HEADER_SPACE (8 * JVC_UNIT) | |
22 | #define JVC_BIT_PULSE (1 * JVC_UNIT) | |
23 | #define JVC_BIT_0_SPACE (1 * JVC_UNIT) | |
24 | #define JVC_BIT_1_SPACE (3 * JVC_UNIT) | |
25 | #define JVC_TRAILER_PULSE (1 * JVC_UNIT) | |
26 | #define JVC_TRAILER_SPACE (35 * JVC_UNIT) | |
27 | ||
bf670f64 DH |
28 | enum jvc_state { |
29 | STATE_INACTIVE, | |
30 | STATE_HEADER_SPACE, | |
31 | STATE_BIT_PULSE, | |
32 | STATE_BIT_SPACE, | |
33 | STATE_TRAILER_PULSE, | |
34 | STATE_TRAILER_SPACE, | |
39b2c068 | 35 | STATE_CHECK_REPEAT, |
bf670f64 DH |
36 | }; |
37 | ||
bf670f64 DH |
38 | /** |
39 | * ir_jvc_decode() - Decode one JVC pulse or space | |
40 | * @input_dev: the struct input_dev descriptor of the device | |
41 | * @duration: the struct ir_raw_event descriptor of the pulse/space | |
42 | * | |
43 | * This function returns -EINVAL if the pulse violates the state machine | |
44 | */ | |
45 | static int ir_jvc_decode(struct input_dev *input_dev, struct ir_raw_event ev) | |
46 | { | |
bf670f64 | 47 | struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); |
c216369e | 48 | struct jvc_dec *data = &ir_dev->raw->jvc; |
bf670f64 | 49 | |
667c9ebe | 50 | if (!(ir_dev->raw->enabled_protocols & IR_TYPE_JVC)) |
bf670f64 DH |
51 | return 0; |
52 | ||
4651918a ML |
53 | if (!is_timing_event(ev)) { |
54 | if (ev.reset) | |
55 | data->state = STATE_INACTIVE; | |
bf670f64 DH |
56 | return 0; |
57 | } | |
58 | ||
59 | if (!geq_margin(ev.duration, JVC_UNIT, JVC_UNIT / 2)) | |
60 | goto out; | |
61 | ||
62 | IR_dprintk(2, "JVC decode started at state %d (%uus %s)\n", | |
63 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
64 | ||
39b2c068 | 65 | again: |
bf670f64 DH |
66 | switch (data->state) { |
67 | ||
68 | case STATE_INACTIVE: | |
69 | if (!ev.pulse) | |
70 | break; | |
71 | ||
72 | if (!eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2)) | |
73 | break; | |
74 | ||
75 | data->count = 0; | |
76 | data->first = true; | |
77 | data->toggle = !data->toggle; | |
78 | data->state = STATE_HEADER_SPACE; | |
79 | return 0; | |
80 | ||
81 | case STATE_HEADER_SPACE: | |
82 | if (ev.pulse) | |
83 | break; | |
84 | ||
85 | if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2)) | |
86 | break; | |
87 | ||
88 | data->state = STATE_BIT_PULSE; | |
89 | return 0; | |
90 | ||
91 | case STATE_BIT_PULSE: | |
92 | if (!ev.pulse) | |
93 | break; | |
94 | ||
95 | if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2)) | |
96 | break; | |
97 | ||
98 | data->state = STATE_BIT_SPACE; | |
99 | return 0; | |
100 | ||
101 | case STATE_BIT_SPACE: | |
102 | if (ev.pulse) | |
103 | break; | |
104 | ||
c216369e | 105 | data->bits <<= 1; |
bf670f64 | 106 | if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) { |
c216369e | 107 | data->bits |= 1; |
bf670f64 DH |
108 | decrease_duration(&ev, JVC_BIT_1_SPACE); |
109 | } else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2)) | |
110 | decrease_duration(&ev, JVC_BIT_0_SPACE); | |
111 | else | |
112 | break; | |
113 | data->count++; | |
114 | ||
115 | if (data->count == JVC_NBITS) | |
116 | data->state = STATE_TRAILER_PULSE; | |
117 | else | |
118 | data->state = STATE_BIT_PULSE; | |
119 | return 0; | |
120 | ||
121 | case STATE_TRAILER_PULSE: | |
122 | if (!ev.pulse) | |
123 | break; | |
124 | ||
125 | if (!eq_margin(ev.duration, JVC_TRAILER_PULSE, JVC_UNIT / 2)) | |
126 | break; | |
127 | ||
128 | data->state = STATE_TRAILER_SPACE; | |
129 | return 0; | |
130 | ||
131 | case STATE_TRAILER_SPACE: | |
132 | if (ev.pulse) | |
133 | break; | |
134 | ||
135 | if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2)) | |
136 | break; | |
137 | ||
138 | if (data->first) { | |
139 | u32 scancode; | |
c216369e DH |
140 | scancode = (bitrev8((data->bits >> 8) & 0xff) << 8) | |
141 | (bitrev8((data->bits >> 0) & 0xff) << 0); | |
bf670f64 DH |
142 | IR_dprintk(1, "JVC scancode 0x%04x\n", scancode); |
143 | ir_keydown(input_dev, scancode, data->toggle); | |
144 | data->first = false; | |
c216369e DH |
145 | data->old_bits = data->bits; |
146 | } else if (data->bits == data->old_bits) { | |
bf670f64 DH |
147 | IR_dprintk(1, "JVC repeat\n"); |
148 | ir_repeat(input_dev); | |
149 | } else { | |
150 | IR_dprintk(1, "JVC invalid repeat msg\n"); | |
151 | break; | |
152 | } | |
153 | ||
154 | data->count = 0; | |
39b2c068 | 155 | data->state = STATE_CHECK_REPEAT; |
bf670f64 | 156 | return 0; |
39b2c068 ML |
157 | |
158 | case STATE_CHECK_REPEAT: | |
159 | if (!ev.pulse) | |
160 | break; | |
161 | ||
162 | if (eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2)) | |
163 | data->state = STATE_INACTIVE; | |
164 | else | |
165 | data->state = STATE_BIT_PULSE; | |
166 | goto again; | |
bf670f64 DH |
167 | } |
168 | ||
169 | out: | |
170 | IR_dprintk(1, "JVC decode failed at state %d (%uus %s)\n", | |
171 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
172 | data->state = STATE_INACTIVE; | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
bf670f64 | 176 | static struct ir_raw_handler jvc_handler = { |
667c9ebe | 177 | .protocols = IR_TYPE_JVC, |
bf670f64 | 178 | .decode = ir_jvc_decode, |
bf670f64 DH |
179 | }; |
180 | ||
181 | static int __init ir_jvc_decode_init(void) | |
182 | { | |
183 | ir_raw_handler_register(&jvc_handler); | |
184 | ||
185 | printk(KERN_INFO "IR JVC protocol handler initialized\n"); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static void __exit ir_jvc_decode_exit(void) | |
190 | { | |
191 | ir_raw_handler_unregister(&jvc_handler); | |
192 | } | |
193 | ||
194 | module_init(ir_jvc_decode_init); | |
195 | module_exit(ir_jvc_decode_exit); | |
196 | ||
197 | MODULE_LICENSE("GPL"); | |
198 | MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); | |
199 | MODULE_DESCRIPTION("JVC IR protocol decoder"); |