]>
Commit | Line | Data |
---|---|---|
8e8e69d6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bf670f64 DH |
2 | /* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol |
3 | * | |
4 | * Copyright (C) 2010 by David Härdeman <david@hardeman.nu> | |
bf670f64 DH |
5 | */ |
6 | ||
7 | #include <linux/bitrev.h> | |
7a707b89 | 8 | #include <linux/module.h> |
f62de675 | 9 | #include "rc-core-priv.h" |
bf670f64 DH |
10 | |
11 | #define JVC_NBITS 16 /* dev(8) + func(8) */ | |
528222d8 | 12 | #define JVC_UNIT 525 /* us */ |
bf670f64 DH |
13 | #define JVC_HEADER_PULSE (16 * JVC_UNIT) /* lack of header -> repeat */ |
14 | #define JVC_HEADER_SPACE (8 * JVC_UNIT) | |
15 | #define JVC_BIT_PULSE (1 * JVC_UNIT) | |
16 | #define JVC_BIT_0_SPACE (1 * JVC_UNIT) | |
17 | #define JVC_BIT_1_SPACE (3 * JVC_UNIT) | |
18 | #define JVC_TRAILER_PULSE (1 * JVC_UNIT) | |
19 | #define JVC_TRAILER_SPACE (35 * JVC_UNIT) | |
20 | ||
bf670f64 DH |
21 | enum jvc_state { |
22 | STATE_INACTIVE, | |
23 | STATE_HEADER_SPACE, | |
24 | STATE_BIT_PULSE, | |
25 | STATE_BIT_SPACE, | |
26 | STATE_TRAILER_PULSE, | |
27 | STATE_TRAILER_SPACE, | |
39b2c068 | 28 | STATE_CHECK_REPEAT, |
bf670f64 DH |
29 | }; |
30 | ||
bf670f64 DH |
31 | /** |
32 | * ir_jvc_decode() - Decode one JVC pulse or space | |
d8b4b582 | 33 | * @dev: the struct rc_dev descriptor of the device |
1855e988 | 34 | * @ev: the struct ir_raw_event descriptor of the pulse/space |
bf670f64 DH |
35 | * |
36 | * This function returns -EINVAL if the pulse violates the state machine | |
37 | */ | |
d8b4b582 | 38 | static int ir_jvc_decode(struct rc_dev *dev, struct ir_raw_event ev) |
bf670f64 | 39 | { |
d8b4b582 | 40 | struct jvc_dec *data = &dev->raw->jvc; |
bf670f64 | 41 | |
4651918a ML |
42 | if (!is_timing_event(ev)) { |
43 | if (ev.reset) | |
44 | data->state = STATE_INACTIVE; | |
bf670f64 DH |
45 | return 0; |
46 | } | |
47 | ||
48 | if (!geq_margin(ev.duration, JVC_UNIT, JVC_UNIT / 2)) | |
49 | goto out; | |
50 | ||
50078a90 | 51 | dev_dbg(&dev->dev, "JVC decode started at state %d (%uus %s)\n", |
528222d8 | 52 | data->state, ev.duration, TO_STR(ev.pulse)); |
bf670f64 | 53 | |
39b2c068 | 54 | again: |
bf670f64 DH |
55 | switch (data->state) { |
56 | ||
57 | case STATE_INACTIVE: | |
58 | if (!ev.pulse) | |
59 | break; | |
60 | ||
61 | if (!eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2)) | |
62 | break; | |
63 | ||
64 | data->count = 0; | |
65 | data->first = true; | |
66 | data->toggle = !data->toggle; | |
67 | data->state = STATE_HEADER_SPACE; | |
68 | return 0; | |
69 | ||
70 | case STATE_HEADER_SPACE: | |
71 | if (ev.pulse) | |
72 | break; | |
73 | ||
74 | if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2)) | |
75 | break; | |
76 | ||
77 | data->state = STATE_BIT_PULSE; | |
78 | return 0; | |
79 | ||
80 | case STATE_BIT_PULSE: | |
81 | if (!ev.pulse) | |
82 | break; | |
83 | ||
84 | if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2)) | |
85 | break; | |
86 | ||
87 | data->state = STATE_BIT_SPACE; | |
88 | return 0; | |
89 | ||
90 | case STATE_BIT_SPACE: | |
91 | if (ev.pulse) | |
92 | break; | |
93 | ||
c216369e | 94 | data->bits <<= 1; |
bf670f64 | 95 | if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) { |
c216369e | 96 | data->bits |= 1; |
bf670f64 DH |
97 | decrease_duration(&ev, JVC_BIT_1_SPACE); |
98 | } else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2)) | |
99 | decrease_duration(&ev, JVC_BIT_0_SPACE); | |
100 | else | |
101 | break; | |
102 | data->count++; | |
103 | ||
104 | if (data->count == JVC_NBITS) | |
105 | data->state = STATE_TRAILER_PULSE; | |
106 | else | |
107 | data->state = STATE_BIT_PULSE; | |
108 | return 0; | |
109 | ||
110 | case STATE_TRAILER_PULSE: | |
111 | if (!ev.pulse) | |
112 | break; | |
113 | ||
114 | if (!eq_margin(ev.duration, JVC_TRAILER_PULSE, JVC_UNIT / 2)) | |
115 | break; | |
116 | ||
117 | data->state = STATE_TRAILER_SPACE; | |
118 | return 0; | |
119 | ||
120 | case STATE_TRAILER_SPACE: | |
121 | if (ev.pulse) | |
122 | break; | |
123 | ||
124 | if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2)) | |
125 | break; | |
126 | ||
127 | if (data->first) { | |
128 | u32 scancode; | |
c216369e DH |
129 | scancode = (bitrev8((data->bits >> 8) & 0xff) << 8) | |
130 | (bitrev8((data->bits >> 0) & 0xff) << 0); | |
50078a90 | 131 | dev_dbg(&dev->dev, "JVC scancode 0x%04x\n", scancode); |
6d741bfe | 132 | rc_keydown(dev, RC_PROTO_JVC, scancode, data->toggle); |
bf670f64 | 133 | data->first = false; |
c216369e DH |
134 | data->old_bits = data->bits; |
135 | } else if (data->bits == data->old_bits) { | |
50078a90 | 136 | dev_dbg(&dev->dev, "JVC repeat\n"); |
ca86674b | 137 | rc_repeat(dev); |
bf670f64 | 138 | } else { |
50078a90 | 139 | dev_dbg(&dev->dev, "JVC invalid repeat msg\n"); |
bf670f64 DH |
140 | break; |
141 | } | |
142 | ||
143 | data->count = 0; | |
39b2c068 | 144 | data->state = STATE_CHECK_REPEAT; |
bf670f64 | 145 | return 0; |
39b2c068 ML |
146 | |
147 | case STATE_CHECK_REPEAT: | |
148 | if (!ev.pulse) | |
149 | break; | |
150 | ||
151 | if (eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2)) | |
152 | data->state = STATE_INACTIVE; | |
153 | else | |
154 | data->state = STATE_BIT_PULSE; | |
155 | goto again; | |
bf670f64 DH |
156 | } |
157 | ||
158 | out: | |
50078a90 | 159 | dev_dbg(&dev->dev, "JVC decode failed at state %d (%uus %s)\n", |
528222d8 | 160 | data->state, ev.duration, TO_STR(ev.pulse)); |
bf670f64 DH |
161 | data->state = STATE_INACTIVE; |
162 | return -EINVAL; | |
163 | } | |
164 | ||
d8a2ae5c SY |
165 | static const struct ir_raw_timings_pd ir_jvc_timings = { |
166 | .header_pulse = JVC_HEADER_PULSE, | |
167 | .header_space = JVC_HEADER_SPACE, | |
168 | .bit_pulse = JVC_BIT_PULSE, | |
169 | .bit_space[0] = JVC_BIT_0_SPACE, | |
170 | .bit_space[1] = JVC_BIT_1_SPACE, | |
171 | .trailer_pulse = JVC_TRAILER_PULSE, | |
172 | .trailer_space = JVC_TRAILER_SPACE, | |
173 | .msb_first = 1, | |
174 | }; | |
175 | ||
176 | /** | |
177 | * ir_jvc_encode() - Encode a scancode as a stream of raw events | |
178 | * | |
179 | * @protocol: protocol to encode | |
180 | * @scancode: scancode to encode | |
181 | * @events: array of raw ir events to write into | |
182 | * @max: maximum size of @events | |
183 | * | |
184 | * Returns: The number of events written. | |
185 | * -ENOBUFS if there isn't enough space in the array to fit the | |
186 | * encoding. In this case all @max events will have been written. | |
187 | */ | |
6d741bfe | 188 | static int ir_jvc_encode(enum rc_proto protocol, u32 scancode, |
d8a2ae5c SY |
189 | struct ir_raw_event *events, unsigned int max) |
190 | { | |
191 | struct ir_raw_event *e = events; | |
192 | int ret; | |
193 | u32 raw = (bitrev8((scancode >> 8) & 0xff) << 8) | | |
194 | (bitrev8((scancode >> 0) & 0xff) << 0); | |
195 | ||
196 | ret = ir_raw_gen_pd(&e, max, &ir_jvc_timings, JVC_NBITS, raw); | |
197 | if (ret < 0) | |
198 | return ret; | |
199 | ||
200 | return e - events; | |
201 | } | |
202 | ||
bf670f64 | 203 | static struct ir_raw_handler jvc_handler = { |
6d741bfe | 204 | .protocols = RC_PROTO_BIT_JVC, |
bf670f64 | 205 | .decode = ir_jvc_decode, |
d8a2ae5c | 206 | .encode = ir_jvc_encode, |
cdfaa01c | 207 | .carrier = 38000, |
a86d6df8 | 208 | .min_timeout = JVC_TRAILER_SPACE, |
bf670f64 DH |
209 | }; |
210 | ||
211 | static int __init ir_jvc_decode_init(void) | |
212 | { | |
213 | ir_raw_handler_register(&jvc_handler); | |
214 | ||
215 | printk(KERN_INFO "IR JVC protocol handler initialized\n"); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static void __exit ir_jvc_decode_exit(void) | |
220 | { | |
221 | ir_raw_handler_unregister(&jvc_handler); | |
222 | } | |
223 | ||
224 | module_init(ir_jvc_decode_init); | |
225 | module_exit(ir_jvc_decode_exit); | |
226 | ||
227 | MODULE_LICENSE("GPL"); | |
228 | MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); | |
229 | MODULE_DESCRIPTION("JVC IR protocol decoder"); |