]>
Commit | Line | Data |
---|---|---|
b32e7243 MCC |
1 | /* ir-sanyo-decoder.c - handle SANYO IR Pulse/Space protocol |
2 | * | |
37e59f87 | 3 | * Copyright (C) 2011 by Mauro Carvalho Chehab |
b32e7243 MCC |
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 | * This protocol uses the NEC protocol timings. However, data is formatted as: | |
15 | * 13 bits Custom Code | |
16 | * 13 bits NOT(Custom Code) | |
17 | * 8 bits Key data | |
18 | * 8 bits NOT(Key data) | |
19 | * | |
20 | * According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon | |
21 | * Information for this protocol is available at the Sanyo LC7461 datasheet. | |
22 | */ | |
23 | ||
2e962f4e | 24 | #include <linux/module.h> |
b32e7243 MCC |
25 | #include <linux/bitrev.h> |
26 | #include "rc-core-priv.h" | |
27 | ||
28 | #define SANYO_NBITS (13+13+8+8) | |
29 | #define SANYO_UNIT 562500 /* ns */ | |
30 | #define SANYO_HEADER_PULSE (16 * SANYO_UNIT) | |
31 | #define SANYO_HEADER_SPACE (8 * SANYO_UNIT) | |
32 | #define SANYO_BIT_PULSE (1 * SANYO_UNIT) | |
33 | #define SANYO_BIT_0_SPACE (1 * SANYO_UNIT) | |
34 | #define SANYO_BIT_1_SPACE (3 * SANYO_UNIT) | |
35 | #define SANYO_REPEAT_SPACE (150 * SANYO_UNIT) | |
36 | #define SANYO_TRAILER_PULSE (1 * SANYO_UNIT) | |
37 | #define SANYO_TRAILER_SPACE (10 * SANYO_UNIT) /* in fact, 42 */ | |
38 | ||
39 | enum sanyo_state { | |
40 | STATE_INACTIVE, | |
41 | STATE_HEADER_SPACE, | |
42 | STATE_BIT_PULSE, | |
43 | STATE_BIT_SPACE, | |
44 | STATE_TRAILER_PULSE, | |
45 | STATE_TRAILER_SPACE, | |
46 | }; | |
47 | ||
48 | /** | |
49 | * ir_sanyo_decode() - Decode one SANYO pulse or space | |
50 | * @dev: the struct rc_dev descriptor of the device | |
1855e988 | 51 | * @ev: the struct ir_raw_event descriptor of the pulse/space |
b32e7243 MCC |
52 | * |
53 | * This function returns -EINVAL if the pulse violates the state machine | |
54 | */ | |
55 | static int ir_sanyo_decode(struct rc_dev *dev, struct ir_raw_event ev) | |
56 | { | |
57 | struct sanyo_dec *data = &dev->raw->sanyo; | |
58 | u32 scancode; | |
2bfc04d6 SY |
59 | u16 address; |
60 | u8 command, not_command; | |
b32e7243 | 61 | |
b32e7243 MCC |
62 | if (!is_timing_event(ev)) { |
63 | if (ev.reset) { | |
64 | IR_dprintk(1, "SANYO event reset received. reset to state 0\n"); | |
65 | data->state = STATE_INACTIVE; | |
66 | } | |
67 | return 0; | |
68 | } | |
69 | ||
70 | IR_dprintk(2, "SANYO decode started at state %d (%uus %s)\n", | |
71 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
72 | ||
73 | switch (data->state) { | |
74 | ||
75 | case STATE_INACTIVE: | |
76 | if (!ev.pulse) | |
77 | break; | |
78 | ||
79 | if (eq_margin(ev.duration, SANYO_HEADER_PULSE, SANYO_UNIT / 2)) { | |
80 | data->count = 0; | |
81 | data->state = STATE_HEADER_SPACE; | |
82 | return 0; | |
83 | } | |
84 | break; | |
85 | ||
86 | ||
87 | case STATE_HEADER_SPACE: | |
88 | if (ev.pulse) | |
89 | break; | |
90 | ||
91 | if (eq_margin(ev.duration, SANYO_HEADER_SPACE, SANYO_UNIT / 2)) { | |
92 | data->state = STATE_BIT_PULSE; | |
93 | return 0; | |
94 | } | |
95 | ||
96 | break; | |
97 | ||
98 | case STATE_BIT_PULSE: | |
99 | if (!ev.pulse) | |
100 | break; | |
101 | ||
102 | if (!eq_margin(ev.duration, SANYO_BIT_PULSE, SANYO_UNIT / 2)) | |
103 | break; | |
104 | ||
105 | data->state = STATE_BIT_SPACE; | |
106 | return 0; | |
107 | ||
108 | case STATE_BIT_SPACE: | |
109 | if (ev.pulse) | |
110 | break; | |
111 | ||
112 | if (!data->count && geq_margin(ev.duration, SANYO_REPEAT_SPACE, SANYO_UNIT / 2)) { | |
265a2988 DH |
113 | rc_repeat(dev); |
114 | IR_dprintk(1, "SANYO repeat last key\n"); | |
115 | data->state = STATE_INACTIVE; | |
b32e7243 MCC |
116 | return 0; |
117 | } | |
118 | ||
119 | data->bits <<= 1; | |
120 | if (eq_margin(ev.duration, SANYO_BIT_1_SPACE, SANYO_UNIT / 2)) | |
121 | data->bits |= 1; | |
122 | else if (!eq_margin(ev.duration, SANYO_BIT_0_SPACE, SANYO_UNIT / 2)) | |
123 | break; | |
124 | data->count++; | |
125 | ||
126 | if (data->count == SANYO_NBITS) | |
127 | data->state = STATE_TRAILER_PULSE; | |
128 | else | |
129 | data->state = STATE_BIT_PULSE; | |
130 | ||
131 | return 0; | |
132 | ||
133 | case STATE_TRAILER_PULSE: | |
134 | if (!ev.pulse) | |
135 | break; | |
136 | ||
137 | if (!eq_margin(ev.duration, SANYO_TRAILER_PULSE, SANYO_UNIT / 2)) | |
138 | break; | |
139 | ||
140 | data->state = STATE_TRAILER_SPACE; | |
141 | return 0; | |
142 | ||
143 | case STATE_TRAILER_SPACE: | |
144 | if (ev.pulse) | |
145 | break; | |
146 | ||
147 | if (!geq_margin(ev.duration, SANYO_TRAILER_SPACE, SANYO_UNIT / 2)) | |
148 | break; | |
149 | ||
150 | address = bitrev16((data->bits >> 29) & 0x1fff) >> 3; | |
5becbc58 | 151 | /* not_address = bitrev16((data->bits >> 16) & 0x1fff) >> 3; */ |
b32e7243 MCC |
152 | command = bitrev8((data->bits >> 8) & 0xff); |
153 | not_command = bitrev8((data->bits >> 0) & 0xff); | |
154 | ||
155 | if ((command ^ not_command) != 0xff) { | |
156 | IR_dprintk(1, "SANYO checksum error: received 0x%08Lx\n", | |
157 | data->bits); | |
158 | data->state = STATE_INACTIVE; | |
159 | return 0; | |
160 | } | |
161 | ||
162 | scancode = address << 8 | command; | |
163 | IR_dprintk(1, "SANYO scancode: 0x%06x\n", scancode); | |
6d741bfe | 164 | rc_keydown(dev, RC_PROTO_SANYO, scancode, 0); |
b32e7243 MCC |
165 | data->state = STATE_INACTIVE; |
166 | return 0; | |
167 | } | |
168 | ||
169 | IR_dprintk(1, "SANYO decode failed at count %d state %d (%uus %s)\n", | |
170 | data->count, data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
171 | data->state = STATE_INACTIVE; | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
cb981257 SY |
175 | static const struct ir_raw_timings_pd ir_sanyo_timings = { |
176 | .header_pulse = SANYO_HEADER_PULSE, | |
177 | .header_space = SANYO_HEADER_SPACE, | |
178 | .bit_pulse = SANYO_BIT_PULSE, | |
179 | .bit_space[0] = SANYO_BIT_0_SPACE, | |
180 | .bit_space[1] = SANYO_BIT_1_SPACE, | |
181 | .trailer_pulse = SANYO_TRAILER_PULSE, | |
182 | .trailer_space = SANYO_TRAILER_SPACE, | |
183 | .msb_first = 1, | |
184 | }; | |
185 | ||
186 | /** | |
187 | * ir_sanyo_encode() - Encode a scancode as a stream of raw events | |
188 | * | |
189 | * @protocol: protocol to encode | |
190 | * @scancode: scancode to encode | |
191 | * @events: array of raw ir events to write into | |
192 | * @max: maximum size of @events | |
193 | * | |
194 | * Returns: The number of events written. | |
195 | * -ENOBUFS if there isn't enough space in the array to fit the | |
196 | * encoding. In this case all @max events will have been written. | |
197 | */ | |
6d741bfe | 198 | static int ir_sanyo_encode(enum rc_proto protocol, u32 scancode, |
cb981257 SY |
199 | struct ir_raw_event *events, unsigned int max) |
200 | { | |
201 | struct ir_raw_event *e = events; | |
202 | int ret; | |
203 | u64 raw; | |
204 | ||
205 | raw = ((u64)(bitrev16(scancode >> 8) & 0xfff8) << (8 + 8 + 13 - 3)) | | |
206 | ((u64)(bitrev16(~scancode >> 8) & 0xfff8) << (8 + 8 + 0 - 3)) | | |
207 | ((bitrev8(scancode) & 0xff) << 8) | | |
208 | (bitrev8(~scancode) & 0xff); | |
209 | ||
210 | ret = ir_raw_gen_pd(&e, max, &ir_sanyo_timings, SANYO_NBITS, raw); | |
211 | if (ret < 0) | |
212 | return ret; | |
213 | ||
214 | return e - events; | |
215 | } | |
216 | ||
b32e7243 | 217 | static struct ir_raw_handler sanyo_handler = { |
6d741bfe | 218 | .protocols = RC_PROTO_BIT_SANYO, |
b32e7243 | 219 | .decode = ir_sanyo_decode, |
cb981257 | 220 | .encode = ir_sanyo_encode, |
b32e7243 MCC |
221 | }; |
222 | ||
223 | static int __init ir_sanyo_decode_init(void) | |
224 | { | |
225 | ir_raw_handler_register(&sanyo_handler); | |
226 | ||
227 | printk(KERN_INFO "IR SANYO protocol handler initialized\n"); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static void __exit ir_sanyo_decode_exit(void) | |
232 | { | |
233 | ir_raw_handler_unregister(&sanyo_handler); | |
234 | } | |
235 | ||
236 | module_init(ir_sanyo_decode_init); | |
237 | module_exit(ir_sanyo_decode_exit); | |
238 | ||
239 | MODULE_LICENSE("GPL"); | |
37e59f87 | 240 | MODULE_AUTHOR("Mauro Carvalho Chehab"); |
b32e7243 MCC |
241 | MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); |
242 | MODULE_DESCRIPTION("SANYO IR protocol decoder"); |