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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 | ||
4651918a ML |
49 | if (!is_timing_event(ev)) { |
50 | if (ev.reset) | |
51 | data->state = STATE_INACTIVE; | |
3fe29c89 DH |
52 | return 0; |
53 | } | |
54 | ||
55 | if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) | |
56 | goto out; | |
57 | ||
58 | IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n", | |
59 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
60 | ||
61 | switch (data->state) { | |
62 | ||
63 | case STATE_INACTIVE: | |
64 | if (!ev.pulse) | |
65 | break; | |
66 | ||
67 | if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2)) | |
68 | break; | |
69 | ||
70 | data->count = 0; | |
71 | data->state = STATE_HEADER_SPACE; | |
72 | return 0; | |
73 | ||
74 | case STATE_HEADER_SPACE: | |
75 | if (ev.pulse) | |
76 | break; | |
77 | ||
78 | if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2)) | |
79 | break; | |
80 | ||
81 | data->state = STATE_BIT_PULSE; | |
82 | return 0; | |
83 | ||
84 | case STATE_BIT_PULSE: | |
85 | if (!ev.pulse) | |
86 | break; | |
87 | ||
c216369e | 88 | data->bits <<= 1; |
3fe29c89 | 89 | if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2)) |
c216369e | 90 | data->bits |= 1; |
3fe29c89 DH |
91 | else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2)) |
92 | break; | |
93 | ||
94 | data->count++; | |
95 | data->state = STATE_BIT_SPACE; | |
96 | return 0; | |
97 | ||
98 | case STATE_BIT_SPACE: | |
99 | if (ev.pulse) | |
100 | break; | |
101 | ||
102 | if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2)) | |
103 | break; | |
104 | ||
105 | decrease_duration(&ev, SONY_BIT_SPACE); | |
106 | ||
107 | if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) { | |
108 | data->state = STATE_BIT_PULSE; | |
109 | return 0; | |
110 | } | |
111 | ||
112 | data->state = STATE_FINISHED; | |
113 | /* Fall through */ | |
114 | ||
115 | case STATE_FINISHED: | |
116 | if (ev.pulse) | |
117 | break; | |
118 | ||
119 | if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2)) | |
120 | break; | |
121 | ||
122 | switch (data->count) { | |
123 | case 12: | |
abefe12a MCC |
124 | if (!(dev->enabled_protocols & RC_BIT_SONY12)) |
125 | goto finish_state_machine; | |
126 | ||
c216369e | 127 | device = bitrev8((data->bits << 3) & 0xF8); |
3fe29c89 | 128 | subdevice = 0; |
c216369e | 129 | function = bitrev8((data->bits >> 4) & 0xFE); |
120703f9 | 130 | protocol = RC_TYPE_SONY12; |
3fe29c89 DH |
131 | break; |
132 | case 15: | |
abefe12a MCC |
133 | if (!(dev->enabled_protocols & RC_BIT_SONY15)) |
134 | goto finish_state_machine; | |
135 | ||
c216369e | 136 | device = bitrev8((data->bits >> 0) & 0xFF); |
3fe29c89 | 137 | subdevice = 0; |
ec9ee8e2 | 138 | function = bitrev8((data->bits >> 7) & 0xFE); |
120703f9 | 139 | protocol = RC_TYPE_SONY15; |
3fe29c89 DH |
140 | break; |
141 | case 20: | |
abefe12a MCC |
142 | if (!(dev->enabled_protocols & RC_BIT_SONY20)) |
143 | goto finish_state_machine; | |
144 | ||
c216369e DH |
145 | device = bitrev8((data->bits >> 5) & 0xF8); |
146 | subdevice = bitrev8((data->bits >> 0) & 0xFF); | |
147 | function = bitrev8((data->bits >> 12) & 0xFE); | |
120703f9 | 148 | protocol = RC_TYPE_SONY20; |
3fe29c89 DH |
149 | break; |
150 | default: | |
151 | IR_dprintk(1, "Sony invalid bitcount %u\n", data->count); | |
152 | goto out; | |
153 | } | |
154 | ||
155 | scancode = device << 16 | subdevice << 8 | function; | |
156 | IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode); | |
120703f9 | 157 | rc_keydown(dev, protocol, scancode, 0); |
abefe12a | 158 | goto finish_state_machine; |
3fe29c89 DH |
159 | } |
160 | ||
161 | out: | |
162 | IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n", | |
163 | data->state, TO_US(ev.duration), TO_STR(ev.pulse)); | |
164 | data->state = STATE_INACTIVE; | |
165 | return -EINVAL; | |
abefe12a MCC |
166 | |
167 | finish_state_machine: | |
168 | data->state = STATE_INACTIVE; | |
169 | return 0; | |
3fe29c89 DH |
170 | } |
171 | ||
3fe29c89 | 172 | static struct ir_raw_handler sony_handler = { |
c003ab1b | 173 | .protocols = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20, |
3fe29c89 | 174 | .decode = ir_sony_decode, |
3fe29c89 DH |
175 | }; |
176 | ||
177 | static int __init ir_sony_decode_init(void) | |
178 | { | |
179 | ir_raw_handler_register(&sony_handler); | |
180 | ||
181 | printk(KERN_INFO "IR Sony protocol handler initialized\n"); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static void __exit ir_sony_decode_exit(void) | |
186 | { | |
187 | ir_raw_handler_unregister(&sony_handler); | |
188 | } | |
189 | ||
190 | module_init(ir_sony_decode_init); | |
191 | module_exit(ir_sony_decode_exit); | |
192 | ||
193 | MODULE_LICENSE("GPL"); | |
194 | MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); | |
195 | MODULE_DESCRIPTION("Sony IR protocol decoder"); |