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path: root/drivers/media/rc/ir-sony-decoder.c
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-rw-r--r--drivers/media/rc/ir-sony-decoder.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/media/rc/ir-sony-decoder.c b/drivers/media/rc/ir-sony-decoder.c
new file mode 100644
index 000000000000..2d15730822bc
--- /dev/null
+++ b/drivers/media/rc/ir-sony-decoder.c
@@ -0,0 +1,182 @@
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>
16#include "ir-core-priv.h"
17
18#define SONY_UNIT 600000 /* ns */
19#define SONY_HEADER_PULSE (4 * SONY_UNIT)
20#define SONY_HEADER_SPACE (1 * SONY_UNIT)
21#define SONY_BIT_0_PULSE (1 * SONY_UNIT)
22#define SONY_BIT_1_PULSE (2 * SONY_UNIT)
23#define SONY_BIT_SPACE (1 * SONY_UNIT)
24#define SONY_TRAILER_SPACE (10 * SONY_UNIT) /* minimum */
25
26enum sony_state {
27 STATE_INACTIVE,
28 STATE_HEADER_SPACE,
29 STATE_BIT_PULSE,
30 STATE_BIT_SPACE,
31 STATE_FINISHED,
32};
33
34/**
35 * ir_sony_decode() - Decode one Sony pulse or space
36 * @input_dev: the struct input_dev descriptor of the device
37 * @ev: the struct ir_raw_event descriptor of the pulse/space
38 *
39 * This function returns -EINVAL if the pulse violates the state machine
40 */
41static int ir_sony_decode(struct input_dev *input_dev, struct ir_raw_event ev)
42{
43 struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
44 struct sony_dec *data = &ir_dev->raw->sony;
45 u32 scancode;
46 u8 device, subdevice, function;
47
48 if (!(ir_dev->raw->enabled_protocols & IR_TYPE_SONY))
49 return 0;
50
51 if (!is_timing_event(ev)) {
52 if (ev.reset)
53 data->state = STATE_INACTIVE;
54 return 0;
55 }
56
57 if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2))
58 goto out;
59
60 IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n",
61 data->state, TO_US(ev.duration), TO_STR(ev.pulse));
62
63 switch (data->state) {
64
65 case STATE_INACTIVE:
66 if (!ev.pulse)
67 break;
68
69 if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2))
70 break;
71
72 data->count = 0;
73 data->state = STATE_HEADER_SPACE;
74 return 0;
75
76 case STATE_HEADER_SPACE:
77 if (ev.pulse)
78 break;
79
80 if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2))
81 break;
82
83 data->state = STATE_BIT_PULSE;
84 return 0;
85
86 case STATE_BIT_PULSE:
87 if (!ev.pulse)
88 break;
89
90 data->bits <<= 1;
91 if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
92 data->bits |= 1;
93 else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2))
94 break;
95
96 data->count++;
97 data->state = STATE_BIT_SPACE;
98 return 0;
99
100 case STATE_BIT_SPACE:
101 if (ev.pulse)
102 break;
103
104 if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2))
105 break;
106
107 decrease_duration(&ev, SONY_BIT_SPACE);
108
109 if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) {
110 data->state = STATE_BIT_PULSE;
111 return 0;
112 }
113
114 data->state = STATE_FINISHED;
115 /* Fall through */
116
117 case STATE_FINISHED:
118 if (ev.pulse)
119 break;
120
121 if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2))
122 break;
123
124 switch (data->count) {
125 case 12:
126 device = bitrev8((data->bits << 3) & 0xF8);
127 subdevice = 0;
128 function = bitrev8((data->bits >> 4) & 0xFE);
129 break;
130 case 15:
131 device = bitrev8((data->bits >> 0) & 0xFF);
132 subdevice = 0;
133 function = bitrev8((data->bits >> 7) & 0xFD);
134 break;
135 case 20:
136 device = bitrev8((data->bits >> 5) & 0xF8);
137 subdevice = bitrev8((data->bits >> 0) & 0xFF);
138 function = bitrev8((data->bits >> 12) & 0xFE);
139 break;
140 default:
141 IR_dprintk(1, "Sony invalid bitcount %u\n", data->count);
142 goto out;
143 }
144
145 scancode = device << 16 | subdevice << 8 | function;
146 IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode);
147 ir_keydown(input_dev, scancode, 0);
148 data->state = STATE_INACTIVE;
149 return 0;
150 }
151
152out:
153 IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n",
154 data->state, TO_US(ev.duration), TO_STR(ev.pulse));
155 data->state = STATE_INACTIVE;
156 return -EINVAL;
157}
158
159static struct ir_raw_handler sony_handler = {
160 .protocols = IR_TYPE_SONY,
161 .decode = ir_sony_decode,
162};
163
164static int __init ir_sony_decode_init(void)
165{
166 ir_raw_handler_register(&sony_handler);
167
168 printk(KERN_INFO "IR Sony protocol handler initialized\n");
169 return 0;
170}
171
172static void __exit ir_sony_decode_exit(void)
173{
174 ir_raw_handler_unregister(&sony_handler);
175}
176
177module_init(ir_sony_decode_init);
178module_exit(ir_sony_decode_exit);
179
180MODULE_LICENSE("GPL");
181MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
182MODULE_DESCRIPTION("Sony IR protocol decoder");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-28 22:10:34 -0500