1 /* ir-sony-decoder.c - handle Sony IR Pulse/Space protocol
3 * Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
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.
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.
15 #include <linux/bitrev.h>
16 #include <linux/module.h>
17 #include "rc-core-priv.h"
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 */
36 * ir_sony_decode() - Decode one Sony pulse or space
37 * @dev: the struct rc_dev descriptor of the device
38 * @ev: the struct ir_raw_event descriptor of the pulse/space
40 * This function returns -EINVAL if the pulse violates the state machine
42 static int ir_sony_decode(struct rc_dev
*dev
, struct ir_raw_event ev
)
44 struct sony_dec
*data
= &dev
->raw
->sony
;
45 enum rc_type protocol
;
47 u8 device
, subdevice
, function
;
49 if (!(dev
->enabled_protocols
&
50 (RC_BIT_SONY12
| RC_BIT_SONY15
| RC_BIT_SONY20
)))
53 if (!is_timing_event(ev
)) {
55 data
->state
= STATE_INACTIVE
;
59 if (!geq_margin(ev
.duration
, SONY_UNIT
, SONY_UNIT
/ 2))
62 IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n",
63 data
->state
, TO_US(ev
.duration
), TO_STR(ev
.pulse
));
65 switch (data
->state
) {
71 if (!eq_margin(ev
.duration
, SONY_HEADER_PULSE
, SONY_UNIT
/ 2))
75 data
->state
= STATE_HEADER_SPACE
;
78 case STATE_HEADER_SPACE
:
82 if (!eq_margin(ev
.duration
, SONY_HEADER_SPACE
, SONY_UNIT
/ 2))
85 data
->state
= STATE_BIT_PULSE
;
93 if (eq_margin(ev
.duration
, SONY_BIT_1_PULSE
, SONY_UNIT
/ 2))
95 else if (!eq_margin(ev
.duration
, SONY_BIT_0_PULSE
, SONY_UNIT
/ 2))
99 data
->state
= STATE_BIT_SPACE
;
102 case STATE_BIT_SPACE
:
106 if (!geq_margin(ev
.duration
, SONY_BIT_SPACE
, SONY_UNIT
/ 2))
109 decrease_duration(&ev
, SONY_BIT_SPACE
);
111 if (!geq_margin(ev
.duration
, SONY_UNIT
, SONY_UNIT
/ 2)) {
112 data
->state
= STATE_BIT_PULSE
;
116 data
->state
= STATE_FINISHED
;
123 if (!geq_margin(ev
.duration
, SONY_TRAILER_SPACE
, SONY_UNIT
/ 2))
126 switch (data
->count
) {
128 if (!(dev
->enabled_protocols
& RC_BIT_SONY12
)) {
129 data
->state
= STATE_INACTIVE
;
132 device
= bitrev8((data
->bits
<< 3) & 0xF8);
134 function
= bitrev8((data
->bits
>> 4) & 0xFE);
135 protocol
= RC_TYPE_SONY12
;
138 if (!(dev
->enabled_protocols
& RC_BIT_SONY15
)) {
139 data
->state
= STATE_INACTIVE
;
142 device
= bitrev8((data
->bits
>> 0) & 0xFF);
144 function
= bitrev8((data
->bits
>> 7) & 0xFE);
145 protocol
= RC_TYPE_SONY15
;
148 if (!(dev
->enabled_protocols
& RC_BIT_SONY20
)) {
149 data
->state
= STATE_INACTIVE
;
152 device
= bitrev8((data
->bits
>> 5) & 0xF8);
153 subdevice
= bitrev8((data
->bits
>> 0) & 0xFF);
154 function
= bitrev8((data
->bits
>> 12) & 0xFE);
155 protocol
= RC_TYPE_SONY20
;
158 IR_dprintk(1, "Sony invalid bitcount %u\n", data
->count
);
162 scancode
= device
<< 16 | subdevice
<< 8 | function
;
163 IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data
->count
, scancode
);
164 rc_keydown(dev
, protocol
, scancode
, 0);
165 data
->state
= STATE_INACTIVE
;
170 IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n",
171 data
->state
, TO_US(ev
.duration
), TO_STR(ev
.pulse
));
172 data
->state
= STATE_INACTIVE
;
176 static struct ir_raw_handler sony_handler
= {
177 .protocols
= RC_BIT_SONY12
| RC_BIT_SONY15
| RC_BIT_SONY20
,
178 .decode
= ir_sony_decode
,
181 static int __init
ir_sony_decode_init(void)
183 ir_raw_handler_register(&sony_handler
);
185 printk(KERN_INFO
"IR Sony protocol handler initialized\n");
189 static void __exit
ir_sony_decode_exit(void)
191 ir_raw_handler_unregister(&sony_handler
);
194 module_init(ir_sony_decode_init
);
195 module_exit(ir_sony_decode_exit
);
197 MODULE_LICENSE("GPL");
198 MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
199 MODULE_DESCRIPTION("Sony IR protocol decoder");