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 goto finish_state_machine;
131 device = bitrev8((data->bits << 3) & 0xF8);
133 function = bitrev8((data->bits >> 4) & 0xFE);
134 protocol = RC_TYPE_SONY12;
137 if (!(dev->enabled_protocols & RC_BIT_SONY15))
138 goto finish_state_machine;
140 device = bitrev8((data->bits >> 0) & 0xFF);
142 function = bitrev8((data->bits >> 7) & 0xFE);
143 protocol = RC_TYPE_SONY15;
146 if (!(dev->enabled_protocols & RC_BIT_SONY20))
147 goto finish_state_machine;
149 device = bitrev8((data->bits >> 5) & 0xF8);
150 subdevice = bitrev8((data->bits >> 0) & 0xFF);
151 function = bitrev8((data->bits >> 12) & 0xFE);
152 protocol = RC_TYPE_SONY20;
155 IR_dprintk(1, "Sony invalid bitcount %u\n", data->count);
159 scancode = device << 16 | subdevice << 8 | function;
160 IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode);
161 rc_keydown(dev, protocol, scancode, 0);
162 goto finish_state_machine;
166 IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n",
167 data->state, TO_US(ev.duration), TO_STR(ev.pulse));
168 data->state = STATE_INACTIVE;
171 finish_state_machine:
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");