Annotation of sys/dev/ic/pt2254a.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: pt2254a.h,v 1.1 2002/04/25 04:56:59 mickey Exp $ */
2: /*
3: * Copyright (c) 2002 Vladimir Popov <jumbo@narod.ru>.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
25: /*
26: * Princeton Technology Corp.'s Electronic Volume Controller IC PT2254A
27: * http://www.princeton.com.tw
28: *
29: * PT2254A is an electronic volume controller IC utilizing CMOS Technology
30: * specially designed for use in audio equipment. It has two built-in
31: * channels making it highly suitable for mono and stereo sound applications.
32: * Through the specially designated signals that are applied externally to
33: * the data, clock and strobe input pins, PT2254A can control attenuation
34: * and channel balance.
35: */
36:
37: #ifndef _PT2254A_H_
38: #define _PT2254A_H_
39:
40: #define PT2254A_MAX_ATTENUATION 68
41: #define PT2254A_ATTENUATION_STEPS 35
42:
43: #define PT2254A_REGISTER_LENGTH 18
44:
45: #define PT2254A_ATTENUATION_MAJOR_0dB (1 << 0)
46: #define PT2254A_ATTENUATION_MAJOR_10dB (1 << 1)
47: #define PT2254A_ATTENUATION_MAJOR_20dB (1 << 2)
48: #define PT2254A_ATTENUATION_MAJOR_30dB (1 << 3)
49: #define PT2254A_ATTENUATION_MAJOR_40dB (1 << 4)
50: #define PT2254A_ATTENUATION_MAJOR_50dB (1 << 5)
51: #define PT2254A_ATTENUATION_MAJOR_60dB (1 << 6)
52: #define PT2254A_ATTENUATION_MAJOR(x) (1 << x)
53:
54: #define PT2254A_ATTENUATION_MINOR_0dB (1 << 7)
55: #define PT2254A_ATTENUATION_MINOR_2dB (1 << 8
56: #define PT2254A_ATTENUATION_MINOR_4dB (1 << 9)
57: #define PT2254A_ATTENUATION_MINOR_6dB (1 << 10)
58: #define PT2254A_ATTENUATION_MINOR_8dB (1 << 11)
59: #define PT2254A_ATTENUATION_MINOR(x) (1 << (7 + x / 2))
60:
61: #define PT2254A_EMPTY_BIT (0 << 12)
62:
63: #define PT2254A_BOTH_CHANNELS (3 << 13)
64: #define PT2254A_LEFT_CHANNEL (1 << 13)
65: #define PT2254A_RIGHT_CHANNEL (1 << 14)
66:
67: #define PT2254A_ZERO_PADDING (0 << 15)
68:
69: #define USE_CHANNEL 1
70:
71: u_int32_t pt2254a_encode_volume(u_int8_t *, u_int8_t);
72: u_int32_t pt2254a_compose_register(u_int32_t, u_int32_t, int, int);
73:
74: #endif /* _PT2254A_H_ */
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