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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_ */