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Annotation of sys/dev/ic/pt2254a.h, Revision 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_ */