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Annotation of Gnu-Mach/chips/audio_defs.h, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1993 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /*-
        !            27:  * Copyright (c) 1991, 1992 The Regents of the University of California.
        !            28:  * All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the Computer Systems
        !            41:  *     Engineering Group at Lawrence Berkeley Laboratory.
        !            42:  * 4. The name of the Laboratory may not be used to endorse or promote 
        !            43:  *    products derived from this software without specific prior written 
        !            44:  *    permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  */
        !            58: 
        !            59: #define AUCB_SIZE 4096
        !            60: #define AUCB_MOD(k)    ((k) & (AUCB_SIZE - 1))
        !            61: 
        !            62: #define AUCB_INIT(cb)  ((cb)->cb_head = (cb)->cb_tail = (cb)->cb_drops = \
        !            63:                         (cb)->cb_pdrops = 0)
        !            64: 
        !            65: #define AUCB_EMPTY(cb) ((cb)->cb_head == (cb)->cb_tail)
        !            66: #define AUCB_FULL(cb)  (AUCB_MOD((cb)->cb_tail + 1) == (cb)->cb_head)
        !            67: #define AUCB_LEN(cb)   (AUCB_MOD((cb)->cb_tail - (cb)->cb_head))
        !            68: 
        !            69: #define MAXBLKSIZE (AUCB_SIZE / 2)
        !            70: #define DEFBLKSIZE 128
        !            71: 
        !            72: #ifndef LOCORE
        !            73: 
        !            74: /*
        !            75:  * Our own circular buffers, used if not doing DMA.
        !            76:  * [af: with some work we could use the circbuf.c code instead]
        !            77:  */
        !            78: typedef struct au_cb {
        !            79:        int     cb_head;                /* queue head */
        !            80:        int     cb_tail;                /* queue tail */
        !            81:        int     cb_thresh;              /* threshold for wakeup */
        !            82:        unsigned int    cb_waking;      /* needs wakeup at softint level */
        !            83:        unsigned int    cb_pause;       /* io paused */
        !            84:        unsigned int    cb_drops;       /* missed samples from over/underrun */
        !            85:        unsigned int    cb_pdrops;      /* sun compat -- paused samples */
        !            86:        unsigned char   cb_data[AUCB_SIZE];     /* data buffer */
        !            87: } au_cb_t;
        !            88: 
        !            89: /*
        !            90:  * Handle on a bi-directional stream of samples
        !            91:  */
        !            92: typedef struct au_io {
        !            93:        unsigned int    au_stamp;       /* time stamp */
        !            94:        int     au_lowat;               /* xmit low water mark (for wakeup) */
        !            95:        int     au_hiwat;               /* xmit high water mark (for wakeup) */
        !            96:        int     au_blksize;             /* recv block (chunk) size */
        !            97:        int     au_backlog;             /* # samples of xmit backlog to gen. */
        !            98:        struct  au_cb au_rb;            /* read (recv) buffer */
        !            99:        struct  au_cb au_wb;            /* write (xmit) buffer */
        !           100: } au_io_t;
        !           101: 
        !           102: /*
        !           103:  * Interface to specific chips
        !           104:  */
        !           105: typedef struct {
        !           106:        void    (*init)();
        !           107:        void    (*close)();
        !           108:        void    (*setport)();
        !           109:        int     (*getport)();
        !           110:        void    (*setgains)();
        !           111:        void    (*getgains)();
        !           112:        io_return_t     (*setstate)();
        !           113:        io_return_t     (*getstate)();
        !           114: } audio_switch_t;
        !           115: 
        !           116: /*
        !           117:  * Callbacks into audio module, and interface to kernel
        !           118:  */
        !           119: void           audio_attach( void *, audio_switch_t *, void **);
        !           120: boolean_t      audio_hwintr( void *, unsigned int, unsigned int *);
        !           121: 
        !           122: extern io_return_t audio_open( int, int, io_req_t );
        !           123: extern io_return_t audio_close( int );
        !           124: extern io_return_t audio_read( int, io_req_t );
        !           125: extern io_return_t audio_write( int, io_req_t );
        !           126: extern io_return_t audio_get_status( int, dev_flavor_t, dev_status_t, natural_t *);
        !           127: extern io_return_t audio_set_status( int, dev_flavor_t, dev_status_t, natural_t);
        !           128: 
        !           129: #endif

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