FreeBSD/Linux Kernel Cross Reference
sys/chips/audio_defs.h

     /* 
      * Mach Operating System
      * Copyright (c) 1993 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        audio_defs.h,v $
     * Revision 2.2  93/03/18  10:37:04  mrt
     *      Started, from Berkeley's driver.
     *      [93/03/09            af]
     * 
    /*-
     * Copyright (c) 1991, 1992 The Regents of the University of California.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the Computer Systems
     *      Engineering Group at Lawrence Berkeley Laboratory.
     * 4. The name of the Laboratory may not be used to endorse or promote 
     *    products derived from this software without specific prior written 
     *    permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $Header: audio_defs.h,v 2.2 93/03/18 10:37:04 mrt Exp $ (LBL)
     */
    
    #define AUCB_SIZE 4096
    #define AUCB_MOD(k)     ((k) & (AUCB_SIZE - 1))
    
    #define AUCB_INIT(cb)   ((cb)->cb_head = (cb)->cb_tail = (cb)->cb_drops = \
                             (cb)->cb_pdrops = 0)
    
    #define AUCB_EMPTY(cb)  ((cb)->cb_head == (cb)->cb_tail)
    #define AUCB_FULL(cb)   (AUCB_MOD((cb)->cb_tail + 1) == (cb)->cb_head)
    #define AUCB_LEN(cb)    (AUCB_MOD((cb)->cb_tail - (cb)->cb_head))
    
    #define MAXBLKSIZE (AUCB_SIZE / 2)
    #define DEFBLKSIZE 128
    
    #ifndef LOCORE
    
    /*
     * Our own circular buffers, used if not doing DMA.
     * [af: with some work we could use the circbuf.c code instead]
     */
    typedef struct au_cb {
            int     cb_head;                /* queue head */
            int     cb_tail;                /* queue tail */
            int     cb_thresh;              /* threshold for wakeup */
            unsigned int    cb_waking;      /* needs wakeup at softint level */
            unsigned int    cb_pause;       /* io paused */
            unsigned int    cb_drops;       /* missed samples from over/underrun */
            unsigned int    cb_pdrops;      /* sun compat -- paused samples */
            unsigned char   cb_data[AUCB_SIZE];     /* data buffer */
    } au_cb_t;
    
    /*
     * Handle on a bi-directional stream of samples
    */
   typedef struct au_io {
           unsigned int    au_stamp;       /* time stamp */
           int     au_lowat;               /* xmit low water mark (for wakeup) */
           int     au_hiwat;               /* xmit high water mark (for wakeup) */
           int     au_blksize;             /* recv block (chunk) size */
           int     au_backlog;             /* # samples of xmit backlog to gen. */
           struct  au_cb au_rb;            /* read (recv) buffer */
           struct  au_cb au_wb;            /* write (xmit) buffer */
   } au_io_t;
   
   /*
    * Interface to specific chips
    */
   typedef struct {
           void    (*init)();
           void    (*close)();
           void    (*setport)();
           int     (*getport)();
           void    (*setgains)();
           void    (*getgains)();
           io_return_t     (*setstate)();
           io_return_t     (*getstate)();
   } audio_switch_t;
   
   /*
    * Callbacks into audio module, and interface to kernel
    */
   void            audio_attach( void *, audio_switch_t *, void **);
   boolean_t       audio_hwintr( void *, unsigned int, unsigned int *);
   
   extern io_return_t audio_open( int, int, io_req_t );
   extern io_return_t audio_close( int );
   extern io_return_t audio_read( int, io_req_t );
   extern io_return_t audio_write( int, io_req_t );
   extern io_return_t audio_get_status( int, dev_flavor_t, dev_status_t, natural_t *);
   extern io_return_t audio_set_status( int, dev_flavor_t, dev_status_t, natural_t);
   
   #endif

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