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/*
* 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.
*/
/*-
* 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.
*/
#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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