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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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