FreeBSD/Linux Kernel Cross Reference
sys/dev/midi_if.h
1 /* $NetBSD: midi_if.h,v 1.27 2015/03/01 00:34:14 mrg Exp $ */
2
3 /*
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Lennart Augustsson (augustss@NetBSD.org).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifndef _SYS_DEV_MIDI_IF_H_
33 #define _SYS_DEV_MIDI_IF_H_
34
35 #include <sys/mutex.h>
36
37 struct midi_info {
38 const char *name; /* Name of MIDI hardware */
39 int props;
40 };
41 #define MIDI_PROP_OUT_INTR 1
42 #define MIDI_PROP_CAN_INPUT 2
43 #define MIDI_PROP_NO_OUTPUT 4
44
45 /*
46 * XXX expand
47 *
48 * List of hardware interface methods, and when locks are held by each
49 * called by this module:
50 *
51 * METHOD INTR NOTES
52 * ----------------------- ------- -------------------------
53 * open -
54 * close -
55 * output -
56 * getinfo - Called at attach time
57 * ioctl -
58 * get_locks - Called at attach time
59 */
60
61 struct midi_softc;
62
63 struct midi_hw_if {
64 int (*open)(void *, int, /* open hardware */
65 void (*)(void *, int), /* input callback */
66 void (*)(void *), /* output callback */
67 void *);
68 void (*close)(void *); /* close hardware */
69 int (*output)(void *, int); /* output a byte */
70 void (*getinfo)(void *, struct midi_info *);
71 int (*ioctl)(void *, u_long, void *, int, struct lwp *);
72 void (*get_locks)(void *, kmutex_t **, kmutex_t **);
73 };
74
75 /*
76 * The extended hardware interface is for use by drivers that are better off
77 * getting messages whole to transmit, rather than byte-by-byte through
78 * output(). Two examples are midisyn (which interprets MIDI messages in
79 * software to drive synth chips) and umidi (which has to send messages in the
80 * packet-based USB MIDI protocol). It is silly for them to have to reassemble
81 * messages midi had to split up to poke through the single-byte interface.
82 *
83 * To register use of the extended interface, a driver will call back midi's
84 * midi_register_hw_if_ext() function during getinfo(); thereafter midi will
85 * deliver channel messages, system common messages other than sysex, and sysex
86 * messages, respectively, through these methods, and use the original output
87 * method only for system realtime messages (all of which are single byte).
88 * Other drivers that have no reason to change from the single-byte interface
89 * simply don't call the register function, and nothing changes for them.
90 *
91 * IMPORTANT: any code that provides a midi_hw_if_ext struct MUST initialize
92 * its members BY NAME (typically with a C99-style initializer with designators)
93 * and assure that any unused members contain zeroes (which is what C99
94 * initializers will do), and make no assumptions about the size or order of
95 * the struct, to allow for further extension of this interface as needed.
96 */
97 struct midi_hw_if_ext {
98 int (*channel)(void *, int, int, u_char *, int);
99 int (*common)(void *, int, u_char *, int);
100 int (*sysex)(void *, u_char *, int);
101 int compress:1; /* if hw wants channel msgs in compressed form */
102 };
103 void midi_register_hw_if_ext(struct midi_hw_if_ext *);
104
105 void midi_attach(struct midi_softc *);
106 int mididetach(device_t, int);
107 device_t midi_attach_mi(const struct midi_hw_if *, void *, device_t);
108
109 int midi_unit_count(void);
110 void midi_getinfo(dev_t, struct midi_info *);
111 int midi_writebytes(int, u_char *, int);
112
113 #if !defined(IPL_AUDIO)
114 #define splaudio splbio /* XXX */
115 #define IPL_AUDIO IPL_BIO /* XXX */
116 #endif
117
118 #endif /* _SYS_DEV_MIDI_IF_H_ */
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