85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/* $OpenBSD: midivar.h,v 1.14 2023/09/26 19:55:24 mvs Exp $ */
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/*
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* Copyright (c) 2003, 2004 Alexandre Ratchov
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _SYS_DEV_MIDIVAR_H_
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#define _SYS_DEV_MIDIVAR_H_
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#include <dev/midi_if.h>
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#include <sys/device.h>
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#include <sys/event.h>
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#include <sys/proc.h>
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#include <sys/timeout.h>
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#define MIDI_RATE 3125 /* midi uart baud rate in bytes/second */
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/*
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* simple ring buffer
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*/
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#define MIDIBUF_SIZE (1 << 10)
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#define MIDIBUF_MASK (MIDIBUF_SIZE - 1)
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struct midi_buffer {
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struct klist klist; /* to record & wakeup poll(2) */
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int blocking; /* read/write blocking */
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unsigned char data[MIDIBUF_SIZE];
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unsigned start, used;
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};
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#define MIDIBUF_START(buf) ((buf)->start)
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#define MIDIBUF_END(buf) (((buf)->start + (buf)->used) & MIDIBUF_MASK)
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#define MIDIBUF_USED(buf) ((buf)->used)
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#define MIDIBUF_AVAIL(buf) (MIDIBUF_SIZE - (buf)->used)
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#define MIDIBUF_ISFULL(buf) ((buf)->used >= MIDIBUF_SIZE)
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#define MIDIBUF_ISEMPTY(buf) ((buf)->used == 0)
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#define MIDIBUF_WRITE(buf, byte) \
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do { \
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(buf)->data[MIDIBUF_END(buf)] = (byte); \
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(buf)->used++; \
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} while(0)
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#define MIDIBUF_READ(buf, byte) \
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do { \
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(byte) = (buf)->data[(buf)->start++]; \
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(buf)->start &= MIDIBUF_MASK; \
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(buf)->used--; \
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} while(0)
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#define MIDIBUF_REMOVE(buf, count) \
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do { \
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(buf)->start += (count); \
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(buf)->start &= MIDIBUF_MASK; \
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(buf)->used -= (count); \
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} while(0)
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#define MIDIBUF_INIT(buf) \
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do { \
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(buf)->start = (buf)->used = 0; \
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} while(0)
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struct midi_softc {
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struct device dev;
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const struct midi_hw_if *hw_if;
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void *hw_hdl;
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int isbusy; /* concerns only the output */
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int flags; /* open flags */
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int props; /* midi hw proprieties */
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struct timeout timeo;
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struct midi_buffer inbuf;
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struct midi_buffer outbuf;
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};
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#endif /* _SYS_DEV_MIDIVAR_H_ */
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