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/* $OpenBSD: midivar.h,v 1.15 2024/10/14 00:47:36 jsg Exp $ */
/*
* Copyright (c) 2003, 2004 Alexandre Ratchov
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _SYS_DEV_MIDIVAR_H_
#define _SYS_DEV_MIDIVAR_H_
#include <dev/midi_if.h>
#include <sys/device.h>
#include <sys/event.h>
#include <sys/timeout.h>
#define MIDI_RATE 3125 /* midi uart baud rate in bytes/second */
/*
* simple ring buffer
*/
#define MIDIBUF_SIZE (1 << 10)
#define MIDIBUF_MASK (MIDIBUF_SIZE - 1)
struct midi_buffer {
struct klist klist; /* to record & wakeup poll(2) */
int blocking; /* read/write blocking */
unsigned char data[MIDIBUF_SIZE];
unsigned start, used;
};
#define MIDIBUF_START(buf) ((buf)->start)
#define MIDIBUF_END(buf) (((buf)->start + (buf)->used) & MIDIBUF_MASK)
#define MIDIBUF_USED(buf) ((buf)->used)
#define MIDIBUF_AVAIL(buf) (MIDIBUF_SIZE - (buf)->used)
#define MIDIBUF_ISFULL(buf) ((buf)->used >= MIDIBUF_SIZE)
#define MIDIBUF_ISEMPTY(buf) ((buf)->used == 0)
#define MIDIBUF_WRITE(buf, byte) \
do { \
(buf)->data[MIDIBUF_END(buf)] = (byte); \
(buf)->used++; \
} while(0)
#define MIDIBUF_READ(buf, byte) \
do { \
(byte) = (buf)->data[(buf)->start++]; \
(buf)->start &= MIDIBUF_MASK; \
(buf)->used--; \
} while(0)
#define MIDIBUF_REMOVE(buf, count) \
do { \
(buf)->start += (count); \
(buf)->start &= MIDIBUF_MASK; \
(buf)->used -= (count); \
} while(0)
#define MIDIBUF_INIT(buf) \
do { \
(buf)->start = (buf)->used = 0; \
} while(0)
struct midi_softc {
struct device dev;
const struct midi_hw_if *hw_if;
void *hw_hdl;
int isbusy; /* concerns only the output */
int flags; /* open flags */
int props; /* midi hw proprieties */
struct timeout timeo;
struct midi_buffer inbuf;
struct midi_buffer outbuf;
};
#endif /* _SYS_DEV_MIDIVAR_H_ */
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