106 lines
1.7 KiB
C
106 lines
1.7 KiB
C
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/*
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* linux/kernel/chr_drv/sound/midibuf.c
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*
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* Device file manager for /dev/midi
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*
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* NOTE! This part of the driver is currently just a stub.
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*
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* (C) 1992 Hannu Savolainen (hsavolai@cs.helsinki.fi) See COPYING for further
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* details. Should be distributed with this file.
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*
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* Based on the Midi driver for bsd386 by Mike Durian.
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*/
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#include "sound_config.h"
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#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_MPU401)
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#if 0
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#include "midiioctl.h"
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#include "midivar.h"
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#endif
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static int midibuf_busy = 0;
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int
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MIDIbuf_open (int dev, struct fileinfo *file)
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{
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int mode, err;
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dev = dev >> 4;
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mode = file->mode & O_ACCMODE;
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if (midibuf_busy)
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return RET_ERROR (EBUSY);
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if (!mpu401_dev)
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{
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printk ("Midi: MPU-401 compatible Midi interface not present\n");
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return RET_ERROR (ENXIO);
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}
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if ((err = midi_devs[mpu401_dev]->open (mpu401_dev, mode)) < 0)
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return err;
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midibuf_busy = 1;
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return RET_ERROR (ENXIO);
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}
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void
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MIDIbuf_release (int dev, struct fileinfo *file)
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{
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int mode;
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dev = dev >> 4;
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mode = file->mode & O_ACCMODE;
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midi_devs[mpu401_dev]->close (mpu401_dev);
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midibuf_busy = 0;
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}
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int
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MIDIbuf_write (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
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{
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dev = dev >> 4;
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return count;
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}
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int
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MIDIbuf_read (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
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{
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dev = dev >> 4;
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return RET_ERROR (EIO);
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}
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int
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MIDIbuf_ioctl (int dev, struct fileinfo *file,
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unsigned int cmd, unsigned int arg)
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{
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dev = dev >> 4;
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switch (cmd)
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{
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default:
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return midi_devs[0]->ioctl (dev, cmd, arg);
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}
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}
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void
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MIDIbuf_bytes_received (int dev, unsigned char *buf, int count)
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{
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}
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long
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MIDIbuf_init (long mem_start)
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{
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return mem_start;
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}
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#endif
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