311 lines
6.0 KiB
C
311 lines
6.0 KiB
C
/*
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* sound/gus2_midi.c
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*
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* The low level driver for the GUS Midi Interface.
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*
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* Copyright by Hannu Savolainen 1993
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: gus_midi.c,v 1.5 1994/08/02 07:39:58 davidg Exp $
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*/
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#include "sound_config.h"
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#ifdef CONFIGURE_SOUNDCARD
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#include "gus_hw.h"
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#if !defined(EXCLUDE_GUS) && !defined(EXCLUDE_MIDI)
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static int midi_busy = 0, input_opened = 0;
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static int my_dev;
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static int output_used = 0;
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static volatile unsigned char gus_midi_control;
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static void (*midi_input_intr) (int dev, unsigned char data);
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static unsigned char tmp_queue[256];
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static volatile int qlen;
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static volatile unsigned char qhead, qtail;
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extern int gus_base, gus_irq, gus_dma;
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#define GUS_MIDI_STATUS() INB(u_MidiStatus)
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static int
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gus_midi_open (int dev, int mode,
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void (*input) (int dev, unsigned char data),
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void (*output) (int dev)
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)
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{
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if (midi_busy)
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{
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printk ("GUS: Midi busy\n");
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return RET_ERROR (EBUSY);
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}
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OUTB (MIDI_RESET, u_MidiControl);
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gus_delay ();
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gus_midi_control = 0;
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input_opened = 0;
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if (mode == OPEN_READ || mode == OPEN_READWRITE)
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{
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gus_midi_control |= MIDI_ENABLE_RCV;
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input_opened = 1;
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}
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if (mode == OPEN_WRITE || mode == OPEN_READWRITE)
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{
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gus_midi_control |= MIDI_ENABLE_XMIT;
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}
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OUTB (gus_midi_control, u_MidiControl); /*
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* Enable
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*/
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midi_busy = 1;
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qlen = qhead = qtail = output_used = 0;
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midi_input_intr = input;
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return 0;
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}
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static int
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dump_to_midi (unsigned char midi_byte)
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{
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unsigned long flags;
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int ok = 0;
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output_used = 1;
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DISABLE_INTR (flags);
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if (GUS_MIDI_STATUS () & MIDI_XMIT_EMPTY)
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{
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ok = 1;
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OUTB (midi_byte, u_MidiData);
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}
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else
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{
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/*
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* Enable Midi xmit interrupts (again)
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*/
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gus_midi_control |= MIDI_ENABLE_XMIT;
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OUTB (gus_midi_control, u_MidiControl);
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}
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RESTORE_INTR (flags);
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return ok;
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}
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static void
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gus_midi_close (int dev)
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{
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/*
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* Reset FIFO pointers, disable intrs
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*/
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OUTB (MIDI_RESET, u_MidiControl);
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midi_busy = 0;
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}
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static int
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gus_midi_out (int dev, unsigned char midi_byte)
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{
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unsigned long flags;
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/*
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* Drain the local queue first
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*/
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DISABLE_INTR (flags);
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while (qlen && dump_to_midi (tmp_queue[qhead]))
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{
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qlen--;
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qhead++;
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}
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RESTORE_INTR (flags);
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/*
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* Output the byte if the local queue is empty.
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*/
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if (!qlen)
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if (dump_to_midi (midi_byte))
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return 1; /*
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* OK
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*/
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/*
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* Put to the local queue
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*/
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if (qlen >= 256)
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return 0; /*
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* Local queue full
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*/
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DISABLE_INTR (flags);
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tmp_queue[qtail] = midi_byte;
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qlen++;
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qtail++;
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RESTORE_INTR (flags);
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return 1;
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}
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static int
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gus_midi_start_read (int dev)
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{
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return 0;
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}
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static int
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gus_midi_end_read (int dev)
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{
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return 0;
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}
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static int
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gus_midi_ioctl (int dev, unsigned cmd, unsigned arg)
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{
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return RET_ERROR (EINVAL);
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}
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static void
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gus_midi_kick (int dev)
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{
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}
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static int
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gus_midi_buffer_status (int dev)
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{
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unsigned long flags;
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if (!output_used)
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return 0;
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DISABLE_INTR (flags);
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if (qlen && dump_to_midi (tmp_queue[qhead]))
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{
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qlen--;
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qhead++;
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}
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RESTORE_INTR (flags);
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return (qlen > 0) | !(GUS_MIDI_STATUS () & MIDI_XMIT_EMPTY);
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}
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#define MIDI_SYNTH_NAME "Gravis Ultrasound Midi"
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#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
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#include "midi_synth.h"
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static struct midi_operations gus_midi_operations =
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{
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{"Gravis UltraSound Midi", 0, 0, SNDCARD_GUS},
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&std_midi_synth,
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gus_midi_open,
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gus_midi_close,
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gus_midi_ioctl,
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gus_midi_out,
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gus_midi_start_read,
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gus_midi_end_read,
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gus_midi_kick,
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NULL, /*
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* command
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*/
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gus_midi_buffer_status,
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NULL
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};
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long
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gus_midi_init (long mem_start)
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{
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if (num_midis >= MAX_MIDI_DEV)
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{
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printk ("Sound: Too many midi devices detected\n");
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return mem_start;
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}
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OUTB (MIDI_RESET, u_MidiControl);
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std_midi_synth.midi_dev = my_dev = num_midis;
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midi_devs[num_midis++] = &gus_midi_operations;
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return mem_start;
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}
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void
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gus_midi_interrupt (int dummy)
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{
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unsigned char stat, data;
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unsigned long flags;
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DISABLE_INTR (flags);
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stat = GUS_MIDI_STATUS ();
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if (stat & MIDI_RCV_FULL)
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{
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data = INB (u_MidiData);
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if (input_opened)
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midi_input_intr (my_dev, data);
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}
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if (stat & MIDI_XMIT_EMPTY)
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{
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while (qlen && dump_to_midi (tmp_queue[qhead]))
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{
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qlen--;
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qhead++;
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}
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if (!qlen)
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{
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/*
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* Disable Midi output interrupts, since no data in the buffer
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*/
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gus_midi_control &= ~MIDI_ENABLE_XMIT;
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OUTB (gus_midi_control, u_MidiControl);
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}
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}
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if (stat & MIDI_FRAME_ERR)
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printk ("Midi framing error\n");
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if (stat & MIDI_OVERRUN && input_opened)
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printk ("GUS: Midi input overrun\n");
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RESTORE_INTR (flags);
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}
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#endif
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#endif
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