ae28ee13b4
Amancio. There is some SoundSource support here that is primitive and probably doesn't work, but I'll let the two submitters let me know how my integration of that was since I don't have this card to test. I've only tested this on my GUS MAX since it's all I have. This all probably needs to be re-done anyway since we're widely variant from the original VOXWARE source in the current layout. Submitted by: Amancio Hasty and Jim Lowe Obtained from: Hannu Savolainen
313 lines
6.0 KiB
C
313 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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*/
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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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{0},
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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 0
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if (stat & MIDI_FRAME_ERR)
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printk ("GUS: 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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#endif
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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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