freebsd-skq/sys/i386/isa/sound/gus_midi.c
peter d713c6aca4 Part 2 of pcvt/voxware revival. I hope I have not clobbered any other
deltas, but it is possible since I had a few merge conflicts over the last
few days while this has been sitting ready to go.

(Part 1 was committed to the config files, but cvs aborted grrr..)

Approved by:    core
1999-01-01 08:18:13 +00:00

275 lines
5.4 KiB
C

/*
* sound/gus2_midi.c
*
* The low level driver for the GUS Midi Interface.
*
* Copyright by Hannu Savolainen 1993
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer. 2.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <i386/isa/sound/sound_config.h>
#if defined(CONFIG_GUS) && defined(CONFIG_MIDI)
#include <i386/isa/sound/gus_hw.h>
static int midi_busy = 0, input_opened = 0;
static int my_dev;
static int output_used = 0;
static volatile unsigned char gus_midi_control;
static void (*midi_input_intr) (int dev, unsigned char data);
static unsigned char tmp_queue[256];
static volatile int qlen;
static volatile unsigned char qhead, qtail;
extern int gus_base, gus_irq, gus_dma;
extern sound_os_info *gus_osp;
#define GUS_MIDI_STATUS() inb( u_MidiStatus)
static int
gus_midi_open(int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
if (midi_busy) {
printf("GUS: Midi busy\n");
return -(EBUSY);
}
outb(u_MidiControl, MIDI_RESET);
gus_delay();
gus_midi_control = 0;
input_opened = 0;
if (mode == OPEN_READ || mode == OPEN_READWRITE) {
gus_midi_control |= MIDI_ENABLE_RCV;
input_opened = 1;
}
if (mode == OPEN_WRITE || mode == OPEN_READWRITE) {
gus_midi_control |= MIDI_ENABLE_XMIT;
}
outb(u_MidiControl, gus_midi_control); /* Enable */
midi_busy = 1;
qlen = qhead = qtail = output_used = 0;
midi_input_intr = input;
return 0;
}
static int
dump_to_midi(unsigned char midi_byte)
{
unsigned long flags;
int ok = 0;
output_used = 1;
flags = splhigh();
if (GUS_MIDI_STATUS() & MIDI_XMIT_EMPTY) {
ok = 1;
outb(u_MidiData, midi_byte);
} else {
/*
* Enable Midi xmit interrupts (again)
*/
gus_midi_control |= MIDI_ENABLE_XMIT;
outb(u_MidiControl, gus_midi_control);
}
splx(flags);
return ok;
}
static void
gus_midi_close(int dev)
{
/*
* Reset FIFO pointers, disable intrs
*/
outb(u_MidiControl, MIDI_RESET);
midi_busy = 0;
}
static int
gus_midi_out(int dev, unsigned char midi_byte)
{
unsigned long flags;
/*
* Drain the local queue first
*/
flags = splhigh();
while (qlen && dump_to_midi(tmp_queue[qhead])) {
qlen--;
qhead++;
}
splx(flags);
/*
* Output the byte if the local queue is empty.
*/
if (!qlen)
if (dump_to_midi(midi_byte))
return 1; /* OK */
/*
* Put to the local queue
*/
if (qlen >= 256)
return 0; /* Local queue full */
flags = splhigh();
tmp_queue[qtail] = midi_byte;
qlen++;
qtail++;
splx(flags);
return 1;
}
static int
gus_midi_start_read(int dev)
{
return 0;
}
static int
gus_midi_end_read(int dev)
{
return 0;
}
static int
gus_midi_ioctl(int dev, unsigned cmd, ioctl_arg arg)
{
return -(EINVAL);
}
static void
gus_midi_kick(int dev)
{
}
static int
gus_midi_buffer_status(int dev)
{
unsigned long flags;
if (!output_used)
return 0;
flags = splhigh();
if (qlen && dump_to_midi(tmp_queue[qhead])) {
qlen--;
qhead++;
}
splx(flags);
return (qlen > 0) | !(GUS_MIDI_STATUS() & MIDI_XMIT_EMPTY);
}
#define MIDI_SYNTH_NAME "Gravis Ultrasound Midi"
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
#include <i386/isa/sound/midi_synth.h>
static struct midi_operations gus_midi_operations =
{
{"Gravis UltraSound Midi", 0, 0, SNDCARD_GUS},
&std_midi_synth,
{0},
gus_midi_open,
gus_midi_close,
gus_midi_ioctl,
gus_midi_out,
gus_midi_start_read,
gus_midi_end_read,
gus_midi_kick,
NULL, /* command */
gus_midi_buffer_status,
NULL
};
void
gus_midi_init()
{
if (num_midis >= MAX_MIDI_DEV) {
printf("Sound: Too many midi devices detected\n");
return;
}
outb(u_MidiControl, MIDI_RESET);
std_midi_synth.midi_dev = my_dev = num_midis;
midi_devs[num_midis++] = &gus_midi_operations;
return;
}
void
gus_midi_interrupt(int dummy)
{
unsigned char stat, data;
unsigned long flags;
flags = splhigh();
stat = GUS_MIDI_STATUS();
if (stat & MIDI_RCV_FULL) {
data = inb(u_MidiData);
if (input_opened)
midi_input_intr(my_dev, data);
}
if (stat & MIDI_XMIT_EMPTY) {
while (qlen && dump_to_midi(tmp_queue[qhead])) {
qlen--;
qhead++;
}
if (!qlen) {
/*
* Disable Midi output interrupts, since no data in
* the buffer
*/
gus_midi_control &= ~MIDI_ENABLE_XMIT;
outb(u_MidiControl, gus_midi_control);
}
}
splx(flags);
}
#endif