freebsd-dev/sys/i386/isa/sound/pas2_midi.c
Peter Wemm a0f70ac053 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

286 lines
5.7 KiB
C

/*
* sound/pas2_midi.c
*
* The low level driver for the PAS 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_PAS) && defined(CONFIG_MIDI)
#include <i386/isa/sound/pas_hw.h>
static int midi_busy = 0, input_opened = 0;
static int my_dev;
static volatile int ofifo_bytes = 0;
static u_char tmp_queue[256];
static volatile int qlen;
static volatile u_char qhead, qtail;
static void (*midi_input_intr) (int dev, u_char data);
static int
pas_midi_open(int dev, int mode,
void (*input) (int dev, u_char data),
void (*output) (int dev)
)
{
int err;
u_long flags;
u_char ctrl;
if (midi_busy) {
printf("PAS2: Midi busy\n");
return -(EBUSY);
}
/*
* Reset input and output FIFO pointers
*/
pas_write(M_C_RESET_INPUT_FIFO | M_C_RESET_OUTPUT_FIFO,
MIDI_CONTROL);
flags = splhigh();
if ((err = pas_set_intr(I_M_MIDI_IRQ_ENABLE)) < 0)
return err;
/*
* Enable input available and output FIFO empty interrupts
*/
ctrl = 0;
input_opened = 0;
midi_input_intr = input;
if (mode == OPEN_READ || mode == OPEN_READWRITE) {
ctrl |= M_C_ENA_INPUT_IRQ; /* Enable input */
input_opened = 1;
}
if (mode == OPEN_WRITE || mode == OPEN_READWRITE) {
ctrl |= M_C_ENA_OUTPUT_IRQ | /* Enable output */
M_C_ENA_OUTPUT_HALF_IRQ;
}
pas_write(ctrl,
MIDI_CONTROL);
/*
* Acknowledge any pending interrupts
*/
pas_write(0xff, MIDI_STATUS);
ofifo_bytes = 0;
splx(flags);
midi_busy = 1;
qlen = qhead = qtail = 0;
return 0;
}
static void
pas_midi_close(int dev)
{
/*
* Reset FIFO pointers, disable intrs
*/
pas_write(M_C_RESET_INPUT_FIFO | M_C_RESET_OUTPUT_FIFO, MIDI_CONTROL);
pas_remove_intr(I_M_MIDI_IRQ_ENABLE);
midi_busy = 0;
}
static int
dump_to_midi(u_char midi_byte)
{
int fifo_space, x;
fifo_space = ((x = pas_read(MIDI_FIFO_STATUS)) >> 4) & 0x0f;
if (fifo_space == 15 || (fifo_space < 2 && ofifo_bytes > 13)) { /* Fifo full */
return 0; /* Upper layer will call again */
}
ofifo_bytes++;
pas_write(midi_byte, MIDI_DATA);
return 1;
}
static int
pas_midi_out(int dev, u_char midi_byte)
{
u_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
pas_midi_start_read(int dev)
{
return 0;
}
static int
pas_midi_end_read(int dev)
{
return 0;
}
static int
pas_midi_ioctl(int dev, u_int cmd, ioctl_arg arg)
{
return -(EINVAL);
}
static void
pas_midi_kick(int dev)
{
ofifo_bytes = 0;
}
static int
pas_buffer_status(int dev)
{
return qlen;
}
#define MIDI_SYNTH_NAME "Pro Audio Spectrum Midi"
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
#include <i386/isa/sound/midi_synth.h>
static struct midi_operations pas_midi_operations =
{
{"Pro Audio Spectrum", 0, 0, SNDCARD_PAS},
&std_midi_synth,
{0},
pas_midi_open,
pas_midi_close,
pas_midi_ioctl,
pas_midi_out,
pas_midi_start_read,
pas_midi_end_read,
pas_midi_kick,
NULL, /* command */
pas_buffer_status,
NULL
};
void
pas_midi_init()
{
if (num_midis >= MAX_MIDI_DEV) {
printf("Sound: Too many midi devices detected\n");
return;
}
std_midi_synth.midi_dev = my_dev = num_midis;
midi_devs[num_midis++] = &pas_midi_operations;
return;
}
void
pas_midi_interrupt(void)
{
u_char stat;
int i, incount;
u_long flags;
stat = pas_read(MIDI_STATUS);
if (stat & M_S_INPUT_AVAIL) { /* Input byte available */
incount = pas_read(MIDI_FIFO_STATUS) & 0x0f; /* Input FIFO count */
if (!incount)
incount = 16;
for (i = 0; i < incount; i++)
if (input_opened) {
midi_input_intr(my_dev, pas_read(MIDI_DATA));
} else
pas_read(MIDI_DATA); /* Flush */
}
if (stat & (M_S_OUTPUT_EMPTY | M_S_OUTPUT_HALF_EMPTY)) {
if (!(stat & M_S_OUTPUT_EMPTY)) {
ofifo_bytes = 8;
} else {
ofifo_bytes = 0;
}
flags = splhigh();
while (qlen && dump_to_midi(tmp_queue[qhead])) {
qlen--;
qhead++;
}
splx(flags);
}
if (stat & M_S_OUTPUT_OVERRUN) {
printf("MIDI output overrun %x,%x,%d \n", pas_read(MIDI_FIFO_STATUS), stat, ofifo_bytes);
ofifo_bytes = 100;
}
pas_write(stat, MIDI_STATUS); /* Acknowledge interrupts */
}
#endif