freebsd-skq/sys/i386/isa/sound/pas2_midi.c
1994-04-23 01:50:14 +00:00

296 lines
6.0 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 "sound_config.h"
#ifdef CONFIGURE_SOUNDCARD
#include "pas.h"
#if !defined(EXCLUDE_PAS) && !defined(EXCLUDE_MIDI) && defined(EXCLUDE_PRO_MIDI)
static int midi_busy = 0, input_opened = 0;
static int my_dev;
static volatile int ofifo_bytes = 0;
static unsigned char tmp_queue[256];
static volatile int qlen;
static volatile unsigned char qhead, qtail;
static void (*midi_input_intr) (int dev, unsigned char data);
static int
pas_midi_open (int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
int err;
unsigned long flags;
unsigned char ctrl;
if (midi_busy)
{
printk ("PAS2: Midi busy\n");
return RET_ERROR (EBUSY);
}
/* Reset input and output FIFO pointers */
pas_write (M_C_RESET_INPUT_FIFO | M_C_RESET_OUTPUT_FIFO,
MIDI_CONTROL);
DISABLE_INTR (flags);
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;
RESTORE_INTR (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 (unsigned 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, unsigned char midi_byte)
{
unsigned long flags;
/*
* Drain the local queue first
*/
DISABLE_INTR (flags);
while (qlen && dump_to_midi (tmp_queue[qhead]))
{
qlen--;
qhead++;
}
RESTORE_INTR (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 */
DISABLE_INTR (flags);
tmp_queue[qtail] = midi_byte;
qlen++;
qtail++;
RESTORE_INTR (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, unsigned cmd, unsigned arg)
{
return RET_ERROR (EINVAL);
}
static void
pas_midi_kick (int dev)
{
ofifo_bytes = 0;
}
static int
pas_buffer_status (int dev)
{
return !qlen;
}
static struct midi_operations pas_midi_operations =
{
{"Pro Audio Spectrum", 0, 0, SNDCARD_PAS},
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
};
long
pas_midi_init (long mem_start)
{
my_dev = num_midis;
midi_devs[num_midis++] = &pas_midi_operations;
return mem_start;
}
void
pas_midi_interrupt (void)
{
unsigned char stat;
int i, incount;
unsigned 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;
}
DISABLE_INTR (flags);
while (qlen && dump_to_midi (tmp_queue[qhead]))
{
qlen--;
qhead++;
}
RESTORE_INTR (flags);
}
if (stat & M_S_FRAMING_ERROR)
printk ("MIDI framing error\n");
if (stat & M_S_OUTPUT_OVERRUN)
{
printk ("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
#endif