static int gus_midi_out(int dev, unsigned char midi_byte)
{
unsigned long flags;
/*
* Drain the local queue first
*/
save_flags(flags);
cli();
while (qlen && dump_to_midi(tmp_queue[qhead]))
{
qlen--;
qhead++;
}
restore_flags(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
*/
save_flags(flags);
cli();
tmp_queue[qtail] = midi_byte;
qlen++;
qtail++;
restore_flags(flags);
return 1;
}
static int gus_midi_buffer_status(int dev)
{
unsigned long flags;
if (!output_used)
return 0;
save_flags(flags);
cli();
if (qlen && dump_to_midi(tmp_queue[qhead]))
{
qlen--;
qhead++;
}
restore_flags(flags);
return (qlen > 0) | !(GUS_MIDI_STATUS() & MIDI_XMIT_EMPTY);
}
void
gus_midi_interrupt (int dummy)
{
unsigned char stat, data;
unsigned long flags;
DISABLE_INTR (flags);
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 (gus_midi_control, u_MidiControl);
}
}
#if 0
if (stat & MIDI_FRAME_ERR)
printk ("GUS: Midi framing error\n");
if (stat & MIDI_OVERRUN && input_opened)
printk ("GUS: Midi input overrun\n");
#endif
RESTORE_INTR (flags);
}
static int
gus_midi_buffer_status (int dev)
{
unsigned long flags;
if (!output_used)
return 0;
DISABLE_INTR (flags);
if (qlen && dump_to_midi (tmp_queue[qhead]))
{
qlen--;
qhead++;
}
RESTORE_INTR (flags);
return (qlen > 0) | !(GUS_MIDI_STATUS () & MIDI_XMIT_EMPTY);
}
void gus_midi_interrupt(int dummy)
{
volatile unsigned char stat, data;
unsigned long flags;
int timeout = 10;
save_flags(flags);
cli();
while (timeout-- > 0 && (stat = GUS_MIDI_STATUS()) & (MIDI_RCV_FULL | MIDI_XMIT_EMPTY))
{
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((gus_midi_control), u_MidiControl);
outb((gus_midi_control), u_MidiControl);
}
}
}
restore_flags(flags);
}
