static int service_irq(struct echoaudio *chip)
{
int st;
/* */
if (get_dsp_register(chip, CHI32_STATUS_REG) & CHI32_STATUS_IRQ) {
st = 0;
#ifdef ECHOCARD_HAS_MIDI
/* */
if (chip->comm_page->midi_input[0]) /* */
st = midi_service_irq(chip); /* */
#endif
/* */
chip->comm_page->midi_input[0] = 0;
send_vector(chip, DSP_VC_ACK_INT);
return st;
}
return -1;
}
/* This is low level part of the interrupt handler.
It returns -1 if the IRQ is not ours, or N>=0 if it is, where N is the number
of midi data in the input queue. */
static int service_irq(struct echoaudio *chip)
{
int st;
/* Read the DSP status register and see if this DSP generated this interrupt */
if (get_dsp_register(chip, CHI32_STATUS_REG) & CHI32_STATUS_IRQ) {
st = 0;
#ifdef ECHOCARD_HAS_MIDI
/* Get and parse midi data if present */
if (chip->comm_page->midi_input[0]) /* The count is at index 0 */
st = midi_service_irq(chip); /* Returns how many midi bytes we received */
#endif
/* Clear the hardware interrupt */
chip->comm_page->midi_input[0] = 0;
send_vector(chip, DSP_VC_ACK_INT);
return st;
}
return -1;
}
