/*
* Processes the data read from the device.
*/
static void snd_usbmidi_in_urb_complete(struct urb* urb, struct pt_regs *regs)
{
snd_usb_midi_in_endpoint_t* ep = urb->context;
if (urb->status == 0) {
dump_urb("received", urb->transfer_buffer, urb->actual_length);
ep->umidi->usb_protocol_ops->input(ep, urb->transfer_buffer,
urb->actual_length);
} else {
int err = snd_usbmidi_urb_error(urb->status);
if (err < 0) {
if (err != -ENODEV) {
ep->error_resubmit = 1;
mod_timer(&ep->umidi->error_timer,
jiffies + ERROR_DELAY_JIFFIES);
}
return;
}
}
if (usb_pipe_needs_resubmit(urb->pipe)) {
urb->dev = ep->umidi->chip->dev;
snd_usbmidi_submit_urb(urb, GFP_ATOMIC);
}
}
/* called after transfers had been interrupted due to some USB error */
static void snd_usbmidi_error_timer(unsigned long data)
{
snd_usb_midi_t *umidi = (snd_usb_midi_t *)data;
int i;
for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) {
snd_usb_midi_in_endpoint_t *in = umidi->endpoints[i].in;
if (in && in->error_resubmit) {
in->error_resubmit = 0;
in->urb->dev = umidi->chip->dev;
snd_usbmidi_submit_urb(in->urb, GFP_ATOMIC);
}
if (umidi->endpoints[i].out)
snd_usbmidi_do_output(umidi->endpoints[i].out);
}
}
/*
* Processes the data read from the device.
*/
static void snd_usbmidi_in_urb_complete(struct urb* urb, struct pt_regs *regs)
{
snd_usb_midi_in_endpoint_t* ep = urb->context;
if (urb->status == 0) {
uint8_t* buffer = (uint8_t*)ep->urb->transfer_buffer;
int i;
for (i = 0; i + 4 <= urb->actual_length; i += 4)
if (buffer[i] != 0)
snd_usbmidi_input_packet(ep, &buffer[i]);
} else {
if (snd_usbmidi_urb_error(urb->status) < 0)
return;
}
if (usb_pipe_needs_resubmit(urb->pipe)) {
urb->dev = ep->umidi->chip->dev;
snd_usbmidi_submit_urb(urb, GFP_ATOMIC);
}
}
/*
* This is called when some data should be transferred to the device
* (from one or more substreams).
*/
static void snd_usbmidi_do_output(snd_usb_midi_out_endpoint_t* ep)
{
struct urb* urb = ep->urb;
unsigned long flags;
spin_lock_irqsave(&ep->buffer_lock, flags);
if (ep->urb_active || ep->umidi->chip->shutdown) {
spin_unlock_irqrestore(&ep->buffer_lock, flags);
return;
}
urb->transfer_buffer_length = 0;
ep->umidi->usb_protocol_ops->output(ep);
if (urb->transfer_buffer_length > 0) {
dump_urb("sending", urb->transfer_buffer,
urb->transfer_buffer_length);
urb->dev = ep->umidi->chip->dev;
ep->urb_active = snd_usbmidi_submit_urb(urb, GFP_ATOMIC) >= 0;
}
spin_unlock_irqrestore(&ep->buffer_lock, flags);
}
