+static void snd_usbmidi_us122l_input(struct snd_usb_midi_in_endpoint *ep,
+ uint8_t *buffer, int buffer_length)
+{
+ if (buffer_length != 9)
+ return;
+ buffer_length = 8;
+ while (buffer_length && buffer[buffer_length - 1] == 0xFD)
+ buffer_length--;
+ if (buffer_length)
+ snd_usbmidi_input_data(ep, 0, buffer, buffer_length);
+}
+
+static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep)
+{
+ int count;
+
+ if (!ep->ports[0].active)
+ return;
+ count = ep->urb->dev->speed == USB_SPEED_HIGH ? 1 : 2;
+ count = snd_rawmidi_transmit(ep->ports[0].substream,
+ ep->urb->transfer_buffer,
+ count);
+ if (count < 1) {
+ ep->ports[0].active = 0;
+ return;
+ }
+
+ memset(ep->urb->transfer_buffer + count, 0xFD, 9 - count);
+ ep->urb->transfer_buffer_length = count;
+}
+
+static struct usb_protocol_ops snd_usbmidi_122l_ops = {
+ .input = snd_usbmidi_us122l_input,
+ .output = snd_usbmidi_us122l_output,
+};
+