v4.19.13 snapshot.
diff --git a/sound/usb/line6/midi.h b/sound/usb/line6/midi.h
new file mode 100644
index 0000000..cf82d69
--- /dev/null
+++ b/sound/usb/line6/midi.h
@@ -0,0 +1,51 @@
+/*
+ * Line 6 Linux USB driver
+ *
+ * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2.
+ *
+ */
+
+#ifndef MIDI_H
+#define MIDI_H
+
+#include <sound/rawmidi.h>
+
+#include "midibuf.h"
+
+#define MIDI_BUFFER_SIZE 1024
+
+struct snd_line6_midi {
+ /* Pointer back to the Line 6 driver data structure */
+ struct usb_line6 *line6;
+
+ /* MIDI substream for receiving (or NULL if not active) */
+ struct snd_rawmidi_substream *substream_receive;
+
+ /* MIDI substream for transmitting (or NULL if not active) */
+ struct snd_rawmidi_substream *substream_transmit;
+
+ /* Number of currently active MIDI send URBs */
+ int num_active_send_urbs;
+
+ /* Spin lock to protect MIDI buffer handling */
+ spinlock_t lock;
+
+ /* Wait queue for MIDI transmission */
+ wait_queue_head_t send_wait;
+
+ /* Buffer for incoming MIDI stream */
+ struct midi_buffer midibuf_in;
+
+ /* Buffer for outgoing MIDI stream */
+ struct midi_buffer midibuf_out;
+};
+
+extern int line6_init_midi(struct usb_line6 *line6);
+extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
+ int length);
+
+#endif