1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Line 6 Linux USB driver
4  *
5  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
6  */
7 
8 #ifndef MIDI_H
9 #define MIDI_H
10 
11 #include <sound/rawmidi.h>
12 
13 #include "midibuf.h"
14 
15 #define MIDI_BUFFER_SIZE 1024
16 
17 struct snd_line6_midi {
18 	/* Pointer back to the Line 6 driver data structure */
19 	struct usb_line6 *line6;
20 
21 	/* MIDI substream for receiving (or NULL if not active) */
22 	struct snd_rawmidi_substream *substream_receive;
23 
24 	/* MIDI substream for transmitting (or NULL if not active) */
25 	struct snd_rawmidi_substream *substream_transmit;
26 
27 	/* Number of currently active MIDI send URBs */
28 	int num_active_send_urbs;
29 
30 	/* Spin lock to protect MIDI buffer handling */
31 	spinlock_t lock;
32 
33 	/* Wait queue for MIDI transmission */
34 	wait_queue_head_t send_wait;
35 
36 	/* Buffer for incoming MIDI stream */
37 	struct midi_buffer midibuf_in;
38 
39 	/* Buffer for outgoing MIDI stream */
40 	struct midi_buffer midibuf_out;
41 };
42 
43 extern int line6_init_midi(struct usb_line6 *line6);
44 extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
45 			       int length);
46 
47 #endif
48