1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Line 6 Linux USB driver
4 *
5 * Copyright (C) 2004-2010 Markus Grabner (line6@grabner-graz.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
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