usb/line6/midi.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * Line 6 Linux USB driver
0004  *
0005  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
0006  */
0007
0008 #ifndef MIDI_H
0009 #define MIDI_H
0010
0011 #include <sound/rawmidi.h>
0012
0013 #include "midibuf.h"
0014
0015 #define MIDI_BUFFER_SIZE 1024
0016
0017 struct snd_line6_midi {
0018     /* Pointer back to the Line 6 driver data structure */
0019     struct usb_line6 *line6;
0020
0021     /* MIDI substream for receiving (or NULL if not active) */
0022     struct snd_rawmidi_substream *substream_receive;
0023
0024     /* MIDI substream for transmitting (or NULL if not active) */
0025     struct snd_rawmidi_substream *substream_transmit;
0026
0027     /* Number of currently active MIDI send URBs */
0028     int num_active_send_urbs;
0029
0030     /* Spin lock to protect MIDI buffer handling */
0031     spinlock_t lock;
0032
0033     /* Wait queue for MIDI transmission */
0034     wait_queue_head_t send_wait;
0035
0036     /* Buffer for incoming MIDI stream */
0037     struct midi_buffer midibuf_in;
0038
0039     /* Buffer for outgoing MIDI stream */
0040     struct midi_buffer midibuf_out;
0041 };
0042
0043 extern int line6_init_midi(struct usb_line6 *line6);
0044 extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
0045                    int length);
0046
0047 #endif