Root/drivers/staging/line6/midi.h

1/*
2 * Line6 Linux USB driver - 0.9.1beta
3 *
4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2.
9 *
10 */
11
12#ifndef MIDI_H
13#define MIDI_H
14
15#include <sound/rawmidi.h>
16
17#include "midibuf.h"
18
19#define MIDI_BUFFER_SIZE 1024
20
21struct snd_line6_midi {
22    /**
23         Pointer back to the Line6 driver data structure.
24    */
25    struct usb_line6 *line6;
26
27    /**
28         MIDI substream for receiving (or NULL if not active).
29    */
30    struct snd_rawmidi_substream *substream_receive;
31
32    /**
33         MIDI substream for transmitting (or NULL if not active).
34    */
35    struct snd_rawmidi_substream *substream_transmit;
36
37    /**
38         Number of currently active MIDI send URBs.
39    */
40    int num_active_send_urbs;
41
42    /**
43         Spin lock to protect updates of send_urb.
44    */
45    spinlock_t send_urb_lock;
46
47    /**
48         Spin lock to protect MIDI buffer handling.
49    */
50    spinlock_t midi_transmit_lock;
51
52    /**
53         Wait queue for MIDI transmission.
54    */
55    wait_queue_head_t send_wait;
56
57    /**
58         Bit mask for output MIDI channels.
59    */
60    unsigned short midi_mask_transmit;
61
62    /**
63         Bit mask for input MIDI channels.
64    */
65    unsigned short midi_mask_receive;
66
67    /**
68         Buffer for incoming MIDI stream.
69    */
70    struct MidiBuffer midibuf_in;
71
72    /**
73         Buffer for outgoing MIDI stream.
74    */
75    struct MidiBuffer midibuf_out;
76};
77
78extern int line6_init_midi(struct usb_line6 *line6);
79extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
80                   int length);
81
82#endif
83

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