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 
21 struct 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 
78 extern int line6_init_midi(struct usb_line6 *line6);
79 extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
80 			       int length);
81 
82 #endif
83