sound/usb/line6/midi.h

   1 /*
   2  * Line 6 Linux USB driver
   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         /* Pointer back to the Line 6 driver data structure */
  23         struct usb_line6 *line6;
  24
  25         /* MIDI substream for receiving (or NULL if not active) */
  26         struct snd_rawmidi_substream *substream_receive;
  27
  28         /* MIDI substream for transmitting (or NULL if not active) */
  29         struct snd_rawmidi_substream *substream_transmit;
  30
  31         /* Number of currently active MIDI send URBs */
  32         int num_active_send_urbs;
  33
  34         /* Spin lock to protect MIDI buffer handling */
  35         spinlock_t lock;
  36
  37         /* Wait queue for MIDI transmission */
  38         wait_queue_head_t send_wait;
  39
  40         /* Buffer for incoming MIDI stream */
  41         struct midi_buffer midibuf_in;
  42
  43         /* Buffer for outgoing MIDI stream */
  44         struct midi_buffer midibuf_out;
  45 };
  46
  47 extern int line6_init_midi(struct usb_line6 *line6);
  48 extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
  49                                int length);
  50
  51 #endif