text: /*
   * Line6 Linux USB driver - 0.9.1beta
   *
   * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
   *
   *	This program is free software; you can redistribute it and/or
   *	modify it under the terms of the GNU General Public License as
   *	published by the Free Software Foundation, version 2.
   *
   */
  
  #ifndef MIDI_H
  #define MIDI_H
  
  #include <sound/rawmidi.h>
  
  #include "midibuf.h"
  
  #define MIDI_BUFFER_SIZE 1024
  
  struct snd_line6_midi {
  	/**
  		 Pointer back to the Line6 driver data structure.
  	*/
  	struct usb_line6 *line6;
  
  	/**
  		 MIDI substream for receiving (or NULL if not active).
  	*/
  	struct snd_rawmidi_substream *substream_receive;
  
  	/**
  		 MIDI substream for transmitting (or NULL if not active).
  	*/
  	struct snd_rawmidi_substream *substream_transmit;
  
  	/**
  		 Number of currently active MIDI send URBs.
  	*/
  	int num_active_send_urbs;
  
  	/**
  		 Spin lock to protect updates of send_urb.
  	*/
  	spinlock_t send_urb_lock;
  
  	/**
  		 Spin lock to protect MIDI buffer handling.
  	*/
  	spinlock_t midi_transmit_lock;
  
  	/**
  		 Wait queue for MIDI transmission.
  	*/
  	wait_queue_head_t send_wait;
  
  	/**
  		 Buffer for incoming MIDI stream.
  	*/
  	struct midi_buffer midibuf_in;
  
  	/**
  		 Buffer for outgoing MIDI stream.
  	*/
  	struct midi_buffer midibuf_out;
  };
  
  extern int line6_init_midi(struct usb_line6 *line6);
  extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
  			       int length);
  
  #endif
  