typedef struct vmidi_devc {
  	   int dev;
  
  	/* State variables */

  	   int opened;

  	   spinlock_t lock;

  	/* MIDI fields */
  	   int my_mididev;
  	   int pair_mididev;
  	   int input_opened;
  	   int intr_active;
  	   void (*midi_input_intr) (int dev, unsigned char data);
  	} vmidi_devc;