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diff --git a/libs/surfaces/mackie/surface_port.h b/libs/surfaces/mackie/surface_port.h
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+++ b/libs/surfaces/mackie/surface_port.h
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+/*
+	Copyright (C) 2006,2007 John Anderson
+
+	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; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the Free Software
+	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+#ifndef surface_port_h
+#define surface_port_h
+
+#include <sigc++/signal.h>
+#include <glibmm/thread.h>
+
+#include "midi_byte_array.h"
+#include "types.h"
+
+namespace MIDI {
+	class Port;
+}
+
+namespace Mackie
+{
+
+/**
+	Make a relationship between a midi port and a Mackie device.
+*/
+class SurfacePort : public sigc::trackable
+{
+public:
+	SurfacePort( MIDI::Port & port, int number );
+	virtual ~SurfacePort();
+	
+	// when this is successful, active() should return true
+	virtual void open() = 0;
+	
+	// subclasses should call this before doing their own close
+	virtual void close() = 0;
+
+	/// read bytes from the port. They'll either end up in the
+	/// parser, or if that's not active they'll be returned
+	MidiByteArray read();
+	
+	/// an easier way to output bytes via midi
+	void write( const MidiByteArray & );
+	
+	/// write a sysex message
+	void write_sysex( const MidiByteArray & mba );
+	void write_sysex( MIDI::byte msg );
+
+	// return the correct sysex header for this port
+	virtual const MidiByteArray & sysex_hdr() const = 0;
+
+	MIDI::Port & port() { return _port; }
+	const MIDI::Port & port() const { return _port; }
+	
+	// all control notofications are sent from here
+	sigc::signal<void, SurfacePort &, Control &, const ControlState &> control_event;
+	
+	// emitted just before the port goes into initialisation
+	// where it tries to establish that its device is connected
+	sigc::signal<void> init_event;
+	
+	// emitted when the port completes initialisation successfully
+	sigc::signal<void> active_event;
+
+	// emitted when the port goes inactive (ie a read or write failed)
+	sigc::signal<void> inactive_event;
+	
+	// the port number - master is 0, extenders are 1,2,3,4
+	virtual int number() const { return _number; }
+	
+	// number of strips handled by this port. Usually 8.
+	virtual int strips() const = 0;
+
+	virtual bool active() const { return _active; }
+	virtual void active( bool yn ) { _active = yn; }
+	
+private:
+	MIDI::Port & _port;
+	int _number;
+	bool _active;
+
+	Glib::RecMutex _rwlock;
+};	
+
+std::ostream & operator << ( std::ostream & , const SurfacePort & port );
+
+}
+
+#endif