faderport: add punch action

libs/surfaces/faderport/faderport.cc

@@ -149,6 +149,8 @@ FaderPort::FaderPort (Session& s)
 	get_button (Ffwd).set_action (boost::bind (&BasicUI::ffwd, this), true);
 	get_button (Ffwd).set_action (boost::bind (&BasicUI::goto_end, this), true, ShiftDown);
 
+	get_button (Punch).set_action (boost::bind (&FaderPort::punch, this), true);
+
 	get_button (Loop).set_action (boost::bind (&BasicUI::loop_toggle, this), true);
 	get_button (Loop).set_action (boost::bind (&BasicUI::add_marker, this, string()), true, ShiftDown);
 

libs/surfaces/faderport/faderport.h

@@ -313,6 +313,8 @@ class FaderPort : public ARDOUR::ControlProtocol, public AbstractUI<FaderPortReq
 	void ardour_pan_azimuth (int);
 	void ardour_pan_width (int);
 	void mixbus_pan (int);
+
+	void punch ();
 };
 
 }

libs/surfaces/faderport/operations.cc

@@ -257,3 +257,9 @@ FaderPort::mixbus_pan (int delta)
 {
 
 }
+
+void
+FaderPort::punch ()
+{
+	access_action ("Transport/TogglePunch");
+}