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diff --git a/cores/arduino/PluggableUSB.h b/cores/arduino/PluggableUSB.h
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+++ b/cores/arduino/PluggableUSB.h
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+/*
+  PluggableUSB.h
+  Copyright (c) 2015 Arduino LLC
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef PUSB_h
+#define PUSB_h
+
+#include "USBAPI.h"
+#include <stdint.h>
+
+#if defined(USBCON)
+
+class PluggableUSBModule {
+public:
+  PluggableUSBModule(uint8_t numEps, uint8_t numIfs, uint8_t *epType) :
+    numEndpoints(numEps), numInterfaces(numIfs), endpointType(epType)
+  { }
+
+protected:
+  virtual bool setup(USBSetup& setup) = 0;
+  virtual int getInterface(uint8_t* interfaceCount) = 0;
+  virtual int getDescriptor(USBSetup& setup) = 0;
+  virtual uint8_t getShortName(char *name) { name[0] = 'A'+pluggedInterface; return 1; }
+
+  uint8_t pluggedInterface;
+  uint8_t pluggedEndpoint;
+
+  const uint8_t numEndpoints;
+  const uint8_t numInterfaces;
+  const uint8_t *endpointType;
+
+  PluggableUSBModule *next = NULL;
+
+  friend class PluggableUSB_;
+};
+
+class PluggableUSB_ {
+public:
+  PluggableUSB_();
+  bool plug(PluggableUSBModule *node);
+  int getInterface(uint8_t* interfaceCount);
+  int getDescriptor(USBSetup& setup);
+  bool setup(USBSetup& setup);
+  void getShortName(char *iSerialNum);
+
+private:
+  uint8_t lastIf;
+  uint8_t lastEp;
+  PluggableUSBModule* rootNode;
+};
+
+// Replacement for global singleton.
+// This function prevents static-initialization-order-fiasco
+// https://isocpp.org/wiki/faq/ctors#static-init-order-on-first-use
+PluggableUSB_& PluggableUSB();
+
+#endif
+
+#endif