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diff --git a/lib/usbhost/USB_Host_Shield_2.0/adk.h b/lib/usbhost/USB_Host_Shield_2.0/adk.h
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+/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This software may be distributed and modified under the terms of the GNU
+General Public License version 2 (GPL2) as published by the Free Software
+Foundation and appearing in the file GPL2.TXT included in the packaging of
+this file. Please note that GPL2 Section 2[b] requires that all works based
+on this software must also be made publicly available under the terms of
+the GPL2 ("Copyleft").
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web : http://www.circuitsathome.com
+e-mail : support@circuitsathome.com
+ */
+
+/* Google ADK interface support header */
+
+#if !defined(_ADK_H_)
+#define _ADK_H_
+
+#include "Usb.h"
+
+#define ADK_VID 0x18D1
+#define ADK_PID 0x2D00
+#define ADB_PID 0x2D01
+
+#define XOOM //enables repeating getProto() and getConf() attempts
+//necessary for slow devices such as Motorola XOOM
+//defined by default, can be commented out to save memory
+
+/* requests */
+
+#define ADK_GETPROTO 51 //check USB accessory protocol version
+#define ADK_SENDSTR 52 //send identifying string
+#define ADK_ACCSTART 53 //start device in accessory mode
+
+#define bmREQ_ADK_GET USB_SETUP_DEVICE_TO_HOST|USB_SETUP_TYPE_VENDOR|USB_SETUP_RECIPIENT_DEVICE
+#define bmREQ_ADK_SEND USB_SETUP_HOST_TO_DEVICE|USB_SETUP_TYPE_VENDOR|USB_SETUP_RECIPIENT_DEVICE
+
+#define ACCESSORY_STRING_MANUFACTURER 0
+#define ACCESSORY_STRING_MODEL 1
+#define ACCESSORY_STRING_DESCRIPTION 2
+#define ACCESSORY_STRING_VERSION 3
+#define ACCESSORY_STRING_URI 4
+#define ACCESSORY_STRING_SERIAL 5
+
+#define ADK_MAX_ENDPOINTS 3 //endpoint 0, bulk_IN, bulk_OUT
+
+class ADK;
+
+class ADK : public USBDeviceConfig, public UsbConfigXtracter {
+private:
+ /* ID strings */
+ const char* manufacturer;
+ const char* model;
+ const char* description;
+ const char* version;
+ const char* uri;
+ const char* serial;
+
+ /* ADK proprietary requests */
+ uint8_t getProto(uint8_t* adkproto);
+ uint8_t sendStr(uint8_t index, const char* str);
+ uint8_t switchAcc(void);
+
+protected:
+ static const uint8_t epDataInIndex; // DataIn endpoint index
+ static const uint8_t epDataOutIndex; // DataOUT endpoint index
+
+ /* mandatory members */
+ USB *pUsb;
+ uint8_t bAddress;
+ uint8_t bConfNum; // configuration number
+
+ uint8_t bNumEP; // total number of EP in the configuration
+ bool ready;
+
+ /* Endpoint data structure */
+ EpInfo epInfo[ADK_MAX_ENDPOINTS];
+
+ void PrintEndpointDescriptor(const USB_ENDPOINT_DESCRIPTOR* ep_ptr);
+
+public:
+ ADK(USB *pUsb, const char* manufacturer,
+ const char* model,
+ const char* description,
+ const char* version,
+ const char* uri,
+ const char* serial);
+
+ // Methods for receiving and sending data
+ uint8_t RcvData(uint16_t *nbytesptr, uint8_t *dataptr);
+ uint8_t SndData(uint16_t nbytes, uint8_t *dataptr);
+
+
+ // USBDeviceConfig implementation
+ uint8_t ConfigureDevice(uint8_t parent, uint8_t port, bool lowspeed);
+ uint8_t Init(uint8_t parent, uint8_t port, bool lowspeed);
+ uint8_t Release();
+
+ virtual uint8_t Poll() {
+ return 0;
+ };
+
+ virtual uint8_t GetAddress() {
+ return bAddress;
+ };
+
+ virtual bool isReady() {
+ return ready;
+ };
+
+ virtual bool VIDPIDOK(uint16_t vid, uint16_t pid) {
+ return (vid == ADK_VID && (pid == ADK_PID || pid == ADB_PID));
+ };
+
+ //UsbConfigXtracter implementation
+ void EndpointXtract(uint8_t conf, uint8_t iface, uint8_t alt, uint8_t proto, const USB_ENDPOINT_DESCRIPTOR *ep);
+}; //class ADK : public USBDeviceConfig ...
+
+/* get ADK protocol version */
+
+/* returns 2 bytes in *adkproto */
+inline uint8_t ADK::getProto(uint8_t* adkproto) {
+ return ( pUsb->ctrlReq(bAddress, 0, bmREQ_ADK_GET, ADK_GETPROTO, 0, 0, 0, 2, 2, adkproto, NULL));
+}
+
+/* send ADK string */
+inline uint8_t ADK::sendStr(uint8_t index, const char* str) {
+ return ( pUsb->ctrlReq(bAddress, 0, bmREQ_ADK_SEND, ADK_SENDSTR, 0, 0, index, strlen(str) + 1, strlen(str) + 1, (uint8_t*)str, NULL));
+}
+
+/* switch to accessory mode */
+inline uint8_t ADK::switchAcc(void) {
+ return ( pUsb->ctrlReq(bAddress, 0, bmREQ_ADK_SEND, ADK_ACCSTART, 0, 0, 0, 0, 0, NULL, NULL));
+}
+
+#endif // _ADK_H_