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+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2017.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaims all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * USB Device Descriptor processing routines, to determine the overall device parameters. Descriptors are special
+ * computer-readable structures which the host requests upon device enumeration, to determine information about
+ * the attached device.
+ */
+
+#include "DeviceDescriptor.h"
+
+/** Reads and processes an attached device's Device Descriptor, to determine compatibility
+ *
+ * This routine checks to ensure that the attached device's VID and PID matches Google's for Android devices.
+ *
+ * \return An error code from the \ref AndroidHost_GetDeviceDescriptorDataCodes_t enum.
+ */
+uint8_t ProcessDeviceDescriptor(void)
+{
+ USB_Descriptor_Device_t DeviceDescriptor;
+
+ /* Send the request to retrieve the device descriptor */
+ if (USB_Host_GetDeviceDescriptor(&DeviceDescriptor) != HOST_SENDCONTROL_Successful)
+ return DevControlError;
+
+ /* Validate returned data - ensure the returned data is a device descriptor */
+ if (DeviceDescriptor.Header.Type != DTYPE_Device)
+ return InvalidDeviceDataReturned;
+
+ /* Check the product ID to determine if the Android device is in accessory mode */
+ if ((DeviceDescriptor.ProductID != ANDROID_ACCESSORY_PRODUCT_ID) &&
+ (DeviceDescriptor.ProductID != ANDROID_ACCESSORY_ADB_PRODUCT_ID))
+ {
+ return NonAccessoryModeAndroidDevice;
+ }
+
+ return AccessoryModeAndroidDevice;
+}
+