68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2019.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2019 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* USB Device Descriptor processing routines, to determine the overall device parameters. Descriptors are special
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* computer-readable structures which the host requests upon device enumeration, to determine information about
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* the attached device.
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*/
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#include "DeviceDescriptor.h"
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/** Reads and processes an attached device's Device Descriptor, to determine compatibility
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*
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* This routine checks to ensure that the attached device's VID and PID matches Google's for Android devices.
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*
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* \return An error code from the \ref AndroidHost_GetDeviceDescriptorDataCodes_t enum.
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*/
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uint8_t ProcessDeviceDescriptor(void)
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{
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USB_Descriptor_Device_t DeviceDescriptor;
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/* Send the request to retrieve the device descriptor */
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if (USB_Host_GetDeviceDescriptor(&DeviceDescriptor) != HOST_SENDCONTROL_Successful)
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return DevControlError;
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/* Validate returned data - ensure the returned data is a device descriptor */
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if (DeviceDescriptor.Header.Type != DTYPE_Device)
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return InvalidDeviceDataReturned;
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/* Check the product ID to determine if the Android device is in accessory mode */
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if ((DeviceDescriptor.ProductID != ANDROID_ACCESSORY_PRODUCT_ID) &&
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(DeviceDescriptor.ProductID != ANDROID_ACCESSORY_ADB_PRODUCT_ID))
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{
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return NonAccessoryModeAndroidDevice;
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}
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return AccessoryModeAndroidDevice;
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}
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