DeviceDescriptor.c 2.62 KB
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 /* LUFA Library Copyright (C) Dean Camera, 2011. dean [at] fourwalledcubicle [dot] com www.lufa-lib.org */ /* Copyright 2011 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 disclaim 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. *  Dean Camera committed Jul 11, 2011 44  * \return An error code from the \ref AndroidHost_GetDeviceDescriptorDataCodes_t enum.  45 46 47 48 49 50 51 52 53 54 55 56 57  */ 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;  Dean Camera committed Jul 11, 2011 58  /* Validate returned device Vendor ID against the Android ADK spec values */  59  if (DeviceDescriptor.VendorID != ANDROID_VENDOR_ID)  Dean Camera committed Jul 11, 2011 60  return IncorrectAndroidDevice;  61   Dean Camera committed Jun 27, 2011 62 63  /* Check the product ID to determine if the Android device is in accessory mode */ if ((DeviceDescriptor.ProductID != ANDROID_ACCESSORY_PRODUCT_ID) &&  64 65 66 67 68 69 70 71  (DeviceDescriptor.ProductID != ANDROID_ACCESSORY_ADB_PRODUCT_ID)) { return NonAccessoryModeAndroidDevice; } return AccessoryModeAndroidDevice; }