3 Copyright (C) Dean Camera, 2014.
5 dean [at] fourwalledcubicle [dot] com
10 Copyright 2014 Dean Camera (dean [at] fourwalledcubicle [dot] com)
12 Permission to use, copy, modify, distribute, and sell this
13 software and its documentation for any purpose is hereby granted
14 without fee, provided that the above copyright notice appear in
15 all copies and that both that the copyright notice and this
16 permission notice and warranty disclaimer appear in supporting
17 documentation, and that the name of the author not be used in
18 advertising or publicity pertaining to distribution of the
19 software without specific, written prior permission.
21 The author disclaims all warranties with regard to this
22 software, including all implied warranties of merchantability
23 and fitness. In no event shall the author be liable for any
24 special, indirect or consequential damages or any damages
25 whatsoever resulting from loss of use, data or profits, whether
26 in an action of contract, negligence or other tortious action,
27 arising out of or in connection with the use or performance of
33 * USB Device Descriptor processing routines, to determine the overall device parameters. Descriptors are special
34 * computer-readable structures which the host requests upon device enumeration, to determine information about
35 * the attached device.
38 #include "DeviceDescriptor.h"
40 /** Reads and processes an attached device's Device Descriptor, to determine compatibility
42 * This routine checks to ensure that the attached device's VID and PID matches Google's for Android devices.
44 * \return An error code from the \ref AndroidHost_GetDeviceDescriptorDataCodes_t enum.
46 uint8_t ProcessDeviceDescriptor(void)
48 USB_Descriptor_Device_t DeviceDescriptor;
50 /* Send the request to retrieve the device descriptor */
51 if (USB_Host_GetDeviceDescriptor(&DeviceDescriptor) != HOST_SENDCONTROL_Successful)
52 return DevControlError;
54 /* Validate returned data - ensure the returned data is a device descriptor */
55 if (DeviceDescriptor.Header.Type != DTYPE_Device)
56 return InvalidDeviceDataReturned;
58 /* Check the product ID to determine if the Android device is in accessory mode */
59 if ((DeviceDescriptor.ProductID != ANDROID_ACCESSORY_PRODUCT_ID) &&
60 (DeviceDescriptor.ProductID != ANDROID_ACCESSORY_ADB_PRODUCT_ID))
62 return NonAccessoryModeAndroidDevice;
65 return AccessoryModeAndroidDevice;