Move out Android Accessory Host demo to the Host mode LowLevel directory now that...

[pub/lufa.git] / Demos / Host / LowLevel / AndroidAccessoryHost / DeviceDescriptor.c

diff --git a/Demos/Host/LowLevel/AndroidAccessoryHost/DeviceDescriptor.c b/Demos/Host/LowLevel/AndroidAccessoryHost/DeviceDescriptor.c
new file mode 100644 (file)
index 0000000..be6bf10
--- /dev/null
+++ b/Demos/Host/LowLevel/AndroidAccessoryHost/DeviceDescriptor.c
@@ -0,0 +1,71 @@
+/*
+             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.
+ *
+ *  \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;
+
+       /* Validate returned device Vendor ID against the Android ADK spec values */
+       if (DeviceDescriptor.VendorID != ANDROID_VENDOR_ID)
+         return IncorrectAndroidDevice;
+
+       /* 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;
+}
+