Is there cyusb.sys driver sourcecode?
Please download "Source code package for Cypress SuperSpeed USB Suite for Windows (CyAPI, CyUSB, CyUSB3) - See ReadMe.txt for details" to get the source code of CyUSB3.sys.
You can use CyUSB3.sys for your application. It can do what all CyUSB.sys can do and also it can handle USB 3.0 transfers.
This can be downloaded from the following webpage:http://www.cypress.com/?rID=57990