For information about writing a custom INF, see WinUSB (Winusb.sys) Installation. Those sections are required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications required to find the device and talk to it. The custom INF specifies the device-specific hardware ID and also includes sections from the in-box Winusb.inf. Microsoft provides Winusb.inf that contains information required by to install Winusb.sys as the device driver for a USB device.īefore Windows 8, to load Winusb.sys as the function driver, you needed to provide a custom INF. Conversely, if you need to provide a custom INF, you should not define your device as a WinUSB device and specify the hardware ID of the device in the INF. For a WinUSB device, you are not required to distribute INF files for your device, making the driver installation process simple for end users. The purpose of a WinUSB device is to enable Windows to load Winusb.sys as the device's function driver without a custom INF file. What is a WinUSB deviceĪ WinUSB device is a Universal Serial Bus (USB) device whose firmware defines certain Microsoft operating system (OS) feature descriptors that report the compatible ID as "WINUSB".
The information in this article applies to you if you are an OEM or independent hardware vendor (IHV) developing a device for which you want to use Winusb.sys as the function driver and want to load the driver automatically without having to provide a custom INF.
In this article, you will learn about how a WinUSB device is recognized by Windows.
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