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For certain Universal Serial Bus (USB) devices, such as devices that are accessed by only a single application, you can install WinUSB (Winusb.sys) in the device's kernel-mode stack as the USB device's function driver instead of implementing a driver.

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Automatic installation of WinUSB without an INF file

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As an OEM or independent hardware vendor (IHV), you can build your device so that the Winusb.sys gets installed automatically on Windows 8 and later versions of the operating system. Such a device is called a WinUSB device and does not require you to write a custom INF file that references in-box Winusb.inf.

When you connect a WinUSB device, the system reads device information and loads Winusb.sys automatically.

For more information, see WinUSB Device.

Installing WinUSB by specifying the system-provided device class

When you connect your device, you might notice that Windows loads Winusb.sys automatically (if the IHV has defined the device as a WinUSB Device). Otherwise follow these instructions to load the driver:

Plug in your device to the host system.
Open Device Manager and locate the device.
Select and hold (or right-click) the device and select Update driver software... from the context menu.
In the wizard, select Browse my computer for driver software.
Select Let me pick from a list of device drivers on my computer.
From the list of device classes, select Universal Serial Bus devices.
The wizard displays WinUsb Device. Select it to load the driver.

If Universal Serial Bus devices does not appear in the list of device classes, then you need to install the driver by using a custom INF.The preceding procedure does not add a device interface GUID for an app (UWP app or Windows desktop app) to access the device. You must add the GUID manually by following this procedure.

Load the driver as described in the preceding procedure.
Generate a device interface GUID for your device, by using a tool such as guidgen.exe.
Find the registry key for the device under this key:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetEnumUSB<VID_vvvv&PID_pppp>
Under the Device Parameters key, add a String registry entry named DeviceInterfaceGUID or a Multi-String entry named DeviceInterfaceGUIDs. Set the value to the GUID you generated in step 2.
Disconnect the device from the system and reconnect it to the same physical port.Note If you change the physical port then you must repeat steps 1 through 4.

Writing a custom INF for WinUSB installation

As part of the driver package, you provide an .inf file that installs Winusb.sys as the function driver for the USB device.

The following example .inf file shows WinUSB installation for most USB devices with some modifications, such as changing USB_Install in section names to an appropriate DDInstall value. You should also change the version, manufacturer, and model sections as necessary. For example, provide an appropriate manufacture's name, the name of your signed catalog file, the correct device class, and the vendor identifier (VID) and product identifier (PID) for the device.

Also notice that the setup class is set to 'USBDevice'. Vendors can use the 'USBDevice' setup class for devices that do not belong to another class and are not USB host controllers or hubs.

If you are installing WinUSB as the function driver for one of the functions in a USB composite device, you must provide the hardware ID that is associated with the function, in the INF. You can obtain the hardware ID for the function from the properties of the devnode in Device Manager. The hardware ID string format is 'USBVID_vvvv&PID_pppp'.

The following INF installs WinUSB as the OSR USB FX2 board's function driver on a x64-based system.

Starting in Windows 10, version 1709, the Windows Driver Kit provides InfVerif.exe that you can use to test a driver INF file to make sure there are no syntax issues and the INF file is universal. We recommened that you provide a universal INF. For more information, see Using a Universal INF File.

Only include a ClassInstall32 section in a device INF file to install a new custom device setup class. INF files for devices in an installed class, whether a system-supplied device setup class or a custom class, must not include a ClassInstall32 section.

Except for device-specific values and several issues that are noted in the following list, you can use these sections and directives to install WinUSB for any USB device. These list items describe the Includes and Directives in the preceding .inf file.

USB_Install: The Include and Needs directives in the USB_Install section are required for installing WinUSB. You should not modify these directives.
USB_Install.Services: The Include directive in the USB_Install.Services section includes the system-supplied .inf for WinUSB (WinUSB.inf). This .inf file is installed by the WinUSB co-installer if it isn't already on the target system. The Needs directive specifies the section within WinUSB.inf that contains information required to install Winusb.sys as the device's function driver. You should not modify these directives.Note Because Windows XP doesn't provide WinUSB.inf, the file must either be copied to Windows XP systems by the co-installer, or you should provide a separate decorated section for Windows XP.
USB_Install.HW: This section is the key in the .inf file. It specifies the device interface globally unique identifier (GUID) for your device. The AddReg directive sets the specified interface GUID in a standard registry value. When Winusb.sys is loaded as the device's function driver, it reads the registry value DeviceInterfaceGUIDs key and uses the specified GUID to represent the device interface. You should replace the GUID in this example with one that you create specifically for your device. If the protocols for the device change, create a new device interface GUID.
Note User-mode software must call SetupDiGetClassDevs to enumerate the registered device interfaces that are associated with one of the device interface classes specified under the DeviceInterfaceGUIDs key. SetupDiGetClassDevs returns the device handle for the device that the user-mode software must then pass to the WinUsb_Initialize routine to obtain a WinUSB handle for the device interface. For more info about these routines, see How to Access a USB Device by Using WinUSB Functions.

The following INF installs WinUSB as the OSR USB FX2 board's function driver on a x64-based system. The example shows INF with WDF coinstallers.

USB_Install.CoInstallers: This section, which includes the referenced AddReg and CopyFiles sections, contains data and instructions to install the WinUSB and KMDF co-installers and associate them with the device. Most USB devices can use these sections and directives without modification.
The x86-based and x64-based versions of Windows have separate co-installers.
Note Each co-installer has free and checked versions. Use the free version to install WinUSB on free builds of Windows, including all retail versions. Use the checked version (with the '_chk' suffix) to install WinUSB on checked builds of Windows.

Each time Winusb.sys loads, it registers a device interface that has the device interface classes that are specified in the regis

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