IOCTL_INTERNAL_USBFN_GET_CLASS_INFO IOCTL (usbfnioctl.h)

The class driver sends this request IO control code to retrieve information about the available pipes for a device, as configured in the registry.

Major code

IRP_MJ_INTERNAL_DEVICE_CONTROL

Input buffer

NULL.

Input buffer length

None.

Output buffer

A pointer to a buffer that contains a USBFN_CLASS_INFORMATION_PACKET structure. Upon completion, UFX populates the structure with the name, the device interface GUID, and details of the interface when operating at a particular bus speed.

Output buffer length

The size of a USBFN_CLASS_INFORMATION_PACKET structure.

Status block

If the request is successful, the USB function class extension (UFX) returns STATUS_SUCCESS, or another status value for which NT_SUCCESS(status) equals TRUE. Otherwise it returns a status value for which NT_SUCCESS(status) equals FALSE.

Remarks

The class driver should send this IOCTL request during initialization so that it can enumerate the endpoints and attributes.

Requirements