The usba module provides debugging support for the platform-independent Universal Serial Bus (USB) framework.
Given the address of a usba_device structure, print summary information. If no address is supplied, this dcmd walks the global list of usba_device structures. If the –p option is present, also list information for all open pipes on this device. If the –v option is present, list verbose information for each device.
Given the address of a USB pipe handle structure (struct usba_ph_impl), print summary information for this handle.