Abstract: A computer system includes USB class protocol-aware modules for USB devices as part of a xHCI host controller. The protocol-aware modules serve as accelerators by implementing critical portions of the device class protocols, which includes fetching higher level protocol data directly from client buffers for transmission and delivering decoded data to client buffers on receipt; and emulating a register-based interface for the benefit of system software on the host computer.

Abstract: Security arrangements for a universal serial bus (USB) protocol stack of a USB host system are provided. The security arrangements prevent an unauthorized or suspicious USB device from communicating with the host system, detect suspicious activity originating from a device which is already communicating with the host system and may provide notification to a user.

Abstract: An arrangement for installing function drivers that provide communication between computer applications and various peripheral devices employs a master driver that is loaded for each peripheral device. The master drivers receive notification of the connection of the respective peripheral devices and, in time, load the proper function drivers. Each function driver has (1) an interface part that communicates with an application and (2) a peripheral part that communicates with the peripheral device associated with that application. When a device is disconnected, the associated function driver is notified and, in response, the driver discontinues operations of its peripheral part and retains operation of its interface part.