Universal serial bus smart hub
View Patent ↗A USB smart hub may provide enhanced battery charging, data storage security, vendor matching, device authentication, data capture/debug, and role switching. The smart hub may include an upstream port, a plurality of downstream ports, a processor, and a memory coupled to the processor for storing USB host stack code and configuration parameters. The smart hub may include a USB hub core having a core to implement a standard USB hub interface. The smart hub may include a plurality of 2:1 multiplexors coupled between the downstream ports, the core downstream ports, and the processor. The processor may control the 2:1 multiplexors. The processor may be configured to detect when a USB device is coupled to a downstream port and to run the USB host stack code and to enumerate the USB device. The processor may provide enhanced features based on the configuration parameters.
1. A method for providing vendor device preference in a USB hub including a plurality of hub downstream ports and a processor running USB host stack code, comprising:
the processor detecting a USB device is coupled to a first one of the plurality of hub downstream ports;
the processor enumerating the USB device;
the processor obtaining a product ID (PID) and a vendor ID (VID) from the USB device;
the processor using the PID and the VID to determine that the USB device is not from a preferred vendor; and
the processor causing the USB device to enumerate with a sub-optimal configuration upon determining that the USB device is not from a preferred vendor;
wherein the sub-optimal configuration is one or more of: a sub-optimal power configuration and a sub-optimal speed configuration.
2. A USB hub comprising:
a hub upstream port;
a plurality of hub downstream ports;
a processor;
a memory communicatively coupled to the processor for storing USB host stack code and a plurality of configuration parameters;
a USB hub core having a core upstream port and a plurality of core downstream ports, the USB hub core operable to implement a USB hub interface between the core upstream port and the plurality of core downstream ports; and
a plurality of multiplexors, each multiplexor having:
a first port communicatively coupled to one of the hub downstream ports,
a second port communicatively coupled to one of the plurality of core downstream ports,
a third port communicatively coupled to the processor, and
a select input communicatively coupled to the processor and operable to communicatively couple the first port with the second port, the third port, or both the second port and the third port;
wherein the processor is configured:
to detect when a USB device is coupled to a first one of the plurality of hub downstream ports;
to control the select input of a first multiplexor corresponding to the first hub downstream port so that the first port is connected to the third port;
to run the USB host stack code, to enumerate the USB device;
obtain a product ID (PID) and a vendor ID (VID) from the USB device;
use the PID and the VID to determine that the USB device is not from a preferred vendor; and
based on determining that the USB device is not from a preferred vendor, cause the USB device to enumerate with a sub-optimal configuration;
wherein the sub-optimal configuration is one or more of: a sub-optimal power configuration and a sub-optimal speed configuration.
3. The USB hub according to claim 2 , wherein after enumerating the USB device, the processor is further configured to cause the USB device to be enumerated by an upstream USB host coupled to the hub upstream port.