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xhci — USB eXtensible Host Controller driver
The xhci driver provides support for the USB eXtensible Host Controller Interface, which allows use of USB 1.0, 2.0 and 3.0 devices on the same USB port. The XHCI controller supports USB connection speeds up to 5.0Gbps when using a USB 3.0 compliant device.
The xhci driver supports XHCI compatible controllers having PCI class 12 (serial bus), subclass 3 (USB) and programming interface 48 (XHCI).
The following variables are available as both sysctl(8) variables and loader(8) tunables: hw.usb.xhci.debug Debug output level, where 0 is debugging disabled and larger values increase debug message verbosity. Default is 0.
The xhci device driver first appeared in FreeBSD 8.2.