1.\" 2.\" Copyright (c) 2011 Hans Petter Selasky. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd April 24, 2018 28.Dt XHCI 4 29.Os 30.Sh NAME 31.Nm xhci 32.Nd USB eXtensible Host Controller driver 33.Sh SYNOPSIS 34.Cd "device xhci" 35.Sh DESCRIPTION 36The 37.Nm 38driver provides support for the 39.Tn USB 40eXtensible Host Controller Interface, 41which allows use of 42.Tn USB 431.0, 2.0 and 3.0 devices on the same 44.Tn USB 45port. 46.Pp 47The 48.Tn XHCI 49controller supports 50.Tn USB 51connection speeds up to 5.0Gbps when using a USB 3.0 compliant device. 52.Sh HARDWARE 53The 54.Nm 55driver supports 56.Tn XHCI 57compatible controllers having PCI class 12 (serial bus), 58subclass 3 (USB) and programming interface 48 (XHCI). 59.Sh SYSCTL VARIABLES 60The following variables are available as both 61.Xr sysctl 8 62variables and 63.Xr loader 8 64tunables: 65.Bl -tag -width indent 66.It Va hw.usb.xhci.debug 67Debug output level, where 0 is debugging disabled and larger values increase 68debug message verbosity. 69Default is 0. 70.El 71.Sh SEE ALSO 72.Xr ehci 4 , 73.Xr ohci 4 , 74.Xr uhci 4 , 75.Xr usb 4 76.Sh HISTORY 77The 78.Nm 79device driver first appeared in 80.Fx 8.2 . 81