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.\"
.\" Copyright (c) 2015 John Baldwin <jhb@FreeBSD.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd February 5, 2015
.Dt DEVCTL 8
.Os
.Sh NAME
.Nm devctl
.Nd device control utility
.Sh SYNOPSIS
.Nm
.Cm attach
.Ar device
.Nm
.Cm detach
.Op Fl f
.Ar device
.Nm
.Cm disable
.Op Fl f
.Ar device
.Nm
.Cm enable
.Ar device
.Nm
.Cm suspend
.Ar device
.Nm
.Cm resume
.Ar device
.Nm
.Cm set driver
.Op Fl f
.Ar device driver
.Sh DESCRIPTION
The
.Nm
utility adjusts the state of individual devices in the kernel's
internal device hierarchy.
Each invocation of
.Nm
consists of a single command followed by command-specific arguments.
Each command operates on a single device specified via the
.Ar device
argument.
The
.Ar device
may be specified either as the name of an existing device or as a
bus-specific address.
More details on supported address formats can be found in
.Xr devctl 3 .
.Pp
The following commands are supported:
.Bl -tag -width indent
.It Cm attach Ar device
Force the kernel to re-probe the device.
If a suitable driver is found,
it is attached to the device.
.It Xo Cm detach
.Op Fl f
.Ar device
.Xc
Detach the device from its current device driver.
If the
.Fl f
flag is specified,
the device driver will be detached even if the device is busy.
.It Xo Cm disable
.Op Fl f
.Ar device
.Xc
Disable a device.
If the device is currently attached to a device driver,
the device driver will be detached from the device,
but the device will retain its current name.
If the
.Fl f
flag is specified,
the device driver will be detached even if the device is busy.
.It Cm enable Ar device
Enable a device.
The device will probe and attach if a suitable device driver is found.
Note that this can re-enable a device disabled at boot time via a
loader tunable.
.It Cm suspend Ar device
Suspend a device.
This may include placing the device in a reduced power state.
.It Cm resume Ar device
Resume a suspended device to a fully working state.
.It Xo Cm set driver
.Op Fl f
.Ar device driver
.Xc
Force the device to use a device driver named
.Ar driver .
If the device is already attached to a device driver and the
.Fl f
flag is specified,
the device will be detached from its current device driver before it is
attached to the new device driver.
If the device is already attached to a device driver and the
.Fl f
flag is not specified,
the device will not be changed.
.El
.Sh SEE ALSO
.Xr devctl 3 ,
.Xr devinfo 8
.Sh HISTORY
The
.Nm
utility first appeared in
.Fx 11.0 .