2 .\" Copyright (c) 2015 John Baldwin <jhb@FreeBSD.org>
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer.
10 .\" 2. Redistributions in binary form must reproduce the above copyright
11 .\" notice, this list of conditions and the following disclaimer in the
12 .\" documentation and/or other materials provided with the distribution.
14 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 .Nd device control utility
69 utility adjusts the state of individual devices in the kernel's
70 internal device hierarchy.
73 consists of a single command followed by command-specific arguments.
74 Each command operates on a single device specified via the
79 may be specified either as the name of an existing device or as a
81 More details on supported address formats can be found in
84 The following commands are supported:
85 .Bl -tag -width indent
86 .It Cm attach Ar device
87 Force the kernel to re-probe the device.
88 If a suitable driver is found,
89 it is attached to the device.
94 Detach the device from its current device driver.
98 the device driver will be detached even if the device is busy.
104 If the device is currently attached to a device driver,
105 the device driver will be detached from the device,
106 but the device will retain its current name.
110 the device driver will be detached even if the device is busy.
111 .It Cm enable Ar device
113 The device will probe and attach if a suitable device driver is found.
114 Note that this can re-enable a device disabled at boot time via a
116 .It Cm suspend Ar device
118 This may include placing the device in a reduced power state.
119 .It Cm resume Ar device
120 Resume a suspended device to a fully working state.
125 Force the device to use a device driver named
127 If the device is already attached to a device driver and the
130 the device will be detached from its current device driver before it is
131 attached to the new device driver.
132 If the device is already attached to a device driver and the
134 flag is not specified,
135 the device will not be changed.
136 .It Cm rescan Ar device
137 Rescan a bus device checking for devices that have been added or
143 Delete the device from the device tree.
147 the device will be deleted even if it is physically present.
148 This command should be used with care as a device that is deleted but present
149 can no longer be used unless the parent bus device rediscovers the device via
158 utility first appeared in