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33 .Nd device control utility
73 utility adjusts the state of individual devices in the kernel's
74 internal device hierarchy.
77 consists of a single command followed by command-specific arguments.
78 Each command operates on a single device specified via the
83 may be specified either as the name of an existing device or as a
85 More details on supported address formats can be found in
88 The following commands are supported:
89 .Bl -tag -width indent
90 .It Cm attach Ar device
91 Force the kernel to re-probe the device.
92 If a suitable driver is found,
93 it is attached to the device.
98 Detach the device from its current device driver.
102 the device driver will be detached even if the device is busy.
108 If the device is currently attached to a device driver,
109 the device driver will be detached from the device,
110 but the device will retain its current name.
114 the device driver will be detached even if the device is busy.
115 .It Cm enable Ar device
117 The device will probe and attach if a suitable device driver is found.
118 Note that this can re-enable a device disabled at boot time via a
120 .It Cm suspend Ar device
122 This may include placing the device in a reduced power state.
123 .It Cm resume Ar device
124 Resume a suspended device to a fully working state.
129 Force the device to use a device driver named
131 If the device is already attached to a device driver and the
134 the device will be detached from its current device driver before it is
135 attached to the new device driver.
136 If the device is already attached to a device driver and the
138 flag is not specified,
139 the device will not be changed.
140 .It Xo Cm clear driver
144 Clear a previously-forced driver name so that the device is able to use any
146 After the previous name has been cleared,
147 the device is reprobed so that other device drivers may attach to it.
148 This can be used to undo an earlier
151 If the device is currently attached to a device driver and the
153 flag is not specified,
154 the device will not be changed.
155 .It Cm rescan Ar device
156 Rescan a bus device checking for devices that have been added or
162 Delete the device from the device tree.
166 the device will be deleted even if it is physically present.
167 This command should be used with care as a device that is deleted but present
168 can no longer be used unless the parent bus device rediscovers the device via
177 utility first appeared in