2 .\" Copyright (c) 2014 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
39 .Nm devctl_set_driver ,
41 .Nd device control library
47 .Fn devctl_attach "const char *device"
49 .Fn devctl_detach "const char *device" "bool force"
51 .Fn devctl_disable "const char *device" "bool force_detach"
53 .Fn devctl_enable "const char *device"
55 .Fn devctl_rescan "const char *device"
57 .Fn devctl_resume "const char *device"
59 .Fn devctl_set_driver "const char *device" "const char *driver" "bool force"
61 .Fn devctl_suspend "const char *device"
65 library adjusts the state of devices in the kernel's internal device
67 Each control operation accepts a
69 argument that identifies the device to adjust.
72 may be specified as either the name of an existing device or as a
74 The following bus-specific address formats are currently supported:
75 .Bl -tag -offset indent
76 .It Sy pci Ns Fa domain Ns : Ns Fa bus Ns : Ns Fa slot Ns : Ns Fa function
77 A PCI device with the specified
83 .It Sy pci Ns Fa bus Ns : Ns Fa slot Ns : Ns Fa function
84 A PCI device in domain zero with the specified
90 A device with an ACPI handle of
92 The handle must be specified as an absolute path and must begin with a
98 function probes a device and attaches a suitable device driver if one is
103 function detaches a device from its current device driver.
104 The device is left detached until either a new driver for its parent
105 bus is loaded or the device is explicitly probed via
110 the current device driver will be detached even if the device is busy.
114 function disables a device.
115 If the device is currently attached to a device driver,
116 the device driver will be detached from the device,
117 but the device will retain its current name.
121 the current device driver will be detached even if the device is busy.
122 The device will remain disabled and detached until it is explicitly enabled
128 function re-enables a disabled device.
129 The device will probe and attach if a suitable device driver is found.
133 function suspends a device.
134 This may include placing the device in a reduced power state,
135 but any device driver currently attached to the device will remain attached.
139 function resumes a suspended device to a fully working state.
142 .Fn devctl_set_driver
143 function attaches a device driver named
146 If the device is already attached and
149 the request will fail.
150 If the device is already attached and
153 the device will be detached from its current device driver before it is
154 attached to the new device driver.
158 function rescans a bus device checking for devices that have been added or
161 .Rv -std devctl_attach devctl_detach devctl_disable devctl_enable \
162 devctl_suspend devctl_rescan devctl_resume devctl_set_driver
164 In addition to specific errors noted below,
167 functions may fail for any of the errors described in
172 The device name is too long.
174 No existing device matches the specified name or location.
176 The current process is not permitted to adjust the state of
182 function may fail if:
185 The device is already attached.
187 An internal memory allocation request failed.
189 The device is disabled.
191 No suitable driver for the device could be found,
192 or the driver failed to attach.
197 function may fail if:
200 The current device driver for
202 is busy and cannot detach at this time.
203 Note that some drivers may return this even if
207 The device is not attached to a driver.
209 The current device driver for
211 does not support detaching.
216 function may fail if:
219 The device is already enabled.
221 An internal memory allocation request failed.
223 No suitable driver for the device could be found,
224 or the driver failed to attach.
229 function may fail if:
232 The current device driver for
234 is busy and cannot detach at this time.
235 Note that some drivers may return this even if
239 The device is already disabled.
241 The current device driver for
243 does not support detaching.
248 function may fail if:
251 The device is already suspended.
253 The device to be suspended is the root bus device.
258 function may fail if:
261 The device is not suspended.
263 The device to be resumed is the root bus device.
267 .Fn devctl_set_driver
268 function may fail if:
271 The device is currently attached to a device driver and
275 The current device driver for
277 is busy and cannot detach at this time.
281 argument points outside the process' allocated address space.
283 No device driver with the requested name exists.
285 An internal memory allocation request failed.
287 The device is disabled.
289 The new device driver failed to attach.
294 function may fail if:
297 The device is not attached to a driver.
299 The bus driver does not support rescanning.
308 library first appeared in
311 If a device is suspended individually via
313 and the entire machine is subsequently suspended,
314 the device will be resumed when the machine resumes.