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.\"-
.\" SPDX-License-Identifier: BSD-2-Clause
.\"
.\" Copyright (c) 2009 Michael Gmelin
.\" 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.
.\"
.Dd June 12, 2025
.Dt ACPI_WMI 4
.Os
.Sh NAME
.Nm acpi_wmi
.Nd ACPI to WMI mapping driver
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following line in your
kernel configuration file:
.Pp
.Dl Cd "device acpi_wmi"
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Pp
.Dl acpi_wmi_load="YES"
.Sh DESCRIPTION
The
.Nm
driver provides an interface for vendor specific WMI implementations
.Pq e.g. HP and Acer laptops .
It creates
.Pa /dev/wmistat%d ,
which can be read to get information about GUIDs found in the system.
.Sh FILES
.Bl -tag -width /dev/wmistat%d -compact
.It Pa /dev/wmistat%d
WMI status devices.
.El
.Sh SYSCTLS
The following sysctl node is currently implemented:
.Bl -tag -width "dev.acpi_wmi.%d.bmof"
.It Va dev.acpi_wmi.%d.bmof
binary Managed Object Format (MOF) buffer
.El
.Sh EXAMPLES
Read GUIDs from the first WMI interface found in the system:
.Bd -literal
# cat /dev/wmistat0
GUID INST EXPE METH STR EVENT OID
{5FB7F034-2C63-45E9-BE91-3D44E2C707E4} 1 NO WMAA NO NO AA
{95F24279-4D7B-4334-9387-ACCDC67EF61C} 1 NO NO NO 0x80+ -
{2B814318-4BE8-4707-9D84-A190A859B5D0} 1 NO NO NO 0xA0 -
{05901221-D566-11D1-B2F0-00A0C9062910} 1 NO NO NO NO AB
{1F4C91EB-DC5C-460B-951D-C7CB9B4B8D5E} 1 NO WMBA NO NO BA
{2D114B49-2DFB-4130-B8FE-4A3C09E75133} 57 NO NO NO NO BC
{988D08E3-68F4-4C35-AF3E-6A1B8106F83C} 20 NO NO NO NO BD
{14EA9746-CE1F-4098-A0E0-7045CB4DA745} 1 NO NO NO NO BE
{322F2028-0F84-4901-988E-015176049E2D} 2 NO NO NO NO BF
{8232DE3D-663D-4327-A8F4-E293ADB9BF05} 0 NO NO NO NO BG
{8F1F6436-9F42-42C8-BADC-0E9424F20C9A} 0 NO NO NO NO BH
{8F1F6435-9F42-42C8-BADC-0E9424F20C9A} 0 NO NO NO NO BI
.Ed
.Pp
Read first WMI interface description with
.Sy bmf2mof
from
.Pa ports/converters/bmfdec :
.Bd -literal
# sysctl -b dev.acpi_wmi.0.bmof | bmf2mof
[abstract]
class Lenovo_BIOSElement {
};
[WMI, Dynamic, Provider("WMIProv"), WmiExpense(1), Description("Bios Setting"),
GUID("{51F5230E-9677-46cd-A1CF-C0B23EE34DB7}"), Locale("MS\\0x409")]
class Lenovo_BiosSetting : Lenovo_BiosElement {
[key, read] String InstanceName;
[read] Boolean Active;
[WmiDataId(1), Description("BIOS setting")] String CurrentSetting;
};
...
.Ed
.Sh SEE ALSO
.Xr acpi 4
.Sh STANDARDS
.Rs
.%T Windows Instrumentation: WMI and ACPI
.%I Microsoft Corporation
.%U https://github.com/microsoft/Windows-driver-samples/tree/main/wmi/wmiacpi
.Re
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 8.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Michael Gmelin Aq Mt freebsd@grem.de .
.Pp
Work inspired by the Linux
.Sy acpi-wmi
driver written by Carlos Corbacho.
.Pp
MOF handling inspired by the Linux
.Sy wmi-bmof
driver written by Andy Lutomirski.
.Pp
This manual page was written by
.An Michael Gmelin Aq Mt freebsd@grem.de .
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