feat: Added NetBSD man pages

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+.\" $NetBSD: acpismbus.4,v 1.2 2010/02/06 21:57:08 wiz Exp $
+.\"
+.\" Copyright (c) 2009 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Paul Goyette
+.\"
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 February 6, 2010
+.Dt ACPISMBUS 4
+.Os
+.Sh NAME
+.Nm acpismbus
+.Nd ACPI SMBus Control Method Interface
+.Sh SYNOPSIS
+.Cd "acpismbus* at acpi?"
+.Cd "iic* at acpismbus?"
+.Sh DESCRIPTION
+The
+.Nm
+driver supports instances of the ACPI SMBus Control Method Interface.
+This enables i2c access to bus segments which might not otherwise be
+accessible due to missing "native" driver support.
+The SMBus Process Call protocol is not supported.
+All other SMBus protocols are supported to the extent that the underlying
+controller supports them.
+.Sh SEE ALSO
+.Xr acpi 4 ,
+.Xr iic 4
+.Sh HISTORY
+The
+.Nm
+driver
+appeared in
+.Nx 6.0 .
+.Sh BUGS
+Although
+.Nm
+SMBus Alerts can be associated with individual devices, this
+capability is ignored.
+When an
+.Nm
+SMBus Alert is generated, all devices on the i2c bus segment which have
+registered an interrupt routine are notified.
+.Pp
+The SMBus CMI protocol defines a method to provide a list of devices on an
+i2c bus segment and their addresses.
+The
+.Nm
+driver makes no attempt to retrieve or process this device list.
+.Pp
+There is currently no way to determine if the i2c controller managed by
+an instance of the ACPI SMBus CMI can also be accessed using a native
+device driver.
+Therefore, the
+.Nm
+driver should not be enabled by default.
+If both a native driver and the
+.Nm
+driver attempt to access the same i2c bus segment, the results are
+undefined.