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				.\"
				.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				.\"
				.\" Copyright (c) 2019 Andriy Gapon <avg@FreeBSD.org>
				.\"
				bruefferUnsubmitted Done Inline Actions This can go. brueffer: This can go.
				.\" Redistribution and use in source and binary forms, with or without
				.\" modification, are permitted provided that the following conditions
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				.\" $FreeBSD$
				.\"
				.Dd October 10, 2019
				.Dt SUPERIO 4
				.Os
				.Sh NAME
				.Nm superio
				.Nd Super I/O controller and bus driver
				.Sh SYNOPSIS
				To compile this driver into the kernel,
				place the following line in your
				kernel configuration file:
				.Bd -ragged -offset indent
				.Cd "device superio"
				.Ed
				.Pp
				Alternatively, to load the driver as a
				module at boot time, place the following line in
				.Xr loader.conf 5 :
				.Bd -literal -offset indent
				superio_load="YES"
				.Ed
				.Sh DESCRIPTION
				Super I/O is an I/O controller that combines various low-bandwidth devices
				that can be functionally unrelated otherwise.
				A typical Super I/O can contain devices such as
				.Bl -bullet -compact
				.It
				a floppy disk controller
				.It
				a parallel port
				.It
				a serial port
				.It
				a PS/2 mouse and keyboard controller
				.It
				a hardware monitoring controller
				.It
				a watchdog timer
				.It
				a controller for general purpose input-output
				.El
				.Pp
				The
				.Nm
				driver provides support for devices residing in the Super I/O controller
				that can only be accessed or discovered using the controller's interface.
				Some of the Super I/O devices have standardized interfaces.
				Such devices either use well-known legacy resources or they are advertised
				via ACPI or both.
				They can be configured either using ISA bus hints or they are auto-aconfigured by
				.Xr acpi 4 .
				The
				.Nm
				driver is not designed to interact with that kind of devices.
				They can be handled by their respective drivers without any knowledge of the
				Super I/O specifics.
				For instance,
				.Xr fdc 4
				provides access to the floppy disk controller.
				.Pp
				There are other Super I/O devices that do not have any standardized interface.
				Drivers for those devices can be written using facilities of the
				.Nm
				driver.
				.Pp
				The driver itself attaches to the ISA bus as all supported controllers are
				accessed via LPC I/O ports.
				.Pp
				The
				.Nm
				driver is unusual as it is both a controller driver for a variety of Super I/O
				controllers and a bus driver for supported devices in those controllers.
				.Sh HARDWARE
				The
				.Nm
				driver supports a multitude of Super I/O controllers produced by Nuvoton,
				formerly known as Winbond, and ITE.
				.Sh SEE ALSO
				.Xr superio 9
				.Sh HISTORY
				The
				bruefferUnsubmitted Done Inline Actions This can be removed, it does nothing here. mandoc -Tlint manpage.4 catches problems like this. brueffer: This can be removed, it does nothing here. mandoc -Tlint manpage.4 catches problems like this.
				.Nm
				driver was written by
				.An Andriy Gapon Aq Mt avg@FreeBSD.org .