mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
81 lines
2.7 KiB
Groff
81 lines
2.7 KiB
Groff
.\" Copyright (c) 1998, Nicolas Souchu
|
|
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd August 10, 1998
|
|
.Dt SMBUS 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm smbus
|
|
.Nd System Management Bus
|
|
.Sh SYNOPSIS
|
|
.Cd "device smbus"
|
|
.Pp
|
|
.Cd "device iicsmb"
|
|
.Cd "device bktr"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Em smbus
|
|
system provides a uniform, modular and architecture-independent
|
|
system for the implementation of drivers to control various SMB devices
|
|
and to utilize different SMB controllers (I2C, PIIX4, Brooktree848, vm86...).
|
|
.Sh System Management Bus
|
|
The
|
|
.Em System Management Bus
|
|
is a two-wire interface through which simple power-related chips can communicate
|
|
with rest of the system.
|
|
It uses I2C as its backbone (see
|
|
.Xr iicbus 4 ) .
|
|
.Pp
|
|
A system using SMB passes messages to and from devices instead of tripping
|
|
individual control lines.
|
|
.Pp
|
|
With the SMBus, a device can provide manufacturer information, tell the
|
|
system what its model/part number is, save its state for a suspend event,
|
|
report different types of errors, accept control parameters, and return its
|
|
status.
|
|
.Pp
|
|
The SMBus may share the same host device and physical bus as ACCESS bus
|
|
components provided that an appropriate electrical bridge is provided
|
|
between the internal SMB devices and external ACCESS bus devices.
|
|
.Sh SEE ALSO
|
|
.Xr bktr 4 ,
|
|
.Xr iicbus 4 ,
|
|
.Xr iicsmb 4 ,
|
|
.Xr smb 4
|
|
.Rs
|
|
.%T The SMBus specification
|
|
.%O http://www.smbus.org/specs/
|
|
.Re
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
manual page first appeared in
|
|
.Fx 3.0 .
|
|
.Sh AUTHORS
|
|
This
|
|
manual page was written by
|
|
.An Nicolas Souchu .
|