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 August 10, 1998 .Dt SMBBUS 4 .Os FreeBSD .Sh NAME .Nm smbus .Nd System Management Bus .Sh SYNOPSIS .Cd "controller smbus"
p .Cd "device iicsmb0 at iicbus?" .Cd "device bktr0" .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 ). A system using SMB passes messages to and from devices instead of tripping individual control lines. 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. The SMBus may share the same host device and phusical bus as ACCESS bus componants provided that an appropriate electrival bridge is provided between the internal SMB devices and esternal ACCESS bus devices. .Sh SEE ALSO .Xr iicbus 4 , .Xr iicsmb 4 , .Xr bktr 4 , .Xr smb 4 .Sh HISTORY The .Nm manual page first appeared in .Fx 3.0 . .Sh AUTHOR This manual page was written by .An Nicolas Souchu .