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smbus(4) [netbsd man page]

SMBUS(4)						   BSD Kernel Interfaces Manual 						  SMBUS(4)

smbus -- System Management Bus SYNOPSIS
device smbus device iicsmb device bktr DESCRIPTION
The 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...). System Management Bus The 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 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 physical bus as ACCESS bus components provided that an appropriate electrical bridge is provided between the internal SMB devices and external ACCESS bus devices. SEE ALSO
bktr(4), iicbus(4), iicsmb(4), smb(4) The SMBus specification, HISTORY
The smbus manual page first appeared in FreeBSD 3.0. AUTHORS
This manual page was written by Nicolas Souchu. BSD
August 10, 1998 BSD

Check Out this Related Man Page

VIAPM(4)						   BSD Kernel Interfaces Manual 						  VIAPM(4)

viapm -- VIA chipsets Power Management controller driver SYNOPSIS
device iicbb device iicbus device iicsmb device smbus device smb device viapm DESCRIPTION
This driver provides access to the VIA chipset Power Management Unit family. They are VT82C586B, VT82C596A, VT82C596B, VT82C686A and VT8233. The embedded controller of the VIA chipset may give you access to the monitoring facilities of your mainboard. The 586B support is made by software whereas other controllers support the SMBus protocol by hardware. See smb(4) for writing user code to fetch voltages, temperature and so on from the monitoring chip of your mainboard. SEE ALSO
iicbb(4), iicbus(4), iicsmb(4), smb(4), smbus(4) HISTORY
The viapm manual page first appeared in FreeBSD 4.5. AUTHORS
This manual page was written by Nicolas Souchu <>. BUGS
Only polling mode is supported. BSD
April 20, 2002 BSD
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