107 lines
3.2 KiB
Groff
107 lines
3.2 KiB
Groff
.\" Copyright (c) 2011 Henrik Brix Andersen <brix@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 15, 2011
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.Dt GLXIIC 4 i386
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.Os
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.Sh NAME
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.Nm glxiic
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.Nd Geode LX CS5536 I2C controller driver
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device pci"
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.Cd "device isa"
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.Cd "device glxiic"
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.Cd "device iicbus"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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glxiic_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver supports the System Management Bus controller of the Geode LX
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series CS5536 Companion Device. The Geode LX is a member of the AMD
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Geode family of integrated x86 system chips.
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.Pp
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Although AMD refers to this device as a System Management Bus (SMBus)
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controller, it is really an I2C controller (it lacks SMBus ALERT# and
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Alert Response support).
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.Pp
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The
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.Nm
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driver supports both I2C master and slave mode.
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.Sh SYSCTL VARIABLE
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The
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.Nm
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driver supports the following variable as both
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.Xr sysctl 8
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and
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.Xr loader 8
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tunable:
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.Bl -tag -width indent
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.It Va dev.glxiic.0.timeout
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This variable controls the I2C bus timeout in milliseconds. The
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default timeout is 35 milliseconds. A value of zero disables the
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timeout.
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.El
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.Sh CAVEAT
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The
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.Nm
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driver uses the interrupt line number configured by the board firmware
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by default. If no interrupt line number has been configured by the
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board firmware (or to override the interrupt line number configured by
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board firmware), place the following line in
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.Xr device.hints 5 :
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.Bd -ragged -offset indent
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hint.glxiic.0.irq="10"
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.Ed
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.Pp
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The interrupt line number must be between 1 and 15.
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.Sh SEE ALSO
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.Xr iicbus 4 ,
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.Xr device.hints 5 ,
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.Xr loader.conf 5 ,
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.Xr loader 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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device driver and manual page first appeared in
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.Fx 9.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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device driver and manual page were written by
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.An Henrik Brix Andersen Aq brix@FreeBSD.org .
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