4afdfe9761
The driver currently supports chips that are fully compliant with the JEDEC SPD / EEPROM / TS standard (JEDEC Standard 21-C, TSE2002 Specification, frequenlty referred to as JEDEC JC 42.4). Additionally some chips from STMicroelectronics are supported as well. They are compliant except for their Device ID pattern. Given the continued lack of any common sensor infrastructure, the driver uses an ad-hoc sysctl to report the temperature. Reviewed by: wblock (documentation) MFC after: 2 weeks Relnotes: yes Differential Revision: https://reviews.freebsd.org/D8174
131 lines
3.5 KiB
Groff
131 lines
3.5 KiB
Groff
.\"
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.\" Copyright (c) 2016 Andriy Gapon <avg@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 October 13, 2016
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.Dt JEDEC_TS 4
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.Os
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.Sh NAME
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.Nm jedec_ts
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.Nd driver for temperature sensors on memory modules
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.Sh SYNOPSIS
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.Bd -ragged -offset indent
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.Cd "device jedec_ts"
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.Cd "device smbus"
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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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jedec_ts_load="YES"
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.Ed
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.Pp
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In
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.Pa /boot/device.hints :
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.Bd -literal -offset indent
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.Cd hint.jedec_ts.0.at="smbus0"
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.Cd hint.jedec_ts.0.addr="0x30"
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.Cd hint.jedec_ts.1.at="smbus0"
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.Cd hint.jedec_ts.1.addr="0x32"
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.Cd hint.jedec_ts.2.at="smbus0"
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.Cd hint.jedec_ts.2.addr="0x34"
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.Cd hint.jedec_ts.3.at="smbus0"
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.Cd hint.jedec_ts.3.addr="0x36"
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.Cd hint.jedec_ts.4.at="smbus0"
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.Cd hint.jedec_ts.4.addr="0x38"
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.Cd hint.jedec_ts.5.at="smbus0"
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.Cd hint.jedec_ts.5.addr="0x3A"
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.Cd hint.jedec_ts.6.at="smbus0"
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.Cd hint.jedec_ts.6.addr="0x3C"
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.Cd hint.jedec_ts.7.at="smbus0"
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.Cd hint.jedec_ts.7.addr="0x3E"
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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 provides access to sensor data over the
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.Xr smbus 4 .
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The driver supports temperature sensors on memory modules that conform
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to JEDEC Standard 21-C, TSE2002 Specification.
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.Pp
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The access to
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.Nm
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data is made via the
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.Xr sysctl 8
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interface:
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.Bl -tag -width "dev.jedec_ts.%d.temp"
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.It Va dev.jedec_ts.%d.temp
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read-only value of the current temperature read by the sensor.
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.El
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.Pp
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On a system using
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.Xr device.hints 5 ,
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these values are configurable for
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.Nm :
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.Bl -tag -width "hint.jedec_ts.%d.addr"
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.It Va hint.jedec_ts.%d.at
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target
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.Xr smbus 4 .
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.It Va hint.jedec_ts.%d.addr
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.Nm
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SMBus address on the
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.Xr smbus 4 .
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.El
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.Pp
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.Nm
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temperature sensors can be wired to eight different addresses,
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allowing up to eight sensors on the same
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.Xr smbus 4 .
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.Pp
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If the sensors are on an I2C bus behind an
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.Xr iicbus 4
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controller, then the
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.Xr iicsmb 4
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bridge driver can be used to attach the
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.Xr smbus 4 .
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.Sh EXAMPLES
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.Ss Sensor read out for two memory modules:
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.Bd -literal
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dev.jedec_ts.0.temp: 40.2500C
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dev.jedec_ts.1.temp: 40.7500C
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.Ed
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.Sh SEE ALSO
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.Xr iicbus 4 ,
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.Xr iicsmb 4 ,
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.Xr smbus 4 ,
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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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driver first appeared in
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.Fx 12.0 .
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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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driver and this manual page were written by
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.An Andriy Gapon Aq Mt avg@FreeBSD.org .
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