mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
112 lines
4.1 KiB
Text
112 lines
4.1 KiB
Text
|
Kernel driver adm1021
|
||
|
|
=====================
|
||
|
|
|
||
|
|
Supported chips:
|
||
|
|
* Analog Devices ADM1021
|
||
|
|
Prefix: 'adm1021'
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the Analog Devices website
|
||
|
|
* Analog Devices ADM1021A/ADM1023
|
||
|
|
Prefix: 'adm1023'
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the Analog Devices website
|
||
|
|
* Genesys Logic GL523SM
|
||
|
|
Prefix: 'gl523sm'
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet:
|
||
|
|
* Intel Xeon Processor
|
||
|
|
Prefix: - any other - may require 'force_adm1021' parameter
|
||
|
|
Addresses scanned: none
|
||
|
|
Datasheet: Publicly available at Intel website
|
||
|
|
* Maxim MAX1617
|
||
|
|
Prefix: 'max1617'
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the Maxim website
|
||
|
|
* Maxim MAX1617A
|
||
|
|
Prefix: 'max1617a'
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the Maxim website
|
||
|
|
* National Semiconductor LM84
|
||
|
|
Prefix: 'lm84'
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the National Semiconductor website
|
||
|
|
* Philips NE1617
|
||
|
|
Prefix: 'max1617' (probably detected as a max1617)
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the Philips website
|
||
|
|
* Philips NE1617A
|
||
|
|
Prefix: 'max1617' (probably detected as a max1617)
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the Philips website
|
||
|
|
* TI THMC10
|
||
|
|
Prefix: 'thmc10'
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the TI website
|
||
|
|
* Onsemi MC1066
|
||
|
|
Prefix: 'mc1066'
|
||
|
|
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
|
||
|
|
Datasheet: Publicly available at the Onsemi website
|
||
|
|
|
||
|
|
|
||
|
|
Authors:
|
||
|
|
Frodo Looijaard <frodol@dds.nl>,
|
||
|
|
Philip Edelbrock <phil@netroedge.com>
|
||
|
|
|
||
|
|
Module Parameters
|
||
|
|
-----------------
|
||
|
|
|
||
|
|
* read_only: int
|
||
|
|
Don't set any values, read only mode
|
||
|
|
|
||
|
|
|
||
|
|
Description
|
||
|
|
-----------
|
||
|
|
|
||
|
|
The chips supported by this driver are very similar. The Maxim MAX1617 is
|
||
|
|
the oldest; it has the problem that it is not very well detectable. The
|
||
|
|
MAX1617A solves that. The ADM1021 is a straight clone of the MAX1617A.
|
||
|
|
Ditto for the THMC10. From here on, we will refer to all these chips as
|
||
|
|
ADM1021-clones.
|
||
|
|
|
||
|
|
The ADM1021 and MAX1617A reports a die code, which is a sort of revision
|
||
|
|
code. This can help us pinpoint problems; it is not very useful
|
||
|
|
otherwise.
|
||
|
|
|
||
|
|
ADM1021-clones implement two temperature sensors. One of them is internal,
|
||
|
|
and measures the temperature of the chip itself; the other is external and
|
||
|
|
is realised in the form of a transistor-like device. A special alarm
|
||
|
|
indicates whether the remote sensor is connected.
|
||
|
|
|
||
|
|
Each sensor has its own low and high limits. When they are crossed, the
|
||
|
|
corresponding alarm is set and remains on as long as the temperature stays
|
||
|
|
out of range. Temperatures are measured in degrees Celsius. Measurements
|
||
|
|
are possible between -65 and +127 degrees, with a resolution of one degree.
|
||
|
|
|
||
|
|
If an alarm triggers, it will remain triggered until the hardware register
|
||
|
|
is read at least once. This means that the cause for the alarm may already
|
||
|
|
have disappeared!
|
||
|
|
|
||
|
|
This driver only updates its values each 1.5 seconds; reading it more often
|
||
|
|
will do no harm, but will return 'old' values. It is possible to make
|
||
|
|
ADM1021-clones do faster measurements, but there is really no good reason
|
||
|
|
for that.
|
||
|
|
|
||
|
|
Xeon support
|
||
|
|
------------
|
||
|
|
|
||
|
|
Some Xeon processors have real max1617, adm1021, or compatible chips
|
||
|
|
within them, with two temperature sensors.
|
||
|
|
|
||
|
|
Other Xeons have chips with only one sensor.
|
||
|
|
|
||
|
|
If you have a Xeon, and the adm1021 module loads, and both temperatures
|
||
|
|
appear valid, then things are good.
|
||
|
|
|
||
|
|
If the adm1021 module doesn't load, you should try this:
|
||
|
|
modprobe adm1021 force_adm1021=BUS,ADDRESS
|
||
|
|
ADDRESS can only be 0x18, 0x1a, 0x29, 0x2b, 0x4c, or 0x4e.
|
||
|
|
|
||
|
|
If you have dual Xeons you may have appear to have two separate
|
||
|
|
adm1021-compatible chips, or two single-temperature sensors, at distinct
|
||
|
|
addresses.
|