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From: "Guenter Roeck" <guenter.roeck@xxxxxxxxxxxx>
Sent: Tuesday, February 08, 2011 6:10 PM
To: <lm-sensors@xxxxxxxxxxxxxx>
Subject: tempX_source sysfs attribute needed ?
Hi all,
in the recent months, I have seen two instances where a sysfs attribute
identifying the source associated with a temperature sensor would have
been
helpful.
One is max6639. For this chip, the source of the second temperature
channel
can be configured to be local or remote.
The others are W83677HG-B, NCT6775F, and NCT6776F. Those chips have four
to six
temperature channels with a configurable source.
Current approach is to stick with whatever is configured by the BIOS for
the Nuvoton
chips, and to use the local source for the max6639 driver. For the Nuvoton
chips,
my prototype driver for NCT6775F and NCT6776F reports the temperature
source
in tempX_label.
Possible solutions might be:
- Stick with the current situation, ie do nothing.
- Use module parameters. Doesn't really work well for max6639 since it
affects
all instances of the driver, and if the driver is built into the kernel.
- Use platform data. Might work for max6639, but not for the Nuvoton
chips.
- Define a new sysfs attribute to make the temperature source
configurable,
and to report the current selection.
Any thoughts/comments ?
Thanks,
Guenter
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Hi Guenter,
I actually think it's a good idea (tempX_label), I've already seen that
sensors can use this information if you don't have a label defined in
sensors3.conf. It actually makes is alot easier to configure the
sensors3.conf file correctly. I'm not sure if _label is the correct name, it
really describes the source of the signal.
Also with the nuv chips what happens if you change the source for a
temperature input that's used by smartfan? The BIOS should know what's best
and playing with the fan control inputs could cause all sorts of problems.
During my hacking in the nct6776f driver I managed to screw up the smartfan
control so much that the temperature setpoint for one of the fans was 90°c
and the fan stopped.
Regards
Ian Dobson
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