Re: Q re /proc/bus/i2c

["J. Ryan Earl" <heretic@clanhk.org>]

Martin Schlemmer wrote:

>On Sat, 2004-01-10 at 13:58, J. Ryan Earl wrote:
>  
>
>>>A couple questions:
>>>
>>>1) Have you installed the lm-sensors package?
>>>2) What kernel version?
>>>
>>>Even with 2.6, you need to install the lm-sensors package, but not the 
>>>i2c package as the kernel already has everything needed in it.  The 
>>>lm-sensors packages contains drivers for all the sensor chips.  After 
>>>you get lm-sensors installed on your current kernel, run sensors-detect 
>>>to get the proper modules loaded for your hardware.
>>>
>>>      
>>>
>
>Uhm, AFIAK, you should _NOT_ install the drivers from the lm-sensors
>package, but use those in the kernel.  Check the docs, they explicitly
>say that you should only do:
>
>  # make user user_install
>
>if you have 2.6 kernel.  Further, you do not _need_ lm-sensors package,
>as if you only want to check/monitor one setting, you can get it from
>/sys, and if you use gkrellm, it do not even use libsensors anymore
>(and thus works without, as it have since 2.6 support, before even
>libsensors was ported to understand sysfs) ...
>  
>
It still uses devfs I think.  Or you can just run the mkdev.sh command 
to create the proper devices.

This is from installing lm-sensors:

 * *****************************************************************
 *
 * This ebuild assumes your /usr/src/linux kernel is the one you
 * used to build i2c-2.8.2.
 *
 * For 2.5+ series kernels, use the support already in the kernel
 * under 'Character devices' -> 'I2C support' and then merge this
 * ebuild.
 *
 * To cross-compile, 'export LINUX="/lib/modules/<version>/build"'
 * or symlink /usr/src/linux to another kernel.
 *
 * *****************************************************************

You always need the lm-sensors package, period--it has all the user land 
utilities plus drivers for most of the chips/sensors.  You only need the 
i2c package on earlier kernels, use built in for 2.6.  On my Asus 
boards, I use the asb100 module which is not in the kernel.  `find 
/usr/src/linux -name asb100* -print`  Not there.  Remember, you'll have 
to recompile the lm-sensors package everytime you upgrade you change 
your kernel.

-ryan