[lm-sensors] Philips PCA9540 sensor not included ?

Jean Delvare khali at linux-fr.org
Sun Sep 2 17:43:49 CEST 2007

Hi Alex,

On Sat, 1 Sep 2007 08:54:16 +0000 (GMT), Alex wrote:
> My pc motherboard (DFI Infinity) is equipped with a PCA9540
> I2C device.
> I use Ubuntu 7.04 with original kernel 2.6.20
> sensor-detect detects it but module is not present in kernel
> tree (in drivers/i2c/chips/ ) but there is a pca9539.c (useless).

The PCA9540 is not a sensor chip, it's an I2C bus multiplexer. It's
very difficult to detect, BTW, so it is entirely possible that
sensors-detect got it wrong. Do you have any reason to believe that you
really have a PCA9540 on your system?

> I've found this post
> http://lists.lm-sensors.org/pipermail/lm-sensors/2006-March/015743.html
> that propose the code for pca954x .
> Just now I'm trying to recompile my kernel with this patch.
> There is a chance that code for pca954x will be included in future ?

This is a question for the i2c list.

Jean Delvare

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