[lm-sensors] [PATCH] lm75: Fix lm75a detection

Jean Delvare khali at linux-fr.org
Fri Apr 18 17:52:22 CEST 2008

On Fri, 18 Apr 2008 17:35:19 +0200, Laurent Pinchart wrote:
> Hi Jean,
> On Friday 18 April 2008 16:10, Jean Delvare wrote:
> > Hello Laurent,
> > 
> > On Wed, 16 Apr 2008 13:34:09 +0200, Laurent Pinchart wrote:
> > > Philips LM75A temperature sensors don't pass the current detection check
> > > as they return 0xffff when reading unimplemented registers instead of the
> > > last read value. This patch modifies device detection to accept 0xffff as
> > > valid values when reading registers 0x04-0x07.
> > 
> > In fact almost no LM75 clone mimics the original behavior perfectly so
> > they all need to be forced with a module parameter at the moment. I
> > have always been reluctant to update the detection code to support them
> > all, as this would weaken it to a point where about any device at any
> > of the 8 supported I2C addresses would be picked.
> >
> > May I ask on which system you have the Philips LM75A chip? If that's an
> > embedded system where you will end up using the new-style lm75 driver,
> > then I'd rather focus on getting this new-style driver ready, instead
> > of updating the detection code.
> This is indeed an embedded system. I'm fine with focussing on getting the
> new-style driver ready.
> Do you have more comments on David's patches ? He mentionned receiving no 
> feedback on his smbalert# patch.

I didn't look at the updated patchset David sent 2 days ago yet. But anyway,
smbalert# support is unrelated to converting the lm75 driver to new-style.
What should get reviewed and integrated quickly are the 2 first patches of
the set. Please test them, and if you have time, please review them. I don't
know when I will have the time for that.

Jean Delvare

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