Re: Driver for pca9541 bus master selector

[Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>]

Hi Jean,

On Tue, Sep 28, 2010 at 12:42:15PM -0400, Jean Delvare wrote:
> On Tue, 28 Sep 2010 09:07:46 -0700, Guenter Roeck wrote:
> > On Tue, Sep 28, 2010 at 11:16:07AM -0400, Jean Delvare wrote:
> > > Hi Guenter,
> > > 
> > > On Tue, 28 Sep 2010 07:33:02 -0700, Guenter Roeck wrote:
> > > > I am in the process of writing a driver for the pca9541 bus master selector. 
> > > > I using the i2c multiplexer framework, which fits the requirements quite nicely.
> > > > 
> > > > If anyone happens to know about an existing driver for this chip, please let me know.
> > > > I would love to get some input for the arbitration mechanism needed to determine
> > > > if and when to switch bus ownership from one master to the other.
> > > 
> > > See drivers/i2c/muxes/pca954x.c in 2.6.36-rc2 and later.
> > > 
> > Yes, I know. I use it as basis. But it doesn't support pca9541, unfortunately.
> 
> Oh, my bad. I had not noticed the PCA9541 was of a totally different kind.
> 
Actually, I fell into the same trap. I was quite happy that someone else wrote 
the driver for me ... until I realized that the chips solve the opposite problem.

Time goes by ... have a look at

http://lists.lm-sensors.org/pipermail/lm-sensors/2004-June/008023.html

I wasn't sure if you (or someone else) ever had a driver for 9541, or if you referred
to 9540 in above post. The links in the post don't work anymore.

Thanks,
Guenter