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. > I use the select/deselect mechanism to trigger arbitration, but I still need > a mechanism to communicate between the masters. After all, the problem to solve > is that I have two masters and one slave, not one master and multiple slaves > as with the other chips. > > Note that I do have a solution which I think will work. Just figured it might > save time if someone else already solved the same problem, and especially it > might help me to determine arbitration time constants. There was mention of > a pca9541 driver several years ago, but I have not been able to find details. -- Jean Delvare -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
