Re: udev-043

[Kay Sievers <kay.sievers@vrfy.org>]

On Mon, 2004-11-08 at 13:18 -0800, Greg KH wrote:
> On Mon, Nov 08, 2004 at 10:00:54PM +0100, Kay Sievers wrote:
> > On Sun, 2004-11-07 at 04:49 +0100, Michael Geithe wrote:
> > > Hi,
> > > 
> > > only one udev-message found in my logs ;-)
> > > 
> > > wait_for_sysfs[10013]: either wait_for_sysfs (udev 043) needs an update to 
> > > handle the device '/class/i2c-dev/i2c-2' properly (no bus device link) or the 
> > > sysfs-support of your device's driver needs to be fixed, please report to 
> > > <linux-hotplug-devel@lists.sourceforge.net>
> > > 
> > 
> > class:  /sys/class/i2c-dev/i2c-2/
> > device: /sys/devices/platform/i2c-2
> > bus:    /sys/bus/i2c/devices/2-0290
> 
> Where do you get this "bus:" info from?

I extracted it from Michael's post:
>
> ls -l /sys/bus/i2c/devices
  ...
> 7. Nov 03:53 2-0290 -> ../../../devices/platform/i2c-2/2-0290
>

> > Hmm, looks like the "device" link should point to:
> > 
> >   /sys/devices/platform/i2c-2/2-0290
> > 
> > instead, to match the bus link.
> 
> No, the i2c-2 class device points to the i2c-2 adapter device.  Now,
> that adapter device can "find" a number of individual i2c chip devices
> that i2c chip drivers can then bind to.  Those chip devices are the
> "2-0290" and such devices.
> 
> Make more sense?  Yeah, it's a mess, sorry, but the i2c code isn't the
> nicest either :)

I know nothing about i2c. :)

Hmm, so libsysfs should look for the "bus" at the parent of
the /sys/devices/ device to get the "bus" of _this_ device?

Or should there be one /sys/bus/devices link for every "chip" created by
the kernel?

Kay



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