libifp and the new udev (was: Re: PCMCIA & udev changes)

Bill Nottingham notting at redhat.com
Fri Jul 15 21:05:34 UTC 2005


Ignacio Vazquez-Abrams (ivazquez at ivazquez.net) said: 
> Apparently udev can't see them.
> 
> "The first thing you need to do is find a directory somewhere in /sys
> that corresponds to your hardware, and includes a file named "dev", as
> udevinfo can only work on directories of this type. These directories
> are all found under either /sys/block or /sys/class - there is no point
> looking anywhere else!"
> 
> User-mode drivers don't give the device a block or class designator, and
> so udev won't handle them.

Sure it will.

At the end of udev.rules:

ACTION=="add", SUBSYSTEM=="usb", MODALIAS=="*", \
        RUN+="/sbin/modprobe $modalias"

This gets run for all usb devices to *try* and load a driver. It's running
before the kernel could know whether or not a driver is kenrel or
userspace.

Perhaps the udev docs need some help.

Bill




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