mdev and usb device node creation

Dallas Clement dallas.a.clement at gmail.com
Wed Mar 11 04:04:27 UTC 2015


On Tue, Mar 10, 2015 at 6:07 PM, Harald Becker <ralda at gmx.de> wrote:

> Hi Dallas !
>
> > Hi Harald, I was sort of expecting a mdev scan to discover and create
> device nodes for usb.
> > Sounds like I need some rules defined in /etc/mdev.conf.  I just have a
> default one.
>
> What consider you a default one? There are so many distros and systems out
> in the wild, even the Busybox snapshot archives contain two or three
> different mdev configurations (as examples). SO I can't tell you anything
> specific, without seeing what your configuration describes.
>
> mdev either scans /sys/class/... for devices entries or picks up hotplug
> event messages, then search the /etc/mdev.conf for a matching device entry.
> Then it does create/remove device nodes according to the given information.
> This includes moving location (e.g. into a subdirectory), creating
> symlinks, setting owner, group and permissions. Everything mdev does is
> controlled by the rules in mdev.conf, but it may contain catch all rules to
> do some default action.
>
> A short search on the net gave me the following line:
>
> $DEVNAME=bus/usb/([0-9]+)/([0-9]+) root:plugdev 0660 =bus/usb/%1/%2
>
> Put this in your mdev.conf, may be it catches the names of your kernel.
>
> ..
>
> Harald
>
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Thanks for the help Harald!  I did not realize mdev was this
sophisticated.  It should work nicely for my needs.
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