DEVNAME not set when executing udev rule

DEVNAME not set when executing udev rule

[Stefan Conrad]

Hi,

I am trying to initialise a MidiSport USB interface with a udev rule
that triggers fxload to upload the firmware:

ACTION="add", SUBSYSTEM="usb", DEVPATH="/*.0",
ENV{PRODUCT}="763/1001/*", RUN+="/sbin/fxload -v -s
/usr/local/share/usb/maudio/MidiSportLoader.ihx -I
/usr/local/share/usb/maudio/MidiSport2x2.ihx -D $env{DEVNAME}"

The problem:
DEVNAME is not set in the environment.
Only DEVICE is set with the 'wrong' device file name under /proc/bus/usb
 which is deprecated and thus not useful.

System: Suse 11.1 Linux 2.6.27.29-0.1-default #1 SMP 2009-08-15 17:53:59
+0200 i686 athlon i386 GNU/Linux
udev Version: 128

What can I do to pass a valid device file name to fxload to upload the
firmware?

Thanks,

Stefan

Re: DEVNAME not set when executing udev rule

[Kay Sievers]

On Fri, Sep 4, 2009 at 00:33, Stefan Conrad<dr.stefan.conrad@t-online.de> wrote:
> I am trying to initialise a MidiSport USB interface with a udev rule
> that triggers fxload to upload the firmware:
>
> ACTION="add", SUBSYSTEM="usb", DEVPATH="/*.0",

Better use KERNEL="*.0". Matching on the DEVPATH is in most cases wrong.

> ENV{PRODUCT}="763/1001/*", RUN+="/sbin/fxload -v -s
> /usr/local/share/usb/maudio/MidiSportLoader.ihx -I
> /usr/local/share/usb/maudio/MidiSport2x2.ihx -D $env{DEVNAME}"
>
> The problem:
> DEVNAME is not set in the environment.

The rule matches on USB devices _and_ interfaces and runs several
times. You better limit it to the device only with:
ENV{DEVTYPE}="usb_device".

> Only DEVICE is set with the 'wrong' device file name under /proc/bus/usb
>  which is deprecated and thus not useful.

There is a known timing problem with the usb device nodes, and this
should fix it:
http://git.kernel.org/?p=linux/kernel/git/gregkh/patches.git;a=blob;f=driver-core/driver-core-add-new-device-to-bus-s-list-before-probing.patch;hb=HEAD

Kay