Hello Josua,
Josua Dietze [2010-12-21 21:25 +0100]:
> I found the man page (well, xml file) in the git tree and just added
> an ATTRS match to the top level USB device.
>
> This worked:
> KERNEL=="ttyUSB*", ATTRS{bNumConfigurations}=="*", RUN+="myprog %p
> %s{idVendor} %s{idProduct}"
Right, you need to "select" the parent device of which you need the
id* attribute.
> But I might add that there is certainly some documentation lacking
> on this one, practially everything I found was outdated or
> inaccurate ...
This is indeed a common trap, so some time ago I tried to point this
out more clearly in the manpage:
$attr{file}, %s{file}
The value of a sysfs attribute found at the device, where all keys
of the rule have matched. If the matching device does not have such
an attribute, and a previous KERNELS, SUBSYSTEMS, DRIVERS, or ATTRS
test selected a parent device, use the attribute from that parent
device.
This tries to point out that this won't match attributes from any
parent device. Do you think this paragraph is unclear? If so, do you
have a suggestion how to improve it? Or did you not see it in the
first place?
Thank you,
Martin
--
Martin Pitt | http://www.piware.de
Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org)
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