On Tue, 8 Nov 2011, Uwe Bonnes wrote:
> Hello,
>
> in a quest to get static name for our devices, I started with following
> rule:
>
> SUBSYSTEMS=="usb", KERNEL=="ttyUSB*", ATTRS{manufacturer}=="IKDA", \
> SYMLINK="%s{product}_%s{serial}"
>
> This produces links like
> lrwxrwxrwx 1 root root 7 8. Nov 17:07 FTDIJTAG_0002 -> ttyUSB1
>
> However when the connected device has more interfaces, this doesn't work
> out for interfaces other then the last.
>
> I tried
> SUBSYSTEMS=="usb", KERNEL=="ttyUSB*", ATTRS{manufacturer}=="IKDA", \
> SYMLINK="%s{product}_%s{serial}_%s{bInterfaceNumver}"
>
> but that only produces a link like:
> lrwxrwxrwx 1 root root 7 8. Nov 17:09 FTDIJTAG_0002_
>
> Digging deeper with
> udevadm info -a -p `udevadm info -q path -n /dev/ttyUSB2`
>
> I find ATTRS{bInterfaceNumber}=="01" on the second level of parents
> while ATTRS{manufacturer}=="IKDA" is on the third level. The Udevadm info
> says:
> > A rule to match, can be composed by the attributes of the device
> > and the attributes from one single parent device.
>
> So this probably breaks the "one single parent device" rule.
>
> Is my wish flawed? Udev? Any way to get around?
This would be better off posted to a udev-oriented mailing list, such
as linux-hotplug.
I don't know much about udev. Can you get away with using
"%s{../product}_%s{../serial}_%s{bInterfaceNumber}"? That would
satisfy the single-parent-device rule.
Alan Stern
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