linux - udev rule with few parent device attributes -

i need complex , universal udev rule determine usb-device plugged in port of usb hub. so, have combine parent attributes of different layers of device tree...

i have this:

$udevadm info --query=all --name=/dev/ttyusb0 --attribute-walk    looking @ device '/devices/platform/bcm2708_usb/usb1/1-1/1-1.2/1-1.2.4/1-1.2.4:1.0/ttyusb0/tty/ttyusb0':     kernel=="ttyusb0"     subsystem=="tty"     driver==""              . . .    looking @ parent device '/devices/platform/bcm2708_usb/usb1/1-1/1-1.2/1-1.2.4':     kernels=="1-1.2.4"     subsystems=="usb"     drivers=="usb"             ...    looking @ parent device '/devices/platform/bcm2708_usb/usb1/1-1/1-1.2':     kernels=="1-1.2"     subsystems=="usb"     drivers=="usb"     attrs{devpath}=="1.2"     attrs{idvendor}=="0835"             ...     attrs{idproduct}=="8500"     attrs{bdeviceclass}=="09"     attrs{product}=="usb2.0 hub"              . . . 

then constructed udev rule identify port of usb hub:

kernel=="ttyusb[0-9]*", kernels=="1-1.2.4", attrs{idvendor}=="0835", attrs{idproduct}=="8500", symlink+="port1" 

but it's not working when try use attributes different parent layers.

i know udev supports additional attributes 1 particular parent device. need rule combines attributes 2 parent nodes of device

could suggest solution? there trick it?

after many of unsuccessful experiences, found solution!

the key feature of setting environment variable:

1. on plugging event, looking vendor:id pair , remember in environment variable.
2. on same event, compare saved variable , usb-device tree nodes ids assign exact names of ports of usb-hub.

this document helped me http://www.reactivated.net/writing_udev_rules.html

kernel=="ttyusb[0-9]*", subsystem=="tty", subsystems=="usb", attrs{idvendor}=="05e3", attrs{idproduct}=="0610", env{usb_hub_type}="05e3:0610" kernel=="ttyusb[0-9]*", subsystem=="tty", subsystems=="usb", attrs{idvendor}=="0835", attrs{idproduct}=="8500", env{usb_hub_type}="0835:8500" # env{usb_hub_type}=="0835:8500", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].4:1.0", symlink+="port1" env{usb_hub_type}=="0835:8500", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].3:1.0", symlink+="port2" env{usb_hub_type}=="0835:8500", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].2:1.0", symlink+="port3" env{usb_hub_type}=="0835:8500", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].5.5:1.0", symlink+="port4" env{usb_hub_type}=="0835:8500", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].5.2:1.0", symlink+="port5" env{usb_hub_type}=="0835:8500", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].5.3:1.0", symlink+="port6" env{usb_hub_type}=="0835:8500", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].5.4:1.0", symlink+="port7" # env{usb_hub_type}=="05e3:0610", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].1.1:1.0" symlink+="port1" env{usb_hub_type}=="05e3:0610", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].2:1.0", symlink+="port2" env{usb_hub_type}=="05e3:0610", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].1.2:1.0", symlink+="port3" env{usb_hub_type}=="05e3:0610", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].3:1.0", symlink+="port4" env{usb_hub_type}=="05e3:0610", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].1.3:1.0", symlink+="port5" env{usb_hub_type}=="05e3:0610", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].4:1.0", symlink+="port6" env{usb_hub_type}=="05e3:0610", kernel=="ttyusb[0-9]*", subsystem=="tty", kernels=="1-1.[2-3].1.4:1.0", symlink+="port7" 

perhaps, useful someone.