Map physical USB device path to the Bus/Device number returned by lsusb

Firstly, we need to prepend /sys to the path returned by udev, so that path becomes something like: /sys/devices/pci0000:00/0000:00:1d.0/usb5/5-2. Then go to this directory, and there will be several files in it. Among others, there are busnum and devnum files, they contain these "logical" numbers. So, in bash script, we can retrieve them like that:

devpath='/devices/pci0000:00/0000:00:1d.0/usb5/5-2'

busnum=$(cat "/sys/$devpath/busnum")
devnum=$(cat "/sys/$devpath/devnum")

# we might want to make busnum and devnum have leading zeros
# (say, "003" instead of "3", and "012" instead of "12")
busnum=$(printf %03d $busnum)
devnum=$(printf %03d $devnum)

# now, we can retrieve device data by   lsusb -D /dev/bus/usb/$busnum/$devnum

echo "busnum=$busnum, devnum=$devnum"

Also note that udev can return these busnum and devnum directly: in RUN+="..." we can use substitutions $attr{busnum} and $attr{devnum} respectively.