How to figure out primary/secondary IDE channel via sysfs (if possible)

Though I've got quite a good basic understanding of sysfs meanwhile, there are still things I cannot solve on my own. For a starter, I'd like to figure out *via sysfs* (later by scripting of course) which channel a block device (HDD, DVD...) is connected to. The funny thing about it is that it is possible for me how to figure out __master or slave__! There is an internal ID deeply rooted in the sysfs tree which gives this away: so 9:0:1 will mean that the device is connected to a (primary OR secondary) __slave__ channel. (master when last digit 0; slave when last digit is 1) OK, but this will still not tell me whether it's the primary or secondary channel. While doing some research about this, I found a __Linux 2.6__-related post in LKML: https://lkml.org/lkml/2006/3/25/20 revealing a sample path like ../../../devices/pci0000:00/0000:00:04.0/ide0/0.0/. Well this is EXACTLY what I need! Unfortunately though, the ideX is nowhere to find in sysfs as of Linux 3.x. Maybe it was removed for good in kernel version 3?