This is how you can get the O2Micro smart card reader that is used on Dell D820 and my Old Acer Travelmate 6003. This reader is for sure used at allot of other machines, but those are listed here I've tested myself.

You can get the tar package here. This one was originally only for kernel 2.6.16 but some of the source is replaced by new files found here. For this tar package you don't have to do anything. I use it since kernel 2.6.19 and I now use it on kernel 2.6.22.4.

This package has one dependencie: pcsclite-1.2.9 or higher

All you have to is download and untar the package.
- run configure-release or configure-debug
- modprobe ozsrclx

There is a new package on this site, but was not able to get it working yet.