Freeradius + AP + Access Point Client

How can I authenticate my access point CLIENT to AP in freeradius ?? In my network I have EAP/TLS authenticate and everything go well when I authenticate users with windows xp and WLAN cart, but one of my user have a access point client and this is a problem becouse I dont now how can I configure my freeradius. I need tell my access point that this access point client is authenticate to let in. The best soluton will be check ip and mac of access point client. how can I do that?? thank a lot many@poczta.fm