[OpenWrt-Devel] How can I get the dBm when the phone connecting the router.

[Soulkey]

Hi,
I have some problem to solve, and hope I can get some help. Thank you !!!
MTK7620A Soc and the OPENWRT official wifi driver (cfg80211, mac80211, rt2800-soc).
May I ask how can I get the signal intensity when the device connecting the router, and let me according to the signal strength to determine whether to allow the access.
Is there any command or software can do this ? 
And , if I have to modify the wifi-driver, what shall I do ?

I need a idea , please help me , thank you very much!!!
INYO
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