CONFIG_LIB80211 (not configurable)

modulename: lib80211.ko

configname: CONFIG_LIB80211

Linux Kernel Configuration
└─>Networking support
└─>Wireless
└─>LIB80211
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
This options enables a library of common routines used
by IEEE802.11 wireless LAN drivers.

Drivers should select this themselves if needed.

source code:
net/wireless/lib80211.c