CONFIG_IWLEGACY (not configurable)

modulename: iwlegacy.ko

configname: CONFIG_IWLEGACY

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>IWLEGACY
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/net/wireless/intel/iwlegacy/