CONFIG_RT2X00_LIB_USB (not configurable)

modulename: rt2x00usb.ko

configname: CONFIG_RT2X00_LIB_USB

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Ralink driver support
└─>RT2X00_LIB_USB
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
source code:
drivers/net/wireless/rt2x00/rt2x00usb.c