CSR wireless driver

modulename: csr_wifi.ko

and/or

csr_helper.ko

configname: CONFIG_CSR_WIFI

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>MMC/SD/SDIO card support
└─>CSR wireless driver
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Driver for the CSR wireless SDIO device.

If unsure, select N.

source code:
drivers/staging/csr/