CONFIG_AD_SIGMA_DELTA (not configurable)

modulename: ad_sigma_delta.ko

configname: CONFIG_AD_SIGMA_DELTA

Linux Kernel Configuration
└─>Device Drivers
└─>Industrial I/O support
└─>Analog to digital converters
└─>AD_SIGMA_DELTA
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/iio/adc/ad_sigma_delta.c

depends
CONFIG_IIO