ADC Jack extcon support

modulename: extcon-adc-jack.ko

configname: CONFIG_EXTCON_ADC_JACK

Linux Kernel Configuration
└─>Device Drivers
└─>External Connector Class (extcon) support
└─>ADC Jack extcon support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y here to enable extcon device driver based on ADC values.

source code:
drivers/extcon/extcon-adc-jack.c