STMicroelectronics ST21NFCA NFC driver (I2C)

modulename: st21nfca_i2c.ko

configname: CONFIG_NFC_ST21NFCA_I2C

Linux Kernel Configuration
└─>Networking support
└─>NFC subsystem support
└─>Near Field Communication (NFC) devices
└─>STMicroelectronics ST21NFCA NFC driver (I2C)
In linux kernel since version 3.16 (release Date: 2014-08-03)  
This module adds support for the STMicroelectronics st21nfca i2c interface.
Select this if your platform is using the i2c bus.

If you choose to build a module, it'll be called st21nfca_i2c.
Say N if unsure.

source code: