GPIO-based I2C multiplexer

modulename: i2c-mux-gpio.ko

configname: CONFIG_I2C_MUX_GPIO

Linux Kernel Configuration
└─>Device Drivers
└─>I2C support
└─>Multiplexer I2C Chip support
└─>GPIO-based I2C multiplexer
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
If you say yes to this option, support will be included for a
GPIO based I2C multiplexer. This driver provides access to
I2C busses connected through a MUX, which is controlled
through GPIO pins.

This driver can also be built as a module. If so, the module
will be called i2c-mux-gpio.

source code: