ChromeOS EC tunnel I2C bus

modulename: i2c-cros-ec-tunnel.ko

configname: CONFIG_I2C_CROS_EC_TUNNEL

Linux Kernel Configuration
└─>Device Drivers
└─>I2C support
└─>I2C Hardware Bus support
└─>ChromeOS EC tunnel I2C bus
In linux kernel since version 3.10 (release Date: 2013-06-30)  
If you say yes here you get an I2C bus that will tunnel i2c commands
through to the other side of the ChromeOS EC to the i2c bus
connected there. This will work whatever the interface used to
talk to the EC (SPI, I2C or LPC).

source code: