I2C under Linux

The first possibility to access I2C devices under Linux is using a kernel driver for your device.

In case you want to access the I2C bus from userspace, you have to use the i2c-dev driver.

You can do this using the i2c-tools package or by writing a custom program.

 

The i2c-tools documentation can be found here:

http://www.lm-sensors.org/wiki/i2cToolsDocumentation

 

If you want to use the interface with a custom program the relevant documentation is here:

https://www.kernel.org/doc/Documentation/i2c/dev-interface