There is no C code released. The information that is released is part of An Algorithm To Help Calculate P & Q Values - Cypress Semiconductor KB article that can be found at link: http://www.cypress.com/?rID=27709.
I believe you are aware that using I2C you can only program the volatile memory, not the non-volatile memory. So you would have to program the device at every power-on with your new configuration using I2C. The part is not designed to program the non-volatile memory using I2C.
You can check the following Kb Articles that you will find useful:
Let me know if there are any further questions!