Yea all you need is a pull down resistor on on of the two CC lines.
For default usb power (5v 500/900ma) it is a 5.1k pulldown resistor.
I am not sure what the values for the following are, but they are also available power options, using resistors.
5V 1.5A
5V 3A
In testing I have found that most USB wall chargers dont need the resistors to provide power, howver most properly implemented ports do need one of these resistors to start providing power.
For any power levels over 5v or over 3A, you would need to get a Power Delivery chip than can communicate with the power provider to negotiate the higher power levels.