Using built-in functions from the Drivers -> src folder

Has anyone used the built-in functions from the Drivers -> src folder in their project?

For example, I am trying to interface and SD Card. The project_bsp folder has a drivers folder. Under that we have an 'inc' and a 'src' folder. In the 'src' folder, there's file called altera_up_sd_card_avalon_interface.c which defines many functions for using the SD Card.

The question is, how can I use those functions in my main.c file? Can someone give me an example please?

Thanks!