ARM Linux Examples for GPIO, I2C etc.

hello,

I am new at ARM-Linux. I tried successfully "hello world" example at one
olimex board (SAM9-L9260) and now I want to learn more about ARM
programming under Linux. Do someone have example code for using of I2C
at arm linux? Also I am searching for simple GPIO linux examples e.g. to
let blink one LED on some custom defined IO Pin.

thanks for help