First release version.

We use three keys to simulate usb mouse:
KEY1: the left button of mouse;
KEY2: the right button of mouse;
KEY3: the middle button of mouse;

you can add your key handle routine to add the function
of jz2440 mouse, such as you can add the move function
of jz2440 mouse, just detect the long press of key, and
report it to HID driver, and you can also add your own
function if you like:)