Your touchpad is an Alps. You could try 1Revenger1's VoodooPS2Controller, see if that helps.
For me, I just use BAndysc's version on my E7470. It doesn't give me gestures but 2 fingers scroll works. Tracksticks works as a mouse, so I just use Smartscroll enable the middle button for scrolling as well.
If that doesn't work either, you could try ApplePS2Controller.kext from in my Clover E7470 guide, works the same as BAnydysc's kext except without the CapLock Fix.