How might I get the touchpad numpad working on a VivoBook_ASUSLaptop E210MAB_L210M?

The small laptops we use at work have a numpad on the touchpad, so that tapping the touchpad in certain positions types numbers. At least, that's what it did on Windows. On Trisquel, the touchpad numpad does not do anything, though it still works as a normal touchpad.

If I wanted to get the touchpad numpad working, what would be a good way to do it? I can already see toucpad input with evtest, so I imagine one approach would be to have a program read from evtest (or from /dev/input devices directly) and type numbers based on that, but I'm guessing there's also a better approach that is less obvious. That approach also would not enable control of the light on the touchpad that indicates whether the numpad is enabled.

Is there a driver that handles the touchpad? How can I tell which one? It doesn't seem to be a PCI or USB device (i.e. I don't see it in lspci or lsusb).

Can anyone give me some hints for how best to map touch inputs to key presses and for how to learn how to control the light on the touchpad?