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I would like to access the raw data from my touchpad before the data is processed into a single X,Y coordinate. Instead, I would like a grid of values as portrayed here:

enter image description here

(image from howstuffworks.com/iphone3.htm)

I don't think this is possible with my touchpad (info below). However, if anyone has had any luck accomplishing this with a different touchpad model, or even touchscreen on any other device, I would like to know the model and how. And if anyone disagrees and knows how to do this on my model, even better!

My laptop uses a Synaptics PS/2 touchpad with hardware ID ACPI\SYN070B.

Looking at a diagram on page 17 of the Synaptics API manual for a PS/2 touchpad, it seems the processing occurs within the touchpad, and only a single point is sent to the driver, so I don't think it is possible for my touchpad.

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This is likely done at hardware or firmware level, all the operating system receives is the "cleaned up" touch coordinate. –  Thomas Jan 27 '13 at 17:27
    
I think so for the PS/2 Synaptics, but there must be some models that send this information for multitouch gestures and such, no? –  aaronrmm Jan 27 '13 at 17:41
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