Created attachment 29262 [details]
Synaptics Multitouch Initialization

I was inspired by Andrew Skalski's work that he did for the Alps touchpad in Bug # 14660.  So I used the same technique to find the multitouch initialization sequence for the Synaptics Clickpad touchpad in my HP dv7t Select laptop.  I have attached the initialization sequence exchanged between the Windows 7 Synaptics driver and the touchpad as well as a script that I borrowed from Andrew Skalski's work that makes it easy to send the initialization sequence to the touchpad and monitor the response.

I haven't  figured out the new 12 byte protocol yet but here are a few quick observations:
1)One finger contact utilizes the same 6 byte absolute format that is detailed in the Synaptics PS/2 interfacing guide.  A new 12 byte protocol is used whenever 2 or more fingers are used.
2)The touchpad can report the contact of 1, 2, or 3 fingers.
3)X and Y coordinates for 2 points on the touchpad are provided.