Bug 18062

Summary:	Multitouch support for Synaptics V7.4 Touchpads
Product:	Drivers	Reporter:	tob (tobynbertram)
Component:	Input Devices	Assignee:	drivers_input-devices
Status:	RESOLVED OBSOLETE
Severity:	normal	CC:	alan, alex.hunziker, devel, hokasch, simar.i3r
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	Synaptics Multitouch Initialization Script to send Init sequence to touchpad and monitor response

Description tob 2010-09-08 07:31:24 UTC

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.

Comment 1 tob 2010-09-08 07:34:11 UTC

Created attachment 29282 [details]
Script to send Init sequence to touchpad and monitor response

Comment 2 Cody P Schafer 2010-09-09 21:04:14 UTC

Could you disclose what exactly the method of obtaining the initialization sequence was?

Comment 3 tob 2010-09-10 06:37:17 UTC

I followed the procedure that Andrew Skalski detailed in post #140 of this bug report: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/550625

Comment 4 Gursimran singh Mohar 2010-11-09 19:04:58 UTC

great work Tob!!