On 09/16/2012 03:33 PM, Linus Walleij wrote:

On Sun, Sep 16, 2012 at 11:56 AM, Alexandra Chin
[off-list ref] wrote:

quoted

Synaptics DS4 touchscreen driver implements a generic driver supporting I2C
protocol for Synaptics Design Studio 4 (DS4) family of Touchscreen Controllers
which include the following:

- S32xX series
- S730X series
- S22xx series

The driver supports multifinger pointing functionality and power management.
The driver is based on the original work submitted by
Linus Walleij [off-list ref] and
Naveen Kumar Gaddipati [off-list ref].

Naveen's driver is sitting in drivers/staging/ste_rmi4 right now because
Christopher Heiny is working on a RMI4 bus driver, and wanted to
merge that.

I am happy with this being merged for now if the plan is
to eventually replace it with Christopher's (et al) driver,
if it's not going to disturb the other driver in the end.

How are Synaptics planning to handle the transition?
(I assume you are coordinated... not always the case in
big companies, I know from experience :-)

Remember to keep Henrik Rydberg in the loop on touch
controllers.

Hi Linus,

The RMI4 bus driver will continue to be developed by my team, with the 
intent that it will support all RMI4 functions as well as all Synaptics 
RMI4 products, and the goal of eventual inclusion in the kernel. 
However, as you've noted elsewhere, this is taking a while. :-)

In the meantime, there is a perceived customer pull for a limited 
functionality product/platform specific "thin driver".  Alexandra's team 
has been working on such a driver, resulting in her patch submission 
from a couple of days ago.  They really would like to see both our 
drivers being adopted into the kernel. This will enable them to support 
all our customers effectively and provide our customers with the best 
flexibility possible. Going forward, Synaptics will continue to 
maintain, support and upgrade these drivers for future touch controller 
platforms as well.

						Chris