[PATCH] input/touchscreen: add S3C24XX SoC touchscreen input driver

[broonie@opensource.wolfsonmicro.com (Mark Brown)]

On Tue, Oct 20, 2009 at 03:21:17AM -0500, Nelson Castillo wrote:

> Can the s3c driver send the events at full speed? (Maximum possible ADC rate?).

> Even if it's possible I think we would monopolize the adc driver
> needlessly because we don't need all that conversions when there is
> not much noise. Please read on.

There's currently no facility to push sample rate requests down into the
kernel from userspace.  However, this is a good idea in general - there
was some recent (brief) discussion of doing this on the linux-input list.
Since different use cases have different sample rate requirements (such
as the difference between handwriting recognition which can need 200
samples/second and a simple finger operated menu which may be happy with
10) there's value in being able to vary the sample rate at run time.  I
was intending to look at this shortly as part of some touchscreen driver
development I need to do soon or perhaps someone else will pick up the
idea, if it does get implemented then obviously tslib would also be able
to use it here.