From: Klaus Pedersen <klaus.k.pedersen@nokia.com>
Date: Fri, 15 Feb 2008 21:31:39 +0000 (+0200)
Subject: tsc2301 - add coordinate average filter
X-Git-Tag: v2.6.25-omap1~181
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f56fb3e6a168589c6663c1a42ba64204eea64a2;p=pandora-kernel.git

tsc2301 - add coordinate average filter

To get good touchscreen results filtering is essential.
The filter does 2 things - it removes "bad" measurements,
and it uses average to smooth the coordinates.

Use the HW-filter in the tsc2301 to remove high frequency
noise (from backlight). Using 8 sample average is very
efficient.
Another source of noise is the screen, but that generates
low freq noise and thus require a SW filter. Using 4
coordinate history average is efficient.

Signed-off-by: Klaus Pedersen <klaus.k.pedersen@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
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