Thread (14 messages) 14 messages, 2 authors, 2011-05-17

Re: [PATCH 2/5] tsc2007: Add max_rt module parameter.

flat view

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: 2011-05-16 16:53:07

Hi Thierry,

On Mon, May 16, 2011 at 10:33:00AM +0200, Thierry Reding wrote:
Finger touch events or very quick stylus events on low-quality panels
can cause the tsc2007 to read bogus values. Looking at oscilloscope
snapshots, this seems to be caused by the touch event disappearing
during the measurements. These bogus values result in misclicks, where
the X and Y values deviate from the real position.

Most of these misclicks can be filtered out by setting a low enough
threshold for the maximum resistance (which is loosely the inverse of
the pressure) allowed to consider a set of values valid. Since this
behaviour is largely dependent on the type and quality of the panel,
this commit introduces the max_rt parameter. The default value is kept
at MAX_12BIT.
I expect that the values, once selected, will not be changed for a given
panel, so why don't we pass max_rt (and poll_delay and poll_interval) vi
platform (board) data instead of being module parameters?

Thanks.

-- 
Dmitry
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help