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Input: appletouch - improve finger detection

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The appletouch driver is prone to reporting multiple fingers when only
one is pressing.  The appletouch driver queries an array of pressure
sensors and counts local maxima in pressure to determine the number of
fingers.  It just does this on the raw values, so a data stream like:

0 100 250 300 299 300 250 100 0

actually registers as 2 fingers.

This patch updates the logic to ignore small dips in pressure that are
less than the threshold.

Signed-off-by: Jeremy Huddleston <jeremyhu@freedesktop.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Jeremy Huddleston 2009-06-03 07:29:39 -07:00 committed by Dmitry Torokhov
parent a862952830
commit 05e882f890
1 changed files with 1 additions and 1 deletions
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2
drivers/input/mouse/appletouch.c
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@ -361,7 +361,7 @@ static int atp_calculate_abs(int *xy_sensors, int nb_sensors, int fact,
(!is_increasing && xy_sensors[i - 1] < xy_sensors[i])) {
(*fingers)++;
is_increasing = 1;
} else if (i > 0 && xy_sensors[i - 1] >= xy_sensors[i]) {
} else if (i > 0 && (xy_sensors[i - 1] - xy_sensors[i] > threshold)) {
is_increasing = 0;
}