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Input: MT - add support for balanced slot assignment

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Some devices are not fast enough to differentiate between a fast-moving
contact and a new contact. This problem cannot be fully resolved because
information is truly missing, but it is possible to safe-guard against
obvious mistakes by restricting movement with a maximum displacement.

The new problem formulation for dmax > 0 cannot benefit from the speedup
for positive definite matrices, but since the convergence is faster, the
result is about the same. For a handful of contacts, the latency difference
is truly negligible.

Suggested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Henrik Rydberg <rydberg@bitmath.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Henrik Rydberg
2015-02-01 11:25:14 -08:00
committed by Dmitry Torokhov
parent 60bcaae15e
commit 448c7f3830
7 changed files with 27 additions and 17 deletions
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3
include/linux/input/mt.h
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@@ -119,7 +119,8 @@ struct input_mt_pos {
};
int input_mt_assign_slots(struct input_dev *dev, int *slots,
const struct input_mt_pos *pos, int num_pos);
const struct input_mt_pos *pos, int num_pos,
int dmax);
int input_mt_get_slot_by_key(struct input_dev *dev, int key);