Commit 63c4fda3 authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Dmitry Torokhov

Input: synaptics - allocate 3 slots to keep stability in image sensors

When slowly dropping 1, 2 and then 3 fingers on an image sensor touchpad,
we can see that the first finger gets reassigned a new slot while it did
not move. This is due to the kernel tracking algorithm which can not assign
correctly the 3 touches, being out of slots.

Declaring that we support 3 slots allows to actually forward:
slot 0 -> down, slot 1 -> up, slot 2 -> down
Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: Henrik Rydberg <rydberg@bitmath.org
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 58fd9af6
...@@ -1189,7 +1189,7 @@ static void set_input_params(struct psmouse *psmouse, ...@@ -1189,7 +1189,7 @@ static void set_input_params(struct psmouse *psmouse,
ABS_MT_POSITION_Y); ABS_MT_POSITION_Y);
/* Image sensors can report per-contact pressure */ /* Image sensors can report per-contact pressure */
input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0); input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
input_mt_init_slots(dev, 2, INPUT_MT_POINTER | INPUT_MT_TRACK); input_mt_init_slots(dev, 3, INPUT_MT_POINTER | INPUT_MT_TRACK);
/* Image sensors can signal 4 and 5 finger clicks */ /* Image sensors can signal 4 and 5 finger clicks */
__set_bit(BTN_TOOL_QUADTAP, dev->keybit); __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
......
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