From 63c4fda3c0bb841b1aad1298fc7fe94058fc79f8 Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Sun, 5 Apr 2015 13:45:04 -0700 Subject: [PATCH] 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: Benjamin Tissoires Acked-by: Hans de Goede Acked-by: Henrik Rydberg --- drivers/input/mouse/synaptics.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index 3c54b9b0f65f..95898333834f 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -1189,7 +1189,7 @@ static void set_input_params(struct psmouse *psmouse, ABS_MT_POSITION_Y); /* Image sensors can report per-contact pressure */ 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 */ __set_bit(BTN_TOOL_QUADTAP, dev->keybit); -- 2.20.1