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Commit 0fd80a77 authored by KT Liao's avatar KT Liao Committed by Dmitry Torokhov
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Input: update input_mt_report_pointer_emulation to support hovering 



For devices that are incapable of reporting per-contact distance and can
only report ABS_DISTANCE, just distance is not enough for upper layers of
OS to determine whether contact is leaving the area or if it is continuing
hovering, we need BTN_TOOL_FINGER for that:

                                   Contact State
                    Inactive          Hovering            Active
                   (far away)    (inside hover area)  (touching surface)
BTN_TOUCH              0                 0                   1
BTN_TOOL_FINGER        0                 1                   1
ABS_DISTANCE          N/A                1                   0

Signed-off-by: default avatarKT Liao <kt.liao@emc.com.tw>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent cd467299

drivers/input/input-mt.c

+16 −1
Original line number Original line Diff line number Diff line
@@ -218,8 +218,23 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count) 
	}

	}





	input_event(dev, EV_KEY, BTN_TOUCH, count > 0);

	input_event(dev, EV_KEY, BTN_TOUCH, count > 0);

	if (use_count)



	if (use_count) {

		if (count == 0 &&

		    !test_bit(ABS_MT_DISTANCE, dev->absbit) &&

		    test_bit(ABS_DISTANCE, dev->absbit) &&

		    input_abs_get_val(dev, ABS_DISTANCE) != 0) {

			/*

			 * Force reporting BTN_TOOL_FINGER for devices that

			 * only report general hover (and not per-contact

			 * distance) when contact is in proximity but not

			 * on the surface.

			 */

			count = 1;

		}



		input_mt_report_finger_count(dev, count);

		input_mt_report_finger_count(dev, count);

	}





	if (oldest) {

	if (oldest) {

		int x = input_mt_get_value(oldest, ABS_MT_POSITION_X);

		int x = input_mt_get_value(oldest, ABS_MT_POSITION_X);