From 0fd80a77e4d2f34e9fe66a73edf81d4a30bd4ca4 Mon Sep 17 00:00:00 2001 From: KT Liao Date: Thu, 19 May 2016 17:38:07 -0700 Subject: [PATCH] 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: KT Liao Signed-off-by: Dmitry Torokhov --- drivers/input/input-mt.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c index 54fce56c8023..a1bbec9cda8d 100644 --- a/drivers/input/input-mt.c +++ b/drivers/input/input-mt.c @@ -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); - 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); + } if (oldest) { int x = input_mt_get_value(oldest, ABS_MT_POSITION_X); -- 2.20.1