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authorKT Liao <kt.liao@emc.com.tw>2016-05-19 17:38:07 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2016-06-01 14:21:10 -0700
commit0fd80a77e4d2f34e9fe66a73edf81d4a30bd4ca4 (patch)
treec3b43a4910e78e27b1b9839d8cd2717fe756d806 /drivers
parentInput: raydium_i2c_ts - do not ignore EPROBE_DEFER from gpiod_get_optional (diff)
downloadlinux-dev-0fd80a77e4d2f34e9fe66a73edf81d4a30bd4ca4.tar.xz
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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: KT Liao <kt.liao@emc.com.tw> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/input-mt.c17
1 files changed, 16 insertions, 1 deletions
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);