From: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Henrik Rydberg <rydberg@bitmath.org>,
Andi Shyti <andi@etezian.org>,
Stephan Gerhold <stephan@gerhold.net>,
linux-input@vger.kernel.org,
Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>,
Javi Ferrer <javi.f.o@gmail.com>
Subject: [PATCH] Input: mms114: don't report 0 pressure while still tracking contact(s)
Date: Sat, 6 Jun 2020 05:50:17 +0200 [thread overview]
Message-ID: <20200606035017.7271-1-GNUtoo@cyberdimension.org> (raw)
In the middle of a sliding gesture, we manage to have events
that look like that:
Event: time 1571859641.595517, -------------- SYN_REPORT ------------
Event: time 1571859641.606593, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1193
Event: time 1571859641.606593, type 3 (EV_ABS), code 48 (ABS_MT_TOUCH_MAJOR), value 21
Event: time 1571859641.606593, type 3 (EV_ABS), code 58 (ABS_MT_PRESSURE), value 0
Event: time 1571859641.606593, type 3 (EV_ABS), code 1 (ABS_Y), value 1193
Event: time 1571859641.606593, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 0
Event: time 1571859641.606593, -------------- SYN_REPORT ------------
In such cases, we still have a valid ABS_MT_TRACKING_ID along
with an ABS_MT_TOUCH_MAJOR that is > 0, which both indicates
that the sliding is still in progress.
However in Documentation/input/multi-touch-protocol.rst, we
have:
ABS_MT_PRESSURE
The pressure, in arbitrary units, on the contact
area. May be used instead of TOUCH and WIDTH for
pressure-based devices or any device with a spatial
signal intensity distribution.
Because of that userspace may consider an ABS_MT_PRESSURE
of 0 as an indication that the sliding stopped. This has
side effects such as making it difficult to unlock the
screen under Android.
This fix was tested on the following devices:
- GT-I9300 with a glass screen protection
- GT-I9300 without any screen protection
- GT-N7105 with a glass screen protection
Reported-by: Javi Ferrer <javi.f.o@gmail.com>
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
---
drivers/input/touchscreen/mms114.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/input/touchscreen/mms114.c b/drivers/input/touchscreen/mms114.c
index 2ef1adaed9af..adc18cd9a437 100644
--- a/drivers/input/touchscreen/mms114.c
+++ b/drivers/input/touchscreen/mms114.c
@@ -183,7 +183,10 @@ static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *tou
if (touch->pressed) {
touchscreen_report_pos(input_dev, &data->props, x, y, true);
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, touch->width);
- input_report_abs(input_dev, ABS_MT_PRESSURE, touch->strength);
+ if (touch->strength) {
+ input_report_abs(input_dev, ABS_MT_PRESSURE,
+ touch->strength);
+ }
}
}
--
2.26.2
next reply other threads:[~2020-06-06 4:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-06 3:50 Denis 'GNUtoo' Carikli [this message]
2020-06-06 18:18 ` [PATCH] Input: mms114: don't report 0 pressure while still tracking contact(s) Dmitry Torokhov
2020-06-08 1:06 ` Peter Hutterer
2020-06-12 17:46 ` Denis 'GNUtoo' Carikli
2020-06-14 23:57 ` Peter Hutterer
2020-06-23 16:25 ` Denis 'GNUtoo' Carikli
2020-06-26 0:04 ` Peter Hutterer
2020-07-26 21:42 ` Denis 'GNUtoo' Carikli
2020-09-07 3:06 ` Peter Hutterer
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