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From:   Markus Burri <markus.burri@mt.com>
To:     linux-kernel@vger.kernel.org
Cc:     Markus Burri <markus.burri@mt.com>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Henrik Rydberg <rydberg@bitmath.org>,
        linux-input@vger.kernel.org
Subject: [PATCH v0001 1/1] input/ts: ili210x: send abs-mt-pressure for untouched
Date:   Tue, 17 Oct 2023 15:10:57 +0200
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Send the ABS_MT_PRESSURE event in case of untouched with zero pressure.
Multitouch pressure is only sent on first touch.

Therefore send an ABS_MT_PRESSURE event in case of untouched with zero pressure.
This avoids that the next ABS_MT_PRESSURE event will
be filtered out by input_defuzz_abs_event() in input.c since the pressure
value has not changed.

Signed-off-by: Markus Burri <markus.burri@mt.com>
---
 drivers/input/touchscreen/ili210x.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
index e9bd36a..6b79513 100644
--- a/drivers/input/touchscreen/ili210x.c
+++ b/drivers/input/touchscreen/ili210x.c
@@ -318,7 +318,8 @@ static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
 			if (priv->chip->has_pressure_reg)
 				input_report_abs(input, ABS_MT_PRESSURE, z);
 			contact = true;
-		}
+		} else if (priv->chip->has_pressure_reg)
+			input_report_abs(input, ABS_MT_PRESSURE, 0);
 	}
 
 	input_mt_report_pointer_emulation(input, false);
-- 
2.39.2