linux-kernel - [PATCHv4 4/5] Input: edt-ft5x06: Ignore touchdown events

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Message-Id: <1395234563-11034-5-git-send-email-LW@KARO-electronics.de>
Date:	Wed, 19 Mar 2014 14:09:22 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Fugang Duan <B38611@...escale.com>,
	Grant Likely <grant.likely@...aro.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Jingoo Han <jg1.han@...sung.com>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Rob Landley <rob@...dley.net>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Simon Budig <simon.budig@...nelconcepts.de>,
	Lothar Waßmann <LW@...O-electronics.de>
Subject: [PATCHv4 4/5] Input: edt-ft5x06: Ignore touchdown events

The chip may report invalid coordinates on touchdown events, so don't
report the initial touchdown event.

Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
---
 drivers/input/touchscreen/edt-ft5x06.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index 27dccfc..af736e4 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -175,6 +175,10 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
 		if (type == TOUCH_EVENT_RESERVED)
 			continue;
 
+		/* ignore TOUCH_DOWN events, might have bogus coordinates */
+		if (type == TOUCH_EVENT_DOWN)
+			continue;
+
 		x = ((buf[0] << 8) | buf[1]) & 0x0fff;
 		y = ((buf[2] << 8) | buf[3]) & 0x0fff;
 		id = (buf[2] >> 4) & 0x0f;
-- 
1.7.10.4

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