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

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Message-ID: <872e4d7ea1ed455592b0bf828d69fb26@BLUPR03MB373.namprd03.prod.outlook.com>
Date:	Thu, 20 Mar 2014 05:22:01 +0000
From:	"fugang.duan@...escale.com" <fugang.duan@...escale.com>
To:	Lothar Waßmann <LW@...O-electronics.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.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" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Simon Budig <simon.budig@...nelconcepts.de>
Subject: RE: [PATCHv4 4/5] Input: edt-ft5x06: Ignore touchdown events

From: Lothar Waßmann <LW@...O-electronics.de>
Data: Wednesday, March 19, 2014 9:09 PM

>To: Dmitry Torokhov; Duan Fugang-B38611; Grant Likely; Henrik Rydberg; Ian
>Campbell; Jingoo Han; Kumar Gala; Mark Rutland; Pawel Moll; Rob Herring; Rob
>Landley; Sachin Kamat; devicetree@...r.kernel.org; linux-doc@...r.kernel.org;
>linux-input@...r.kernel.org; linux-kernel@...r.kernel.org; Simon Budig; Lothar
>Waßmann
>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
>
>

Acked-by: Fugang Duan <B38611@...escale.com>