linux-kernel - [PATCH v2 2/8] drivers:input:tsc2007: send pendown and penup only once like ads7846(+tsc2046) driver does

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Date:	Fri, 13 Nov 2015 21:35:53 +0100
From:	"H. Nikolaus Schaller" <hns@...delico.com>
To:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"H. Nikolaus Schaller" <hns@...delico.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Sebastian Reichel <sre@...nel.org>,
	Haibo Chen <haibo.chen@...escale.com>,
	Andrey Gelman <andrey.gelman@...pulab.co.il>,
	Igor Grinberg <grinberg@...pulab.co.il>,
	Aaron Sierra <asierra@...-inc.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, gta04-owner@...delico.com,
	linux-input@...r.kernel.org
Subject: [PATCH v2 2/8] drivers:input:tsc2007: send pendown and penup only once like ads7846(+tsc2046) driver does

this should reduce unnecessary input events.

Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
 drivers/input/touchscreen/tsc2007.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index e0c7173..1a8a79d 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -94,6 +94,7 @@ struct tsc2007 {
 
 	wait_queue_head_t	wait;
 	bool			stopped;
+	bool			pendown;
 
 	int			(*get_pendown_state)(struct device *);
 	void			(*clear_penirq)(void);
@@ -251,7 +252,10 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
 			dev_dbg(&ts->client->dev,
 					"shaped point(%4d,%4d), pressure (%4u)\n",
 					tc.x, tc.y, rt);
-			input_report_key(input, BTN_TOUCH, 1);
+			if (!ts->pendown) {
+				input_report_key(input, BTN_TOUCH, 1);
+				ts->pendown = true;
+			}
 			input_report_abs(input, ABS_X, tc.x);
 			input_report_abs(input, ABS_Y, tc.y);
 			input_report_abs(input, ABS_PRESSURE, rt);
@@ -272,9 +276,13 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
 
 	dev_dbg(&ts->client->dev, "UP\n");
 
-	input_report_key(input, BTN_TOUCH, 0);
-	input_report_abs(input, ABS_PRESSURE, 0);
-	input_sync(input);
+	if (ts->pendown) {
+		input_report_key(input, BTN_TOUCH, 0);
+		input_report_abs(input, ABS_PRESSURE, 0);
+		input_sync(input);
+
+		ts->pendown = false;
+	}
 
 	if (ts->clear_penirq)
 		ts->clear_penirq();
-- 
2.5.1

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