linux-kernel - [PATCH v3 2/8] drivers:input:tsc2007: send pendown and penup only once like ads7846(+tsc2046) driver does

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Message-Id: <9eab7072cf800efa30de74ba308ef5a1f943b045.1474634475.git.hns@goldelico.com>
Date:   Fri, 23 Sep 2016 14:41:10 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Michael Welling <mwelling@...e.org>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Igor Grinberg <grinberg@...pulab.co.il>,
        Sebastian Reichel <sre@...nel.org>,
        "Andrew F. Davis" <afd@...com>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        letux-kernel@...nphoenux.org, linux-iio@...r.kernel.org,
        "H. Nikolaus Schaller" <hns@...delico.com>
Subject: [PATCH v3 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 | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index 9a11509..e9d5086 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);
@@ -254,9 +255,13 @@ 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();
-- 
2.7.3