From: Michael Hennerich <michael.hennerich@analog.com>
Date: Fri, 15 Oct 2010 16:49:08 +0000 (-0700)
Subject: Input: ad7877 - filter events where pressure is beyond the maximum
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1d02ad436235080b8a95a2c86a66cb7b8f2e9df9;p=linux-beck.git

Input: ad7877 - filter events where pressure is beyond the maximum

Suppress events where pressure > pressure_max.
These events come typically along with inaccurate X and Y samples.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c
index 96c0a0d4b69c..b7de78e82737 100644
--- a/drivers/input/touchscreen/ad7877.c
+++ b/drivers/input/touchscreen/ad7877.c
@@ -360,6 +360,13 @@ static int ad7877_rx(struct ad7877 *ts)
 		Rt /= z1;
 		Rt = (Rt + 2047) >> 12;
 
+		/*
+		 * Sample found inconsistent, pressure is beyond
+		 * the maximum. Don't report it to user space.
+		 */
+		if (Rt > ts->pressure_max)
+			return -EINVAL;
+
 		if (!timer_pending(&ts->timer))
 			input_report_key(input_dev, BTN_TOUCH, 1);