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 <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/touchscreen/ad7877.c

···
 		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);