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 96c0a0d..b7de78e 100644
--- a/drivers/input/touchscreen/ad7877.c
+++ b/drivers/input/touchscreen/ad7877.c
@@ -360,6 +360,13 @@
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);