[PATCH 3/3] Input: touchscreen: ad7877 filter events where pressure is beyond the maximum
From: <michael.hennerich@analog.com>
Date: 2010-10-15 10:47:34
Subsystem:
ad7877 touchscreen driver, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Michael Hennerich, Dmitry Torokhov, Linus Torvalds
From: Michael Hennerich <michael.hennerich@analog.com> 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> --- drivers/input/touchscreen/ad7877.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c
index 96c0a0d..e6917db 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);
--
1.6.0.2