From 1d02ad436235080b8a95a2c86a66cb7b8f2e9df9 Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Fri, 15 Oct 2010 09:49:08 -0700 Subject: [PATCH] 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 Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/ad7877.c | 7 +++++++ 1 file changed, 7 insertions(+) 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 @@ 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); -- 2.7.4