Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 10/23] Input: zforce_ts - fix dual touch recognition | Date | Mon, 9 May 2016 09:17:30 +0200 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Knut Wohlrab <Knut.Wohlrab@de.bosch.com>
commit 6984ab1ab35f422292b7781c65284038bcc0f6a6 upstream.
A wrong decoding of the touch coordinate message causes a wrong touch ID. Touch ID for dual touch must be 0 or 1.
According to the actual Neonode nine byte touch coordinate coding, the state is transported in the lower nibble and the touch ID in the higher nibble of payload byte five.
Signed-off-by: Knut Wohlrab <Knut.Wohlrab@de.bosch.com> Signed-off-by: Oleksij Rempel <linux@rempel-privat.de> Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/input/touchscreen/zforce_ts.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/input/touchscreen/zforce_ts.c +++ b/drivers/input/touchscreen/zforce_ts.c @@ -350,8 +350,8 @@ static int zforce_touch_event(struct zfo point.coord_x = point.coord_y = 0; } - point.state = payload[9 * i + 5] & 0x03; - point.id = (payload[9 * i + 5] & 0xfc) >> 2; + point.state = payload[9 * i + 5] & 0x0f; + point.id = (payload[9 * i + 5] & 0xf0) >> 4; /* determine touch major, minor and orientation */ point.area_major = max(payload[9 * i + 6],
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