Messages in this thread Patch in this message | | | From | Jiri Slaby <> | Subject | [PATCH 3.12 078/111] Input: elantech - fix semi-mt protocol for v3 HW | Date | Wed, 10 Jun 2015 17:27:07 +0200 |
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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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commit 3c0213d17a09601e0c6c0ae0e27caf70d988290f upstream.
When the v3 hardware sees more than one finger, it uses the semi-mt protocol to report the touches. However, it currently works when num_fingers is 0, 1 or 2, but when it is 3 and above, it sends only 1 finger as if num_fingers was 1.
This confuses userspace which knows how to deal with extra fingers when all the slots are used, but not when some are missing.
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=90101
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- drivers/input/mouse/elantech.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c index 04a7d9f00928..71540c0eee44 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -314,7 +314,7 @@ static void elantech_report_semi_mt_data(struct input_dev *dev, unsigned int x2, unsigned int y2) { elantech_set_slot(dev, 0, num_fingers != 0, x1, y1); - elantech_set_slot(dev, 1, num_fingers == 2, x2, y2); + elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2); } /* -- 2.4.2
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