| From | lizf@kernel ... | Subject | [PATCH 3.4 102/146] Input: elantech - fix semi-mt protocol for v3 HW | Date | Tue, 15 Sep 2015 17:03:37 +0800 |
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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
3.4.109-rc1 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: Zefan Li <lizefan@huawei.com> --- 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 877dbc8..c907f9d 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -313,7 +313,7 @@ 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); } /* -- 1.9.1
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