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| author | Hans de Goede <hdegoede@redhat.com> | 2015-05-20 14:37:41 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-05-20 14:46:02 -0700 |
| commit | 72eceab743cf61082357068e0686ffac66fe47e5 (patch) | |
| tree | 527ab486a388d32fcadd29be73f70856f7f7e6e8 /drivers/input/mouse/alps.c | |
| parent | 3c0213d17a09601e0c6c0ae0e27caf70d988290f (diff) | |
Input: alps - fix finger jumps on lifting 2 fingers on v7 touchpad
On v7 touchpads sometimes when 2 fingers are moved down on the touchpad
until they "fall of" the touchpad, the second touch will report 0 for y
(max y really since the y axis is inverted) and max x as coordinates,
rather then reporting 0, 0 as is expected for a non touching finger.
This commit detects this and treats these touches as non touching.
See the evemu-recording here:
https://bugzilla.redhat.com/attachment.cgi?id=1025058
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1221200
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/mouse/alps.c')
| -rw-r--r-- | drivers/input/mouse/alps.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c index e6708f6efb4d..7752bd59d4b7 100644 --- a/drivers/input/mouse/alps.c +++ b/drivers/input/mouse/alps.c @@ -941,6 +941,11 @@ static void alps_get_finger_coordinate_v7(struct input_mt_pos *mt, case V7_PACKET_ID_TWO: mt[1].x &= ~0x000F; mt[1].y |= 0x000F; + /* Detect false-postive touches where x & y report max value */ + if (mt[1].y == 0x7ff && mt[1].x == 0xff0) { + mt[1].x = 0; + /* y gets set to 0 at the end of this function */ + } break; case V7_PACKET_ID_MULTI: |