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[2/5] input/alps: Handle 0-pressure 1F events

Message ID 20161003121630.5285-2-ben@smart-cactus.org (mailing list archive)
State Accepted
Headers show

Commit Message

Ben Gamari Oct. 3, 2016, 12:16 p.m. UTC 
While a button is held SS5 hardware will give us single-finger packets
with x, y, and pressure equal to zero. This causes annoying jumps in
pointer position if a touch is released while the button is held. Handle
this by claiming zero contacts to ensure that no position events are
provided to the user.

Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Tested-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Ben Gamari <ben@smart-cactus.org>
---
 drivers/input/mouse/alps.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index b8454af..7874f4f 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -1197,7 +1197,12 @@  static int alps_decode_ss4_v2(struct alps_fields *f,
 		f->mt[0].x = SS4_1F_X_V2(p);
 		f->mt[0].y = SS4_1F_Y_V2(p);
 		f->pressure = ((SS4_1F_Z_V2(p)) * 2) & 0x7f;
-		f->fingers = 1;
+		/*
+		 * When a button is held the device will give us events with x, y, and
+		 * pressure of 0. This causes annoying jumps if a touch is released while
+		 * the button is held. Handle this by claiming zero contacts.
+		 */
+		f->fingers = f->pressure > 0 ? 1 : 0;
 		f->first_mp = 0;
 		f->is_mp = 0;
 		break;