This is a note to let you know that I've just added the patch titled
Input: alps - v7: ignore new packets
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
input-alps-v7-ignore-new-packets.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 8b23811535d2e1dd6abbe4ce6ea1edfd50ce72de Mon Sep 17 00:00:00 2001
From: Hans de Goede <[email protected]>
Date: Thu, 18 Dec 2014 09:52:59 -0800
Subject: Input: alps - v7: ignore new packets
From: Hans de Goede <[email protected]>
commit 8b23811535d2e1dd6abbe4ce6ea1edfd50ce72de upstream.
NEW packets are send to indicate a discontinuity in the finger coordinate
reporting. Specifically a finger may have moved from slot 0 to 1 or vice
versa. INPUT_MT_TRACK takes care of this for us.
NEW packets have 3 problems:
1) They do not contain middle / right button info (on non clickpads)
this can be worked around by preserving the old button state
2) They do not contain an accurate fingercount, and they are
typically send when the number of fingers changes. We cannot use
the old finger count as that may mismatch with the amount of
touch coordinates we've available in the NEW packet
3) Their x data for the second touch is inaccurate leading to
a possible jump of the x coordinate by 16 units when the first
non NEW packet comes in
Since problems 2 & 3 cannot be worked around, just ignore them.
BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=86338
Signed-off-by: Hans de Goede <[email protected]>
Tested-by: Benjamin Tissoires <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/input/mouse/alps.c | 30 ++++++++++++++++++++++++------
1 file changed, 24 insertions(+), 6 deletions(-)
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -938,18 +938,36 @@ static int alps_decode_packet_v7(struct
return 0;
if (pkt_id == V7_PACKET_ID_UNKNOWN)
return -1;
+ /*
+ * NEW packets are send to indicate a discontinuity in the finger
+ * coordinate reporting. Specifically a finger may have moved from
+ * slot 0 to 1 or vice versa. INPUT_MT_TRACK takes care of this for
+ * us.
+ *
+ * NEW packets have 3 problems:
+ * 1) They do not contain middle / right button info (on non clickpads)
+ * this can be worked around by preserving the old button state
+ * 2) They do not contain an accurate fingercount, and they are
+ * typically send when the number of fingers changes. We cannot use
+ * the old finger count as that may mismatch with the amount of
+ * touch coordinates we've available in the NEW packet
+ * 3) Their x data for the second touch is inaccurate leading to
+ * a possible jump of the x coordinate by 16 units when the first
+ * non NEW packet comes in
+ * Since problems 2 & 3 cannot be worked around, just ignore them.
+ */
+ if (pkt_id == V7_PACKET_ID_NEW)
+ return 1;
alps_get_finger_coordinate_v7(f->mt, p, pkt_id);
- if (pkt_id == V7_PACKET_ID_TWO || pkt_id == V7_PACKET_ID_MULTI) {
- f->left = (p[0] & 0x80) >> 7;
- f->right = (p[0] & 0x20) >> 5;
- f->middle = (p[0] & 0x10) >> 4;
- }
+ f->left = (p[0] & 0x80) >> 7;
+ f->right = (p[0] & 0x20) >> 5;
+ f->middle = (p[0] & 0x10) >> 4;
if (pkt_id == V7_PACKET_ID_TWO)
f->fingers = alps_get_mt_count(f->mt);
- else if (pkt_id == V7_PACKET_ID_MULTI)
+ else /* pkt_id == V7_PACKET_ID_MULTI */
f->fingers = 3 + (p[5] & 0x03);
return 0;
Patches currently in stable-queue which might be from [email protected] are
queue-3.18/input-alps-v7-ignore-new-packets.patch
queue-3.18/input-alps-v7-sometimes-a-single-touch-is-reported-in-mt.patch
queue-3.18/input-alps-v7-fix-finger-counting-for-2-fingers-on-clickpads.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
