This is a note to let you know that I've just added the patch titled
HID: multitouch: require Finger field to mark Win8 reports as MT
to the 5.10-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:
hid-multitouch-require-finger-field-to-mark-win8-reports-as-mt.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a2353e3b26012ff43bcdf81d37a3eaddd7ecdbf3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ahelenia=20Ziemia=C5=84ska?=
<nabijaczleweli@xxxxxxxxxxxxxxxxxx>
Date: Mon, 8 Mar 2021 18:42:03 +0100
Subject: HID: multitouch: require Finger field to mark Win8 reports as MT
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From: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
commit a2353e3b26012ff43bcdf81d37a3eaddd7ecdbf3 upstream.
This effectively changes collection_is_mt from
contact ID in report->field
to
(device is Win8 => collection is finger) && contact ID in report->field
Some devices erroneously report Pen for fingers, and Win8 stylus-on-touchscreen
devices report contact ID, but mark the accompanying touchscreen device's
collection correctly
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
Acked-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hid/hid-multitouch.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -604,9 +604,13 @@ static struct mt_report_data *mt_allocat
if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
continue;
- for (n = 0; n < field->report_count; n++) {
- if (field->usage[n].hid == HID_DG_CONTACTID)
- rdata->is_mt_collection = true;
+ if (field->logical == HID_DG_FINGER || td->hdev->group != HID_GROUP_MULTITOUCH_WIN_8) {
+ for (n = 0; n < field->report_count; n++) {
+ if (field->usage[n].hid == HID_DG_CONTACTID) {
+ rdata->is_mt_collection = true;
+ break;
+ }
+ }
}
}
Patches currently in stable-queue which might be from nabijaczleweli@xxxxxxxxxxxxxxxxxx are
queue-5.10/hid-multitouch-require-finger-field-to-mark-win8-reports-as-mt.patch
