tree 56bdfb0d58cfa0122a501b2cef82dfaf2b723612
parent 15d8fee68f3b8bf3a1bb3b728a8dce752af25c1d
author Tao Jin <tao-j@outlook.com> 1653018692 -0400
committer Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> 1715984547 +0000

BACKPORT: HID: multitouch: new device class fix Lenovo X12 trackpad sticky

The trackpad of the given device sends continuous report of pointers
status as per wxn8 spec. However, the spec did not clarify when the
fingers are lifted so fast that between the interval of two report
frames fingers on pad reduced from >=2 to 0. The second last report
contains >=2 fingers with tip state 1 and the last report contains only
1 finger with tip state 0. Although this can happen unfrequently, a
  quick fix will be improve the consistency to 100%. A quick fix is to
disable MT_QUIRK_ALWAYS_VALID and enable MT_QUIRK_NOT_SEEN_MEANS_UP.

Test for hid-tools is added in [1]

In addition to this, I2C device 04CA:00B1 may also need similar class
but with MT_QUIRK_FORCE_MULTI_INPUT disabled (but it does not harm to
 enable it on non-multi-input device either). The respective owner has
been notified and a patch may coming soon after test.

[1]: https://gitlab.freedesktop.org/libevdev/hid-tools/-/merge_requests/130

Signed-off-by: Tao Jin <tao-j@outlook.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
(cherry picked from commit 54eed5c7b938dc4ef6b14d4ee048bbdafdbce352)

Conflicts:
   drivers/hid/hid-multitouch.c
Context conflicts, and don't add the new device class to confidence bit
handling, since the old class doesn't handle it either.

BUG=b:335414032
TEST=Not done.

Change-Id: Idfcd2ab01f45299de7c3efe0665c494e1d39bb32
Signed-off-by: seobrien <seobrien@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5497934
Reviewed-by: Kenneth Albanowski <kenalba@google.com>