This is a note to let you know that I've just added the patch titled
HID: wacom: Read HID_DG_CONTACTMAX directly for non-generic devices
to the 4.14-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-wacom-read-hid_dg_contactmax-directly-for-non-generic-devices.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 778fbf4179991e7652e97d7f1ca1f657ef828422 Mon Sep 17 00:00:00 2001
From: Jason Gerecke <jason.gerecke@xxxxxxxxx>
Date: Wed, 1 Apr 2020 14:23:29 -0700
Subject: HID: wacom: Read HID_DG_CONTACTMAX directly for non-generic devices
From: Jason Gerecke <jason.gerecke@xxxxxxxxx>
commit 778fbf4179991e7652e97d7f1ca1f657ef828422 upstream.
We've recently switched from extracting the value of HID_DG_CONTACTMAX
at a fixed offset (which may not be correct for all tablets) to
injecting the report into the driver for the generic codepath to handle.
Unfortunately, this change was made for *all* tablets, even those which
aren't generic. Because `wacom_wac_report` ignores reports from non-
generic devices, the contact count never gets initialized. Ultimately
this results in the touch device itself failing to probe, and thus the
loss of touch input.
This commit adds back the fixed-offset extraction for non-generic devices.
Link: https://github.com/linuxwacom/input-wacom/issues/155
Fixes: 184eccd40389 ("HID: wacom: generic: read HID_DG_CONTACTMAX from any feature report")
Signed-off-by: Jason Gerecke <jason.gerecke@xxxxxxxxx>
Reviewed-by: Aaron Armstrong Skomra <aaron.skomra@xxxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # 5.3+
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hid/wacom_sys.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -132,9 +132,11 @@ static void wacom_feature_mapping(struct
data[0] = field->report->id;
ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
data, n, WAC_CMD_RETRIES);
- if (ret == n) {
+ if (ret == n && features->type == HID_GENERIC) {
ret = hid_report_raw_event(hdev,
HID_FEATURE_REPORT, data, n, 0);
+ } else if (ret == 2 && features->type != HID_GENERIC) {
+ features->touch_max = data[1];
} else {
features->touch_max = 16;
hid_warn(hdev, "wacom_feature_mapping: "
Patches currently in stable-queue which might be from jason.gerecke@xxxxxxxxx are
queue-4.14/hid-wacom-read-hid_dg_contactmax-directly-for-non-generic-devices.patch
