Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Benjamin Tissoires <benjamin.tissoires@redhat.com>
To:     Jiri Kosina <jikos@kernel.org>,
        Stefan Hansson <newbie13xd@gmail.com>,
        =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= <jose.exposito89@gmail.com>
Cc:     linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@redhat.com>
Subject: [PATCH] HID: input: fix uclogic tablets
Date:   Mon, 22 Aug 2022 08:22:47 +0200
Message-Id: <20220822062247.1146141-1-benjamin.tissoires@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

commit 87562fcd1342 ("HID: input: remove the need for HID_QUIRK_INVERT")
made the assumption that it was the only one handling tablets and thus
kept an internal state regarding the tool.

Turns out that the uclogic driver has a timer to release the in range
bit, effectively making hid-input ignoring all in range information
after the very first one.

Fix that by having a more rationale approach which consists in forwarding
every event and let the input stack filter out the duplicates.

Reported-by: Stefan Hansson <newbie13xd@gmail.com>
Fixes: 87562fcd1342 ("HID: input: remove the need for HID_QUIRK_INVERT")
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
 drivers/hid/hid-input.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 48c1c02c69f4..871a185a0f1f 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -1532,7 +1532,10 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 			 * assume ours
 			 */
 			if (!report->tool)
-				hid_report_set_tool(report, input, usage->code);
+				report->tool = usage->code;
+
+			/* drivers may have changed the value behind our back, resend it */
+			hid_report_set_tool(report, input, report->tool);
 		} else {
 			hid_report_release_tool(report, input, usage->code);
 		}
-- 
2.37.1