linux-kernel - [PATCH] HID: lenovo: Restrict detection of patched firmware only to USB cptkbd

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Date:   Tue, 12 Dec 2023 15:31:48 +0200
From:   Mikhail Khvainitski <me@...oinitsky.org>
To:     jikos@...nel.org, benjamin.tissoires@...hat.com
Cc:     me@...oinitsky.org, iam@...dikss.org.ru, jekhor@...il.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] HID: lenovo: Restrict detection of patched firmware only to USB cptkbd

Commit 46a0a2c96f0f ("HID: lenovo: Detect quirk-free fw on cptkbd and
stop applying workaround") introduced a regression for ThinkPad
TrackPoint Keyboard II which has similar quirks to cptkbd (so it uses
the same workarounds) but slightly different so that there are
false-positives during detecting well-behaving firmware. This commit
restricts detecting well-behaving firmware to the only model which
known to have one and have stable enough quirks to not cause
false-positives.

Fixes: 46a0a2c96f0f ("HID: lenovo: Detect quirk-free fw on cptkbd and stop applying workaround")
Link: https://lore.kernel.org/linux-input/ZXRiiPsBKNasioqH@jekhomev/
Link: https://bbs.archlinux.org/viewtopic.php?pid=2135468#p2135468
Signed-off-by: Mikhail Khvainitski <me@...oinitsky.org>
Tested-by: Yauhen Kharuzhy <jekhor@...il.com>
---
 drivers/hid/hid-lenovo.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index 7c1b33be9d13..149a3c74346b 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -692,7 +692,8 @@ static int lenovo_event_cptkbd(struct hid_device *hdev,
 		 * so set middlebutton_state to 3
 		 * to never apply workaround anymore
 		 */
-		if (cptkbd_data->middlebutton_state == 1 &&
+		if (hdev->product == USB_DEVICE_ID_LENOVO_CUSBKBD &&
+				cptkbd_data->middlebutton_state == 1 &&
 				usage->type == EV_REL &&
 				(usage->code == REL_X || usage->code == REL_Y)) {
 			cptkbd_data->middlebutton_state = 3;
-- 
2.43.0