linux-kernel - [PATCH AUTOSEL 5.4 6/7] HID: multitouch: fix Asus ExpertBook P2 P2451FA trackpoint

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Message-Id: <20221227203534.1214640-6-sashal@kernel.org>
Date:   Tue, 27 Dec 2022 15:35:31 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     José Expósito <jose.exposito89@...il.com>,
        Akito <the@...to.ooo>, Jiri Kosina <jkosina@...e.cz>,
        Sasha Levin <sashal@...nel.org>, jikos@...nel.org,
        benjamin.tissoires@...hat.com, linux-input@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 6/7] HID: multitouch: fix Asus ExpertBook P2 P2451FA trackpoint

From: José Expósito <jose.exposito89@...il.com>

[ Upstream commit 4eab1c2fe06c98a4dff258dd64800b6986c101e9 ]

The HID descriptor of this device contains two mouse collections, one
for mouse emulation and the other for the trackpoint.

Both collections get merged and, because the first one defines X and Y,
the movemenent events reported by the trackpoint collection are
ignored.

Set the MT_CLS_WIN_8_FORCE_MULTI_INPUT class for this device to be able
to receive its reports.

This fix is similar to/based on commit 40d5bb87377a ("HID: multitouch:
enable multi-input as a quirk for some devices").

Link: https://gitlab.freedesktop.org/libinput/libinput/-/issues/825
Reported-by: Akito <the@...to.ooo>
Tested-by: Akito <the@...to.ooo>
Signed-off-by: José Expósito <jose.exposito89@...il.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hid/hid-multitouch.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 463a8deae37e..9db327654580 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -1953,6 +1953,10 @@ static const struct hid_device_id mt_devices[] = {
 		HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
 			USB_VENDOR_ID_ELAN, 0x313a) },
 
+	{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,
+		HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
+			USB_VENDOR_ID_ELAN, 0x3148) },
+
 	/* Elitegroup panel */
 	{ .driver_data = MT_CLS_SERIAL,
 		MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
-- 
2.35.1