linux-kernel - [PATCH] HID: multitouch: Add quirk for Hantick 5288 touchpad

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Message-Id: <20241216021801.22572-1-youwan@nfschina.com>
Date: Mon, 16 Dec 2024 10:18:01 +0800
From: Youwan Wang <youwan@...china.com>
To: jikos@...nel.org
Cc: bentiss@...nel.org,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	enze@...china.com,
	Youwan Wang <youwan@...china.com>
Subject: [PATCH] HID: multitouch: Add quirk for Hantick 5288 touchpad

This device sometimes doesn't send touch release signals when moving
from >=2 fingers to <2 fingers. Using MT_QUIRK_NOT_SEEN_MEANS_UP instead
of MT_QUIRK_ALWAYS_VALID makes sure that no touches become stuck.

Signed-off-by: Enze Xie <enze@...china.com>
Signed-off-by: Youwan Wang <youwan@...china.com>
---
 drivers/hid/hid-multitouch.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 42c0bd9d2f31..82900857bfd8 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -2314,6 +2314,11 @@ static const struct hid_device_id mt_devices[] = {
 		HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, USB_VENDOR_ID_SIS_TOUCH,
 			HID_ANY_ID) },
 
+	/* Hantick */
+	{ .driver_data = MT_CLS_NSMU,
+		HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
+			   I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288) },
+
 	/* Generic MT device */
 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
 
-- 
2.25.1