linux-kernel - [PATCH v3 3/5] HID: multitouch: take cls->maxcontacts into account for Apple Touch Bar even without a HID_DG

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Message-ID:
 <PN3PR01MB959786A9957498A707EA4FB1B864A@PN3PR01MB9597.INDPRD01.PROD.OUTLOOK.COM>
Date: Tue, 27 May 2025 22:13:15 +0530
From: Aditya Garg <gargaditya08@...e.com>
To: Jiri Kosina <jikos@...nel.org>,
	Jiri Kosina <jkosina@...e.com>,
	Benjamin Tissoires <bentiss@...nel.org>
Cc: Kerem Karabay <kekrby@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Input Mailing List <linux-input@...r.kernel.org>
Subject: [PATCH v3 3/5] HID: multitouch: take cls->maxcontacts into account for Apple Touch Bar even without a HID_DG_CONTACTMAX field

From: Kerem Karabay <kekrby@...il.com>

In Apple Touch Bar, the HID_DG_CONTACTMAX is not present, but the maximum
contact count is still greater than the default. Add quirks for the same.

Acked-by: Benjamin Tissoires <bentiss@...nel.org>
Signed-off-by: Kerem Karabay <kekrby@...il.com>
Co-developed-by: Aditya Garg <gargaditya08@...e.com>
Signed-off-by: Aditya Garg <gargaditya08@...e.com>
---
 drivers/hid/hid-multitouch.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 99ecf6c8e..f71500d1f 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -1335,6 +1335,13 @@ static int mt_touch_input_configured(struct hid_device *hdev,
 	struct input_dev *input = hi->input;
 	int ret;
 
+	/*
+	 * HID_DG_CONTACTMAX field is not present on Apple Touch Bars,
+	 * but the maximum contact count is greater than the default.
+	 */
+	if (cls->quirks & MT_QUIRK_APPLE_TOUCHBAR && cls->maxcontacts)
+		td->maxcontacts = cls->maxcontacts;
+
 	if (!td->maxcontacts)
 		td->maxcontacts = MT_DEFAULT_MAXCONTACT;
 
-- 
2.43.0