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

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Message-ID: <F648B94F-AF64-49B1-AC91-EFBD0F8E216E@live.com>
Date: Thu, 27 Feb 2025 17:35:03 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: Jiri Kosina <jikos@...nel.org>, "jkosina@...e.com" <jkosina@...e.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>, "bentiss@...nel.org"
	<bentiss@...nel.org>
CC: Kerem Karabay <kekrby@...il.com>, Linux Kernel Mailing List
	<linux-kernel@...r.kernel.org>, "linux-input@...r.kernel.org"
	<linux-input@...r.kernel.org>
Subject: [PATCH 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.

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 70fdd8cf9..f7fe6aab8 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