Commit 7dfe48bd authored May 27, 2025 by Kerem Karabay Committed by Jiri Kosina Jun 11, 2025

HID: multitouch: take cls->maxcontacts into account for Apple Touch Bar even...

HID: multitouch: take cls->maxcontacts into account for Apple Touch Bar even without a HID_DG_CONTACTMAX field

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@kernel.org>
Signed-off-by: Kerem Karabay <kekrby@gmail.com>
Co-developed-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

parent e0976a61

drivers/hid/hid-multitouch.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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;