linux-kernel - [PATCH v4 4/10] HID: multitouch: support getting the contact ID from HID_DG_TRANSDUCER

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Message-ID: <B21BBDDA-04A2-4D0E-9EAE-F1D57BA5A8A1@live.com>
Date: Sat, 10 Aug 2024 08:49:31 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: "tzimmermann@...e.de" <tzimmermann@...e.de>,
	"maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>,
	"mripard@...nel.org" <mripard@...nel.org>, "airlied@...il.com"
	<airlied@...il.com>, "daniel@...ll.ch" <daniel@...ll.ch>, Jiri Kosina
	<jikos@...nel.org>, "bentiss@...nel.org" <bentiss@...nel.org>
CC: Kerem Karabay <kekrby@...il.com>, Linux Kernel Mailing List
	<linux-kernel@...r.kernel.org>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "linux-input@...r.kernel.org"
	<linux-input@...r.kernel.org>, Orlando Chamberlain <orlandoch.dev@...il.com>
Subject: [PATCH v4 4/10] HID: multitouch: support getting the contact ID from
 HID_DG_TRANSDUCER_INDEX fields

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

This is needed to support Apple Touch Bars, where the contact ID is
contained in fields with the HID_DG_TRANSDUCER_INDEX usage.

Signed-off-by: Kerem Karabay <kekrby@...il.com>
Signed-off-by: Aditya Garg <gargaditya08@...e.com>
---
 drivers/hid/hid-multitouch.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 56fc78841..3e92789ed 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -635,7 +635,9 @@ static struct mt_report_data *mt_allocate_report_data(struct mt_device *td,
 
 		if (field->logical == HID_DG_FINGER || td->hdev->group != HID_GROUP_MULTITOUCH_WIN_8) {
 			for (n = 0; n < field->report_count; n++) {
-				if (field->usage[n].hid == HID_DG_CONTACTID) {
+				unsigned int hid = field->usage[n].hid;
+
+				if (hid == HID_DG_CONTACTID || hid == HID_DG_TRANSDUCER_INDEX) {
 					rdata->is_mt_collection = true;
 					break;
 				}
@@ -814,6 +816,7 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 			MT_STORE_FIELD(tip_state);
 			return 1;
 		case HID_DG_CONTACTID:
+		case HID_DG_TRANSDUCER_INDEX:
 			MT_STORE_FIELD(contactid);
 			app->touches_by_report++;
 			return 1;
-- 
2.43.0