linux-kernel - [PATCH v2 04/12] HID: input: tag touchscreens as such if the physical is not there

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Date:   Thu,  3 Feb 2022 15:32:18 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Ahelenia Ziemiańska 
        <nabijaczleweli@...ijaczleweli.xyz>,
        Ping Cheng <pinglinux@...il.com>,
        Aaron Armstrong Skomra <skomra@...il.com>,
        Jason Gerecke <killertofu@...il.com>,
        Peter Hutterer <peter.hutterer@...-t.net>
Cc:     linux-input@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH v2 04/12] HID: input: tag touchscreens as such if the physical is not there

Some devices (Elan, Synaptics...) are sometimes not setting a physical
in their finger collections. hid-input will consider them to be pen
devices, leading to some wrong behavior in user space.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---
 drivers/hid/hid-input.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 112901d2d8d2..d2562497a726 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -828,10 +828,31 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 			break;
 
 		case 0x32: /* InRange */
-			switch (field->physical & 0xff) {
-			case 0x21: map_key(BTN_TOOL_MOUSE); break;
-			case 0x22: map_key(BTN_TOOL_FINGER); break;
-			default: map_key(BTN_TOOL_PEN); break;
+			switch (field->physical) {
+			case HID_DG_PUCK:
+				map_key(BTN_TOOL_MOUSE);
+				break;
+			case HID_DG_FINGER:
+				map_key(BTN_TOOL_FINGER);
+				break;
+			default:
+				/*
+				 * If the physical is not given,
+				 * rely on the application.
+				 */
+				if (!field->physical) {
+					switch (field->application) {
+					case HID_DG_TOUCHSCREEN:
+					case HID_DG_TOUCHPAD:
+						map_key_clear(BTN_TOOL_FINGER);
+						break;
+					default:
+						map_key_clear(BTN_TOOL_PEN);
+					}
+				} else {
+					map_key(BTN_TOOL_PEN);
+				}
+				break;
 			}
 			break;
 
-- 
2.33.1