linux-kernel - [PATCH 1/2] Revert "HID: multitouch: enable palm rejection if device implements confidence usage"

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Date:	Thu, 23 Jun 2016 16:31:29 +0800
From:	Allen Hung <allen_hung@...l.com>
To:	Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:	linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Allen Hung <allen_hung@...l.com>
Subject: [PATCH 1/2] Revert "HID: multitouch: enable palm rejection if device implements confidence usage"

This reverts commit 25a84db15b3f ("HID: multitouch: enable palm rejection
if device implements confidence usage")

The commit enables palm rejection for Win8 Precision Touchpad devices but
the quirk MT_QUIRK_VALID_IS_CONFIDENCE it is using is not working very
properly. This quirk is originally designed for some WIn7 touchscreens. Use
of this for a Win8 Precision Touchpad will cause unexpected pointer jumping
problem.

Signed-off-by: Allen Hung <allen_hung@...l.com>
---
 drivers/hid/hid-multitouch.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 95b7d61..4ef7006 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -502,11 +502,6 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 			mt_store_field(usage, td, hi);
 			return 1;
 		case HID_DG_CONFIDENCE:
-			if (cls->name == MT_CLS_WIN_8 &&
-				field->application == HID_DG_TOUCHPAD) {
-				cls->quirks &= ~MT_QUIRK_ALWAYS_VALID;
-				cls->quirks |= MT_QUIRK_VALID_IS_CONFIDENCE;
-			}
 			mt_store_field(usage, td, hi);
 			return 1;
 		case HID_DG_TIPSWITCH:
-- 
2.7.4