From e0ae2519ca004a628fa55aeef969c37edce522d3 Mon Sep 17 00:00:00 2001
From: ??? <kt.liao@emc.com.tw>
Date: Thu, 21 Jun 2018 17:15:32 -0700
Subject: [PATCH] Input: elantech - fix V4 report decoding for module with middle key
Git-commit: e0ae2519ca004a628fa55aeef969c37edce522d3
Patch-mainline: v4.18-rc3
References: bsc#1051510

Some touchpad has middle key and it will be indicated in bit 2 of packet[0].
We need to fix V4 formation's byte mask to prevent error decoding.

Signed-off-by: KT Liao <kt.liao@emc.com.tw>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/input/mouse/elantech.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -800,7 +800,7 @@ static int elantech_packet_check_v4(stru
 	else if (ic_version == 7 && etd->samples[1] == 0x2A)
 		sanity_check = ((packet[3] & 0x1c) == 0x10);
 	else
-		sanity_check = ((packet[0] & 0x0c) == 0x04 &&
+		sanity_check = ((packet[0] & 0x08) == 0x00 &&
 				(packet[3] & 0x1c) == 0x10);
 
 	if (!sanity_check)