linux-kernel - [PATCH 5.3 117/197] Input: st1232 - fix reporting multitouch coordinates

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Message-Id: <20191027203358.050781046@linuxfoundation.org>
Date:   Sun, 27 Oct 2019 22:00:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dixit Parmar <dixitparmar19@...il.com>,
        Martin Kepplinger <martink@...teo.de>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 5.3 117/197] Input: st1232 - fix reporting multitouch coordinates

From: Dixit Parmar <dixitparmar19@...il.com>

commit b1a402e75a5f5127ff1ffff0615249f98df8b7b3 upstream.

For Sitronix st1633 multi-touch controller driver the coordinates reported
for multiple fingers were wrong, as it was always taking LSB of coordinates
from the first contact data.

Signed-off-by: Dixit Parmar <dixitparmar19@...il.com>
Reviewed-by: Martin Kepplinger <martink@...teo.de>
Cc: stable@...r.kernel.org
Fixes: 351e0592bfea ("Input: st1232 - add support for st1633")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204561
Link: https://lore.kernel.org/r/1566209314-21767-1-git-send-email-dixitparmar19@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/touchscreen/st1232.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/input/touchscreen/st1232.c
+++ b/drivers/input/touchscreen/st1232.c
@@ -81,8 +81,10 @@ static int st1232_ts_read_data(struct st
 	for (i = 0, y = 0; i < ts->chip_info->max_fingers; i++, y += 3) {
 		finger[i].is_valid = buf[i + y] >> 7;
 		if (finger[i].is_valid) {
-			finger[i].x = ((buf[i + y] & 0x0070) << 4) | buf[i + 1];
-			finger[i].y = ((buf[i + y] & 0x0007) << 8) | buf[i + 2];
+			finger[i].x = ((buf[i + y] & 0x0070) << 4) |
+					buf[i + y + 1];
+			finger[i].y = ((buf[i + y] & 0x0007) << 8) |
+					buf[i + y + 2];
 
 			/* st1232 includes a z-axis / touch strength */
 			if (ts->chip_info->have_z)