linux-kernel - [PATCH 4.9 18/32] Input: trackpoint - assume 3 buttons when buttons detection fails

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Message-Id: <20170908131838.381951749@linuxfoundation.org>
Date:   Fri,  8 Sep 2017 15:19:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oscar Campos <oscar.campos@...ber.fsf.org>,
        Peter Hutterer <peter.hutterer@...-t.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Aaron Ma <aaron.ma@...onical.com>
Subject: [PATCH 4.9 18/32] Input: trackpoint - assume 3 buttons when buttons detection fails

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Oscar Campos <oscar.campos@...ber.fsf.org>

commit 293b915fd9bebf33cdc906516fb28d54649a25ac upstream.

Trackpoint buttons detection fails on ThinkPad 570 and 470 series,
this makes the middle button of the trackpoint to not being recogized.
As I don't believe there is any trackpoint with less than 3 buttons this
patch just assumes three buttons when the extended button information
read fails.

Signed-off-by: Oscar Campos <oscar.campos@...ber.fsf.org>
Acked-by: Peter Hutterer <peter.hutterer@...-t.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/input/mouse/trackpoint.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/input/mouse/trackpoint.c
+++ b/drivers/input/mouse/trackpoint.c
@@ -381,8 +381,8 @@ int trackpoint_detect(struct psmouse *ps
 		return 0;
 
 	if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) {
-		psmouse_warn(psmouse, "failed to get extended button data\n");
-		button_info = 0;
+		psmouse_warn(psmouse, "failed to get extended button data, assuming 3 buttons\n");
+		button_info = 0x33;
 	}
 
 	psmouse->private = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL);