linux-kernel - [PATCH] Input: synaptics - disable intertouch for Lenovo L440

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Date:   Wed, 12 Apr 2023 17:54:17 -0500
From:   Jonathan Denose <jdenose@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-input@...r.kernel.org, Jonathan Denose <jdenose@...gle.com>,
        Aman Dhoot <amandhoot12@...il.com>,
        Lyude Paul <lyude@...hat.com>,
        Mark Pearson <markpearson@...ovo.com>
Subject: [PATCH] Input: synaptics - disable intertouch for Lenovo L440

When intertouch is enabled for the L440 a (deep)sleep/resume
cycle causes the touchpad driver to hang which causes the
touchpad to become unresponsive. Disable intertouch resolves
this issue and the touchpad is fine after resume from sleep.

Additionally, when the PNP id for the L440 is only removed
from the topbuttonpad_pnp_ids list, a message is logged to
enable psmouse.synaptics_intertouch, which would cause the
sleep/resume issue again. By removing the PNP id from
topbutton_pnp_ids and then adding it to the
forcepad_pnp_ids array, intertouch is disabled and the
message is not logged.

Signed-off-by: Jonathan Denose <jdenose@...gle.com>
---

 drivers/input/mouse/synaptics.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index fa021af8506e4..77a4f58128e84 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -150,7 +150,6 @@ static const char * const topbuttonpad_pnp_ids[] = {
 	"LEN2001", /* Edge E431 */
 	"LEN2002", /* Edge E531 */
 	"LEN2003",
-	"LEN2004", /* L440 */
 	"LEN2005",
 	"LEN2006", /* Edge E440/E540 */
 	"LEN2007",
@@ -198,6 +197,7 @@ static const char * const smbus_pnp_ids[] = {
 static const char * const forcepad_pnp_ids[] = {
 	"SYN300D",
 	"SYN3014",
+	"LEN2004", /* L440 */
 	NULL
 };
 
@@ -1769,6 +1769,8 @@ static int synaptics_create_intertouch(struct psmouse *psmouse,
 		.flags = I2C_CLIENT_HOST_NOTIFY,
 	};
 
+	psmouse_dbg(psmouse, "topbuttonpad is: %s\n", topbuttonpad ? "true" : "false");
+
 	return psmouse_smbus_init(psmouse, &intertouch_board,
 				  &pdata, sizeof(pdata), true,
 				  leave_breadcrumbs);
-- 
2.40.0.577.gac1e443424-goog