linux-kernel - [PATCH] input/i8042: Add quirk table to disable aux port on Clevo NS70MU

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Date:   Fri, 14 Jan 2022 18:00:30 +0100
From:   Werner Sembach <wse@...edocomputers.com>
To:     dmitry.torokhov@...il.com, tiwai@...e.com, mpdesouza@...e.com,
        arnd@...db.de, samuel@...oj.net, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] input/i8042: Add quirk table to disable aux port on Clevo NS70MU

At least one modern Clevo barebone has the touchpad connected both via PS/2
and i2c interface. This causes a race condition between the psmouse and
i2c-hid driver. Since the full capability if the touchpad is available via
the i2c interface and the device has no external PS/2 port, it is save to
just ignore all ps2 mouses here to avoid this issue.

The know affected device is the Clevo NS70MU.

This patch add a new i8042_dmi_noaux_table with the dmi strings of the
affected device of different revisions. The table is then evaluated like
the other quirk tables in the i8042 driver.

Signed-off-by: Werner Sembach <wse@...edocomputers.com>
---
 drivers/input/serio/i8042-x86ia64io.h | 42 +++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index 148a7c5fd0e2..48ad6247a1a0 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -1013,6 +1013,45 @@ static const struct dmi_system_id i8042_dmi_probe_defer_table[] __initconst = {
 	{ }
 };
 
+static const struct dmi_system_id i8042_dmi_noaux_table[] __initconst = {
+	/*
+	 * At least one modern Clevo barebone has the touchpad connected
+	 * both via PS/2 and i2c interface. This causes a race condition
+	 * between the psmouse and i2c-hid driver. Since the full
+	 * capability if the touchpad is available via the i2c interface
+	 * and the device has no external PS/2 port, it is save to just
+	 * ignore all ps2 mouses here to avoid this issue.
+	 * The know affected device is the
+	 * TUXEDO InfinityBook S17 Gen6 / Clevo NS70MU which comes with
+	 * one of the 4 different dmi string combinations below.
+	 */
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
+			DMI_MATCH(DMI_BOARD_NAME, "NS50MU"),
+		},
+	},
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
+			DMI_MATCH(DMI_BOARD_NAME, "NS50_70MU"),
+		},
+	},
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Notebook"),
+			DMI_MATCH(DMI_BOARD_NAME, "NS50MU"),
+		},
+	},
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Notebook"),
+			DMI_MATCH(DMI_BOARD_NAME, "NS50_70MU"),
+		},
+	},
+	{ }
+};
+
 #endif /* CONFIG_X86 */
 
 #ifdef CONFIG_PNP
@@ -1336,6 +1375,9 @@ static int __init i8042_platform_init(void)
 	if (dmi_check_system(i8042_dmi_probe_defer_table))
 		i8042_probe_defer = true;
 
+	if (dmi_check_system(i8042_dmi_noaux_table))
+		i8042_noaux = true;
+
 	/*
 	 * A20 was already enabled during early kernel init. But some buggy
 	 * BIOSes (in MSI Laptops) require A20 to be enabled using 8042 to
-- 
2.25.1