From: Takashi Iwai <tiwai@suse.de>

Subject: [PATCH] Input: elan_i2c: Add deny list for Lenovo Yoga Slim 7

Date: Fri, 04 Feb 2022 17:57:14 +0100

Message-ID: <s5hleyqwowl.wl-tiwai@suse.de>

Patch-mainline: Submitted, linux-input ML

References: bsc#1193064

The touchpad on Lenovo Yoga Slim 7 doesn't work well with elan-i2c but

rather better with i2c-hid.  Add a deny list for avoiding to bind with

elan-i2c.

BugLink: https://bugzilla.opensuse.org/show_bug.cgi?id=1193064

Signed-off-by: Takashi Iwai <tiwai@suse.de>

---

 drivers/input/mouse/elan_i2c_core.c | 19 +++++++++++++++++++

 1 file changed, 19 insertions(+)

--- a/drivers/input/mouse/elan_i2c_core.c

+++ b/drivers/input/mouse/elan_i2c_core.c

@@ -18,6 +18,7 @@

 #include <linux/acpi.h>

 #include <linux/delay.h>

 #include <linux/device.h>

+#include <linux/dmi.h>

 #include <linux/firmware.h>

 #include <linux/i2c.h>

 #include <linux/init.h>

@@ -1187,6 +1188,20 @@ static void elan_disable_regulator(void *_data)

 	regulator_disable(data->vcc);

 }

+static const struct dmi_system_id elan_i2c_denylist[] = {

+#if IS_ENABLED(CONFIG_I2C_HID_ACPI)

+	{

+		/* Lenovo Yoga Slim 7 is better supported by i2c-hid */

+		.matches = {

+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),

+			DMI_MATCH(DMI_PRODUCT_NAME, "82A3"),

+			DMI_MATCH(DMI_PRODUCT_VERSION, "Yoga Slim 7 14ITL05"),

+		},

+	},

+#endif

+	{ }

+};

+

 static int elan_probe(struct i2c_client *client)

 {

 	const struct elan_transport_ops *transport_ops;

@@ -1197,6 +1212,10 @@ static int elan_probe(struct i2c_client *client)

 	if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&

 	    i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {

+		if (dmi_check_system(elan_i2c_denylist)) {

+			dev_info(dev, "Hits deny list, skipping\n");

+			return -ENODEV;

+		}

 		transport_ops = &elan_i2c_ops;

 	} else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&

 		   i2c_check_functionality(client->adapter,