Patch "Input: elan_i2c - properly wake up touchpad on ASUS laptops" has been added to the 4.7-stable tree

@@ -4,7 +4,8 @@
  * Copyright (c) 2013 ELAN Microelectronics Corp.
  *
  * Author: 林政維 (Duson Lin) <[email protected]>
- * Version: 1.6.0
+ * Author: KT Liao <[email protected]>
+ * Version: 1.6.2
  *
  * Based on cyapa driver:
  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.

@@ -40,7 +41,7 @@
 #include "elan_i2c.h"
 
 #define DRIVER_NAME		"elan_i2c"
-#define ELAN_DRIVER_VERSION	"1.6.1"
+#define ELAN_DRIVER_VERSION	"1.6.2"
 #define ELAN_VENDOR_ID		0x04f3
 #define ETP_MAX_PRESSURE	255
 #define ETP_FWIDTH_REDUCE	90

@@ -199,9 +200,41 @@ static int elan_sleep(struct elan_tp_dat
 	return error;
 }
 
+static int elan_query_product(struct elan_tp_data *data)
+{
+	int error;
+
+	error = data->ops->get_product_id(data->client, &data->product_id);
+	if (error)
+		return error;
+
+	error = data->ops->get_sm_version(data->client, &data->ic_type,
+					  &data->sm_version);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
+{
+	if (data->ic_type != 0x0E)
+		return false;
+
+	switch (data->product_id) {
+	case 0x05 ... 0x07:
+	case 0x09:
+	case 0x13:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static int __elan_initialize(struct elan_tp_data *data)
 {
 	struct i2c_client *client = data->client;
+	bool woken_up = false;
 	int error;
 
 	error = data->ops->initialize(client);

@@ -210,6 +243,27 @@ static int __elan_initialize(struct elan
 		return error;
 	}
 
+	error = elan_query_product(data);
+	if (error)
+		return error;
+
+	/*
+	 * Some ASUS devices were shipped with firmware that requires
+	 * touchpads to be woken up first, before attempting to switch
+	 * them into absolute reporting mode.
+	 */
+	if (elan_check_ASUS_special_fw(data)) {
+		error = data->ops->sleep_control(client, false);
+		if (error) {
+			dev_err(&client->dev,
+				"failed to wake device up: %d\n", error);
+			return error;
+		}
+
+		msleep(200);
+		woken_up = true;
+	}
+
 	data->mode |= ETP_ENABLE_ABS;
 	error = data->ops->set_mode(client, data->mode);
 	if (error) {

@@ -218,11 +272,13 @@ static int __elan_initialize(struct elan
 		return error;
 	}
 
-	error = data->ops->sleep_control(client, false);
-	if (error) {
-		dev_err(&client->dev,
-			"failed to wake device up: %d\n", error);
-		return error;
+	if (!woken_up) {
+		error = data->ops->sleep_control(client, false);
+		if (error) {
+			dev_err(&client->dev,
+				"failed to wake device up: %d\n", error);
+			return error;
+		}
 	}
 
 	return 0;

@@ -248,10 +304,6 @@ static int elan_query_device_info(struct
 {
 	int error;
 
-	error = data->ops->get_product_id(data->client, &data->product_id);
-	if (error)
-		return error;
-
 	error = data->ops->get_version(data->client, false, &data->fw_version);
 	if (error)
 		return error;

@@ -261,11 +313,6 @@ static int elan_query_device_info(struct
 	if (error)
 		return error;
 
-	error = data->ops->get_sm_version(data->client, &data->ic_type,
-					  &data->sm_version);
-	if (error)
-		return error;
-
 	error = data->ops->get_version(data->client, true, &data->iap_version);
 	if (error)
 		return error;