diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 6aefd3511a8ddb5691dd00c96ac1defa162d86ac..d6c53c622b6c1a445bbf9439de8163f6580877ab 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -944,7 +944,8 @@ static ssize_t sony_nc_sysfs_store(struct device *dev,
 			       struct device_attribute *attr,
 			       const char *buffer, size_t count)
 {
-	int value, ret = 0;
+	unsigned long value = 0;
+	int ret = 0;
 	struct sony_nc_value *item =
 	    container_of(attr, struct sony_nc_value, devattr);
 
@@ -954,7 +955,8 @@ static ssize_t sony_nc_sysfs_store(struct device *dev,
 	if (count > 31)
 		return -EINVAL;
 
-	value = simple_strtoul(buffer, NULL, 10);
+	if (kstrtoul(buffer, 10, &value))
+		return -EINVAL;
 
 	if (item->validate)
 		value = item->validate(SNC_VALIDATE_IN, value);
@@ -962,8 +964,8 @@ static ssize_t sony_nc_sysfs_store(struct device *dev,
 	if (value < 0)
 		return value;
 
-	ret = sony_nc_int_call(sony_nc_acpi_handle, *item->acpiset, &value,
-			NULL);
+	ret = sony_nc_int_call(sony_nc_acpi_handle, *item->acpiset,
+			(int *)&value, NULL);
 	if (ret < 0)
 		return -EIO;
 
@@ -1445,7 +1447,7 @@ static ssize_t sony_nc_kbd_backlight_mode_store(struct device *dev,
 	if (count > 31)
 		return -EINVAL;
 
-	if (strict_strtoul(buffer, 10, &value))
+	if (kstrtoul(buffer, 10, &value))
 		return -EINVAL;
 
 	ret = __sony_nc_kbd_backlight_mode_set(value);
@@ -1489,7 +1491,7 @@ static ssize_t sony_nc_kbd_backlight_timeout_store(struct device *dev,
 	if (count > 31)
 		return -EINVAL;
 
-	if (strict_strtoul(buffer, 10, &value))
+	if (kstrtoul(buffer, 10, &value))
 		return -EINVAL;
 
 	ret = __sony_nc_kbd_backlight_timeout_set(value);
@@ -2439,7 +2441,9 @@ static ssize_t sony_pic_wwanpower_store(struct device *dev,
 	if (count > 31)
 		return -EINVAL;
 
-	value = simple_strtoul(buffer, NULL, 10);
+	if (kstrtoul(buffer, 10, &value))
+		return -EINVAL;
+
 	mutex_lock(&spic_dev.lock);
 	__sony_pic_set_wwanpower(value);
 	mutex_unlock(&spic_dev.lock);
@@ -2476,7 +2480,9 @@ static ssize_t sony_pic_bluetoothpower_store(struct device *dev,
 	if (count > 31)
 		return -EINVAL;
 
-	value = simple_strtoul(buffer, NULL, 10);
+	if (kstrtoul(buffer, 10, &value))
+		return -EINVAL;
+
 	mutex_lock(&spic_dev.lock);
 	__sony_pic_set_bluetoothpower(value);
 	mutex_unlock(&spic_dev.lock);
@@ -2515,7 +2521,9 @@ static ssize_t sony_pic_fanspeed_store(struct device *dev,
 	if (count > 31)
 		return -EINVAL;
 
-	value = simple_strtoul(buffer, NULL, 10);
+	if (kstrtoul(buffer, 10, &value))
+		return -EINVAL;
+
 	if (sony_pic_set_fanspeed(value))
 		return -EIO;