hwmon: Make name attribute mandatory for new APIs

It does not make sense to use one of the the new APIs when not
even providing a name attribute. Make it mandatory.
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/hwmon.c

@@ -651,6 +651,9 @@ hwmon_device_register_with_groups(struct device *dev, const char *name,
 				  void *drvdata,
 				  const struct attribute_group **groups)
 {
+	if (!name)
+		return ERR_PTR(-EINVAL);
+
 	return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 }
 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
@@ -674,6 +677,9 @@ hwmon_device_register_with_info(struct device *dev, const char *name,
 				const struct hwmon_chip_info *chip,
 				const struct attribute_group **extra_groups)
 {
+	if (!name)
+		return ERR_PTR(-EINVAL);
+
 	if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
 		return ERR_PTR(-EINVAL);
 
@@ -695,7 +701,7 @@ struct device *hwmon_device_register(struct device *dev)
 	dev_warn(dev,
 		 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
 
-	return hwmon_device_register_with_groups(dev, NULL, NULL, NULL);
+	return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
 }
 EXPORT_SYMBOL_GPL(hwmon_device_register);