static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
static DEVICE_ATTR(mode, 0666, show_mode, set_mode);
-struct device_attribute *attributes[] = {
+static struct device_attribute *attributes[] = {
&dev_attr_min_microvolts,
&dev_attr_max_microvolts,
&dev_attr_min_microamps,