GL518_REG_VIN1_LIMIT
val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);