ADM1031_REG_CONF2
read_val = adm1031_read_value(client, ADM1031_REG_CONF2);
adm1031_write_value(client, ADM1031_REG_CONF2, read_val | mask);
data->conf2 = adm1031_read_value(client, ADM1031_REG_CONF2);