def button_dummy(self, cr, uid, ids, context=None):
          res = []
          valiue = {}
          print "employee",context,ids
          ename = context.get('employee_id');         
          emp_obj = self.pool.get('hr.employee')
          emp_name = emp_obj.search(cr, uid, [('name','=',ename)], context=context)
          print "emp_name",emp_name
          location_lines = []
          location_ids = self.pool.get('employee.location').search(cr, uid, [('employee_id','=',emp_name)],limit=5)
       
          for p in self.pool.get('employee.location').browse(cr, uid, location_ids):
              location_lines.append((0,0,{'current_location':p.current_location.name
                        },{'location_type':p.location_type
                        }))
            ## First i used this return to update the one2many field, but no output
          res['value']['location_line_ids']=location_lines
          return res

         ## Second i used this return to update the one2many field, but no output

          return {'value': {'location_line_ids': location_lines}}

How can i return values into one2many field using button click?

Updated question:

First i created employee.location model. Then i call employee.location(one2many) model in hr.employee. In employee.location there is a many2one employee_id field to connect both the models.

Already i added datas in employee.location using different form view. Now i just want to see the history of the employee location in the employee profile. For that

<button name="button_dummy" string="Refresh" type="object" context="{'employee_id':name,'location_line_ids':location_line_ids}"/>                      
                         <field name="location_line_ids" options="{'reload_on_button': true}">

When i click the button above function will call and just display the employee location data for only displaying. I dont want to write the datas again, only want to display the datas in each employee profile using employee_id.