Message pub/sub in angularjs

Question

I am creating a messaging service in angularjs project I am working.

(function (angular) {
    'use strict';

    angular.module('MyApp').factory('messagebus', messagebus);
    messagebus.$inject = ['$rootScope'];

    function messagebus($rootScope) {
        var factory = {
            publish: publish,
            subscribe: subscribe,
        };

        return factory;

        function publish(name, params) {
            $rootScope.$emit(name, params);
        }

        function subscribe(name, listener) {
            return $rootScope.$on(name, listener);
        }
    }
}(angular));

When I am calling the service this is what I am doing

var unregister = messagebus.subscribe('eventname', function (event, message) {
    // do something
});

$scope.$on('$destroy', function () {
    unregister();
});

I am handling unregistering part in the calling controller.

Is there something I can do in the messagebus service as a generic pattern and un register from there rather than calling unregister at each controller ?