[fw-general] How to configure this route

[Php (Absolom)]

Hi, I don't see how to implements this structure : 

/application
        /controllers
        /models
        /views
        /my_module
                /controllers
                IndexController.php
                        /admin
                                IndexController.php
                /models
                        /admin
                /views
                        /admin

I write this, and I don't see where to say that the controller directory fot 
the route : /my_module/admin is : /application//my_module/controllers/admin

Thanks for your help

$router = new Zend_Controller_Router_Rewrite();
 
$route = new Zend_Controller_Router_Route(
    "my_module/admin/",
    array(  "controller"=> 'index',
            "action"=>"index"
    )
);
$router->addRoute("admin",$route);

$controller = Zend_Controller_Front::getInstance();
$controller->setControllerDirectory(array(
    'default' => CONTROLLERS_PATH,
    'qualix'   => HOME_PATH . 'application/qualix/controllers/',
)); 
$controller->setRouter($router);
$controller->throwExceptions(true);  
$controller->dispatch();