InvalidArgumentException in Manager.php line 90: Driver [linkedin] not supported

I'm trying to get work with social authentication using liknedin provider in Laravel 5.1 but it's giving me that exception. I have implemented such authentication using "github" and "google" providers,but this one sounds weird regarding linkedin provider is built-in in Laravel 5.1

This is my redirect function

      public function redirectToProvider($provider)
     {
       return Socialite::driver($provider)->redirect();
     }

via Chebli Mohamed