al_get_haptic_from_joystick - Allegro 5 API

       If  the joystick has haptic capabilities, returns the associated haptic device handle.  Otherwise returns
       NULL.  It’s necessary to call this again every time the joystick configuration changes, such  as  through
       hot plugging.  In that case, the old haptic device must be released using al_release_haptic(3alleg5).

       al_get_haptic_from_joystick - Allegro 5 API

       5.1.8

              [UnstableAPI]:  Perhaps  could be simplified due to limited support for all the exposed features
              across all of the platforms.  Awaiting feedback from users.

Allegro reference manual                                                    al_get_haptic_from_joystick(3alleg5)

              #include <allegro5/allegro.h>

              ALLEGRO_HAPTIC *al_get_haptic_from_joystick(ALLEGRO_JOYSTICK *dev)