al_get_haptic_from_display man page
al_get_haptic_from_display — Allegro 5 API If the display has haptic capabilities, returns the associated haptic device handle. Otherwise returns NULL. 5.1.8 [Unstable API]: Perhaps could be simplified due to limited support for all the exposed features across all of the platforms. Awaiting feedback from users.Synopsis
#include <allegro5/allegro.h>
ALLEGRO_HAPTIC *al_get_haptic_from_display(ALLEGRO_DISPLAY *dev)Description
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Allegro reference manual