Provided by: allegro5-doc_5.2.9.1+dfsg-1.1build4_all 

NAME
al_get_haptic_from_touch_input - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro.h>
ALLEGRO_HAPTIC *al_get_haptic_from_touch_input(ALLEGRO_TOUCH_INPUT *dev)
DESCRIPTION
If the touch input device has haptic capabilities, returns the associated haptic device handle. Other‐
wise returns NULL.
SINCE
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.
Allegro reference manual al_get_haptic_from_touch_input(3alleg5)