evdev_support_nfingers
void evdev_support_nfingers(struct evdev_dev *, int);
evdev_support_nfingers(evdev, MAXIMAL_MT_SLOT(evdev) + 1);
evdev_support_nfingers(evdev_a, sc->synhw.capReportsV ? 5 : 3);
evdev_support_nfingers(evdev_a, ELANTECH_MAX_FINGERS);