ABS_MT_FIRST
bit_count(evdev->ev_abs_flags, ABS_MT_FIRST, MT_CNT, &res);
case ABS_MT_FIRST ... ABS_MT_LAST:
#define ABS_IS_MT(x) ((x) >= ABS_MT_FIRST && (x) <= ABS_MT_LAST)
#define ABS_MT_INDEX(x) ((x) - ABS_MT_FIRST)
bit_foreach_at(evdev->ev_abs_flags, ABS_MT_FIRST, ABS_MT_LAST + 1, i)
evdev_support_abs(sc->evdev, ABS_MT_FIRST + i,
evdev_support_abs(sc->evdev, ABS_MT_FIRST + i,