Man page 9 : input_mt_assign_slots

input_mt_assign_slots - perform a best-match assignment

int input_mt_assign_slots(struct input_dev *  dev , int *  slots , const struct input_mt_pos *  pos , int  num_pos );

dev
    input device with allocated MT slots

slots
    the slot assignment to be filled

pos
    the position array to match

num_pos
    number of positions

Performs a best match against the current contacts and returns the slot assignment list. New contacts are assigned to unused slots.

Returns zero on success, or negative error in case of failure.