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INPUT_MT_ASSIGN_SLOT(9) Input Subsystem INPUT_MT_ASSIGN_SLOT(9)

NAME

input_mt_assign_slots - perform a best-match assignment

SYNOPSIS

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

ARGUMENTS

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

dmax

maximum ABS_MT_POSITION displacement (zero for infinite)

DESCRIPTION

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

The assignments are balanced so that all coordinate displacements are below the euclidian distance dmax. If no such assignment can be found, some contacts are assigned to unused slots.

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

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June 2024 Kernel Hackers Manual 3.10