input_mt_init_slots (9)

int input_mt_init_slots(struct input_dev * dev, unsigned int num_slots, unsigned int flags);

dev

input device supporting MT events and finger tracking

num_slots

number of slots used by the device

flags

mt tasks to handle in core

This function allocates all necessary memory for MT slot handling in the input device, prepares the ABS_MT_SLOT and ABS_MT_TRACKING_ID events for use and sets up appropriate buffers. Depending on the flags set, it also performs pointer emulation and frame synchronization.

May be called repeatedly. Returns -EINVAL if attempting to reinitialize with a different number of slots.