Man page 9 : input_set_events_per_packet

input_set_events_per_packet - tell handlers about the driver event rate

void input_set_events_per_packet(struct input_dev *  dev , int  n_events );

dev
    the input device used by the driver

n_events
    the average number of events between calls to input_sync

If the event rate sent from a device is unusually large, use this function to set the expected event rate. This will allow handlers to set up an appropriate buffer size for the event stream, in order to minimize information loss.