input_mt_get_slot_by_key — return slot matching key
int input_mt_get_slot_by_key ( | struct input_dev * dev, |
int key); |
Returns the slot of the given key, if it exists, otherwise set the key on the first unused slot and return.
If no available slot can be found, -1 is returned.
Note that for this function to work properly, input_mt_sync_frame has
to be called at each frame.