Create force-feedback device
int input_ff_create(struct input_dev * dev, unsigned int max_effects);
dev
input device supporting force-feedback
max_effects
maximum number of effects supported by the device
This function allocates all necessary memory for a force feedback portion of an input device and installs all default handlers. dev->ffbit should be already set up before calling this function. Once ff device is created you need to setup its upload, erase, playback and other handlers before registering input device