input_ff_create — create force-feedback device
|struct input_dev * dev,|
|unsigned int max_effects|
input device supporting force-feedback
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