centos man page for input_ff_create

INPUT_FF_CREATE(9)						  Input Subsystem						INPUT_FF_CREATE(9)

NAME
       input_ff_create - create force-feedback device

SYNOPSIS
       int input_ff_create(struct input_dev * dev, unsigned int max_effects);

ARGUMENTS
       dev
	   input device supporting force-feedback

       max_effects
	   maximum number of effects supported by the device

DESCRIPTION
       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

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							INPUT_FF_CREATE(9)