DSP56K_MAJOR
if(register_chrdev(DSP56K_MAJOR, "dsp56k", &dsp56k_fops)) {
device_create(&dsp56k_class, NULL, MKDEV(DSP56K_MAJOR, 0), NULL,
unregister_chrdev(DSP56K_MAJOR, "dsp56k");
device_destroy(&dsp56k_class, MKDEV(DSP56K_MAJOR, 0));
unregister_chrdev(DSP56K_MAJOR, "dsp56k");