return class_register(&usb_host_class);
int retval = 0;  usb_host_class = class_create(THIS_MODULE, "usb_host"); if (IS_ERR(usb_host_class)) retval = PTR_ERR(usb_host_class); return retval;
int usb_host_init(void){	return class_register(&usb_host_class);}