ONLRET
ttyprintk_driver->init_termios.c_oflag = OPOST | OCRNL | ONOCR | ONLRET;
driver->init_termios.c_oflag = OPOST | OCRNL | ONOCR | ONLRET;
#define O_ONLRET(tty) _O_FLAG((tty), ONLRET)