fd = open("/dev/ttySX", O_RDONLY | O_NOCTTY);
    /* At this point, N_TCH is attached to /dev/ttySX, the serial port used
       by the touch controller. Switch to N_TTY */
    ldisc = N_TTY;
    ioctl(fd, TIOCSETD, &ldisc);
    /* Set termios to raw mode and dump the data coming in */
    /* ... */