static void acm_tty_set_termios(struct tty_struct *tty,
						struct ktermios *termios_old)
{
	struct acm *acm = tty->driver_data;
	struct ktermios *termios = &tty->termios;
	struct usb_cdc_line_coding newline;
	int newctrl = acm->ctrlout;

	newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
	newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
	newline.bParityType = termios->c_cflag & PARENB ?
				(termios->c_cflag & PARODD ? 1 : 2) +
				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
	switch (termios->c_cflag & CSIZE) {
	case CS5:
		newline.bDataBits = 5;
		break;
	case CS6:
		newline.bDataBits = 6;
		break;
	case CS7:
		newline.bDataBits = 7;
		break;
	case CS8:
	default:
		newline.bDataBits = 8;
		break;
	}
	/* FIXME: Needs to clear unsupported bits in the termios */
	acm->clocal = ((termios->c_cflag & CLOCAL) != 0);

	if (C_BAUD(tty) == B0) {
		newline.dwDTERate = acm->line.dwDTERate;
		newctrl &= ~ACM_CTRL_DTR;
	} else if (termios_old && (termios_old->c_cflag & CBAUD) == B0) {
		newctrl |=  ACM_CTRL_DTR;
	}

	if (newctrl != acm->ctrlout)
		acm_set_control(acm, acm->ctrlout = newctrl);

	if (memcmp(&acm->line, &newline, sizeof newline)) {
		memcpy(&acm->line, &newline, sizeof newline);
		dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
			__func__,
			le32_to_cpu(newline.dwDTERate),
			newline.bCharFormat, newline.bParityType,
			newline.bDataBits);
		acm_set_line(acm, &acm->line);
	}
}

Unknown