INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work, (void *)cpc_tty);
INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work, (void *)port);
INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work, (void *)cpc_tty);
INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work, (void *)port);