static int nullmodem_open(struct tty_struct *tty, struct file *file)
{
struct nullmodem_pair *pair = &pair_table[tty->index/2];
struct nullmodem_end *end = ((tty->index&1) ? &pair->b : &pair->a);
unsigned long flags;
int index;
int err = -ENOMEM;
dprintf("%s - #%d c:%d\n", __FUNCTION__, tty->index, tty->count);
if (tty->count > 1)
return 0;
index = tty->index;
tport[index].tty=tty;
tty->port = &tport[index];
spin_lock_irqsave(&end->pair->spin, flags);
if (kfifo_alloc(&end->fifo, TX_BUF_SIZE, GFP_KERNEL))
goto exit;
tty->driver_data = end;
end->tty = tty;
end->nominal_bit_count = 0;
end->actual_bit_count = 0;
handle_termios(tty);
err = 0;
exit:
spin_unlock_irqrestore(&end->pair->spin, flags);
return err;
}
// Emulated ioctl implementation
VISIBLE
long ioctl(int fd, int cmd, void* arg)
{
IOCTL_STEP(handle_filio(fd, cmd, arg, &retval));
IOCTL_STEP(handle_termios(fd, cmd, arg, &retval));
run_ioctl:
return __real_ioctl(fd, cmd, arg);
}
static void nullmodem_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
struct nullmodem_end *end = tty->driver_data;
unsigned long flags;
unsigned int cflag;
dprintf("%s - #%d\n", __FUNCTION__, tty->index);
cflag = tty->termios.c_cflag;
/* check that they really want us to change something */
if (old_termios)
{
if (cflag == old_termios->c_cflag
&& RELEVANT_IFLAG(tty->termios.c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))
{
dprintf(" - nothing to change...\n");
return;
}
}
spin_lock_irqsave(&end->pair->spin, flags);
handle_termios(tty);
spin_unlock_irqrestore(&end->pair->spin, flags);
#ifdef SCULL_DEBUG
speed_t speed = tty_get_baud_rate(tty);
dprintf(" - baud = %u", speed);
dprintf(" - ispeed = %u", tty->termios.c_ispeed);
dprintf(" - ospeed = %u", tty->termios.c_ospeed);
/* get the byte size */
switch (cflag & CSIZE)
{
case CS5: dprintf(" - data bits = 5\n"); break;
case CS6: dprintf(" - data bits = 6\n"); break;
case CS7: dprintf(" - data bits = 7\n"); break;
default:
case CS8: dprintf(" - data bits = 8\n"); break;
}
/* determine the parity */
if (cflag & PARENB)
if (cflag & PARODD)
dprintf(" - parity = odd\n");
else
dprintf(" - parity = even\n");
else
dprintf(" - parity = none\n");
/* figure out the stop bits requested */
if (cflag & CSTOPB)
dprintf(" - stop bits = 2\n");
else
dprintf(" - stop bits = 1\n");
/* figure out the hardware flow control settings */
if (cflag & CRTSCTS)
dprintf(" - RTS/CTS is enabled\n");
else
dprintf(" - RTS/CTS is disabled\n");
/* determine software flow control */
/* if we are implementing XON/XOFF, set the start and
* stop character in the device */
/* if we are implementing INBOUND XON/XOFF */
if (I_IXOFF(tty))
dprintf(" - INBOUND XON/XOFF is enabled, "
"XON = %2x, XOFF = %2x\n", START_CHAR(tty), STOP_CHAR(tty));
else
dprintf(" - INBOUND XON/XOFF is disabled\n");
/* if we are implementing OUTBOUND XON/XOFF */
if (I_IXON(tty))
dprintf(" - OUTBOUND XON/XOFF is enabled, "
"XON = %2x, XOFF = %2x\n", START_CHAR(tty), STOP_CHAR(tty));
else
dprintf(" - OUTBOUND XON/XOFF is disabled\n");
#endif
}