void gs_close(struct tty_struct * tty, struct file * filp)
{
unsigned long flags;
struct gs_port *port;
func_enter ();
if (!tty) return;
port = (struct gs_port *) tty->driver_data;
if (!port) return;
if (!port->tty) {
/* This seems to happen when this is called from vhangup. */
gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->tty is NULL\n");
port->tty = tty;
}
spin_lock_irqsave(&port->driver_lock, flags);
if (tty_hung_up_p(filp)) {
spin_unlock_irqrestore(&port->driver_lock, flags);
if (port->rd->hungup)
port->rd->hungup (port);
func_exit ();
return;
}
if ((tty->count == 1) && (port->count != 1)) {
printk(KERN_ERR "gs: gs_close port %p: bad port count;"
" tty->count is 1, port count is %d\n", port, port->count);
port->count = 1;
}
if (--port->count < 0) {
printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->count);
port->count = 0;
}
if (port->count) {
gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->count);
spin_unlock_irqrestore(&port->driver_lock, flags);
func_exit ();
return;
}
port->flags |= ASYNC_CLOSING;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
/* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, port->closing_wait); */
/*
* At this point we stop accepting input. To do this, we
* disable the receive line status interrupts, and tell the
* interrupt driver to stop checking the data ready bit in the
* line status register.
*/
port->rd->disable_rx_interrupts (port);
spin_unlock_irqrestore(&port->driver_lock, flags);
/* close has no way of returning "EINTR", so discard return value */
if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
gs_wait_tx_flushed (port, port->closing_wait);
port->flags &= ~GS_ACTIVE;
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
tty->closing = 0;
port->event = 0;
port->rd->close (port);
port->rd->shutdown_port (port);
port->tty = NULL;
if (port->blocked_open) {
if (port->close_delay) {
spin_unlock_irqrestore(&port->driver_lock, flags);
msleep_interruptible(jiffies_to_msecs(port->close_delay));
spin_lock_irqsave(&port->driver_lock, flags);
}
wake_up_interruptible(&port->open_wait);
}
port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED);
wake_up_interruptible(&port->close_wait);
func_exit ();
}
void gs_set_termios (struct tty_struct * tty,
struct ktermios * old_termios)
{
struct gs_port *port;
int baudrate, tmp, rv;
struct ktermios *tiosp;
func_enter();
if (!tty) return;
port = tty->driver_data;
if (!port) return;
if (!port->tty) {
/* This seems to happen when this is called after gs_close. */
gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->tty is NULL\n");
port->tty = tty;
}
tiosp = tty->termios;
if (gs_debug & GS_DEBUG_TERMIOS) {
gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp);
}
/* This is an optimization that is only allowed for dumb cards */
/* Smart cards require knowledge of iflags and oflags too: that
might change hardware cooking mode.... */
if (old_termios) {
if( (tiosp->c_iflag == old_termios->c_iflag)
&& (tiosp->c_oflag == old_termios->c_oflag)
&& (tiosp->c_cflag == old_termios->c_cflag)
&& (tiosp->c_lflag == old_termios->c_lflag)
&& (tiosp->c_line == old_termios->c_line)
&& (memcmp(tiosp->c_cc, old_termios->c_cc, NCC) == 0)) {
gs_dprintk(GS_DEBUG_TERMIOS, "gs_set_termios: optimized away\n");
return /* 0 */;
}
} else
gs_dprintk(GS_DEBUG_TERMIOS, "gs_set_termios: no old_termios: "
"no optimization\n");
if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) {
if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n");
if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n");
if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n");
if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n");
if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n");
if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n");
}
baudrate = tty_get_baud_rate(tty);
if ((tiosp->c_cflag & CBAUD) == B38400) {
if ( (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
baudrate = 57600;
else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
baudrate = 115200;
else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
baudrate = 230400;
else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
baudrate = 460800;
else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
baudrate = (port->baud_base / port->custom_divisor);
}
/* I recommend using THIS instead of the mess in termios (and
duplicating the above code). Next we should create a clean
interface towards this variable. If your card supports arbitrary
baud rates, (e.g. CD1400 or 16550 based cards) then everything
will be very easy..... */
port->baud = baudrate;
/* Two timer ticks seems enough to wakeup something like SLIP driver */
/* Baudrate/10 is cps. Divide by HZ to get chars per tick. */
tmp = (baudrate / 10 / HZ) * 2;
if (tmp < 0) tmp = 0;
if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1;
port->wakeup_chars = tmp;
/* We should really wait for the characters to be all sent before
changing the settings. -- CAL */
rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT);
if (rv < 0) return /* rv */;
rv = port->rd->set_real_termios(port);
if (rv < 0) return /* rv */;
if ((!old_termios ||
(old_termios->c_cflag & CRTSCTS)) &&
!( tiosp->c_cflag & CRTSCTS)) {
tty->stopped = 0;
gs_start(tty);
}
#ifdef tytso_patch_94Nov25_1726
/* This "makes sense", Why is it commented out? */
if (!(old_termios->c_cflag & CLOCAL) &&
(tty->termios->c_cflag & CLOCAL))
wake_up_interruptible(&port->gs.open_wait);
#endif
func_exit();
return /* 0 */;
}
void gs_close(struct tty_struct * tty, struct file * filp)
{
unsigned long flags;
struct gs_port *port;
func_enter ();
if (!tty) return;
port = (struct gs_port *) tty->driver_data;
if (!port) return;
if (!port->tty) {
/* This seems to happen when this is called from vhangup. */
gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->tty is NULL\n");
port->tty = tty;
}
save_flags(flags); cli();
if (tty_hung_up_p(filp)) {
restore_flags(flags);
port->rd->hungup (port);
func_exit ();
return;
}
if ((tty->count == 1) && (port->count != 1)) {
printk(KERN_ERR "gs: gs_close: bad port count;"
" tty->count is 1, port count is %d\n", port->count);
port->count = 1;
}
if (--port->count < 0) {
printk(KERN_ERR "gs: gs_close: bad port count: %d\n", port->count);
port->count = 0;
}
if (port->count) {
gs_dprintk(GS_DEBUG_CLOSE, "gs_close: count: %d\n", port->count);
restore_flags(flags);
func_exit ();
return;
}
port->flags |= ASYNC_CLOSING;
/*
* Save the termios structure, since this port may have
* separate termios for callout and dialin.
*/
if (port->flags & ASYNC_NORMAL_ACTIVE)
port->normal_termios = *tty->termios;
if (port->flags & ASYNC_CALLOUT_ACTIVE)
port->callout_termios = *tty->termios;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
/* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, port->closing_wait); */
/*
* At this point we stop accepting input. To do this, we
* disable the receive line status interrupts, and tell the
* interrupt driver to stop checking the data ready bit in the
* line status register.
*/
port->rd->disable_rx_interrupts (port);
/* close has no way of returning "EINTR", so discard return value */
if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
gs_wait_tx_flushed (port, port->closing_wait);
port->flags &= ~GS_ACTIVE;
if (tty->driver.flush_buffer)
tty->driver.flush_buffer(tty);
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
tty->closing = 0;
port->event = 0;
port->rd->close (port);
port->rd->shutdown_port (port);
port->tty = 0;
if (port->blocked_open) {
if (port->close_delay) {
set_current_state (TASK_INTERRUPTIBLE);
schedule_timeout(port->close_delay);
}
wake_up_interruptible(&port->open_wait);
}
port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
ASYNC_CLOSING | ASYNC_INITIALIZED);
wake_up_interruptible(&port->close_wait);
restore_flags(flags);
func_exit ();
}
