/* n_hdlc_tty_open
*
* called when line discipline changed to n_hdlc
*
* Arguments: tty pointer to tty info structure
* Return Value: 0 if success, otherwise error code
*/
static int n_hdlc_tty_open (struct tty_struct *tty)
{
struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
if (debuglevel >= DEBUG_LEVEL_INFO)
printk("%s(%d)n_hdlc_tty_open() called (major=%u,minor=%u)\n",
__FILE__,__LINE__,
MAJOR(tty->device), MINOR(tty->device));
/* There should not be an existing table for this slot. */
if (n_hdlc) {
printk (KERN_ERR"n_hdlc_tty_open:tty already associated!\n" );
return -EEXIST;
}
n_hdlc = n_hdlc_alloc();
if (!n_hdlc) {
printk (KERN_ERR "n_hdlc_alloc failed\n");
return -ENFILE;
}
tty->disc_data = n_hdlc;
n_hdlc->tty = tty;
MOD_INC_USE_COUNT;
#if defined(TTY_NO_WRITE_SPLIT)
/* change tty_io write() to not split large writes into 8K chunks */
set_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
#endif
/* Flush any pending characters in the driver and discipline. */
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer (tty);
if (tty->driver.flush_buffer)
tty->driver.flush_buffer (tty);
if (debuglevel >= DEBUG_LEVEL_INFO)
printk("%s(%d)n_hdlc_tty_open() success\n",__FILE__,__LINE__);
return 0;
} /* end of n_tty_hdlc_open() */
/**
* n_hdlc_tty_open - called when line discipline changed to n_hdlc
* @tty - pointer to tty info structure
*
* Returns 0 if success, otherwise error code
*/
static int n_hdlc_tty_open (struct tty_struct *tty)
{
struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
if (debuglevel >= DEBUG_LEVEL_INFO)
printk("%s(%d)n_hdlc_tty_open() called (device=%s)\n",
__FILE__,__LINE__,
tty->name);
/* There should not be an existing table for this slot. */
if (n_hdlc) {
printk (KERN_ERR"n_hdlc_tty_open:tty already associated!\n" );
return -EEXIST;
}
n_hdlc = n_hdlc_alloc();
if (!n_hdlc) {
printk (KERN_ERR "n_hdlc_alloc failed\n");
return -ENFILE;
}
tty->disc_data = n_hdlc;
n_hdlc->tty = tty;
tty->receive_room = 65536;
#if defined(TTY_NO_WRITE_SPLIT)
/* change tty_io write() to not split large writes into 8K chunks */
set_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
#endif
/* flush receive data from driver */
tty_driver_flush_buffer(tty);
if (debuglevel >= DEBUG_LEVEL_INFO)
printk("%s(%d)n_hdlc_tty_open() success\n",__FILE__,__LINE__);
return 0;
} /* end of n_tty_hdlc_open() */
static int n_hdlc_tty_open (struct tty_struct *tty)
{
struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
if (debuglevel >= DEBUG_LEVEL_INFO)
printk("%s(%d)n_hdlc_tty_open() called (device=%s)\n",
__FILE__,__LINE__,
tty->name);
if (n_hdlc) {
printk (KERN_ERR"n_hdlc_tty_open:tty already associated!\n" );
return -EEXIST;
}
n_hdlc = n_hdlc_alloc();
if (!n_hdlc) {
printk (KERN_ERR "n_hdlc_alloc failed\n");
return -ENFILE;
}
tty->disc_data = n_hdlc;
n_hdlc->tty = tty;
tty->receive_room = 65536;
#if defined(TTY_NO_WRITE_SPLIT)
set_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
#endif
tty_driver_flush_buffer(tty);
if (debuglevel >= DEBUG_LEVEL_INFO)
printk("%s(%d)n_hdlc_tty_open() success\n",__FILE__,__LINE__);
return 0;
}
static int vl_sync_request_port(struct vl_sync_port *port)
{
struct n_hdlc *n_hdlc;
unsigned long flags;
int ret;
pr_debug("VL_SYNC[%d]:request port\n", port->line);
spin_lock_irqsave(&port->ctrl_lock,flags);
if (IS_OPEN(port)) {
pr_err("VL_SYNC[%d]:request port: busy", port->line);
ret = -EBUSY;
goto err_exit;
}
/* Initialize rx/tx frame queues */
n_hdlc = n_hdlc_alloc();
if (!n_hdlc) {
pr_err("VL_SYNC[%d]:n_hdlc_alloc failed\n", port->line);
ret = -ENFILE;
goto err_exit;
}
port->n_hdlc = n_hdlc;
/* Set transmit clock parameters */
vl_sync_set_iface(port, &port->atc_config);
port->flags |= FLAG_OPEN;
port->pid = current->pid;
spin_unlock_irqrestore(&port->ctrl_lock, flags);
return 0;
err_exit:
spin_unlock_irqrestore(&port->ctrl_lock, flags);
return ret;
}
