ip2main.c

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#ifdef IP2DEBUG_OPEN
	printk(KERN_DEBUG \
			"IP2:open(tty=%p,pFile=%p):dev=%x,maj=%d,min=%d,ch=%d,idx=%d\n",
	       tty, pFile, tty->device, MAJOR(tty->device), MINOR(tty->device),
			 pCh->infl.hd.i2sChannel, pCh->port_index);
	open_sanity_check ( pCh, pCh->pMyBord );
#endif

	i2QueueCommands(PTYPE_INLINE, pCh, 100, 3, CMD_DTRUP,CMD_RTSUP,CMD_DCD_REP);
	pCh->dataSetOut |= (I2_DTR | I2_RTS);
	serviceOutgoingFifo( pCh->pMyBord );

	/* Block here until the port is ready (per serial and istallion) */
	/*
	 * 1. If the port is in the middle of closing wait for the completion
	 *    and then return the appropriate error.
	 */
	init_waitqueue_entry(&wait, current);
	add_wait_queue(&pCh->close_wait, &wait);
	set_current_state( TASK_INTERRUPTIBLE );

	if ( tty_hung_up_p(pFile) || ( pCh->flags & ASYNC_CLOSING )) {
		if ( pCh->flags & ASYNC_CLOSING ) {
			schedule();
		}
		if ( tty_hung_up_p(pFile) ) {
			set_current_state( TASK_RUNNING );
			remove_wait_queue(&pCh->close_wait, &wait);
			return( pCh->flags & ASYNC_HUP_NOTIFY ) ? -EAGAIN : -ERESTARTSYS;
		}
	}
	set_current_state( TASK_RUNNING );
	remove_wait_queue(&pCh->close_wait, &wait);

	/*
	 * 2. If this is a callout device, make sure the normal port is not in
	 *    use, and that someone else doesn't have the callout device locked.
	 *    (These are the only tests the standard serial driver makes for
	 *    callout devices.)
	 */
	if ( tty->driver.subtype == SERIAL_TYPE_CALLOUT ) {
		if ( pCh->flags & ASYNC_NORMAL_ACTIVE ) {
			return -EBUSY;
		}
		if ( ( pCh->flags & ASYNC_CALLOUT_ACTIVE )  &&
		    ( pCh->flags & ASYNC_SESSION_LOCKOUT ) &&
		    ( pCh->session != current->session ) ) {
			return -EBUSY;
		}
		if ( ( pCh->flags & ASYNC_CALLOUT_ACTIVE ) &&
		    ( pCh->flags & ASYNC_PGRP_LOCKOUT )   &&
		    ( pCh->pgrp != current->pgrp ) ) {
			return -EBUSY;
		}
		pCh->flags |= ASYNC_CALLOUT_ACTIVE;
		goto noblock;
	}
	/*
	 * 3. Handle a non-blocking open of a normal port.
	 */
	if ( (pFile->f_flags & O_NONBLOCK) || (tty->flags & (1<<TTY_IO_ERROR) )) {
		if ( pCh->flags & ASYNC_CALLOUT_ACTIVE ) {
			return -EBUSY;
		}
		pCh->flags |= ASYNC_NORMAL_ACTIVE;
		goto noblock;
	}
	/*
	 * 4. Now loop waiting for the port to be free and carrier present
	 *    (if required).
	 */
	if ( pCh->flags & ASYNC_CALLOUT_ACTIVE ) {
		if ( pCh->NormalTermios.c_cflag & CLOCAL ) {
			do_clocal = 1;
		}
	} else {
		if ( tty->termios->c_cflag & CLOCAL ) {
			do_clocal = 1;
		}
	}

#ifdef IP2DEBUG_OPEN
	printk(KERN_DEBUG "OpenBlock: do_clocal = %d\n", do_clocal);
#endif

	++pCh->wopen;

	init_waitqueue_entry(&wait, current);
	add_wait_queue(&pCh->open_wait, &wait);

	for(;;) {
		if ( !(pCh->flags & ASYNC_CALLOUT_ACTIVE)) {
			i2QueueCommands(PTYPE_INLINE, pCh, 100, 2, CMD_DTRUP, CMD_RTSUP);
			pCh->dataSetOut |= (I2_DTR | I2_RTS);
			set_current_state( TASK_INTERRUPTIBLE );
			serviceOutgoingFifo( pCh->pMyBord );
		}
		if ( tty_hung_up_p(pFile) ) {
			set_current_state( TASK_RUNNING );
			remove_wait_queue(&pCh->open_wait, &wait);
			return ( pCh->flags & ASYNC_HUP_NOTIFY ) ? -EBUSY : -ERESTARTSYS;
		}
		if ( !(pCh->flags & ASYNC_CALLOUT_ACTIVE) &&
				!(pCh->flags & ASYNC_CLOSING) && 
				(do_clocal || (pCh->dataSetIn & I2_DCD) )) {
			rc = 0;
			break;
		}

#ifdef IP2DEBUG_OPEN
		printk(KERN_DEBUG "ASYNC_CALLOUT_ACTIVE = %s\n",
			(pCh->flags & ASYNC_CALLOUT_ACTIVE)?"True":"False");
		printk(KERN_DEBUG "ASYNC_CLOSING = %s\n",
			(pCh->flags & ASYNC_CLOSING)?"True":"False");
		printk(KERN_DEBUG "OpenBlock: waiting for CD or signal\n");
#endif
		ip2trace (CHANN, ITRC_OPEN, 3, 2, (pCh->flags & ASYNC_CALLOUT_ACTIVE),
				(pCh->flags & ASYNC_CLOSING) );
		/* check for signal */
		if (signal_pending(current)) {
			rc = (( pCh->flags & ASYNC_HUP_NOTIFY ) ? -EAGAIN : -ERESTARTSYS);
			break;
		}
		schedule();
	}
	set_current_state( TASK_RUNNING );
	remove_wait_queue(&pCh->open_wait, &wait);

	--pCh->wopen; //why count?

	ip2trace (CHANN, ITRC_OPEN, 4, 0 );

	if (rc != 0 ) {
		return rc;
	}
	pCh->flags |= ASYNC_NORMAL_ACTIVE;

noblock:

	/* first open - Assign termios structure to port */
	if ( tty->count == 1 ) {
		i2QueueCommands(PTYPE_INLINE, pCh, 0, 2, CMD_CTSFL_DSAB, CMD_RTSFL_DSAB);
		if ( pCh->flags & ASYNC_SPLIT_TERMIOS ) {
			if ( tty->driver.subtype == SERIAL_TYPE_NORMAL ) {
				*tty->termios = pCh->NormalTermios;
			} else {
				*tty->termios = pCh->CalloutTermios;
			}
		}
		/* Now we must send the termios settings to the loadware */
		set_params( pCh, NULL );
	}

	/* override previous and never reset ??? */
	pCh->session = current->session;
	pCh->pgrp = current->pgrp;

	/*
	 * Now set any i2lib options. These may go away if the i2lib code ends
	 * up rolled into the mainline.
	 */
	pCh->channelOptions |= CO_NBLOCK_WRITE;

#ifdef IP2DEBUG_OPEN
	printk (KERN_DEBUG "IP2: open completed\n" );
#endif
	serviceOutgoingFifo( pCh->pMyBord );

	ip2trace (CHANN, ITRC_OPEN, ITRC_RETURN, 0 );

	return 0;
}

/******************************************************************************/
/* Function:   ip2_close()                                                    */
/* Parameters: Pointer to tty structure                                       */
/*             Pointer to file structure                                      */
/* Returns:    Nothing                                                        */
/*                                                                            */
/* Description:                                                               */
/*                                                                            */
/*                                                                            */
/******************************************************************************/
static void
ip2_close( PTTY tty, struct file *pFile )
{
	i2ChanStrPtr  pCh = tty->driver_data;

	if ( !pCh ) {
		return;
	}

	ip2trace (CHANN, ITRC_CLOSE, ITRC_ENTER, 0 );

#ifdef IP2DEBUG_OPEN
	printk(KERN_DEBUG "IP2:close ttyF%02X:\n",MINOR(tty->device));
#endif

	if ( tty_hung_up_p ( pFile ) ) {
		MOD_DEC_USE_COUNT;

		ip2trace (CHANN, ITRC_CLOSE, 2, 1, 2 );

		return;
	}
	if ( tty->count > 1 ) { /* not the last close */
		MOD_DEC_USE_COUNT;

		ip2trace (CHANN, ITRC_CLOSE, 2, 1, 3 );

		return;
	}
	pCh->flags |= ASYNC_CLOSING;	// last close actually

	/*
	 * Save the termios structure, since this port may have separate termios
	 * for callout and dialin.
	 */
	if (pCh->flags & ASYNC_NORMAL_ACTIVE)
		pCh->NormalTermios = *tty->termios;
	if (pCh->flags & ASYNC_CALLOUT_ACTIVE)
		pCh->CalloutTermios = *tty->termios;

	tty->closing = 1;

	if (pCh->ClosingWaitTime != ASYNC_CLOSING_WAIT_NONE) {
		/*
		 * Before we drop DTR, make sure the transmitter has completely drained.
		 * This uses an timeout, after which the close
		 * completes.
		 */
		ip2_wait_until_sent(tty, pCh->ClosingWaitTime );
	}
	/*
	 * At this point we stop accepting input. Here we flush the channel
	 * input buffer which will allow the board to send up more data. Any
	 * additional input is tossed at interrupt/poll time.
	 */
	i2InputFlush( pCh );

	/* disable DSS reporting */
	i2QueueCommands(PTYPE_INLINE, pCh, 100, 4,
				CMD_DCD_NREP, CMD_CTS_NREP, CMD_DSR_NREP, CMD_RI_NREP);
	if ( !tty || (tty->termios->c_cflag & HUPCL) ) {
		i2QueueCommands(PTYPE_INLINE, pCh, 100, 2, CMD_RTSDN, CMD_DTRDN);
		pCh->dataSetOut &= ~(I2_DTR | I2_RTS);
		i2QueueCommands( PTYPE_INLINE, pCh, 100, 1, CMD_PAUSE(25));
	}

	serviceOutgoingFifo ( pCh->pMyBord );

	if ( tty->driver.flush_buffer ) 
		tty->driver.flush_buffer(tty);
	if ( tty->ldisc.flush_buffer )  
		tty->ldisc.flush_buffer(tty);
	tty->closing = 0;
	
	pCh->pTTY = NULL;

	if (pCh->wopen) {
		if (pCh->ClosingDelay) {
			current->state = TASK_INTERRUPTIBLE;
			schedule_timeout(pCh->ClosingDelay);
		}
		wake_up_interruptible(&pCh->open_wait);
	}

	pCh->flags &=~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|ASYNC_CLOSING);
	wake_up_interruptible(&pCh->close_wait);

#ifdef IP2DEBUG_OPEN
	DBG_CNT("ip2_close: after wakeups--");
#endif

	MOD_DEC_USE_COUNT;

	ip2trace (CHANN, ITRC_CLOSE, ITRC_RETURN, 1, 1 );

	return;
}

/******************************************************************************/
/* Function:   ip2_hangup()                                                   */
/* Parameters: Pointer to tty structure                                       */
/* Returns:    Nothing                                                        */
/*                                                                            */
/* Description:                                                               */
/*                                                                            */
/*                                                                            */
/******************************************************************************/
static void
ip2_hangup ( PTTY tty )
{
	i2ChanStrPtr  pCh = tty->driver_data;

	if( !pCh ) {
		return;
	}

	ip2trace (CHANN, ITRC_HANGUP, ITRC_ENTER, 0 );

	ip2_flush_buffer(tty);

	/* disable DSS reporting */

	i2QueueCommands(PTYPE_BYPASS, pCh, 0, 1, CMD_DCD_NREP);
	i2QueueCommands(PTYPE_INLINE, pCh, 0, 2, CMD_CTSFL_DSAB, CMD_RTSFL_DSAB);
	if ( (tty->termios->c_cflag & HUPCL) ) {
		i2QueueCommands(PTYPE_BYPASS, pCh, 0, 2, CMD_RTSDN, CMD_DTRDN);
		pCh->dataSetOut &= ~(I2_DTR | I2_RTS);
		i2QueueCommands( PTYPE_INLINE, pCh, 100, 1, CMD_PAUSE(25));
	}
	i2QueueCommands(PTYPE_INLINE, pCh, 1, 3, 
				CMD_CTS_NREP, CMD_DSR_NREP, CMD_RI_NREP);
	serviceOutgoingFifo ( pCh->pMyBord );

	wake_up_interruptible ( &pCh->delta_msr_wait );

	pCh->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
	pCh->pTTY = NULL;
	wake_up_interruptible ( &pCh->open_wait );

	ip2trace (CHANN, ITRC_HANGUP, ITRC_RETURN, 0 );
}

/******************************************************************************/
/******************************************************************************/
/* Device Output Section                                                      */
/******************************************************************************/
/******************************************************************************/

/******************************************************************************/
/* Function:   ip2_write()                                                    */
/* Parameters: Pointer to tty structure                                       */
/*             Flag denoting data is in user (1) or kernel (0) space          */
/*             Pointer to data                                                */
/*             Number of bytes to write                                       */
/* Returns:    Number of bytes actually written                               */
/*                                                                            */
/* Description: (MANDATORY)                                                   */
/*                                                                            */
/*                                                                            */
/******************************************************************************/
static int
ip2_write( PTTY tty, int user, const unsigned char *pData, int count)
{
	i2ChanStrPtr  pCh = tty->driver_data;
	int bytesSent = 0;
	unsigned long flags;

	ip2trace (CHANN, ITRC_WRITE, ITRC_ENTER, 2, count, -1 );

	/* Flush out any buffered data left over from ip2_putchar() calls. */
	ip2_flush_chars( tty );

	/* This is the actual move bit. Make sure it does what we need!!!!! */
	WRITE_LOCK_IRQSAVE(&pCh->Pbuf_spinlock,flags);
	bytesSent = i2Output( pCh, pData, count, user );
	WRITE_UNLOCK_IRQRESTORE(&pCh->Pbuf_spinlock,flags);

	ip2trace (CHANN, ITRC_WRITE, ITRC_RETURN, 1, bytesSent );

	return bytesSent > 0 ? bytesSent : 0;
}

/******************************************************************************/
/* Function:   ip2_putchar()                                                  */
/* Parameters: Pointer to tty structure                                       */
/*             Character to write                                             */
/* Returns:    Nothing                                                        */
/*                                                                            */
/* Description:                                                               */
/*                                                                            */
/*                                                                            */
/******************************************************************************/
static void
ip2_putchar( PTTY tty, unsigned char ch )
{
	i2ChanStrPtr  pCh = tty->driver_data;
	unsigned long flags;

//	ip2trace (CHANN, ITRC_PUTC, ITRC_ENTER, 1, ch );

	WRITE_LOCK_IRQSAVE(&pCh->Pbuf_spinlock,flags);
	pCh->Pbuf[pCh->Pbuf_stuff++] = ch;
	if ( pCh->Pbuf_stuff == sizeof pCh->Pbuf ) {
		WRITE_UNLOCK_IRQRESTORE(&pCh->Pbuf_spinlock,flags);
		ip2_flush_chars( tty );
	} else
		WRITE_UNLOCK_IRQRESTORE(&pCh->Pbuf_spinlock,flags);

//	ip2trace (CHANN, ITRC_PUTC, ITRC_RETURN, 1, ch );
}

/******************************************************************************/
/* Function:   ip2_flush_chars()                                              */
/* Parameters: Pointer to tty str