/*
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
 *	Original driver code supplied by Multi-Tech
 *
 *	Changes
 *	1/9/98	alan@redhat.com		Merge to 2.0.x kernel tree
 *					Obtain and use official major/minors
 *					Loader switched to a misc device
 *					(fixed range check bug as a side effect)
 *					Printk clean up
 *	9/12/98	alan@redhat.com		Rough port to 2.1.x
 *
 *	10/6/99 sameer			Merged the ISA and PCI drivers to
 *					a new unified driver.
 *	09/06/01 acme@conectiva.com.br	use capable, not suser, do
 *					restore_flags on failure in
 *					isicom_send_break, verify put_user
 *					result
 *	***********************************************************
 *
 *	To use this driver you also need the support package. You 
 *	can find this in RPM format on
 *		ftp://ftp.linux.org.uk/pub/linux/alan
 * 	
 *	You can find the original tools for this direct from Multitech
 *		ftp://ftp.multitech.com/ISI-Cards/
 *
 *	Having installed the cards the module options (/etc/modprobe.conf)
 *
 *	options isicom   io=card1,card2,card3,card4 irq=card1,card2,card3,card4
 *
 *	Omit those entries for boards you don't have installed.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/termios.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/serial.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/ioport.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/system.h>

#include <linux/pci.h>

#include <linux/isicom.h>

static struct pci_device_id isicom_pci_tbl[] = {
	{ VENDOR_ID, 0x2028, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ VENDOR_ID, 0x2051, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ VENDOR_ID, 0x2052, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ VENDOR_ID, 0x2053, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ VENDOR_ID, 0x2054, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ VENDOR_ID, 0x2055, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ VENDOR_ID, 0x2056, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ VENDOR_ID, 0x2057, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ VENDOR_ID, 0x2058, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, isicom_pci_tbl);

static int prev_card = 3;	/*	start servicing isi_card[0]	*/
static struct isi_board * irq_to_board[16];
static struct tty_driver *isicom_normal;

static struct isi_board isi_card[BOARD_COUNT];
static struct isi_port  isi_ports[PORT_COUNT];

static struct timer_list tx;
static char re_schedule = 1;
#ifdef ISICOM_DEBUG
static unsigned long tx_count = 0;
#endif

static int ISILoad_ioctl(struct inode *inode, struct file *filp, unsigned  int cmd, unsigned long arg);

static void isicom_tx(unsigned long _data);
static void isicom_start(struct tty_struct * tty);

static unsigned char * tmp_buf = 0;
static DECLARE_MUTEX(tmp_buf_sem);

/*   baud index mappings from linux defns to isi */

static signed char linuxb_to_isib[] = {
	-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17,     
	18, 19
};

/* 
 *  Firmware loader driver specific routines
 *
 */

static struct file_operations ISILoad_fops = {
	.owner		= THIS_MODULE,
	.ioctl		= ISILoad_ioctl,
};

struct miscdevice isiloader_device = {
	ISILOAD_MISC_MINOR, "isictl", &ISILoad_fops
};

 
static inline int WaitTillCardIsFree(unsigned short base)
{
	unsigned long count=0;
	while( (!(inw(base+0xe) & 0x1)) && (count++ < 6000000));
	if (inw(base+0xe)&0x1)  
		return 0;
	else
		return 1;
}

static int ISILoad_ioctl(struct inode *inode, struct file *filp,
		         unsigned int cmd, unsigned long arg)
{
	unsigned int card, i, j, signature, status, portcount = 0;
	unsigned short word_count, base;
	bin_frame frame;
	/* exec_record exec_rec; */
	
	if(get_user(card, (int *)arg))
		return -EFAULT;
		
	if(card < 0 || card >= BOARD_COUNT)
		return -ENXIO;
		
	base=isi_card[card].base;
	
	if(base==0)
		return -ENXIO;	/* disabled or not used */
	
	switch(cmd) {
		case MIOCTL_RESET_CARD:
			if (!capable(CAP_SYS_ADMIN))
				return -EPERM;
			printk(KERN_DEBUG "ISILoad:Resetting Card%d at 0x%x ",card+1,base);
								
			inw(base+0x8);
			
			for(i=jiffies+HZ/100;time_before(jiffies, i););
				
			outw(0,base+0x8); /* Reset */
			
			for(j=1;j<=3;j++) {
				for(i=jiffies+HZ;time_before(jiffies, i););
				printk(".");
			}	
			signature=(inw(base+0x4)) & 0xff;	
			if (isi_card[card].isa) {
					
				if (!(inw(base+0xe) & 0x1) || (inw(base+0x2))) {
#ifdef ISICOM_DEBUG				
					printk("\nbase+0x2=0x%x , base+0xe=0x%x",inw(base+0x2),inw(base+0xe));
#endif				
					printk("\nISILoad:ISA Card%d reset failure (Possible bad I/O Port Address 0x%x).\n",card+1,base);
					return -EIO;					
				}
			}	
			else {
				portcount = inw(base+0x2);
				if (!(inw(base+0xe) & 0x1) || ((portcount!=0) && (portcount!=4) && (portcount!=8))) {	
#ifdef ISICOM_DEBUG
					printk("\nbase+0x2=0x%x , base+0xe=0x%x",inw(base+0x2),inw(base+0xe));
#endif
					printk("\nISILoad:PCI Card%d reset failure (Possible bad I/O Port Address 0x%x).\n",card+1,base);
					return -EIO;
				}
			}	
			switch(signature) {
			case	0xa5:
			case	0xbb:
			case	0xdd:	
					if (isi_card[card].isa) 
						isi_card[card].port_count = 8;
					else {
						if (portcount == 4)
							isi_card[card].port_count = 4;
						else
							isi_card[card].port_count = 8;
					}	
				     	isi_card[card].shift_count = 12;
				     	break;
				        
			case	0xcc:	isi_card[card].port_count = 16;
					isi_card[card].shift_count = 11;
					break;  			
					
			default: printk("ISILoad:Card%d reset failure (Possible bad I/O Port Address 0x%x).\n",card+1,base);
#ifdef ISICOM_DEBUG			
				 printk("Sig=0x%x\n",signature);
#endif				 
				 return -EIO;
			}
			printk("-Done\n");
			return put_user(signature,(unsigned int*)arg);
						
	case	MIOCTL_LOAD_FIRMWARE:
			if (!capable(CAP_SYS_ADMIN))
				return -EPERM;
				
			if(copy_from_user(&frame, (void *) arg, sizeof(bin_frame)))
				return -EFAULT;
			
			if (WaitTillCardIsFree(base))
				return -EIO;
			
			outw(0xf0,base);	/* start upload sequence */ 
			outw(0x00,base);
			outw((frame.addr), base);/*      lsb of adderess    */
			
			word_count=(frame.count >> 1) + frame.count % 2;
			outw(word_count, base);
			InterruptTheCard(base);
			
			for(i=0;i<=0x2f;i++);	/* a wee bit of delay */
			
			if (WaitTillCardIsFree(base)) 
				return -EIO;
				
			if ((status=inw(base+0x4))!=0) {
				printk(KERN_WARNING "ISILoad:Card%d rejected load header:\nAddress:0x%x \nCount:0x%x \nStatus:0x%x \n", 
				card+1, frame.addr, frame.count, status);
				return -EIO;
			}
			outsw(base, (void *) frame.bin_data, word_count);
			
			InterruptTheCard(base);
			
			for(i=0;i<=0x0f;i++);	/* another wee bit of delay */ 
			
			if (WaitTillCardIsFree(base)) 
				return -EIO;
				
			if ((status=inw(base+0x4))!=0) {
				printk(KERN_ERR "ISILoad:Card%d got out of sync.Card Status:0x%x\n",card+1, status);
				return -EIO;
			}	
			return 0;
						
	case	MIOCTL_READ_FIRMWARE:
			if (!capable(CAP_SYS_ADMIN))
				return -EPERM;
				
			if(copy_from_user(&frame, (void *) arg, sizeof(bin_header)))
				return -EFAULT;
			
			if (WaitTillCardIsFree(base))
				return -EIO;
			
			outw(0xf1,base);	/* start download sequence */ 
			outw(0x00,base);
			outw((frame.addr), base);/*      lsb of adderess    */
			
			word_count=(frame.count >> 1) + frame.count % 2;
			outw(word_count+1, base);
			InterruptTheCard(base);
			
			for(i=0;i<=0xf;i++);	/* a wee bit of delay */
			
			if (WaitTillCardIsFree(base)) 
				return -EIO;
				
			if ((status=inw(base+0x4))!=0) {
				printk(KERN_WARNING "ISILoad:Card%d rejected verify header:\nAddress:0x%x \nCount:0x%x \nStatus:0x%x \n", 
				card+1, frame.addr, frame.count, status);
				return -EIO;
			}
			
			inw(base);
			insw(base, frame.bin_data, word_count);
			InterruptTheCard(base);
			
			for(i=0;i<=0x0f;i++);	/* another wee bit of delay */ 
			
			if (WaitTillCardIsFree(base)) 
				return -EIO;
				
			if ((status=inw(base+0x4))!=0) {
				printk(KERN_ERR "ISILoad:Card%d verify got out of sync.Card Status:0x%x\n",card+1, status);
				return -EIO;
			}	
			
			if(copy_to_user((void *) arg, &frame, sizeof(bin_frame)))
				return -EFAULT;
			return 0;
	
	case	MIOCTL_XFER_CTRL:
			if (!capable(CAP_SYS_ADMIN))
				return -EPERM;
			if (WaitTillCardIsFree(base)) 
				return -EIO;
					
			outw(0xf2, base);
			outw(0x800, base);
			outw(0x0, base);
			outw(0x0, base);
			InterruptTheCard(base);
			outw(0x0, base+0x4);    /* for ISI4608 cards */
							
			isi_card[card].status |= FIRMWARE_LOADED;
			return 0;	
			
	default:
#ifdef ISICOM_DEBUG	
		printk(KERN_DEBUG "ISILoad: Received Ioctl cmd 0x%x.\n", cmd); 
#endif
		return -ENOIOCTLCMD;
	
	}
	
}
		        	

/*
 *	ISICOM Driver specific routines ...
 *
 */
 
static inline int isicom_paranoia_check(struct isi_port const * port, char *name, 
					const char * routine)
{
#ifdef ISICOM_DEBUG 
	static const char * badmagic = 
			KERN_WARNING "ISICOM: Warning: bad isicom magic for dev %s in %s.\n";
	static const char * badport = 
			KERN_WARNING "ISICOM: Warning: NULL isicom port for dev %s in %s.\n";		
	if (!port) {
		printk(badport, name, routine);
		return 1;
	}
	if (port->magic != ISICOM_MAGIC) {
		printk(badmagic, name, routine);
		return 1;
	}	
#endif	
	return 0;
}
			
/*	Transmitter	*/

static void isicom_tx(unsigned long _data)
{
	short count = (BOARD_COUNT-1), card, base;
	short txcount, wait, wrd, residue, word_count, cnt;
	struct isi_port * port;
	struct tty_struct * tty;
	unsigned long flags;
	
#ifdef ISICOM_DEBUG
	++tx_count;
#endif	
	
	/*	find next active board	*/
	card = (prev_card + 1) & 0x0003;
	while(count-- > 0) {
		if (isi_card[card].status & BOARD_ACTIVE) 
			break;
		card = (card + 1) & 0x0003;	
	}
	if (!(isi_card[card].status & BOARD_ACTIVE))
		goto sched_again;
		
	prev_card = card;
	
	count = isi_card[card].port_count;
	port = isi_card[card].ports;
	base = isi_card[card].base;
	for (;count > 0;count--, port++) {
		/* port not active or tx disabled to force flow control */
		if (!(port->status & ISI_TXOK))
			continue;
		
		tty = port->tty;
		save_flags(flags); cli();
		txcount = MIN(TX_SIZE, port->xmit_cnt);
		if ((txcount <= 0) || tty->stopped || tty->hw_stopped) {
			restore_flags(flags);
			continue;
		}
		wait = 200;	
		while(((inw(base+0x0e) & 0x01) == 0) && (wait-- > 0));
		if (wait <= 0) {
			restore_flags(flags);
#ifdef ISICOM_DEBUG
			printk(KERN_DEBUG "ISICOM: isicom_tx:Card(0x%x) found busy.\n",
				card);
#endif
			continue;
		}
		if (!(inw(base + 0x02) & (1 << port->channel))) {
			restore_flags(flags);
#ifdef ISICOM_DEBUG					
			printk(KERN_DEBUG "ISICOM: isicom_tx: cannot tx to 0x%x:%d.\n",
					base, port->channel + 1);
#endif					
			continue;		
		}
#ifdef ISICOM_DEBUG
		printk(KERN_DEBUG "ISICOM: txing %d bytes, port%d.\n", 
				txcount, port->channel+1); 
#endif	
		outw((port->channel << isi_card[card].shift_count) | txcount
					, base);
		residue = NO;
		wrd = 0;			
		while (1) {
			cnt = MIN(txcount, (SERIAL_XMIT_SIZE - port->xmit_tail));
			if (residue == YES) {
				residue = NO;
				if (cnt > 0) {
					wrd |= (port->xmit_buf[port->xmit_tail] << 8);
					port->xmit_tail = (port->xmit_tail + 1) & (SERIAL_XMIT_SIZE - 1);
					port->xmit_cnt--;
					txcount--;
					cnt--;
					outw(wrd, base);			
				}
				else {
					outw(wrd, base);
					break;
				}
			}		
			if (cnt <= 0) break;
			word_count = cnt >> 1;
			outsw(base, port->xmit_buf+port->xmit_tail, word_count);
			port->xmit_tail = (port->xmit_tail + (word_count << 1)) &
						(SERIAL_XMIT_SIZE - 1);
			txcount -= (word_count << 1);
			port->xmit_cnt -= (word_count << 1);
			if (cnt & 0x0001) {
				residue = YES;
				wrd = port->xmit_buf[port->xmit_tail];
				port->xmit_tail = (port->xmit_tail + 1) & (SERIAL_XMIT_SIZE - 1);
				port->xmit_cnt--;
				txcount--;
			}
		}

		InterruptTheCard(base);
		if (port->xmit_cnt <= 0)
			port->status &= ~ISI_TXOK;
		if (port->xmit_cnt <= WAKEUP_CHARS)
			schedule_work(&port->bh_tqueue);
		restore_flags(flags);
	}	

		/*	schedule another tx for hopefully in about 10ms	*/	
sched_again:	
	if (!re_schedule)	
		return;
	init_timer(&tx);
	tx.expires = jiffies + HZ/100;
	tx.data = 0;
	tx.function = isicom_tx;
	add_timer(&tx);
	
	return;	
}		
 
/* 	Interrupt handlers 	*/

 
static void isicom_bottomhalf(void * data)
{
	struct isi_port * port = (struct isi_port *) data;
	struct tty_struct * tty = port->tty;
	
	if (!tty)
		return;
	
	if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
	    tty->ldisc.write_wakeup)
		(tty->ldisc.write_wakeup)(tty);
	wake_up_interruptible(&tty->write_wait);
} 		
 		
/* main interrupt handler routine */ 		
static irqreturn_t isicom_interrupt(int irq, void *dev_id,
					struct pt_regs *regs)
{
	struct isi_board * card;
	struct isi_port * port;
	struct tty_struct * tty;
	unsigned short base, header, word_count, count;
	unsigned char channel;
	short byte_count;
	
	/*
	 *      find the source of interrupt
	 */
	 
	for(count = 0; count < BOARD_COUNT; count++) { 
		card = &isi_card[count];
		if (card->base != 0) {
			if (((card->isa == YES) && (card->irq == irq)) || 
				((card->isa == NO) && (card->irq == irq) && (inw(card->base+0x0e) & 0x02)))
				break;
		}
		card = NULL;
	}

	if (!card || !(card->status & FIRMWARE_LOADED)) {
/*		printk(KERN_DEBUG "ISICOM: interrupt: not handling irq%d!.\n", irq);*/
		return IRQ_NONE;
	}
	
	base = card->base;
	if (card->isa == NO) {
	/*
	 *      disable any interrupts from the PCI card and lower the
	 *      interrupt line
	 */
		outw(0x8000, base+0x04);
		ClearInterrupt(base);
	}
	
	inw(base);		/* get the dummy word out */
	header = inw(base);
	channel = (header & 0x7800) >> card->shift_count;
	byte_count = header & 0xff;
#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "ISICOM:Intr:(0x%x:%d).\n", base, channel+1);
#endif	
	if ((channel+1) > card->port_count) {
		printk(KERN_WARNING "ISICOM: isicom_interrupt(0x%x): %d(channel) > port_count.\n",
				base, channel+1);
		if (card->isa)
			ClearInterrupt(base);
		else
			outw(0x0000, base+0x04); /* enable interrupts */		
		return IRQ_HANDLED;			
	}
	port = card->ports + channel;
	if (!(port->flags & ASYNC_INITIALIZED)) {
		if (card->isa)
			ClearInterrupt(base);
		else
			outw(0x0000, base+0x04); /* enable interrupts */
		return IRQ_HANDLED;
	}	
		
	tty = port->tty;
	
	if (header & 0x8000) {		/* Status Packet */
		header = inw(base);
		switch(header & 0xff) {
			case 0:	/* Change in EIA signals */
				
				if (port->flags & ASYNC_CHECK_CD) {
					if (port->status & ISI_DCD) {
						if (!(header & ISI_DCD)) {
						/* Carrier has been lost  */
#ifdef ISICOM_DEBUG						
							printk(KERN_DEBUG "ISICOM: interrupt: DCD->low.\n");
#endif							
							port->status &= ~ISI_DCD;
							schedule_work(&port->hangup_tq);
						}
					}
					else {
						if (header & ISI_DCD) {
						/* Carrier has been detected */
#ifdef ISICOM_DEBUG
							printk(KERN_DEBUG "ISICOM: interrupt: DCD->high.\n");
#endif							
							port->status |= ISI_DCD;
							wake_up_interruptible(&port->open_wait);
						}
					}
				}
				else {
					if (header & ISI_DCD) 
						port->status |= ISI_DCD;
					else
						port->status &= ~ISI_DCD;
				}	
				
				if (port->flags & ASYNC_CTS_FLOW) {
					if (port->tty->hw_stopped) {
						if (header & ISI_CTS) {
							port->tty->hw_stopped = 0;
							/* start tx ing */
							port->status |= (ISI_TXOK | ISI_CTS);
							schedule_work(&port->bh_tqueue);
						}
					}
					else {
						if (!(header & ISI_CTS)) {
							port->tty->hw_stopped = 1;
							/* stop tx ing */
							port->status &= ~(ISI_TXOK | ISI_CTS);
						}
					}
				}
				else {
					if (header & ISI_CTS) 
						port->status |= ISI_CTS;
					else
						port->status &= ~ISI_CTS;
				}
				
				if (header & ISI_DSR) 
					port->status |= ISI_DSR;
				else
					port->status &= ~ISI_DSR;
				
				if (header & ISI_RI) 
					port->status |= ISI_RI;
				else
					port->status &= ~ISI_RI;						
				
				break;
				
			case 1:	/* Received Break !!!	 */
				if (tty->flip.count >= TTY_FLIPBUF_SIZE)
					break;
				*tty->flip.flag_buf_ptr++ = TTY_BREAK;
				/* dunno if this is right */	
				*tty->flip.char_buf_ptr++ = 0;
				tty->flip.count++;
				if (port->flags & ASYNC_SAK)
					do_SAK(tty);
				schedule_delayed_work(&tty->flip.work, 1);
				break;
				
			case 2:	/* Statistics		 */
				printk(KERN_DEBUG "ISICOM: isicom_interrupt: stats!!!.\n");			
				break;
				
			default:
				printk(KERN_WARNING "ISICOM: Intr: Unknown code in status packet.\n");
				break;
		}	 
	}
	else {				/* Data   Packet */
		count = MIN(byte_count, (TTY_FLIPBUF_SIZE - tty->flip.count));
#ifdef ISICOM_DEBUG
		printk(KERN_DEBUG "ISICOM: Intr: Can rx %d of %d bytes.\n", 
					count, byte_count);
#endif			
		word_count = count >> 1;
		insw(base, tty->flip.char_buf_ptr, word_count);
		tty->flip.char_buf_ptr += (word_count << 1);		
		byte_count -= (word_count << 1);
		if (count & 0x0001) {
			*tty->flip.char_buf_ptr++ = (char)(inw(base) & 0xff);
			byte_count -= 2;
		}	
		memset(tty->flip.flag_buf_ptr, 0, count);
		tty->flip.flag_buf_ptr += count;
		tty->flip.count += count;
		
		if (byte_count > 0) {
			printk(KERN_DEBUG "ISICOM: Intr(0x%x:%d): Flip buffer overflow! dropping bytes...\n",
					base, channel+1);
			while(byte_count > 0) { /* drain out unread xtra data */
				inw(base);
				byte_count -= 2;
			}
		}
		schedule_delayed_work(&tty->flip.work, 1);
	}
	if (card->isa == YES)
		ClearInterrupt(base);
	else
		outw(0x0000, base+0x04); /* enable interrupts */	
	return IRQ_HANDLED;
} 

 /* called with interrupts disabled */ 
static void isicom_config_port(struct isi_port * port)
{
	struct isi_board * card = port->card;
	struct tty_struct * tty;
	unsigned long baud;
	unsigned short channel_setup, wait, base = card->base;
	unsigned short channel = port->channel, shift_count = card->shift_count;
	unsigned char flow_ctrl;
	
	if (!(tty = port->tty) || !tty->termios)
		return;
	baud = C_BAUD(tty);
	if (baud & CBAUDEX) {
		baud &= ~CBAUDEX;
		
		/*  if CBAUDEX bit is on and the baud is set to either 50 or 75
		 *  then the card is programmed for 57.6Kbps or 115Kbps
		 *  respectively.
		 */   
		 
		if (baud < 1 || baud > 2)
			port->tty->termios->c_cflag &= ~CBAUDEX;
		else
			baud += 15;
	}	
	if (baud == 15) {
	
		/*  the ASYNC_SPD_HI and ASYNC_SPD_VHI options are set 
		 *  by the set_serial_info ioctl ... this is done by
		 *  the 'setserial' utility.
		 */  
			
		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
			baud++;     /*  57.6 Kbps */
		if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
			baud +=2;   /*  115  Kbps */	 
	}
	if (linuxb_to_isib[baud] == -1) {
		/* hang up */
	 	drop_dtr(port);
	 	return;
	}	
	else  
		raise_dtr(port);
		
	wait = 100;	
	while (((inw(base + 0x0e) & 0x0001) == 0) && (wait-- > 0));	
	if (!wait) {
		printk(KERN_WARNING "ISICOM: Card found busy in isicom_config_port at channel setup.\n");
		return;
	}			 
	outw(0x8000 | (channel << shift_count) |0x03, base);
	outw(linuxb_to_isib[baud] << 8 | 0x03, base);
	channel_setup = 0;
	switch(C_CSIZE(tty)) {
		case CS5:
			channel_setup |= ISICOM_CS5;
			break;
		case CS6:
			channel_setup |= ISICOM_CS6;
			break;
		case CS7:
			channel_setup |= ISICOM_CS7;
			break;
		case CS8:
			channel_setup |= ISICOM_CS8;
			break;
	}
		
	if (C_CSTOPB(tty))
		channel_setup |= ISICOM_2SB;
	
	if (C_PARENB(tty))
		channel_setup |= ISICOM_EVPAR;
	if (C_PARODD(tty))
		channel_setup |= ISICOM_ODPAR;	
	outw(channel_setup, base);	
	InterruptTheCard(base);
	
	if (C_CLOCAL(tty))
		port->flags &= ~ASYNC_CHECK_CD;
	else
		port->flags |= ASYNC_CHECK_CD;	
	
	/* flow control settings ...*/
	flow_ctrl = 0;
	port->flags &= ~ASYNC_CTS_FLOW;
	if (C_CRTSCTS(tty)) {
		port->flags |= ASYNC_CTS_FLOW;
		flow_ctrl |= ISICOM_CTSRTS;
	}	
	if (I_IXON(tty))	
		flow_ctrl |= ISICOM_RESPOND_XONXOFF;
	if (I_IXOFF(tty))
		flow_ctrl |= ISICOM_INITIATE_XONXOFF;	
		
	wait = 100;	
	while (((inw(base + 0x0e) & 0x0001) == 0) && (wait-- > 0));	
	if (!wait) {
		printk(KERN_WARNING "ISICOM: Card found busy in isicom_config_port at flow setup.\n");
		return;
	}			 
	outw(0x8000 | (channel << shift_count) |0x04, base);
	outw(flow_ctrl << 8 | 0x05, base);
	outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
	InterruptTheCard(base);
	
	/*	rx enabled -> enable port for rx on the card	*/
	if (C_CREAD(tty)) {
		card->port_status |= (1 << channel);
		outw(card->port_status, base + 0x02);
	}
		
}
 
/* open et all */ 

static inline void isicom_setup_board(struct isi_board * bp)
{
	int channel;
	struct isi_port * port;
	unsigned long flags;
	
	if (bp->status & BOARD_ACTIVE) 
		return;
	port = bp->ports;
#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "ISICOM: setup_board: drop_dtr_rts start, port_count %d...\n", bp->port_count);
#endif
	for(channel = 0; channel < bp->port_count; channel++, port++) {
		save_flags(flags); cli();
		drop_dtr_rts(port);
		restore_flags(flags);
	}
#ifdef ISICOM_DEBUG		
	printk(KERN_DEBUG "ISICOM: setup_board: drop_dtr_rts stop...\n");	
#endif	
	
	bp->status |= BOARD_ACTIVE;
	return;
}
 
static int isicom_setup_port(struct isi_port * port)
{
	struct isi_board * card = port->card;
	unsigned long flags;
	
	if (port->flags & ASYNC_INITIALIZED)
		return 0;
	if (!port->xmit_buf) {
		unsigned long page;
		
		if (!(page = get_zeroed_page(GFP_KERNEL)))
			return -ENOMEM;
		
		if (port->xmit_buf) {
			free_page(page);
			return -ERESTARTSYS;
		}
		port->xmit_buf = (unsigned char *) page;	
	}	
	save_flags(flags); cli();
	if (port->tty)
		clear_bit(TTY_IO_ERROR, &port->tty->flags);
	if (port->count == 1)
		card->count++;
		
	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
	
	/*	discard any residual data	*/
	kill_queue(port, ISICOM_KILLTX | ISICOM_KILLRX);
	
	isicom_config_port(port);
	port->flags |= ASYNC_INITIALIZED;
	
	restore_flags(flags);
	
	return 0;		
} 
 
static int block_til_ready(struct tty_struct * tty, struct file * filp, struct isi_port * port) 
{
	int do_clocal = 0, retval;
	DECLARE_WAITQUEUE(wait, current);

	/* block if port is in the process of being closed */

	if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
#ifdef ISICOM_DEBUG	
		printk(KERN_DEBUG "ISICOM: block_til_ready: close in progress.\n");
#endif		
		interruptible_sleep_on(&port->close_wait);
		if (port->flags & ASYNC_HUP_NOTIFY)
			return -EAGAIN;
		else
			return -ERESTARTSYS;
	}
	
	/* if non-blocking mode is set ... */
	
	if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) {
#ifdef ISICOM_DEBUG	
		printk(KERN_DEBUG "ISICOM: block_til_ready: non-block mode.\n");
#endif		
		port->flags |= ASYNC_NORMAL_ACTIVE;
		return 0;	
	}	
	
	if (C_CLOCAL(tty))
		do_clocal = 1;
#ifdef ISICOM_DEBUG	
	if (do_clocal)
		printk(KERN_DEBUG "ISICOM: block_til_ready: CLOCAL set.\n");
#endif 		
	
	/* block waiting for DCD to be asserted, and while 
						callout dev is busy */
	retval = 0;
	add_wait_queue(&port->open_wait, &wait);
	cli();
		if (!tty_hung_up_p(filp))
			port->count--;
	sti();
	port->blocked_open++;
#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "ISICOM: block_til_ready: waiting for DCD...\n");
#endif	
	while (1) {
		cli();
		raise_dtr_rts(port);
		sti();
		set_current_state(TASK_INTERRUPTIBLE);
		if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) { 	
			if (port->flags & ASYNC_HUP_NOTIFY)
				retval = -EAGAIN;
			else
				retval = -ERESTARTSYS;
#ifdef ISICOM_DEBUG				
			printk(KERN_DEBUG "ISICOM: block_til_ready: tty_hung_up_p || not init.\n"); 
#endif			
			break;
		}	
		if (!(port->flags & ASYNC_CLOSING) &&
		    (do_clocal || (port->status & ISI_DCD))) {
#ifdef ISICOM_DEBUG		    
		 	printk(KERN_DEBUG "ISICOM: block_til_ready: do_clocal || DCD.\n");   
#endif		 	
			break;
		}	
		if (signal_pending(current)) {
#ifdef ISICOM_DEBUG		
			printk(KERN_DEBUG "ISICOM: block_til_ready: sig blocked.\n");
#endif			
			retval = -ERESTARTSYS;
			break;
		}
		schedule();		
	}
	set_current_state(TASK_RUNNING);
	remove_wait_queue(&port->open_wait, &wait);
	if (!tty_hung_up_p(filp))
		port->count++;
	port->blocked_open--;
	if (retval)
		return retval;
	port->flags |= ASYNC_NORMAL_ACTIVE;
	return 0;
}
 
static int isicom_open(struct tty_struct * tty, struct file * filp)
{
	struct isi_port * port;
	struct isi_board * card;
	unsigned int line, board;
	int error;

#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "ISICOM: open start!!!.\n");
#endif	
	line = tty->index;
	
#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "line = %d.\n", line);
#endif	
	
	if ((line < 0) || (line > (PORT_COUNT-1)))
		return -ENODEV;
	board = BOARD(line);
	
#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "board = %d.\n", board);
#endif	
	
	card = &isi_card[board];
	if (!(card->status & FIRMWARE_LOADED)) {
#ifdef ISICOM_DEBUG	
		printk(KERN_DEBUG"ISICOM: Firmware not loaded to card%d.\n", board);
#endif		
		return -ENODEV;
	}
	
	/*  open on a port greater than the port count for the card !!! */
	if (line > ((board * 16) + card->port_count - 1)) {
		printk(KERN_ERR "ISICOM: Open on a port which exceeds the port_count of the card!\n");
		return -ENODEV;
	}	
	port = &isi_ports[line];	
	if (isicom_paranoia_check(port, tty->name, "isicom_open"))
		return -ENODEV;
		
#ifdef ISICOM_DEBUG		
	printk(KERN_DEBUG "ISICOM: isicom_setup_board ...\n");		
#endif	
	isicom_setup_board(card);		
	
	port->count++;
	tty->driver_data = port;
	port->tty = tty;
#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "ISICOM: isicom_setup_port ...\n");
#endif	
	if ((error = isicom_setup_port(port))!=0)
		return error;
#ifdef ISICOM_DEBUG		
	printk(KERN_DEBUG "ISICOM: block_til_ready ...\n");	
#endif	
	if ((error = block_til_ready(tty, filp, port))!=0)
		return error;

#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "ISICOM: open end!!!.\n");
#endif	
	return 0;      		
}
 
/* close et all */

static inline void isicom_shutdown_board(struct isi_board * bp)
{
	int channel;
	struct isi_port * port;
	
	if (!(bp->status & BOARD_ACTIVE))
		return;
	bp->status &= ~BOARD_ACTIVE;
	port = bp->ports;
	for(channel = 0; channel < bp->port_count; channel++, port++) {
		drop_dtr_rts(port);
	}	
}

static void isicom_shutdown_port(struct isi_port * port)
{
	struct isi_board * card = port->card;
	struct tty_struct * tty;	
	
	if (!(port->flags & ASYNC_INITIALIZED))
		return;
	if (port->xmit_buf) {
		free_page((unsigned long) port->xmit_buf);
		port->xmit_buf = NULL;
	}	
	if (!(tty = port->tty) || C_HUPCL(tty)) 
		/* drop dtr on this port */
		drop_dtr(port);
		
	/* any other port uninits  */ 
	
	if (tty)
		set_bit(TTY_IO_ERROR, &tty->flags);
	port->flags &= ~ASYNC_INITIALIZED;
	
	if (--card->count < 0) {
		printk(KERN_DEBUG "ISICOM: isicom_shutdown_port: bad board(0x%x) count %d.\n",
			card->base, card->count);
		card->count = 0;	
	}
	
	/* last port was closed , shutdown that boad too */
	if (!card->count)
		isicom_shutdown_board(card);
}

static void isicom_close(struct tty_struct * tty, struct file * filp)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	struct isi_board * card = port->card;
	unsigned long flags;
	
	if (!port)
		return;
	if (isicom_paranoia_check(port, tty->name, "isicom_close"))
		return;
	
#ifdef ISICOM_DEBUG		
	printk(KERN_DEBUG "ISICOM: Close start!!!.\n");
#endif	
	
	save_flags(flags); cli();
	if (tty_hung_up_p(filp)) {
		restore_flags(flags);
		return;
	}
	
	if ((tty->count == 1) && (port->count != 1)) {
		printk(KERN_WARNING "ISICOM:(0x%x) isicom_close: bad port count"
			"tty->count = 1	port count = %d.\n",
			card->base, port->count);
		port->count = 1;
	}
	if (--port->count < 0) {
		printk(KERN_WARNING "ISICOM:(0x%x) isicom_close: bad port count for"
			"channel%d = %d", card->base, port->channel, 
			port->count);
		port->count = 0;	
	}
	
	if (port->count) {
		restore_flags(flags);
		return;
	} 	
	port->flags |= ASYNC_CLOSING;
	tty->closing = 1;
	if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
		tty_wait_until_sent(tty, port->closing_wait);
	/* indicate to the card that no more data can be received 
	   on this port */
	if (port->flags & ASYNC_INITIALIZED) {   
		card->port_status &= ~(1 << port->channel);
		outw(card->port_status, card->base + 0x02);
	}	
	isicom_shutdown_port(port);
	if (tty->driver->flush_buffer)
		tty->driver->flush_buffer(tty);
	if (tty->ldisc.flush_buffer)
		tty->ldisc.flush_buffer(tty);
	tty->closing = 0;
	port->tty = 0;
	if (port->blocked_open) {
		if (port->close_delay) {
			set_current_state(TASK_INTERRUPTIBLE);
#ifdef ISICOM_DEBUG			
			printk(KERN_DEBUG "ISICOM: scheduling until time out.\n");
#endif			
			schedule_timeout(port->close_delay);
		}
		wake_up_interruptible(&port->open_wait);
	}	
	port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
	wake_up_interruptible(&port->close_wait);
	restore_flags(flags);
#ifdef ISICOM_DEBUG	
	printk(KERN_DEBUG "ISICOM: Close end!!!.\n");
#endif	
}

/* write et all */
static int isicom_write(struct tty_struct * tty, int from_user,
			const unsigned char * buf, int count)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	unsigned long flags;
	int cnt, total = 0;
#ifdef ISICOM_DEBUG
	printk(KERN_DEBUG "ISICOM: isicom_write for port%d: %d bytes.\n",
			port->channel+1, count);
#endif	  	
	if (isicom_paranoia_check(port, tty->name, "isicom_write"))
		return 0;
	
	if (!tty || !port->xmit_buf || !tmp_buf)
		return 0;
	if (from_user)
		down(&tmp_buf_sem); /* acquire xclusive access to tmp_buf */
		
	save_flags(flags);
	while(1) {	
		cli();
		cnt = MIN(count, MIN(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
			SERIAL_XMIT_SIZE - port->xmit_head));
		if (cnt <= 0) 
			break;
		
		if (from_user) {
			/* the following may block for paging... hence 
			   enabling interrupts but tx routine may have 
			   created more space in xmit_buf when the ctrl 
			   gets back here  */
			sti(); 
			if (copy_from_user(tmp_buf, buf, cnt)) {
				up(&tmp_buf_sem);
				restore_flags(flags);
				return -EFAULT;
			}
			cli();
			cnt = MIN(cnt, MIN(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
			SERIAL_XMIT_SIZE - port->xmit_head));
			memcpy(port->xmit_buf + port->xmit_head, tmp_buf, cnt);
		}	
		else
			memcpy(port->xmit_buf + port->xmit_head, buf, cnt);
		port->xmit_head = (port->xmit_head + cnt) & (SERIAL_XMIT_SIZE - 1);
		port->xmit_cnt += cnt;
		restore_flags(flags);
		buf += cnt;
		count -= cnt;
		total += cnt;
	}		
	if (from_user)
		up(&tmp_buf_sem);
	if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped)
		port->status |= ISI_TXOK;
	restore_flags(flags);
#ifdef ISICOM_DEBUG
	printk(KERN_DEBUG "ISICOM: isicom_write %d bytes written.\n", total);
#endif		
	return total;	
}

/* put_char et all */
static void isicom_put_char(struct tty_struct * tty, unsigned char ch)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	unsigned long flags;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_put_char"))
		return;
	
	if (!tty || !port->xmit_buf)
		return;
#ifdef ISICOM_DEBUG
	printk(KERN_DEBUG "ISICOM: put_char, port %d, char %c.\n", port->channel+1, ch);
#endif			
		
	save_flags(flags); cli();
	
	if (port->xmit_cnt >= (SERIAL_XMIT_SIZE - 1)) {
		restore_flags(flags);
		return;
	}
	
	port->xmit_buf[port->xmit_head++] = ch;
	port->xmit_head &= (SERIAL_XMIT_SIZE - 1);
	port->xmit_cnt++;
	restore_flags(flags);
}

/* flush_chars et all */
static void isicom_flush_chars(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_flush_chars"))
		return;
	
	if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
	    !port->xmit_buf)
		return;
		
	/* this tells the transmitter to consider this port for
	   data output to the card ... that's the best we can do. */
	port->status |= ISI_TXOK;	
}

/* write_room et all */
static int isicom_write_room(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	int free;
	if (isicom_paranoia_check(port, tty->name, "isicom_write_room"))
		return 0;
	
	free = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
	if (free < 0)
		free = 0;
	return free;
}

/* chars_in_buffer et all */
static int isicom_chars_in_buffer(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	if (isicom_paranoia_check(port, tty->name, "isicom_chars_in_buffer"))
		return 0;
	return port->xmit_cnt;
}

/* ioctl et all */
static inline void isicom_send_break(struct isi_port * port, unsigned long length)
{
	struct isi_board * card = port->card;
	short wait = 10;
	unsigned short base = card->base;	
	unsigned long flags;
	
	save_flags(flags); cli();
	while (((inw(base + 0x0e) & 0x0001) == 0) && (wait-- > 0));	
	if (!wait) {
		printk(KERN_DEBUG "ISICOM: Card found busy in isicom_send_break.\n");
		goto out;
	}	
	outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
	outw((length & 0xff) << 8 | 0x00, base);
	outw((length & 0xff00), base);
	InterruptTheCard(base);
out:	restore_flags(flags);
}

static int isicom_tiocmget(struct tty_struct *tty, struct file *file)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	/* just send the port status */
	unsigned short status = port->status;

	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
		return -ENODEV;
	
	return  ((status & ISI_RTS) ? TIOCM_RTS : 0) |
		((status & ISI_DTR) ? TIOCM_DTR : 0) |
		((status & ISI_DCD) ? TIOCM_CAR : 0) |
		((status & ISI_DSR) ? TIOCM_DSR : 0) |
		((status & ISI_CTS) ? TIOCM_CTS : 0) |
		((status & ISI_RI ) ? TIOCM_RI  : 0);
}

static int isicom_tiocmset(struct tty_struct *tty, struct file *file,
			   unsigned int set, unsigned int clear)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	unsigned int arg;
	unsigned long flags;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
		return -ENODEV;
	
	save_flags(flags); cli();
	if (set & TIOCM_RTS)
		raise_rts(port);
	if (set & TIOCM_DTR)
		raise_dtr(port);

	if (clear & TIOCM_RTS)
		drop_rts(port);
	if (clear & TIOCM_DTR)
		drop_dtr(port);

	restore_flags(flags);
	return 0;
}			

static int isicom_set_serial_info(struct isi_port * port,
					struct serial_struct * info)
{
	struct serial_struct newinfo;
	unsigned long flags;
	int reconfig_port;

	if(copy_from_user(&newinfo, info, sizeof(newinfo)))
		return -EFAULT;
		
	reconfig_port = ((port->flags & ASYNC_SPD_MASK) != 
			 (newinfo.flags & ASYNC_SPD_MASK));
	
	if (!capable(CAP_SYS_ADMIN)) {
		if ((newinfo.close_delay != port->close_delay) ||
		    (newinfo.closing_wait != port->closing_wait) ||
		    ((newinfo.flags & ~ASYNC_USR_MASK) != 
		     (port->flags & ~ASYNC_USR_MASK)))
			return -EPERM;
		port->flags = ((port->flags & ~ ASYNC_USR_MASK) |
				(newinfo.flags & ASYNC_USR_MASK));
	}	
	else {
		port->close_delay = newinfo.close_delay;
		port->closing_wait = newinfo.closing_wait; 
		port->flags = ((port->flags & ~ASYNC_FLAGS) | 
				(newinfo.flags & ASYNC_FLAGS));
	}
	if (reconfig_port) {
		save_flags(flags); cli();
		isicom_config_port(port);
		restore_flags(flags);
	}
	return 0;		 
}		

static int isicom_get_serial_info(struct isi_port * port, 
					struct serial_struct * info)
{
	struct serial_struct out_info;
	
	memset(&out_info, 0, sizeof(out_info));
/*	out_info.type = ? */
	out_info.line = port - isi_ports;
	out_info.port = port->card->base;
	out_info.irq = port->card->irq;
	out_info.flags = port->flags;
/*	out_info.baud_base = ? */
	out_info.close_delay = port->close_delay;
	out_info.closing_wait = port->closing_wait;
	if(copy_to_user(info, &out_info, sizeof(out_info)))
		return -EFAULT;
	return 0;
}					

static int isicom_ioctl(struct tty_struct * tty, struct file * filp,
			unsigned int cmd, unsigned long arg) 
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	int retval;

	if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
		return -ENODEV;

	switch(cmd) {
		case TCSBRK:
			retval = tty_check_change(tty);
			if (retval)
				return retval;
			tty_wait_until_sent(tty, 0);
			if (!arg)
				isicom_send_break(port, HZ/4);
			return 0;
			
		case TCSBRKP:	
			retval = tty_check_change(tty);
			if (retval)
				return retval;
			tty_wait_until_sent(tty, 0);
			isicom_send_break(port, arg ? arg * (HZ/10) : HZ/4);
			return 0;
			
		case TIOCGSOFTCAR:
			return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long *) arg);
			
		case TIOCSSOFTCAR:
			if(get_user(arg, (unsigned long *) arg))
				return -EFAULT;
			tty->termios->c_cflag =
				((tty->termios->c_cflag & ~CLOCAL) |
				(arg ? CLOCAL : 0));
			return 0;	
			
		case TIOCGSERIAL:
			return isicom_get_serial_info(port, 
					(struct serial_struct *) arg);
		
		case TIOCSSERIAL:
			return isicom_set_serial_info(port,
					(struct serial_struct *) arg);
					
		default:
			return -ENOIOCTLCMD;						
	}
	return 0;
}

/* set_termios et all */
static void isicom_set_termios(struct tty_struct * tty, struct termios * old_termios)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	unsigned long flags;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_set_termios"))
		return;
	
	if (tty->termios->c_cflag == old_termios->c_cflag &&
	    tty->termios->c_iflag == old_termios->c_iflag)
		return;
		
	save_flags(flags); cli();
	isicom_config_port(port);
	restore_flags(flags);
	
	if ((old_termios->c_cflag & CRTSCTS) &&
	    !(tty->termios->c_cflag & CRTSCTS)) {	
		tty->hw_stopped = 0;
		isicom_start(tty);   
	}    
}

/* throttle et all */
static void isicom_throttle(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	struct isi_board * card = port->card;
	unsigned long flags;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_throttle"))
		return;
	
	/* tell the card that this port cannot handle any more data for now */
	save_flags(flags); cli();
	card->port_status &= ~(1 << port->channel);
	outw(card->port_status, card->base + 0x02);
	restore_flags(flags);
}

/* unthrottle et all */
static void isicom_unthrottle(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	struct isi_board * card = port->card;
	unsigned long flags;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_unthrottle"))
		return;
	
	/* tell the card that this port is ready to accept more data */
	save_flags(flags); cli();
	card->port_status |= (1 << port->channel);
	outw(card->port_status, card->base + 0x02);
	restore_flags(flags);
}

/* stop et all */
static void isicom_stop(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;

	if (isicom_paranoia_check(port, tty->name, "isicom_stop"))
		return;
	
	/* this tells the transmitter not to consider this port for
	   data output to the card. */
	port->status &= ~ISI_TXOK;
}

/* start et all */
static void isicom_start(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_start"))
		return;
	
	/* this tells the transmitter to consider this port for
	   data output to the card. */
	port->status |= ISI_TXOK;
}

/* hangup et all */
static void do_isicom_hangup(void * data)
{
	struct isi_port * port = (struct isi_port *) data;
	struct tty_struct * tty;
	
	tty = port->tty;
	if (tty)
		tty_hangup(tty);	/* FIXME: module removal race here - AKPM */
}

static void isicom_hangup(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
		return;
	
	isicom_shutdown_port(port);
	port->count = 0;
	port->flags &= ~ASYNC_NORMAL_ACTIVE;
	port->tty = 0;
	wake_up_interruptible(&port->open_wait);
}

/* flush_buffer et all */
static void isicom_flush_buffer(struct tty_struct * tty)
{
	struct isi_port * port = (struct isi_port *) tty->driver_data;
	unsigned long flags;
	
	if (isicom_paranoia_check(port, tty->name, "isicom_flush_buffer"))
		return;
	
	save_flags(flags); cli();
	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
	restore_flags(flags);
	
	wake_up_interruptible(&tty->write_wait);
	if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
	    tty->ldisc.write_wakeup)
		(tty->ldisc.write_wakeup)(tty);
}


static int register_ioregion(void)
{
	int count, done=0;
	for (count=0; count < BOARD_COUNT; count++ ) {
		if (isi_card[count].base)
			if (!request_region(isi_card[count].base,16,ISICOM_NAME)) {
				printk(KERN_DEBUG "ISICOM: I/O Region 0x%x-0x%x is busy. Card%d will be disabled.\n",
					isi_card[count].base,isi_card[count].base+15,count+1);
				isi_card[count].base=0;
				done++;
			}
	}
	return done;
}

static void unregister_ioregion(void)
{
	int count;
	for (count=0; count < BOARD_COUNT; count++ ) 
		if (isi_card[count].base) {
			release_region(isi_card[count].base,16);
#ifdef ISICOM_DEBUG			
			printk(KERN_DEBUG "ISICOM: I/O Region 0x%x-0x%x released for Card%d.\n",isi_card[count].base,isi_card[count].base+15,count+1);
#endif			
		}
}

static struct tty_operations isicom_ops = {
	.open	= isicom_open,
	.close	= isicom_close,
	.write	= isicom_write,
	.put_char	= isicom_put_char,
	.flush_chars	= isicom_flush_chars,
	.write_room	= isicom_write_room,
	.chars_in_buffer	= isicom_chars_in_buffer,
	.ioctl	= isicom_ioctl,
	.set_termios	= isicom_set_termios,
	.throttle	= isicom_throttle,
	.unthrottle	= isicom_unthrottle,
	.stop	= isicom_stop,
	.start	= isicom_start,
	.hangup	= isicom_hangup,
	.flush_buffer	= isicom_flush_buffer,
	.tiocmget	= isicom_tiocmget,
	.tiocmset	= isicom_tiocmset,
};

static int register_drivers(void)
{
	int error;

	/* tty driver structure initialization */
	isicom_normal = alloc_tty_driver(PORT_COUNT);
	if (!isicom_normal)
		return -ENOMEM;

	isicom_normal->owner	= THIS_MODULE;
	isicom_normal->name 	= "ttyM";
	isicom_normal->devfs_name = "isicom/";
	isicom_normal->major	= ISICOM_NMAJOR;
	isicom_normal->minor_start	= 0;
	isicom_normal->type	= TTY_DRIVER_TYPE_SERIAL;
	isicom_normal->subtype	= SERIAL_TYPE_NORMAL;
	isicom_normal->init_termios	= tty_std_termios;
	isicom_normal->init_termios.c_cflag	= 
				B9600 | CS8 | CREAD | HUPCL |CLOCAL;
	isicom_normal->flags	= TTY_DRIVER_REAL_RAW;
	tty_set_operations(isicom_normal, &isicom_ops);
	
	if ((error=tty_register_driver(isicom_normal))!=0) {
		printk(KERN_DEBUG "ISICOM: Couldn't register the dialin driver, error=%d\n",
			error);
		put_tty_driver(isicom_normal);
		return error;
	}
	return 0;
}

static void unregister_drivers(void)
{
	int error;
	if (tty_unregister_driver(isicom_normal))
		printk(KERN_DEBUG "ISICOM: couldn't unregister normal driver error=%d.\n",error);
	put_tty_driver(isicom_normal);
}

static int register_isr(void)
{
	int count, done=0, card;
	int flag;
	unsigned char request;
	for (count=0; count < BOARD_COUNT; count++ ) {
		if (isi_card[count].base) {
		/*
		 * verify if the required irq has already been requested for
		 * another ISI Card, if so we already have it, else request it
		 */
			request = YES;
			for(card = 0; card < count; card++)
			if ((isi_card[card].base) && (isi_card[card].irq == isi_card[count].irq)) {
				request = NO;
				if ((isi_card[count].isa == NO) && (isi_card[card].isa == NO))
					break;
				/*
				 * ISA cards cannot share interrupts with other
				 * PCI or ISA devices hence disable this card.
				 */
				release_region(isi_card[count].base,16);
				isi_card[count].base = 0;
				break;
			}
			flag=0;
			if(isi_card[count].isa == NO)
				flag |= SA_SHIRQ;
				
			if (request == YES) { 
				if (request_irq(isi_card[count].irq, isicom_interrupt, SA_INTERRUPT|flag, ISICOM_NAME, NULL)) {
					printk(KERN_WARNING "ISICOM: Could not install handler at Irq %d. Card%d will be disabled.\n",
						isi_card[count].irq, count+1);
					release_region(isi_card[count].base,16);
					isi_card[count].base=0;
				}
				else {
					printk(KERN_INFO "ISICOM: Card%d at 0x%x using irq %d.\n", 
					count+1, isi_card[count].base, isi_card[count].irq); 
					
					irq_to_board[isi_card[count].irq]=&isi_card[count];
					done++;
				}
			}
		}	
	}
	return done;
}

static void unregister_isr(void)
{
	int count, card;
	unsigned char freeirq;
	for (count=0; count < BOARD_COUNT; count++ ) {
		if (isi_card[count].base) {
			freeirq = YES;
			for(card = 0; card < count; card++)
				if ((isi_card[card].base) && (isi_card[card].irq == isi_card[count].irq)) {
					freeirq = NO;
					break;
				}
			if (freeirq == YES) {
				free_irq(isi_card[count].irq, NULL);
#ifdef ISICOM_DEBUG			
				printk(KERN_DEBUG "ISICOM: Irq %d released for Card%d.\n",isi_card[count].irq, count+1);
#endif	
			}		
		}
	}
}

static int isicom_init(void)
{
	int card, channel, base;
	struct isi_port * port;
	unsigned long page;
	
	if (!tmp_buf) { 
		page = get_zeroed_page(GFP_KERNEL);
	      	if (!page) {
#ifdef ISICOM_DEBUG	      	
	      		printk(KERN_DEBUG "ISICOM: Couldn't allocate page for tmp_buf.\n");
#else
			printk(KERN_ERR "ISICOM: Not enough memory...\n");
#endif	      
	      		return 0;
	      	}	
	      	tmp_buf = (unsigned char *) page;
	}
	
	if (!register_ioregion()) 
	{
		printk(KERN_ERR "ISICOM: All required I/O space found busy.\n");
		free_page((unsigned long)tmp_buf);
		return 0;
	}
	if (register_drivers()) 
	{
		unregister_ioregion();
		free_page((unsigned long)tmp_buf);
		return 0;
	}
	if (!register_isr()) 
	{
		unregister_drivers();
		/*  ioports already uregistered in register_isr */
		free_page((unsigned long)tmp_buf);
		return 0;		
	}
	
	memset(isi_ports, 0, sizeof(isi_ports));
	for (card = 0; card < BOARD_COUNT; card++) {
		port = &isi_ports[card * 16];
		isi_card[card].ports = port;
		base = isi_card[card].base;
		for (channel = 0; channel < 16; channel++, port++) {
			port->magic = ISICOM_MAGIC;
			port->card = &isi_card[card];
			port->channel = channel;		
		 	port->close_delay = 50 * HZ/100;
		 	port->closing_wait = 3000 * HZ/100;
		 	INIT_WORK(&port->hangup_tq, do_isicom_hangup, port);
		 	INIT_WORK(&port->bh_tqueue, isicom_bottomhalf, port);
		 	port->status = 0;
			init_waitqueue_head(&port->open_wait);	 				
			init_waitqueue_head(&port->close_wait);
			/*  . . .  */
 		}
	} 
	
	return 1;	
}

/*
 *	Insmod can set static symbols so keep these static
 */
 
static int io[4];
static int irq[4];

MODULE_AUTHOR("MultiTech");
MODULE_DESCRIPTION("Driver for the ISI series of cards by MultiTech");
MODULE_LICENSE("GPL");
MODULE_PARM(io, "1-4i");
MODULE_PARM_DESC(io, "I/O ports for the cards");
MODULE_PARM(irq, "1-4i");
MODULE_PARM_DESC(irq, "Interrupts for the cards");

int init_module(void)
{
	struct pci_dev *dev = NULL;
	int retval, card, idx, count;
	unsigned char pciirq;
	unsigned int ioaddr;
	                
	card = 0;
	for(idx=0; idx < BOARD_COUNT; idx++) {	
		if (io[idx]) {
			isi_card[idx].base=io[idx];
			isi_card[idx].irq=irq[idx];
			isi_card[idx].isa=YES;
			card++;
		}
		else {
			isi_card[idx].base = 0;
			isi_card[idx].irq = 0;
		}
	}
	
	for (idx=0 ;idx < card; idx++) {
		if (!((isi_card[idx].irq==2)||(isi_card[idx].irq==3)||
		    (isi_card[idx].irq==4)||(isi_card[idx].irq==5)||
		    (isi_card[idx].irq==7)||(isi_card[idx].irq==10)||
		    (isi_card[idx].irq==11)||(isi_card[idx].irq==12)||
		    (isi_card[idx].irq==15))) {
			
			if (isi_card[idx].base) {
				printk(KERN_ERR "ISICOM: Irq %d unsupported. Disabling Card%d...\n",
					isi_card[idx].irq, idx+1);
				isi_card[idx].base=0;
				card--;
			}	
		}
	}	
	
	if (card < BOARD_COUNT) {
		for (idx=0; idx < DEVID_COUNT; idx++) {
			dev = NULL;
			for (;;){
				if (!(dev = pci_find_device(VENDOR_ID, isicom_pci_tbl[idx].device, dev)))
					break;
				if (card >= BOARD_COUNT)
					break;
					
				if (pci_enable_device(dev))
					break;

				/* found a PCI ISI card! */
				ioaddr = pci_resource_start (dev, 3); /* i.e at offset 0x1c in the
								       * PCI configuration register
								       * space.
								       */
				pciirq = dev->irq;
				printk(KERN_INFO "ISI PCI Card(Device ID 0x%x)\n", isicom_pci_tbl[idx].device);
				/*
				 * allot the first empty slot in the array
				 */				
				for (count=0; count < BOARD_COUNT; count++) {				
					if (isi_card[count].base == 0) {
						isi_card[count].base = ioaddr;
						isi_card[count].irq = pciirq;
						isi_card[count].isa = NO;
						card++;
						break;
					}
				}
			}				
			if (card >= BOARD_COUNT) break;
		}
	}
	
	if (!(isi_card[0].base || isi_card[1].base || isi_card[2].base || isi_card[3].base)) {
		printk(KERN_ERR "ISICOM: No valid card configuration. Driver cannot be initialized...\n"); 
		return -EIO;
	}	

	retval = misc_register(&isiloader_device);
	if (retval < 0) {
		printk(KERN_ERR "ISICOM: Unable to register firmware loader driver.\n");
		return retval;
	}
	
	if (!isicom_init()) {
		if (misc_deregister(&isiloader_device)) 
			printk(KERN_ERR "ISICOM: Unable to unregister Firmware Loader driver\n");
		return -EIO;
	}
	
	init_timer(&tx);
	tx.expires = jiffies + 1;
	tx.data = 0;
	tx.function = isicom_tx;
	re_schedule = 1;
	add_timer(&tx);
	
	return 0;
}

void cleanup_module(void)
{
	re_schedule = 0;
	set_current_state(TASK_INTERRUPTIBLE);
	schedule_timeout(HZ);

#ifdef ISICOM_DEBUG	
	printk("ISICOM: isicom_tx tx_count = %ld.\n", tx_count);
#endif	

#ifdef ISICOM_DEBUG
	printk("ISICOM: uregistering isr ...\n");
#endif	
	unregister_isr();

#ifdef ISICOM_DEBUG	
	printk("ISICOM: unregistering drivers ...\n");
#endif
	unregister_drivers();
	
#ifdef ISICOM_DEBUG	
	printk("ISICOM: unregistering ioregion ...\n");
#endif	
	unregister_ioregion();	
	
#ifdef ISICOM_DEBUG	
	printk("ISICOM: freeing tmp_buf ...\n");
#endif	
	free_page((unsigned long)tmp_buf);
	
#ifdef ISICOM_DEBUG		
	printk("ISICOM: unregistering firmware loader ...\n");	
#endif
	if (misc_deregister(&isiloader_device))
		printk(KERN_ERR "ISICOM: Unable to unregister Firmware Loader driver\n");
}
