Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 3789 insertions, 0 deletions

diff --git a/drivers/char/epca.c b/drivers/char/epca.c
new file mode 100644
index 000000000000..6025e1866c7e
--- /dev/null
+++ b/drivers/char/epca.c
@@ -0,0 +1,3789 @@
+/*
+
+ 
+	Copyright (C) 1996  Digi International.
+ 
+	For technical support please email digiLinux@dgii.com or
+	call Digi tech support at (612) 912-3456
+
+	Much of this design and code came from epca.c which was 
+	copyright (C) 1994, 1995 Troy De Jongh, and subsquently 
+	modified by David Nugent, Christoph Lameter, Mike McLagan. 
+ 
+ 	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.
+
+ 	This program is distributed in the hope that it will be useful,
+ 	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ 	GNU General Public License for more details.
+
+ 	You should have received a copy of the GNU General Public License
+ 	along with this program; if not, write to the Free Software
+ 	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+--------------------------------------------------------------------------- */
+/* See README.epca for change history --DAT*/
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/delay.h>
+#include <linux/ctype.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_PCI
+#define ENABLE_PCI
+#endif /* CONFIG_PCI */
+
+#define putUser(arg1, arg2) put_user(arg1, (unsigned long __user *)arg2)
+#define getUser(arg1, arg2) get_user(arg1, (unsigned __user *)arg2)
+
+#ifdef ENABLE_PCI
+#include <linux/pci.h>
+#include "digiPCI.h"
+#endif /* ENABLE_PCI */
+
+#include "digi1.h"
+#include "digiFep1.h"
+#include "epca.h"
+#include "epcaconfig.h"
+
+#if BITS_PER_LONG != 32
+#  error FIXME: this driver only works on 32-bit platforms
+#endif
+
+/* ---------------------- Begin defines ------------------------ */
+
+#define VERSION            "1.3.0.1-LK"
+
+/* This major needs to be submitted to Linux to join the majors list */
+
+#define DIGIINFOMAJOR       35  /* For Digi specific ioctl */ 
+
+
+#define MAXCARDS 7
+#define epcaassert(x, msg)  if (!(x)) epca_error(__LINE__, msg)
+
+#define PFX "epca: "
+
+/* ----------------- Begin global definitions ------------------- */
+
+static char mesg[100];
+static int nbdevs, num_cards, liloconfig;
+static int digi_poller_inhibited = 1 ;
+
+static int setup_error_code;
+static int invalid_lilo_config;
+
+/* -----------------------------------------------------------------------
+	MAXBOARDS is typically 12, but ISA and EISA cards are restricted to 
+	7 below.
+--------------------------------------------------------------------------*/
+static struct board_info boards[MAXBOARDS];
+
+
+/* ------------- Begin structures used for driver registeration ---------- */
+
+static struct tty_driver *pc_driver;
+static struct tty_driver *pc_info;
+
+/* ------------------ Begin Digi specific structures -------------------- */
+
+/* ------------------------------------------------------------------------
+	digi_channels represents an array of structures that keep track of
+	each channel of the Digi product.  Information such as transmit and
+	receive pointers, termio data, and signal definitions (DTR, CTS, etc ...)
+	are stored here.  This structure is NOT used to overlay the cards 
+	physical channel structure.
+-------------------------------------------------------------------------- */
+  
+static struct channel digi_channels[MAX_ALLOC];
+
+/* ------------------------------------------------------------------------
+	card_ptr is an array used to hold the address of the
+	first channel structure of each card.  This array will hold
+	the addresses of various channels located in digi_channels.
+-------------------------------------------------------------------------- */
+static struct channel *card_ptr[MAXCARDS];
+
+static struct timer_list epca_timer;
+
+/* ---------------------- Begin function prototypes --------------------- */
+
+/* ----------------------------------------------------------------------
+	Begin generic memory functions.  These functions will be alias
+	(point at) more specific functions dependent on the board being
+	configured.
+----------------------------------------------------------------------- */
+	
+static inline void memwinon(struct board_info *b, unsigned int win);
+static inline void memwinoff(struct board_info *b, unsigned int win);
+static inline void globalwinon(struct channel *ch);
+static inline void rxwinon(struct channel *ch);
+static inline void txwinon(struct channel *ch);
+static inline void memoff(struct channel *ch);
+static inline void assertgwinon(struct channel *ch);
+static inline void assertmemoff(struct channel *ch);
+
+/* ---- Begin more 'specific' memory functions for cx_like products --- */
+
+static inline void pcxem_memwinon(struct board_info *b, unsigned int win);
+static inline void pcxem_memwinoff(struct board_info *b, unsigned int win);
+static inline void pcxem_globalwinon(struct channel *ch);
+static inline void pcxem_rxwinon(struct channel *ch);
+static inline void pcxem_txwinon(struct channel *ch);
+static inline void pcxem_memoff(struct channel *ch);
+
+/* ------ Begin more 'specific' memory functions for the pcxe ------- */
+
+static inline void pcxe_memwinon(struct board_info *b, unsigned int win);
+static inline void pcxe_memwinoff(struct board_info *b, unsigned int win);
+static inline void pcxe_globalwinon(struct channel *ch);
+static inline void pcxe_rxwinon(struct channel *ch);
+static inline void pcxe_txwinon(struct channel *ch);
+static inline void pcxe_memoff(struct channel *ch);
+
+/* ---- Begin more 'specific' memory functions for the pc64xe and pcxi ---- */
+/* Note : pc64xe and pcxi share the same windowing routines */
+
+static inline void pcxi_memwinon(struct board_info *b, unsigned int win);
+static inline void pcxi_memwinoff(struct board_info *b, unsigned int win);
+static inline void pcxi_globalwinon(struct channel *ch);
+static inline void pcxi_rxwinon(struct channel *ch);
+static inline void pcxi_txwinon(struct channel *ch);
+static inline void pcxi_memoff(struct channel *ch);
+
+/* - Begin 'specific' do nothing memory functions needed for some cards - */
+
+static inline void dummy_memwinon(struct board_info *b, unsigned int win);
+static inline void dummy_memwinoff(struct board_info *b, unsigned int win);
+static inline void dummy_globalwinon(struct channel *ch);
+static inline void dummy_rxwinon(struct channel *ch);
+static inline void dummy_txwinon(struct channel *ch);
+static inline void dummy_memoff(struct channel *ch);
+static inline void dummy_assertgwinon(struct channel *ch);
+static inline void dummy_assertmemoff(struct channel *ch);
+
+/* ------------------- Begin declare functions ----------------------- */
+
+static inline struct channel *verifyChannel(register struct tty_struct *);
+static inline void pc_sched_event(struct channel *, int);
+static void epca_error(int, char *);
+static void pc_close(struct tty_struct *, struct file *);
+static void shutdown(struct channel *);
+static void pc_hangup(struct tty_struct *);
+static void pc_put_char(struct tty_struct *, unsigned char);
+static int pc_write_room(struct tty_struct *);
+static int pc_chars_in_buffer(struct tty_struct *);
+static void pc_flush_buffer(struct tty_struct *);
+static void pc_flush_chars(struct tty_struct *);
+static int block_til_ready(struct tty_struct *, struct file *,
+                           struct channel *);
+static int pc_open(struct tty_struct *, struct file *);
+static void post_fep_init(unsigned int crd);
+static void epcapoll(unsigned long);
+static void doevent(int);
+static void fepcmd(struct channel *, int, int, int, int, int);
+static unsigned termios2digi_h(struct channel *ch, unsigned);
+static unsigned termios2digi_i(struct channel *ch, unsigned);
+static unsigned termios2digi_c(struct channel *ch, unsigned);
+static void epcaparam(struct tty_struct *, struct channel *);
+static void receive_data(struct channel *);
+static int pc_ioctl(struct tty_struct *, struct file *,
+                    unsigned int, unsigned long);
+static int info_ioctl(struct tty_struct *, struct file *,
+                    unsigned int, unsigned long);
+static void pc_set_termios(struct tty_struct *, struct termios *);
+static void do_softint(void *);
+static void pc_stop(struct tty_struct *);
+static void pc_start(struct tty_struct *);
+static void pc_throttle(struct tty_struct * tty);
+static void pc_unthrottle(struct tty_struct *tty);
+static void digi_send_break(struct channel *ch, int msec);
+static void setup_empty_event(struct tty_struct *tty, struct channel *ch);
+void epca_setup(char *, int *);
+void console_print(const char *);
+
+static int get_termio(struct tty_struct *, struct termio __user *);
+static int pc_write(struct tty_struct *, const unsigned char *, int);
+int pc_init(void);
+
+#ifdef ENABLE_PCI
+static int init_PCI(void);
+#endif /* ENABLE_PCI */
+
+
+/* ------------------------------------------------------------------
+	Table of functions for each board to handle memory.  Mantaining 
+	parallelism is a *very* good idea here.  The idea is for the 
+	runtime code to blindly call these functions, not knowing/caring    
+	about the underlying hardware.  This stuff should contain no
+	conditionals; if more functionality is needed a different entry
+	should be established.  These calls are the interface calls and 
+	are the only functions that should be accessed.  Anyone caught
+	making direct calls deserves what they get.
+-------------------------------------------------------------------- */
+
+static inline void memwinon(struct board_info *b, unsigned int win)
+{
+	(b->memwinon)(b, win);
+}
+
+static inline void memwinoff(struct board_info *b, unsigned int win)
+{
+	(b->memwinoff)(b, win);
+}
+
+static inline void globalwinon(struct channel *ch)
+{
+	(ch->board->globalwinon)(ch);
+}
+
+static inline void rxwinon(struct channel *ch)
+{
+	(ch->board->rxwinon)(ch);
+}
+
+static inline void txwinon(struct channel *ch)
+{
+	(ch->board->txwinon)(ch);
+}
+
+static inline void memoff(struct channel *ch)
+{
+	(ch->board->memoff)(ch);
+}
+static inline void assertgwinon(struct channel *ch)
+{
+	(ch->board->assertgwinon)(ch);
+}
+
+static inline void assertmemoff(struct channel *ch)
+{
+	(ch->board->assertmemoff)(ch);
+}
+
+/* ---------------------------------------------------------
+	PCXEM windowing is the same as that used in the PCXR 
+	and CX series cards.
+------------------------------------------------------------ */
+
+static inline void pcxem_memwinon(struct board_info *b, unsigned int win)
+{
+        outb_p(FEPWIN|win, (int)b->port + 1);
+}
+
+static inline void pcxem_memwinoff(struct board_info *b, unsigned int win)
+{
+	outb_p(0, (int)b->port + 1);
+}
+
+static inline void pcxem_globalwinon(struct channel *ch)
+{
+	outb_p( FEPWIN, (int)ch->board->port + 1);
+}
+
+static inline void pcxem_rxwinon(struct channel *ch)
+{
+	outb_p(ch->rxwin, (int)ch->board->port + 1);
+}
+
+static inline void pcxem_txwinon(struct channel *ch)
+{
+	outb_p(ch->txwin, (int)ch->board->port + 1);
+}
+
+static inline void pcxem_memoff(struct channel *ch)
+{
+	outb_p(0, (int)ch->board->port + 1);
+}
+
+/* ----------------- Begin pcxe memory window stuff ------------------ */
+
+static inline void pcxe_memwinon(struct board_info *b, unsigned int win)
+{
+               outb_p(FEPWIN | win, (int)b->port + 1);
+}
+
+static inline void pcxe_memwinoff(struct board_info *b, unsigned int win)
+{
+	outb_p(inb((int)b->port) & ~FEPMEM,
+	           (int)b->port + 1);
+	outb_p(0, (int)b->port + 1);
+}
+
+static inline void pcxe_globalwinon(struct channel *ch)
+{
+	outb_p( FEPWIN, (int)ch->board->port + 1);
+}
+
+static inline void pcxe_rxwinon(struct channel *ch)
+{
+		outb_p(ch->rxwin, (int)ch->board->port + 1);
+}
+
+static inline void pcxe_txwinon(struct channel *ch)
+{
+		outb_p(ch->txwin, (int)ch->board->port + 1);
+}
+
+static inline void pcxe_memoff(struct channel *ch)
+{
+	outb_p(0, (int)ch->board->port);
+	outb_p(0, (int)ch->board->port + 1);
+}
+
+/* ------------- Begin pc64xe and pcxi memory window stuff -------------- */
+
+static inline void pcxi_memwinon(struct board_info *b, unsigned int win)
+{
+               outb_p(inb((int)b->port) | FEPMEM, (int)b->port);
+}
+
+static inline void pcxi_memwinoff(struct board_info *b, unsigned int win)
+{
+	outb_p(inb((int)b->port) & ~FEPMEM, (int)b->port);
+}
+
+static inline void pcxi_globalwinon(struct channel *ch)
+{
+	outb_p(FEPMEM, (int)ch->board->port);
+}
+
+static inline void pcxi_rxwinon(struct channel *ch)
+{
+		outb_p(FEPMEM, (int)ch->board->port);
+}
+
+static inline void pcxi_txwinon(struct channel *ch)
+{
+		outb_p(FEPMEM, (int)ch->board->port);
+}
+
+static inline void pcxi_memoff(struct channel *ch)
+{
+	outb_p(0, (int)ch->board->port);
+}
+
+static inline void pcxi_assertgwinon(struct channel *ch)
+{
+	epcaassert(inb((int)ch->board->port) & FEPMEM, "Global memory off");
+}
+
+static inline void pcxi_assertmemoff(struct channel *ch)
+{
+	epcaassert(!(inb((int)ch->board->port) & FEPMEM), "Memory on");
+}
+
+
+/* ----------------------------------------------------------------------
+	Not all of the cards need specific memory windowing routines.  Some
+	cards (Such as PCI) needs no windowing routines at all.  We provide
+	these do nothing routines so that the same code base can be used.
+	The driver will ALWAYS call a windowing routine if it thinks it needs
+	to; regardless of the card.  However, dependent on the card the routine
+	may or may not do anything.
+---------------------------------------------------------------------------*/
+
+static inline void dummy_memwinon(struct board_info *b, unsigned int win)
+{
+}
+
+static inline void dummy_memwinoff(struct board_info *b, unsigned int win)
+{
+}
+
+static inline void dummy_globalwinon(struct channel *ch)
+{
+}
+
+static inline void dummy_rxwinon(struct channel *ch)
+{
+}
+
+static inline void dummy_txwinon(struct channel *ch)
+{
+}
+
+static inline void dummy_memoff(struct channel *ch)
+{
+}
+
+static inline void dummy_assertgwinon(struct channel *ch)
+{
+}
+
+static inline void dummy_assertmemoff(struct channel *ch)
+{
+}
+
+/* ----------------- Begin verifyChannel function ----------------------- */
+static inline struct channel *verifyChannel(register struct tty_struct *tty)
+{ /* Begin verifyChannel */
+
+	/* --------------------------------------------------------------------
+		This routine basically provides a sanity check.  It insures that
+		the channel returned is within the proper range of addresses as
+		well as properly initialized.  If some bogus info gets passed in
+		through tty->driver_data this should catch it.
+	--------------------------------------------------------------------- */
+
+	if (tty) 
+	{ /* Begin if tty */
+
+		register struct channel *ch = (struct channel *)tty->driver_data;
+
+		if ((ch >= &digi_channels[0]) && (ch < &digi_channels[nbdevs])) 
+		{
+			if (ch->magic == EPCA_MAGIC)
+				return ch;
+		}
+
+	} /* End if tty */
+
+	/* Else return a NULL for invalid */
+	return NULL;
+
+} /* End verifyChannel */
+
+/* ------------------ Begin pc_sched_event ------------------------- */
+
+static inline void pc_sched_event(struct channel *ch, int event)
+{ /* Begin pc_sched_event */
+
+
+	/* ----------------------------------------------------------------------
+		We call this to schedule interrupt processing on some event.  The 
+		kernel sees our request and calls the related routine in OUR driver.
+	-------------------------------------------------------------------------*/
+
+	ch->event |= 1 << event;
+	schedule_work(&ch->tqueue);
+
+
+} /* End pc_sched_event */
+
+/* ------------------ Begin epca_error ------------------------- */
+
+static void epca_error(int line, char *msg)
+{ /* Begin epca_error */
+
+	printk(KERN_ERR "epca_error (Digi): line = %d %s\n",line,msg);
+	return;
+
+} /* End epca_error */
+
+/* ------------------ Begin pc_close ------------------------- */
+static void pc_close(struct tty_struct * tty, struct file * filp)
+{ /* Begin pc_close */
+
+	struct channel *ch;
+	unsigned long flags;
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{ /* Begin if ch != NULL */
+
+		save_flags(flags);
+		cli();
+
+		if (tty_hung_up_p(filp)) 
+		{
+			restore_flags(flags);
+			return;
+		}
+
+		/* Check to see if the channel is open more than once */
+		if (ch->count-- > 1) 
+		{ /* Begin channel is open more than once */
+
+			/* -------------------------------------------------------------
+				Return without doing anything.  Someone might still be using
+				the channel.
+			---------------------------------------------------------------- */
+
+			restore_flags(flags);
+			return;
+		} /* End channel is open more than once */
+
+		/* Port open only once go ahead with shutdown & reset */
+
+		if (ch->count < 0) 
+		{
+			ch->count = 0;
+		}
+
+		/* ---------------------------------------------------------------
+			Let the rest of the driver know the channel is being closed.
+			This becomes important if an open is attempted before close 
+			is finished.
+		------------------------------------------------------------------ */
+
+		ch->asyncflags |= ASYNC_CLOSING;
+	
+		tty->closing = 1;
+
+		if (ch->asyncflags & ASYNC_INITIALIZED) 
+		{
+			/* Setup an event to indicate when the transmit buffer empties */
+			setup_empty_event(tty, ch);		
+			tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
+		}
+	
+		if (tty->driver->flush_buffer)
+			tty->driver->flush_buffer(tty);
+
+		tty_ldisc_flush(tty);
+		shutdown(ch);
+		tty->closing = 0;
+		ch->event = 0;
+		ch->tty = NULL;
+
+		if (ch->blocked_open) 
+		{ /* Begin if blocked_open */
+
+			if (ch->close_delay) 
+			{
+				msleep_interruptible(jiffies_to_msecs(ch->close_delay));
+			}
+
+			wake_up_interruptible(&ch->open_wait);
+
+		} /* End if blocked_open */
+
+		ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED | 
+		                      ASYNC_CLOSING);
+		wake_up_interruptible(&ch->close_wait);
+
+
+		restore_flags(flags);
+
+	} /* End if ch != NULL */
+
+} /* End pc_close */ 
+
+/* ------------------ Begin shutdown  ------------------------- */
+
+static void shutdown(struct channel *ch)
+{ /* Begin shutdown */
+
+	unsigned long flags;
+	struct tty_struct *tty;
+	volatile struct board_chan *bc;
+
+	if (!(ch->asyncflags & ASYNC_INITIALIZED)) 
+		return;
+
+	save_flags(flags);
+	cli();
+	globalwinon(ch);
+
+	bc = ch->brdchan;
+
+	/* ------------------------------------------------------------------
+		In order for an event to be generated on the receipt of data the
+		idata flag must be set. Since we are shutting down, this is not 
+		necessary clear this flag.
+	--------------------------------------------------------------------- */ 
+
+	if (bc)
+		bc->idata = 0;
+
+	tty = ch->tty;
+
+	/* ----------------------------------------------------------------
+	   If we're a modem control device and HUPCL is on, drop RTS & DTR.
+ 	------------------------------------------------------------------ */
+
+	if (tty->termios->c_cflag & HUPCL) 
+	{
+		ch->omodem &= ~(ch->m_rts | ch->m_dtr);
+		fepcmd(ch, SETMODEM, 0, ch->m_dtr | ch->m_rts, 10, 1);
+	}
+
+	memoff(ch);
+
+	/* ------------------------------------------------------------------
+		The channel has officialy been closed.  The next time it is opened
+		it will have to reinitialized.  Set a flag to indicate this.
+	---------------------------------------------------------------------- */
+
+	/* Prevent future Digi programmed interrupts from coming active */
+
+	ch->asyncflags &= ~ASYNC_INITIALIZED;
+	restore_flags(flags);
+
+} /* End shutdown */
+
+/* ------------------ Begin pc_hangup  ------------------------- */
+
+static void pc_hangup(struct tty_struct *tty)
+{ /* Begin pc_hangup */
+
+	struct channel *ch;
+	
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{ /* Begin if ch != NULL */
+
+		unsigned long flags;
+
+		save_flags(flags);
+		cli();
+		if (tty->driver->flush_buffer)
+			tty->driver->flush_buffer(tty);
+		tty_ldisc_flush(tty);
+		shutdown(ch);
+
+		ch->tty   = NULL;
+		ch->event = 0;
+		ch->count = 0;
+		restore_flags(flags);
+		ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED);
+		wake_up_interruptible(&ch->open_wait);
+
+	} /* End if ch != NULL */
+
+} /* End pc_hangup */
+
+/* ------------------ Begin pc_write  ------------------------- */
+
+static int pc_write(struct tty_struct * tty,
+                    const unsigned char *buf, int bytesAvailable)
+{ /* Begin pc_write */
+
+	register unsigned int head, tail;
+	register int dataLen;
+	register int size;
+	register int amountCopied;
+
+
+	struct channel *ch;
+	unsigned long flags;
+	int remain;
+	volatile struct board_chan *bc;
+
+
+	/* ----------------------------------------------------------------
+		pc_write is primarily called directly by the kernel routine
+		tty_write (Though it can also be called by put_char) found in
+		tty_io.c.  pc_write is passed a line discipline buffer where 
+		the data to be written out is stored.  The line discipline 
+		implementation itself is done at the kernel level and is not 
+		brought into the driver.  
+	------------------------------------------------------------------- */
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) == NULL)
+		return 0;
+
+	/* Make a pointer to the channel data structure found on the board. */
+
+	bc   = ch->brdchan;
+	size = ch->txbufsize;
+
+	amountCopied = 0;
+	save_flags(flags);
+	cli();
+
+	globalwinon(ch);
+
+	head = bc->tin & (size - 1);
+	tail = bc->tout;
+
+	if (tail != bc->tout)
+		tail = bc->tout;
+	tail &= (size - 1);
+
+	/*	If head >= tail, head has not wrapped around. */ 
+	if (head >= tail) 
+	{ /* Begin head has not wrapped */
+
+		/* ---------------------------------------------------------------
+			remain (much like dataLen above) represents the total amount of
+			space available on the card for data.  Here dataLen represents
+			the space existing between the head pointer and the end of 
+			buffer.  This is important because a memcpy cannot be told to
+			automatically wrap around when it hits the buffer end.
+		------------------------------------------------------------------ */ 
+
+		dataLen = size - head;
+		remain = size - (head - tail) - 1;
+
+	} /* End head has not wrapped */
+	else 
+	{ /* Begin head has wrapped around */
+
+		remain = tail - head - 1;
+		dataLen = remain;
+
+	} /* End head has wrapped around */
+
+	/* -------------------------------------------------------------------
+			Check the space on the card.  If we have more data than 
+			space; reduce the amount of data to fit the space.
+	---------------------------------------------------------------------- */
+
+	bytesAvailable = min(remain, bytesAvailable);
+
+	txwinon(ch);
+	while (bytesAvailable > 0) 
+	{ /* Begin while there is data to copy onto card */
+
+		/* -----------------------------------------------------------------
+			If head is not wrapped, the below will make sure the first 
+			data copy fills to the end of card buffer.
+		------------------------------------------------------------------- */
+
+		dataLen = min(bytesAvailable, dataLen);
+		memcpy(ch->txptr + head, buf, dataLen);
+		buf += dataLen;
+		head += dataLen;
+		amountCopied += dataLen;
+		bytesAvailable -= dataLen;
+
+		if (head >= size) 
+		{
+			head = 0;
+			dataLen = tail;
+		}
+
+	} /* End while there is data to copy onto card */
+
+	ch->statusflags |= TXBUSY;
+	globalwinon(ch);
+	bc->tin = head;
+
+	if ((ch->statusflags & LOWWAIT) == 0) 
+	{
+		ch->statusflags |= LOWWAIT;
+		bc->ilow = 1;
+	}
+	memoff(ch);
+	restore_flags(flags);
+
+	return(amountCopied);
+
+} /* End pc_write */
+
+/* ------------------ Begin pc_put_char  ------------------------- */
+
+static void pc_put_char(struct tty_struct *tty, unsigned char c)
+{ /* Begin pc_put_char */
+
+   
+	pc_write(tty, &c, 1);
+	return;
+
+} /* End pc_put_char */
+
+/* ------------------ Begin pc_write_room  ------------------------- */
+
+static int pc_write_room(struct tty_struct *tty)
+{ /* Begin pc_write_room */
+
+	int remain;
+	struct channel *ch;
+	unsigned long flags;
+	unsigned int head, tail;
+	volatile struct board_chan *bc;
+
+	remain = 0;
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{
+		save_flags(flags);
+		cli();
+		globalwinon(ch);
+
+		bc   = ch->brdchan;
+		head = bc->tin & (ch->txbufsize - 1);
+		tail = bc->tout;
+
+		if (tail != bc->tout)
+			tail = bc->tout;
+		/* Wrap tail if necessary */
+		tail &= (ch->txbufsize - 1);
+
+		if ((remain = tail - head - 1) < 0 )
+			remain += ch->txbufsize;
+
+		if (remain && (ch->statusflags & LOWWAIT) == 0) 
+		{
+			ch->statusflags |= LOWWAIT;
+			bc->ilow = 1;
+		}
+		memoff(ch);
+		restore_flags(flags);
+	}
+
+	/* Return how much room is left on card */
+	return remain;
+
+} /* End pc_write_room */
+
+/* ------------------ Begin pc_chars_in_buffer  ---------------------- */
+
+static int pc_chars_in_buffer(struct tty_struct *tty)
+{ /* Begin pc_chars_in_buffer */
+
+	int chars;
+	unsigned int ctail, head, tail;
+	int remain;
+	unsigned long flags;
+	struct channel *ch;
+	volatile struct board_chan *bc;
+
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) == NULL)
+		return(0);
+
+	save_flags(flags);
+	cli();
+	globalwinon(ch);
+
+	bc = ch->brdchan;
+	tail = bc->tout;
+	head = bc->tin;
+	ctail = ch->mailbox->cout;
+
+	if (tail == head && ch->mailbox->cin == ctail && bc->tbusy == 0)
+		chars = 0;
+	else 
+	{ /* Begin if some space on the card has been used */
+
+		head = bc->tin & (ch->txbufsize - 1);
+		tail &= (ch->txbufsize - 1);
+
+		/*  --------------------------------------------------------------
+			The logic here is basically opposite of the above pc_write_room
+			here we are finding the amount of bytes in the buffer filled.
+			Not the amount of bytes empty.
+		------------------------------------------------------------------- */
+
+		if ((remain = tail - head - 1) < 0 )
+			remain += ch->txbufsize;
+
+		chars = (int)(ch->txbufsize - remain);
+
+		/* -------------------------------------------------------------  
+			Make it possible to wakeup anything waiting for output
+			in tty_ioctl.c, etc.
+
+			If not already set.  Setup an event to indicate when the
+			transmit buffer empties 
+		----------------------------------------------------------------- */
+
+		if (!(ch->statusflags & EMPTYWAIT))
+			setup_empty_event(tty,ch);
+
+	} /* End if some space on the card has been used */
+
+	memoff(ch);
+	restore_flags(flags);
+
+	/* Return number of characters residing on card. */
+	return(chars);
+
+} /* End pc_chars_in_buffer */
+
+/* ------------------ Begin pc_flush_buffer  ---------------------- */
+
+static void pc_flush_buffer(struct tty_struct *tty)
+{ /* Begin pc_flush_buffer */
+
+	unsigned int tail;
+	unsigned long flags;
+	struct channel *ch;
+	volatile struct board_chan *bc;
+
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) == NULL)
+		return;
+
+	save_flags(flags);
+	cli();
+
+	globalwinon(ch);
+
+	bc   = ch->brdchan;
+	tail = bc->tout;
+
+	/* Have FEP move tout pointer; effectively flushing transmit buffer */
+
+	fepcmd(ch, STOUT, (unsigned) tail, 0, 0, 0);
+
+	memoff(ch);
+	restore_flags(flags);
+
+	wake_up_interruptible(&tty->write_wait);
+	tty_wakeup(tty);
+
+} /* End pc_flush_buffer */
+
+/* ------------------ Begin pc_flush_chars  ---------------------- */
+
+static void pc_flush_chars(struct tty_struct *tty)
+{ /* Begin pc_flush_chars */
+
+	struct channel * ch;
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{
+		unsigned long flags;
+
+		save_flags(flags);
+		cli();
+
+		/* ----------------------------------------------------------------
+			If not already set and the transmitter is busy setup an event
+			to indicate when the transmit empties.
+		------------------------------------------------------------------- */
+
+		if ((ch->statusflags & TXBUSY) && !(ch->statusflags & EMPTYWAIT))
+			setup_empty_event(tty,ch);
+
+		restore_flags(flags);
+	}
+
+} /* End pc_flush_chars */
+
+/* ------------------ Begin block_til_ready  ---------------------- */
+
+static int block_til_ready(struct tty_struct *tty, 
+                           struct file *filp, struct channel *ch)
+{ /* Begin block_til_ready */
+
+	DECLARE_WAITQUEUE(wait,current);
+	int	retval, do_clocal = 0;
+	unsigned long flags;
+
+
+	if (tty_hung_up_p(filp))
+	{
+		if (ch->asyncflags & ASYNC_HUP_NOTIFY)
+			retval = -EAGAIN;
+		else
+			retval = -ERESTARTSYS;	
+		return(retval);
+	}
+
+	/* ----------------------------------------------------------------- 
+		If the device is in the middle of being closed, then block
+		until it's done, and then try again.
+	-------------------------------------------------------------------- */
+	if (ch->asyncflags & ASYNC_CLOSING) 
+	{
+		interruptible_sleep_on(&ch->close_wait);
+
+		if (ch->asyncflags & ASYNC_HUP_NOTIFY)
+			return -EAGAIN;
+		else
+			return -ERESTARTSYS;
+	}
+
+	if (filp->f_flags & O_NONBLOCK) 
+	{
+		/* ----------------------------------------------------------------- 
+	  	 If non-blocking mode is set, then make the check up front
+	  	 and then exit.
+		-------------------------------------------------------------------- */
+
+		ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
+
+		return 0;
+	}
+
+
+	if (tty->termios->c_cflag & CLOCAL)
+		do_clocal = 1;
+	
+   /* Block waiting for the carrier detect and the line to become free */
+	
+	retval = 0;
+	add_wait_queue(&ch->open_wait, &wait);
+	save_flags(flags);
+	cli();
+
+
+	/* We dec count so that pc_close will know when to free things */
+	if (!tty_hung_up_p(filp))
+		ch->count--;
+
+	restore_flags(flags);
+
+	ch->blocked_open++;
+
+	while(1) 
+	{ /* Begin forever while  */
+
+		set_current_state(TASK_INTERRUPTIBLE);
+
+		if (tty_hung_up_p(filp) ||
+		    !(ch->asyncflags & ASYNC_INITIALIZED)) 
+		{
+			if (ch->asyncflags & ASYNC_HUP_NOTIFY)
+				retval = -EAGAIN;
+			else
+				retval = -ERESTARTSYS;	
+			break;
+		}
+
+		if (!(ch->asyncflags & ASYNC_CLOSING) && 
+			  (do_clocal || (ch->imodem & ch->dcd)))
+			break;
+
+		if (signal_pending(current)) 
+		{
+			retval = -ERESTARTSYS;
+			break;
+		}
+
+		/* ---------------------------------------------------------------
+			Allow someone else to be scheduled.  We will occasionally go
+			through this loop until one of the above conditions change.
+			The below schedule call will allow other processes to enter and
+			prevent this loop from hogging the cpu.
+		------------------------------------------------------------------ */
+		schedule();
+
+	} /* End forever while  */
+
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&ch->open_wait, &wait);
+	cli();
+	if (!tty_hung_up_p(filp))
+		ch->count++;
+	restore_flags(flags);
+
+	ch->blocked_open--;
+
+	if (retval)
+		return retval;
+
+	ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
+
+	return 0;
+
+} /* End block_til_ready */	
+
+/* ------------------ Begin pc_open  ---------------------- */
+
+static int pc_open(struct tty_struct *tty, struct file * filp)
+{ /* Begin pc_open */
+
+	struct channel *ch;
+	unsigned long flags;
+	int line, retval, boardnum;
+	volatile struct board_chan *bc;
+	volatile unsigned int head;
+
+	line = tty->index;
+	if (line < 0 || line >= nbdevs) 
+	{
+		printk(KERN_ERR "<Error> - pc_open : line out of range in pc_open\n");
+		tty->driver_data = NULL;
+		return(-ENODEV);
+	}
+
+
+	ch = &digi_channels[line];
+	boardnum = ch->boardnum;
+
+	/* Check status of board configured in system.  */
+
+	/* -----------------------------------------------------------------
+		I check to see if the epca_setup routine detected an user error.  
+		It might be better to put this in pc_init, but for the moment it
+		goes here.
+	---------------------------------------------------------------------- */
+
+	if (invalid_lilo_config)
+	{
+		if (setup_error_code & INVALID_BOARD_TYPE)
+			printk(KERN_ERR "<Error> - pc_open: Invalid board type specified in LILO command\n");
+
+		if (setup_error_code & INVALID_NUM_PORTS)
+			printk(KERN_ERR "<Error> - pc_open: Invalid number of ports specified in LILO command\n");
+
+		if (setup_error_code & INVALID_MEM_BASE)
+			printk(KERN_ERR "<Error> - pc_open: Invalid board memory address specified in LILO command\n");
+
+		if (setup_error_code & INVALID_PORT_BASE)
+			printk(KERN_ERR "<Error> - pc_open: Invalid board port address specified in LILO command\n");
+
+		if (setup_error_code & INVALID_BOARD_STATUS)
+			printk(KERN_ERR "<Error> - pc_open: Invalid board status specified in LILO command\n");
+
+		if (setup_error_code & INVALID_ALTPIN)
+			printk(KERN_ERR "<Error> - pc_open: Invalid board altpin specified in LILO command\n");
+
+		tty->driver_data = NULL;   /* Mark this device as 'down' */
+		return(-ENODEV);
+	}
+
+	if ((boardnum >= num_cards) || (boards[boardnum].status == DISABLED)) 
+	{
+		tty->driver_data = NULL;   /* Mark this device as 'down' */
+		return(-ENODEV);
+	}
+	
+	if (( bc = ch->brdchan) == 0) 
+	{
+		tty->driver_data = NULL;
+		return(-ENODEV);
+	}
+
+	/* ------------------------------------------------------------------
+		Every time a channel is opened, increment a counter.  This is 
+		necessary because we do not wish to flush and shutdown the channel
+		until the last app holding the channel open, closes it.	 	
+	--------------------------------------------------------------------- */
+
+	ch->count++;
+
+	/* ----------------------------------------------------------------
+		Set a kernel structures pointer to our local channel 
+		structure.  This way we can get to it when passed only
+		a tty struct.
+	------------------------------------------------------------------ */
+
+	tty->driver_data = ch;
+	
+	/* ----------------------------------------------------------------
+		If this is the first time the channel has been opened, initialize
+		the tty->termios struct otherwise let pc_close handle it.
+	-------------------------------------------------------------------- */
+
+	save_flags(flags);
+	cli();
+
+	globalwinon(ch);
+	ch->statusflags = 0;
+
+	/* Save boards current modem status */
+	ch->imodem = bc->mstat;
+
+	/* ----------------------------------------------------------------
+	   Set receive head and tail ptrs to each other.  This indicates
+	   no data available to read.
+	----------------------------------------------------------------- */
+	head = bc->rin;
+	bc->rout = head;
+
+	/* Set the channels associated tty structure */
+	ch->tty = tty;
+
+	/* -----------------------------------------------------------------
+		The below routine generally sets up parity, baud, flow control 
+		issues, etc.... It effect both control flags and input flags.
+	-------------------------------------------------------------------- */
+	epcaparam(tty,ch);
+
+	ch->asyncflags |= ASYNC_INITIALIZED;
+	memoff(ch);
+
+	restore_flags(flags);
+
+	retval = block_til_ready(tty, filp, ch);
+	if (retval)
+	{
+		return retval;
+	}
+
+	/* -------------------------------------------------------------
+		Set this again in case a hangup set it to zero while this 
+		open() was waiting for the line...
+	--------------------------------------------------------------- */
+	ch->tty = tty;
+
+	save_flags(flags);
+	cli();
+	globalwinon(ch);
+
+	/* Enable Digi Data events */
+	bc->idata = 1;
+
+	memoff(ch);
+	restore_flags(flags);
+
+	return 0;
+
+} /* End pc_open */
+
+#ifdef MODULE
+static int __init epca_module_init(void)
+{ /* Begin init_module */
+
+	unsigned long	flags;
+
+	save_flags(flags);
+	cli();
+
+	pc_init();
+
+	restore_flags(flags);
+
+	return(0);
+}
+
+module_init(epca_module_init);
+#endif
+
+#ifdef ENABLE_PCI
+static struct pci_driver epca_driver;
+#endif
+
+#ifdef MODULE
+/* -------------------- Begin cleanup_module  ---------------------- */
+
+static void __exit epca_module_exit(void)
+{
+
+	int               count, crd;
+	struct board_info *bd;
+	struct channel    *ch;
+	unsigned long     flags;
+
+	del_timer_sync(&epca_timer);
+
+	save_flags(flags);
+	cli();
+
+	if ((tty_unregister_driver(pc_driver)) ||  
+	    (tty_unregister_driver(pc_info)))
+	{
+		printk(KERN_WARNING "<Error> - DIGI : cleanup_module failed to un-register tty driver\n");
+		restore_flags(flags);
+		return;
+	}
+	put_tty_driver(pc_driver);
+	put_tty_driver(pc_info);
+
+	for (crd = 0; crd < num_cards; crd++) 
+	{ /* Begin for each card */
+
+		bd = &boards[crd];
+
+		if (!bd)
+		{ /* Begin sanity check */
+			printk(KERN_ERR "<Error> - Digi : cleanup_module failed\n");
+			return;
+		} /* End sanity check */
+
+		ch = card_ptr[crd]; 
+
+		for (count = 0; count < bd->numports; count++, ch++) 
+		{ /* Begin for each port */
+
+			if (ch) 
+			{
+				if (ch->tty)
+					tty_hangup(ch->tty);
+				kfree(ch->tmp_buf);
+			}
+
+		} /* End for each port */
+	} /* End for each card */
+
+#ifdef ENABLE_PCI
+	pci_unregister_driver (&epca_driver);
+#endif
+
+	restore_flags(flags);
+
+}
+module_exit(epca_module_exit);
+#endif /* MODULE */
+
+static struct tty_operations pc_ops = {
+	.open = pc_open,
+	.close = pc_close,
+	.write = pc_write,
+	.write_room = pc_write_room,
+	.flush_buffer = pc_flush_buffer,
+	.chars_in_buffer = pc_chars_in_buffer,
+	.flush_chars = pc_flush_chars,
+	.put_char = pc_put_char,
+	.ioctl = pc_ioctl,
+	.set_termios = pc_set_termios,
+	.stop = pc_stop,
+	.start = pc_start,
+	.throttle = pc_throttle,
+	.unthrottle = pc_unthrottle,
+	.hangup = pc_hangup,
+};
+
+static int info_open(struct tty_struct *tty, struct file * filp)
+{
+	return 0;
+}
+
+static struct tty_operations info_ops = {
+	.open = info_open,
+	.ioctl = info_ioctl,
+};
+
+/* ------------------ Begin pc_init  ---------------------- */
+
+int __init pc_init(void)
+{ /* Begin pc_init */
+
+	/* ----------------------------------------------------------------
+		pc_init is called by the operating system during boot up prior to
+		any open calls being made.  In the older versions of Linux (Prior
+		to 2.0.0) an entry is made into tty_io.c.  A pointer to the last
+		memory location (from kernel space) used (kmem_start) is passed
+		to pc_init.  It is pc_inits responsibility to modify this value 
+		for any memory that the Digi driver might need and then return
+		this value to the operating system.  For example if the driver
+		wishes to allocate 1K of kernel memory, pc_init would return 
+		(kmem_start + 1024).  This memory (Between kmem_start and kmem_start
+		+ 1024) would then be available for use exclusively by the driver.  
+		In this case our driver does not allocate any of this kernel 
+		memory.
+	------------------------------------------------------------------*/
+
+	ulong flags;
+	int crd;
+	struct board_info *bd;
+	unsigned char board_id = 0;
+
+#ifdef ENABLE_PCI
+	int pci_boards_found, pci_count;
+
+	pci_count = 0;
+#endif /* ENABLE_PCI */
+
+	pc_driver = alloc_tty_driver(MAX_ALLOC);
+	if (!pc_driver)
+		return -ENOMEM;
+
+	pc_info = alloc_tty_driver(MAX_ALLOC);
+	if (!pc_info) {
+		put_tty_driver(pc_driver);
+		return -ENOMEM;
+	}
+
+	/* -----------------------------------------------------------------------
+		If epca_setup has not been ran by LILO set num_cards to defaults; copy
+		board structure defined by digiConfig into drivers board structure.
+		Note : If LILO has ran epca_setup then epca_setup will handle defining
+		num_cards as well as copying the data into the board structure.
+	-------------------------------------------------------------------------- */
+	if (!liloconfig)
+	{ /* Begin driver has been configured via. epcaconfig */
+
+		nbdevs = NBDEVS;
+		num_cards = NUMCARDS;
+		memcpy((void *)&boards, (void *)&static_boards,
+		       (sizeof(struct board_info) * NUMCARDS));
+	} /* End driver has been configured via. epcaconfig */
+
+	/* -----------------------------------------------------------------
+		Note : If lilo was used to configure the driver and the 
+		ignore epcaconfig option was choosen (digiepca=2) then 
+		nbdevs and num_cards will equal 0 at this point.  This is
+		okay; PCI cards will still be picked up if detected.
+	--------------------------------------------------------------------- */
+
+	/*  -----------------------------------------------------------
+		Set up interrupt, we will worry about memory allocation in
+		post_fep_init. 
+	--------------------------------------------------------------- */
+
+
+	printk(KERN_INFO "DIGI epca driver version %s loaded.\n",VERSION);
+
+#ifdef ENABLE_PCI
+
+	/* ------------------------------------------------------------------
+		NOTE : This code assumes that the number of ports found in 
+		       the boards array is correct.  This could be wrong if
+		       the card in question is PCI (And therefore has no ports 
+		       entry in the boards structure.)  The rest of the 
+		       information will be valid for PCI because the beginning
+		       of pc_init scans for PCI and determines i/o and base
+		       memory addresses.  I am not sure if it is possible to 
+		       read the number of ports supported by the card prior to
+		       it being booted (Since that is the state it is in when 
+		       pc_init is run).  Because it is not possible to query the
+		       number of supported ports until after the card has booted;
+		       we are required to calculate the card_ptrs as the card is	 
+		       is initialized (Inside post_fep_init).  The negative thing
+		       about this approach is that digiDload's call to GET_INFO
+		       will have a bad port value.  (Since this is called prior
+		       to post_fep_init.)
+
+	--------------------------------------------------------------------- */
+  
+	pci_boards_found = 0;
+	if(num_cards < MAXBOARDS)
+		pci_boards_found += init_PCI();
+	num_cards += pci_boards_found;
+
+#endif /* ENABLE_PCI */
+
+	pc_driver->owner = THIS_MODULE;
+	pc_driver->name = "ttyD"; 
+	pc_driver->devfs_name = "tts/D";
+	pc_driver->major = DIGI_MAJOR; 
+	pc_driver->minor_start = 0;
+	pc_driver->type = TTY_DRIVER_TYPE_SERIAL;
+	pc_driver->subtype = SERIAL_TYPE_NORMAL;
+	pc_driver->init_termios = tty_std_termios;
+	pc_driver->init_termios.c_iflag = 0;
+	pc_driver->init_termios.c_oflag = 0;
+	pc_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
+	pc_driver->init_termios.c_lflag = 0;
+	pc_driver->flags = TTY_DRIVER_REAL_RAW;
+	tty_set_operations(pc_driver, &pc_ops);
+
+	pc_info->owner = THIS_MODULE;
+	pc_info->name = "digi_ctl";
+	pc_info->major = DIGIINFOMAJOR;
+	pc_info->minor_start = 0;
+	pc_info->type = TTY_DRIVER_TYPE_SERIAL;
+	pc_info->subtype = SERIAL_TYPE_INFO;
+	pc_info->init_termios = tty_std_termios;
+	pc_info->init_termios.c_iflag = 0;
+	pc_info->init_termios.c_oflag = 0;
+	pc_info->init_termios.c_lflag = 0;
+	pc_info->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
+	pc_info->flags = TTY_DRIVER_REAL_RAW;
+	tty_set_operations(pc_info, &info_ops);
+
+
+	save_flags(flags);
+	cli();
+
+	for (crd = 0; crd < num_cards; crd++) 
+	{ /* Begin for each card */
+
+		/*  ------------------------------------------------------------------
+			This is where the appropriate memory handlers for the hardware is
+			set.  Everything at runtime blindly jumps through these vectors.
+		---------------------------------------------------------------------- */
+
+		/* defined in epcaconfig.h */
+		bd = &boards[crd];
+
+		switch (bd->type)
+		{ /* Begin switch on bd->type {board type} */
+			case PCXEM:
+			case EISAXEM:
+				bd->memwinon     = pcxem_memwinon ;
+				bd->memwinoff    = pcxem_memwinoff ;
+				bd->globalwinon  = pcxem_globalwinon ;
+				bd->txwinon      = pcxem_txwinon ;
+				bd->rxwinon      = pcxem_rxwinon ;
+				bd->memoff       = pcxem_memoff ;
+				bd->assertgwinon = dummy_assertgwinon;
+				bd->assertmemoff = dummy_assertmemoff;
+				break;
+
+			case PCIXEM:
+			case PCIXRJ:
+			case PCIXR:
+				bd->memwinon     = dummy_memwinon;
+				bd->memwinoff    = dummy_memwinoff;
+				bd->globalwinon  = dummy_globalwinon;
+				bd->txwinon      = dummy_txwinon;
+				bd->rxwinon      = dummy_rxwinon;
+				bd->memoff       = dummy_memoff;
+				bd->assertgwinon = dummy_assertgwinon;
+				bd->assertmemoff = dummy_assertmemoff;
+				break;
+
+			case PCXE:
+			case PCXEVE:
+
+				bd->memwinon     = pcxe_memwinon;
+				bd->memwinoff    = pcxe_memwinoff;
+				bd->globalwinon  = pcxe_globalwinon;
+				bd->txwinon      = pcxe_txwinon;
+				bd->rxwinon      = pcxe_rxwinon;
+				bd->memoff       = pcxe_memoff;
+				bd->assertgwinon = dummy_assertgwinon;
+				bd->assertmemoff = dummy_assertmemoff;
+				break;
+
+			case PCXI:
+			case PC64XE:
+
+				bd->memwinon     = pcxi_memwinon;
+				bd->memwinoff    = pcxi_memwinoff;
+				bd->globalwinon  = pcxi_globalwinon;
+				bd->txwinon      = pcxi_txwinon;
+				bd->rxwinon      = pcxi_rxwinon;
+				bd->memoff       = pcxi_memoff;
+				bd->assertgwinon = pcxi_assertgwinon;
+				bd->assertmemoff = pcxi_assertmemoff;
+				break;
+
+			default:
+				break;
+
+		} /* End switch on bd->type */
+
+		/* ---------------------------------------------------------------
+			Some cards need a memory segment to be defined for use in 
+			transmit and receive windowing operations.  These boards
+			are listed in the below switch.  In the case of the XI the
+			amount of memory on the board is variable so the memory_seg
+			is also variable.  This code determines what they segment 
+			should be.
+		----------------------------------------------------------------- */
+
+		switch (bd->type)
+		{ /* Begin switch on bd->type {board type} */
+
+			case PCXE:
+			case PCXEVE:
+			case PC64XE:
+				bd->memory_seg = 0xf000;
+			break;
+
+			case PCXI:
+				board_id = inb((int)bd->port);
+				if ((board_id & 0x1) == 0x1) 
+				{ /* Begin it's an XI card */ 
+
+					/* Is it a 64K board */
+					if ((board_id & 0x30) == 0) 
+						bd->memory_seg = 0xf000;
+
+					/* Is it a 128K board */
+					if ((board_id & 0x30) == 0x10) 
+						bd->memory_seg = 0xe000;
+
+					/* Is is a 256K board */	
+					if ((board_id & 0x30) == 0x20) 
+						bd->memory_seg = 0xc000;
+
+					/* Is it a 512K board */
+					if ((board_id & 0x30) == 0x30) 
+						bd->memory_seg = 0x8000;
+
+				} /* End it is an XI card */
+				else
+				{
+					printk(KERN_ERR "<Error> - Board at 0x%x doesn't appear to be an XI\n",(int)bd->port);
+				}
+			break;
+
+		} /* End switch on bd->type */
+
+	} /* End for each card */
+
+	if (tty_register_driver(pc_driver))
+		panic("Couldn't register Digi PC/ driver");
+
+	if (tty_register_driver(pc_info))
+		panic("Couldn't register Digi PC/ info ");
+
+	/* -------------------------------------------------------------------
+	   Start up the poller to check for events on all enabled boards
+	---------------------------------------------------------------------- */
+
+	init_timer(&epca_timer);
+	epca_timer.function = epcapoll;
+	mod_timer(&epca_timer, jiffies + HZ/25);
+
+	restore_flags(flags);
+
+	return 0;
+
+} /* End pc_init */
+
+/* ------------------ Begin post_fep_init  ---------------------- */
+
+static void post_fep_init(unsigned int crd)
+{ /* Begin post_fep_init */
+
+	int i;
+	unchar *memaddr;
+	volatile struct global_data *gd;
+	struct board_info *bd;
+	volatile struct board_chan *bc;
+	struct channel *ch; 
+	int shrinkmem = 0, lowwater ; 
+ 
+	/*  -------------------------------------------------------------
+		This call is made by the user via. the ioctl call DIGI_INIT.
+		It is responsible for setting up all the card specific stuff.
+	---------------------------------------------------------------- */
+	bd = &boards[crd];
+
+	/* -----------------------------------------------------------------
+		If this is a PCI board, get the port info.  Remember PCI cards
+		do not have entries into the epcaconfig.h file, so we can't get 
+		the number of ports from it.  Unfortunetly, this means that anyone
+		doing a DIGI_GETINFO before the board has booted will get an invalid
+		number of ports returned (It should return 0).  Calls to DIGI_GETINFO
+		after DIGI_INIT has been called will return the proper values. 
+	------------------------------------------------------------------- */
+
+	if (bd->type >= PCIXEM) /* If the board in question is PCI */
+	{ /* Begin get PCI number of ports */
+
+		/* --------------------------------------------------------------------
+			Below we use XEMPORTS as a memory offset regardless of which PCI
+			card it is.  This is because all of the supported PCI cards have
+			the same memory offset for the channel data.  This will have to be
+			changed if we ever develop a PCI/XE card.  NOTE : The FEP manual
+			states that the port offset is 0xC22 as opposed to 0xC02.  This is
+			only true for PC/XE, and PC/XI cards; not for the XEM, or CX series.
+			On the PCI cards the number of ports is determined by reading a 
+			ID PROM located in the box attached to the card.  The card can then
+			determine the index the id to determine the number of ports available.
+			(FYI - The id should be located at 0x1ac (And may use up to 4 bytes
+			if the box in question is a XEM or CX)).  
+		------------------------------------------------------------------------ */ 
+
+		bd->numports = (unsigned short)*(unsigned char *)bus_to_virt((unsigned long)
+                                                       (bd->re_map_membase + XEMPORTS));
+
+		
+		epcaassert(bd->numports <= 64,"PCI returned a invalid number of ports");
+		nbdevs += (bd->numports);
+
+	} /* End get PCI number of ports */
+
+	if (crd != 0)
+		card_ptr[crd] = card_ptr[crd-1] + boards[crd-1].numports;
+	else
+		card_ptr[crd] = &digi_channels[crd]; /* <- For card 0 only */
+
+	ch = card_ptr[crd];
+
+
+	epcaassert(ch <= &digi_channels[nbdevs - 1], "ch out of range");
+
+	memaddr = (unchar *)bd->re_map_membase;
+
+	/* 
+	   The below command is necessary because newer kernels (2.1.x and
+	   up) do not have a 1:1 virtual to physical mapping.  The below
+	   call adjust for that.
+	*/
+
+	memaddr = (unsigned char *)bus_to_virt((unsigned long)memaddr);
+
+	/* -----------------------------------------------------------------
+		The below assignment will set bc to point at the BEGINING of
+		the cards channel structures.  For 1 card there will be between
+		8 and 64 of these structures.
+	-------------------------------------------------------------------- */
+
+	bc = (volatile struct board_chan *)((ulong)memaddr + CHANSTRUCT);
+
+	/* -------------------------------------------------------------------
+		The below assignment will set gd to point at the BEGINING of
+		global memory address 0xc00.  The first data in that global
+		memory actually starts at address 0xc1a.  The command in 
+		pointer begins at 0xd10.
+	---------------------------------------------------------------------- */
+
+	gd = (volatile struct global_data *)((ulong)memaddr + GLOBAL);
+
+	/* --------------------------------------------------------------------
+		XEPORTS (address 0xc22) points at the number of channels the
+		card supports. (For 64XE, XI, XEM, and XR use 0xc02)
+	----------------------------------------------------------------------- */
+
+	if (((bd->type == PCXEVE) | (bd->type == PCXE)) &&
+	    (*(ushort *)((ulong)memaddr + XEPORTS) < 3))
+		shrinkmem = 1;
+	if (bd->type < PCIXEM)
+		if (!request_region((int)bd->port, 4, board_desc[bd->type]))
+			return;		
+
+	memwinon(bd, 0);
+
+	/*  --------------------------------------------------------------------
+		Remember ch is the main drivers channels structure, while bc is 
+	   the cards channel structure.
+	------------------------------------------------------------------------ */
+
+	/* For every port on the card do ..... */
+
+	for (i = 0; i < bd->numports; i++, ch++, bc++) 
+	{ /* Begin for each port */
+
+		ch->brdchan        = bc;
+		ch->mailbox        = gd; 
+		INIT_WORK(&ch->tqueue, do_softint, ch);
+		ch->board          = &boards[crd];
+
+		switch (bd->type)
+		{ /* Begin switch bd->type */
+
+			/* ----------------------------------------------------------------
+				Since some of the boards use different bitmaps for their
+				control signals we cannot hard code these values and retain
+				portability.  We virtualize this data here.
+			------------------------------------------------------------------- */
+			case EISAXEM:
+			case PCXEM:
+			case PCIXEM:
+			case PCIXRJ:
+			case PCIXR:
+				ch->m_rts = 0x02 ;
+				ch->m_dcd = 0x80 ; 
+				ch->m_dsr = 0x20 ;
+				ch->m_cts = 0x10 ;
+				ch->m_ri  = 0x40 ;
+				ch->m_dtr = 0x01 ;
+				break;
+
+			case PCXE:
+			case PCXEVE:
+			case PCXI:
+			case PC64XE:
+				ch->m_rts = 0x02 ;
+				ch->m_dcd = 0x08 ; 
+				ch->m_dsr = 0x10 ;
+				ch->m_cts = 0x20 ;
+				ch->m_ri  = 0x40 ;
+				ch->m_dtr = 0x80 ;
+				break;
+	
+		} /* End switch bd->type */
+
+		if (boards[crd].altpin) 
+		{
+			ch->dsr = ch->m_dcd;
+			ch->dcd = ch->m_dsr;
+			ch->digiext.digi_flags |= DIGI_ALTPIN;
+		}
+		else 
+		{ 
+			ch->dcd = ch->m_dcd;
+			ch->dsr = ch->m_dsr;
+		}
+	
+		ch->boardnum   = crd;
+		ch->channelnum = i;
+		ch->magic      = EPCA_MAGIC;
+		ch->tty        = NULL;
+
+		if (shrinkmem) 
+		{
+			fepcmd(ch, SETBUFFER, 32, 0, 0, 0);
+			shrinkmem = 0;
+		}
+
+		switch (bd->type)
+		{ /* Begin switch bd->type */
+
+			case PCIXEM:
+			case PCIXRJ:
+			case PCIXR:
+				/* Cover all the 2MEG cards */
+				ch->txptr = memaddr + (((bc->tseg) << 4) & 0x1fffff);
+				ch->rxptr = memaddr + (((bc->rseg) << 4) & 0x1fffff);
+				ch->txwin = FEPWIN | ((bc->tseg) >> 11);
+				ch->rxwin = FEPWIN | ((bc->rseg) >> 11);
+				break;
+
+			case PCXEM:
+			case EISAXEM:
+				/* Cover all the 32K windowed cards */
+				/* Mask equal to window size - 1 */
+				ch->txptr = memaddr + (((bc->tseg) << 4) & 0x7fff);
+				ch->rxptr = memaddr + (((bc->rseg) << 4) & 0x7fff);
+				ch->txwin = FEPWIN | ((bc->tseg) >> 11);
+				ch->rxwin = FEPWIN | ((bc->rseg) >> 11);
+				break;
+
+			case PCXEVE:
+			case PCXE:
+				ch->txptr = memaddr + (((bc->tseg - bd->memory_seg) << 4) & 0x1fff);
+				ch->txwin = FEPWIN | ((bc->tseg - bd->memory_seg) >> 9);
+				ch->rxptr = memaddr + (((bc->rseg - bd->memory_seg) << 4) & 0x1fff);
+				ch->rxwin = FEPWIN | ((bc->rseg - bd->memory_seg) >>9 );
+				break;
+
+			case PCXI:
+			case PC64XE:
+				ch->txptr = memaddr + ((bc->tseg - bd->memory_seg) << 4);
+				ch->rxptr = memaddr + ((bc->rseg - bd->memory_seg) << 4);
+				ch->txwin = ch->rxwin = 0;
+				break;
+
+		} /* End switch bd->type */
+
+		ch->txbufhead = 0;
+		ch->txbufsize = bc->tmax + 1;
+	
+		ch->rxbufhead = 0;
+		ch->rxbufsize = bc->rmax + 1;
+	
+		lowwater = ch->txbufsize >= 2000 ? 1024 : (ch->txbufsize / 2);
+
+		/* Set transmitter low water mark */
+		fepcmd(ch, STXLWATER, lowwater, 0, 10, 0);
+
+		/* Set receiver low water mark */
+
+		fepcmd(ch, SRXLWATER, (ch->rxbufsize / 4), 0, 10, 0);
+
+		/* Set receiver high water mark */
+
+		fepcmd(ch, SRXHWATER, (3 * ch->rxbufsize / 4), 0, 10, 0);
+
+		bc->edelay = 100;
+		bc->idata = 1;
+	
+		ch->startc  = bc->startc;
+		ch->stopc   = bc->stopc;
+		ch->startca = bc->startca;
+		ch->stopca  = bc->stopca;
+	
+		ch->fepcflag = 0;
+		ch->fepiflag = 0;
+		ch->fepoflag = 0;
+		ch->fepstartc = 0;
+		ch->fepstopc = 0;
+		ch->fepstartca = 0;
+		ch->fepstopca = 0;
+	
+		ch->close_delay = 50;
+		ch->count = 0;
+		ch->blocked_open = 0;
+		init_waitqueue_head(&ch->open_wait);
+		init_waitqueue_head(&ch->close_wait);
+		ch->tmp_buf = kmalloc(ch->txbufsize,GFP_KERNEL);
+		if (!(ch->tmp_buf))
+		{
+			printk(KERN_ERR "POST FEP INIT : kmalloc failed for port 0x%x\n",i);
+			release_region((int)bd->port, 4);
+			while(i-- > 0)
+				kfree((ch--)->tmp_buf);
+			return;
+		}
+		else 
+			memset((void *)ch->tmp_buf,0,ch->txbufsize);
+	} /* End for each port */
+
+	printk(KERN_INFO 
+	        "Digi PC/Xx Driver V%s:  %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n", 
+	        VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports);
+	sprintf(mesg, 
+	        "Digi PC/Xx Driver V%s:  %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n", 
+	        VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports);
+	console_print(mesg);
+
+	memwinoff(bd, 0);
+
+} /* End post_fep_init */
+
+/* --------------------- Begin epcapoll  ------------------------ */
+
+static void epcapoll(unsigned long ignored)
+{ /* Begin epcapoll */
+
+	unsigned long flags;
+	int crd;
+	volatile unsigned int head, tail;
+	struct channel *ch;
+	struct board_info *bd;
+
+	/* -------------------------------------------------------------------
+		This routine is called upon every timer interrupt.  Even though
+		the Digi series cards are capable of generating interrupts this 
+		method of non-looping polling is more efficient.  This routine
+		checks for card generated events (Such as receive data, are transmit
+		buffer empty) and acts on those events.
+	----------------------------------------------------------------------- */
+	
+	save_flags(flags);
+	cli();
+
+	for (crd = 0; crd < num_cards; crd++) 
+	{ /* Begin for each card */
+
+		bd = &boards[crd];
+		ch = card_ptr[crd];
+
+		if ((bd->status == DISABLED) || digi_poller_inhibited)
+			continue; /* Begin loop next interation */
+
+		/* -----------------------------------------------------------
+			assertmemoff is not needed here; indeed it is an empty subroutine.
+			It is being kept because future boards may need this as well as
+			some legacy boards.
+		---------------------------------------------------------------- */
+
+		assertmemoff(ch);
+
+		globalwinon(ch);
+
+		/* ---------------------------------------------------------------
+			In this case head and tail actually refer to the event queue not
+			the transmit or receive queue.
+		------------------------------------------------------------------- */
+
+		head = ch->mailbox->ein;
+		tail = ch->mailbox->eout;
+		
+		/* If head isn't equal to tail we have an event */
+
+		if (head != tail)
+			doevent(crd);
+
+		memoff(ch);
+
+	} /* End for each card */
+
+	mod_timer(&epca_timer, jiffies + (HZ / 25));
+
+	restore_flags(flags);
+} /* End epcapoll */
+
+/* --------------------- Begin doevent  ------------------------ */
+
+static void doevent(int crd)
+{ /* Begin doevent */
+
+	volatile unchar *eventbuf;
+	struct channel *ch, *chan0;
+	static struct tty_struct *tty;
+	volatile struct board_info *bd;
+	volatile struct board_chan *bc;
+	register volatile unsigned int tail, head;
+	register int event, channel;
+	register int mstat, lstat;
+
+	/* -------------------------------------------------------------------
+		This subroutine is called by epcapoll when an event is detected 
+		in the event queue.  This routine responds to those events.
+	--------------------------------------------------------------------- */
+
+	bd = &boards[crd];
+
+	chan0 = card_ptr[crd];
+	epcaassert(chan0 <= &digi_channels[nbdevs - 1], "ch out of range");
+
+	assertgwinon(chan0);
+
+	while ((tail = chan0->mailbox->eout) != (head = chan0->mailbox->ein)) 
+	{ /* Begin while something in event queue */
+
+		assertgwinon(chan0);
+
+		eventbuf = (volatile unchar *)bus_to_virt((ulong)(bd->re_map_membase + tail + ISTART));
+
+		/* Get the channel the event occurred on */
+		channel = eventbuf[0];
+
+		/* Get the actual event code that occurred */
+		event = eventbuf[1];
+
+		/*  ----------------------------------------------------------------
+			The two assignments below get the current modem status (mstat)
+			and the previous modem status (lstat).  These are useful becuase
+			an event could signal a change in modem signals itself.
+		------------------------------------------------------------------- */
+
+		mstat = eventbuf[2];
+		lstat = eventbuf[3];
+
+		ch = chan0 + channel;
+
+		if ((unsigned)channel >= bd->numports || !ch) 
+		{ 
+			if (channel >= bd->numports)
+				ch = chan0;
+			bc = ch->brdchan;
+			goto next;
+		}
+
+		if ((bc = ch->brdchan) == NULL)
+			goto next;
+
+		if (event & DATA_IND) 
+		{ /* Begin DATA_IND */
+
+			receive_data(ch);
+			assertgwinon(ch);
+
+		} /* End DATA_IND */
+		/* else *//* Fix for DCD transition missed bug */
+		if (event & MODEMCHG_IND) 
+		{ /* Begin MODEMCHG_IND */
+
+			/* A modem signal change has been indicated */
+
+			ch->imodem = mstat;
+
+			if (ch->asyncflags & ASYNC_CHECK_CD) 
+			{
+				if (mstat & ch->dcd)  /* We are now receiving dcd */
+					wake_up_interruptible(&ch->open_wait);
+				else
+					pc_sched_event(ch, EPCA_EVENT_HANGUP); /* No dcd; hangup */
+			}
+
+		} /* End MODEMCHG_IND */
+
+		tty = ch->tty;
+		if (tty) 
+		{ /* Begin if valid tty */
+
+			if (event & BREAK_IND) 
+			{ /* Begin if BREAK_IND */
+
+				/* A break has been indicated */
+
+				tty->flip.count++;
+				*tty->flip.flag_buf_ptr++ = TTY_BREAK;
+
+				*tty->flip.char_buf_ptr++ = 0;
+
+				tty_schedule_flip(tty); 
+
+			} /* End if BREAK_IND */
+			else
+			if (event & LOWTX_IND) 
+			{ /* Begin LOWTX_IND */
+
+				if (ch->statusflags & LOWWAIT) 
+				{ /* Begin if LOWWAIT */
+
+					ch->statusflags &= ~LOWWAIT;
+					tty_wakeup(tty);
+					wake_up_interruptible(&tty->write_wait);
+
+				} /* End if LOWWAIT */
+
+			} /* End LOWTX_IND */
+			else
+			if (event & EMPTYTX_IND) 
+			{ /* Begin EMPTYTX_IND */
+
+				/* This event is generated by setup_empty_event */
+
+				ch->statusflags &= ~TXBUSY;
+				if (ch->statusflags & EMPTYWAIT) 
+				{ /* Begin if EMPTYWAIT */
+
+					ch->statusflags &= ~EMPTYWAIT;
+					tty_wakeup(tty);
+
+					wake_up_interruptible(&tty->write_wait);
+
+				} /* End if EMPTYWAIT */
+
+			} /* End EMPTYTX_IND */
+
+		} /* End if valid tty */
+
+
+	next:
+		globalwinon(ch);
+
+		if (!bc)
+			printk(KERN_ERR "<Error> - bc == NULL in doevent!\n");
+		else 
+			bc->idata = 1;
+
+		chan0->mailbox->eout = (tail + 4) & (IMAX - ISTART - 4);
+		globalwinon(chan0);
+
+	} /* End while something in event queue */
+
+} /* End doevent */
+
+/* --------------------- Begin fepcmd  ------------------------ */
+
+static void fepcmd(struct channel *ch, int cmd, int word_or_byte,
+                   int byte2, int ncmds, int bytecmd)
+{ /* Begin fepcmd */
+
+	unchar *memaddr;
+	unsigned int head, cmdTail, cmdStart, cmdMax;
+	long count;
+	int n;
+
+	/* This is the routine in which commands may be passed to the card. */
+
+	if (ch->board->status == DISABLED)
+	{
+		return;
+	}
+
+	assertgwinon(ch);
+
+	/* Remember head (As well as max) is just an offset not a base addr */
+	head = ch->mailbox->cin;
+
+	/* cmdStart is a base address */
+	cmdStart = ch->mailbox->cstart;
+
+	/* ------------------------------------------------------------------
+		We do the addition below because we do not want a max pointer 
+		relative to cmdStart.  We want a max pointer that points at the 
+		physical end of the command queue.
+	-------------------------------------------------------------------- */
+
+	cmdMax = (cmdStart + 4 + (ch->mailbox->cmax));
+
+	memaddr = ch->board->re_map_membase;
+
+	/* 
+	   The below command is necessary because newer kernels (2.1.x and
+	   up) do not have a 1:1 virtual to physical mapping.  The below
+	   call adjust for that.
+	*/
+
+	memaddr = (unsigned char *)bus_to_virt((unsigned long)memaddr);
+
+	if (head >= (cmdMax - cmdStart) || (head & 03)) 
+	{
+		printk(KERN_ERR "line %d: Out of range, cmd = %x, head = %x\n", __LINE__, 
+              cmd, head);
+		printk(KERN_ERR "line %d: Out of range, cmdMax = %x, cmdStart = %x\n", __LINE__, 
+              cmdMax, cmdStart);
+		return;
+	}
+
+	if (bytecmd) 
+	{
+		*(volatile unchar *)(memaddr + head + cmdStart + 0) = (unchar)cmd;
+
+		*(volatile unchar *)(memaddr + head + cmdStart + 1) = (unchar)ch->channelnum;
+		/* Below word_or_byte is bits to set */
+		*(volatile unchar *)(memaddr + head + cmdStart + 2) = (unchar)word_or_byte;
+		/* Below byte2 is bits to reset */
+		*(volatile unchar *)(memaddr + head + cmdStart + 3) = (unchar)byte2;
+
+	} 
+	else 
+	{
+		*(volatile unchar *)(memaddr + head + cmdStart + 0) = (unchar)cmd;
+		*(volatile unchar *)(memaddr + head + cmdStart + 1) = (unchar)ch->channelnum;
+		*(volatile ushort*)(memaddr + head + cmdStart + 2) = (ushort)word_or_byte;
+	}
+
+	head = (head + 4) & (cmdMax - cmdStart - 4);
+	ch->mailbox->cin = head;
+
+	count = FEPTIMEOUT;
+
+	for (;;) 
+	{ /* Begin forever loop */
+
+		count--;
+		if (count == 0) 
+		{
+			printk(KERN_ERR "<Error> - Fep not responding in fepcmd()\n");
+			return;
+		}
+
+		head = ch->mailbox->cin;
+		cmdTail = ch->mailbox->cout;
+
+		n = (head - cmdTail) & (cmdMax - cmdStart - 4);
+
+		/* ----------------------------------------------------------
+			Basically this will break when the FEP acknowledges the 
+			command by incrementing cmdTail (Making it equal to head).
+		------------------------------------------------------------- */
+
+		if (n <= ncmds * (sizeof(short) * 4))
+			break; /* Well nearly forever :-) */
+
+	} /* End forever loop */
+
+} /* End fepcmd */
+
+/* ---------------------------------------------------------------------
+	Digi products use fields in their channels structures that are very
+	similar to the c_cflag and c_iflag fields typically found in UNIX
+	termios structures.  The below three routines allow mappings 
+	between these hardware "flags" and their respective Linux flags.
+------------------------------------------------------------------------- */
+ 
+/* --------------------- Begin termios2digi_h -------------------- */
+
+static unsigned termios2digi_h(struct channel *ch, unsigned cflag)
+{ /* Begin termios2digi_h */
+
+	unsigned res = 0;
+
+	if (cflag & CRTSCTS) 
+	{
+		ch->digiext.digi_flags |= (RTSPACE | CTSPACE);
+		res |= ((ch->m_cts) | (ch->m_rts));
+	}
+
+	if (ch->digiext.digi_flags & RTSPACE)
+		res |= ch->m_rts;
+
+	if (ch->digiext.digi_flags & DTRPACE)
+		res |= ch->m_dtr;
+
+	if (ch->digiext.digi_flags & CTSPACE)
+		res |= ch->m_cts;
+
+	if (ch->digiext.digi_flags & DSRPACE)
+		res |= ch->dsr;
+
+	if (ch->digiext.digi_flags & DCDPACE)
+		res |= ch->dcd;
+
+	if (res & (ch->m_rts))
+		ch->digiext.digi_flags |= RTSPACE;
+
+	if (res & (ch->m_cts))
+		ch->digiext.digi_flags |= CTSPACE;
+
+	return res;
+
+} /* End termios2digi_h */
+
+/* --------------------- Begin termios2digi_i -------------------- */
+static unsigned termios2digi_i(struct channel *ch, unsigned iflag)
+{ /* Begin termios2digi_i */
+
+	unsigned res = iflag & (IGNBRK | BRKINT | IGNPAR | PARMRK | 
+	                        INPCK | ISTRIP|IXON|IXANY|IXOFF);
+	
+	if (ch->digiext.digi_flags & DIGI_AIXON)
+		res |= IAIXON;
+	return res;
+
+} /* End termios2digi_i */
+
+/* --------------------- Begin termios2digi_c -------------------- */
+
+static unsigned termios2digi_c(struct channel *ch, unsigned cflag)
+{ /* Begin termios2digi_c */
+
+	unsigned res = 0;
+
+#ifdef SPEED_HACK
+	/* CL: HACK to force 115200 at 38400 and 57600 at 19200 Baud */
+	if ((cflag & CBAUD)== B38400) cflag=cflag - B38400 + B115200;
+	if ((cflag & CBAUD)== B19200) cflag=cflag - B19200 + B57600;
+#endif /* SPEED_HACK */
+
+	if (cflag & CBAUDEX)
+	{ /* Begin detected CBAUDEX */
+
+		ch->digiext.digi_flags |= DIGI_FAST;
+
+		/* -------------------------------------------------------------
+		   HUPCL bit is used by FEP to indicate fast baud
+		   table is to be used.
+		----------------------------------------------------------------- */
+
+		res |= FEP_HUPCL;
+
+	} /* End detected CBAUDEX */
+	else ch->digiext.digi_flags &= ~DIGI_FAST; 
+
+	/* -------------------------------------------------------------------
+		CBAUD has bit position 0x1000 set these days to indicate Linux
+		baud rate remap.  Digi hardware can't handle the bit assignment.
+		(We use a different bit assignment for high speed.).  Clear this
+		bit out.
+	---------------------------------------------------------------------- */
+	res |= cflag & ((CBAUD ^ CBAUDEX) | PARODD | PARENB | CSTOPB | CSIZE);
+
+	/* -------------------------------------------------------------
+		This gets a little confusing.  The Digi cards have their own
+		representation of c_cflags controling baud rate.  For the most
+		part this is identical to the Linux implementation.  However;
+		Digi supports one rate (76800) that Linux doesn't.  This means 
+		that the c_cflag entry that would normally mean 76800 for Digi
+		actually means 115200 under Linux.  Without the below mapping,
+		a stty 115200 would only drive the board at 76800.  Since 
+		the rate 230400 is also found after 76800, the same problem afflicts	
+		us when we choose a rate of 230400.  Without the below modificiation
+		stty 230400 would actually give us 115200.
+
+		There are two additional differences.  The Linux value for CLOCAL
+		(0x800; 0004000) has no meaning to the Digi hardware.  Also in 
+		later releases of Linux; the CBAUD define has CBAUDEX (0x1000;
+		0010000) ored into it (CBAUD = 0x100f as opposed to 0xf). CBAUDEX
+		should be checked for a screened out prior to termios2digi_c 
+		returning.  Since CLOCAL isn't used by the board this can be
+		ignored as long as the returned value is used only by Digi hardware. 
+	----------------------------------------------------------------- */
+
+	if (cflag & CBAUDEX)
+	{
+		/* -------------------------------------------------------------
+			The below code is trying to guarantee that only baud rates
+			115200 and 230400 are remapped.  We use exclusive or because
+			the various baud rates share common bit positions and therefore
+			can't be tested for easily.
+		----------------------------------------------------------------- */
+
+				
+		if ((!((cflag & 0x7) ^ (B115200 & ~CBAUDEX))) || 
+		    (!((cflag & 0x7) ^ (B230400 & ~CBAUDEX))))
+		{
+			res += 1;
+		}
+	}
+
+	return res;
+
+} /* End termios2digi_c */
+
+/* --------------------- Begin epcaparam  ----------------------- */
+
+static void epcaparam(struct tty_struct *tty, struct channel *ch)
+{ /* Begin epcaparam */
+
+	unsigned int cmdHead;
+	struct termios *ts;
+	volatile struct board_chan *bc;
+	unsigned mval, hflow, cflag, iflag;
+
+	bc = ch->brdchan;
+	epcaassert(bc !=0, "bc out of range");
+
+	assertgwinon(ch);
+
+	ts = tty->termios;
+
+	if ((ts->c_cflag & CBAUD) == 0) 
+	{ /* Begin CBAUD detected */
+
+		cmdHead = bc->rin;
+		bc->rout = cmdHead;
+		cmdHead = bc->tin;
+
+		/* Changing baud in mid-stream transmission can be wonderful */
+		/* ---------------------------------------------------------------
+			Flush current transmit buffer by setting cmdTail pointer (tout)
+			to cmdHead pointer (tin).  Hopefully the transmit buffer is empty.
+		----------------------------------------------------------------- */
+
+		fepcmd(ch, STOUT, (unsigned) cmdHead, 0, 0, 0);
+		mval = 0;
+
+	} /* End CBAUD detected */
+	else 
+	{ /* Begin CBAUD not detected */
+
+		/* -------------------------------------------------------------------
+			c_cflags have changed but that change had nothing to do with BAUD.
+			Propagate the change to the card.
+		---------------------------------------------------------------------- */ 
+
+		cflag = termios2digi_c(ch, ts->c_cflag);
+
+		if (cflag != ch->fepcflag) 
+		{
+			ch->fepcflag = cflag;
+			/* Set baud rate, char size, stop bits, parity */
+			fepcmd(ch, SETCTRLFLAGS, (unsigned) cflag, 0, 0, 0);
+		}
+
+
+		/* ----------------------------------------------------------------
+			If the user has not forced CLOCAL and if the device is not a 
+			CALLOUT device (Which is always CLOCAL) we set flags such that
+			the driver will wait on carrier detect.
+		------------------------------------------------------------------- */
+
+		if (ts->c_cflag & CLOCAL)
+		{ /* Begin it is a cud device or a ttyD device with CLOCAL on */
+			ch->asyncflags &= ~ASYNC_CHECK_CD;
+		} /* End it is a cud device or a ttyD device with CLOCAL on */
+		else
+		{ /* Begin it is a ttyD device */
+			ch->asyncflags |= ASYNC_CHECK_CD;
+		} /* End it is a ttyD device */
+
+		mval = ch->m_dtr | ch->m_rts;
+
+	} /* End CBAUD not detected */
+
+	iflag = termios2digi_i(ch, ts->c_iflag);
+
+	/* Check input mode flags */
+
+	if (iflag != ch->fepiflag) 
+	{
+		ch->fepiflag = iflag;
+
+		/* ---------------------------------------------------------------
+			Command sets channels iflag structure on the board. Such things 
+			as input soft flow control, handling of parity errors, and
+			break handling are all set here.
+		------------------------------------------------------------------- */
+
+		/* break handling, parity handling, input stripping, flow control chars */
+		fepcmd(ch, SETIFLAGS, (unsigned int) ch->fepiflag, 0, 0, 0);
+	}
+
+	/* ---------------------------------------------------------------
+		Set the board mint value for this channel.  This will cause hardware
+		events to be generated each time the DCD signal (Described in mint) 
+		changes.	
+	------------------------------------------------------------------- */
+	bc->mint = ch->dcd;
+
+	if ((ts->c_cflag & CLOCAL) || (ch->digiext.digi_flags & DIGI_FORCEDCD))
+		if (ch->digiext.digi_flags & DIGI_FORCEDCD)
+			bc->mint = 0;
+
+	ch->imodem = bc->mstat;
+
+	hflow = termios2digi_h(ch, ts->c_cflag);
+
+	if (hflow != ch->hflow) 
+	{
+		ch->hflow = hflow;
+
+		/* --------------------------------------------------------------
+			Hard flow control has been selected but the board is not
+			using it.  Activate hard flow control now.
+		----------------------------------------------------------------- */
+
+		fepcmd(ch, SETHFLOW, hflow, 0xff, 0, 1);
+	}
+	
+
+	mval ^= ch->modemfake & (mval ^ ch->modem);
+
+	if (ch->omodem ^ mval) 
+	{
+		ch->omodem = mval;
+
+		/* --------------------------------------------------------------
+			The below command sets the DTR and RTS mstat structure.  If
+			hard flow control is NOT active these changes will drive the
+			output of the actual DTR and RTS lines.  If hard flow control 
+			is active, the changes will be saved in the mstat structure and
+			only asserted when hard flow control is turned off. 
+		----------------------------------------------------------------- */
+
+		/* First reset DTR & RTS; then set them */
+		fepcmd(ch, SETMODEM, 0, ((ch->m_dtr)|(ch->m_rts)), 0, 1);
+		fepcmd(ch, SETMODEM, mval, 0, 0, 1);
+
+	}
+
+	if (ch->startc != ch->fepstartc || ch->stopc != ch->fepstopc) 
+	{
+		ch->fepstartc = ch->startc;
+		ch->fepstopc = ch->stopc;
+
+		/* ------------------------------------------------------------
+			The XON / XOFF characters have changed; propagate these
+			changes to the card.	
+		--------------------------------------------------------------- */
+
+		fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
+	}
+
+	if (ch->startca != ch->fepstartca || ch->stopca != ch->fepstopca) 
+	{
+		ch->fepstartca = ch->startca;
+		ch->fepstopca = ch->stopca;
+
+		/* ---------------------------------------------------------------
+			Similar to the above, this time the auxilarly XON / XOFF 
+			characters have changed; propagate these changes to the card.
+		------------------------------------------------------------------ */
+
+		fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
+	}
+
+} /* End epcaparam */
+
+/* --------------------- Begin receive_data  ----------------------- */
+
+static void receive_data(struct channel *ch)
+{ /* Begin receive_data */
+
+	unchar *rptr;
+	struct termios *ts = NULL;
+	struct tty_struct *tty;
+	volatile struct board_chan *bc;
+	register int dataToRead, wrapgap, bytesAvailable;
+	register unsigned int tail, head;
+	unsigned int wrapmask;
+	int rc;
+
+
+	/* ---------------------------------------------------------------
+		This routine is called by doint when a receive data event 
+		has taken place.
+	------------------------------------------------------------------- */
+
+	globalwinon(ch);
+
+	if (ch->statusflags & RXSTOPPED)
+		return;
+
+	tty = ch->tty;
+	if (tty)
+		ts = tty->termios;
+
+	bc = ch->brdchan;
+
+	if (!bc) 
+	{
+		printk(KERN_ERR "<Error> - bc is NULL in receive_data!\n");
+		return;
+	}
+
+	wrapmask = ch->rxbufsize - 1;
+
+	/* --------------------------------------------------------------------- 
+		Get the head and tail pointers to the receiver queue.  Wrap the 
+		head pointer if it has reached the end of the buffer.
+	------------------------------------------------------------------------ */
+
+	head = bc->rin;
+	head &= wrapmask;
+	tail = bc->rout & wrapmask;
+
+	bytesAvailable = (head - tail) & wrapmask;
+
+	if (bytesAvailable == 0)
+		return;
+
+	/* ------------------------------------------------------------------
+	   If CREAD bit is off or device not open, set TX tail to head
+	--------------------------------------------------------------------- */
+
+	if (!tty || !ts || !(ts->c_cflag & CREAD)) 
+	{
+		bc->rout = head;
+		return;
+	}
+
+	if (tty->flip.count == TTY_FLIPBUF_SIZE) 
+		return;
+
+	if (bc->orun) 
+	{
+		bc->orun = 0;
+		printk(KERN_WARNING "overrun! DigiBoard device %s\n",tty->name);
+	}
+
+	rxwinon(ch);
+	rptr = tty->flip.char_buf_ptr;
+	rc = tty->flip.count;
+
+	while (bytesAvailable > 0) 
+	{ /* Begin while there is data on the card */
+
+		wrapgap = (head >= tail) ? head - tail : ch->rxbufsize - tail;
+
+		/* ---------------------------------------------------------------
+			Even if head has wrapped around only report the amount of
+			data to be equal to the size - tail.  Remember memcpy can't
+			automaticly wrap around the receive buffer.
+		----------------------------------------------------------------- */
+
+		dataToRead = (wrapgap < bytesAvailable) ? wrapgap : bytesAvailable;
+
+		/* --------------------------------------------------------------
+		   Make sure we don't overflow the buffer
+		----------------------------------------------------------------- */
+
+		if ((rc + dataToRead) > TTY_FLIPBUF_SIZE)
+			dataToRead = TTY_FLIPBUF_SIZE - rc;
+
+		if (dataToRead == 0)
+			break;
+
+		/* ---------------------------------------------------------------
+			Move data read from our card into the line disciplines buffer
+			for translation if necessary.
+		------------------------------------------------------------------ */
+
+		if ((memcpy(rptr, ch->rxptr + tail, dataToRead)) != rptr)
+			printk(KERN_ERR "<Error> - receive_data : memcpy failed\n");
+			
+		rc   += dataToRead;
+		rptr += dataToRead;
+		tail = (tail + dataToRead) & wrapmask;
+		bytesAvailable -= dataToRead;
+
+	} /* End while there is data on the card */
+
+
+	tty->flip.count = rc;
+	tty->flip.char_buf_ptr = rptr;
+	globalwinon(ch);
+	bc->rout = tail;
+
+	/* Must be called with global data */
+	tty_schedule_flip(ch->tty); 
+	return;
+
+} /* End receive_data */
+
+static int info_ioctl(struct tty_struct *tty, struct file * file,
+		    unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) 
+	{ /* Begin switch cmd */
+
+		case DIGI_GETINFO:
+		{ /* Begin case DIGI_GETINFO */
+
+			struct digi_info di ;
+			int brd;
+
+			getUser(brd, (unsigned int __user *)arg);
+
+			if ((brd < 0) || (brd >= num_cards) || (num_cards == 0))
+				return (-ENODEV);
+
+			memset(&di, 0, sizeof(di));
+
+			di.board = brd ; 
+			di.status = boards[brd].status;
+			di.type = boards[brd].type ;
+			di.numports = boards[brd].numports ;
+			di.port = boards[brd].port ;
+			di.membase = boards[brd].membase ;
+
+			if (copy_to_user((void __user *)arg, &di, sizeof (di)))
+				return -EFAULT;
+			break;
+
+		} /* End case DIGI_GETINFO */
+
+		case DIGI_POLLER:
+		{ /* Begin case DIGI_POLLER */
+
+			int brd = arg & 0xff000000 >> 16 ; 
+			unsigned char state = arg & 0xff ; 
+
+			if ((brd < 0) || (brd >= num_cards))
+			{
+				printk(KERN_ERR "<Error> - DIGI POLLER : brd not valid!\n");
+				return (-ENODEV);
+			}
+
+			digi_poller_inhibited = state ;
+			break ; 
+
+		} /* End case DIGI_POLLER */
+
+		case DIGI_INIT:
+		{ /* Begin case DIGI_INIT */
+
+			/* ------------------------------------------------------------
+				This call is made by the apps to complete the initilization
+				of the board(s).  This routine is responsible for setting
+				the card to its initial state and setting the drivers control
+				fields to the sutianle settings for the card in question.
+			---------------------------------------------------------------- */
+		
+			int crd ; 
+			for (crd = 0; crd < num_cards; crd++) 
+				post_fep_init (crd);
+
+			break ; 
+
+		} /* End case DIGI_INIT */
+
+
+		default:
+			return -ENOIOCTLCMD;
+
+	} /* End switch cmd */
+	return (0) ;
+}
+/* --------------------- Begin pc_ioctl  ----------------------- */
+
+static int pc_tiocmget(struct tty_struct *tty, struct file *file)
+{
+	struct channel *ch = (struct channel *) tty->driver_data;
+	volatile struct board_chan *bc;
+	unsigned int mstat, mflag = 0;
+	unsigned long flags;
+
+	if (ch)
+		bc = ch->brdchan;
+	else
+	{
+		printk(KERN_ERR "<Error> - ch is NULL in pc_tiocmget!\n");
+		return(-EINVAL);
+	}
+
+	save_flags(flags);
+	cli();
+	globalwinon(ch);
+	mstat = bc->mstat;
+	memoff(ch);
+	restore_flags(flags);
+
+	if (mstat & ch->m_dtr)
+		mflag |= TIOCM_DTR;
+
+	if (mstat & ch->m_rts)
+		mflag |= TIOCM_RTS;
+
+	if (mstat & ch->m_cts)
+		mflag |= TIOCM_CTS;
+
+	if (mstat & ch->dsr)
+		mflag |= TIOCM_DSR;
+
+	if (mstat & ch->m_ri)
+		mflag |= TIOCM_RI;
+
+	if (mstat & ch->dcd)
+		mflag |= TIOCM_CD;
+
+	return mflag;
+}
+
+static int pc_tiocmset(struct tty_struct *tty, struct file *file,
+		       unsigned int set, unsigned int clear)
+{
+	struct channel *ch = (struct channel *) tty->driver_data;
+	unsigned long flags;
+
+	if (!ch) {
+		printk(KERN_ERR "<Error> - ch is NULL in pc_tiocmset!\n");
+		return(-EINVAL);
+	}
+
+	save_flags(flags);
+	cli();
+	/*
+	 * I think this modemfake stuff is broken.  It doesn't
+	 * correctly reflect the behaviour desired by the TIOCM*
+	 * ioctls.  Therefore this is probably broken.
+	 */
+	if (set & TIOCM_RTS) {
+		ch->modemfake |= ch->m_rts;
+		ch->modem |= ch->m_rts;
+	}
+	if (set & TIOCM_DTR) {
+		ch->modemfake |= ch->m_dtr;
+		ch->modem |= ch->m_dtr;
+	}
+	if (clear & TIOCM_RTS) {
+		ch->modemfake |= ch->m_rts;
+		ch->modem &= ~ch->m_rts;
+	}
+	if (clear & TIOCM_DTR) {
+		ch->modemfake |= ch->m_dtr;
+		ch->modem &= ~ch->m_dtr;
+	}
+
+	globalwinon(ch);
+
+	/*  --------------------------------------------------------------
+		The below routine generally sets up parity, baud, flow control
+		issues, etc.... It effect both control flags and input flags.
+	------------------------------------------------------------------ */
+
+	epcaparam(tty,ch);
+	memoff(ch);
+	restore_flags(flags);
+	return 0;
+}
+
+static int pc_ioctl(struct tty_struct *tty, struct file * file,
+		    unsigned int cmd, unsigned long arg)
+{ /* Begin pc_ioctl */
+
+	digiflow_t dflow;
+	int retval;
+	unsigned long flags;
+	unsigned int mflag, mstat;
+	unsigned char startc, stopc;
+	volatile struct board_chan *bc;
+	struct channel *ch = (struct channel *) tty->driver_data;
+	void __user *argp = (void __user *)arg;
+	
+	if (ch)
+		bc = ch->brdchan;
+	else 
+	{
+		printk(KERN_ERR "<Error> - ch is NULL in pc_ioctl!\n");
+		return(-EINVAL);
+	}
+
+	save_flags(flags);
+
+	/* -------------------------------------------------------------------
+		For POSIX compliance we need to add more ioctls.  See tty_ioctl.c
+		in /usr/src/linux/drivers/char for a good example.  In particular 
+		think about adding TCSETAF, TCSETAW, TCSETA, TCSETSF, TCSETSW, TCSETS.
+	---------------------------------------------------------------------- */
+
+	switch (cmd) 
+	{ /* Begin switch cmd */
+
+		case TCGETS:
+			if (copy_to_user(argp, 
+					 tty->termios, sizeof(struct termios)))
+				return -EFAULT;
+			return(0);
+
+		case TCGETA:
+			return get_termio(tty, argp);
+
+		case TCSBRK:	/* SVID version: non-zero arg --> no break */
+
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+
+			/* Setup an event to indicate when the transmit buffer empties */
+
+			setup_empty_event(tty,ch);		
+			tty_wait_until_sent(tty, 0);
+			if (!arg)
+				digi_send_break(ch, HZ/4);    /* 1/4 second */
+			return 0;
+
+		case TCSBRKP:	/* support for POSIX tcsendbreak() */
+
+			retval = tty_check_change(tty);
+			if (retval)
+				return retval;
+
+			/* Setup an event to indicate when the transmit buffer empties */
+
+			setup_empty_event(tty,ch);		
+			tty_wait_until_sent(tty, 0);
+			digi_send_break(ch, arg ? arg*(HZ/10) : HZ/4);
+			return 0;
+
+		case TIOCGSOFTCAR:
+			if (put_user(C_CLOCAL(tty)?1:0, (unsigned long __user *)arg))
+				return -EFAULT;
+			return 0;
+
+		case TIOCSSOFTCAR:
+		{
+			unsigned int value;
+
+			if (get_user(value, (unsigned __user *)argp))
+				return -EFAULT;
+			tty->termios->c_cflag =
+				((tty->termios->c_cflag & ~CLOCAL) |
+				 (value ? CLOCAL : 0));
+			return 0;
+		}
+
+		case TIOCMODG:
+			mflag = pc_tiocmget(tty, file);
+			if (put_user(mflag, (unsigned long __user *)argp))
+				return -EFAULT;
+			break;
+
+		case TIOCMODS:
+			if (get_user(mstat, (unsigned __user *)argp))
+				return -EFAULT;
+			return pc_tiocmset(tty, file, mstat, ~mstat);
+
+		case TIOCSDTR:
+			ch->omodem |= ch->m_dtr;
+			cli();
+			globalwinon(ch);
+			fepcmd(ch, SETMODEM, ch->m_dtr, 0, 10, 1);
+			memoff(ch);
+			restore_flags(flags);
+			break;
+
+		case TIOCCDTR:
+			ch->omodem &= ~ch->m_dtr;
+			cli();
+			globalwinon(ch);
+			fepcmd(ch, SETMODEM, 0, ch->m_dtr, 10, 1);
+			memoff(ch);
+			restore_flags(flags);
+			break;
+
+		case DIGI_GETA:
+			if (copy_to_user(argp, &ch->digiext, sizeof(digi_t)))
+				return -EFAULT;
+			break;
+
+		case DIGI_SETAW:
+		case DIGI_SETAF:
+			if ((cmd) == (DIGI_SETAW)) 
+			{
+				/* Setup an event to indicate when the transmit buffer empties */
+
+				setup_empty_event(tty,ch);		
+				tty_wait_until_sent(tty, 0);
+			}
+			else 
+			{
+				/* ldisc lock already held in ioctl */
+				if (tty->ldisc.flush_buffer)
+					tty->ldisc.flush_buffer(tty);
+			}
+
+			/* Fall Thru */
+
+		case DIGI_SETA:
+			if (copy_from_user(&ch->digiext, argp, sizeof(digi_t)))
+				return -EFAULT;
+			
+			if (ch->digiext.digi_flags & DIGI_ALTPIN) 
+			{
+				ch->dcd = ch->m_dsr;
+				ch->dsr = ch->m_dcd;
+			} 
+			else 
+			{
+				ch->dcd = ch->m_dcd;
+				ch->dsr = ch->m_dsr;
+			}
+		
+			cli();
+			globalwinon(ch);
+
+			/* -----------------------------------------------------------------
+				The below routine generally sets up parity, baud, flow control 
+				issues, etc.... It effect both control flags and input flags.
+			------------------------------------------------------------------- */
+
+			epcaparam(tty,ch);
+			memoff(ch);
+			restore_flags(flags);
+			break;
+
+		case DIGI_GETFLOW:
+		case DIGI_GETAFLOW:
+			cli();	
+			globalwinon(ch);
+			if ((cmd) == (DIGI_GETFLOW)) 
+			{
+				dflow.startc = bc->startc;
+				dflow.stopc = bc->stopc;
+			}
+			else 
+			{
+				dflow.startc = bc->startca;
+				dflow.stopc = bc->stopca;
+			}
+			memoff(ch);
+			restore_flags(flags);
+
+			if (copy_to_user(argp, &dflow, sizeof(dflow)))
+				return -EFAULT;
+			break;
+
+		case DIGI_SETAFLOW:
+		case DIGI_SETFLOW:
+			if ((cmd) == (DIGI_SETFLOW)) 
+			{
+				startc = ch->startc;
+				stopc = ch->stopc;
+			} 
+			else 
+			{
+				startc = ch->startca;
+				stopc = ch->stopca;
+			}
+
+			if (copy_from_user(&dflow, argp, sizeof(dflow)))
+				return -EFAULT;
+
+			if (dflow.startc != startc || dflow.stopc != stopc) 
+			{ /* Begin  if setflow toggled */
+				cli();
+				globalwinon(ch);
+
+				if ((cmd) == (DIGI_SETFLOW)) 
+				{
+					ch->fepstartc = ch->startc = dflow.startc;
+					ch->fepstopc = ch->stopc = dflow.stopc;
+					fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
+				} 
+				else 
+				{
+					ch->fepstartca = ch->startca = dflow.startc;
+					ch->fepstopca  = ch->stopca = dflow.stopc;
+					fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
+				}
+
+				if	(ch->statusflags & TXSTOPPED)
+					pc_start(tty);
+
+				memoff(ch);
+				restore_flags(flags);
+
+			} /* End if setflow toggled */
+			break;
+
+		default:
+			return -ENOIOCTLCMD;
+
+	} /* End switch cmd */
+
+	return 0;
+
+} /* End pc_ioctl */
+
+/* --------------------- Begin pc_set_termios  ----------------------- */
+
+static void pc_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{ /* Begin pc_set_termios */
+
+	struct channel *ch;
+	unsigned long flags;
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{ /* Begin if channel valid */
+
+		save_flags(flags);
+		cli();
+		globalwinon(ch);
+		epcaparam(tty, ch);
+		memoff(ch);
+
+		if ((old_termios->c_cflag & CRTSCTS) &&
+			 ((tty->termios->c_cflag & CRTSCTS) == 0))
+			tty->hw_stopped = 0;
+
+		if (!(old_termios->c_cflag & CLOCAL) &&
+			 (tty->termios->c_cflag & CLOCAL))
+			wake_up_interruptible(&ch->open_wait);
+
+		restore_flags(flags);
+
+	} /* End if channel valid */
+
+} /* End pc_set_termios */
+
+/* --------------------- Begin do_softint  ----------------------- */
+
+static void do_softint(void *private_)
+{ /* Begin do_softint */
+
+	struct channel *ch = (struct channel *) private_;
+	
+
+	/* Called in response to a modem change event */
+
+	if (ch && ch->magic == EPCA_MAGIC) 
+	{ /* Begin EPCA_MAGIC */
+
+		struct tty_struct *tty = ch->tty;
+
+		if (tty && tty->driver_data) 
+		{ 
+			if (test_and_clear_bit(EPCA_EVENT_HANGUP, &ch->event)) 
+			{ /* Begin if clear_bit */
+
+				tty_hangup(tty);	/* FIXME: module removal race here - AKPM */
+				wake_up_interruptible(&ch->open_wait);
+				ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
+
+			} /* End if clear_bit */
+		}
+
+	} /* End EPCA_MAGIC */
+} /* End do_softint */
+
+/* ------------------------------------------------------------
+	pc_stop and pc_start provide software flow control to the 
+	routine and the pc_ioctl routine.
+---------------------------------------------------------------- */
+
+/* --------------------- Begin pc_stop  ----------------------- */
+
+static void pc_stop(struct tty_struct *tty)
+{ /* Begin pc_stop */
+
+	struct channel *ch;
+	unsigned long flags;
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{ /* Begin if valid channel */
+
+		save_flags(flags); 
+		cli();
+
+		if ((ch->statusflags & TXSTOPPED) == 0) 
+		{ /* Begin if transmit stop requested */
+
+			globalwinon(ch);
+
+			/* STOP transmitting now !! */
+
+			fepcmd(ch, PAUSETX, 0, 0, 0, 0);
+
+			ch->statusflags |= TXSTOPPED;
+			memoff(ch);
+
+		} /* End if transmit stop requested */
+
+		restore_flags(flags);
+
+	} /* End if valid channel */
+
+} /* End pc_stop */
+
+/* --------------------- Begin pc_start  ----------------------- */
+
+static void pc_start(struct tty_struct *tty)
+{ /* Begin pc_start */
+
+	struct channel *ch;
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{ /* Begin if channel valid */
+
+		unsigned long flags;
+
+		save_flags(flags);
+		cli();
+
+		/* Just in case output was resumed because of a change in Digi-flow */
+		if (ch->statusflags & TXSTOPPED) 
+		{ /* Begin transmit resume requested */
+
+			volatile struct board_chan *bc;
+
+			globalwinon(ch);
+			bc = ch->brdchan;
+			if (ch->statusflags & LOWWAIT)
+				bc->ilow = 1;
+
+			/* Okay, you can start transmitting again... */
+
+			fepcmd(ch, RESUMETX, 0, 0, 0, 0);
+
+			ch->statusflags &= ~TXSTOPPED;
+			memoff(ch);
+
+		} /* End transmit resume requested */
+
+		restore_flags(flags);
+
+	} /* End if channel valid */
+
+} /* End pc_start */
+
+/* ------------------------------------------------------------------
+	The below routines pc_throttle and pc_unthrottle are used 
+	to slow (And resume) the receipt of data into the kernels
+	receive buffers.  The exact occurrence of this depends on the
+	size of the kernels receive buffer and what the 'watermarks'
+	are set to for that buffer.  See the n_ttys.c file for more
+	details. 
+______________________________________________________________________ */
+/* --------------------- Begin throttle  ----------------------- */
+
+static void pc_throttle(struct tty_struct * tty)
+{ /* Begin pc_throttle */
+
+	struct channel *ch;
+	unsigned long flags;
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{ /* Begin if channel valid */
+
+
+		save_flags(flags);
+		cli();
+
+		if ((ch->statusflags & RXSTOPPED) == 0)
+		{
+			globalwinon(ch);
+			fepcmd(ch, PAUSERX, 0, 0, 0, 0);
+
+			ch->statusflags |= RXSTOPPED;
+			memoff(ch);
+		}
+		restore_flags(flags);
+
+	} /* End if channel valid */
+
+} /* End pc_throttle */
+
+/* --------------------- Begin unthrottle  ----------------------- */
+
+static void pc_unthrottle(struct tty_struct *tty)
+{ /* Begin pc_unthrottle */
+
+	struct channel *ch;
+	unsigned long flags;
+	volatile struct board_chan *bc;
+
+
+	/* ---------------------------------------------------------
+		verifyChannel returns the channel from the tty struct
+		if it is valid.  This serves as a sanity check.
+	------------------------------------------------------------- */
+
+	if ((ch = verifyChannel(tty)) != NULL) 
+	{ /* Begin if channel valid */
+
+
+		/* Just in case output was resumed because of a change in Digi-flow */
+		save_flags(flags);
+		cli();
+
+		if (ch->statusflags & RXSTOPPED) 
+		{
+
+			globalwinon(ch);
+			bc = ch->brdchan;
+			fepcmd(ch, RESUMERX, 0, 0, 0, 0);
+
+			ch->statusflags &= ~RXSTOPPED;
+			memoff(ch);
+		}
+		restore_flags(flags);
+
+	} /* End if channel valid */
+
+} /* End pc_unthrottle */
+
+/* --------------------- Begin digi_send_break  ----------------------- */
+
+void digi_send_break(struct channel *ch, int msec)
+{ /* Begin digi_send_break */
+
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	globalwinon(ch);
+
+	/* -------------------------------------------------------------------- 
+	   Maybe I should send an infinite break here, schedule() for
+	   msec amount of time, and then stop the break.  This way,
+	   the user can't screw up the FEP by causing digi_send_break()
+	   to be called (i.e. via an ioctl()) more than once in msec amount 
+	   of time.  Try this for now...
+	------------------------------------------------------------------------ */
+
+	fepcmd(ch, SENDBREAK, msec, 0, 10, 0);
+	memoff(ch);
+
+	restore_flags(flags);
+
+} /* End digi_send_break */
+
+/* --------------------- Begin setup_empty_event  ----------------------- */
+
+static void setup_empty_event(struct tty_struct *tty, struct channel *ch)
+{ /* Begin setup_empty_event */
+
+	volatile struct board_chan *bc = ch->brdchan;
+	unsigned long int flags;
+
+	save_flags(flags);
+	cli();
+	globalwinon(ch);
+	ch->statusflags |= EMPTYWAIT;
+	
+	/* ------------------------------------------------------------------
+		When set the iempty flag request a event to be generated when the 
+		transmit buffer is empty (If there is no BREAK in progress).
+	--------------------------------------------------------------------- */
+
+	bc->iempty = 1;
+	memoff(ch);
+	restore_flags(flags);
+
+} /* End setup_empty_event */
+
+/* --------------------- Begin get_termio ----------------------- */
+
+static int get_termio(struct tty_struct * tty, struct termio __user * termio)
+{ /* Begin get_termio */
+	return kernel_termios_to_user_termio(termio, tty->termios);
+} /* End get_termio */
+/* ---------------------- Begin epca_setup  -------------------------- */
+void epca_setup(char *str, int *ints)
+{ /* Begin epca_setup */
+
+	struct board_info board;
+	int               index, loop, last;
+	char              *temp, *t2;
+	unsigned          len;
+
+	/* ----------------------------------------------------------------------
+		If this routine looks a little strange it is because it is only called
+		if a LILO append command is given to boot the kernel with parameters.  
+		In this way, we can provide the user a method of changing his board
+		configuration without rebuilding the kernel.
+	----------------------------------------------------------------------- */
+	if (!liloconfig) 
+		liloconfig = 1; 
+
+	memset(&board, 0, sizeof(board));
+
+	/* Assume the data is int first, later we can change it */
+	/* I think that array position 0 of ints holds the number of args */
+	for (last = 0, index = 1; index <= ints[0]; index++)
+		switch(index)
+		{ /* Begin parse switch */
+
+			case 1:
+				board.status = ints[index];
+				
+				/* ---------------------------------------------------------
+					We check for 2 (As opposed to 1; because 2 is a flag
+					instructing the driver to ignore epcaconfig.)  For this
+					reason we check for 2.
+				------------------------------------------------------------ */ 
+				if (board.status == 2)
+				{ /* Begin ignore epcaconfig as well as lilo cmd line */
+					nbdevs = 0;
+					num_cards = 0;
+					return;
+				} /* End ignore epcaconfig as well as lilo cmd line */
+	
+				if (board.status > 2)
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid board status 0x%x\n", board.status);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_BOARD_STATUS;
+					return;
+				}
+				last = index;
+				break;
+
+			case 2:
+				board.type = ints[index];
+				if (board.type >= PCIXEM) 
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid board type 0x%x\n", board.type);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_BOARD_TYPE;
+					return;
+				}
+				last = index;
+				break;
+
+			case 3:
+				board.altpin = ints[index];
+				if (board.altpin > 1)
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid board altpin 0x%x\n", board.altpin);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_ALTPIN;
+					return;
+				}
+				last = index;
+				break;
+
+			case 4:
+				board.numports = ints[index];
+				if ((board.numports < 2) || (board.numports > 256))
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid board numports 0x%x\n", board.numports);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_NUM_PORTS;
+					return;
+				}
+				nbdevs += board.numports;
+				last = index;
+				break;
+
+			case 5:
+				board.port = (unsigned char *)ints[index];
+				if (ints[index] <= 0)
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid io port 0x%x\n", (unsigned int)board.port);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_PORT_BASE;
+					return;
+				}
+				last = index;
+				break;
+
+			case 6:
+				board.membase = (unsigned char *)ints[index];
+				if (ints[index] <= 0)
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid memory base 0x%x\n",(unsigned int)board.membase);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_MEM_BASE;
+					return;
+				}
+				last = index;
+				break;
+
+			default:
+				printk(KERN_ERR "<Error> - epca_setup: Too many integer parms\n");
+				return;
+
+		} /* End parse switch */
+
+	while (str && *str) 
+	{ /* Begin while there is a string arg */
+
+		/* find the next comma or terminator */
+		temp = str;
+
+		/* While string is not null, and a comma hasn't been found */
+		while (*temp && (*temp != ','))
+			temp++;
+
+		if (!*temp)
+			temp = NULL;
+		else
+			*temp++ = 0;
+
+		/* Set index to the number of args + 1 */
+		index = last + 1;
+
+		switch(index)
+		{
+			case 1:
+				len = strlen(str);
+				if (strncmp("Disable", str, len) == 0) 
+					board.status = 0;
+				else
+				if (strncmp("Enable", str, len) == 0)
+					board.status = 1;
+				else
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid status %s\n", str);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_BOARD_STATUS;
+					return;
+				}
+				last = index;
+				break;
+
+			case 2:
+
+				for(loop = 0; loop < EPCA_NUM_TYPES; loop++)
+					if (strcmp(board_desc[loop], str) == 0)
+						break;
+
+
+				/* ---------------------------------------------------------------
+					If the index incremented above refers to a legitamate board 
+					type set it here. 
+				------------------------------------------------------------------*/
+
+				if (index < EPCA_NUM_TYPES) 
+					board.type = loop;
+				else
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid board type: %s\n", str);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_BOARD_TYPE;
+					return;
+				}
+				last = index;
+				break;
+
+			case 3:
+				len = strlen(str);
+				if (strncmp("Disable", str, len) == 0) 
+					board.altpin = 0;
+				else
+				if (strncmp("Enable", str, len) == 0)
+					board.altpin = 1;
+				else
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid altpin %s\n", str);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_ALTPIN;
+					return;
+				}
+				last = index;
+				break;
+
+			case 4:
+				t2 = str;
+				while (isdigit(*t2))
+					t2++;
+
+				if (*t2)
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid port count %s\n", str);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_NUM_PORTS;
+					return;
+				}
+
+				/* ------------------------------------------------------------
+					There is not a man page for simple_strtoul but the code can be 
+					found in vsprintf.c.  The first argument is the string to 
+					translate (To an unsigned long obviously),  the second argument
+					can be the address of any character variable or a NULL.  If a
+					variable is given, the end pointer of the string will be stored 
+					in that variable; if a NULL is given the end pointer will 
+					not be returned.  The last argument is the base to use.  If 
+					a 0 is indicated, the routine will attempt to determine the 
+					proper base by looking at the values prefix (A '0' for octal,
+					a 'x' for hex, etc ...  If a value is given it will use that 
+					value as the base. 
+				---------------------------------------------------------------- */ 
+				board.numports = simple_strtoul(str, NULL, 0);
+				nbdevs += board.numports;
+				last = index;
+				break;
+
+			case 5:
+				t2 = str;
+				while (isxdigit(*t2))
+					t2++;
+
+				if (*t2)
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid i/o address %s\n", str);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_PORT_BASE;
+					return;
+				}
+
+				board.port = (unsigned char *)simple_strtoul(str, NULL, 16);
+				last = index;
+				break;
+
+			case 6:
+				t2 = str;
+				while (isxdigit(*t2))
+					t2++;
+
+				if (*t2)
+				{
+					printk(KERN_ERR "<Error> - epca_setup: Invalid memory base %s\n",str);
+					invalid_lilo_config = 1;
+					setup_error_code |= INVALID_MEM_BASE;
+					return;
+				}
+
+				board.membase = (unsigned char *)simple_strtoul(str, NULL, 16);
+				last = index;
+				break;
+
+			default:
+				printk(KERN_ERR "PC/Xx: Too many string parms\n");
+				return;
+		}
+		str = temp;
+
+	} /* End while there is a string arg */
+
+
+	if (last < 6)  
+	{
+		printk(KERN_ERR "PC/Xx: Insufficient parms specified\n");
+		return;
+	}
+ 
+	/* I should REALLY validate the stuff here */
+
+	/* Copies our local copy of board into boards */
+	memcpy((void *)&boards[num_cards],(void *)&board, sizeof(board));
+
+
+	/* Does this get called once per lilo arg are what ? */
+
+	printk(KERN_INFO "PC/Xx: Added board %i, %s %i ports at 0x%4.4X base 0x%6.6X\n", 
+		num_cards, board_desc[board.type], 
+		board.numports, (int)board.port, (unsigned int) board.membase);
+
+	num_cards++;
+
+} /* End epca_setup */
+
+
+
+#ifdef ENABLE_PCI
+/* ------------------------ Begin init_PCI  --------------------------- */
+
+enum epic_board_types {
+	brd_xr = 0,
+	brd_xem,
+	brd_cx,
+	brd_xrj,
+};
+
+
+/* indexed directly by epic_board_types enum */
+static struct {
+	unsigned char board_type;
+	unsigned bar_idx;		/* PCI base address region */
+} epca_info_tbl[] = {
+	{ PCIXR, 0, },
+	{ PCIXEM, 0, },
+	{ PCICX, 0, },
+	{ PCIXRJ, 2, },
+};
+
+
+static int __devinit epca_init_one (struct pci_dev *pdev,
+				 const struct pci_device_id *ent)
+{
+	static int board_num = -1;
+	int board_idx, info_idx = ent->driver_data;
+	unsigned long addr;
+
+	if (pci_enable_device(pdev))
+		return -EIO;
+
+	board_num++;
+	board_idx = board_num + num_cards;
+	if (board_idx >= MAXBOARDS)
+		goto err_out;
+	
+	addr = pci_resource_start (pdev, epca_info_tbl[info_idx].bar_idx);
+	if (!addr) {
+		printk (KERN_ERR PFX "PCI region #%d not available (size 0)\n",
+			epca_info_tbl[info_idx].bar_idx);
+		goto err_out;
+	}
+
+	boards[board_idx].status = ENABLED;
+	boards[board_idx].type = epca_info_tbl[info_idx].board_type;
+	boards[board_idx].numports = 0x0;
+	boards[board_idx].port =
+		(unsigned char *)((char *) addr + PCI_IO_OFFSET);
+	boards[board_idx].membase =
+		(unsigned char *)((char *) addr);
+
+	if (!request_mem_region (addr + PCI_IO_OFFSET, 0x200000, "epca")) {
+		printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailable\n",
+			0x200000, addr + PCI_IO_OFFSET);
+		goto err_out;
+	}
+
+	boards[board_idx].re_map_port = ioremap(addr + PCI_IO_OFFSET, 0x200000);
+	if (!boards[board_idx].re_map_port) {
+		printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lx\n",
+			0x200000, addr + PCI_IO_OFFSET);
+		goto err_out_free_pciio;
+	}
+
+	if (!request_mem_region (addr, 0x200000, "epca")) {
+		printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailable\n",
+			0x200000, addr);
+		goto err_out_free_iounmap;
+	}
+
+	boards[board_idx].re_map_membase = ioremap(addr, 0x200000);
+	if (!boards[board_idx].re_map_membase) {
+		printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lx\n",
+			0x200000, addr + PCI_IO_OFFSET);
+		goto err_out_free_memregion;
+	}
+
+	/* --------------------------------------------------------------
+		I don't know what the below does, but the hardware guys say
+		its required on everything except PLX (In this case XRJ).
+	---------------------------------------------------------------- */
+	if (info_idx != brd_xrj) {
+		pci_write_config_byte(pdev, 0x40, 0);  
+		pci_write_config_byte(pdev, 0x46, 0);
+	}
+	
+	return 0;
+
+err_out_free_memregion:
+	release_mem_region (addr, 0x200000);
+err_out_free_iounmap:
+	iounmap (boards[board_idx].re_map_port);
+err_out_free_pciio:
+	release_mem_region (addr + PCI_IO_OFFSET, 0x200000);
+err_out:
+	return -ENODEV;
+}
+
+
+static struct pci_device_id epca_pci_tbl[] = {
+	{ PCI_VENDOR_DIGI, PCI_DEVICE_XR, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xr },
+	{ PCI_VENDOR_DIGI, PCI_DEVICE_XEM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xem },
+	{ PCI_VENDOR_DIGI, PCI_DEVICE_CX, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_cx },
+	{ PCI_VENDOR_DIGI, PCI_DEVICE_XRJ, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xrj },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, epca_pci_tbl);
+
+int __init init_PCI (void)
+{ /* Begin init_PCI */
+	memset (&epca_driver, 0, sizeof (epca_driver));
+	epca_driver.name = "epca";
+	epca_driver.id_table = epca_pci_tbl;
+	epca_driver.probe = epca_init_one;
+
+	return pci_register_driver(&epca_driver);
+} /* End init_PCI */
+
+#endif /* ENABLE_PCI */
+
+MODULE_LICENSE("GPL");