[PATCH 03/19] staging: dgap: Merge dgap_tty.c into dgap_driver.c

[Mark Hounschell <markh@compro.net>]

There is a lot of cleanup work to do on these digi drivers and merging as
much as is possible will make it easier. I also notice that many merged 
drivers are single source and header.

Signed-off-by: Mark Hounschell <markh@compro.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/staging/dgap/Makefile      |    2 +-
 drivers/staging/dgap/dgap_driver.c | 3495 +++++++++++++++++++++++++++++++++++
 drivers/staging/dgap/dgap_tty.c    | 3555 ------------------------------------
 3 files changed, 3496 insertions(+), 3556 deletions(-)
 delete mode 100644 drivers/staging/dgap/dgap_tty.c

diff --git a/drivers/staging/dgap/Makefile b/drivers/staging/dgap/Makefile
index 3abe8d2..b80cad5 100644
--- a/drivers/staging/dgap/Makefile
+++ b/drivers/staging/dgap/Makefile
@@ -3,5 +3,5 @@ obj-$(CONFIG_DGAP) += dgap.o
 
 dgap-objs :=	dgap_driver.o   dgap_fep5.o \
 		dgap_parse.o	dgap_trace.o \
-		dgap_tty.o	dgap_sysfs.o
+		dgap_sysfs.o
 
diff --git a/drivers/staging/dgap/dgap_driver.c b/drivers/staging/dgap/dgap_driver.c
index 0f5fb12..b49f698 100644
--- a/drivers/staging/dgap/dgap_driver.c
+++ b/drivers/staging/dgap/dgap_driver.c
@@ -38,6 +38,13 @@
 #include <asm/uaccess.h>	/* For copy_from_user/copy_to_user */
 #include <linux/sched.h>
 
+#include <linux/interrupt.h>	/* For tasklet and interrupt structs/defines */
+#include <linux/ctype.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_reg.h>
+#include <asm/io.h>		/* For read[bwl]/write[bwl] */
+
 #include "dgap_driver.h"
 #include "dgap_pci.h"
 #include "dgap_fep5.h"
@@ -46,6 +53,11 @@
 #include "dgap_parse.h"
 #include "dgap_trace.h"
 #include "dgap_sysfs.h"
+#include "dgap_types.h"
+
+#define init_MUTEX(sem)         sema_init(sem, 1)
+#define DECLARE_MUTEX(name)     \
+        struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Digi International, http://www.digi.com");
@@ -82,6 +94,38 @@ static void		dgap_mbuf(struct board_t *brd, const char *fmt, ...);
 static int		dgap_do_remap(struct board_t *brd);
 static irqreturn_t	dgap_intr(int irq, void *voidbrd);
 
+/* Our function prototypes */
+static int dgap_tty_open(struct tty_struct *tty, struct file *file);
+static void dgap_tty_close(struct tty_struct *tty, struct file *file);
+static int dgap_block_til_ready(struct tty_struct *tty, struct file *file, struct channel_t *ch);
+static int dgap_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
+static int dgap_tty_digigeta(struct tty_struct *tty, struct digi_t __user *retinfo);
+static int dgap_tty_digiseta(struct tty_struct *tty, struct digi_t __user *new_info);
+static int dgap_tty_digigetedelay(struct tty_struct *tty, int __user *retinfo);
+static int dgap_tty_digisetedelay(struct tty_struct *tty, int __user *new_info);
+static int dgap_tty_write_room(struct tty_struct* tty);
+static int dgap_tty_chars_in_buffer(struct tty_struct* tty);
+static void dgap_tty_start(struct tty_struct *tty);
+static void dgap_tty_stop(struct tty_struct *tty);
+static void dgap_tty_throttle(struct tty_struct *tty);
+static void dgap_tty_unthrottle(struct tty_struct *tty);
+static void dgap_tty_flush_chars(struct tty_struct *tty);
+static void dgap_tty_flush_buffer(struct tty_struct *tty);
+static void dgap_tty_hangup(struct tty_struct *tty);
+static int dgap_wait_for_drain(struct tty_struct *tty);
+static int dgap_set_modem_info(struct tty_struct *tty, unsigned int command, unsigned int __user *value);
+static int dgap_get_modem_info(struct channel_t *ch, unsigned int __user *value);
+static int dgap_tty_digisetcustombaud(struct tty_struct *tty, int __user *new_info);
+static int dgap_tty_digigetcustombaud(struct tty_struct *tty, int __user *retinfo);
+static int dgap_tty_tiocmget(struct tty_struct *tty);
+static int dgap_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear);
+static int dgap_tty_send_break(struct tty_struct *tty, int msec);
+static void dgap_tty_wait_until_sent(struct tty_struct *tty, int timeout);
+static int dgap_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
+static void dgap_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios);
+static int dgap_tty_put_char(struct tty_struct *tty, unsigned char c);
+static void dgap_tty_send_xchar(struct tty_struct *tty, char ch);
+
 /* Driver load/unload functions */
 int			dgap_init_module(void);
 void			dgap_cleanup_module(void);
@@ -121,6 +165,10 @@ static uint		dgap_driver_start = FALSE;
 
 static struct class *	dgap_class;
 
+static struct board_t	*dgap_BoardsByMajor[256];
+static uchar		*dgap_TmpWriteBuf = NULL;
+static DECLARE_MUTEX(dgap_TmpWriteSem);
+
 /*
  * Poller stuff
  */
@@ -220,6 +268,62 @@ char *dgap_driver_state_text[] = {
 	"Driver Ready."
 };
 
+/*
+ * Default transparent print information.
+ */
+static struct digi_t dgap_digi_init = {
+	.digi_flags =	DIGI_COOK,	/* Flags			*/
+	.digi_maxcps =	100,		/* Max CPS			*/
+	.digi_maxchar =	50,		/* Max chars in print queue	*/
+	.digi_bufsize =	100,		/* Printer buffer size		*/
+	.digi_onlen =	4,		/* size of printer on string	*/
+	.digi_offlen =	4,		/* size of printer off string	*/
+	.digi_onstr =	"\033[5i",	/* ANSI printer on string ]	*/
+	.digi_offstr =	"\033[4i",	/* ANSI printer off string ]	*/
+	.digi_term =	"ansi"		/* default terminal type	*/
+};
+
+
+/*
+ * Define a local default termios struct. All ports will be created
+ * with this termios initially.
+ *
+ * This defines a raw port at 9600 baud, 8 data bits, no parity,
+ * 1 stop bit.
+ */
+
+static struct ktermios DgapDefaultTermios =
+{
+	.c_iflag =	(DEFAULT_IFLAGS),	/* iflags */
+	.c_oflag =	(DEFAULT_OFLAGS),	/* oflags */
+	.c_cflag =	(DEFAULT_CFLAGS),	/* cflags */
+	.c_lflag =	(DEFAULT_LFLAGS),	/* lflags */
+	.c_cc =		INIT_C_CC,
+	.c_line = 	0,
+};
+
+static const struct tty_operations dgap_tty_ops = {
+	.open = dgap_tty_open,
+	.close = dgap_tty_close,
+	.write = dgap_tty_write,
+	.write_room = dgap_tty_write_room,
+	.flush_buffer = dgap_tty_flush_buffer,
+	.chars_in_buffer = dgap_tty_chars_in_buffer,
+	.flush_chars = dgap_tty_flush_chars,
+	.ioctl = dgap_tty_ioctl,
+	.set_termios = dgap_tty_set_termios,
+	.stop = dgap_tty_stop,
+	.start = dgap_tty_start,
+	.throttle = dgap_tty_throttle,
+	.unthrottle = dgap_tty_unthrottle,
+	.hangup = dgap_tty_hangup,
+	.put_char = dgap_tty_put_char,
+	.tiocmget = dgap_tty_tiocmget,
+	.tiocmset = dgap_tty_tiocmset,
+	.break_ctl = dgap_tty_send_break,
+	.wait_until_sent = dgap_tty_wait_until_sent,
+	.send_xchar = dgap_tty_send_xchar
+};
 
 
 /************************************************************************
@@ -1027,3 +1131,3394 @@ char *dgap_ioctl_name(int cmd)
 	default:		return("unknown");
 	}
 }
+
+/************************************************************************
+ *
+ * TTY Initialization/Cleanup Functions
+ *
+ ************************************************************************/
+
+/*
+ * dgap_tty_preinit()
+ *
+ * Initialize any global tty related data before we download any boards.
+ */
+int dgap_tty_preinit(void)
+{
+	unsigned long flags;
+
+	DGAP_LOCK(dgap_global_lock, flags);
+
+	/*
+	 * Allocate a buffer for doing the copy from user space to
+	 * kernel space in dgap_input().  We only use one buffer and
+	 * control access to it with a semaphore.  If we are paging, we
+	 * are already in trouble so one buffer won't hurt much anyway.
+	 */
+	dgap_TmpWriteBuf = kmalloc(WRITEBUFLEN, GFP_ATOMIC);
+
+	if (!dgap_TmpWriteBuf) {
+		DGAP_UNLOCK(dgap_global_lock, flags);
+		DPR_INIT(("unable to allocate tmp write buf"));
+		return (-ENOMEM);
+	}
+
+        DGAP_UNLOCK(dgap_global_lock, flags);
+        return(0);
+}
+
+
+/*
+ * dgap_tty_register()
+ *
+ * Init the tty subsystem for this board.
+ */
+int dgap_tty_register(struct board_t *brd)
+{
+	int rc = 0;
+
+	DPR_INIT(("tty_register start"));
+
+	brd->SerialDriver = alloc_tty_driver(MAXPORTS);
+
+	snprintf(brd->SerialName, MAXTTYNAMELEN, "tty_dgap_%d_", brd->boardnum);
+	brd->SerialDriver->name = brd->SerialName;
+	brd->SerialDriver->name_base = 0;
+	brd->SerialDriver->major = 0;
+	brd->SerialDriver->minor_start = 0;
+	brd->SerialDriver->type = TTY_DRIVER_TYPE_SERIAL;
+	brd->SerialDriver->subtype = SERIAL_TYPE_NORMAL;
+	brd->SerialDriver->init_termios = DgapDefaultTermios;
+	brd->SerialDriver->driver_name = DRVSTR;
+	brd->SerialDriver->flags = (TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_HARDWARE_BREAK);
+
+	/* The kernel wants space to store pointers to tty_structs */
+	brd->SerialDriver->ttys = kzalloc(MAXPORTS * sizeof(struct tty_struct *), GFP_KERNEL);
+	if (!brd->SerialDriver->ttys)
+		return(-ENOMEM);
+
+	/*
+	 * Entry points for driver.  Called by the kernel from
+	 * tty_io.c and n_tty.c.
+	 */
+	tty_set_operations(brd->SerialDriver, &dgap_tty_ops);
+
+	/*
+	 * If we're doing transparent print, we have to do all of the above
+	 * again, separately so we don't get the LD confused about what major
+	 * we are when we get into the dgap_tty_open() routine.
+	 */
+	brd->PrintDriver = alloc_tty_driver(MAXPORTS);
+
+	snprintf(brd->PrintName, MAXTTYNAMELEN, "pr_dgap_%d_", brd->boardnum);
+	brd->PrintDriver->name = brd->PrintName;
+	brd->PrintDriver->name_base = 0;
+	brd->PrintDriver->major = 0;
+	brd->PrintDriver->minor_start = 0;
+	brd->PrintDriver->type = TTY_DRIVER_TYPE_SERIAL;
+	brd->PrintDriver->subtype = SERIAL_TYPE_NORMAL;
+	brd->PrintDriver->init_termios = DgapDefaultTermios;
+	brd->PrintDriver->driver_name = DRVSTR;
+	brd->PrintDriver->flags = (TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_HARDWARE_BREAK);
+
+	/* The kernel wants space to store pointers to tty_structs */
+	brd->PrintDriver->ttys = kzalloc(MAXPORTS * sizeof(struct tty_struct *), GFP_KERNEL);
+	if (!brd->PrintDriver->ttys)
+		return(-ENOMEM);
+
+	/*
+	 * Entry points for driver.  Called by the kernel from
+	 * tty_io.c and n_tty.c.
+	 */
+	tty_set_operations(brd->PrintDriver, &dgap_tty_ops);
+
+	if (!brd->dgap_Major_Serial_Registered) {
+		/* Register tty devices */
+		rc = tty_register_driver(brd->SerialDriver);
+		if (rc < 0) {
+			APR(("Can't register tty device (%d)\n", rc));
+			return(rc);
+		}
+		brd->dgap_Major_Serial_Registered = TRUE;
+		dgap_BoardsByMajor[brd->SerialDriver->major] = brd;
+		brd->dgap_Serial_Major = brd->SerialDriver->major;
+	}
+
+	if (!brd->dgap_Major_TransparentPrint_Registered) {
+		/* Register Transparent Print devices */
+ 		rc = tty_register_driver(brd->PrintDriver);
+		if (rc < 0) {
+			APR(("Can't register Transparent Print device (%d)\n", rc));
+			return(rc);
+		}
+		brd->dgap_Major_TransparentPrint_Registered = TRUE;
+		dgap_BoardsByMajor[brd->PrintDriver->major] = brd;
+		brd->dgap_TransparentPrint_Major = brd->PrintDriver->major;
+	}
+
+	DPR_INIT(("DGAP REGISTER TTY: MAJORS: %d %d\n", brd->SerialDriver->major,
+		brd->PrintDriver->major));
+
+	return (rc);
+}
+
+
+/*
+ * dgap_tty_init()
+ *
+ * Init the tty subsystem.  Called once per board after board has been
+ * downloaded and init'ed.
+ */
+int dgap_tty_init(struct board_t *brd)
+{
+	int i;
+	int tlw;
+	uint true_count = 0;
+	uchar *vaddr;
+	uchar modem = 0;
+	struct channel_t *ch;
+	struct bs_t *bs;
+	struct cm_t *cm;
+
+	if (!brd)
+		return (-ENXIO);
+
+	DPR_INIT(("dgap_tty_init start\n"));
+
+	/*
+	 * Initialize board structure elements.
+	 */
+
+	vaddr = brd->re_map_membase;
+	true_count = readw((vaddr + NCHAN));
+
+	brd->nasync = dgap_config_get_number_of_ports(brd);
+
+	if (!brd->nasync) {
+		brd->nasync = brd->maxports;
+	}
+
+	if (brd->nasync > brd->maxports) {
+		brd->nasync = brd->maxports;
+	}
+
+	if (true_count != brd->nasync) {
+		if ((brd->type == PPCM) && (true_count == 64)) {
+			APR(("***WARNING**** %s configured for %d ports, has %d ports.\nPlease make SURE the EBI cable running from the card\nto each EM module is plugged into EBI IN!\n",
+				brd->name, brd->nasync, true_count));
+		}
+		else if ((brd->type == PPCM) && (true_count == 0)) {
+			APR(("***WARNING**** %s configured for %d ports, has %d ports.\nPlease make SURE the EBI cable running from the card\nto each EM module is plugged into EBI IN!\n",
+				brd->name, brd->nasync, true_count));
+		}
+		else {
+			APR(("***WARNING**** %s configured for %d ports, has %d ports.\n",
+				brd->name, brd->nasync, true_count));
+		}
+
+		brd->nasync = true_count;
+
+		/* If no ports, don't bother going any further */
+		if (!brd->nasync) {
+			brd->state = BOARD_FAILED;
+			brd->dpastatus = BD_NOFEP;
+			return(-ENXIO);
+		}
+	}
+
+	/*
+	 * Allocate channel memory that might not have been allocated
+	 * when the driver was first loaded.
+	 */
+	for (i = 0; i < brd->nasync; i++) {
+		if (!brd->channels[i]) {
+			brd->channels[i] = kzalloc(sizeof(struct channel_t), GFP_ATOMIC);
+			if (!brd->channels[i]) {
+				DPR_CORE(("%s:%d Unable to allocate memory for channel struct\n",
+				    __FILE__, __LINE__));
+			}
+		}
+	}
+
+	ch = brd->channels[0];
+	vaddr = brd->re_map_membase;
+
+	bs = (struct bs_t *) ((ulong) vaddr + CHANBUF);
+	cm = (struct cm_t *) ((ulong) vaddr + CMDBUF);
+
+	brd->bd_bs = bs;
+
+	/* Set up channel variables */
+	for (i = 0; i < brd->nasync; i++, ch = brd->channels[i], bs++) {
+
+		if (!brd->channels[i])
+			continue;
+
+		DGAP_SPINLOCK_INIT(ch->ch_lock);
+
+		/* Store all our magic numbers */
+		ch->magic = DGAP_CHANNEL_MAGIC;
+		ch->ch_tun.magic = DGAP_UNIT_MAGIC;
+		ch->ch_tun.un_type = DGAP_SERIAL;
+		ch->ch_tun.un_ch = ch;
+		ch->ch_tun.un_dev = i;
+
+		ch->ch_pun.magic = DGAP_UNIT_MAGIC;
+		ch->ch_pun.un_type = DGAP_PRINT;
+		ch->ch_pun.un_ch = ch;
+		ch->ch_pun.un_dev = i;
+
+		ch->ch_vaddr = vaddr;
+		ch->ch_bs = bs;
+		ch->ch_cm = cm;
+		ch->ch_bd = brd;
+		ch->ch_portnum = i;
+		ch->ch_digi = dgap_digi_init;
+
+		/*
+		 * Set up digi dsr and dcd bits based on altpin flag.
+		 */
+		if (dgap_config_get_altpin(brd)) {
+			ch->ch_dsr	= DM_CD;
+			ch->ch_cd	= DM_DSR;
+			ch->ch_digi.digi_flags |= DIGI_ALTPIN;
+		}
+		else {
+			ch->ch_cd	= DM_CD;
+			ch->ch_dsr	= DM_DSR;
+		}
+
+		ch->ch_taddr = vaddr + ((ch->ch_bs->tx_seg) << 4);
+		ch->ch_raddr = vaddr + ((ch->ch_bs->rx_seg) << 4);
+		ch->ch_tx_win = 0;
+		ch->ch_rx_win = 0;
+		ch->ch_tsize = readw(&(ch->ch_bs->tx_max)) + 1;
+		ch->ch_rsize = readw(&(ch->ch_bs->rx_max)) + 1;
+		ch->ch_tstart = 0;
+		ch->ch_rstart = 0;
+
+		/* .25 second delay */
+		ch->ch_close_delay = 250;
+
+		/*
+		 * Set queue water marks, interrupt mask,
+		 * and general tty parameters.
+		 */
+		ch->ch_tlw = tlw = ch->ch_tsize >= 2000 ? ((ch->ch_tsize * 5) / 8) : ch->ch_tsize / 2;
+
+		dgap_cmdw(ch, STLOW, tlw, 0);
+
+		dgap_cmdw(ch, SRLOW, ch->ch_rsize / 2, 0);
+
+		dgap_cmdw(ch, SRHIGH, 7 * ch->ch_rsize / 8, 0);
+
+		ch->ch_mistat = readb(&(ch->ch_bs->m_stat));
+
+		init_waitqueue_head(&ch->ch_flags_wait);
+		init_waitqueue_head(&ch->ch_tun.un_flags_wait);
+		init_waitqueue_head(&ch->ch_pun.un_flags_wait);
+		init_waitqueue_head(&ch->ch_sniff_wait);
+
+		/* Turn on all modem interrupts for now */
+		modem = (DM_CD | DM_DSR | DM_CTS | DM_RI);
+		writeb(modem, &(ch->ch_bs->m_int));
+
+		/*
+		 * Set edelay to 0 if interrupts are turned on,
+		 * otherwise set edelay to the usual 100.
+		 */
+		if (brd->intr_used)
+			writew(0, &(ch->ch_bs->edelay));
+		else
+			writew(100, &(ch->ch_bs->edelay));
+
+		writeb(1, &(ch->ch_bs->idata));
+	}
+
+
+	DPR_INIT(("dgap_tty_init finish\n"));
+
+	return (0);
+}
+
+
+/*
+ * dgap_tty_post_uninit()
+ *
+ * UnInitialize any global tty related data.
+ */
+void dgap_tty_post_uninit(void)
+{
+	kfree(dgap_TmpWriteBuf);
+	dgap_TmpWriteBuf = NULL;
+}
+
+
+/*
+ * dgap_tty_uninit()
+ *
+ * Uninitialize the TTY portion of this driver.  Free all memory and
+ * resources.
+ */
+void dgap_tty_uninit(struct board_t *brd)
+{
+	int i = 0;
+
+	if (brd->dgap_Major_Serial_Registered) {
+		dgap_BoardsByMajor[brd->SerialDriver->major] = NULL;
+		brd->dgap_Serial_Major = 0;
+		for (i = 0; i < brd->nasync; i++) {
+			dgap_remove_tty_sysfs(brd->channels[i]->ch_tun.un_sysfs);
+			tty_unregister_device(brd->SerialDriver, i);
+		}
+		tty_unregister_driver(brd->SerialDriver);
+		kfree(brd->SerialDriver->ttys);
+		brd->SerialDriver->ttys = NULL;
+		put_tty_driver(brd->SerialDriver);
+		brd->dgap_Major_Serial_Registered = FALSE;
+	}
+
+	if (brd->dgap_Major_TransparentPrint_Registered) {
+		dgap_BoardsByMajor[brd->PrintDriver->major] = NULL;
+		brd->dgap_TransparentPrint_Major = 0;
+		for (i = 0; i < brd->nasync; i++) {
+			dgap_remove_tty_sysfs(brd->channels[i]->ch_pun.un_sysfs);
+			tty_unregister_device(brd->PrintDriver, i);
+		}
+		tty_unregister_driver(brd->PrintDriver);
+		kfree(brd->PrintDriver->ttys);
+		brd->PrintDriver->ttys = NULL;
+		put_tty_driver(brd->PrintDriver);
+		brd->dgap_Major_TransparentPrint_Registered = FALSE;
+	}
+}
+
+
+#define TMPBUFLEN (1024)
+
+/*
+ * dgap_sniff - Dump data out to the "sniff" buffer if the
+ * proc sniff file is opened...
+ */
+static void dgap_sniff_nowait_nolock(struct channel_t *ch, uchar *text, uchar *buf, int len)
+{
+	struct timeval tv;
+	int n;
+	int r;
+	int nbuf;
+	int i;
+	int tmpbuflen;
+	char tmpbuf[TMPBUFLEN];
+	char *p = tmpbuf;
+	int too_much_data;
+
+	/* Leave if sniff not open */
+	if (!(ch->ch_sniff_flags & SNIFF_OPEN))
+		return;
+
+	do_gettimeofday(&tv);
+
+	/* Create our header for data dump */
+	p += sprintf(p, "<%ld %ld><%s><", tv.tv_sec, tv.tv_usec, text);
+	tmpbuflen = p - tmpbuf;
+
+	do {
+		too_much_data = 0;
+
+		for (i = 0; i < len && tmpbuflen < (TMPBUFLEN - 4); i++) {
+			p += sprintf(p, "%02x ", *buf);
+			buf++;
+			tmpbuflen = p - tmpbuf;
+		}
+
+		if (tmpbuflen < (TMPBUFLEN - 4)) {
+			if (i > 0)
+				p += sprintf(p - 1, "%s\n", ">");
+			else
+				p += sprintf(p, "%s\n", ">");
+		} else {
+			too_much_data = 1;
+			len -= i;
+		}
+
+		nbuf = strlen(tmpbuf);
+		p = tmpbuf;
+
+		/*
+		 *  Loop while data remains.
+		 */
+		while (nbuf > 0 && ch->ch_sniff_buf) {
+			/*
+			 *  Determine the amount of available space left in the
+			 *  buffer.  If there's none, wait until some appears.
+			 */
+			n = (ch->ch_sniff_out - ch->ch_sniff_in - 1) & SNIFF_MASK;
+
+			/*
+			 * If there is no space left to write to in our sniff buffer,
+			 * we have no choice but to drop the data.
+			 * We *cannot* sleep here waiting for space, because this
+			 * function was probably called by the interrupt/timer routines!
+			 */
+			if (n == 0) {
+				return;
+			}
+
+			/*
+			 * Copy as much data as will fit.
+			 */
+
+			if (n > nbuf)
+				n = nbuf;
+
+			r = SNIFF_MAX - ch->ch_sniff_in;
+
+			if (r <= n) {
+				memcpy(ch->ch_sniff_buf + ch->ch_sniff_in, p, r);
+
+				n -= r;
+				ch->ch_sniff_in = 0;
+				p += r;
+				nbuf -= r;
+			}
+
+			memcpy(ch->ch_sniff_buf + ch->ch_sniff_in, p, n);
+
+			ch->ch_sniff_in += n;
+			p += n;
+			nbuf -= n;
+
+			/*
+			 *  Wakeup any thread waiting for data
+			 */
+			if (ch->ch_sniff_flags & SNIFF_WAIT_DATA) {
+				ch->ch_sniff_flags &= ~SNIFF_WAIT_DATA;
+				wake_up_interruptible(&ch->ch_sniff_wait);
+			}
+		}
+
+		/*
+		 * If the user sent us too much data to push into our tmpbuf,
+		 * we need to keep looping around on all the data.
+		 */
+		if (too_much_data) {
+			p = tmpbuf;
+			tmpbuflen = 0;
+		}
+
+	} while (too_much_data);
+}
+
+
+/*=======================================================================
+ *
+ *      dgap_input - Process received data.
+ *
+ *              ch      - Pointer to channel structure.
+ *
+ *=======================================================================*/
+
+void dgap_input(struct channel_t *ch)
+{
+	struct board_t *bd;
+	struct bs_t	*bs;
+	struct tty_struct *tp;
+	struct tty_ldisc *ld;
+	uint	rmask;
+	uint	head;
+	uint	tail;
+	int	data_len;
+	ulong	lock_flags;
+	ulong   lock_flags2;
+	int flip_len;
+	int len = 0;
+	int n = 0;
+	uchar *buf;
+	uchar tmpchar;
+	int s = 0;
+
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return;
+
+	tp = ch->ch_tun.un_tty;
+
+	bs  = ch->ch_bs;
+	if (!bs) {
+		return;
+	}
+
+	bd = ch->ch_bd;
+	if(!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_READ(("dgap_input start\n"));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	/*
+	 *      Figure the number of characters in the buffer.
+	 *      Exit immediately if none.
+	 */
+
+	rmask = ch->ch_rsize - 1;
+
+	head = readw(&(bs->rx_head));
+	head &= rmask;
+	tail = readw(&(bs->rx_tail));
+	tail &= rmask;
+
+	data_len = (head - tail) & rmask;
+
+	if (data_len == 0) {
+		writeb(1, &(bs->idata));
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		DPR_READ(("No data on port %d\n", ch->ch_portnum));
+		return;
+	}
+
+	/*
+	 * If the device is not open, or CREAD is off, flush
+	 * input data and return immediately.
+	 */
+	if ((bd->state != BOARD_READY) || !tp  || (tp->magic != TTY_MAGIC) ||
+            !(ch->ch_tun.un_flags & UN_ISOPEN) || !(tp->termios.c_cflag & CREAD) ||
+	    (ch->ch_tun.un_flags & UN_CLOSING)) {
+
+		DPR_READ(("input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum));
+		DPR_READ(("input. tp: %p tp->magic: %x MAGIC:%x ch flags: %x\n",
+			tp, tp ? tp->magic : 0, TTY_MAGIC, ch->ch_tun.un_flags));
+		writew(head, &(bs->rx_tail));
+		writeb(1, &(bs->idata));
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return;
+	}
+
+	/*
+	 * If we are throttled, simply don't read any data.
+	 */
+	if (ch->ch_flags & CH_RXBLOCK) {
+		writeb(1, &(bs->idata));
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		DPR_READ(("Port %d throttled, not reading any data. head: %x tail: %x\n",
+			ch->ch_portnum, head, tail));
+		return;
+	}
+
+	/*
+	 *      Ignore oruns.
+	 */
+	tmpchar = readb(&(bs->orun));
+	if (tmpchar) {
+		ch->ch_err_overrun++;
+		writeb(0, &(bs->orun));
+	}
+
+	DPR_READ(("dgap_input start 2\n"));
+
+	/* Decide how much data we can send into the tty layer */
+	flip_len = TTY_FLIPBUF_SIZE;
+
+	/* Chop down the length, if needed */
+	len = min(data_len, flip_len);
+	len = min(len, (N_TTY_BUF_SIZE - 1));
+
+	ld = tty_ldisc_ref(tp);
+
+#ifdef TTY_DONT_FLIP
+	/*
+	 * If the DONT_FLIP flag is on, don't flush our buffer, and act
+	 * like the ld doesn't have any space to put the data right now.
+	 */
+	if (test_bit(TTY_DONT_FLIP, &tp->flags))
+		len = 0;
+#endif
+
+	/*
+	 * If we were unable to get a reference to the ld,
+	 * don't flush our buffer, and act like the ld doesn't
+	 * have any space to put the data right now.
+	 */
+	if (!ld) {
+		len = 0;
+	} else {
+		/*
+		 * If ld doesn't have a pointer to a receive_buf function,
+		 * flush the data, then act like the ld doesn't have any
+		 * space to put the data right now.
+		 */
+		if (!ld->ops->receive_buf) {
+			writew(head, &(bs->rx_tail));
+			len = 0;
+		}
+	}
+
+	if (len <= 0) {
+		writeb(1, &(bs->idata));
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		DPR_READ(("dgap_input 1 - finish\n"));
+		if (ld)
+			tty_ldisc_deref(ld);
+		return;
+	}
+
+	buf = ch->ch_bd->flipbuf;
+	n = len;
+
+	/*
+	 * n now contains the most amount of data we can copy,
+	 * bounded either by our buffer size or the amount
+	 * of data the card actually has pending...
+	 */
+	while (n) {
+
+		s = ((head >= tail) ? head : ch->ch_rsize) - tail;
+		s = min(s, n);
+
+		if (s <= 0)
+			break;
+
+		memcpy_fromio(buf, (char *) ch->ch_raddr + tail, s);
+		dgap_sniff_nowait_nolock(ch, "USER READ", buf, s);
+
+		tail += s;
+		buf += s;
+
+		n -= s;
+		/* Flip queue if needed */
+		tail &= rmask;
+	}
+
+	writew(tail, &(bs->rx_tail));
+	writeb(1, &(bs->idata));
+	ch->ch_rxcount += len;
+
+	/*
+	 * If we are completely raw, we don't need to go through a lot
+	 * of the tty layers that exist.
+	 * In this case, we take the shortest and fastest route we
+	 * can to relay the data to the user.
+	 *
+	 * On the other hand, if we are not raw, we need to go through
+	 * the tty layer, which has its API more well defined.
+	 */
+	if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
+		dgap_parity_scan(ch, ch->ch_bd->flipbuf, ch->ch_bd->flipflagbuf, &len);
+
+		len = tty_buffer_request_room(tp->port, len);
+		tty_insert_flip_string_flags(tp->port, ch->ch_bd->flipbuf,
+			ch->ch_bd->flipflagbuf, len);
+	}
+	else {
+		len = tty_buffer_request_room(tp->port, len);
+		tty_insert_flip_string(tp->port, ch->ch_bd->flipbuf, len);
+	}
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	/* Tell the tty layer its okay to "eat" the data now */
+	tty_flip_buffer_push(tp->port);
+
+	if (ld)
+		tty_ldisc_deref(ld);
+
+	DPR_READ(("dgap_input - finish\n"));
+}
+
+
+/************************************************************************
+ * Determines when CARRIER changes state and takes appropriate
+ * action.
+ ************************************************************************/
+void dgap_carrier(struct channel_t *ch)
+{
+	struct board_t *bd;
+
+        int virt_carrier = 0;
+        int phys_carrier = 0;
+
+	DPR_CARR(("dgap_carrier called...\n"));
+
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return;
+
+	bd = ch->ch_bd;
+
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	/* Make sure altpin is always set correctly */
+	if (ch->ch_digi.digi_flags & DIGI_ALTPIN) {
+		ch->ch_dsr      = DM_CD;
+		ch->ch_cd       = DM_DSR;
+	}
+	else {
+		ch->ch_dsr      = DM_DSR;
+		ch->ch_cd       = DM_CD;
+	}
+
+	if (ch->ch_mistat & D_CD(ch)) {
+		DPR_CARR(("mistat: %x  D_CD: %x\n", ch->ch_mistat, D_CD(ch)));
+		phys_carrier = 1;
+	}
+
+	if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) {
+		virt_carrier = 1;
+	}
+
+	if (ch->ch_c_cflag & CLOCAL) {
+		virt_carrier = 1;
+	}
+
+
+	DPR_CARR(("DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier));
+
+	/*
+	 * Test for a VIRTUAL carrier transition to HIGH.
+	 */
+	if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
+
+		/*
+		 * When carrier rises, wake any threads waiting
+		 * for carrier in the open routine.
+		 */
+
+		DPR_CARR(("carrier: virt DCD rose\n"));
+
+		if (waitqueue_active(&(ch->ch_flags_wait)))
+			wake_up_interruptible(&ch->ch_flags_wait);
+	}
+
+	/*
+	 * Test for a PHYSICAL carrier transition to HIGH.
+	 */
+	if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
+
+		/*
+		 * When carrier rises, wake any threads waiting
+		 * for carrier in the open routine.
+		 */
+
+		DPR_CARR(("carrier: physical DCD rose\n"));
+
+		if (waitqueue_active(&(ch->ch_flags_wait)))
+			wake_up_interruptible(&ch->ch_flags_wait);
+	}
+
+	/*
+	 *  Test for a PHYSICAL transition to low, so long as we aren't
+	 *  currently ignoring physical transitions (which is what "virtual
+	 *  carrier" indicates).
+	 *
+	 *  The transition of the virtual carrier to low really doesn't
+	 *  matter... it really only means "ignore carrier state", not
+	 *  "make pretend that carrier is there".
+	 */
+	if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) &&
+	    (phys_carrier == 0))
+	{
+
+		/*
+		 *   When carrier drops:
+		 *
+		 *   Drop carrier on all open units.
+		 *
+		 *   Flush queues, waking up any task waiting in the
+		 *   line discipline.
+		 *
+		 *   Send a hangup to the control terminal.
+		 *
+		 *   Enable all select calls.
+		 */
+		if (waitqueue_active(&(ch->ch_flags_wait)))
+			wake_up_interruptible(&ch->ch_flags_wait);
+
+		if (ch->ch_tun.un_open_count > 0) {
+			DPR_CARR(("Sending tty hangup\n"));
+			tty_hangup(ch->ch_tun.un_tty);
+		}
+
+		if (ch->ch_pun.un_open_count > 0) {
+			DPR_CARR(("Sending pr hangup\n"));
+			tty_hangup(ch->ch_pun.un_tty);
+		}
+	}
+
+	/*
+	 *  Make sure that our cached values reflect the current reality.
+	 */
+	if (virt_carrier == 1)
+		ch->ch_flags |= CH_FCAR;
+	else
+		ch->ch_flags &= ~CH_FCAR;
+
+	if (phys_carrier == 1)
+		ch->ch_flags |= CH_CD;
+	else
+		ch->ch_flags &= ~CH_CD;
+}
+
+
+/************************************************************************
+ *
+ * TTY Entry points and helper functions
+ *
+ ************************************************************************/
+
+/*
+ * dgap_tty_open()
+ *
+ */
+static int dgap_tty_open(struct tty_struct *tty, struct file *file)
+{
+	struct board_t	*brd;
+	struct channel_t *ch;
+	struct un_t	*un;
+	struct bs_t	*bs;
+	uint		major = 0;
+	uint		minor = 0;
+	int		rc = 0;
+	ulong		lock_flags;
+	ulong		lock_flags2;
+	u16		head;
+
+	rc = 0;
+
+	major = MAJOR(tty_devnum(tty));
+	minor = MINOR(tty_devnum(tty));
+
+	if (major > 255) {
+		return -ENXIO;
+	}
+
+	/* Get board pointer from our array of majors we have allocated */
+	brd = dgap_BoardsByMajor[major];
+	if (!brd) {
+		return -ENXIO;
+	}
+
+	/*
+	 * If board is not yet up to a state of READY, go to
+	 * sleep waiting for it to happen or they cancel the open.
+	 */
+	rc = wait_event_interruptible(brd->state_wait,
+		(brd->state & BOARD_READY));
+
+	if (rc) {
+		return rc;
+	}
+
+	DGAP_LOCK(brd->bd_lock, lock_flags);
+
+	/* The wait above should guarantee this cannot happen */
+	if (brd->state != BOARD_READY) {
+		DGAP_UNLOCK(brd->bd_lock, lock_flags);
+		return -ENXIO;
+	}
+
+	/* If opened device is greater than our number of ports, bail. */
+	if (MINOR(tty_devnum(tty)) > brd->nasync) {
+		DGAP_UNLOCK(brd->bd_lock, lock_flags);
+		return -ENXIO;
+	}
+
+	ch = brd->channels[minor];
+	if (!ch) {
+		DGAP_UNLOCK(brd->bd_lock, lock_flags);
+		return -ENXIO;
+	}
+
+	/* Grab channel lock */
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	/* Figure out our type */
+	if (major == brd->dgap_Serial_Major) {
+		un = &brd->channels[minor]->ch_tun;
+		un->un_type = DGAP_SERIAL;
+	}
+	else if (major == brd->dgap_TransparentPrint_Major) {
+		un = &brd->channels[minor]->ch_pun;
+		un->un_type = DGAP_PRINT;
+	}
+	else {
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(brd->bd_lock, lock_flags);
+		DPR_OPEN(("%d Unknown TYPE!\n", __LINE__));
+		return -ENXIO;
+	}
+
+	/* Store our unit into driver_data, so we always have it available. */
+	tty->driver_data = un;
+
+	DPR_OPEN(("Open called. MAJOR: %d MINOR:%d unit: %p NAME: %s\n",
+		MAJOR(tty_devnum(tty)), MINOR(tty_devnum(tty)), un, brd->name));
+
+	/*
+	 * Error if channel info pointer is NULL.
+	 */
+	bs = ch->ch_bs;
+	if (!bs) {
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(brd->bd_lock, lock_flags);
+		DPR_OPEN(("%d BS is 0!\n", __LINE__));
+		return -ENXIO;
+        }
+
+	DPR_OPEN(("%d: tflag=%x  pflag=%x\n", __LINE__, ch->ch_tun.un_flags, ch->ch_pun.un_flags));
+
+	/*
+	 * Initialize tty's
+	 */
+	if (!(un->un_flags & UN_ISOPEN)) {
+		/* Store important variables. */
+		un->un_tty     = tty;
+
+		/* Maybe do something here to the TTY struct as well? */
+	}
+
+	/*
+	 * Initialize if neither terminal or printer is open.
+	 */
+	if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) {
+
+		DPR_OPEN(("dgap_open: initializing channel in open...\n"));
+
+		ch->ch_mforce = 0;
+		ch->ch_mval = 0;
+
+		/*
+		 * Flush input queue.
+		 */
+		head = readw(&(bs->rx_head));
+		writew(head, &(bs->rx_tail));
+
+		ch->ch_flags = 0;
+		ch->pscan_state = 0;
+		ch->pscan_savechar = 0;
+
+		ch->ch_c_cflag   = tty->termios.c_cflag;
+		ch->ch_c_iflag   = tty->termios.c_iflag;
+		ch->ch_c_oflag   = tty->termios.c_oflag;
+		ch->ch_c_lflag   = tty->termios.c_lflag;
+		ch->ch_startc = tty->termios.c_cc[VSTART];
+		ch->ch_stopc  = tty->termios.c_cc[VSTOP];
+
+		/* TODO: flush our TTY struct here? */
+	}
+
+	dgap_carrier(ch);
+	/*
+	 * Run param in case we changed anything
+	 */
+	dgap_param(tty);
+
+	/*
+	 * follow protocol for opening port
+	 */
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(brd->bd_lock, lock_flags);
+
+	rc = dgap_block_til_ready(tty, file, ch);
+
+	if (!un->un_tty) {
+		return -ENODEV;
+	}
+
+	if (rc) {
+		DPR_OPEN(("dgap_tty_open returning after dgap_block_til_ready "
+			"with %d\n", rc));
+	}
+
+	/* No going back now, increment our unit and channel counters */
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+	ch->ch_open_count++;
+	un->un_open_count++;
+	un->un_flags |= (UN_ISOPEN);
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	DPR_OPEN(("dgap_tty_open finished\n"));
+	return (rc);
+}
+
+
+/*
+ * dgap_block_til_ready()
+ *
+ * Wait for DCD, if needed.
+ */
+static int dgap_block_til_ready(struct tty_struct *tty, struct file *file, struct channel_t *ch)
+{
+	int retval = 0;
+	struct un_t *un = NULL;
+	ulong   lock_flags;
+	uint	old_flags = 0;
+	int sleep_on_un_flags = 0;
+
+	if (!tty || tty->magic != TTY_MAGIC || !file || !ch || ch->magic != DGAP_CHANNEL_MAGIC) {
+		return (-ENXIO);
+	}
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC) {
+		return (-ENXIO);
+	}
+
+	DPR_OPEN(("dgap_block_til_ready - before block.\n"));
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+
+	ch->ch_wopen++;
+
+	/* Loop forever */
+	while (1) {
+
+		sleep_on_un_flags = 0;
+
+		/*
+		 * If board has failed somehow during our sleep, bail with error.
+		 */
+		if (ch->ch_bd->state == BOARD_FAILED) {
+			retval = -ENXIO;
+			break;
+		}
+
+		/* If tty was hung up, break out of loop and set error. */
+		if (tty_hung_up_p(file)) {
+			retval = -EAGAIN;
+			break;
+		}
+
+		/*
+		 * If either unit is in the middle of the fragile part of close,
+		 * we just cannot touch the channel safely.
+		 * Go back to sleep, knowing that when the channel can be
+		 * touched safely, the close routine will signal the
+		 * ch_wait_flags to wake us back up.
+		 */
+		if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_CLOSING)) {
+
+			/*
+			 * Our conditions to leave cleanly and happily:
+			 * 1) NONBLOCKING on the tty is set.
+			 * 2) CLOCAL is set.
+			 * 3) DCD (fake or real) is active.
+			 */
+
+			if (file->f_flags & O_NONBLOCK) {
+				break;
+			}
+
+			if (tty->flags & (1 << TTY_IO_ERROR)) {
+				break;
+			}
+
+			if (ch->ch_flags & CH_CD) {
+				DPR_OPEN(("%d: ch_flags: %x\n", __LINE__, ch->ch_flags));
+				break;
+			}
+
+			if (ch->ch_flags & CH_FCAR) {
+				DPR_OPEN(("%d: ch_flags: %x\n", __LINE__, ch->ch_flags));
+				break;
+			}
+		}
+		else {
+			sleep_on_un_flags = 1;
+		}
+
+		/*
+		 * If there is a signal pending, the user probably
+		 * interrupted (ctrl-c) us.
+		 * Leave loop with error set.
+		 */
+		if (signal_pending(current)) {
+			DPR_OPEN(("%d: signal pending...\n", __LINE__));
+			retval = -ERESTARTSYS;
+			break;
+		}
+
+		DPR_OPEN(("dgap_block_til_ready - blocking.\n"));
+
+		/*
+		 * Store the flags before we let go of channel lock
+		 */
+		if (sleep_on_un_flags)
+			old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags;
+		else
+			old_flags = ch->ch_flags;
+
+		/*
+		 * Let go of channel lock before calling schedule.
+		 * Our poller will get any FEP events and wake us up when DCD
+		 * eventually goes active.
+		 */
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+		DPR_OPEN(("Going to sleep on %s flags...\n",
+			(sleep_on_un_flags ? "un" : "ch")));
+
+		/*
+		 * Wait for something in the flags to change from the current value.
+		 */
+		if (sleep_on_un_flags) {
+			retval = wait_event_interruptible(un->un_flags_wait,
+				(old_flags != (ch->ch_tun.un_flags | ch->ch_pun.un_flags)));
+		}
+		else {
+			retval = wait_event_interruptible(ch->ch_flags_wait,
+				(old_flags != ch->ch_flags));
+		}
+
+		DPR_OPEN(("After sleep... retval: %x\n", retval));
+
+		/*
+		 * We got woken up for some reason.
+		 * Before looping around, grab our channel lock.
+		 */
+		DGAP_LOCK(ch->ch_lock, lock_flags);
+	}
+
+	ch->ch_wopen--;
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	DPR_OPEN(("dgap_block_til_ready - after blocking.\n"));
+
+	if (retval) {
+		DPR_OPEN(("dgap_block_til_ready - done. error. retval: %x\n", retval));
+		return(retval);
+	}
+
+	DPR_OPEN(("dgap_block_til_ready - done no error. jiffies: %lu\n", jiffies));
+
+	return(0);
+}
+
+
+/*
+ * dgap_tty_hangup()
+ *
+ * Hangup the port.  Like a close, but don't wait for output to drain.
+ */
+static void dgap_tty_hangup(struct tty_struct *tty)
+{
+	struct board_t	*bd;
+	struct channel_t *ch;
+	struct un_t	*un;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_CLOSE(("dgap_hangup called. ch->ch_open_count: %d un->un_open_count: %d\n",
+		ch->ch_open_count, un->un_open_count));
+
+	/* flush the transmit queues */
+	dgap_tty_flush_buffer(tty);
+
+	DPR_CLOSE(("dgap_hangup finished. ch->ch_open_count: %d un->un_open_count: %d\n",
+		ch->ch_open_count, un->un_open_count));
+}
+
+
+
+/*
+ * dgap_tty_close()
+ *
+ */
+static void dgap_tty_close(struct tty_struct *tty, struct file *file)
+{
+	struct ktermios *ts;
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	ulong lock_flags;
+	int rc = 0;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	ts = &tty->termios;
+
+	DPR_CLOSE(("Close called\n"));
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+
+	/*
+	 * Determine if this is the last close or not - and if we agree about
+	 * which type of close it is with the Line Discipline
+	 */
+	if ((tty->count == 1) && (un->un_open_count != 1)) {
+		/*
+		 * Uh, oh.  tty->count is 1, which means that the tty
+		 * structure will be freed.  un_open_count should always
+		 * be one in these conditions.  If it's greater than
+		 * one, we've got real problems, since it means the
+		 * serial port won't be shutdown.
+		 */
+		APR(("tty->count is 1, un open count is %d\n", un->un_open_count));
+		un->un_open_count = 1;
+	}
+
+	if (--un->un_open_count < 0) {
+		APR(("bad serial port open count of %d\n", un->un_open_count));
+		un->un_open_count = 0;
+	}
+
+	ch->ch_open_count--;
+
+	if (ch->ch_open_count && un->un_open_count) {
+		DPR_CLOSE(("dgap_tty_close: not last close ch: %d un:%d\n",
+			ch->ch_open_count, un->un_open_count));
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+                return;
+        }
+
+	/* OK, its the last close on the unit */
+	DPR_CLOSE(("dgap_tty_close - last close on unit procedures\n"));
+
+	un->un_flags |= UN_CLOSING;
+
+	tty->closing = 1;
+
+	/*
+	 * Only officially close channel if count is 0 and
+         * DIGI_PRINTER bit is not set.
+	 */
+	if ((ch->ch_open_count == 0) && !(ch->ch_digi.digi_flags & DIGI_PRINTER)) {
+
+		ch->ch_flags &= ~(CH_RXBLOCK);
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+		/* wait for output to drain */
+		/* This will also return if we take an interrupt */
+
+		DPR_CLOSE(("Calling wait_for_drain\n"));
+		rc = dgap_wait_for_drain(tty);
+		DPR_CLOSE(("After calling wait_for_drain\n"));
+
+		if (rc) {
+			DPR_BASIC(("dgap_tty_close - bad return: %d ", rc));
+		}
+
+		dgap_tty_flush_buffer(tty);
+		tty_ldisc_flush(tty);
+
+		DGAP_LOCK(ch->ch_lock, lock_flags);
+
+		tty->closing = 0;
+
+		/*
+		 * If we have HUPCL set, lower DTR and RTS
+		 */
+		if (ch->ch_c_cflag & HUPCL ) {
+			DPR_CLOSE(("Close. HUPCL set, dropping DTR/RTS\n"));
+			ch->ch_mostat &= ~(D_RTS(ch)|D_DTR(ch));
+			dgap_cmdb( ch, SMODEM, 0, D_DTR(ch)|D_RTS(ch), 0 );
+
+			/*
+			 * Go to sleep to ensure RTS/DTR
+			 * have been dropped for modems to see it.
+			 */
+			if (ch->ch_close_delay) {
+				DPR_CLOSE(("Close. Sleeping for RTS/DTR drop\n"));
+
+				DGAP_UNLOCK(ch->ch_lock, lock_flags);
+				dgap_ms_sleep(ch->ch_close_delay);
+				DGAP_LOCK(ch->ch_lock, lock_flags);
+
+				DPR_CLOSE(("Close. After sleeping for RTS/DTR drop\n"));
+			}
+		}
+
+		ch->pscan_state = 0;
+		ch->pscan_savechar = 0;
+		ch->ch_baud_info = 0;
+
+	}
+
+	/*
+	 * turn off print device when closing print device.
+	 */
+	if ((un->un_type == DGAP_PRINT)  && (ch->ch_flags & CH_PRON) ) {
+		dgap_wmove(ch, ch->ch_digi.digi_offstr,
+			(int) ch->ch_digi.digi_offlen);
+		ch->ch_flags &= ~CH_PRON;
+	}
+
+	un->un_tty = NULL;
+	un->un_flags &= ~(UN_ISOPEN | UN_CLOSING);
+	tty->driver_data = NULL;
+
+	DPR_CLOSE(("Close. Doing wakeups\n"));
+	wake_up_interruptible(&ch->ch_flags_wait);
+	wake_up_interruptible(&un->un_flags_wait);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+        DPR_BASIC(("dgap_tty_close - complete\n"));
+}
+
+
+/*
+ * dgap_tty_chars_in_buffer()
+ *
+ * Return number of characters that have not been transmitted yet.
+ *
+ * This routine is used by the line discipline to determine if there
+ * is data waiting to be transmitted/drained/flushed or not.
+ */
+static int dgap_tty_chars_in_buffer(struct tty_struct *tty)
+{
+	struct board_t *bd = NULL;
+	struct channel_t *ch = NULL;
+	struct un_t *un = NULL;
+	struct bs_t *bs = NULL;
+	uchar tbusy;
+	uint chars = 0;
+	u16 thead, ttail, tmask, chead, ctail;
+	ulong   lock_flags = 0;
+	ulong   lock_flags2 = 0;
+
+	if (tty == NULL)
+		return(0);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (0);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (0);
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return (0);
+
+        bs = ch->ch_bs;
+	if (!bs)
+		return (0);
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	tmask = (ch->ch_tsize - 1);
+
+	/* Get Transmit queue pointers */
+	thead = readw(&(bs->tx_head)) & tmask;
+	ttail = readw(&(bs->tx_tail)) & tmask;
+
+	/* Get tbusy flag */
+	tbusy = readb(&(bs->tbusy));
+
+	/* Get Command queue pointers */
+	chead = readw(&(ch->ch_cm->cm_head));
+	ctail = readw(&(ch->ch_cm->cm_tail));
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	/*
+	 * The only way we know for sure if there is no pending
+	 * data left to be transferred, is if:
+	 * 1) Transmit head and tail are equal (empty).
+	 * 2) Command queue head and tail are equal (empty).
+	 * 3) The "TBUSY" flag is 0. (Transmitter not busy).
+ 	 */
+
+	if ((ttail == thead) && (tbusy == 0) && (chead == ctail)) {
+		chars = 0;
+	}
+	else {
+		if (thead >= ttail)
+			chars = thead - ttail;
+		else
+			chars = thead - ttail + ch->ch_tsize;
+		/*
+		 * Fudge factor here.
+		 * If chars is zero, we know that the command queue had
+		 * something in it or tbusy was set.  Because we cannot
+		 * be sure if there is still some data to be transmitted,
+		 * lets lie, and tell ld we have 1 byte left.
+		 */
+		if (chars == 0) {
+			/*
+			 * If TBUSY is still set, and our tx buffers are empty,
+			 * force the firmware to send me another wakeup after
+			 * TBUSY has been cleared.
+			 */
+			if (tbusy != 0) {
+				DGAP_LOCK(ch->ch_lock, lock_flags);
+				un->un_flags |= UN_EMPTY;
+				writeb(1, &(bs->iempty));
+				DGAP_UNLOCK(ch->ch_lock, lock_flags);
+			}
+			chars = 1;
+		}
+	}
+
+ 	DPR_WRITE(("dgap_tty_chars_in_buffer. Port: %x - %d (head: %d tail: %d tsize: %d)\n",
+		ch->ch_portnum, chars, thead, ttail, ch->ch_tsize));
+        return(chars);
+}
+
+
+static int dgap_wait_for_drain(struct tty_struct *tty)
+{
+	struct channel_t *ch;
+	struct un_t *un;
+	struct bs_t *bs;
+	int ret = -EIO;
+	uint count = 1;
+	ulong   lock_flags = 0;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return ret;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return ret;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return ret;
+
+        bs = ch->ch_bs;
+	if (!bs)
+		return ret;
+
+	ret = 0;
+
+	DPR_DRAIN(("dgap_wait_for_drain start\n"));
+
+	/* Loop until data is drained */
+	while (count != 0) {
+
+		count = dgap_tty_chars_in_buffer(tty);
+
+		if (count == 0)
+			break;
+
+		/* Set flag waiting for drain */
+		DGAP_LOCK(ch->ch_lock, lock_flags);
+		un->un_flags |= UN_EMPTY;
+		writeb(1, &(bs->iempty));
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+		/* Go to sleep till we get woken up */
+		ret = wait_event_interruptible(un->un_flags_wait, ((un->un_flags & UN_EMPTY) == 0));
+		/* If ret is non-zero, user ctrl-c'ed us */
+		if (ret) {
+			break;
+		}
+	}
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+	un->un_flags &= ~(UN_EMPTY);
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	DPR_DRAIN(("dgap_wait_for_drain finish\n"));
+	return (ret);
+}
+
+
+/*
+ * dgap_maxcps_room
+ *
+ * Reduces bytes_available to the max number of characters
+ * that can be sent currently given the maxcps value, and
+ * returns the new bytes_available.  This only affects printer
+ * output.
+ */
+static int dgap_maxcps_room(struct tty_struct *tty, int bytes_available)
+{
+	struct channel_t *ch = NULL;
+	struct un_t *un = NULL;
+
+	if (tty == NULL)
+		return (bytes_available);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (bytes_available);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (bytes_available);
+
+	/*
+	 * If its not the Transparent print device, return
+	 * the full data amount.
+	 */
+	if (un->un_type != DGAP_PRINT)
+		return (bytes_available);
+
+	if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0 ) {
+		int cps_limit = 0;
+		unsigned long current_time = jiffies;
+		unsigned long buffer_time = current_time +
+			(HZ * ch->ch_digi.digi_bufsize) / ch->ch_digi.digi_maxcps;
+
+		if (ch->ch_cpstime < current_time) {
+			/* buffer is empty */
+			ch->ch_cpstime = current_time;            /* reset ch_cpstime */
+			cps_limit = ch->ch_digi.digi_bufsize;
+		}
+		else if (ch->ch_cpstime < buffer_time) {
+			/* still room in the buffer */
+			cps_limit = ((buffer_time - ch->ch_cpstime) * ch->ch_digi.digi_maxcps) / HZ;
+		}
+		else {
+			/* no room in the buffer */
+			cps_limit = 0;
+		}
+
+		bytes_available = min(cps_limit, bytes_available);
+	}
+
+	return (bytes_available);
+}
+
+
+static inline void dgap_set_firmware_event(struct un_t *un, unsigned int event)
+{
+	struct channel_t *ch = NULL;
+	struct bs_t *bs = NULL;
+
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return;
+        bs = ch->ch_bs;
+	if (!bs)
+		return;
+
+	if ((event & UN_LOW) != 0) {
+		if ((un->un_flags & UN_LOW) == 0) {
+			un->un_flags |= UN_LOW;
+			writeb(1, &(bs->ilow));
+		}
+	}
+	if ((event & UN_LOW) != 0) {
+		if ((un->un_flags & UN_EMPTY) == 0) {
+			un->un_flags |= UN_EMPTY;
+			writeb(1, &(bs->iempty));
+		}
+	}
+}
+
+
+/*
+ * dgap_tty_write_room()
+ *
+ * Return space available in Tx buffer
+ */
+static int dgap_tty_write_room(struct tty_struct *tty)
+{
+	struct channel_t *ch = NULL;
+	struct un_t *un = NULL;
+	struct bs_t *bs = NULL;
+	u16 head, tail, tmask;
+	int ret = 0;
+	ulong   lock_flags = 0;
+
+	if (tty == NULL || dgap_TmpWriteBuf == NULL)
+		return(0);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (0);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (0);
+
+        bs = ch->ch_bs;
+	if (!bs)
+		return (0);
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+
+	tmask = ch->ch_tsize - 1;
+	head = readw(&(bs->tx_head)) & tmask;
+	tail = readw(&(bs->tx_tail)) & tmask;
+
+        if ((ret = tail - head - 1) < 0)
+                ret += ch->ch_tsize;
+
+	/* Limit printer to maxcps */
+	ret = dgap_maxcps_room(tty, ret);
+
+	/*
+	 * If we are printer device, leave space for
+	 * possibly both the on and off strings.
+	 */
+	if (un->un_type == DGAP_PRINT) {
+		if (!(ch->ch_flags & CH_PRON))
+			ret -= ch->ch_digi.digi_onlen;
+		ret -= ch->ch_digi.digi_offlen;
+	}
+	else {
+		if (ch->ch_flags & CH_PRON)
+			ret -= ch->ch_digi.digi_offlen;
+	}
+
+	if (ret < 0)
+		ret = 0;
+
+	/*
+	 * Schedule FEP to wake us up if needed.
+	 *
+	 * TODO:  This might be overkill...
+	 * Do we really need to schedule callbacks from the FEP
+	 * in every case?  Can we get smarter based on ret?
+	 */
+	dgap_set_firmware_event(un, UN_LOW | UN_EMPTY);
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	DPR_WRITE(("dgap_tty_write_room - %d tail: %d head: %d\n", ret, tail, head));
+
+        return(ret);
+}
+
+
+/*
+ * dgap_tty_put_char()
+ *
+ * Put a character into ch->ch_buf
+ *
+ *      - used by the line discipline for OPOST processing
+ */
+static int dgap_tty_put_char(struct tty_struct *tty, unsigned char c)
+{
+	/*
+	 * Simply call tty_write.
+	 */
+	DPR_WRITE(("dgap_tty_put_char called\n"));
+	dgap_tty_write(tty, &c, 1);
+	return 1;
+}
+
+
+/*
+ * dgap_tty_write()
+ *
+ * Take data from the user or kernel and send it out to the FEP.
+ * In here exists all the Transparent Print magic as well.
+ */
+static int dgap_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+	struct channel_t *ch = NULL;
+	struct un_t *un = NULL;
+	struct bs_t *bs = NULL;
+	char *vaddr = NULL;
+	u16 head, tail, tmask, remain;
+	int bufcount = 0, n = 0;
+	int orig_count = 0;
+	ulong lock_flags;
+	int from_user = 0;
+
+	if (tty == NULL || dgap_TmpWriteBuf == NULL)
+		return(0);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (0);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return(0);
+
+        bs = ch->ch_bs;
+	if (!bs)
+		return(0);
+
+	if (!count)
+		return(0);
+
+	DPR_WRITE(("dgap_tty_write: Port: %x tty=%p user=%d len=%d\n",
+		ch->ch_portnum, tty, from_user, count));
+
+	/*
+	 * Store original amount of characters passed in.
+	 * This helps to figure out if we should ask the FEP
+	 * to send us an event when it has more space available.
+	 */
+	orig_count = count;
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+
+	/* Get our space available for the channel from the board */
+	tmask = ch->ch_tsize - 1;
+	head = readw(&(bs->tx_head)) & tmask;
+	tail = readw(&(bs->tx_tail)) & tmask;
+
+	if ((bufcount = tail - head - 1) < 0)
+		bufcount += ch->ch_tsize;
+
+	DPR_WRITE(("%d: bufcount: %x count: %x tail: %x head: %x tmask: %x\n",
+		__LINE__, bufcount, count, tail, head, tmask));
+
+	/*
+	 * Limit printer output to maxcps overall, with bursts allowed
+	 * up to bufsize characters.
+	 */
+	bufcount = dgap_maxcps_room(tty, bufcount);
+
+	/*
+	 * Take minimum of what the user wants to send, and the
+	 * space available in the FEP buffer.
+	 */
+	count = min(count, bufcount);
+
+	/*
+	 * Bail if no space left.
+	 */
+	if (count <= 0) {
+		dgap_set_firmware_event(un, UN_LOW | UN_EMPTY);
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+		return(0);
+	}
+
+	/*
+	 * Output the printer ON string, if we are in terminal mode, but
+	 * need to be in printer mode.
+	 */
+	if ((un->un_type == DGAP_PRINT) && !(ch->ch_flags & CH_PRON)) {
+		dgap_wmove(ch, ch->ch_digi.digi_onstr,
+		    (int) ch->ch_digi.digi_onlen);
+		head = readw(&(bs->tx_head)) & tmask;
+		ch->ch_flags |= CH_PRON;
+	}
+
+	/*
+	 * On the other hand, output the printer OFF string, if we are
+	 * currently in printer mode, but need to output to the terminal.
+	 */
+	if ((un->un_type != DGAP_PRINT) && (ch->ch_flags & CH_PRON)) {
+		dgap_wmove(ch, ch->ch_digi.digi_offstr,
+			(int) ch->ch_digi.digi_offlen);
+		head = readw(&(bs->tx_head)) & tmask;
+		ch->ch_flags &= ~CH_PRON;
+	}
+
+	/*
+	 * If there is nothing left to copy, or I can't handle any more data, leave.
+	 */
+	if (count <= 0) {
+		dgap_set_firmware_event(un, UN_LOW | UN_EMPTY);
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+		return(0);
+	}
+
+	if (from_user) {
+
+		count = min(count, WRITEBUFLEN);
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+		/*
+		 * If data is coming from user space, copy it into a temporary
+		 * buffer so we don't get swapped out while doing the copy to
+		 * the board.
+		 */
+		/* we're allowed to block if it's from_user */
+		if (down_interruptible(&dgap_TmpWriteSem)) {
+			return (-EINTR);
+		}
+
+		if (copy_from_user(dgap_TmpWriteBuf, (const uchar __user *) buf, count)) {
+			up(&dgap_TmpWriteSem);
+			printk("Write: Copy from user failed!\n");
+			return -EFAULT;
+		}
+
+		DGAP_LOCK(ch->ch_lock, lock_flags);
+
+		buf = dgap_TmpWriteBuf;
+	}
+
+	n = count;
+
+	/*
+	 * If the write wraps over the top of the circular buffer,
+	 * move the portion up to the wrap point, and reset the
+	 * pointers to the bottom.
+	 */
+	remain = ch->ch_tstart + ch->ch_tsize - head;
+
+	if (n >= remain) {
+		n -= remain;
+		vaddr = ch->ch_taddr + head;
+
+		memcpy_toio(vaddr, (uchar *) buf, remain);
+		dgap_sniff_nowait_nolock(ch, "USER WRITE", (uchar *) buf, remain);
+
+		head = ch->ch_tstart;
+		buf += remain;
+	}
+
+	if (n > 0) {
+
+		/*
+		 * Move rest of data.
+		 */
+		vaddr = ch->ch_taddr + head;
+		remain = n;
+
+		memcpy_toio(vaddr, (uchar *) buf, remain);
+		dgap_sniff_nowait_nolock(ch, "USER WRITE", (uchar *) buf, remain);
+
+		head += remain;
+
+	}
+
+	if (count) {
+		ch->ch_txcount += count;
+		head &= tmask;
+		writew(head, &(bs->tx_head));
+	}
+
+
+	dgap_set_firmware_event(un, UN_LOW | UN_EMPTY);
+
+	/*
+	 * If this is the print device, and the
+	 * printer is still on, we need to turn it
+	 * off before going idle.  If the buffer is
+	 * non-empty, wait until it goes empty.
+	 * Otherwise turn it off right now.
+	 */
+	if ((un->un_type == DGAP_PRINT) && (ch->ch_flags & CH_PRON)) {
+		tail = readw(&(bs->tx_tail)) & tmask;
+
+		if (tail != head) {
+			un->un_flags |= UN_EMPTY;
+			writeb(1, &(bs->iempty));
+		}
+		else {
+			dgap_wmove(ch, ch->ch_digi.digi_offstr,
+				(int) ch->ch_digi.digi_offlen);
+			head = readw(&(bs->tx_head)) & tmask;
+			ch->ch_flags &= ~CH_PRON;
+		}
+	}
+
+	/* Update printer buffer empty time. */
+	if ((un->un_type == DGAP_PRINT) && (ch->ch_digi.digi_maxcps > 0)
+	    && (ch->ch_digi.digi_bufsize > 0)) {
+                ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps;
+	}
+
+	if (from_user) {
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+		up(&dgap_TmpWriteSem);
+	}
+	else {
+		DGAP_UNLOCK(ch->ch_lock, lock_flags);
+	}
+
+	DPR_WRITE(("Write finished - Write %d bytes of %d.\n", count, orig_count));
+
+	return (count);
+}
+
+
+
+/*
+ * Return modem signals to ld.
+ */
+static int dgap_tty_tiocmget(struct tty_struct *tty)
+{
+	struct channel_t *ch;
+	struct un_t *un;
+	int result = -EIO;
+	uchar mstat = 0;
+	ulong lock_flags;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return result;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return result;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return result;
+
+	DPR_IOCTL(("dgap_tty_tiocmget start\n"));
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+
+	mstat = readb(&(ch->ch_bs->m_stat));
+        /* Append any outbound signals that might be pending... */
+        mstat |= ch->ch_mostat;
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	result = 0;
+
+	if (mstat & D_DTR(ch))
+		result |= TIOCM_DTR;
+	if (mstat & D_RTS(ch))
+		result |= TIOCM_RTS;
+	if (mstat & D_CTS(ch))
+		result |= TIOCM_CTS;
+	if (mstat & D_DSR(ch))
+		result |= TIOCM_DSR;
+	if (mstat & D_RI(ch))
+		result |= TIOCM_RI;
+	if (mstat & D_CD(ch))
+		result |= TIOCM_CD;
+
+	DPR_IOCTL(("dgap_tty_tiocmget finish\n"));
+
+	return result;
+}
+
+
+/*
+ * dgap_tty_tiocmset()
+ *
+ * Set modem signals, called by ld.
+ */
+
+static int dgap_tty_tiocmset(struct tty_struct *tty,
+                unsigned int set, unsigned int clear)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	int ret = -EIO;
+	ulong lock_flags;
+	ulong lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return ret;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return ret;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return ret;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return ret;
+
+	DPR_IOCTL(("dgap_tty_tiocmset start\n"));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	if (set & TIOCM_RTS) {
+		ch->ch_mforce |= D_RTS(ch);
+		ch->ch_mval   |= D_RTS(ch);
+        }
+
+	if (set & TIOCM_DTR) {
+		ch->ch_mforce |= D_DTR(ch);
+		ch->ch_mval   |= D_DTR(ch);
+        }
+
+	if (clear & TIOCM_RTS) {
+		ch->ch_mforce |= D_RTS(ch);
+		ch->ch_mval   &= ~(D_RTS(ch));
+        }
+
+	if (clear & TIOCM_DTR) {
+		ch->ch_mforce |= D_DTR(ch);
+		ch->ch_mval   &= ~(D_DTR(ch));
+        }
+
+	dgap_param(tty);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_tty_tiocmset finish\n"));
+
+	return (0);
+}
+
+
+
+/*
+ * dgap_tty_send_break()
+ *
+ * Send a Break, called by ld.
+ */
+static int dgap_tty_send_break(struct tty_struct *tty, int msec)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	int ret = -EIO;
+	ulong lock_flags;
+	ulong lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return ret;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return ret;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return ret;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return ret;
+
+	switch (msec) {
+	case -1:
+		msec = 0xFFFF;
+		break;
+	case 0:
+		msec = 1;
+		break;
+	default:
+		msec /= 10;
+		break;
+	}
+
+	DPR_IOCTL(("dgap_tty_send_break start 1.  %lx\n", jiffies));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+#if 0
+	dgap_cmdw(ch, SBREAK, (u16) SBREAK_TIME, 0);
+#endif
+	dgap_cmdw(ch, SBREAK, (u16) msec, 0);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_tty_send_break finish\n"));
+
+	return (0);
+}
+
+
+
+
+/*
+ * dgap_tty_wait_until_sent()
+ *
+ * wait until data has been transmitted, called by ld.
+ */
+static void dgap_tty_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+	int rc;
+	rc = dgap_wait_for_drain(tty);
+	if (rc) {
+		DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
+		return;
+	}
+	return;
+}
+
+
+
+/*
+ * dgap_send_xchar()
+ *
+ * send a high priority character, called by ld.
+ */
+static void dgap_tty_send_xchar(struct tty_struct *tty, char c)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	ulong lock_flags;
+	ulong lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_IOCTL(("dgap_tty_send_xchar start 1.  %lx\n", jiffies));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	/*
+	 * This is technically what we should do.
+	 * However, the NIST tests specifically want
+	 * to see each XON or XOFF character that it
+	 * sends, so lets just send each character
+	 * by hand...
+	 */
+#if 0
+	if (c == STOP_CHAR(tty)) {
+		dgap_cmdw(ch, RPAUSE, 0, 0);
+	}
+	else if (c == START_CHAR(tty)) {
+		dgap_cmdw(ch, RRESUME, 0, 0);
+	}
+	else {
+		dgap_wmove(ch, &c, 1);
+	}
+#else
+	dgap_wmove(ch, &c, 1);
+#endif
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_tty_send_xchar finish\n"));
+
+	return;
+}
+
+
+
+
+/*
+ * Return modem signals to ld.
+ */
+static int dgap_get_modem_info(struct channel_t *ch, unsigned int __user *value)
+{
+	int result = 0;
+	uchar mstat = 0;
+	ulong lock_flags;
+	int rc = 0;
+
+	DPR_IOCTL(("dgap_get_modem_info start\n"));
+
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return(-ENXIO);
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+
+	mstat = readb(&(ch->ch_bs->m_stat));
+	/* Append any outbound signals that might be pending... */
+	mstat |= ch->ch_mostat;
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	result = 0;
+
+	if (mstat & D_DTR(ch))
+		result |= TIOCM_DTR;
+	if (mstat & D_RTS(ch))
+		result |= TIOCM_RTS;
+	if (mstat & D_CTS(ch))
+		result |= TIOCM_CTS;
+	if (mstat & D_DSR(ch))
+		result |= TIOCM_DSR;
+	if (mstat & D_RI(ch))
+		result |= TIOCM_RI;
+	if (mstat & D_CD(ch))
+		result |= TIOCM_CD;
+
+	rc = put_user(result, value);
+
+	DPR_IOCTL(("dgap_get_modem_info finish\n"));
+	return(rc);
+}
+
+
+/*
+ * dgap_set_modem_info()
+ *
+ * Set modem signals, called by ld.
+ */
+static int dgap_set_modem_info(struct tty_struct *tty, unsigned int command, unsigned int __user *value)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	int ret = -ENXIO;
+	unsigned int arg = 0;
+	ulong lock_flags;
+	ulong lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return ret;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return ret;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return ret;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return ret;
+
+	DPR_IOCTL(("dgap_set_modem_info() start\n"));
+
+	ret = get_user(arg, value);
+	if (ret) {
+		DPR_IOCTL(("dgap_set_modem_info %d ret: %x. finished.\n", __LINE__, ret));
+		return(ret);
+	}
+
+	DPR_IOCTL(("dgap_set_modem_info: command: %x arg: %x\n", command, arg));
+
+	switch (command) {
+	case TIOCMBIS:
+		if (arg & TIOCM_RTS) {
+			ch->ch_mforce |= D_RTS(ch);
+			ch->ch_mval   |= D_RTS(ch);
+        	}
+
+		if (arg & TIOCM_DTR) {
+			ch->ch_mforce |= D_DTR(ch);
+			ch->ch_mval   |= D_DTR(ch);
+        	}
+
+		break;
+
+	case TIOCMBIC:
+		if (arg & TIOCM_RTS) {
+			ch->ch_mforce |= D_RTS(ch);
+			ch->ch_mval   &= ~(D_RTS(ch));
+        	}
+
+		if (arg & TIOCM_DTR) {
+			ch->ch_mforce |= D_DTR(ch);
+			ch->ch_mval   &= ~(D_DTR(ch));
+        	}
+
+		break;
+
+        case TIOCMSET:
+		ch->ch_mforce = D_DTR(ch)|D_RTS(ch);
+
+		if (arg & TIOCM_RTS) {
+			ch->ch_mval |= D_RTS(ch);
+        	}
+		else {
+			ch->ch_mval &= ~(D_RTS(ch));
+		}
+
+		if (arg & TIOCM_DTR) {
+			ch->ch_mval |= (D_DTR(ch));
+        	}
+		else {
+			ch->ch_mval &= ~(D_DTR(ch));
+		}
+
+		break;
+
+	default:
+		return(-EINVAL);
+	}
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	dgap_param(tty);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_set_modem_info finish\n"));
+
+	return (0);
+}
+
+
+/*
+ * dgap_tty_digigeta()
+ *
+ * Ioctl to get the information for ditty.
+ *
+ *
+ *
+ */
+static int dgap_tty_digigeta(struct tty_struct *tty, struct digi_t __user *retinfo)
+{
+	struct channel_t *ch;
+	struct un_t *un;
+	struct digi_t tmp;
+	ulong lock_flags;
+
+	if (!retinfo)
+		return (-EFAULT);
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return (-EFAULT);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (-EFAULT);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (-EFAULT);
+
+	memset(&tmp, 0, sizeof(tmp));
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+	memcpy(&tmp, &ch->ch_digi, sizeof(tmp));
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+		return (-EFAULT);
+
+	return (0);
+}
+
+
+/*
+ * dgap_tty_digiseta()
+ *
+ * Ioctl to set the information for ditty.
+ *
+ *
+ *
+ */
+static int dgap_tty_digiseta(struct tty_struct *tty, struct digi_t __user *new_info)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	struct digi_t new_digi;
+	ulong   lock_flags = 0;
+	unsigned long lock_flags2;
+
+	DPR_IOCTL(("DIGI_SETA start\n"));
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return (-EFAULT);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (-EFAULT);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (-EFAULT);
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return (-EFAULT);
+
+        if (copy_from_user(&new_digi, new_info, sizeof(struct digi_t))) {
+		DPR_IOCTL(("DIGI_SETA failed copy_from_user\n"));
+                return(-EFAULT);
+	}
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	memcpy(&ch->ch_digi, &new_digi, sizeof(struct digi_t));
+
+	if (ch->ch_digi.digi_maxcps < 1)
+		ch->ch_digi.digi_maxcps = 1;
+
+	if (ch->ch_digi.digi_maxcps > 10000)
+		ch->ch_digi.digi_maxcps = 10000;
+
+	if (ch->ch_digi.digi_bufsize < 10)
+		ch->ch_digi.digi_bufsize = 10;
+
+	if (ch->ch_digi.digi_maxchar < 1)
+		ch->ch_digi.digi_maxchar = 1;
+
+	if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize)
+		ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize;
+
+	if (ch->ch_digi.digi_onlen > DIGI_PLEN)
+		ch->ch_digi.digi_onlen = DIGI_PLEN;
+
+	if (ch->ch_digi.digi_offlen > DIGI_PLEN)
+		ch->ch_digi.digi_offlen = DIGI_PLEN;
+
+	dgap_param(tty);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("DIGI_SETA finish\n"));
+
+	return(0);
+}
+
+
+/*
+ * dgap_tty_digigetedelay()
+ *
+ * Ioctl to get the current edelay setting.
+ *
+ *
+ *
+ */
+static int dgap_tty_digigetedelay(struct tty_struct *tty, int __user *retinfo)
+{
+	struct channel_t *ch;
+	struct un_t *un;
+	int tmp;
+	ulong lock_flags;
+
+	if (!retinfo)
+		return (-EFAULT);
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return (-EFAULT);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (-EFAULT);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (-EFAULT);
+
+	memset(&tmp, 0, sizeof(tmp));
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+	tmp = readw(&(ch->ch_bs->edelay));
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+		return (-EFAULT);
+
+	return (0);
+}
+
+
+/*
+ * dgap_tty_digisetedelay()
+ *
+ * Ioctl to set the EDELAY setting
+ *
+ */
+static int dgap_tty_digisetedelay(struct tty_struct *tty, int __user *new_info)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	int new_digi;
+	ulong lock_flags;
+	ulong lock_flags2;
+
+	DPR_IOCTL(("DIGI_SETA start\n"));
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return (-EFAULT);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (-EFAULT);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (-EFAULT);
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return (-EFAULT);
+
+        if (copy_from_user(&new_digi, new_info, sizeof(int))) {
+		DPR_IOCTL(("DIGI_SETEDELAY failed copy_from_user\n"));
+                return(-EFAULT);
+	}
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	writew((u16) new_digi, &(ch->ch_bs->edelay));
+
+	dgap_param(tty);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("DIGI_SETA finish\n"));
+
+	return(0);
+}
+
+
+/*
+ * dgap_tty_digigetcustombaud()
+ *
+ * Ioctl to get the current custom baud rate setting.
+ */
+static int dgap_tty_digigetcustombaud(struct tty_struct *tty, int __user *retinfo)
+{
+	struct channel_t *ch;
+	struct un_t *un;
+	int tmp;
+	ulong lock_flags;
+
+	if (!retinfo)
+		return (-EFAULT);
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return (-EFAULT);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (-EFAULT);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (-EFAULT);
+
+	memset(&tmp, 0, sizeof(tmp));
+
+	DGAP_LOCK(ch->ch_lock, lock_flags);
+	tmp = dgap_get_custom_baud(ch);
+	DGAP_UNLOCK(ch->ch_lock, lock_flags);
+
+	DPR_IOCTL(("DIGI_GETCUSTOMBAUD. Returning %d\n", tmp));
+
+	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+		return (-EFAULT);
+
+	return (0);
+}
+
+
+/*
+ * dgap_tty_digisetcustombaud()
+ *
+ * Ioctl to set the custom baud rate setting
+ */
+static int dgap_tty_digisetcustombaud(struct tty_struct *tty, int __user *new_info)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	uint new_rate;
+	ulong lock_flags;
+	ulong lock_flags2;
+
+	DPR_IOCTL(("DIGI_SETCUSTOMBAUD start\n"));
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return (-EFAULT);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (-EFAULT);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (-EFAULT);
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return (-EFAULT);
+
+
+	if (copy_from_user(&new_rate, new_info, sizeof(unsigned int))) {
+		DPR_IOCTL(("DIGI_SETCUSTOMBAUD failed copy_from_user\n"));
+		return(-EFAULT);
+	}
+
+	if (bd->bd_flags & BD_FEP5PLUS) {
+
+		DPR_IOCTL(("DIGI_SETCUSTOMBAUD. Setting %d\n", new_rate));
+
+		DGAP_LOCK(bd->bd_lock, lock_flags);
+		DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+		ch->ch_custom_speed = new_rate;
+
+		dgap_param(tty);
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+	}
+
+	DPR_IOCTL(("DIGI_SETCUSTOMBAUD finish\n"));
+
+	return(0);
+}
+
+
+/*
+ * dgap_set_termios()
+ */
+static void dgap_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	unsigned long lock_flags;
+	unsigned long lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	ch->ch_c_cflag   = tty->termios.c_cflag;
+	ch->ch_c_iflag   = tty->termios.c_iflag;
+	ch->ch_c_oflag   = tty->termios.c_oflag;
+	ch->ch_c_lflag   = tty->termios.c_lflag;
+	ch->ch_startc    = tty->termios.c_cc[VSTART];
+	ch->ch_stopc     = tty->termios.c_cc[VSTOP];
+
+	dgap_carrier(ch);
+	dgap_param(tty);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+}
+
+
+static void dgap_tty_throttle(struct tty_struct *tty)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	ulong   lock_flags;
+	ulong   lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+        ch = un->un_ch;
+        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+                return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_IOCTL(("dgap_tty_throttle start\n"));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	ch->ch_flags |= (CH_RXBLOCK);
+#if 1
+	dgap_cmdw(ch, RPAUSE, 0, 0);
+#endif
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_tty_throttle finish\n"));
+}
+
+
+static void dgap_tty_unthrottle(struct tty_struct *tty)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	ulong   lock_flags;
+	ulong   lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+        ch = un->un_ch;
+        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+                return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_IOCTL(("dgap_tty_unthrottle start\n"));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	ch->ch_flags &= ~(CH_RXBLOCK);
+
+#if 1
+	dgap_cmdw(ch, RRESUME, 0, 0);
+#endif
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_tty_unthrottle finish\n"));
+}
+
+
+static void dgap_tty_start(struct tty_struct *tty)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	ulong   lock_flags;
+	ulong   lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+        ch = un->un_ch;
+        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+                return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_IOCTL(("dgap_tty_start start\n"));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	dgap_cmdw(ch, RESUMETX, 0, 0);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_tty_start finish\n"));
+}
+
+
+static void dgap_tty_stop(struct tty_struct *tty)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	ulong   lock_flags;
+	ulong   lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+        ch = un->un_ch;
+        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+                return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_IOCTL(("dgap_tty_stop start\n"));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	dgap_cmdw(ch, PAUSETX, 0, 0);
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_tty_stop finish\n"));
+}
+
+
+/*
+ * dgap_tty_flush_chars()
+ *
+ * Flush the cook buffer
+ *
+ * Note to self, and any other poor souls who venture here:
+ *
+ * flush in this case DOES NOT mean dispose of the data.
+ * instead, it means "stop buffering and send it if you
+ * haven't already."  Just guess how I figured that out...   SRW 2-Jun-98
+ *
+ * It is also always called in interrupt context - JAR 8-Sept-99
+ */
+static void dgap_tty_flush_chars(struct tty_struct *tty)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	ulong   lock_flags;
+	ulong   lock_flags2;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+        ch = un->un_ch;
+        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+                return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_IOCTL(("dgap_tty_flush_chars start\n"));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	/* TODO: Do something here */
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+	DPR_IOCTL(("dgap_tty_flush_chars finish\n"));
+}
+
+
+
+/*
+ * dgap_tty_flush_buffer()
+ *
+ * Flush Tx buffer (make in == out)
+ */
+static void dgap_tty_flush_buffer(struct tty_struct *tty)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	ulong   lock_flags;
+	ulong   lock_flags2;
+	u16	head = 0;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return;
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return;
+
+        ch = un->un_ch;
+        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+                return;
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return;
+
+	DPR_IOCTL(("dgap_tty_flush_buffer on port: %d start\n", ch->ch_portnum));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	ch->ch_flags &= ~CH_STOP;
+	head = readw(&(ch->ch_bs->tx_head));
+	dgap_cmdw(ch, FLUSHTX, (u16) head, 0);
+	dgap_cmdw(ch, RESUMETX, 0, 0);
+	if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) {
+		ch->ch_tun.un_flags &= ~(UN_LOW|UN_EMPTY);
+		wake_up_interruptible(&ch->ch_tun.un_flags_wait);
+	}
+	if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) {
+		ch->ch_pun.un_flags &= ~(UN_LOW|UN_EMPTY);
+		wake_up_interruptible(&ch->ch_pun.un_flags_wait);
+	}
+
+	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+	DGAP_UNLOCK(bd->bd_lock, lock_flags);
+	if (waitqueue_active(&tty->write_wait))
+		wake_up_interruptible(&tty->write_wait);
+	tty_wakeup(tty);
+
+	DPR_IOCTL(("dgap_tty_flush_buffer finish\n"));
+}
+
+
+
+/*****************************************************************************
+ *
+ * The IOCTL function and all of its helpers
+ *
+ *****************************************************************************/
+
+/*
+ * dgap_tty_ioctl()
+ *
+ * The usual assortment of ioctl's
+ */
+static int dgap_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
+		unsigned long arg)
+{
+	struct board_t *bd;
+	struct channel_t *ch;
+	struct un_t *un;
+	int rc;
+	u16	head = 0;
+	ulong   lock_flags = 0;
+	ulong   lock_flags2 = 0;
+	void __user *uarg = (void __user *) arg;
+
+	if (!tty || tty->magic != TTY_MAGIC)
+		return (-ENODEV);
+
+	un = tty->driver_data;
+	if (!un || un->magic != DGAP_UNIT_MAGIC)
+		return (-ENODEV);
+
+	ch = un->un_ch;
+	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
+		return (-ENODEV);
+
+	bd = ch->ch_bd;
+	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
+		return (-ENODEV);
+
+	DPR_IOCTL(("dgap_tty_ioctl start on port %d - cmd %s (%x), arg %lx\n",
+		ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
+
+	DGAP_LOCK(bd->bd_lock, lock_flags);
+	DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+	if (un->un_open_count <= 0) {
+		DPR_BASIC(("dgap_tty_ioctl - unit not open.\n"));
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return(-EIO);
+	}
+
+	switch (cmd) {
+
+	/* Here are all the standard ioctl's that we MUST implement */
+
+	case TCSBRK:
+		/*
+		 * TCSBRK is SVID version: non-zero arg --> no break
+		 * this behaviour is exploited by tcdrain().
+		 *
+		 * According to POSIX.1 spec (7.2.2.1.2) breaks should be
+		 * between 0.25 and 0.5 seconds so we'll ask for something
+		 * in the middle: 0.375 seconds.
+		 */
+		rc = tty_check_change(tty);
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		if (rc) {
+			return(rc);
+		}
+
+		rc = dgap_wait_for_drain(tty);
+
+		if (rc) {
+			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
+			return(-EINTR);
+		}
+
+		DGAP_LOCK(bd->bd_lock, lock_flags);
+		DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+		if(((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) {
+			dgap_cmdw(ch, SBREAK, (u16) SBREAK_TIME, 0);
+		}
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+		DPR_IOCTL(("dgap_tty_ioctl finish on port %d - cmd %s (%x), arg %lx\n",
+			ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
+
+                return(0);
+
+
+	case TCSBRKP:
+ 		/* support for POSIX tcsendbreak()
+
+		 * According to POSIX.1 spec (7.2.2.1.2) breaks should be
+		 * between 0.25 and 0.5 seconds so we'll ask for something
+		 * in the middle: 0.375 seconds.
+		 */
+		rc = tty_check_change(tty);
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		if (rc) {
+			return(rc);
+		}
+
+		rc = dgap_wait_for_drain(tty);
+		if (rc) {
+			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
+			return(-EINTR);
+		}
+
+		DGAP_LOCK(bd->bd_lock, lock_flags);
+		DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+		dgap_cmdw(ch, SBREAK, (u16) SBREAK_TIME, 0);
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+		DPR_IOCTL(("dgap_tty_ioctl finish on port %d - cmd %s (%x), arg %lx\n",
+			ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
+
+		return(0);
+
+        case TIOCSBRK:
+		/*
+		 * FEP5 doesn't support turning on a break unconditionally.
+		 * The FEP5 device will stop sending a break automatically
+		 * after the specified time value that was sent when turning on
+		 * the break.
+		 */
+		rc = tty_check_change(tty);
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		if (rc) {
+			return(rc);
+		}
+
+		rc = dgap_wait_for_drain(tty);
+		if (rc) {
+			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
+			return(-EINTR);
+		}
+
+		DGAP_LOCK(bd->bd_lock, lock_flags);
+		DGAP_LOCK(ch->ch_lock, lock_flags2);
+
+		dgap_cmdw(ch, SBREAK, (u16) SBREAK_TIME, 0);
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+		DPR_IOCTL(("dgap_tty_ioctl finish on port %d - cmd %s (%x), arg %lx\n",
+			ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
+
+		return 0;
+
+        case TIOCCBRK:
+		/*
+		 * FEP5 doesn't support turning off a break unconditionally.
+		 * The FEP5 device will stop sending a break automatically
+		 * after the specified time value that was sent when turning on
+		 * the break.
+		 */
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return 0;
+
+	case TIOCGSOFTCAR:
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+		rc = put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) arg);
+		return(rc);
+
+	case TIOCSSOFTCAR:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+		rc = get_user(arg, (unsigned long __user *) arg);
+		if (rc)
+			return(rc);
+
+		DGAP_LOCK(bd->bd_lock, lock_flags);
+		DGAP_LOCK(ch->ch_lock, lock_flags2);
+		tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
+		dgap_param(tty);
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+		return(0);
+
+	case TIOCMGET:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+                return(dgap_get_modem_info(ch, uarg));
+
+	case TIOCMBIS:
+	case TIOCMBIC:
+	case TIOCMSET:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return(dgap_set_modem_info(tty, cmd, uarg));
+
+		/*
+		 * Here are any additional ioctl's that we want to implement
+		 */
+
+	case TCFLSH:
+		/*
+		 * The linux tty driver doesn't have a flush
+		 * input routine for the driver, assuming all backed
+		 * up data is in the line disc. buffers.  However,
+		 * we all know that's not the case.  Here, we
+		 * act on the ioctl, but then lie and say we didn't
+		 * so the line discipline will process the flush
+		 * also.
+		 */
+		rc = tty_check_change(tty);
+		if (rc) {
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			return(rc);
+		}
+
+		if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) {
+			if (!(un->un_type == DGAP_PRINT)) {
+				head = readw(&(ch->ch_bs->rx_head));
+				writew(head, &(ch->ch_bs->rx_tail));
+				writeb(0, &(ch->ch_bs->orun));
+			}
+		}
+
+		if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) {
+			ch->ch_flags &= ~CH_STOP;
+			head = readw(&(ch->ch_bs->tx_head));
+			dgap_cmdw(ch, FLUSHTX, (u16) head, 0 );
+			dgap_cmdw(ch, RESUMETX, 0, 0);
+			if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) {
+				ch->ch_tun.un_flags &= ~(UN_LOW|UN_EMPTY);
+				wake_up_interruptible(&ch->ch_tun.un_flags_wait);
+			}
+			if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) {
+				ch->ch_pun.un_flags &= ~(UN_LOW|UN_EMPTY);
+				wake_up_interruptible(&ch->ch_pun.un_flags_wait);
+			}
+			if (waitqueue_active(&tty->write_wait))
+				wake_up_interruptible(&tty->write_wait);
+
+			/* Can't hold any locks when calling tty_wakeup! */
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			tty_wakeup(tty);
+			DGAP_LOCK(bd->bd_lock, lock_flags);
+			DGAP_LOCK(ch->ch_lock, lock_flags2);
+		}
+
+		/* pretend we didn't recognize this IOCTL */
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+		DPR_IOCTL(("dgap_tty_ioctl (LINE:%d) finish on port %d - cmd %s (%x), arg %lx\n",
+			__LINE__, ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
+
+		return(-ENOIOCTLCMD);
+
+	case TCSETSF:
+	case TCSETSW:
+		/*
+		 * The linux tty driver doesn't have a flush
+		 * input routine for the driver, assuming all backed
+		 * up data is in the line disc. buffers.  However,
+		 * we all know that's not the case.  Here, we
+		 * act on the ioctl, but then lie and say we didn't
+		 * so the line discipline will process the flush
+		 * also.
+		 */
+		if (cmd == TCSETSF) {
+			/* flush rx */
+			ch->ch_flags &= ~CH_STOP;
+			head = readw(&(ch->ch_bs->rx_head));
+			writew(head, &(ch->ch_bs->rx_tail));
+		}
+
+		/* now wait for all the output to drain */
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		rc = dgap_wait_for_drain(tty);
+		if (rc) {
+			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
+			return(-EINTR);
+		}
+
+		DPR_IOCTL(("dgap_tty_ioctl finish on port %d - cmd %s (%x), arg %lx\n",
+			ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
+
+		/* pretend we didn't recognize this */
+		return(-ENOIOCTLCMD);
+
+	case TCSETAW:
+
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		rc = dgap_wait_for_drain(tty);
+		if (rc) {
+			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
+			return(-EINTR);
+		}
+
+		/* pretend we didn't recognize this */
+		return(-ENOIOCTLCMD);
+
+	case TCXONC:
+		/*
+		 * The Linux Line Discipline (LD) would do this for us if we
+		 * let it, but we have the special firmware options to do this
+		 * the "right way" regardless of hardware or software flow
+		 * control so we'll do it outselves instead of letting the LD
+		 * do it.
+		 */
+		rc = tty_check_change(tty);
+		if (rc) {
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			return(rc);
+		}
+
+		DPR_IOCTL(("dgap_ioctl - in TCXONC - %d\n", cmd));
+		switch (arg) {
+
+		case TCOON:
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			dgap_tty_start(tty);
+			return(0);
+		case TCOOFF:
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			dgap_tty_stop(tty);
+			return(0);
+		case TCION:
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			/* Make the ld do it */
+			return(-ENOIOCTLCMD);
+		case TCIOFF:
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			/* Make the ld do it */
+			return(-ENOIOCTLCMD);
+		default:
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			return(-EINVAL);
+		}
+
+	case DIGI_GETA:
+		/* get information for ditty */
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return(dgap_tty_digigeta(tty, uarg));
+
+	case DIGI_SETAW:
+	case DIGI_SETAF:
+
+		/* set information for ditty */
+		if (cmd == (DIGI_SETAW)) {
+
+			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+			DGAP_UNLOCK(bd->bd_lock, lock_flags);
+			rc = dgap_wait_for_drain(tty);
+			if (rc) {
+				DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
+				return(-EINTR);
+			}
+			DGAP_LOCK(bd->bd_lock, lock_flags);
+			DGAP_LOCK(ch->ch_lock, lock_flags2);
+		}
+		else {
+			tty_ldisc_flush(tty);
+		}
+		/* fall thru */
+
+	case DIGI_SETA:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return(dgap_tty_digiseta(tty, uarg));
+
+	case DIGI_GEDELAY:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return(dgap_tty_digigetedelay(tty, uarg));
+
+	case DIGI_SEDELAY:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return(dgap_tty_digisetedelay(tty, uarg));
+
+	case DIGI_GETCUSTOMBAUD:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return(dgap_tty_digigetcustombaud(tty, uarg));
+
+	case DIGI_SETCUSTOMBAUD:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return(dgap_tty_digisetcustombaud(tty, uarg));
+
+	case DIGI_RESET_PORT:
+		dgap_firmware_reset_port(ch);
+		dgap_param(tty);
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+		return 0;
+
+	default:
+		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
+		DGAP_UNLOCK(bd->bd_lock, lock_flags);
+
+		DPR_IOCTL(("dgap_tty_ioctl - in default\n"));
+		DPR_IOCTL(("dgap_tty_ioctl end - cmd %s (%x), arg %lx\n",
+			dgap_ioctl_name(cmd), cmd, arg));
+
+		return(-ENOIOCTLCMD);
+	}
+}
diff --git a/drivers/staging/dgap/dgap_tty.c b/drivers/staging/dgap/dgap_tty.c
deleted file mode 100644
index 9b3d3b5..0000000
--- a/drivers/staging/dgap/dgap_tty.c
+++ /dev/null
@@ -1,3555 +0,0 @@
-/*
- * Copyright 2003 Digi International (www.digi.com)
- *	Scott H Kilau <Scott_Kilau at digi dot com>
- *
- * 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, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; 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.
- *
- *
- *	NOTE TO LINUX KERNEL HACKERS:  DO NOT REFORMAT THIS CODE!
- *
- *	This is shared code between Digi's CVS archive and the
- *	Linux Kernel sources.
- *	Changing the source just for reformatting needlessly breaks
- *	our CVS diff history.
- *
- *	Send any bug fixes/changes to:  Eng.Linux at digi dot com.
- *	Thank you.
- */
-
-/************************************************************************
- *
- * This file implements the tty driver functionality for the
- * FEP5 based product lines.
- *
- ************************************************************************
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>	/* For jiffies, task states */
-#include <linux/interrupt.h>	/* For tasklet and interrupt structs/defines */
-#include <linux/module.h>
-#include <linux/ctype.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial_reg.h>
-#include <linux/slab.h>
-#include <linux/delay.h>	/* For udelay */
-#include <asm/uaccess.h>	/* For copy_from_user/copy_to_user */
-#include <asm/io.h>		/* For read[bwl]/write[bwl] */
-#include <linux/pci.h>
-
-#include "dgap_driver.h"
-#include "dgap_tty.h"
-#include "dgap_types.h"
-#include "dgap_fep5.h"
-#include "dgap_parse.h"
-#include "dgap_conf.h"
-#include "dgap_sysfs.h"
-
-#define init_MUTEX(sem)         sema_init(sem, 1)
-#define DECLARE_MUTEX(name)     \
-        struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
-
-/*
- * internal variables
- */
-static struct board_t	*dgap_BoardsByMajor[256];
-static uchar		*dgap_TmpWriteBuf = NULL;
-static DECLARE_MUTEX(dgap_TmpWriteSem);
-
-/*
- * Default transparent print information.
- */
-static struct digi_t dgap_digi_init = {
-	.digi_flags =	DIGI_COOK,	/* Flags			*/
-	.digi_maxcps =	100,		/* Max CPS			*/
-	.digi_maxchar =	50,		/* Max chars in print queue	*/
-	.digi_bufsize =	100,		/* Printer buffer size		*/
-	.digi_onlen =	4,		/* size of printer on string	*/
-	.digi_offlen =	4,		/* size of printer off string	*/
-	.digi_onstr =	"\033[5i",	/* ANSI printer on string ]	*/
-	.digi_offstr =	"\033[4i",	/* ANSI printer off string ]	*/
-	.digi_term =	"ansi"		/* default terminal type	*/
-};
-
-
-/*
- * Define a local default termios struct. All ports will be created
- * with this termios initially.
- *
- * This defines a raw port at 9600 baud, 8 data bits, no parity,
- * 1 stop bit.
- */
-
-static struct ktermios DgapDefaultTermios =
-{
-	.c_iflag =	(DEFAULT_IFLAGS),	/* iflags */
-	.c_oflag =	(DEFAULT_OFLAGS),	/* oflags */
-	.c_cflag =	(DEFAULT_CFLAGS),	/* cflags */
-	.c_lflag =	(DEFAULT_LFLAGS),	/* lflags */
-	.c_cc =		INIT_C_CC,
-	.c_line = 	0,
-};
-
-/* Our function prototypes */
-static int dgap_tty_open(struct tty_struct *tty, struct file *file);
-static void dgap_tty_close(struct tty_struct *tty, struct file *file);
-static int dgap_block_til_ready(struct tty_struct *tty, struct file *file, struct channel_t *ch);
-static int dgap_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
-static int dgap_tty_digigeta(struct tty_struct *tty, struct digi_t __user *retinfo);
-static int dgap_tty_digiseta(struct tty_struct *tty, struct digi_t __user *new_info);
-static int dgap_tty_digigetedelay(struct tty_struct *tty, int __user *retinfo);
-static int dgap_tty_digisetedelay(struct tty_struct *tty, int __user *new_info);
-static int dgap_tty_write_room(struct tty_struct* tty);
-static int dgap_tty_chars_in_buffer(struct tty_struct* tty);
-static void dgap_tty_start(struct tty_struct *tty);
-static void dgap_tty_stop(struct tty_struct *tty);
-static void dgap_tty_throttle(struct tty_struct *tty);
-static void dgap_tty_unthrottle(struct tty_struct *tty);
-static void dgap_tty_flush_chars(struct tty_struct *tty);
-static void dgap_tty_flush_buffer(struct tty_struct *tty);
-static void dgap_tty_hangup(struct tty_struct *tty);
-static int dgap_wait_for_drain(struct tty_struct *tty);
-static int dgap_set_modem_info(struct tty_struct *tty, unsigned int command, unsigned int __user *value);
-static int dgap_get_modem_info(struct channel_t *ch, unsigned int __user *value);
-static int dgap_tty_digisetcustombaud(struct tty_struct *tty, int __user *new_info);
-static int dgap_tty_digigetcustombaud(struct tty_struct *tty, int __user *retinfo);
-static int dgap_tty_tiocmget(struct tty_struct *tty);
-static int dgap_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear);
-static int dgap_tty_send_break(struct tty_struct *tty, int msec);
-static void dgap_tty_wait_until_sent(struct tty_struct *tty, int timeout);
-static int dgap_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
-static void dgap_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios);
-static int dgap_tty_put_char(struct tty_struct *tty, unsigned char c);
-static void dgap_tty_send_xchar(struct tty_struct *tty, char ch);
-
-static const struct tty_operations dgap_tty_ops = {
-	.open = dgap_tty_open,
-	.close = dgap_tty_close,
-	.write = dgap_tty_write,
-	.write_room = dgap_tty_write_room,
-	.flush_buffer = dgap_tty_flush_buffer,
-	.chars_in_buffer = dgap_tty_chars_in_buffer,
-	.flush_chars = dgap_tty_flush_chars,
-	.ioctl = dgap_tty_ioctl,
-	.set_termios = dgap_tty_set_termios,
-	.stop = dgap_tty_stop,
-	.start = dgap_tty_start,
-	.throttle = dgap_tty_throttle,
-	.unthrottle = dgap_tty_unthrottle,
-	.hangup = dgap_tty_hangup,
-	.put_char = dgap_tty_put_char,
-	.tiocmget = dgap_tty_tiocmget,
-	.tiocmset = dgap_tty_tiocmset,
-	.break_ctl = dgap_tty_send_break,
-	.wait_until_sent = dgap_tty_wait_until_sent,
-	.send_xchar = dgap_tty_send_xchar
-};
-
-
-
-
-
-/************************************************************************
- *
- * TTY Initialization/Cleanup Functions
- *
- ************************************************************************/
-
-/*
- * dgap_tty_preinit()
- *
- * Initialize any global tty related data before we download any boards.
- */
-int dgap_tty_preinit(void)
-{
-	unsigned long flags;
-
-	DGAP_LOCK(dgap_global_lock, flags);
-
-	/*
-	 * Allocate a buffer for doing the copy from user space to
-	 * kernel space in dgap_input().  We only use one buffer and
-	 * control access to it with a semaphore.  If we are paging, we
-	 * are already in trouble so one buffer won't hurt much anyway.
-	 */
-	dgap_TmpWriteBuf = kmalloc(WRITEBUFLEN, GFP_ATOMIC);
-
-	if (!dgap_TmpWriteBuf) {
-		DGAP_UNLOCK(dgap_global_lock, flags);
-		DPR_INIT(("unable to allocate tmp write buf"));
-		return (-ENOMEM);
-	}
-
-        DGAP_UNLOCK(dgap_global_lock, flags);
-        return(0);
-}
-
-
-/*
- * dgap_tty_register()
- *
- * Init the tty subsystem for this board.
- */
-int dgap_tty_register(struct board_t *brd)
-{
-	int rc = 0;
-
-	DPR_INIT(("tty_register start"));
-
-	brd->SerialDriver = alloc_tty_driver(MAXPORTS);
-
-	snprintf(brd->SerialName, MAXTTYNAMELEN, "tty_dgap_%d_", brd->boardnum);
-	brd->SerialDriver->name = brd->SerialName;
-	brd->SerialDriver->name_base = 0;
-	brd->SerialDriver->major = 0;
-	brd->SerialDriver->minor_start = 0;
-	brd->SerialDriver->type = TTY_DRIVER_TYPE_SERIAL;
-	brd->SerialDriver->subtype = SERIAL_TYPE_NORMAL;
-	brd->SerialDriver->init_termios = DgapDefaultTermios;
-	brd->SerialDriver->driver_name = DRVSTR;
-	brd->SerialDriver->flags = (TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_HARDWARE_BREAK);
-
-	/* The kernel wants space to store pointers to tty_structs */
-	brd->SerialDriver->ttys = kzalloc(MAXPORTS * sizeof(struct tty_struct *), GFP_KERNEL);
-	if (!brd->SerialDriver->ttys)
-		return(-ENOMEM);
-
-	/*
-	 * Entry points for driver.  Called by the kernel from
-	 * tty_io.c and n_tty.c.
-	 */
-	tty_set_operations(brd->SerialDriver, &dgap_tty_ops);
-
-	/*
-	 * If we're doing transparent print, we have to do all of the above
-	 * again, separately so we don't get the LD confused about what major
-	 * we are when we get into the dgap_tty_open() routine.
-	 */
-	brd->PrintDriver = alloc_tty_driver(MAXPORTS);
-
-	snprintf(brd->PrintName, MAXTTYNAMELEN, "pr_dgap_%d_", brd->boardnum);
-	brd->PrintDriver->name = brd->PrintName;
-	brd->PrintDriver->name_base = 0;
-	brd->PrintDriver->major = 0;
-	brd->PrintDriver->minor_start = 0;
-	brd->PrintDriver->type = TTY_DRIVER_TYPE_SERIAL;
-	brd->PrintDriver->subtype = SERIAL_TYPE_NORMAL;
-	brd->PrintDriver->init_termios = DgapDefaultTermios;
-	brd->PrintDriver->driver_name = DRVSTR;
-	brd->PrintDriver->flags = (TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_HARDWARE_BREAK);
-
-	/* The kernel wants space to store pointers to tty_structs */
-	brd->PrintDriver->ttys = kzalloc(MAXPORTS * sizeof(struct tty_struct *), GFP_KERNEL);
-	if (!brd->PrintDriver->ttys)
-		return(-ENOMEM);
-
-	/*
-	 * Entry points for driver.  Called by the kernel from
-	 * tty_io.c and n_tty.c.
-	 */
-	tty_set_operations(brd->PrintDriver, &dgap_tty_ops);
-
-	if (!brd->dgap_Major_Serial_Registered) {
-		/* Register tty devices */
-		rc = tty_register_driver(brd->SerialDriver);
-		if (rc < 0) {
-			APR(("Can't register tty device (%d)\n", rc));
-			return(rc);
-		}
-		brd->dgap_Major_Serial_Registered = TRUE;
-		dgap_BoardsByMajor[brd->SerialDriver->major] = brd;
-		brd->dgap_Serial_Major = brd->SerialDriver->major;
-	}
-
-	if (!brd->dgap_Major_TransparentPrint_Registered) {
-		/* Register Transparent Print devices */
- 		rc = tty_register_driver(brd->PrintDriver);
-		if (rc < 0) {
-			APR(("Can't register Transparent Print device (%d)\n", rc));
-			return(rc);
-		}
-		brd->dgap_Major_TransparentPrint_Registered = TRUE;
-		dgap_BoardsByMajor[brd->PrintDriver->major] = brd;
-		brd->dgap_TransparentPrint_Major = brd->PrintDriver->major;
-	}
-
-	DPR_INIT(("DGAP REGISTER TTY: MAJORS: %d %d\n", brd->SerialDriver->major,
-		brd->PrintDriver->major));
-
-	return (rc);
-}
-
-
-/*
- * dgap_tty_init()
- *
- * Init the tty subsystem.  Called once per board after board has been
- * downloaded and init'ed.
- */
-int dgap_tty_init(struct board_t *brd)
-{
-	int i;
-	int tlw;
-	uint true_count = 0;
-	uchar *vaddr;
-	uchar modem = 0;
-	struct channel_t *ch;
-	struct bs_t *bs;
-	struct cm_t *cm;
-
-	if (!brd)
-		return (-ENXIO);
-
-	DPR_INIT(("dgap_tty_init start\n"));
-
-	/*
-	 * Initialize board structure elements.
-	 */
-
-	vaddr = brd->re_map_membase;
-	true_count = readw((vaddr + NCHAN));
-
-	brd->nasync = dgap_config_get_number_of_ports(brd);
-
-	if (!brd->nasync) {
-		brd->nasync = brd->maxports;
-	}
-
-	if (brd->nasync > brd->maxports) {
-		brd->nasync = brd->maxports;
-	}
-
-	if (true_count != brd->nasync) {
-		if ((brd->type == PPCM) && (true_count == 64)) {
-			APR(("***WARNING**** %s configured for %d ports, has %d ports.\nPlease make SURE the EBI cable running from the card\nto each EM module is plugged into EBI IN!\n",
-				brd->name, brd->nasync, true_count));
-		}
-		else if ((brd->type == PPCM) && (true_count == 0)) {
-			APR(("***WARNING**** %s configured for %d ports, has %d ports.\nPlease make SURE the EBI cable running from the card\nto each EM module is plugged into EBI IN!\n",
-				brd->name, brd->nasync, true_count));
-		}
-		else {
-			APR(("***WARNING**** %s configured for %d ports, has %d ports.\n",
-				brd->name, brd->nasync, true_count));
-		}
-
-		brd->nasync = true_count;
-
-		/* If no ports, don't bother going any further */
-		if (!brd->nasync) {
-			brd->state = BOARD_FAILED;
-			brd->dpastatus = BD_NOFEP;
-			return(-ENXIO);
-		}
-	}
-
-	/*
-	 * Allocate channel memory that might not have been allocated
-	 * when the driver was first loaded.
-	 */
-	for (i = 0; i < brd->nasync; i++) {
-		if (!brd->channels[i]) {
-			brd->channels[i] = kzalloc(sizeof(struct channel_t), GFP_ATOMIC);
-			if (!brd->channels[i]) {
-				DPR_CORE(("%s:%d Unable to allocate memory for channel struct\n",
-				    __FILE__, __LINE__));
-			}
-		}
-	}
-
-	ch = brd->channels[0];
-	vaddr = brd->re_map_membase;
-
-	bs = (struct bs_t *) ((ulong) vaddr + CHANBUF);
-	cm = (struct cm_t *) ((ulong) vaddr + CMDBUF);
-
-	brd->bd_bs = bs;
-
-	/* Set up channel variables */
-	for (i = 0; i < brd->nasync; i++, ch = brd->channels[i], bs++) {
-
-		if (!brd->channels[i])
-			continue;
-
-		DGAP_SPINLOCK_INIT(ch->ch_lock);
-
-		/* Store all our magic numbers */
-		ch->magic = DGAP_CHANNEL_MAGIC;
-		ch->ch_tun.magic = DGAP_UNIT_MAGIC;
-		ch->ch_tun.un_type = DGAP_SERIAL;
-		ch->ch_tun.un_ch = ch;
-		ch->ch_tun.un_dev = i;
-
-		ch->ch_pun.magic = DGAP_UNIT_MAGIC;
-		ch->ch_pun.un_type = DGAP_PRINT;
-		ch->ch_pun.un_ch = ch;
-		ch->ch_pun.un_dev = i;
-
-		ch->ch_vaddr = vaddr;
-		ch->ch_bs = bs;
-		ch->ch_cm = cm;
-		ch->ch_bd = brd;
-		ch->ch_portnum = i;
-		ch->ch_digi = dgap_digi_init;
-
-		/*
-		 * Set up digi dsr and dcd bits based on altpin flag.
-		 */
-		if (dgap_config_get_altpin(brd)) {
-			ch->ch_dsr	= DM_CD;
-			ch->ch_cd	= DM_DSR;
-			ch->ch_digi.digi_flags |= DIGI_ALTPIN;
-		}
-		else {
-			ch->ch_cd	= DM_CD;
-			ch->ch_dsr	= DM_DSR;
-		}
-
-		ch->ch_taddr = vaddr + ((ch->ch_bs->tx_seg) << 4);
-		ch->ch_raddr = vaddr + ((ch->ch_bs->rx_seg) << 4);
-		ch->ch_tx_win = 0;
-		ch->ch_rx_win = 0;
-		ch->ch_tsize = readw(&(ch->ch_bs->tx_max)) + 1;
-		ch->ch_rsize = readw(&(ch->ch_bs->rx_max)) + 1;
-		ch->ch_tstart = 0;
-		ch->ch_rstart = 0;
-
-		/* .25 second delay */
-		ch->ch_close_delay = 250;
-
-		/*
-		 * Set queue water marks, interrupt mask,
-		 * and general tty parameters.
-		 */
-		ch->ch_tlw = tlw = ch->ch_tsize >= 2000 ? ((ch->ch_tsize * 5) / 8) : ch->ch_tsize / 2;
-
-		dgap_cmdw(ch, STLOW, tlw, 0);
-
-		dgap_cmdw(ch, SRLOW, ch->ch_rsize / 2, 0);
-
-		dgap_cmdw(ch, SRHIGH, 7 * ch->ch_rsize / 8, 0);
-
-		ch->ch_mistat = readb(&(ch->ch_bs->m_stat));
-
-		init_waitqueue_head(&ch->ch_flags_wait);
-		init_waitqueue_head(&ch->ch_tun.un_flags_wait);
-		init_waitqueue_head(&ch->ch_pun.un_flags_wait);
-		init_waitqueue_head(&ch->ch_sniff_wait);
-
-		/* Turn on all modem interrupts for now */
-		modem = (DM_CD | DM_DSR | DM_CTS | DM_RI);
-		writeb(modem, &(ch->ch_bs->m_int));
-
-		/*
-		 * Set edelay to 0 if interrupts are turned on,
-		 * otherwise set edelay to the usual 100.
-		 */
-		if (brd->intr_used)
-			writew(0, &(ch->ch_bs->edelay));
-		else
-			writew(100, &(ch->ch_bs->edelay));
-
-		writeb(1, &(ch->ch_bs->idata));
-	}
-
-
-	DPR_INIT(("dgap_tty_init finish\n"));
-
-	return (0);
-}
-
-
-/*
- * dgap_tty_post_uninit()
- *
- * UnInitialize any global tty related data.
- */
-void dgap_tty_post_uninit(void)
-{
-	kfree(dgap_TmpWriteBuf);
-	dgap_TmpWriteBuf = NULL;
-}
-
-
-/*
- * dgap_tty_uninit()
- *
- * Uninitialize the TTY portion of this driver.  Free all memory and
- * resources.
- */
-void dgap_tty_uninit(struct board_t *brd)
-{
-	int i = 0;
-
-	if (brd->dgap_Major_Serial_Registered) {
-		dgap_BoardsByMajor[brd->SerialDriver->major] = NULL;
-		brd->dgap_Serial_Major = 0;
-		for (i = 0; i < brd->nasync; i++) {
-			dgap_remove_tty_sysfs(brd->channels[i]->ch_tun.un_sysfs);
-			tty_unregister_device(brd->SerialDriver, i);
-		}
-		tty_unregister_driver(brd->SerialDriver);
-		kfree(brd->SerialDriver->ttys);
-		brd->SerialDriver->ttys = NULL;
-		put_tty_driver(brd->SerialDriver);
-		brd->dgap_Major_Serial_Registered = FALSE;
-	}
-
-	if (brd->dgap_Major_TransparentPrint_Registered) {
-		dgap_BoardsByMajor[brd->PrintDriver->major] = NULL;
-		brd->dgap_TransparentPrint_Major = 0;
-		for (i = 0; i < brd->nasync; i++) {
-			dgap_remove_tty_sysfs(brd->channels[i]->ch_pun.un_sysfs);
-			tty_unregister_device(brd->PrintDriver, i);
-		}
-		tty_unregister_driver(brd->PrintDriver);
-		kfree(brd->PrintDriver->ttys);
-		brd->PrintDriver->ttys = NULL;
-		put_tty_driver(brd->PrintDriver);
-		brd->dgap_Major_TransparentPrint_Registered = FALSE;
-	}
-}
-
-
-#define TMPBUFLEN (1024)
-
-/*
- * dgap_sniff - Dump data out to the "sniff" buffer if the
- * proc sniff file is opened...
- */
-static void dgap_sniff_nowait_nolock(struct channel_t *ch, uchar *text, uchar *buf, int len)
-{
-	struct timeval tv;
-	int n;
-	int r;
-	int nbuf;
-	int i;
-	int tmpbuflen;
-	char tmpbuf[TMPBUFLEN];
-	char *p = tmpbuf;
-	int too_much_data;
-
-	/* Leave if sniff not open */
-	if (!(ch->ch_sniff_flags & SNIFF_OPEN))
-		return;
-
-	do_gettimeofday(&tv);
-
-	/* Create our header for data dump */
-	p += sprintf(p, "<%ld %ld><%s><", tv.tv_sec, tv.tv_usec, text);
-	tmpbuflen = p - tmpbuf;
-
-	do {
-		too_much_data = 0;
-
-		for (i = 0; i < len && tmpbuflen < (TMPBUFLEN - 4); i++) {
-			p += sprintf(p, "%02x ", *buf);
-			buf++;
-			tmpbuflen = p - tmpbuf;
-		}
-
-		if (tmpbuflen < (TMPBUFLEN - 4)) {
-			if (i > 0)
-				p += sprintf(p - 1, "%s\n", ">");
-			else
-				p += sprintf(p, "%s\n", ">");
-		} else {
-			too_much_data = 1;
-			len -= i;
-		}
-
-		nbuf = strlen(tmpbuf);
-		p = tmpbuf;
-
-		/*
-		 *  Loop while data remains.
-		 */
-		while (nbuf > 0 && ch->ch_sniff_buf) {
-			/*
-			 *  Determine the amount of available space left in the
-			 *  buffer.  If there's none, wait until some appears.
-			 */
-			n = (ch->ch_sniff_out - ch->ch_sniff_in - 1) & SNIFF_MASK;
-
-			/*
-			 * If there is no space left to write to in our sniff buffer,
-			 * we have no choice but to drop the data.
-			 * We *cannot* sleep here waiting for space, because this
-			 * function was probably called by the interrupt/timer routines!
-			 */
-			if (n == 0) {
-				return;
-			}
-
-			/*
-			 * Copy as much data as will fit.
-			 */
-
-			if (n > nbuf)
-				n = nbuf;
-
-			r = SNIFF_MAX - ch->ch_sniff_in;
-
-			if (r <= n) {
-				memcpy(ch->ch_sniff_buf + ch->ch_sniff_in, p, r);
-
-				n -= r;
-				ch->ch_sniff_in = 0;
-				p += r;
-				nbuf -= r;
-			}
-
-			memcpy(ch->ch_sniff_buf + ch->ch_sniff_in, p, n);
-
-			ch->ch_sniff_in += n;
-			p += n;
-			nbuf -= n;
-
-			/*
-			 *  Wakeup any thread waiting for data
-			 */
-			if (ch->ch_sniff_flags & SNIFF_WAIT_DATA) {
-				ch->ch_sniff_flags &= ~SNIFF_WAIT_DATA;
-				wake_up_interruptible(&ch->ch_sniff_wait);
-			}
-		}
-
-		/*
-		 * If the user sent us too much data to push into our tmpbuf,
-		 * we need to keep looping around on all the data.
-		 */
-		if (too_much_data) {
-			p = tmpbuf;
-			tmpbuflen = 0;
-		}
-
-	} while (too_much_data);
-}
-
-
-/*=======================================================================
- *
- *      dgap_input - Process received data.
- *
- *              ch      - Pointer to channel structure.
- *
- *=======================================================================*/
-
-void dgap_input(struct channel_t *ch)
-{
-	struct board_t *bd;
-	struct bs_t	*bs;
-	struct tty_struct *tp;
-	struct tty_ldisc *ld;
-	uint	rmask;
-	uint	head;
-	uint	tail;
-	int	data_len;
-	ulong	lock_flags;
-	ulong   lock_flags2;
-	int flip_len;
-	int len = 0;
-	int n = 0;
-	uchar *buf;
-	uchar tmpchar;
-	int s = 0;
-
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return;
-
-	tp = ch->ch_tun.un_tty;
-
-	bs  = ch->ch_bs;
-	if (!bs) {
-		return;
-	}
-
-	bd = ch->ch_bd;
-	if(!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_READ(("dgap_input start\n"));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	/*
-	 *      Figure the number of characters in the buffer.
-	 *      Exit immediately if none.
-	 */
-
-	rmask = ch->ch_rsize - 1;
-
-	head = readw(&(bs->rx_head));
-	head &= rmask;
-	tail = readw(&(bs->rx_tail));
-	tail &= rmask;
-
-	data_len = (head - tail) & rmask;
-
-	if (data_len == 0) {
-		writeb(1, &(bs->idata));
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		DPR_READ(("No data on port %d\n", ch->ch_portnum));
-		return;
-	}
-
-	/*
-	 * If the device is not open, or CREAD is off, flush
-	 * input data and return immediately.
-	 */
-	if ((bd->state != BOARD_READY) || !tp  || (tp->magic != TTY_MAGIC) ||
-            !(ch->ch_tun.un_flags & UN_ISOPEN) || !(tp->termios.c_cflag & CREAD) ||
-	    (ch->ch_tun.un_flags & UN_CLOSING)) {
-
-		DPR_READ(("input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum));
-		DPR_READ(("input. tp: %p tp->magic: %x MAGIC:%x ch flags: %x\n",
-			tp, tp ? tp->magic : 0, TTY_MAGIC, ch->ch_tun.un_flags));
-		writew(head, &(bs->rx_tail));
-		writeb(1, &(bs->idata));
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return;
-	}
-
-	/*
-	 * If we are throttled, simply don't read any data.
-	 */
-	if (ch->ch_flags & CH_RXBLOCK) {
-		writeb(1, &(bs->idata));
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		DPR_READ(("Port %d throttled, not reading any data. head: %x tail: %x\n",
-			ch->ch_portnum, head, tail));
-		return;
-	}
-
-	/*
-	 *      Ignore oruns.
-	 */
-	tmpchar = readb(&(bs->orun));
-	if (tmpchar) {
-		ch->ch_err_overrun++;
-		writeb(0, &(bs->orun));
-	}
-
-	DPR_READ(("dgap_input start 2\n"));
-
-	/* Decide how much data we can send into the tty layer */
-	flip_len = TTY_FLIPBUF_SIZE;
-
-	/* Chop down the length, if needed */
-	len = min(data_len, flip_len);
-	len = min(len, (N_TTY_BUF_SIZE - 1));
-
-	ld = tty_ldisc_ref(tp);
-
-#ifdef TTY_DONT_FLIP
-	/*
-	 * If the DONT_FLIP flag is on, don't flush our buffer, and act
-	 * like the ld doesn't have any space to put the data right now.
-	 */
-	if (test_bit(TTY_DONT_FLIP, &tp->flags))
-		len = 0;
-#endif
-
-	/*
-	 * If we were unable to get a reference to the ld,
-	 * don't flush our buffer, and act like the ld doesn't
-	 * have any space to put the data right now.
-	 */
-	if (!ld) {
-		len = 0;
-	} else {
-		/*
-		 * If ld doesn't have a pointer to a receive_buf function,
-		 * flush the data, then act like the ld doesn't have any
-		 * space to put the data right now.
-		 */
-		if (!ld->ops->receive_buf) {
-			writew(head, &(bs->rx_tail));
-			len = 0;
-		}
-	}
-
-	if (len <= 0) {
-		writeb(1, &(bs->idata));
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		DPR_READ(("dgap_input 1 - finish\n"));
-		if (ld)
-			tty_ldisc_deref(ld);
-		return;
-	}
-
-	buf = ch->ch_bd->flipbuf;
-	n = len;
-
-	/*
-	 * n now contains the most amount of data we can copy,
-	 * bounded either by our buffer size or the amount
-	 * of data the card actually has pending...
-	 */
-	while (n) {
-
-		s = ((head >= tail) ? head : ch->ch_rsize) - tail;
-		s = min(s, n);
-
-		if (s <= 0)
-			break;
-
-		memcpy_fromio(buf, (char *) ch->ch_raddr + tail, s);
-		dgap_sniff_nowait_nolock(ch, "USER READ", buf, s);
-
-		tail += s;
-		buf += s;
-
-		n -= s;
-		/* Flip queue if needed */
-		tail &= rmask;
-	}
-
-	writew(tail, &(bs->rx_tail));
-	writeb(1, &(bs->idata));
-	ch->ch_rxcount += len;
-
-	/*
-	 * If we are completely raw, we don't need to go through a lot
-	 * of the tty layers that exist.
-	 * In this case, we take the shortest and fastest route we
-	 * can to relay the data to the user.
-	 *
-	 * On the other hand, if we are not raw, we need to go through
-	 * the tty layer, which has its API more well defined.
-	 */
-	if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
-		dgap_parity_scan(ch, ch->ch_bd->flipbuf, ch->ch_bd->flipflagbuf, &len);
-
-		len = tty_buffer_request_room(tp->port, len);
-		tty_insert_flip_string_flags(tp->port, ch->ch_bd->flipbuf,
-			ch->ch_bd->flipflagbuf, len);
-	}
-	else {
-		len = tty_buffer_request_room(tp->port, len);
-		tty_insert_flip_string(tp->port, ch->ch_bd->flipbuf, len);
-	}
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	/* Tell the tty layer its okay to "eat" the data now */
-	tty_flip_buffer_push(tp->port);
-
-	if (ld)
-		tty_ldisc_deref(ld);
-
-	DPR_READ(("dgap_input - finish\n"));
-}
-
-
-/************************************************************************
- * Determines when CARRIER changes state and takes appropriate
- * action.
- ************************************************************************/
-void dgap_carrier(struct channel_t *ch)
-{
-	struct board_t *bd;
-
-        int virt_carrier = 0;
-        int phys_carrier = 0;
-
-	DPR_CARR(("dgap_carrier called...\n"));
-
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return;
-
-	bd = ch->ch_bd;
-
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	/* Make sure altpin is always set correctly */
-	if (ch->ch_digi.digi_flags & DIGI_ALTPIN) {
-		ch->ch_dsr      = DM_CD;
-		ch->ch_cd       = DM_DSR;
-	}
-	else {
-		ch->ch_dsr      = DM_DSR;
-		ch->ch_cd       = DM_CD;
-	}
-
-	if (ch->ch_mistat & D_CD(ch)) {
-		DPR_CARR(("mistat: %x  D_CD: %x\n", ch->ch_mistat, D_CD(ch)));
-		phys_carrier = 1;
-	}
-
-	if (ch->ch_digi.digi_flags & DIGI_FORCEDCD) {
-		virt_carrier = 1;
-	}
-
-	if (ch->ch_c_cflag & CLOCAL) {
-		virt_carrier = 1;
-	}
-
-
-	DPR_CARR(("DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier));
-
-	/*
-	 * Test for a VIRTUAL carrier transition to HIGH.
-	 */
-	if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
-
-		/*
-		 * When carrier rises, wake any threads waiting
-		 * for carrier in the open routine.
-		 */
-
-		DPR_CARR(("carrier: virt DCD rose\n"));
-
-		if (waitqueue_active(&(ch->ch_flags_wait)))
-			wake_up_interruptible(&ch->ch_flags_wait);
-	}
-
-	/*
-	 * Test for a PHYSICAL carrier transition to HIGH.
-	 */
-	if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
-
-		/*
-		 * When carrier rises, wake any threads waiting
-		 * for carrier in the open routine.
-		 */
-
-		DPR_CARR(("carrier: physical DCD rose\n"));
-
-		if (waitqueue_active(&(ch->ch_flags_wait)))
-			wake_up_interruptible(&ch->ch_flags_wait);
-	}
-
-	/*
-	 *  Test for a PHYSICAL transition to low, so long as we aren't
-	 *  currently ignoring physical transitions (which is what "virtual
-	 *  carrier" indicates).
-	 *
-	 *  The transition of the virtual carrier to low really doesn't
-	 *  matter... it really only means "ignore carrier state", not
-	 *  "make pretend that carrier is there".
-	 */
-	if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) &&
-	    (phys_carrier == 0))
-	{
-
-		/*
-		 *   When carrier drops:
-		 *
-		 *   Drop carrier on all open units.
-		 *
-		 *   Flush queues, waking up any task waiting in the
-		 *   line discipline.
-		 *
-		 *   Send a hangup to the control terminal.
-		 *
-		 *   Enable all select calls.
-		 */
-		if (waitqueue_active(&(ch->ch_flags_wait)))
-			wake_up_interruptible(&ch->ch_flags_wait);
-
-		if (ch->ch_tun.un_open_count > 0) {
-			DPR_CARR(("Sending tty hangup\n"));
-			tty_hangup(ch->ch_tun.un_tty);
-		}
-
-		if (ch->ch_pun.un_open_count > 0) {
-			DPR_CARR(("Sending pr hangup\n"));
-			tty_hangup(ch->ch_pun.un_tty);
-		}
-	}
-
-	/*
-	 *  Make sure that our cached values reflect the current reality.
-	 */
-	if (virt_carrier == 1)
-		ch->ch_flags |= CH_FCAR;
-	else
-		ch->ch_flags &= ~CH_FCAR;
-
-	if (phys_carrier == 1)
-		ch->ch_flags |= CH_CD;
-	else
-		ch->ch_flags &= ~CH_CD;
-}
-
-
-/************************************************************************
- *
- * TTY Entry points and helper functions
- *
- ************************************************************************/
-
-/*
- * dgap_tty_open()
- *
- */
-static int dgap_tty_open(struct tty_struct *tty, struct file *file)
-{
-	struct board_t	*brd;
-	struct channel_t *ch;
-	struct un_t	*un;
-	struct bs_t	*bs;
-	uint		major = 0;
-	uint		minor = 0;
-	int		rc = 0;
-	ulong		lock_flags;
-	ulong		lock_flags2;
-	u16		head;
-
-	rc = 0;
-
-	major = MAJOR(tty_devnum(tty));
-	minor = MINOR(tty_devnum(tty));
-
-	if (major > 255) {
-		return -ENXIO;
-	}
-
-	/* Get board pointer from our array of majors we have allocated */
-	brd = dgap_BoardsByMajor[major];
-	if (!brd) {
-		return -ENXIO;
-	}
-
-	/*
-	 * If board is not yet up to a state of READY, go to
-	 * sleep waiting for it to happen or they cancel the open.
-	 */
-	rc = wait_event_interruptible(brd->state_wait,
-		(brd->state & BOARD_READY));
-
-	if (rc) {
-		return rc;
-	}
-
-	DGAP_LOCK(brd->bd_lock, lock_flags);
-
-	/* The wait above should guarantee this cannot happen */
-	if (brd->state != BOARD_READY) {
-		DGAP_UNLOCK(brd->bd_lock, lock_flags);
-		return -ENXIO;
-	}
-
-	/* If opened device is greater than our number of ports, bail. */
-	if (MINOR(tty_devnum(tty)) > brd->nasync) {
-		DGAP_UNLOCK(brd->bd_lock, lock_flags);
-		return -ENXIO;
-	}
-
-	ch = brd->channels[minor];
-	if (!ch) {
-		DGAP_UNLOCK(brd->bd_lock, lock_flags);
-		return -ENXIO;
-	}
-
-	/* Grab channel lock */
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	/* Figure out our type */
-	if (major == brd->dgap_Serial_Major) {
-		un = &brd->channels[minor]->ch_tun;
-		un->un_type = DGAP_SERIAL;
-	}
-	else if (major == brd->dgap_TransparentPrint_Major) {
-		un = &brd->channels[minor]->ch_pun;
-		un->un_type = DGAP_PRINT;
-	}
-	else {
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(brd->bd_lock, lock_flags);
-		DPR_OPEN(("%d Unknown TYPE!\n", __LINE__));
-		return -ENXIO;
-	}
-
-	/* Store our unit into driver_data, so we always have it available. */
-	tty->driver_data = un;
-
-	DPR_OPEN(("Open called. MAJOR: %d MINOR:%d unit: %p NAME: %s\n",
-		MAJOR(tty_devnum(tty)), MINOR(tty_devnum(tty)), un, brd->name));
-
-	/*
-	 * Error if channel info pointer is NULL.
-	 */
-	bs = ch->ch_bs;
-	if (!bs) {
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(brd->bd_lock, lock_flags);
-		DPR_OPEN(("%d BS is 0!\n", __LINE__));
-		return -ENXIO;
-        }
-
-	DPR_OPEN(("%d: tflag=%x  pflag=%x\n", __LINE__, ch->ch_tun.un_flags, ch->ch_pun.un_flags));
-
-	/*
-	 * Initialize tty's
-	 */
-	if (!(un->un_flags & UN_ISOPEN)) {
-		/* Store important variables. */
-		un->un_tty     = tty;
-
-		/* Maybe do something here to the TTY struct as well? */
-	}
-
-	/*
-	 * Initialize if neither terminal or printer is open.
-	 */
-	if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) {
-
-		DPR_OPEN(("dgap_open: initializing channel in open...\n"));
-
-		ch->ch_mforce = 0;
-		ch->ch_mval = 0;
-
-		/*
-		 * Flush input queue.
-		 */
-		head = readw(&(bs->rx_head));
-		writew(head, &(bs->rx_tail));
-
-		ch->ch_flags = 0;
-		ch->pscan_state = 0;
-		ch->pscan_savechar = 0;
-
-		ch->ch_c_cflag   = tty->termios.c_cflag;
-		ch->ch_c_iflag   = tty->termios.c_iflag;
-		ch->ch_c_oflag   = tty->termios.c_oflag;
-		ch->ch_c_lflag   = tty->termios.c_lflag;
-		ch->ch_startc = tty->termios.c_cc[VSTART];
-		ch->ch_stopc  = tty->termios.c_cc[VSTOP];
-
-		/* TODO: flush our TTY struct here? */
-	}
-
-	dgap_carrier(ch);
-	/*
-	 * Run param in case we changed anything
-	 */
-	dgap_param(tty);
-
-	/*
-	 * follow protocol for opening port
-	 */
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(brd->bd_lock, lock_flags);
-
-	rc = dgap_block_til_ready(tty, file, ch);
-
-	if (!un->un_tty) {
-		return -ENODEV;
-	}
-
-	if (rc) {
-		DPR_OPEN(("dgap_tty_open returning after dgap_block_til_ready "
-			"with %d\n", rc));
-	}
-
-	/* No going back now, increment our unit and channel counters */
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-	ch->ch_open_count++;
-	un->un_open_count++;
-	un->un_flags |= (UN_ISOPEN);
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	DPR_OPEN(("dgap_tty_open finished\n"));
-	return (rc);
-}
-
-
-/*
- * dgap_block_til_ready()
- *
- * Wait for DCD, if needed.
- */
-static int dgap_block_til_ready(struct tty_struct *tty, struct file *file, struct channel_t *ch)
-{
-	int retval = 0;
-	struct un_t *un = NULL;
-	ulong   lock_flags;
-	uint	old_flags = 0;
-	int sleep_on_un_flags = 0;
-
-	if (!tty || tty->magic != TTY_MAGIC || !file || !ch || ch->magic != DGAP_CHANNEL_MAGIC) {
-		return (-ENXIO);
-	}
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC) {
-		return (-ENXIO);
-	}
-
-	DPR_OPEN(("dgap_block_til_ready - before block.\n"));
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-
-	ch->ch_wopen++;
-
-	/* Loop forever */
-	while (1) {
-
-		sleep_on_un_flags = 0;
-
-		/*
-		 * If board has failed somehow during our sleep, bail with error.
-		 */
-		if (ch->ch_bd->state == BOARD_FAILED) {
-			retval = -ENXIO;
-			break;
-		}
-
-		/* If tty was hung up, break out of loop and set error. */
-		if (tty_hung_up_p(file)) {
-			retval = -EAGAIN;
-			break;
-		}
-
-		/*
-		 * If either unit is in the middle of the fragile part of close,
-		 * we just cannot touch the channel safely.
-		 * Go back to sleep, knowing that when the channel can be
-		 * touched safely, the close routine will signal the
-		 * ch_wait_flags to wake us back up.
-		 */
-		if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_CLOSING)) {
-
-			/*
-			 * Our conditions to leave cleanly and happily:
-			 * 1) NONBLOCKING on the tty is set.
-			 * 2) CLOCAL is set.
-			 * 3) DCD (fake or real) is active.
-			 */
-
-			if (file->f_flags & O_NONBLOCK) {
-				break;
-			}
-
-			if (tty->flags & (1 << TTY_IO_ERROR)) {
-				break;
-			}
-
-			if (ch->ch_flags & CH_CD) {
-				DPR_OPEN(("%d: ch_flags: %x\n", __LINE__, ch->ch_flags));
-				break;
-			}
-
-			if (ch->ch_flags & CH_FCAR) {
-				DPR_OPEN(("%d: ch_flags: %x\n", __LINE__, ch->ch_flags));
-				break;
-			}
-		}
-		else {
-			sleep_on_un_flags = 1;
-		}
-
-		/*
-		 * If there is a signal pending, the user probably
-		 * interrupted (ctrl-c) us.
-		 * Leave loop with error set.
-		 */
-		if (signal_pending(current)) {
-			DPR_OPEN(("%d: signal pending...\n", __LINE__));
-			retval = -ERESTARTSYS;
-			break;
-		}
-
-		DPR_OPEN(("dgap_block_til_ready - blocking.\n"));
-
-		/*
-		 * Store the flags before we let go of channel lock
-		 */
-		if (sleep_on_un_flags)
-			old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags;
-		else
-			old_flags = ch->ch_flags;
-
-		/*
-		 * Let go of channel lock before calling schedule.
-		 * Our poller will get any FEP events and wake us up when DCD
-		 * eventually goes active.
-		 */
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-		DPR_OPEN(("Going to sleep on %s flags...\n",
-			(sleep_on_un_flags ? "un" : "ch")));
-
-		/*
-		 * Wait for something in the flags to change from the current value.
-		 */
-		if (sleep_on_un_flags) {
-			retval = wait_event_interruptible(un->un_flags_wait,
-				(old_flags != (ch->ch_tun.un_flags | ch->ch_pun.un_flags)));
-		}
-		else {
-			retval = wait_event_interruptible(ch->ch_flags_wait,
-				(old_flags != ch->ch_flags));
-		}
-
-		DPR_OPEN(("After sleep... retval: %x\n", retval));
-
-		/*
-		 * We got woken up for some reason.
-		 * Before looping around, grab our channel lock.
-		 */
-		DGAP_LOCK(ch->ch_lock, lock_flags);
-	}
-
-	ch->ch_wopen--;
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	DPR_OPEN(("dgap_block_til_ready - after blocking.\n"));
-
-	if (retval) {
-		DPR_OPEN(("dgap_block_til_ready - done. error. retval: %x\n", retval));
-		return(retval);
-	}
-
-	DPR_OPEN(("dgap_block_til_ready - done no error. jiffies: %lu\n", jiffies));
-
-	return(0);
-}
-
-
-/*
- * dgap_tty_hangup()
- *
- * Hangup the port.  Like a close, but don't wait for output to drain.
- */
-static void dgap_tty_hangup(struct tty_struct *tty)
-{
-	struct board_t	*bd;
-	struct channel_t *ch;
-	struct un_t	*un;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_CLOSE(("dgap_hangup called. ch->ch_open_count: %d un->un_open_count: %d\n",
-		ch->ch_open_count, un->un_open_count));
-
-	/* flush the transmit queues */
-	dgap_tty_flush_buffer(tty);
-
-	DPR_CLOSE(("dgap_hangup finished. ch->ch_open_count: %d un->un_open_count: %d\n",
-		ch->ch_open_count, un->un_open_count));
-}
-
-
-
-/*
- * dgap_tty_close()
- *
- */
-static void dgap_tty_close(struct tty_struct *tty, struct file *file)
-{
-	struct ktermios *ts;
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	ulong lock_flags;
-	int rc = 0;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	ts = &tty->termios;
-
-	DPR_CLOSE(("Close called\n"));
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-
-	/*
-	 * Determine if this is the last close or not - and if we agree about
-	 * which type of close it is with the Line Discipline
-	 */
-	if ((tty->count == 1) && (un->un_open_count != 1)) {
-		/*
-		 * Uh, oh.  tty->count is 1, which means that the tty
-		 * structure will be freed.  un_open_count should always
-		 * be one in these conditions.  If it's greater than
-		 * one, we've got real problems, since it means the
-		 * serial port won't be shutdown.
-		 */
-		APR(("tty->count is 1, un open count is %d\n", un->un_open_count));
-		un->un_open_count = 1;
-	}
-
-	if (--un->un_open_count < 0) {
-		APR(("bad serial port open count of %d\n", un->un_open_count));
-		un->un_open_count = 0;
-	}
-
-	ch->ch_open_count--;
-
-	if (ch->ch_open_count && un->un_open_count) {
-		DPR_CLOSE(("dgap_tty_close: not last close ch: %d un:%d\n",
-			ch->ch_open_count, un->un_open_count));
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-                return;
-        }
-
-	/* OK, its the last close on the unit */
-	DPR_CLOSE(("dgap_tty_close - last close on unit procedures\n"));
-
-	un->un_flags |= UN_CLOSING;
-
-	tty->closing = 1;
-
-	/*
-	 * Only officially close channel if count is 0 and
-         * DIGI_PRINTER bit is not set.
-	 */
-	if ((ch->ch_open_count == 0) && !(ch->ch_digi.digi_flags & DIGI_PRINTER)) {
-
-		ch->ch_flags &= ~(CH_RXBLOCK);
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-		/* wait for output to drain */
-		/* This will also return if we take an interrupt */
-
-		DPR_CLOSE(("Calling wait_for_drain\n"));
-		rc = dgap_wait_for_drain(tty);
-		DPR_CLOSE(("After calling wait_for_drain\n"));
-
-		if (rc) {
-			DPR_BASIC(("dgap_tty_close - bad return: %d ", rc));
-		}
-
-		dgap_tty_flush_buffer(tty);
-		tty_ldisc_flush(tty);
-
-		DGAP_LOCK(ch->ch_lock, lock_flags);
-
-		tty->closing = 0;
-
-		/*
-		 * If we have HUPCL set, lower DTR and RTS
-		 */
-		if (ch->ch_c_cflag & HUPCL ) {
-			DPR_CLOSE(("Close. HUPCL set, dropping DTR/RTS\n"));
-			ch->ch_mostat &= ~(D_RTS(ch)|D_DTR(ch));
-			dgap_cmdb( ch, SMODEM, 0, D_DTR(ch)|D_RTS(ch), 0 );
-
-			/*
-			 * Go to sleep to ensure RTS/DTR
-			 * have been dropped for modems to see it.
-			 */
-			if (ch->ch_close_delay) {
-				DPR_CLOSE(("Close. Sleeping for RTS/DTR drop\n"));
-
-				DGAP_UNLOCK(ch->ch_lock, lock_flags);
-				dgap_ms_sleep(ch->ch_close_delay);
-				DGAP_LOCK(ch->ch_lock, lock_flags);
-
-				DPR_CLOSE(("Close. After sleeping for RTS/DTR drop\n"));
-			}
-		}
-
-		ch->pscan_state = 0;
-		ch->pscan_savechar = 0;
-		ch->ch_baud_info = 0;
-
-	}
-
-	/*
-	 * turn off print device when closing print device.
-	 */
-	if ((un->un_type == DGAP_PRINT)  && (ch->ch_flags & CH_PRON) ) {
-		dgap_wmove(ch, ch->ch_digi.digi_offstr,
-			(int) ch->ch_digi.digi_offlen);
-		ch->ch_flags &= ~CH_PRON;
-	}
-
-	un->un_tty = NULL;
-	un->un_flags &= ~(UN_ISOPEN | UN_CLOSING);
-	tty->driver_data = NULL;
-
-	DPR_CLOSE(("Close. Doing wakeups\n"));
-	wake_up_interruptible(&ch->ch_flags_wait);
-	wake_up_interruptible(&un->un_flags_wait);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-        DPR_BASIC(("dgap_tty_close - complete\n"));
-}
-
-
-/*
- * dgap_tty_chars_in_buffer()
- *
- * Return number of characters that have not been transmitted yet.
- *
- * This routine is used by the line discipline to determine if there
- * is data waiting to be transmitted/drained/flushed or not.
- */
-static int dgap_tty_chars_in_buffer(struct tty_struct *tty)
-{
-	struct board_t *bd = NULL;
-	struct channel_t *ch = NULL;
-	struct un_t *un = NULL;
-	struct bs_t *bs = NULL;
-	uchar tbusy;
-	uint chars = 0;
-	u16 thead, ttail, tmask, chead, ctail;
-	ulong   lock_flags = 0;
-	ulong   lock_flags2 = 0;
-
-	if (tty == NULL)
-		return(0);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (0);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (0);
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return (0);
-
-        bs = ch->ch_bs;
-	if (!bs)
-		return (0);
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	tmask = (ch->ch_tsize - 1);
-
-	/* Get Transmit queue pointers */
-	thead = readw(&(bs->tx_head)) & tmask;
-	ttail = readw(&(bs->tx_tail)) & tmask;
-
-	/* Get tbusy flag */
-	tbusy = readb(&(bs->tbusy));
-
-	/* Get Command queue pointers */
-	chead = readw(&(ch->ch_cm->cm_head));
-	ctail = readw(&(ch->ch_cm->cm_tail));
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	/*
-	 * The only way we know for sure if there is no pending
-	 * data left to be transferred, is if:
-	 * 1) Transmit head and tail are equal (empty).
-	 * 2) Command queue head and tail are equal (empty).
-	 * 3) The "TBUSY" flag is 0. (Transmitter not busy).
- 	 */
-
-	if ((ttail == thead) && (tbusy == 0) && (chead == ctail)) {
-		chars = 0;
-	}
-	else {
-		if (thead >= ttail)
-			chars = thead - ttail;
-		else
-			chars = thead - ttail + ch->ch_tsize;
-		/*
-		 * Fudge factor here.
-		 * If chars is zero, we know that the command queue had
-		 * something in it or tbusy was set.  Because we cannot
-		 * be sure if there is still some data to be transmitted,
-		 * lets lie, and tell ld we have 1 byte left.
-		 */
-		if (chars == 0) {
-			/*
-			 * If TBUSY is still set, and our tx buffers are empty,
-			 * force the firmware to send me another wakeup after
-			 * TBUSY has been cleared.
-			 */
-			if (tbusy != 0) {
-				DGAP_LOCK(ch->ch_lock, lock_flags);
-				un->un_flags |= UN_EMPTY;
-				writeb(1, &(bs->iempty));
-				DGAP_UNLOCK(ch->ch_lock, lock_flags);
-			}
-			chars = 1;
-		}
-	}
-
- 	DPR_WRITE(("dgap_tty_chars_in_buffer. Port: %x - %d (head: %d tail: %d tsize: %d)\n",
-		ch->ch_portnum, chars, thead, ttail, ch->ch_tsize));
-        return(chars);
-}
-
-
-static int dgap_wait_for_drain(struct tty_struct *tty)
-{
-	struct channel_t *ch;
-	struct un_t *un;
-	struct bs_t *bs;
-	int ret = -EIO;
-	uint count = 1;
-	ulong   lock_flags = 0;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return ret;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return ret;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return ret;
-
-        bs = ch->ch_bs;
-	if (!bs)
-		return ret;
-
-	ret = 0;
-
-	DPR_DRAIN(("dgap_wait_for_drain start\n"));
-
-	/* Loop until data is drained */
-	while (count != 0) {
-
-		count = dgap_tty_chars_in_buffer(tty);
-
-		if (count == 0)
-			break;
-
-		/* Set flag waiting for drain */
-		DGAP_LOCK(ch->ch_lock, lock_flags);
-		un->un_flags |= UN_EMPTY;
-		writeb(1, &(bs->iempty));
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-		/* Go to sleep till we get woken up */
-		ret = wait_event_interruptible(un->un_flags_wait, ((un->un_flags & UN_EMPTY) == 0));
-		/* If ret is non-zero, user ctrl-c'ed us */
-		if (ret) {
-			break;
-		}
-	}
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-	un->un_flags &= ~(UN_EMPTY);
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	DPR_DRAIN(("dgap_wait_for_drain finish\n"));
-	return (ret);
-}
-
-
-/*
- * dgap_maxcps_room
- *
- * Reduces bytes_available to the max number of characters
- * that can be sent currently given the maxcps value, and
- * returns the new bytes_available.  This only affects printer
- * output.
- */
-static int dgap_maxcps_room(struct tty_struct *tty, int bytes_available)
-{
-	struct channel_t *ch = NULL;
-	struct un_t *un = NULL;
-
-	if (tty == NULL)
-		return (bytes_available);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (bytes_available);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (bytes_available);
-
-	/*
-	 * If its not the Transparent print device, return
-	 * the full data amount.
-	 */
-	if (un->un_type != DGAP_PRINT)
-		return (bytes_available);
-
-	if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0 ) {
-		int cps_limit = 0;
-		unsigned long current_time = jiffies;
-		unsigned long buffer_time = current_time +
-			(HZ * ch->ch_digi.digi_bufsize) / ch->ch_digi.digi_maxcps;
-
-		if (ch->ch_cpstime < current_time) {
-			/* buffer is empty */
-			ch->ch_cpstime = current_time;            /* reset ch_cpstime */
-			cps_limit = ch->ch_digi.digi_bufsize;
-		}
-		else if (ch->ch_cpstime < buffer_time) {
-			/* still room in the buffer */
-			cps_limit = ((buffer_time - ch->ch_cpstime) * ch->ch_digi.digi_maxcps) / HZ;
-		}
-		else {
-			/* no room in the buffer */
-			cps_limit = 0;
-		}
-
-		bytes_available = min(cps_limit, bytes_available);
-	}
-
-	return (bytes_available);
-}
-
-
-static inline void dgap_set_firmware_event(struct un_t *un, unsigned int event)
-{
-	struct channel_t *ch = NULL;
-	struct bs_t *bs = NULL;
-
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return;
-        bs = ch->ch_bs;
-	if (!bs)
-		return;
-
-	if ((event & UN_LOW) != 0) {
-		if ((un->un_flags & UN_LOW) == 0) {
-			un->un_flags |= UN_LOW;
-			writeb(1, &(bs->ilow));
-		}
-	}
-	if ((event & UN_LOW) != 0) {
-		if ((un->un_flags & UN_EMPTY) == 0) {
-			un->un_flags |= UN_EMPTY;
-			writeb(1, &(bs->iempty));
-		}
-	}
-}
-
-
-/*
- * dgap_tty_write_room()
- *
- * Return space available in Tx buffer
- */
-static int dgap_tty_write_room(struct tty_struct *tty)
-{
-	struct channel_t *ch = NULL;
-	struct un_t *un = NULL;
-	struct bs_t *bs = NULL;
-	u16 head, tail, tmask;
-	int ret = 0;
-	ulong   lock_flags = 0;
-
-	if (tty == NULL || dgap_TmpWriteBuf == NULL)
-		return(0);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (0);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (0);
-
-        bs = ch->ch_bs;
-	if (!bs)
-		return (0);
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-
-	tmask = ch->ch_tsize - 1;
-	head = readw(&(bs->tx_head)) & tmask;
-	tail = readw(&(bs->tx_tail)) & tmask;
-
-        if ((ret = tail - head - 1) < 0)
-                ret += ch->ch_tsize;
-
-	/* Limit printer to maxcps */
-	ret = dgap_maxcps_room(tty, ret);
-
-	/*
-	 * If we are printer device, leave space for
-	 * possibly both the on and off strings.
-	 */
-	if (un->un_type == DGAP_PRINT) {
-		if (!(ch->ch_flags & CH_PRON))
-			ret -= ch->ch_digi.digi_onlen;
-		ret -= ch->ch_digi.digi_offlen;
-	}
-	else {
-		if (ch->ch_flags & CH_PRON)
-			ret -= ch->ch_digi.digi_offlen;
-	}
-
-	if (ret < 0)
-		ret = 0;
-
-	/*
-	 * Schedule FEP to wake us up if needed.
-	 *
-	 * TODO:  This might be overkill...
-	 * Do we really need to schedule callbacks from the FEP
-	 * in every case?  Can we get smarter based on ret?
-	 */
-	dgap_set_firmware_event(un, UN_LOW | UN_EMPTY);
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	DPR_WRITE(("dgap_tty_write_room - %d tail: %d head: %d\n", ret, tail, head));
-
-        return(ret);
-}
-
-
-/*
- * dgap_tty_put_char()
- *
- * Put a character into ch->ch_buf
- *
- *      - used by the line discipline for OPOST processing
- */
-static int dgap_tty_put_char(struct tty_struct *tty, unsigned char c)
-{
-	/*
-	 * Simply call tty_write.
-	 */
-	DPR_WRITE(("dgap_tty_put_char called\n"));
-	dgap_tty_write(tty, &c, 1);
-	return 1;
-}
-
-
-/*
- * dgap_tty_write()
- *
- * Take data from the user or kernel and send it out to the FEP.
- * In here exists all the Transparent Print magic as well.
- */
-static int dgap_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
-{
-	struct channel_t *ch = NULL;
-	struct un_t *un = NULL;
-	struct bs_t *bs = NULL;
-	char *vaddr = NULL;
-	u16 head, tail, tmask, remain;
-	int bufcount = 0, n = 0;
-	int orig_count = 0;
-	ulong lock_flags;
-	int from_user = 0;
-
-	if (tty == NULL || dgap_TmpWriteBuf == NULL)
-		return(0);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (0);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return(0);
-
-        bs = ch->ch_bs;
-	if (!bs)
-		return(0);
-
-	if (!count)
-		return(0);
-
-	DPR_WRITE(("dgap_tty_write: Port: %x tty=%p user=%d len=%d\n",
-		ch->ch_portnum, tty, from_user, count));
-
-	/*
-	 * Store original amount of characters passed in.
-	 * This helps to figure out if we should ask the FEP
-	 * to send us an event when it has more space available.
-	 */
-	orig_count = count;
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-
-	/* Get our space available for the channel from the board */
-	tmask = ch->ch_tsize - 1;
-	head = readw(&(bs->tx_head)) & tmask;
-	tail = readw(&(bs->tx_tail)) & tmask;
-
-	if ((bufcount = tail - head - 1) < 0)
-		bufcount += ch->ch_tsize;
-
-	DPR_WRITE(("%d: bufcount: %x count: %x tail: %x head: %x tmask: %x\n",
-		__LINE__, bufcount, count, tail, head, tmask));
-
-	/*
-	 * Limit printer output to maxcps overall, with bursts allowed
-	 * up to bufsize characters.
-	 */
-	bufcount = dgap_maxcps_room(tty, bufcount);
-
-	/*
-	 * Take minimum of what the user wants to send, and the
-	 * space available in the FEP buffer.
-	 */
-	count = min(count, bufcount);
-
-	/*
-	 * Bail if no space left.
-	 */
-	if (count <= 0) {
-		dgap_set_firmware_event(un, UN_LOW | UN_EMPTY);
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-		return(0);
-	}
-
-	/*
-	 * Output the printer ON string, if we are in terminal mode, but
-	 * need to be in printer mode.
-	 */
-	if ((un->un_type == DGAP_PRINT) && !(ch->ch_flags & CH_PRON)) {
-		dgap_wmove(ch, ch->ch_digi.digi_onstr,
-		    (int) ch->ch_digi.digi_onlen);
-		head = readw(&(bs->tx_head)) & tmask;
-		ch->ch_flags |= CH_PRON;
-	}
-
-	/*
-	 * On the other hand, output the printer OFF string, if we are
-	 * currently in printer mode, but need to output to the terminal.
-	 */
-	if ((un->un_type != DGAP_PRINT) && (ch->ch_flags & CH_PRON)) {
-		dgap_wmove(ch, ch->ch_digi.digi_offstr,
-			(int) ch->ch_digi.digi_offlen);
-		head = readw(&(bs->tx_head)) & tmask;
-		ch->ch_flags &= ~CH_PRON;
-	}
-
-	/*
-	 * If there is nothing left to copy, or I can't handle any more data, leave.
-	 */
-	if (count <= 0) {
-		dgap_set_firmware_event(un, UN_LOW | UN_EMPTY);
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-		return(0);
-	}
-
-	if (from_user) {
-
-		count = min(count, WRITEBUFLEN);
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-		/*
-		 * If data is coming from user space, copy it into a temporary
-		 * buffer so we don't get swapped out while doing the copy to
-		 * the board.
-		 */
-		/* we're allowed to block if it's from_user */
-		if (down_interruptible(&dgap_TmpWriteSem)) {
-			return (-EINTR);
-		}
-
-		if (copy_from_user(dgap_TmpWriteBuf, (const uchar __user *) buf, count)) {
-			up(&dgap_TmpWriteSem);
-			printk("Write: Copy from user failed!\n");
-			return -EFAULT;
-		}
-
-		DGAP_LOCK(ch->ch_lock, lock_flags);
-
-		buf = dgap_TmpWriteBuf;
-	}
-
-	n = count;
-
-	/*
-	 * If the write wraps over the top of the circular buffer,
-	 * move the portion up to the wrap point, and reset the
-	 * pointers to the bottom.
-	 */
-	remain = ch->ch_tstart + ch->ch_tsize - head;
-
-	if (n >= remain) {
-		n -= remain;
-		vaddr = ch->ch_taddr + head;
-
-		memcpy_toio(vaddr, (uchar *) buf, remain);
-		dgap_sniff_nowait_nolock(ch, "USER WRITE", (uchar *) buf, remain);
-
-		head = ch->ch_tstart;
-		buf += remain;
-	}
-
-	if (n > 0) {
-
-		/*
-		 * Move rest of data.
-		 */
-		vaddr = ch->ch_taddr + head;
-		remain = n;
-
-		memcpy_toio(vaddr, (uchar *) buf, remain);
-		dgap_sniff_nowait_nolock(ch, "USER WRITE", (uchar *) buf, remain);
-
-		head += remain;
-
-	}
-
-	if (count) {
-		ch->ch_txcount += count;
-		head &= tmask;
-		writew(head, &(bs->tx_head));
-	}
-
-
-	dgap_set_firmware_event(un, UN_LOW | UN_EMPTY);
-
-	/*
-	 * If this is the print device, and the
-	 * printer is still on, we need to turn it
-	 * off before going idle.  If the buffer is
-	 * non-empty, wait until it goes empty.
-	 * Otherwise turn it off right now.
-	 */
-	if ((un->un_type == DGAP_PRINT) && (ch->ch_flags & CH_PRON)) {
-		tail = readw(&(bs->tx_tail)) & tmask;
-
-		if (tail != head) {
-			un->un_flags |= UN_EMPTY;
-			writeb(1, &(bs->iempty));
-		}
-		else {
-			dgap_wmove(ch, ch->ch_digi.digi_offstr,
-				(int) ch->ch_digi.digi_offlen);
-			head = readw(&(bs->tx_head)) & tmask;
-			ch->ch_flags &= ~CH_PRON;
-		}
-	}
-
-	/* Update printer buffer empty time. */
-	if ((un->un_type == DGAP_PRINT) && (ch->ch_digi.digi_maxcps > 0)
-	    && (ch->ch_digi.digi_bufsize > 0)) {
-                ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps;
-	}
-
-	if (from_user) {
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-		up(&dgap_TmpWriteSem);
-	}
-	else {
-		DGAP_UNLOCK(ch->ch_lock, lock_flags);
-	}
-
-	DPR_WRITE(("Write finished - Write %d bytes of %d.\n", count, orig_count));
-
-	return (count);
-}
-
-
-
-/*
- * Return modem signals to ld.
- */
-static int dgap_tty_tiocmget(struct tty_struct *tty)
-{
-	struct channel_t *ch;
-	struct un_t *un;
-	int result = -EIO;
-	uchar mstat = 0;
-	ulong lock_flags;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return result;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return result;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return result;
-
-	DPR_IOCTL(("dgap_tty_tiocmget start\n"));
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-
-	mstat = readb(&(ch->ch_bs->m_stat));
-        /* Append any outbound signals that might be pending... */
-        mstat |= ch->ch_mostat;
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	result = 0;
-
-	if (mstat & D_DTR(ch))
-		result |= TIOCM_DTR;
-	if (mstat & D_RTS(ch))
-		result |= TIOCM_RTS;
-	if (mstat & D_CTS(ch))
-		result |= TIOCM_CTS;
-	if (mstat & D_DSR(ch))
-		result |= TIOCM_DSR;
-	if (mstat & D_RI(ch))
-		result |= TIOCM_RI;
-	if (mstat & D_CD(ch))
-		result |= TIOCM_CD;
-
-	DPR_IOCTL(("dgap_tty_tiocmget finish\n"));
-
-	return result;
-}
-
-
-/*
- * dgap_tty_tiocmset()
- *
- * Set modem signals, called by ld.
- */
-
-static int dgap_tty_tiocmset(struct tty_struct *tty,
-                unsigned int set, unsigned int clear)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	int ret = -EIO;
-	ulong lock_flags;
-	ulong lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return ret;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return ret;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return ret;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return ret;
-
-	DPR_IOCTL(("dgap_tty_tiocmset start\n"));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	if (set & TIOCM_RTS) {
-		ch->ch_mforce |= D_RTS(ch);
-		ch->ch_mval   |= D_RTS(ch);
-        }
-
-	if (set & TIOCM_DTR) {
-		ch->ch_mforce |= D_DTR(ch);
-		ch->ch_mval   |= D_DTR(ch);
-        }
-
-	if (clear & TIOCM_RTS) {
-		ch->ch_mforce |= D_RTS(ch);
-		ch->ch_mval   &= ~(D_RTS(ch));
-        }
-
-	if (clear & TIOCM_DTR) {
-		ch->ch_mforce |= D_DTR(ch);
-		ch->ch_mval   &= ~(D_DTR(ch));
-        }
-
-	dgap_param(tty);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_tty_tiocmset finish\n"));
-
-	return (0);
-}
-
-
-
-/*
- * dgap_tty_send_break()
- *
- * Send a Break, called by ld.
- */
-static int dgap_tty_send_break(struct tty_struct *tty, int msec)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	int ret = -EIO;
-	ulong lock_flags;
-	ulong lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return ret;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return ret;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return ret;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return ret;
-
-	switch (msec) {
-	case -1:
-		msec = 0xFFFF;
-		break;
-	case 0:
-		msec = 1;
-		break;
-	default:
-		msec /= 10;
-		break;
-	}
-
-	DPR_IOCTL(("dgap_tty_send_break start 1.  %lx\n", jiffies));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-#if 0
-	dgap_cmdw(ch, SBREAK, (u16) SBREAK_TIME, 0);
-#endif
-	dgap_cmdw(ch, SBREAK, (u16) msec, 0);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_tty_send_break finish\n"));
-
-	return (0);
-}
-
-
-
-
-/*
- * dgap_tty_wait_until_sent()
- *
- * wait until data has been transmitted, called by ld.
- */
-static void dgap_tty_wait_until_sent(struct tty_struct *tty, int timeout)
-{
-	int rc;
-	rc = dgap_wait_for_drain(tty);
-	if (rc) {
-		DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
-		return;
-	}
-	return;
-}
-
-
-
-/*
- * dgap_send_xchar()
- *
- * send a high priority character, called by ld.
- */
-static void dgap_tty_send_xchar(struct tty_struct *tty, char c)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	ulong lock_flags;
-	ulong lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_IOCTL(("dgap_tty_send_xchar start 1.  %lx\n", jiffies));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	/*
-	 * This is technically what we should do.
-	 * However, the NIST tests specifically want
-	 * to see each XON or XOFF character that it
-	 * sends, so lets just send each character
-	 * by hand...
-	 */
-#if 0
-	if (c == STOP_CHAR(tty)) {
-		dgap_cmdw(ch, RPAUSE, 0, 0);
-	}
-	else if (c == START_CHAR(tty)) {
-		dgap_cmdw(ch, RRESUME, 0, 0);
-	}
-	else {
-		dgap_wmove(ch, &c, 1);
-	}
-#else
-	dgap_wmove(ch, &c, 1);
-#endif
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_tty_send_xchar finish\n"));
-
-	return;
-}
-
-
-
-
-/*
- * Return modem signals to ld.
- */
-static int dgap_get_modem_info(struct channel_t *ch, unsigned int __user *value)
-{
-	int result = 0;
-	uchar mstat = 0;
-	ulong lock_flags;
-	int rc = 0;
-
-	DPR_IOCTL(("dgap_get_modem_info start\n"));
-
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return(-ENXIO);
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-
-	mstat = readb(&(ch->ch_bs->m_stat));
-	/* Append any outbound signals that might be pending... */
-	mstat |= ch->ch_mostat;
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	result = 0;
-
-	if (mstat & D_DTR(ch))
-		result |= TIOCM_DTR;
-	if (mstat & D_RTS(ch))
-		result |= TIOCM_RTS;
-	if (mstat & D_CTS(ch))
-		result |= TIOCM_CTS;
-	if (mstat & D_DSR(ch))
-		result |= TIOCM_DSR;
-	if (mstat & D_RI(ch))
-		result |= TIOCM_RI;
-	if (mstat & D_CD(ch))
-		result |= TIOCM_CD;
-
-	rc = put_user(result, value);
-
-	DPR_IOCTL(("dgap_get_modem_info finish\n"));
-	return(rc);
-}
-
-
-/*
- * dgap_set_modem_info()
- *
- * Set modem signals, called by ld.
- */
-static int dgap_set_modem_info(struct tty_struct *tty, unsigned int command, unsigned int __user *value)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	int ret = -ENXIO;
-	unsigned int arg = 0;
-	ulong lock_flags;
-	ulong lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return ret;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return ret;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return ret;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return ret;
-
-	DPR_IOCTL(("dgap_set_modem_info() start\n"));
-
-	ret = get_user(arg, value);
-	if (ret) {
-		DPR_IOCTL(("dgap_set_modem_info %d ret: %x. finished.\n", __LINE__, ret));
-		return(ret);
-	}
-
-	DPR_IOCTL(("dgap_set_modem_info: command: %x arg: %x\n", command, arg));
-
-	switch (command) {
-	case TIOCMBIS:
-		if (arg & TIOCM_RTS) {
-			ch->ch_mforce |= D_RTS(ch);
-			ch->ch_mval   |= D_RTS(ch);
-        	}
-
-		if (arg & TIOCM_DTR) {
-			ch->ch_mforce |= D_DTR(ch);
-			ch->ch_mval   |= D_DTR(ch);
-        	}
-
-		break;
-
-	case TIOCMBIC:
-		if (arg & TIOCM_RTS) {
-			ch->ch_mforce |= D_RTS(ch);
-			ch->ch_mval   &= ~(D_RTS(ch));
-        	}
-
-		if (arg & TIOCM_DTR) {
-			ch->ch_mforce |= D_DTR(ch);
-			ch->ch_mval   &= ~(D_DTR(ch));
-        	}
-
-		break;
-
-        case TIOCMSET:
-		ch->ch_mforce = D_DTR(ch)|D_RTS(ch);
-
-		if (arg & TIOCM_RTS) {
-			ch->ch_mval |= D_RTS(ch);
-        	}
-		else {
-			ch->ch_mval &= ~(D_RTS(ch));
-		}
-
-		if (arg & TIOCM_DTR) {
-			ch->ch_mval |= (D_DTR(ch));
-        	}
-		else {
-			ch->ch_mval &= ~(D_DTR(ch));
-		}
-
-		break;
-
-	default:
-		return(-EINVAL);
-	}
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	dgap_param(tty);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_set_modem_info finish\n"));
-
-	return (0);
-}
-
-
-/*
- * dgap_tty_digigeta()
- *
- * Ioctl to get the information for ditty.
- *
- *
- *
- */
-static int dgap_tty_digigeta(struct tty_struct *tty, struct digi_t __user *retinfo)
-{
-	struct channel_t *ch;
-	struct un_t *un;
-	struct digi_t tmp;
-	ulong lock_flags;
-
-	if (!retinfo)
-		return (-EFAULT);
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return (-EFAULT);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (-EFAULT);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (-EFAULT);
-
-	memset(&tmp, 0, sizeof(tmp));
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-	memcpy(&tmp, &ch->ch_digi, sizeof(tmp));
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
-		return (-EFAULT);
-
-	return (0);
-}
-
-
-/*
- * dgap_tty_digiseta()
- *
- * Ioctl to set the information for ditty.
- *
- *
- *
- */
-static int dgap_tty_digiseta(struct tty_struct *tty, struct digi_t __user *new_info)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	struct digi_t new_digi;
-	ulong   lock_flags = 0;
-	unsigned long lock_flags2;
-
-	DPR_IOCTL(("DIGI_SETA start\n"));
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return (-EFAULT);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (-EFAULT);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (-EFAULT);
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return (-EFAULT);
-
-        if (copy_from_user(&new_digi, new_info, sizeof(struct digi_t))) {
-		DPR_IOCTL(("DIGI_SETA failed copy_from_user\n"));
-                return(-EFAULT);
-	}
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	memcpy(&ch->ch_digi, &new_digi, sizeof(struct digi_t));
-
-	if (ch->ch_digi.digi_maxcps < 1)
-		ch->ch_digi.digi_maxcps = 1;
-
-	if (ch->ch_digi.digi_maxcps > 10000)
-		ch->ch_digi.digi_maxcps = 10000;
-
-	if (ch->ch_digi.digi_bufsize < 10)
-		ch->ch_digi.digi_bufsize = 10;
-
-	if (ch->ch_digi.digi_maxchar < 1)
-		ch->ch_digi.digi_maxchar = 1;
-
-	if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize)
-		ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize;
-
-	if (ch->ch_digi.digi_onlen > DIGI_PLEN)
-		ch->ch_digi.digi_onlen = DIGI_PLEN;
-
-	if (ch->ch_digi.digi_offlen > DIGI_PLEN)
-		ch->ch_digi.digi_offlen = DIGI_PLEN;
-
-	dgap_param(tty);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("DIGI_SETA finish\n"));
-
-	return(0);
-}
-
-
-/*
- * dgap_tty_digigetedelay()
- *
- * Ioctl to get the current edelay setting.
- *
- *
- *
- */
-static int dgap_tty_digigetedelay(struct tty_struct *tty, int __user *retinfo)
-{
-	struct channel_t *ch;
-	struct un_t *un;
-	int tmp;
-	ulong lock_flags;
-
-	if (!retinfo)
-		return (-EFAULT);
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return (-EFAULT);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (-EFAULT);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (-EFAULT);
-
-	memset(&tmp, 0, sizeof(tmp));
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-	tmp = readw(&(ch->ch_bs->edelay));
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
-		return (-EFAULT);
-
-	return (0);
-}
-
-
-/*
- * dgap_tty_digisetedelay()
- *
- * Ioctl to set the EDELAY setting
- *
- */
-static int dgap_tty_digisetedelay(struct tty_struct *tty, int __user *new_info)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	int new_digi;
-	ulong lock_flags;
-	ulong lock_flags2;
-
-	DPR_IOCTL(("DIGI_SETA start\n"));
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return (-EFAULT);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (-EFAULT);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (-EFAULT);
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return (-EFAULT);
-
-        if (copy_from_user(&new_digi, new_info, sizeof(int))) {
-		DPR_IOCTL(("DIGI_SETEDELAY failed copy_from_user\n"));
-                return(-EFAULT);
-	}
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	writew((u16) new_digi, &(ch->ch_bs->edelay));
-
-	dgap_param(tty);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("DIGI_SETA finish\n"));
-
-	return(0);
-}
-
-
-/*
- * dgap_tty_digigetcustombaud()
- *
- * Ioctl to get the current custom baud rate setting.
- */
-static int dgap_tty_digigetcustombaud(struct tty_struct *tty, int __user *retinfo)
-{
-	struct channel_t *ch;
-	struct un_t *un;
-	int tmp;
-	ulong lock_flags;
-
-	if (!retinfo)
-		return (-EFAULT);
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return (-EFAULT);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (-EFAULT);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (-EFAULT);
-
-	memset(&tmp, 0, sizeof(tmp));
-
-	DGAP_LOCK(ch->ch_lock, lock_flags);
-	tmp = dgap_get_custom_baud(ch);
-	DGAP_UNLOCK(ch->ch_lock, lock_flags);
-
-	DPR_IOCTL(("DIGI_GETCUSTOMBAUD. Returning %d\n", tmp));
-
-	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
-		return (-EFAULT);
-
-	return (0);
-}
-
-
-/*
- * dgap_tty_digisetcustombaud()
- *
- * Ioctl to set the custom baud rate setting
- */
-static int dgap_tty_digisetcustombaud(struct tty_struct *tty, int __user *new_info)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	uint new_rate;
-	ulong lock_flags;
-	ulong lock_flags2;
-
-	DPR_IOCTL(("DIGI_SETCUSTOMBAUD start\n"));
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return (-EFAULT);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (-EFAULT);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (-EFAULT);
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return (-EFAULT);
-
-
-	if (copy_from_user(&new_rate, new_info, sizeof(unsigned int))) {
-		DPR_IOCTL(("DIGI_SETCUSTOMBAUD failed copy_from_user\n"));
-		return(-EFAULT);
-	}
-
-	if (bd->bd_flags & BD_FEP5PLUS) {
-
-		DPR_IOCTL(("DIGI_SETCUSTOMBAUD. Setting %d\n", new_rate));
-
-		DGAP_LOCK(bd->bd_lock, lock_flags);
-		DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-		ch->ch_custom_speed = new_rate;
-
-		dgap_param(tty);
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-	}
-
-	DPR_IOCTL(("DIGI_SETCUSTOMBAUD finish\n"));
-
-	return(0);
-}
-
-
-/*
- * dgap_set_termios()
- */
-static void dgap_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	unsigned long lock_flags;
-	unsigned long lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	ch->ch_c_cflag   = tty->termios.c_cflag;
-	ch->ch_c_iflag   = tty->termios.c_iflag;
-	ch->ch_c_oflag   = tty->termios.c_oflag;
-	ch->ch_c_lflag   = tty->termios.c_lflag;
-	ch->ch_startc    = tty->termios.c_cc[VSTART];
-	ch->ch_stopc     = tty->termios.c_cc[VSTOP];
-
-	dgap_carrier(ch);
-	dgap_param(tty);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-}
-
-
-static void dgap_tty_throttle(struct tty_struct *tty)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	ulong   lock_flags;
-	ulong   lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-        ch = un->un_ch;
-        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-                return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_IOCTL(("dgap_tty_throttle start\n"));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	ch->ch_flags |= (CH_RXBLOCK);
-#if 1
-	dgap_cmdw(ch, RPAUSE, 0, 0);
-#endif
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_tty_throttle finish\n"));
-}
-
-
-static void dgap_tty_unthrottle(struct tty_struct *tty)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	ulong   lock_flags;
-	ulong   lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-        ch = un->un_ch;
-        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-                return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_IOCTL(("dgap_tty_unthrottle start\n"));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	ch->ch_flags &= ~(CH_RXBLOCK);
-
-#if 1
-	dgap_cmdw(ch, RRESUME, 0, 0);
-#endif
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_tty_unthrottle finish\n"));
-}
-
-
-static void dgap_tty_start(struct tty_struct *tty)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	ulong   lock_flags;
-	ulong   lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-        ch = un->un_ch;
-        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-                return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_IOCTL(("dgap_tty_start start\n"));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	dgap_cmdw(ch, RESUMETX, 0, 0);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_tty_start finish\n"));
-}
-
-
-static void dgap_tty_stop(struct tty_struct *tty)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	ulong   lock_flags;
-	ulong   lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-        ch = un->un_ch;
-        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-                return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_IOCTL(("dgap_tty_stop start\n"));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	dgap_cmdw(ch, PAUSETX, 0, 0);
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_tty_stop finish\n"));
-}
-
-
-/*
- * dgap_tty_flush_chars()
- *
- * Flush the cook buffer
- *
- * Note to self, and any other poor souls who venture here:
- *
- * flush in this case DOES NOT mean dispose of the data.
- * instead, it means "stop buffering and send it if you
- * haven't already."  Just guess how I figured that out...   SRW 2-Jun-98
- *
- * It is also always called in interrupt context - JAR 8-Sept-99
- */
-static void dgap_tty_flush_chars(struct tty_struct *tty)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	ulong   lock_flags;
-	ulong   lock_flags2;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-        ch = un->un_ch;
-        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-                return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_IOCTL(("dgap_tty_flush_chars start\n"));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	/* TODO: Do something here */
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-	DPR_IOCTL(("dgap_tty_flush_chars finish\n"));
-}
-
-
-
-/*
- * dgap_tty_flush_buffer()
- *
- * Flush Tx buffer (make in == out)
- */
-static void dgap_tty_flush_buffer(struct tty_struct *tty)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	ulong   lock_flags;
-	ulong   lock_flags2;
-	u16	head = 0;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return;
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return;
-
-        ch = un->un_ch;
-        if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-                return;
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return;
-
-	DPR_IOCTL(("dgap_tty_flush_buffer on port: %d start\n", ch->ch_portnum));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	ch->ch_flags &= ~CH_STOP;
-	head = readw(&(ch->ch_bs->tx_head));
-	dgap_cmdw(ch, FLUSHTX, (u16) head, 0);
-	dgap_cmdw(ch, RESUMETX, 0, 0);
-	if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) {
-		ch->ch_tun.un_flags &= ~(UN_LOW|UN_EMPTY);
-		wake_up_interruptible(&ch->ch_tun.un_flags_wait);
-	}
-	if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) {
-		ch->ch_pun.un_flags &= ~(UN_LOW|UN_EMPTY);
-		wake_up_interruptible(&ch->ch_pun.un_flags_wait);
-	}
-
-	DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-	DGAP_UNLOCK(bd->bd_lock, lock_flags);
-	if (waitqueue_active(&tty->write_wait))
-		wake_up_interruptible(&tty->write_wait);
-	tty_wakeup(tty);
-
-	DPR_IOCTL(("dgap_tty_flush_buffer finish\n"));
-}
-
-
-
-/*****************************************************************************
- *
- * The IOCTL function and all of its helpers
- *
- *****************************************************************************/
-
-/*
- * dgap_tty_ioctl()
- *
- * The usual assortment of ioctl's
- */
-static int dgap_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
-		unsigned long arg)
-{
-	struct board_t *bd;
-	struct channel_t *ch;
-	struct un_t *un;
-	int rc;
-	u16	head = 0;
-	ulong   lock_flags = 0;
-	ulong   lock_flags2 = 0;
-	void __user *uarg = (void __user *) arg;
-
-	if (!tty || tty->magic != TTY_MAGIC)
-		return (-ENODEV);
-
-	un = tty->driver_data;
-	if (!un || un->magic != DGAP_UNIT_MAGIC)
-		return (-ENODEV);
-
-	ch = un->un_ch;
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return (-ENODEV);
-
-	bd = ch->ch_bd;
-	if (!bd || bd->magic != DGAP_BOARD_MAGIC)
-		return (-ENODEV);
-
-	DPR_IOCTL(("dgap_tty_ioctl start on port %d - cmd %s (%x), arg %lx\n",
-		ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
-
-	DGAP_LOCK(bd->bd_lock, lock_flags);
-	DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-	if (un->un_open_count <= 0) {
-		DPR_BASIC(("dgap_tty_ioctl - unit not open.\n"));
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return(-EIO);
-	}
-
-	switch (cmd) {
-
-	/* Here are all the standard ioctl's that we MUST implement */
-
-	case TCSBRK:
-		/*
-		 * TCSBRK is SVID version: non-zero arg --> no break
-		 * this behaviour is exploited by tcdrain().
-		 *
-		 * According to POSIX.1 spec (7.2.2.1.2) breaks should be
-		 * between 0.25 and 0.5 seconds so we'll ask for something
-		 * in the middle: 0.375 seconds.
-		 */
-		rc = tty_check_change(tty);
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		if (rc) {
-			return(rc);
-		}
-
-		rc = dgap_wait_for_drain(tty);
-
-		if (rc) {
-			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
-			return(-EINTR);
-		}
-
-		DGAP_LOCK(bd->bd_lock, lock_flags);
-		DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-		if(((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP)) {
-			dgap_cmdw(ch, SBREAK, (u16) SBREAK_TIME, 0);
-		}
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-		DPR_IOCTL(("dgap_tty_ioctl finish on port %d - cmd %s (%x), arg %lx\n",
-			ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
-
-                return(0);
-
-
-	case TCSBRKP:
- 		/* support for POSIX tcsendbreak()
-
-		 * According to POSIX.1 spec (7.2.2.1.2) breaks should be
-		 * between 0.25 and 0.5 seconds so we'll ask for something
-		 * in the middle: 0.375 seconds.
-		 */
-		rc = tty_check_change(tty);
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		if (rc) {
-			return(rc);
-		}
-
-		rc = dgap_wait_for_drain(tty);
-		if (rc) {
-			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
-			return(-EINTR);
-		}
-
-		DGAP_LOCK(bd->bd_lock, lock_flags);
-		DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-		dgap_cmdw(ch, SBREAK, (u16) SBREAK_TIME, 0);
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-		DPR_IOCTL(("dgap_tty_ioctl finish on port %d - cmd %s (%x), arg %lx\n",
-			ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
-
-		return(0);
-
-        case TIOCSBRK:
-		/*
-		 * FEP5 doesn't support turning on a break unconditionally.
-		 * The FEP5 device will stop sending a break automatically
-		 * after the specified time value that was sent when turning on
-		 * the break.
-		 */
-		rc = tty_check_change(tty);
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		if (rc) {
-			return(rc);
-		}
-
-		rc = dgap_wait_for_drain(tty);
-		if (rc) {
-			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
-			return(-EINTR);
-		}
-
-		DGAP_LOCK(bd->bd_lock, lock_flags);
-		DGAP_LOCK(ch->ch_lock, lock_flags2);
-
-		dgap_cmdw(ch, SBREAK, (u16) SBREAK_TIME, 0);
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-		DPR_IOCTL(("dgap_tty_ioctl finish on port %d - cmd %s (%x), arg %lx\n",
-			ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
-
-		return 0;
-
-        case TIOCCBRK:
-		/*
-		 * FEP5 doesn't support turning off a break unconditionally.
-		 * The FEP5 device will stop sending a break automatically
-		 * after the specified time value that was sent when turning on
-		 * the break.
-		 */
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return 0;
-
-	case TIOCGSOFTCAR:
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-		rc = put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) arg);
-		return(rc);
-
-	case TIOCSSOFTCAR:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-		rc = get_user(arg, (unsigned long __user *) arg);
-		if (rc)
-			return(rc);
-
-		DGAP_LOCK(bd->bd_lock, lock_flags);
-		DGAP_LOCK(ch->ch_lock, lock_flags2);
-		tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
-		dgap_param(tty);
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-		return(0);
-
-	case TIOCMGET:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-                return(dgap_get_modem_info(ch, uarg));
-
-	case TIOCMBIS:
-	case TIOCMBIC:
-	case TIOCMSET:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return(dgap_set_modem_info(tty, cmd, uarg));
-
-		/*
-		 * Here are any additional ioctl's that we want to implement
-		 */
-
-	case TCFLSH:
-		/*
-		 * The linux tty driver doesn't have a flush
-		 * input routine for the driver, assuming all backed
-		 * up data is in the line disc. buffers.  However,
-		 * we all know that's not the case.  Here, we
-		 * act on the ioctl, but then lie and say we didn't
-		 * so the line discipline will process the flush
-		 * also.
-		 */
-		rc = tty_check_change(tty);
-		if (rc) {
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			return(rc);
-		}
-
-		if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) {
-			if (!(un->un_type == DGAP_PRINT)) {
-				head = readw(&(ch->ch_bs->rx_head));
-				writew(head, &(ch->ch_bs->rx_tail));
-				writeb(0, &(ch->ch_bs->orun));
-			}
-		}
-
-		if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) {
-			ch->ch_flags &= ~CH_STOP;
-			head = readw(&(ch->ch_bs->tx_head));
-			dgap_cmdw(ch, FLUSHTX, (u16) head, 0 );
-			dgap_cmdw(ch, RESUMETX, 0, 0);
-			if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) {
-				ch->ch_tun.un_flags &= ~(UN_LOW|UN_EMPTY);
-				wake_up_interruptible(&ch->ch_tun.un_flags_wait);
-			}
-			if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) {
-				ch->ch_pun.un_flags &= ~(UN_LOW|UN_EMPTY);
-				wake_up_interruptible(&ch->ch_pun.un_flags_wait);
-			}
-			if (waitqueue_active(&tty->write_wait))
-				wake_up_interruptible(&tty->write_wait);
-
-			/* Can't hold any locks when calling tty_wakeup! */
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			tty_wakeup(tty);
-			DGAP_LOCK(bd->bd_lock, lock_flags);
-			DGAP_LOCK(ch->ch_lock, lock_flags2);
-		}
-
-		/* pretend we didn't recognize this IOCTL */
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-		DPR_IOCTL(("dgap_tty_ioctl (LINE:%d) finish on port %d - cmd %s (%x), arg %lx\n",
-			__LINE__, ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
-
-		return(-ENOIOCTLCMD);
-
-	case TCSETSF:
-	case TCSETSW:
-		/*
-		 * The linux tty driver doesn't have a flush
-		 * input routine for the driver, assuming all backed
-		 * up data is in the line disc. buffers.  However,
-		 * we all know that's not the case.  Here, we
-		 * act on the ioctl, but then lie and say we didn't
-		 * so the line discipline will process the flush
-		 * also.
-		 */
-		if (cmd == TCSETSF) {
-			/* flush rx */
-			ch->ch_flags &= ~CH_STOP;
-			head = readw(&(ch->ch_bs->rx_head));
-			writew(head, &(ch->ch_bs->rx_tail));
-		}
-
-		/* now wait for all the output to drain */
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		rc = dgap_wait_for_drain(tty);
-		if (rc) {
-			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
-			return(-EINTR);
-		}
-
-		DPR_IOCTL(("dgap_tty_ioctl finish on port %d - cmd %s (%x), arg %lx\n",
-			ch->ch_portnum, dgap_ioctl_name(cmd), cmd, arg));
-
-		/* pretend we didn't recognize this */
-		return(-ENOIOCTLCMD);
-
-	case TCSETAW:
-
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		rc = dgap_wait_for_drain(tty);
-		if (rc) {
-			DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
-			return(-EINTR);
-		}
-
-		/* pretend we didn't recognize this */
-		return(-ENOIOCTLCMD);
-
-	case TCXONC:
-		/*
-		 * The Linux Line Discipline (LD) would do this for us if we
-		 * let it, but we have the special firmware options to do this
-		 * the "right way" regardless of hardware or software flow
-		 * control so we'll do it outselves instead of letting the LD
-		 * do it.
-		 */
-		rc = tty_check_change(tty);
-		if (rc) {
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			return(rc);
-		}
-
-		DPR_IOCTL(("dgap_ioctl - in TCXONC - %d\n", cmd));
-		switch (arg) {
-
-		case TCOON:
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			dgap_tty_start(tty);
-			return(0);
-		case TCOOFF:
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			dgap_tty_stop(tty);
-			return(0);
-		case TCION:
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			/* Make the ld do it */
-			return(-ENOIOCTLCMD);
-		case TCIOFF:
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			/* Make the ld do it */
-			return(-ENOIOCTLCMD);
-		default:
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			return(-EINVAL);
-		}
-
-	case DIGI_GETA:
-		/* get information for ditty */
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return(dgap_tty_digigeta(tty, uarg));
-
-	case DIGI_SETAW:
-	case DIGI_SETAF:
-
-		/* set information for ditty */
-		if (cmd == (DIGI_SETAW)) {
-
-			DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-			DGAP_UNLOCK(bd->bd_lock, lock_flags);
-			rc = dgap_wait_for_drain(tty);
-			if (rc) {
-				DPR_IOCTL(("dgap_tty_ioctl - bad return: %d ", rc));
-				return(-EINTR);
-			}
-			DGAP_LOCK(bd->bd_lock, lock_flags);
-			DGAP_LOCK(ch->ch_lock, lock_flags2);
-		}
-		else {
-			tty_ldisc_flush(tty);
-		}
-		/* fall thru */
-
-	case DIGI_SETA:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return(dgap_tty_digiseta(tty, uarg));
-
-	case DIGI_GEDELAY:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return(dgap_tty_digigetedelay(tty, uarg));
-
-	case DIGI_SEDELAY:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return(dgap_tty_digisetedelay(tty, uarg));
-
-	case DIGI_GETCUSTOMBAUD:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return(dgap_tty_digigetcustombaud(tty, uarg));
-
-	case DIGI_SETCUSTOMBAUD:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return(dgap_tty_digisetcustombaud(tty, uarg));
-
-	case DIGI_RESET_PORT:
-		dgap_firmware_reset_port(ch);
-		dgap_param(tty);
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-		return 0;
-
-	default:
-		DGAP_UNLOCK(ch->ch_lock, lock_flags2);
-		DGAP_UNLOCK(bd->bd_lock, lock_flags);
-
-		DPR_IOCTL(("dgap_tty_ioctl - in default\n"));
-		DPR_IOCTL(("dgap_tty_ioctl end - cmd %s (%x), arg %lx\n",
-			dgap_ioctl_name(cmd), cmd, arg));
-
-		return(-ENOIOCTLCMD);
-	}
-}
-- 
1.8.1.4

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