Updated cx driver commit part 1: bring in the new kernel driver.

This is the vastly updated cx drvier from Roman Kurakin <rik@cronyx.ru>
who has been patiently waiting for this update for sometime.

The driver is mostly a rewrite from the version we have in the tree.
While some similarities remain, losing the little history that the old
driver has is not a big loss, and the re@ felt it was easier this way (less
error prone).

The userland parts of this update will be committed shortly.

The driver is not connected to the build yet.  I want to make sure I
don't break any platform at any time, so I want to test that with
these files in the tree before I continue (on the off chance I'm
forgetting a file).

I changed the DEBUG macro to CX_DEBUG from the code that was submitted
(to not break when we go to building with opt_global.h after the
release), as well adding $FreeBSD$.

Submitted by: Roman Kurakin
Approved by: re@ <scottl>

1 files changed, 3240 insertions, 0 deletions

diff --git a/sys/dev/cx/if_cx.c b/sys/dev/cx/if_cx.c
new file mode 100644
index 0000000..db7e283
--- /dev/null
+++ b/sys/dev/cx/if_cx.c
@@ -0,0 +1,3240 @@
+/*
+ * Cronyx-Sigma adapter driver for FreeBSD.
+ * Supports PPP/HDLC and Cisco/HDLC protocol in synchronous mode,
+ * and asyncronous channels with full modem control.
+ * Keepalive protocol implemented in both Cisco and PPP modes.
+ *
+ * Copyright (C) 1994-2002 Cronyx Engineering.
+ * Author: Serge Vakulenko, <vak@cronyx.ru>
+ *
+ * Copyright (C) 1999-2003 Cronyx Engineering.
+ * Rewritten on DDK, ported to NETGRAPH, rewritten for FreeBSD 3.x-5.x by
+ * Kurakin Roman, <rik@cronyx.ru>
+ *
+ * This software is distributed with NO WARRANTIES, not even the implied
+ * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Authors grant any other persons or organisations a permission to use,
+ * modify and redistribute this software in source and binary forms,
+ * as long as this message is kept with the software, all derivative
+ * works or modified versions.
+ *
+ * Cronyx Id: if_cx.c,v 1.1.2.18 2003/11/27 14:30:03 rik Exp $
+ */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+
+#if __FreeBSD_version >= 500000
+#   define NCX 1
+#else
+#   include "cx.h"
+#endif
+
+#if NCX > 0
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/mbuf.h>
+#include <sys/sockio.h>
+#include <sys/malloc.h>
+#include <sys/socket.h>
+#include <sys/conf.h>
+#include <sys/errno.h>
+#include <sys/tty.h>
+#if __FreeBSD_version >= 400000
+#   include <sys/bus.h>
+#   include <machine/bus.h>
+#   include <sys/rman.h>
+#   include <isa/isavar.h>
+#endif
+#include <sys/fcntl.h>
+#include <sys/interrupt.h>
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <net/if.h>
+#include <machine/cpufunc.h>
+#include <machine/cserial.h>
+#include <machine/clock.h>
+#if __FreeBSD_version < 500000
+#include <machine/ipl.h>
+#include <i386/isa/isa_device.h>
+#endif
+#if __FreeBSD_version >= 400000
+#   include <machine/resource.h>
+#if __FreeBSD_version <= 501000
+#       include <i386/isa/intr_machdep.h>
+#   endif
+#endif
+#if __FreeBSD_version >= 500000
+#   include <dev/cx/machdep.h>
+#   include <dev/cx/cxddk.h>
+#   include <dev/cx/cronyxfw.h>
+#else
+#   include <i386/isa/cronyx/machdep.h>
+#   include <i386/isa/cronyx/cxddk.h>
+#   include <i386/isa/cronyx/cronyxfw.h>
+#endif
+#include "opt_ng_cronyx.h"
+#ifdef NETGRAPH_CRONYX
+#   include "opt_netgraph.h"
+#   include <netgraph/ng_message.h>
+#   include <netgraph/netgraph.h>
+#   if __FreeBSD_version >= 500000
+#       include <dev/cx/ng_cx.h>
+#   else
+#       include <netgraph/ng_cx.h>
+#   endif
+#else
+#   include <net/if_types.h>
+#   if __FreeBSD_version < 500000
+#   include "sppp.h"
+#   if NSPPP <= 0
+#	error The device cp requires sppp or netgraph.
+#   endif
+#   endif
+#   include <net/if_sppp.h>
+#   define PP_CISCO IFF_LINK2
+#if __FreeBSD_version < 400000
+#   include <bpfilter.h>
+#   if NBPFILTER > 0
+#      include <net/bpf.h>
+#   endif
+#else
+#   if __FreeBSD_version < 500000
+#       include <bpf.h>
+#   endif
+#   include <net/bpf.h>
+#   define NBPFILTER NBPF
+#endif
+#endif
+
+#define CX_DEBUG(d,s)	({if (d->chan->debug) {\
+				printf ("%s: ", d->name); printf s;}})
+#define CX_DEBUG2(d,s)	({if (d->chan->debug>1) {\
+				printf ("%s: ", d->name); printf s;}})
+
+#define UNIT(d)         (minor(d) & 0x3f)
+#define IF_CUNIT(d)     (minor(d) & 0x40)
+#define UNIT_CTL        0x3f
+#define CALLOUT(d)      (minor(d) & 0x80)
+#define CDEV_MAJOR	42
+
+typedef struct _async_q {
+	int beg;
+	int end;
+	#define BF_SZ 14400
+	int buf[BF_SZ+1];
+} async_q;
+
+#define AQ_GSZ(q)	((BF_SZ + (q)->end - (q)->beg)%BF_SZ)
+#define AQ_PUSH(q,c)	{*((q)->buf + (q)->end) = c;\
+			(q)->end = ((q)->end + 1)%BF_SZ;}
+#define AQ_POP(q,c)	{c = *((q)->buf + (q)->beg);\
+			(q)->beg = ((q)->beg + 1)%BF_SZ;}
+
+#if __FreeBSD_version >= 400000
+static void cx_identify		__P((driver_t *, device_t));
+static int cx_probe		__P((device_t));
+static int cx_attach		__P((device_t));
+static int cx_detach		__P((device_t));
+
+static device_method_t cx_isa_methods [] = {
+	DEVMETHOD(device_identify,	cx_identify),
+	DEVMETHOD(device_probe,		cx_probe),
+	DEVMETHOD(device_attach,	cx_attach),
+	DEVMETHOD(device_detach,	cx_detach),
+	{0, 0}
+};
+
+typedef struct _bdrv_t {
+	cx_board_t	*board;
+	struct resource	*base_res;
+	struct resource	*drq_res;
+	struct resource	*irq_res;
+	int		base_rid;
+	int		drq_rid;
+	int		irq_rid;
+	void		*intrhand;
+} bdrv_t;
+
+static driver_t cx_isa_driver = {
+	"cx",
+	cx_isa_methods,
+	sizeof (bdrv_t),
+};
+
+static devclass_t cx_devclass;
+#endif
+
+typedef struct _drv_t {
+	char name [8];
+	cx_chan_t *chan;
+	cx_board_t *board;
+	cx_buf_t buf;
+	struct tty tty;
+	struct callout_handle dcd_timeout_handle;
+	unsigned dtrwait;
+	unsigned dtroff;
+	unsigned callout;
+	unsigned lock;
+	int open_dev;
+	int cd;
+	int running;
+	struct	callout_handle dtr_timeout_handle;
+#ifdef NETGRAPH
+	char	nodename [NG_NODELEN+1];
+	hook_p	hook;
+	hook_p	debug_hook;
+	node_p	node;
+	struct	ifqueue lo_queue;
+	struct	ifqueue hi_queue;
+	short	timeout;
+	struct	callout_handle timeout_handle;
+#else
+	struct sppp pp;
+#endif
+#if __FreeBSD_version >= 400000
+	dev_t  devt[3];
+#endif
+	async_q aqueue;
+	#define CX_READ 1
+	#define CX_WRITE 2
+	int intr_action;
+	short atimeout;
+} drv_t;
+
+extern long csigma_fw_len;
+extern const char *csigma_fw_version;
+extern const char *csigma_fw_date;
+extern const char *csigma_fw_copyright;
+extern const cr_dat_tst_t csigma_fw_tvec[];
+extern const u_char csigma_fw_data[];
+static void cx_oproc (struct tty *tp);
+static int cx_param (struct tty *tp, struct termios *t);
+static void cx_stop (struct tty *tp, int flag);
+static void cx_dtrwakeup (void *a);
+static void cx_receive (cx_chan_t *c, char *data, int len);
+static void cx_transmit (cx_chan_t *c, void *attachment, int len);
+static void cx_error (cx_chan_t *c, int data);
+static void cx_modem (cx_chan_t *c);
+static void cx_up (drv_t *d);
+static void cx_start (drv_t *d);
+static void disc_optim(struct tty *tp, struct termios *t);
+#if __FreeBSD_version < 500000
+static swihand_t cx_softintr;
+#else
+static void cx_softintr (void *);
+static void *cx_slow_ih;
+static void *cx_fast_ih;
+#endif
+static void cx_down (drv_t *d);
+static void cx_watchdog (drv_t *d);
+static void cx_carrier (void *arg);
+
+#ifdef NETGRAPH
+extern struct ng_type typestruct;
+#else
+static void cx_ifstart (struct ifnet *ifp);
+static void cx_tlf (struct sppp *sp);
+static void cx_tls (struct sppp *sp);
+static void cx_ifwatchdog (struct ifnet *ifp);
+static int cx_sioctl (struct ifnet *ifp, u_long cmd, caddr_t data);
+static void cx_initialize (void *softc);
+#endif
+
+static cx_board_t *adapter [NCX];
+static drv_t *channel [NCX*NCHAN];
+static struct callout_handle led_timo [NCX];
+static struct callout_handle timeout_handle;
+#if __FreeBSD_version >= 400000
+	extern struct cdevsw cx_cdevsw;
+#endif
+
+static int MY_SOFT_INTR;
+
+/*
+ * Print the mbuf chain, for debug purposes only.
+ */
+static void printmbuf (struct mbuf *m)
+{
+	printf ("mbuf:");
+	for (; m; m=m->m_next) {
+		if (m->m_flags & M_PKTHDR)
+			printf (" HDR %d:", m->m_pkthdr.len);
+		if (m->m_flags & M_EXT)
+			printf (" EXT:");
+		printf (" %d", m->m_len);
+	}
+	printf ("\n");
+}
+
+/*
+ * Make an mbuf from data.
+ */
+static struct mbuf *makembuf (void *buf, u_int len)
+{
+	struct mbuf *m, *o, *p;
+
+	MGETHDR (m, M_DONTWAIT, MT_DATA);
+
+	if (! m)
+		return 0;
+
+	if (len >= MINCLSIZE)
+		MCLGET (m, M_DONTWAIT);
+
+	m->m_pkthdr.len = len;
+	m->m_len = 0;
+
+	p = m;
+	while (len) {
+		u_int n = M_TRAILINGSPACE (p);
+		if (n > len)
+			n = len;
+		if (! n) {
+			/* Allocate new mbuf. */
+			o = p;
+			MGET (p, M_DONTWAIT, MT_DATA);
+			if (! p) {
+				m_freem (m);
+				return 0;
+			}
+			if (len >= MINCLSIZE)
+				MCLGET (p, M_DONTWAIT);
+			p->m_len = 0;
+			o->m_next = p;
+
+			n = M_TRAILINGSPACE (p);
+			if (n > len)
+				n = len;
+		}
+		bcopy (buf, mtod (p, caddr_t) + p->m_len, n);
+
+		p->m_len += n;
+		buf = n + (char*) buf;
+		len -= n;
+	}
+	return m;
+}
+
+/*
+ * Recover after lost transmit interrupts.
+ */
+static void cx_timeout (void *arg)
+{
+	drv_t *d;
+	int s, i;
+
+	for (i=0; i<NCX*NCHAN; ++i) {
+		d = channel[i];
+		if (! d)
+			continue;
+		s = splhigh ();
+		if (d->atimeout == 1 && d->tty.t_state & TS_BUSY) {
+			d->tty.t_state &= ~TS_BUSY;
+			if (d->tty.t_dev) {
+				d->intr_action |= CX_WRITE;
+				MY_SOFT_INTR = 1;
+#if __FreeBSD_version >= 500000
+				swi_sched (cx_fast_ih, 0);
+#else
+				setsofttty ();
+#endif
+			}
+			CX_DEBUG (d, ("cx_timeout\n"));
+		}
+		if (d->atimeout)
+			d->atimeout--;
+		splx (s);
+	}
+	timeout_handle = timeout (cx_timeout, 0, hz*5);
+}
+
+static void cx_led_off (void *arg)
+{
+	cx_board_t *b = arg;
+	int s = splhigh ();
+
+	cx_led (b, 0);
+	led_timo[b->num].callout = 0;
+	splx (s);
+}
+
+/*
+ * Activate interupt handler from DDK.
+ */
+#if __FreeBSD_version >= 400000
+static void cx_intr (void *arg)
+{
+	bdrv_t *bd = arg;
+	cx_board_t *b = bd->board;
+#else
+static void cx_intr (int bnum)
+{
+	cx_board_t *b = adapter [bnum];
+#endif
+	int s = splhigh ();
+
+	/* Turn LED on. */
+	cx_led (b, 1);
+
+	cx_int_handler (b);
+
+	/* Turn LED off 50 msec later. */
+	if (! led_timo[b->num].callout)
+		led_timo[b->num] = timeout (cx_led_off, b, hz/20);
+	splx (s);
+}
+
+static int probe_irq (cx_board_t *b, int irq)
+{
+	int mask, busy, cnt;
+
+	/* Clear pending irq, if any. */
+	cx_probe_irq (b, -irq);
+	DELAY (100);
+	for (cnt=0; cnt<5; ++cnt) {
+		/* Get the mask of pending irqs, assuming they are busy.
+		 * Activate the adapter on given irq. */
+		busy = cx_probe_irq (b, irq);
+		DELAY (100);
+
+		/* Get the mask of active irqs.
+		 * Deactivate our irq. */
+		mask = cx_probe_irq (b, -irq);
+		DELAY (100);
+		if ((mask & ~busy) == 1 << irq) {
+			cx_probe_irq (b, 0);
+			/* printf ("cx%d: irq %d ok, mask=0x%04x, busy=0x%04x\n",
+				b->num, irq, mask, busy); */
+			return 1;
+		}
+	}
+	/* printf ("cx%d: irq %d not functional, mask=0x%04x, busy=0x%04x\n",
+		b->num, irq, mask, busy); */
+	cx_probe_irq (b, 0);
+	return 0;
+}
+
+static short porttab [] = {
+	0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0,
+	0x300, 0x320, 0x340, 0x360, 0x380, 0x3a0, 0x3c0, 0x3e0, 0
+};
+static char dmatab [] = { 7, 6, 5, 0 };
+static char irqtab [] = { 5, 10, 11, 7, 3, 15, 12, 0 };
+
+#if __FreeBSD_version >= 400000
+static int cx_is_free_res (device_t dev, int rid, int type, u_long start,
+	u_long end, u_long count)
+{
+	struct resource *res;
+	
+	if (!(res = bus_alloc_resource (dev, type, &rid, start, end, count,
+	    RF_ALLOCATED)))
+		return 0;
+		
+	bus_release_resource (dev, type, rid, res);
+	
+	return 1;
+}
+
+static void cx_identify (driver_t *driver, device_t dev)
+{
+	u_long iobase, rescount;
+	int devcount;
+	device_t *devices;
+	device_t child;
+	devclass_t my_devclass;
+	int i, k;
+
+	if ((my_devclass = devclass_find ("cx")) == NULL)
+		return;
+
+	devclass_get_devices (my_devclass, &devices, &devcount);
+
+	if (devcount == 0) {
+		/* We should find all devices by our self. We could alter other
+		 * devices, but we don't have a choise
+		 */
+		for (i = 0; (iobase = porttab [i]) != 0; i++) {
+			if (!cx_is_free_res (dev, 1, SYS_RES_IOPORT,
+			    iobase, iobase + NPORT, NPORT))
+				continue;
+			if (cx_probe_board (iobase, -1, -1) == 0)
+				continue;
+			
+			devcount++;
+
+			child = BUS_ADD_CHILD (dev, ISA_ORDER_SPECULATIVE, "cx",
+			    -1);
+
+			if (child == NULL)
+				return;
+
+			device_set_desc_copy (child, "Cronyx Sigma");
+			device_set_driver (child, driver);
+			bus_set_resource (child, SYS_RES_IOPORT, 0,
+			    iobase, NPORT);
+
+			if (devcount >= NCX)
+				break;
+		}
+	} else {
+		static short porttab [] = {
+			0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0,
+			0x300, 0x320, 0x340, 0x360, 0x380, 0x3a0, 0x3c0, 0x3e0, 0
+		};
+		/* Lets check user choise.
+		 */
+		for (k = 0; k < devcount; k++) {
+			if (bus_get_resource (devices[k], SYS_RES_IOPORT, 0,
+			    &iobase, &rescount) != 0)
+				continue;
+
+			for (i = 0; porttab [i] != 0; i++) {
+				if (porttab [i] != iobase)
+					continue;
+				if (!cx_is_free_res (devices[k], 1, SYS_RES_IOPORT,
+				    iobase, iobase + NPORT, NPORT))
+					continue;
+				if (cx_probe_board (iobase, -1, -1) == 0)
+					continue;
+				porttab [i] = -1;
+				device_set_desc_copy (devices[k], "Cronyx Sigma");
+				break;
+			}
+
+			if (porttab [i] == 0) {
+				device_delete_child (
+				    device_get_parent (devices[k]),
+				    devices [k]);
+				devices[k] = 0;
+				continue;
+			}
+		}
+		for (k = 0; k < devcount; k++) {
+			if (devices[k] == 0)
+				continue;
+			if (bus_get_resource (devices[k], SYS_RES_IOPORT, 0,
+			    &iobase, &rescount) == 0)
+				continue;
+			for (i = 0; (iobase = porttab [i]) != 0; i++) {
+				if (porttab [i] == -1) {
+					continue;
+				}
+				if (!cx_is_free_res (devices[k], 1, SYS_RES_IOPORT,
+				    iobase, iobase + NPORT, NPORT))
+					continue;
+				if (cx_probe_board (iobase, -1, -1) == 0)
+					continue;
+			
+				bus_set_resource (devices[k], SYS_RES_IOPORT, 0,
+				    iobase, NPORT);
+				porttab [i] = -1;
+				device_set_desc_copy (devices[k], "Cronyx Sigma");
+				break;
+			}
+			if (porttab [i] == 0) {
+				device_delete_child (
+				    device_get_parent (devices[k]),
+				    devices [k]);
+			}
+		}		
+		free (devices, M_TEMP);
+	}
+	
+	return;
+}
+
+static int cx_probe (device_t dev)
+{
+	int unit = device_get_unit (dev);
+	int i;
+	u_long iobase, rescount;
+
+	if (!device_get_desc (dev) ||
+	    strcmp (device_get_desc (dev), "Cronyx Sigma"))
+		return ENXIO;
+	
+	if (bus_get_resource (dev, SYS_RES_IOPORT, 0, &iobase, &rescount) != 0) {
+		printf ("cx%d: Couldn't get IOPORT\n", unit);
+		return ENXIO;
+	}
+
+	if (!cx_is_free_res (dev, 1, SYS_RES_IOPORT,
+	    iobase, iobase + NPORT, NPORT)) {
+		printf ("cx%d: Resource IOPORT isn't free %lx\n", unit, iobase);
+		return ENXIO;
+	}
+		
+	for (i = 0; porttab [i] != 0; i++) {
+		if (porttab [i] == iobase) {
+			porttab [i] = -1;
+			break;
+		}
+	}
+	
+	if (porttab [i] == 0) {
+		return ENXIO;
+	}
+	
+	if (!cx_probe_board (iobase, -1, -1)) {
+		printf ("cx%d: probing for Sigma at %lx faild\n", unit, iobase);
+		return ENXIO;
+	}
+	
+	return 0;
+}
+#else /* __FreeBSD_version < 400000 */
+static int cx_probe (struct isa_device *id)
+{
+	cx_board_t *b;
+	int i;
+
+#ifndef NETGRAPH
+	if (! sppp_attach) {
+		printf ("cx%d: no synchronous PPP driver configured\n",
+			id->id_unit);
+		return 0;
+	}
+#endif
+	if (id->id_iobase < 0) {
+		/* Autodetect the adapter. */
+		for (i=0; ; i++) {
+			if (! porttab[i]) {
+				id->id_iobase = -1;
+				return 0;
+			}
+			id->id_iobase = porttab[i];
+			if (id->id_unit > 0 && adapter[0] && adapter[0]->port == id->id_iobase)
+				continue;
+			if (id->id_unit > 1 && adapter[1] && adapter[1]->port == id->id_iobase)
+				continue;
+			if (! haveseen_isadev (id, CC_IOADDR | CC_QUIET) &&
+ 			    cx_probe_board (id->id_iobase, -1, -1))
+ 				break;
+		}
+	} else if (! cx_probe_board (id->id_iobase, -1, -1))
+		return 0;
+
+	if (id->id_drq < 0) {
+		/* Find available 16-bit DRQ. */
+
+		for (i=0; ; ++i) {
+			if (! dmatab[i]) {
+				printf ("cx%d: no available drq found\n",
+					id->id_unit);
+				id->id_drq = -1;
+				return 0;
+			}
+			id->id_drq = dmatab[i];
+			if (! haveseen_isadev (id, CC_DRQ | CC_QUIET)
+			    && !isa_dma_acquire (id->id_drq))
+ 				break;
+		}
+	}
+
+	b = malloc (sizeof (cx_board_t), M_DEVBUF, M_WAITOK);
+	if (!b) {
+		printf ("cx:%d: Couldn't allocate memory\n", id->id_unit);
+		return (ENXIO);
+	}
+	adapter[id->id_unit] = b;
+	bzero (b, sizeof(cx_board_t));
+
+	if (! cx_open_board (b, id->id_unit, id->id_iobase,
+	    id->id_irq ? ffs (id->id_irq) - 1 : -1, id->id_drq)) {
+		printf ("cx%d: cannot initialize adapter\n", id->id_unit);
+		isa_dma_release (id->id_drq);
+		adapter[id->id_unit] = 0;
+		free (b, M_DEVBUF);
+		return 0;
+	}
+
+	if (id->id_irq) {
+		if (! probe_irq (b, ffs (id->id_irq) - 1))
+			printf ("cx%d: irq %d not functional\n",
+				id->id_unit, ffs (id->id_irq) - 1);
+	} else {
+		/* Find available IRQ. */
+
+		for (i=0; ; ++i) {
+			if (! irqtab[i]) {
+				printf ("cx%d: no available irq found\n",
+					id->id_unit);
+				id->id_irq = -1;
+				isa_dma_release (id->id_drq);
+				adapter[id->id_unit] = 0;
+				free (b, M_DEVBUF);
+				return 0;
+			}
+			id->id_irq = 1 << irqtab[i];
+			if (haveseen_isadev (id, CC_IRQ | CC_QUIET))
+				continue;
+#ifdef KLD_MODULE
+			if (register_intr (irqtab[i], 0, 0, (inthand2_t*)
+			    cx_intr, &net_imask, id->id_unit) != 0)
+				continue;
+			unregister_intr (irqtab[i], (inthand2_t*) cx_intr);
+#endif
+ 			if (probe_irq (b, irqtab[i]))
+ 				break;
+		}
+	}
+	cx_init (b, b->num, b->port, ffs (id->id_irq) - 1, b->dma);
+	cx_setup_board (b, 0, 0, 0);
+
+	return 1;
+}
+#endif /* __FreeBSD_version < 400000 */
+
+/*
+ * The adapter is present, initialize the driver structures.
+ */
+#if __FreeBSD_version < 400000
+static int cx_attach (struct isa_device *id)
+{
+#else
+static int cx_attach (device_t dev)
+{
+	bdrv_t *bd = device_get_softc (dev);
+	u_long iobase, drq, irq, rescount;
+	int unit = device_get_unit (dev);
+	int i;
+	int s;
+#endif
+	cx_board_t *b;
+	cx_chan_t *c;
+	drv_t *d;
+
+#if __FreeBSD_version >= 400000
+	KASSERT ((bd != NULL), ("cx%d: NULL device softc\n", unit));
+	
+	bus_get_resource (dev, SYS_RES_IOPORT, 0, &iobase, &rescount);
+	bd->base_rid = 0;
+	bd->base_res = bus_alloc_resource (dev, SYS_RES_IOPORT, &bd->base_rid,
+		iobase, iobase + NPORT, NPORT, RF_ACTIVE);
+	if (! bd->base_res) {
+		printf ("cx%d: cannot allocate base address\n", unit);
+		return ENXIO;
+	}
+	
+	if (bus_get_resource (dev, SYS_RES_DRQ, 0, &drq, &rescount) != 0) {
+		for (i = 0; (drq = dmatab [i]) != 0; i++) {
+			if (!cx_is_free_res (dev, 1, SYS_RES_DRQ,
+			    drq, drq + 1, 1))
+				continue;
+			bus_set_resource (dev, SYS_RES_DRQ, 0, drq, 1);
+			break;
+		}
+		
+		if (dmatab[i] == 0) {	
+			bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
+				bd->base_res);
+			printf ("cx%d: Couldn't get DRQ\n", unit);
+			return ENXIO;
+		}
+	}
+	
+	bd->drq_rid = 0;
+	bd->drq_res = bus_alloc_resource (dev, SYS_RES_DRQ, &bd->drq_rid,
+		drq, drq + 1, 1, RF_ACTIVE);
+	if (! bd->drq_res) {
+		printf ("cx%d: cannot allocate drq\n", unit);
+		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
+			bd->base_res);
+		return ENXIO;
+	}	
+	
+	if (bus_get_resource (dev, SYS_RES_IRQ, 0, &irq, &rescount) != 0) {
+		for (i = 0; (irq = irqtab [i]) != 0; i++) {
+			if (!cx_is_free_res (dev, 1, SYS_RES_IRQ,
+			    irq, irq + 1, 1))
+				continue;
+			bus_set_resource (dev, SYS_RES_IRQ, 0, irq, 1);
+			break;
+		}
+		
+		if (irqtab[i] == 0) {	
+			bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
+				bd->drq_res);
+			bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
+				bd->base_res);
+			printf ("cx%d: Couldn't get IRQ\n", unit);
+			return ENXIO;
+		}
+	}
+	
+	bd->irq_rid = 0;
+	bd->irq_res = bus_alloc_resource (dev, SYS_RES_IRQ, &bd->irq_rid,
+		irq, irq + 1, 1, RF_ACTIVE);
+	if (! bd->irq_res) {
+		printf ("cx%d: Couldn't allocate irq\n", unit);
+		bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
+			bd->drq_res);
+		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
+			bd->base_res);
+		return ENXIO;
+	}
+	
+	b = malloc (sizeof (cx_board_t), M_DEVBUF, M_WAITOK);
+	if (!b) {
+		printf ("cx:%d: Couldn't allocate memory\n", unit);
+		return (ENXIO);
+	}
+	adapter[unit] = b;
+	bzero (b, sizeof(cx_board_t));
+	
+	if (! cx_open_board (b, unit, iobase, irq, drq)) {
+		printf ("cx%d: error loading firmware\n", unit);
+		free (b, M_DEVBUF);
+		bus_release_resource (dev, SYS_RES_IRQ, bd->irq_rid,
+			bd->irq_res);
+		bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
+			bd->drq_res);
+		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
+			bd->base_res);
+ 		return ENXIO;
+	}
+
+	bd->board = b;
+	
+	if (! probe_irq (b, irq)) {
+		printf ("cx%d: irq %ld not functional\n", unit, irq);
+		bd->board = 0;
+		adapter [unit] = 0;
+		free (b, M_DEVBUF);
+		bus_release_resource (dev, SYS_RES_IRQ, bd->irq_rid,
+			bd->irq_res);
+		bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
+			bd->drq_res);
+		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
+			bd->base_res);
+ 		return ENXIO;
+	}
+	
+	s = splhigh ();
+	if (bus_setup_intr (dev, bd->irq_res, INTR_TYPE_NET, cx_intr, bd,
+	    &bd->intrhand)) {
+		printf ("cx%d: Can't setup irq %ld\n", unit, irq);
+		bd->board = 0;
+		adapter [unit] = 0;
+		free (b, M_DEVBUF);
+		bus_release_resource (dev, SYS_RES_IRQ, bd->irq_rid,
+			bd->irq_res);
+		bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid,
+			bd->drq_res);
+		bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid,
+			bd->base_res);
+		splx (s);
+ 		return ENXIO;		
+	}
+	
+	cx_init (b, b->num, b->port, irq, drq);
+	cx_setup_board (b, 0, 0, 0);
+#else /* __FreeBSD_version >= 400000 */
+	b = adapter[id->id_unit];
+#endif /* __FreeBSD_version >= 400000 */
+
+	printf ("cx%d: <Cronyx-Sigma-%s>\n", b->num, b->name);
+#if __FreeBSD_version < 400000
+	id->id_ointr = cx_intr;
+#endif
+
+	for (c=b->chan; c<b->chan+NCHAN; ++c) {
+#if __FreeBSD_version >= 400000
+		char *dnmt="tty %x";
+		char *dnmc="cua %x";
+#endif
+		if (c->type == T_NONE)
+			continue;
+		d = contigmalloc (sizeof(drv_t), M_DEVBUF, M_WAITOK,
+			0x100000, 0x1000000, 16, 0);
+		channel [b->num*NCHAN + c->num] = d;
+		bzero (d, sizeof(drv_t));
+		sprintf (d->name, "cx%d.%d", b->num, c->num);
+		d->board = b;
+		d->chan = c;
+		d->tty.t_oproc = cx_oproc;
+		d->tty.t_param = cx_param;
+#if __FreeBSD_version >= 400000
+		d->tty.t_stop  = cx_stop;
+#endif
+		d->dtrwait = 3 * hz;	/* Default DTR off timeout is 3 seconds. */
+		d->open_dev = 0;
+		c->sys = d;
+
+		switch (c->type) {
+		case T_SYNC_RS232:
+		case T_SYNC_V35:
+		case T_SYNC_RS449:
+		case T_UNIV:
+		case T_UNIV_RS232:
+		case T_UNIV_RS449:
+		case T_UNIV_V35:
+#ifdef NETGRAPH
+		if (ng_make_node_common (&typestruct, &d->node) != 0) {
+			printf ("%s: cannot make common node\n", d->name);
+			channel [b->num*NCHAN + c->num] = 0;
+			c->sys = 0;
+			contigfree (d, sizeof (d), M_DEVBUF);
+			continue;
+		}
+#if __FreeBSD_version >= 500000
+		NG_NODE_SET_PRIVATE (d->node, d);
+#else
+		d->node->private = d;
+#endif
+		sprintf (d->nodename, "%s%d", NG_CX_NODE_TYPE,
+			 c->board->num*NCHAN + c->num);
+		if (ng_name_node (d->node, d->nodename)) {
+			printf ("%s: cannot name node\n", d->nodename);
+#if __FreeBSD_version >= 500000
+			NG_NODE_UNREF (d->node);
+#else
+			ng_rmnode (d->node);
+			ng_unref (d->node);
+#endif
+			channel [b->num*NCHAN + c->num] = 0;
+			c->sys = 0;
+			contigfree (d, sizeof (d), M_DEVBUF);
+			continue;
+		}
+		d->lo_queue.ifq_maxlen = IFQ_MAXLEN;
+		d->hi_queue.ifq_maxlen = IFQ_MAXLEN;
+#if __FreeBSD_version >= 500000
+		mtx_init (&d->lo_queue.ifq_mtx, "cx_queue_lo", NULL, MTX_DEF);
+		mtx_init (&d->hi_queue.ifq_mtx, "cx_queue_hi", NULL, MTX_DEF);
+#endif		
+#else /*NETGRAPH*/
+		d->pp.pp_if.if_softc    = d;
+#if __FreeBSD_version > 501000
+		if_initname (&d->pp.pp_if, "cx", b->num * NCHAN + c->num);
+#else
+		d->pp.pp_if.if_unit     = b->num * NCHAN + c->num;
+		d->pp.pp_if.if_name     = "cx";
+#endif
+		d->pp.pp_if.if_mtu      = PP_MTU;
+		d->pp.pp_if.if_flags    = IFF_POINTOPOINT | IFF_MULTICAST;
+		d->pp.pp_if.if_ioctl    = cx_sioctl;
+		d->pp.pp_if.if_start    = cx_ifstart;
+		d->pp.pp_if.if_watchdog = cx_ifwatchdog;
+		d->pp.pp_if.if_init     = cx_initialize;
+		sppp_attach (&d->pp.pp_if);
+		if_attach (&d->pp.pp_if);
+		d->pp.pp_tlf            = cx_tlf;
+		d->pp.pp_tls		= cx_tls;
+#if __FreeBSD_version >= 400000 || NBPFILTER > 0
+		/* If BPF is in the kernel, call the attach for it.
+		 * Size of PPP header is 4 bytes. */
+		bpfattach (&d->pp.pp_if, DLT_PPP, 4);
+#endif
+#endif /*NETGRAPH*/
+		}
+		cx_start_chan (c, &d->buf, vtophys (&d->buf));
+		cx_register_receive (c, &cx_receive);
+		cx_register_transmit (c, &cx_transmit);
+		cx_register_error (c, &cx_error);
+		cx_register_modem (c, &cx_modem);
+#if __FreeBSD_version >= 400000
+		dnmt[3] = 'x'+b->num;
+		dnmc[3] = 'x'+b->num;
+		d->devt[0] = make_dev (&cx_cdevsw, b->num*NCHAN + c->num, UID_ROOT, GID_WHEEL, 0644, dnmt, b->num*NCHAN + c->num);
+		d->devt[1] = make_dev (&cx_cdevsw, b->num*NCHAN + c->num + 64, UID_ROOT, GID_WHEEL, 0600, "cx%d", b->num*NCHAN + c->num);
+		d->devt[2] = make_dev (&cx_cdevsw, b->num*NCHAN + c->num + 128, UID_ROOT, GID_WHEEL, 0660, dnmc, b->num*NCHAN + c->num);
+	}
+	splx (s);
+
+	return 0;
+#else /* __FreeBSD_version < 400000 */
+	}
+
+	return 1;
+#endif
+}
+
+#if __FreeBSD_version >= 400000
+static int cx_detach (device_t dev)
+{
+	bdrv_t *bd = device_get_softc (dev);
+	cx_board_t *b = bd->board;
+	cx_chan_t *c;
+	int s = splhigh ();
+	
+	/* Check if the device is busy (open). */
+	for (c = b->chan; c < b->chan + NCHAN; ++c) {
+		drv_t *d = (drv_t*) c->sys;
+
+		if (!d || d->chan->type == T_NONE)
+			continue;
+		if (d->lock) {
+			splx (s);
+			return EBUSY;
+		}
+		if (c->mode == M_ASYNC && (d->tty.t_state & TS_ISOPEN) &&
+		    (d->open_dev|0x2)) {
+			splx (s);
+			return EBUSY;
+		}
+		if (d->running) {
+			splx (s);
+			return EBUSY;
+		}
+	}
+
+	/* Deactivate the timeout routine. And soft interrupt*/
+	if (led_timo[b->num].callout)
+		untimeout (cx_led_off, b, led_timo[b->num]);
+
+	for (c = b->chan; c < b->chan + NCHAN; ++c) {
+		drv_t *d = c->sys;
+
+		if (!d || d->chan->type == T_NONE)
+			continue;
+
+		if (d->dtr_timeout_handle.callout)
+			untimeout (cx_dtrwakeup, d, d->dtr_timeout_handle);
+		if (d->dcd_timeout_handle.callout)
+			untimeout (cx_carrier, c, d->dcd_timeout_handle);
+	}
+	bus_teardown_intr (dev, bd->irq_res, bd->intrhand);
+	bus_deactivate_resource (dev, SYS_RES_IRQ, bd->irq_rid, bd->irq_res);
+	bus_release_resource (dev, SYS_RES_IRQ, bd->irq_rid, bd->irq_res);
+	
+	bus_deactivate_resource (dev, SYS_RES_DRQ, bd->drq_rid, bd->drq_res);
+	bus_release_resource (dev, SYS_RES_DRQ, bd->drq_rid, bd->drq_res);
+	
+	bus_deactivate_resource (dev, SYS_RES_IOPORT, bd->base_rid, bd->irq_res);
+	bus_release_resource (dev, SYS_RES_IOPORT, bd->base_rid, bd->base_res);
+
+	cx_close_board (b);
+
+	/* Detach the interfaces, free buffer memory. */
+	for (c = b->chan; c < b->chan + NCHAN; ++c) {
+		drv_t *d = (drv_t*) c->sys;
+
+		if (!d || d->chan->type == T_NONE)
+			continue;
+#ifdef NETGRAPH
+#if __FreeBSD_version >= 500000
+		if (d->node) {
+			ng_rmnode_self (d->node);
+			NG_NODE_UNREF (d->node);
+			d->node = NULL;
+		}
+		mtx_destroy (&d->lo_queue.ifq_mtx);
+		mtx_destroy (&d->hi_queue.ifq_mtx);
+#else
+		ng_rmnode (d->node);
+		d->node = NULL;
+#endif		
+#else
+#if __FreeBSD_version >= 410000 && NBPFILTER > 0
+		/* Detach from the packet filter list of interfaces. */
+		bpfdetach (&d->pp.pp_if);
+#endif
+		/* Detach from the sync PPP list. */
+		sppp_detach (&d->pp.pp_if);
+
+		if_detach (&d->pp.pp_if);
+#endif		
+		destroy_dev (d->devt[0]);
+		destroy_dev (d->devt[1]);
+		destroy_dev (d->devt[2]);
+	}
+
+	cx_led_off (b);
+	if (led_timo[b->num].callout)
+		untimeout (cx_led_off, b, led_timo[b->num]);
+	splx (s);
+	
+	s = splhigh ();
+	for (c = b->chan; c < b->chan + NCHAN; ++c) {
+		drv_t *d = (drv_t*) c->sys;
+
+		if (!d || d->chan->type == T_NONE)
+			continue;
+		
+		/* Deallocate buffers. */
+		contigfree (d, sizeof(d), M_DEVBUF);
+	}
+	bd->board = 0;
+	adapter [b->num] = 0;
+	free (b, M_DEVBUF);
+	splx (s);
+	
+	return 0;	
+}
+#endif
+
+#ifndef NETGRAPH
+static void cx_ifstart (struct ifnet *ifp)
+{
+        drv_t *d = ifp->if_softc;
+
+	cx_start (d);
+}
+
+static void cx_ifwatchdog (struct ifnet *ifp)
+{
+        drv_t *d = ifp->if_softc;
+
+	cx_watchdog (d);
+}
+
+static void cx_tlf (struct sppp *sp)
+{
+	drv_t *d = sp->pp_if.if_softc;
+
+	CX_DEBUG (d, ("cx_tlf\n"));
+/*	cx_set_dtr (d->chan, 0);*/
+/*	cx_set_rts (d->chan, 0);*/
+	sp->pp_down (sp);
+}
+
+static void cx_tls (struct sppp *sp)
+{
+	drv_t *d = sp->pp_if.if_softc;
+
+	CX_DEBUG (d, ("cx_tls\n"));
+	sp->pp_up (sp);
+}
+
+/*
+ * Initialization of interface.
+ * It seems to be never called by upper level.
+ */
+static void cx_initialize (void *softc)
+{
+	drv_t *d = softc;
+
+	CX_DEBUG (d, ("cx_initialize\n"));
+}
+
+/*
+ * Process an ioctl request.
+ */
+static int cx_sioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+	drv_t *d = ifp->if_softc;
+	int error, s, was_up, should_be_up;
+
+	/* No socket ioctls while the channel is in async mode. */
+	if (d->chan->type == T_NONE || d->chan->mode == M_ASYNC)
+		return EBUSY;
+
+	/* Socket ioctls on slave subchannels are not allowed. */
+	was_up = (ifp->if_flags & IFF_RUNNING) != 0;
+	error = sppp_ioctl (ifp, cmd, data);
+	if (error)
+		return error;
+
+	if (! (ifp->if_flags & IFF_DEBUG))
+		d->chan->debug = 0;
+	else if (! d->chan->debug)
+		d->chan->debug = 1;
+
+	switch (cmd) {
+	default:           CX_DEBUG2 (d, ("ioctl 0x%lx\n", cmd)); return 0;
+	case SIOCADDMULTI: CX_DEBUG2 (d, ("SIOCADDMULTI\n"));     return 0;
+	case SIOCDELMULTI: CX_DEBUG2 (d, ("SIOCDELMULTI\n"));     return 0;
+	case SIOCSIFFLAGS: CX_DEBUG2 (d, ("SIOCSIFFLAGS\n"));     break;
+	case SIOCSIFADDR:  CX_DEBUG2 (d, ("SIOCSIFADDR\n"));      break;
+	}
+
+	/* We get here only in case of SIFFLAGS or SIFADDR. */
+	s = splhigh ();
+	should_be_up = (ifp->if_flags & IFF_RUNNING) != 0;
+	if (!was_up && should_be_up) {
+		/* Interface goes up -- start it. */
+		cx_up (d);
+		cx_start (d);
+	} else if (was_up && !should_be_up) {
+		/* Interface is going down -- stop it. */
+		/* if ((d->pp.pp_flags & PP_FR) || (ifp->if_flags & PP_CISCO))*/
+		cx_down (d);
+	}
+	splx (s);
+	return 0;
+}
+#endif /*NETGRAPH*/
+
+/*
+ * Stop the interface.  Called on splimp().
+ */
+static void cx_down (drv_t *d)
+{
+	int s = splhigh ();
+	CX_DEBUG (d, ("cx_down\n"));
+	cx_set_dtr (d->chan, 0);
+	cx_set_rts (d->chan, 0);
+	d->running = 0;
+	splx (s);
+}
+
+/*
+ * Start the interface.  Called on splimp().
+ */
+static void cx_up (drv_t *d)
+{
+	int s = splhigh ();
+	CX_DEBUG (d, ("cx_up\n"));
+	cx_set_dtr (d->chan, 1);
+	cx_set_rts (d->chan, 1);
+	d->running = 1;
+	splx (s);
+}
+
+/*
+ * Start output on the (slave) interface.  Get another datagram to send
+ * off of the interface queue, and copy it to the interface
+ * before starting the output.
+ */
+static void cx_send (drv_t *d)
+{
+	struct mbuf *m;
+	u_short len;
+
+	CX_DEBUG2 (d, ("cx_send\n"));
+
+	/* No output if the interface is down. */
+	if (! d->running)
+		return;
+
+	/* No output if the modem is off. */
+	if (! cx_get_dsr (d->chan) && ! cx_get_loop(d->chan))
+		return;
+
+	if (cx_buf_free (d->chan)) {
+		/* Get the packet to send. */
+#ifdef NETGRAPH
+		IF_DEQUEUE (&d->hi_queue, m);
+		if (! m)
+			IF_DEQUEUE (&d->lo_queue, m);
+#else
+		m = sppp_dequeue (&d->pp.pp_if);
+#endif
+		if (! m)
+			return;
+#if (__FreeBSD_version >= 400000 || NBPFILTER > 0) && !defined (NETGRAPH)
+		if (d->pp.pp_if.if_bpf)
+#if __FreeBSD_version >= 500000
+			BPF_MTAP (&d->pp.pp_if, m);
+#else
+			bpf_mtap (&d->pp.pp_if, m);
+#endif
+#endif
+		len = m->m_pkthdr.len;
+		if (! m->m_next)
+			cx_send_packet (d->chan, (u_char*)mtod (m, caddr_t),
+				len, 0);
+		else {
+			u_char buf [DMABUFSZ];
+			m_copydata (m, 0, len, buf);
+			cx_send_packet (d->chan, buf, len, 0);
+		}
+		m_freem (m);
+
+		/* Set up transmit timeout, 10 seconds. */
+#ifdef NETGRAPH
+		d->timeout = 10;
+#else
+		d->pp.pp_if.if_timer = 10;
+#endif
+	}
+#ifndef NETGRAPH
+	d->pp.pp_if.if_flags |= IFF_OACTIVE;
+#endif
+}
+
+/*
+ * Start output on the interface.
+ * Always called on splimp().
+ */
+static void cx_start (drv_t *d)
+{
+	int s = splhigh ();
+	if (d->running) {
+		if (! d->chan->dtr)
+			cx_set_dtr (d->chan, 1);
+		if (! d->chan->rts)
+			cx_set_rts (d->chan, 1);
+		cx_send (d);
+	}
+	splx (s);
+}
+
+/*
+ * Handle transmit timeouts.
+ * Recover after lost transmit interrupts.
+ * Always called on splimp().
+ */
+static void cx_watchdog (drv_t *d)
+{
+	int s = splhigh ();
+	CX_DEBUG (d, ("device timeout\n"));
+	if (d->running) {
+		cx_setup_chan (d->chan);
+		cx_start_chan (d->chan, 0, 0);
+		cx_set_dtr (d->chan, 1);
+		cx_set_rts (d->chan, 1);
+		cx_start (d);
+	}
+	splx (s);
+}
+
+/*
+ * Transmit callback function.
+ */
+static void cx_transmit (cx_chan_t *c, void *attachment, int len)
+{
+	drv_t *d = c->sys;
+
+	if (!d)
+		return;
+		
+	if (c->mode == M_ASYNC) {
+		d->tty.t_state &= ~(TS_BUSY | TS_FLUSH);
+		d->atimeout = 0;
+		if (d->tty.t_dev) {
+			d->intr_action |= CX_WRITE;
+			MY_SOFT_INTR = 1;
+#if __FreeBSD_version >= 500000
+			swi_sched (cx_fast_ih, 0);
+#else
+			setsofttty ();
+#endif
+		}
+		return;
+	}
+#ifdef NETGRAPH
+	d->timeout = 0;
+#else
+	++d->pp.pp_if.if_opackets;
+	d->pp.pp_if.if_flags &= ~IFF_OACTIVE;
+	d->pp.pp_if.if_timer = 0;
+#endif
+	cx_start (d);
+}
+
+/*
+ * Process the received packet.
+ */
+static void cx_receive (cx_chan_t *c, char *data, int len)
+{
+	drv_t *d = c->sys;
+	struct mbuf *m;
+	char *cc = data;
+#if __FreeBSD_version >= 500000 && defined NETGRAPH
+	int error;
+#endif
+
+	if (!d)
+		return;
+		
+	if (c->mode == M_ASYNC) {
+		if (d->tty.t_state & TS_ISOPEN) {
+			async_q *q = &d->aqueue;
+			int size = BF_SZ - 1 - AQ_GSZ (q);
+
+			if (len <= 0 && !size)
+				return;
+
+			if (len > size) {
+			        c->ierrs++;
+				cx_error (c, CX_OVERRUN);
+				len = size - 1;
+			}
+
+			while (len--) {
+				AQ_PUSH (q, *(unsigned char *)cc);
+				cc++;
+			}
+
+			d->intr_action |= CX_READ;
+			MY_SOFT_INTR = 1;
+#if __FreeBSD_version >= 500000
+			swi_sched (cx_fast_ih, 0);
+#else
+			setsofttty ();
+#endif
+		}
+		return;
+	}
+	if (! d->running)
+		return;
+
+	m = makembuf (data, len);
+	if (! m) {
+		CX_DEBUG (d, ("no memory for packet\n"));
+#ifndef NETGRAPH
+		++d->pp.pp_if.if_iqdrops;
+#endif
+		return;
+	}
+	if (c->debug > 1)
+		printmbuf (m);
+#ifdef NETGRAPH
+	m->m_pkthdr.rcvif = 0;
+#if __FreeBSD_version >= 500000
+	NG_SEND_DATA_ONLY (error, d->hook, m);
+#else
+	ng_queue_data (d->hook, m, 0);
+#endif
+#else
+	++d->pp.pp_if.if_ipackets;
+	m->m_pkthdr.rcvif = &d->pp.pp_if;
+#if __FreeBSD_version >= 400000 || NBPFILTER > 0
+	/* Check if there's a BPF listener on this interface.
+	 * If so, hand off the raw packet to bpf. */
+	if (d->pp.pp_if.if_bpf)
+#if __FreeBSD_version >= 500000
+		BPF_TAP (&d->pp.pp_if, data, len);
+#else
+		bpf_tap (&d->pp.pp_if, data, len);
+#endif
+#endif
+	sppp_input (&d->pp.pp_if, m);
+#endif
+}
+
+#define CONDITION(t,tp) (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))\
+	    && (!(tp->t_iflag & BRKINT) || (tp->t_iflag & IGNBRK))\
+	    && (!(tp->t_iflag & PARMRK)\
+		|| (tp->t_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))\
+	    && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))\
+	    && linesw[tp->t_line].l_rint == ttyinput)
+
+/*
+ * Error callback function.
+ */
+static void cx_error (cx_chan_t *c, int data)
+{
+	drv_t *d = c->sys;
+	async_q *q;
+
+	if (!d)
+		return;
+
+	q = &(d->aqueue);
+
+	switch (data) {
+	case CX_FRAME:
+		CX_DEBUG (d, ("frame error\n"));
+		if (c->mode == M_ASYNC && (d->tty.t_state & TS_ISOPEN)
+			&& (AQ_GSZ (q) < BF_SZ - 1)
+			&& (!CONDITION((&d->tty.t_termios), (&d->tty))
+			|| !(d->tty.t_iflag & (IGNPAR | PARMRK)))) {
+			AQ_PUSH (q, TTY_FE);
+			d->intr_action |= CX_READ;
+			MY_SOFT_INTR = 1;
+#if __FreeBSD_version >= 500000
+			swi_sched (cx_fast_ih, 0);
+#else
+			setsofttty ();
+#endif
+		}
+#ifndef NETGRAPH
+		else
+			++d->pp.pp_if.if_ierrors;
+#endif
+		break;
+	case CX_CRC:
+		CX_DEBUG (d, ("crc error\n"));
+		if (c->mode == M_ASYNC && (d->tty.t_state & TS_ISOPEN)
+			&& (AQ_GSZ (q) < BF_SZ - 1)
+			&& (!CONDITION((&d->tty.t_termios), (&d->tty))
+			|| !(d->tty.t_iflag & INPCK)
+			|| !(d->tty.t_iflag & (IGNPAR | PARMRK)))) {
+			AQ_PUSH (q, TTY_PE);
+			d->intr_action |= CX_READ;
+			MY_SOFT_INTR = 1;
+#if __FreeBSD_version >= 500000
+			swi_sched (cx_fast_ih, 0);
+#else
+			setsofttty ();
+#endif
+		}
+#ifndef NETGRAPH
+		else
+			++d->pp.pp_if.if_ierrors;
+#endif
+		break;
+	case CX_OVERRUN:
+		CX_DEBUG (d, ("overrun error\n"));
+#ifdef TTY_OE
+		if (c->mode == M_ASYNC && (d->tty.t_state & TS_ISOPEN)
+			&& (AQ_GSZ (q) < BF_SZ - 1)
+			&& (!CONDITION((&d->tty.t_termios), (&d->tty)))) {
+			AQ_PUSH (q, TTY_OE);
+			d->intr_action |= CX_READ;
+			MY_SOFT_INTR = 1;
+#if __FreeBSD_version >= 500000
+			swi_sched (cx_fast_ih, 0);
+#else
+			setsofttty ();
+#endif
+		}
+#endif
+#ifndef NETGRAPH
+		else {
+			++d->pp.pp_if.if_collisions;
+			++d->pp.pp_if.if_ierrors;
+		}
+#endif
+		break;
+	case CX_OVERFLOW:
+		CX_DEBUG (d, ("overflow error\n"));
+#ifndef NETGRAPH
+		if (c->mode != M_ASYNC)
+			++d->pp.pp_if.if_ierrors;
+#endif
+		break;
+	case CX_UNDERRUN:
+		CX_DEBUG (d, ("underrun error\n"));
+		if (c->mode != M_ASYNC) {
+#ifdef NETGRAPH
+			d->timeout = 0;
+#else
+			++d->pp.pp_if.if_oerrors;
+			d->pp.pp_if.if_flags &= ~IFF_OACTIVE;
+			d->pp.pp_if.if_timer = 0;
+			cx_start (d);
+#endif
+		}
+		break;
+	case CX_BREAK:
+		CX_DEBUG (d, ("break error\n"));
+		if (c->mode == M_ASYNC && (d->tty.t_state & TS_ISOPEN)
+			&& (AQ_GSZ (q) < BF_SZ - 1)
+			&& (!CONDITION((&d->tty.t_termios), (&d->tty))
+			|| !(d->tty.t_iflag & (IGNBRK | BRKINT | PARMRK)))) {
+			AQ_PUSH (q, TTY_BI);
+			d->intr_action |= CX_READ;
+			MY_SOFT_INTR = 1;
+#if __FreeBSD_version >= 500000
+			swi_sched (cx_fast_ih, 0);
+#else
+			setsofttty ();
+#endif
+		}
+#ifndef NETGRAPH
+		else
+			++d->pp.pp_if.if_ierrors;
+#endif
+		break;
+	default:
+		CX_DEBUG (d, ("error #%d\n", data));
+	}
+}
+
+#if __FreeBSD_version < 500000
+static int cx_open (dev_t dev, int flag, int mode, struct proc *p)
+#else
+static int cx_open (dev_t dev, int flag, int mode, struct thread *td)
+#endif
+{
+	int unit = UNIT (dev);
+	drv_t *d;
+	int error;
+
+	if (unit >= NCX*NCHAN || ! (d = channel[unit]))
+		return ENXIO;
+	CX_DEBUG2 (d, ("cx_open unit=%d, flag=0x%x, mode=0x%x\n",
+		    unit, flag, mode));
+
+	if (d->chan->mode != M_ASYNC || IF_CUNIT(dev)) {
+		d->open_dev |= 0x1;
+		return 0;
+	}
+#if __FreeBSD_version >= 400000
+	dev->si_tty = &d->tty;
+#endif
+	d->tty.t_dev = dev;
+again:
+	if (d->dtroff) {
+		error = tsleep (&d->dtrwait, TTIPRI | PCATCH, "cxdtr", 0);
+		if (error)
+			return error;
+		goto again;
+	}
+
+	if ((d->tty.t_state & TS_ISOPEN) && (d->tty.t_state & TS_XCLUDE) &&
+#if __FreeBSD_version >= 500000
+		suser (td))
+#else
+	    p->p_ucred->cr_uid != 0)
+#endif
+		return EBUSY;
+
+	if (d->tty.t_state & TS_ISOPEN) {
+		/*
+		 * Cannot open /dev/cua if /dev/tty already opened.
+		 */
+		if (CALLOUT (dev) && ! d->callout)
+			return EBUSY;
+
+		/*
+		 * Opening /dev/tty when /dev/cua is already opened.
+		 * Wait for close, then try again.
+		 */
+		if (! CALLOUT (dev) && d->callout) {
+			if (flag & O_NONBLOCK)
+				return EBUSY;
+			error = tsleep (d, TTIPRI | PCATCH, "cxbi", 0);
+			if (error)
+				return error;
+			goto again;
+		}
+	} else if (d->lock && ! CALLOUT (dev) && (flag & O_NONBLOCK))
+		/*
+		 * We try to open /dev/tty in non-blocking mode
+		 * while somebody is already waiting for carrier on it.
+		 */
+		return EBUSY;
+	else {
+		ttychars (&d->tty);
+		if (d->tty.t_ispeed == 0) {
+			d->tty.t_iflag = 0;
+			d->tty.t_oflag = 0;
+			d->tty.t_lflag = 0;
+			d->tty.t_cflag = CREAD | CS8 | HUPCL;
+			d->tty.t_ispeed = d->chan->rxbaud;
+			d->tty.t_ospeed = d->chan->txbaud;
+		}
+		if (CALLOUT (dev))
+			d->tty.t_cflag |= CLOCAL;
+		else
+			d->tty.t_cflag &= ~CLOCAL;
+		cx_param (&d->tty, &d->tty.t_termios);
+		ttsetwater (&d->tty);
+	}
+
+	splhigh ();
+	if (! (d->tty.t_state & TS_ISOPEN)) {
+		cx_start_chan (d->chan, 0, 0);
+		cx_set_dtr (d->chan, 1);
+		cx_set_rts (d->chan, 1);
+		d->cd = cx_get_cd (d->chan);
+		if (CALLOUT (dev) || cx_get_cd (d->chan))
+			(*linesw[d->tty.t_line].l_modem) (&d->tty, 1);
+	}
+
+	if (! (flag & O_NONBLOCK) && ! (d->tty.t_cflag & CLOCAL) &&
+	    ! (d->tty.t_state & TS_CARR_ON)) {
+		/* Lock the channel against cxconfig while we are
+		 * waiting for carrier. */
+		d->lock++;
+		error = tsleep (&d->tty.t_rawq, TTIPRI | PCATCH, "cxdcd", 0);
+		/* Unlock the channel. */
+		d->lock--;
+		spl0 ();
+		if (error)
+			goto failed;
+		goto again;
+	}
+
+	error = (*linesw[d->tty.t_line].l_open) (dev, &d->tty);
+	disc_optim (&d->tty, &d->tty.t_termios);
+	spl0 ();
+	if (error) {
+failed:         if (! (d->tty.t_state & TS_ISOPEN)) {
+			splhigh ();
+			cx_set_dtr (d->chan, 0);
+			cx_set_rts (d->chan, 0);
+			if (d->dtrwait) {
+				d->dtr_timeout_handle =
+				    timeout (cx_dtrwakeup, d, d->dtrwait);
+				d->dtroff = 1;
+			}
+			spl0 ();
+		}
+		return error;
+	}
+
+	if (d->tty.t_state & TS_ISOPEN)
+		d->callout = CALLOUT (dev) ? 1 : 0;
+
+	d->open_dev |= 0x2;
+	CX_DEBUG2 (d, ("cx_open done\n"));
+	return 0;
+}
+
+#if __FreeBSD_version < 500000
+static int cx_close (dev_t dev, int flag, int mode, struct proc *p)
+#else
+static int cx_close (dev_t dev, int flag, int mode, struct thread *td)
+#endif
+{
+	drv_t *d = channel [UNIT (dev)];
+	int s;
+
+	CX_DEBUG2 (d, ("cx_close\n"));
+	if ((!(d->open_dev&0x2)) || IF_CUNIT(dev)){
+		d->open_dev &= ~0x1;
+		return 0;
+	}
+	s = splhigh ();
+	(*linesw[d->tty.t_line].l_close) (&d->tty, flag);
+	disc_optim (&d->tty, &d->tty.t_termios);
+
+	/* Disable receiver.
+	 * Transmitter continues sending the queued data. */
+	cx_enable_receive (d->chan, 0);
+
+	/* Clear DTR and RTS. */
+	if ((d->tty.t_cflag & HUPCL) || ! (d->tty.t_state & TS_ISOPEN)) {
+		cx_set_dtr (d->chan, 0);
+		cx_set_rts (d->chan, 0);
+		if (d->dtrwait) {
+			d->dtr_timeout_handle =
+			    timeout (cx_dtrwakeup, d, d->dtrwait);
+			d->dtroff = 1;
+		}
+	}
+	ttyclose (&d->tty);
+	splx (s);
+	d->callout = 0;
+
+	/* Wake up bidirectional opens. */
+	wakeup (d);
+	d->open_dev &= ~0x2;
+
+	return 0;
+}
+
+static int cx_read (dev_t dev, struct uio *uio, int flag)
+{
+	drv_t *d = channel [UNIT (dev)];
+
+	if (d)	CX_DEBUG2 (d, ("cx_read\n"));
+	if (!d || d->chan->mode != M_ASYNC || IF_CUNIT(dev))
+		return EBADF;
+
+	return (*linesw[d->tty.t_line].l_read) (&d->tty, uio, flag);
+}
+
+static int cx_write (dev_t dev, struct uio *uio, int flag)
+{
+	drv_t *d = channel [UNIT (dev)];
+
+	if (d) CX_DEBUG2 (d, ("cx_write\n"));
+	if (!d || d->chan->mode != M_ASYNC || IF_CUNIT(dev))
+		return EBADF;
+
+	return (*linesw[d->tty.t_line].l_write) (&d->tty, uio, flag);
+}
+
+static int cx_modem_status (drv_t *d)
+{
+	int status = 0, s = splhigh ();
+	/* Already opened by someone or network interface is up? */
+	if ((d->chan->mode == M_ASYNC && (d->tty.t_state & TS_ISOPEN) &&
+	    (d->open_dev|0x2)) || (d->chan->mode != M_ASYNC && d->running))
+		status = TIOCM_LE;      /* always enabled while open */
+
+	if (cx_get_dsr (d->chan)) status |= TIOCM_DSR;
+	if (cx_get_cd  (d->chan)) status |= TIOCM_CD;
+	if (cx_get_cts (d->chan)) status |= TIOCM_CTS;
+	if (d->chan->dtr)	  status |= TIOCM_DTR;
+	if (d->chan->rts)	  status |= TIOCM_RTS;
+	splx (s);
+	return status;
+}
+
+#if __FreeBSD_version < 500000
+static int cx_ioctl (dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
+#else
+static int cx_ioctl (dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
+#endif
+{
+	drv_t *d = channel [UNIT (dev)];
+	cx_chan_t *c;
+	struct serial_statistics *st;
+	int error, s;
+	char mask[16];
+
+	if (!d || !(c = d->chan))
+		return EINVAL;
+		
+	switch (cmd) {
+	case SERIAL_GETREGISTERED:
+	        CX_DEBUG2 (d, ("ioctl: getregistered\n"));
+		bzero (mask, sizeof(mask));
+		for (s=0; s<NCX*NCHAN; ++s)
+			if (channel [s])
+				mask [s/8] |= 1 << (s & 7);
+	        bcopy (mask, data, sizeof (mask));
+		return 0;
+
+	case SERIAL_GETPORT:
+	        CX_DEBUG2 (d, ("ioctl: getport\n"));
+		s = splhigh ();
+	        *(int *)data = cx_get_port (c);
+		splx (s);
+		if (*(int *)data<0)
+			return (EINVAL);
+		else
+			return 0;
+
+	case SERIAL_SETPORT:
+	        CX_DEBUG2 (d, ("ioctl: setproto\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+
+		s = splhigh ();
+		cx_set_port (c, *(int *)data);
+		splx (s);
+	        return 0;
+
+#ifndef NETGRAPH
+	case SERIAL_GETPROTO:
+	        CX_DEBUG2 (d, ("ioctl: getproto\n"));
+		s = splhigh ();
+	        strcpy ((char*)data, (c->mode == M_ASYNC) ? "async" :
+			/*(d->pp.pp_flags & PP_FR) ? "fr" :*/
+			(d->pp.pp_if.if_flags & PP_CISCO) ? "cisco" : "ppp");
+		splx (s);
+	        return 0;
+
+	case SERIAL_SETPROTO:
+	        CX_DEBUG2 (d, ("ioctl: setproto\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+	        if (c->mode == M_ASYNC)
+	                return EBUSY;
+		if (d->pp.pp_if.if_flags & IFF_RUNNING)
+			return EBUSY;
+	        if (! strcmp ("cisco", (char*)data)) {
+/*	                d->pp.pp_flags &= ~(PP_FR);*/
+	                d->pp.pp_flags |= PP_KEEPALIVE;
+	                d->pp.pp_if.if_flags |= PP_CISCO;
+/*	        } else if (! strcmp ("fr", (char*)data)) {*/
+/*	                d->pp.pp_if.if_flags &= ~(PP_CISCO);*/
+/*	                d->pp.pp_flags |= PP_FR | PP_KEEPALIVE;*/
+	        } else if (! strcmp ("ppp", (char*)data)) {
+	                d->pp.pp_flags &= ~(/*PP_FR |*/ PP_KEEPALIVE);
+	                d->pp.pp_if.if_flags &= ~(PP_CISCO);
+	        } else
+			return EINVAL;
+	        return 0;
+
+	case SERIAL_GETKEEPALIVE:
+	        CX_DEBUG2 (d, ("ioctl: getkeepalive\n"));
+	        if (/*(d->pp.pp_flags & PP_FR) ||*/
+		    (d->pp.pp_if.if_flags & PP_CISCO) ||
+		    (c->mode == M_ASYNC))
+			return EINVAL;
+		s = splhigh ();
+	        *(int*)data = (d->pp.pp_flags & PP_KEEPALIVE) ? 1 : 0;
+		splx (s);
+	        return 0;
+
+	case SERIAL_SETKEEPALIVE:
+	        CX_DEBUG2 (d, ("ioctl: setkeepalive\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+	        if (/*(d->pp.pp_flags & PP_FR) ||*/
+			(d->pp.pp_if.if_flags & PP_CISCO))
+			return EINVAL;
+		s = splhigh ();
+	        if (*(int*)data)
+	                d->pp.pp_flags |= PP_KEEPALIVE;
+		else
+	                d->pp.pp_flags &= ~PP_KEEPALIVE;
+		splx (s);
+	        return 0;
+#endif /*NETGRAPH*/
+
+	case SERIAL_GETMODE:
+	        CX_DEBUG2 (d, ("ioctl: getmode\n"));
+		s = splhigh ();
+		*(int*)data = (c->mode == M_ASYNC) ?
+			SERIAL_ASYNC : SERIAL_HDLC;
+		splx (s);
+	        return 0;
+
+	case SERIAL_SETMODE:
+	        CX_DEBUG2 (d, ("ioctl: setmode\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+
+	        /* Somebody is waiting for carrier? */
+	        if (d->lock)
+	                return EBUSY;
+	        /* /dev/ttyXX is already opened by someone? */
+	        if (c->mode == M_ASYNC && (d->tty.t_state & TS_ISOPEN) &&
+		    (d->open_dev|0x2))
+	                return EBUSY;
+	        /* Network interface is up?
+	         * Cannot change to async mode. */
+	        if (c->mode != M_ASYNC && d->running &&
+	            (*(int*)data == SERIAL_ASYNC))
+	                return EBUSY;
+
+		s = splhigh ();
+		if (c->mode == M_HDLC && *(int*)data == SERIAL_ASYNC) {
+			cx_set_mode (c, M_ASYNC);
+			cx_enable_receive (c, 0);
+			cx_enable_transmit (c, 0);
+		} else if (c->mode == M_ASYNC && *(int*)data == SERIAL_HDLC) {
+			cx_set_mode (c, M_HDLC);
+			cx_enable_receive (c, 1);
+			cx_enable_transmit (c, 1);
+		}
+	        splx (s);
+		return 0;
+
+	case SERIAL_GETSTAT:
+	        CX_DEBUG2 (d, ("ioctl: getestat\n"));
+	        st = (struct serial_statistics*) data;
+		s = splhigh ();
+	        st->rintr  = c->rintr;
+	        st->tintr  = c->tintr;
+	        st->mintr  = c->mintr;
+	        st->ibytes = c->ibytes;
+	        st->ipkts  = c->ipkts;
+	        st->ierrs  = c->ierrs;
+	        st->obytes = c->obytes;
+	        st->opkts  = c->opkts;
+	        st->oerrs  = c->oerrs;
+		splx (s);
+	        return 0;
+
+	case SERIAL_CLRSTAT:
+	        CX_DEBUG2 (d, ("ioctl: clrstat\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+		s = splhigh ();
+		c->rintr = 0;
+	        c->tintr = 0;
+	        c->mintr = 0;
+	        c->ibytes = 0;
+	        c->ipkts = 0;
+	        c->ierrs = 0;
+	        c->obytes = 0;
+	        c->opkts = 0;
+	        c->oerrs = 0;
+		splx (s);
+	        return 0;
+
+	case SERIAL_GETBAUD:
+	        CX_DEBUG2 (d, ("ioctl: getbaud\n"));
+	        if (c->mode == M_ASYNC)
+	                return EINVAL;
+		s = splhigh ();
+	        *(long*)data = cx_get_baud(c);
+		splx (s);
+	        return 0;
+
+	case SERIAL_SETBAUD:
+	        CX_DEBUG2 (d, ("ioctl: setbaud\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+	        if (c->mode == M_ASYNC)
+	                return EINVAL;
+		s = splhigh ();
+	        cx_set_baud (c, *(long*)data);
+	        splx (s);
+	        return 0;
+
+	case SERIAL_GETLOOP:
+	        CX_DEBUG2 (d, ("ioctl: getloop\n"));
+	        if (c->mode == M_ASYNC)
+	                return EINVAL;
+		s = splhigh ();
+	        *(int*)data = cx_get_loop (c);
+		splx (s);
+	        return 0;
+
+	case SERIAL_SETLOOP:
+	        CX_DEBUG2 (d, ("ioctl: setloop\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+	        if (c->mode == M_ASYNC)
+	                return EINVAL;
+		s = splhigh ();
+	        cx_set_loop (c, *(int*)data);
+	        splx (s);
+	        return 0;
+
+	case SERIAL_GETDPLL:
+	        CX_DEBUG2 (d, ("ioctl: getdpll\n"));
+	        if (c->mode == M_ASYNC)
+	                return EINVAL;
+		s = splhigh ();
+	        *(int*)data = cx_get_dpll (c);
+		splx (s);
+	        return 0;
+
+	case SERIAL_SETDPLL:
+	        CX_DEBUG2 (d, ("ioctl: setdpll\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+	        if (c->mode == M_ASYNC)
+	                return EINVAL;
+		s = splhigh ();
+	        cx_set_dpll (c, *(int*)data);
+	        splx (s);
+	        return 0;
+
+	case SERIAL_GETNRZI:
+	        CX_DEBUG2 (d, ("ioctl: getnrzi\n"));
+	        if (c->mode == M_ASYNC)
+	                return EINVAL;
+		s = splhigh ();
+	        *(int*)data = cx_get_nrzi (c);
+		splx (s);
+	        return 0;
+
+	case SERIAL_SETNRZI:
+	        CX_DEBUG2 (d, ("ioctl: setnrzi\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+	        if (c->mode == M_ASYNC)
+	                return EINVAL;
+		s = splhigh ();
+	        cx_set_nrzi (c, *(int*)data);
+	        splx (s);
+	        return 0;
+
+	case SERIAL_GETDEBUG:
+	        CX_DEBUG2 (d, ("ioctl: getdebug\n"));
+		s = splhigh ();
+	        *(int*)data = c->debug;
+		splx (s);
+	        return 0;
+
+	case SERIAL_SETDEBUG:
+	        CX_DEBUG2 (d, ("ioctl: setdebug\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+	        if (error)
+	                return error;
+		s = splhigh ();
+	        c->debug = *(int*)data;
+		splx (s);
+#ifndef	NETGRAPH
+		if (d->chan->debug)
+			d->pp.pp_if.if_flags |= IFF_DEBUG;
+		else
+			d->pp.pp_if.if_flags &= (~IFF_DEBUG);
+#endif
+	        return 0;
+	}
+
+	if (c->mode == M_ASYNC) {
+#if __FreeBSD_version >= 500000
+		error = (*linesw[d->tty.t_line].l_ioctl) (&d->tty, cmd, data, flag, td);
+#else
+		error = (*linesw[d->tty.t_line].l_ioctl) (&d->tty, cmd, data, flag, p);
+#endif
+		disc_optim (&d->tty, &d->tty.t_termios);
+		if (error != ENOIOCTL) {
+			if (error)
+			CX_DEBUG2 (d, ("l_ioctl: 0x%lx, error %d\n", cmd, error));
+			return error;
+		}
+		error = ttioctl (&d->tty, cmd, data, flag);
+		disc_optim (&d->tty, &d->tty.t_termios);
+		if (error != ENOIOCTL) {
+			if (error)
+			CX_DEBUG2 (d, ("ttioctl: 0x%lx, error %d\n", cmd, error));
+			return error;
+		}
+	}
+
+	switch (cmd) {
+	case TIOCSBRK:          /* Start sending line break */
+	        CX_DEBUG2 (d, ("ioctl: tiocsbrk\n"));
+		s = splhigh ();
+		cx_send_break (c, 500);
+		splx (s);
+	        return 0;
+
+	case TIOCCBRK:          /* Stop sending line break */
+	        CX_DEBUG2 (d, ("ioctl: tioccbrk\n"));
+	        return 0;
+
+	case TIOCSDTR:          /* Set DTR */
+	        CX_DEBUG2 (d, ("ioctl: tiocsdtr\n"));
+		s = splhigh ();
+		cx_set_dtr (c, 1);
+		splx (s);
+	        return 0;
+
+	case TIOCCDTR:          /* Clear DTR */
+	        CX_DEBUG2 (d, ("ioctl: tioccdtr\n"));
+		s = splhigh ();
+		cx_set_dtr (c, 0);
+		splx (s);
+	        return 0;
+
+	case TIOCMSET:          /* Set DTR/RTS */
+	        CX_DEBUG2 (d, ("ioctl: tiocmset\n"));
+		s = splhigh ();
+		cx_set_dtr (c, (*(int*)data & TIOCM_DTR) ? 1 : 0);
+		cx_set_rts (c, (*(int*)data & TIOCM_RTS) ? 1 : 0);
+		splx (s);
+	        return 0;
+
+	case TIOCMBIS:          /* Add DTR/RTS */
+	        CX_DEBUG2 (d, ("ioctl: tiocmbis\n"));
+		s = splhigh ();
+		if (*(int*)data & TIOCM_DTR) cx_set_dtr (c, 1);
+		if (*(int*)data & TIOCM_RTS) cx_set_rts (c, 1);
+		splx (s);
+	        return 0;
+
+	case TIOCMBIC:          /* Clear DTR/RTS */
+	        CX_DEBUG2 (d, ("ioctl: tiocmbic\n"));
+		s = splhigh ();
+		if (*(int*)data & TIOCM_DTR) cx_set_dtr (c, 0);
+		if (*(int*)data & TIOCM_RTS) cx_set_rts (c, 0);
+		splx (s);
+	        return 0;
+
+	case TIOCMGET:          /* Get modem status */
+	        CX_DEBUG2 (d, ("ioctl: tiocmget\n"));
+		*(int*)data = cx_modem_status (d);
+	        return 0;
+
+#ifdef TIOCMSDTRWAIT
+	case TIOCMSDTRWAIT:
+	        CX_DEBUG2 (d, ("ioctl: tiocmsdtrwait\n"));
+	        /* Only for superuser! */
+#if __FreeBSD_version < 400000
+	        error = suser (p->p_ucred, &p->p_acflag);
+#elif __FreeBSD_version < 500000
+	        error = suser (p);
+#else /* __FreeBSD_version >= 500000 */
+	        error = suser (td);
+#endif /* __FreeBSD_version >= 500000 */
+		if (error)
+			return error;
+		s = splhigh ();
+		d->dtrwait = *(int*)data * hz / 100;
+		splx (s);
+	        return 0;
+#endif
+
+#ifdef TIOCMGDTRWAIT
+	case TIOCMGDTRWAIT:
+	        CX_DEBUG2 (d, ("ioctl: tiocmgdtrwait\n"));
+		s = splhigh ();
+		*(int*)data = d->dtrwait * 100 / hz;
+		splx (s);
+	        return 0;
+#endif
+	}
+        CX_DEBUG2 (d, ("ioctl: 0x%lx\n", cmd));
+	return ENOTTY;
+}
+
+/*
+ * Wake up opens() waiting for DTR ready.
+ */
+static void cx_dtrwakeup (void *arg)
+{
+	drv_t *d = arg;
+
+	d->dtroff = 0;
+	wakeup (&d->dtrwait);
+}
+
+
+static void
+disc_optim(tp, t)
+	struct tty	*tp;
+	struct termios	*t;
+{
+	if (CONDITION(t,tp))
+		tp->t_state |= TS_CAN_BYPASS_L_RINT;
+	else
+		tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
+}
+
+#if __FreeBSD_version >= 500000
+void cx_softintr (void *unused)
+#else
+void cx_softintr ()
+#endif
+{
+	drv_t *d;
+	async_q *q;
+	int i, s, ic, k;
+	while (MY_SOFT_INTR) {
+		MY_SOFT_INTR = 0;
+		for (i=0; i<NCX*NCHAN; ++i) {
+			d = channel [i];
+			if (!d || !d->chan || d->chan->type == T_NONE
+			    || d->chan->mode != M_ASYNC || !d->tty.t_dev)
+				continue;
+			s = splhigh ();
+			if (d->intr_action & CX_READ) {
+				q = &(d->aqueue);
+				if (d->tty.t_state & TS_CAN_BYPASS_L_RINT) {
+					k = AQ_GSZ(q);
+					if (d->tty.t_rawq.c_cc + k >
+						d->tty.t_ihiwat
+					    && (d->tty.t_cflag & CRTS_IFLOW
+						|| d->tty.t_iflag & IXOFF)
+					    && !(d->tty.t_state & TS_TBLOCK))
+						ttyblock(&d->tty);
+					d->tty.t_rawcc += k;
+					while (k>0) {
+						k--;
+						AQ_POP (q, ic);
+						splx (s);
+						putc (ic, &d->tty.t_rawq);
+						s = splhigh ();
+					}
+					ttwakeup(&d->tty);
+					if (d->tty.t_state & TS_TTSTOP
+					    && (d->tty.t_iflag & IXANY
+						|| d->tty.t_cc[VSTART] ==
+						d->tty.t_cc[VSTOP])) {
+						d->tty.t_state &= ~TS_TTSTOP;
+						d->tty.t_lflag &= ~FLUSHO;
+						d->intr_action |= CX_WRITE;
+					}
+				} else {
+					while (q->end != q->beg) {
+						AQ_POP (q, ic);
+						splx (s);
+						(*linesw[d->tty.t_line].l_rint)
+							(ic, &d->tty);
+						s = splhigh ();
+					}
+				}
+				d->intr_action &= ~CX_READ;
+			}
+			splx (s);
+
+			s = splhigh ();
+			if (d->intr_action & CX_WRITE) {
+				if (d->tty.t_line)
+					(*linesw[d->tty.t_line].l_start) (&d->tty);
+				else
+					cx_oproc (&d->tty);
+				d->intr_action &= ~CX_WRITE;
+			}
+			splx (s);
+
+		}
+	}
+}
+
+/*
+ * Fill transmitter buffer with data.
+ */
+static void cx_oproc (struct tty *tp)
+{
+	int s = splhigh (), k;
+	drv_t *d = channel [UNIT (tp->t_dev)];
+	static u_char buf[DMABUFSZ];
+	u_char *p;
+	u_short len = 0, sublen = 0;
+
+	if (!d) {
+		splx (s);
+		return;
+	}
+		
+	CX_DEBUG2 (d, ("cx_oproc\n"));
+	if (tp->t_cflag & CRTSCTS && (tp->t_state & TS_TBLOCK) && d->chan->rts)
+		cx_set_rts (d->chan, 0);
+	else if (tp->t_cflag & CRTSCTS && ! (tp->t_state & TS_TBLOCK) && ! d->chan->rts)
+		cx_set_rts (d->chan, 1);
+
+	if (! (tp->t_state & (TS_TIMEOUT | TS_TTSTOP))) {
+		/* Start transmitter. */
+		cx_enable_transmit (d->chan, 1);
+
+		/* Is it busy? */
+		if (! cx_buf_free (d->chan)) {
+			tp->t_state |= TS_BUSY;
+			splx (s);
+			return;
+		}
+		if (tp->t_iflag & IXOFF) {
+			p = (buf + (DMABUFSZ/2));
+			sublen = q_to_b (&tp->t_outq, p, (DMABUFSZ/2));
+			k = sublen;
+			while (k--) {
+				/* Send XON/XOFF out of band. */
+				if (*p == tp->t_cc[VSTOP]) {
+					cx_xflow_ctl (d->chan, 0);
+					p++;
+					continue;
+				}
+				if (*p == tp->t_cc[VSTART]) {
+					cx_xflow_ctl (d->chan, 1);
+					p++;
+					continue;
+				}
+				buf[len] = *p;
+				len++;
+				p++;
+			}
+		} else {
+			p = buf;
+			len = q_to_b (&tp->t_outq, p, (DMABUFSZ/2));
+		}
+		if (len) {
+			cx_send_packet (d->chan, buf, len, 0);
+			tp->t_state |= TS_BUSY;
+			d->atimeout = 10;
+			CX_DEBUG2 (d, ("out %d bytes\n", len));
+		}
+	}
+	ttwwakeup (tp);
+	splx (s);
+}
+
+static int cx_param (struct tty *tp, struct termios *t)
+{
+	drv_t *d = channel [UNIT (tp->t_dev)];
+	int s, bits, parity;
+
+	if (!d)
+		return EINVAL;
+		
+	s = splhigh ();
+	if (t->c_ospeed == 0) {
+		/* Clear DTR and RTS. */
+		cx_set_dtr (d->chan, 0);
+		splx (s);
+		CX_DEBUG2 (d, ("cx_param (hangup)\n"));
+		return 0;
+	}
+	CX_DEBUG2 (d, ("cx_param\n"));
+
+	/* Check requested parameters. */
+	if (t->c_ospeed < 300 || t->c_ospeed > 256*1024) {
+		splx (s);
+                return EINVAL;
+	}
+	if (t->c_ispeed && (t->c_ispeed < 300 || t->c_ispeed > 256*1024)) {
+		splx (s);
+                return EINVAL;
+	}
+
+  	/* And copy them to tty and channel structures. */
+	tp->t_ispeed = t->c_ispeed = tp->t_ospeed = t->c_ospeed;
+	tp->t_cflag = t->c_cflag;
+
+	/* Set character length and parity mode. */
+	switch (t->c_cflag & CSIZE) {
+	default:
+	case CS8: bits = 8; break;
+	case CS7: bits = 7; break;
+	case CS6: bits = 6; break;
+	case CS5: bits = 5; break;
+	}
+
+	parity = ((t->c_cflag & PARENB) ? 1 : 0) *
+		 (1 + ((t->c_cflag & PARODD) ? 0 : 1));
+
+	/* Set current channel number. */
+	if (! d->chan->dtr)
+		cx_set_dtr (d->chan, 1);
+
+	disc_optim (&d->tty, &d->tty.t_termios);
+	cx_set_async_param (d->chan, t->c_ospeed, bits, parity, (t->c_cflag & CSTOPB),
+		!(t->c_cflag & PARENB), (t->c_cflag & CRTSCTS),
+		(t->c_iflag & IXON), (t->c_iflag & IXANY),
+		t->c_cc[VSTART], t->c_cc[VSTOP]);
+	splx (s);
+	return 0;
+}
+
+#if __FreeBSD_version < 400000
+static struct tty *cx_devtotty (dev_t dev)
+{
+	int unit = UNIT (dev);
+
+	if (unit == UNIT_CTL || unit >= NCX*NCHAN || ! channel[unit])
+		return 0;
+	return &channel[unit]->tty;
+}
+#endif
+
+/*
+ * Stop output on a line
+ */
+static void cx_stop (struct tty *tp, int flag)
+{
+	drv_t *d = channel [UNIT (tp->t_dev)];
+	int s;
+
+	if (!d)
+		return;
+		
+	s = splhigh ();
+
+	if (tp->t_state & TS_BUSY) {
+		/* Stop transmitter */
+		CX_DEBUG2 (d, ("cx_stop\n"));
+		cx_transmitter_ctl (d->chan, 0);
+	}
+	splx (s);
+}
+
+/*
+ * Process the (delayed) carrier signal setup.
+ */
+static void cx_carrier (void *arg)
+{
+	drv_t *d = arg;
+	cx_chan_t *c = d->chan;
+	int s, cd;
+
+	s = splhigh ();
+	cd = cx_get_cd (c);
+	if (d->cd != cd) {
+		if (cd) {
+			CX_DEBUG (d, ("carrier on\n"));
+			d->cd = 1;
+			splx (s);
+			(*linesw[d->tty.t_line].l_modem) (&d->tty, 1);
+		} else {
+			CX_DEBUG (d, ("carrier loss\n"));
+			d->cd = 0;
+			splx (s);
+			(*linesw[d->tty.t_line].l_modem) (&d->tty, 0);
+		}
+	}
+}
+
+/*
+ * Modem signal callback function.
+ */
+static void cx_modem (cx_chan_t *c)
+{
+	drv_t *d = c->sys;
+
+	if (!d || c->mode != M_ASYNC)
+		return;
+	/* Handle carrier detect/loss. */
+	untimeout (cx_carrier, c, d->dcd_timeout_handle);
+	/* Carrier changed - delay processing DCD for a while
+	 * to give both sides some time to initialize. */
+	d->dcd_timeout_handle = timeout (cx_carrier, d, hz/2);
+}
+
+#if __FreeBSD_version < 400000
+struct isa_driver cxdriver = { cx_probe, cx_attach, "cx" };
+static struct cdevsw cx_cdevsw = {
+	cx_open,	cx_close,	cx_read,	cx_write,
+	cx_ioctl,	cx_stop,	noreset,	cx_devtotty,
+	ttpoll,		nommap,		NULL,		"cx",
+	NULL,		-1,
+};
+#elif  __FreeBSD_version < 500000
+static struct cdevsw cx_cdevsw = {
+	cx_open,	cx_close,	cx_read,	cx_write,
+	cx_ioctl,	ttypoll,	nommap,		nostrategy,
+	"cx",		CDEV_MAJOR,	nodump,		nopsize,
+	D_TTY,		-1
+};
+#elif __FreeBSD_version == 500000
+static struct cdevsw cx_cdevsw = {
+	cx_open,	cx_close,	cx_read,	cx_write,
+	cx_ioctl,	ttypoll,	nommap,		nostrategy,
+	"cx",		CDEV_MAJOR,	nodump,		nopsize,
+	D_TTY,
+	};
+#elif __FreeBSD_version <= 501000 
+static struct cdevsw cx_cdevsw = {
+	.d_open     = cx_open,
+	.d_close    = cx_close,
+	.d_read     = cx_read,
+	.d_write    = cx_write,
+	.d_ioctl    = cx_ioctl,
+	.d_poll     = ttypoll,
+	.d_mmap	    = nommap,
+	.d_strategy = nostrategy,
+	.d_name     = "cx",
+	.d_maj      = CDEV_MAJOR,
+	.d_dump     = nodump,
+	.d_flags    = D_TTY,
+};
+#else /* __FreeBSD_version > 501000 */
+static struct cdevsw cx_cdevsw = {
+	.d_open     = cx_open,
+	.d_close    = cx_close,
+	.d_read     = cx_read,
+	.d_write    = cx_write,
+	.d_ioctl    = cx_ioctl,
+	.d_poll     = ttypoll,
+	.d_name     = "cx",
+	.d_maj      = CDEV_MAJOR,
+	.d_flags    = D_TTY,
+};
+#endif
+
+#ifdef NETGRAPH
+#if __FreeBSD_version >= 500000
+static int ng_cx_constructor (node_p node)
+{
+	drv_t *d = NG_NODE_PRIVATE (node);
+#else
+static int ng_cx_constructor (node_p *node)
+{
+	drv_t *d = (*node)->private;
+#endif
+	CX_DEBUG (d, ("Constructor\n"));
+	return EINVAL;
+}
+
+static int ng_cx_newhook (node_p node, hook_p hook, const char *name)
+{
+	int s;
+#if __FreeBSD_version >= 500000
+	drv_t *d = NG_NODE_PRIVATE (node);
+#else
+	drv_t *d = node->private;
+#endif
+
+	if (d->chan->mode == M_ASYNC)
+		return EINVAL;
+
+	/* Attach debug hook */
+	if (strcmp (name, NG_CX_HOOK_DEBUG) == 0) {
+#if __FreeBSD_version >= 500000
+		NG_HOOK_SET_PRIVATE (hook, NULL);
+#else
+		hook->private = 0;
+#endif
+		d->debug_hook = hook;
+		return 0;
+	}
+
+	/* Check for raw hook */
+	if (strcmp (name, NG_CX_HOOK_RAW) != 0)
+		return EINVAL;
+
+#if __FreeBSD_version >= 500000
+	NG_HOOK_SET_PRIVATE (hook, d);
+#else
+	hook->private = d;
+#endif
+	d->hook = hook;
+	s = splhigh ();
+	cx_up (d);
+	splx (s);
+	return 0;
+}
+
+static int print_modems (char *s, cx_chan_t *c, int need_header)
+{
+	int status = cx_modem_status (c->sys);
+	int length = 0;
+
+	if (need_header)
+		length += sprintf (s + length, "  LE   DTR  DSR  RTS  CTS  CD\n");
+	length += sprintf (s + length, "%4s %4s %4s %4s %4s %4s\n",
+		status & TIOCM_LE  ? "On" : "-",
+		status & TIOCM_DTR ? "On" : "-",
+		status & TIOCM_DSR ? "On" : "-",
+		status & TIOCM_RTS ? "On" : "-",
+		status & TIOCM_CTS ? "On" : "-",
+		status & TIOCM_CD  ? "On" : "-");
+	return length;
+}
+
+static int print_stats (char *s, cx_chan_t *c, int need_header)
+{
+	int length = 0;
+
+	if (need_header)
+		length += sprintf (s + length, "  Rintr   Tintr   Mintr   Ibytes   Ipkts   Ierrs   Obytes   Opkts   Oerrs\n");
+	length += sprintf (s + length, "%7ld %7ld %7ld %8ld %7ld %7ld %8ld %7ld %7ld\n",
+		c->rintr, c->tintr, c->mintr, c->ibytes, c->ipkts,
+		c->ierrs, c->obytes, c->opkts, c->oerrs);
+	return length;
+}
+
+static int print_chan (char *s, cx_chan_t *c)
+{
+	drv_t *d = c->sys;
+	int length = 0;
+
+	length += sprintf (s + length, "cx%d", c->board->num * NCHAN + c->num);
+	if (d->chan->debug)
+		length += sprintf (s + length, " debug=%d", d->chan->debug);
+
+	if (cx_get_baud (c))
+		length += sprintf (s + length, " %ld", cx_get_baud (c));
+	else
+		length += sprintf (s + length, " extclock");
+
+	if (c->mode == M_HDLC) {
+		length += sprintf (s + length, " dpll=%s", cx_get_dpll (c) ? "on" : "off");
+		length += sprintf (s + length, " nrzi=%s", cx_get_nrzi (c) ? "on" : "off");
+	}
+
+	length += sprintf (s + length, " loop=%s", cx_get_loop (c) ? "on\n" : "off\n");
+	return length;
+}
+
+#if __FreeBSD_version >= 500000
+static int ng_cx_rcvmsg (node_p node, item_p item, hook_p lasthook)
+{
+	drv_t *d = NG_NODE_PRIVATE (node);
+	struct ng_mesg *msg;
+#else
+static int ng_cx_rcvmsg (node_p node, struct ng_mesg *msg,
+	const char *retaddr, struct ng_mesg **rptr)
+{
+	drv_t *d = node->private;
+#endif
+	struct ng_mesg *resp = NULL;
+	int error = 0;
+
+	if (!d)
+		return EINVAL;
+		
+	CX_DEBUG (d, ("Rcvmsg\n"));
+#if __FreeBSD_version >= 500000
+	NGI_GET_MSG (item, msg);
+#endif
+	switch (msg->header.typecookie) {
+	default:
+		error = EINVAL;
+		break;
+
+	case NGM_CX_COOKIE:
+		printf ("Don't forget to implement\n");
+		error = EINVAL;
+		break;
+
+	case NGM_GENERIC_COOKIE:
+		switch (msg->header.cmd) {
+		default:
+			error = EINVAL;
+			break;
+
+		case NGM_TEXT_STATUS: {
+			char *s;
+			int l = 0;
+			int dl = sizeof (struct ng_mesg) + 730;
+
+#if __FreeBSD_version >= 500000	
+			NG_MKRESPONSE (resp, msg, dl, M_NOWAIT);
+			if (! resp) {
+				error = ENOMEM;
+				break;
+			}
+#else
+			MALLOC (resp, struct ng_mesg *, dl,
+				M_NETGRAPH, M_NOWAIT);
+			if (! resp) {
+				error = ENOMEM;
+				break;
+			}
+#endif
+			bzero (resp, dl);
+			s = (resp)->data;
+			l += print_chan (s + l, d->chan);
+			l += print_stats (s + l, d->chan, 1);
+			l += print_modems (s + l, d->chan, 1);
+#if __FreeBSD_version < 500000
+			(resp)->header.version = NG_VERSION;
+			(resp)->header.arglen = strlen (s) + 1;
+			(resp)->header.token = msg->header.token;
+			(resp)->header.typecookie = NGM_CX_COOKIE;
+			(resp)->header.cmd = msg->header.cmd;
+#endif
+			strncpy ((resp)->header.cmdstr, "status", NG_CMDSTRLEN);
+			}
+			break;
+		}
+		break;
+	}
+#if __FreeBSD_version >= 500000
+	NG_RESPOND_MSG (error, node, item, resp);
+	NG_FREE_MSG (msg);
+#else
+	*rptr = resp;
+	FREE (msg, M_NETGRAPH);
+#endif
+	return error;
+}
+
+#if __FreeBSD_version >= 500000
+static int ng_cx_rcvdata (hook_p hook, item_p item)
+{
+	drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE(hook));
+	struct mbuf *m;
+	meta_p meta;
+#else
+static int ng_cx_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
+{
+	drv_t *d = hook->node->private;
+#endif
+	struct ifqueue *q;
+	int s;
+
+#if __FreeBSD_version >= 500000
+	NGI_GET_M (item, m);
+	NGI_GET_META (item, meta);
+	NG_FREE_ITEM (item);
+	if (! NG_HOOK_PRIVATE (hook) || ! d) {
+		NG_FREE_M (m);
+		NG_FREE_META (meta);
+#else
+	if (! hook->private || ! d) {
+		NG_FREE_DATA (m,meta);
+#endif
+		return ENETDOWN;
+	}
+	q = (meta && meta->priority > 0) ? &d->hi_queue : &d->lo_queue;
+	s = splhigh ();
+#if __FreeBSD_version >= 500000
+	IF_LOCK (q);
+	if (_IF_QFULL (q)) {
+		_IF_DROP (q);
+		IF_UNLOCK (q);
+		splx (s);
+		NG_FREE_M (m);
+		NG_FREE_META (meta);
+		return ENOBUFS;
+	}
+	_IF_ENQUEUE (q, m);
+	IF_UNLOCK (q);
+#else
+	if (IF_QFULL (q)) {
+		IF_DROP (q);
+		splx (s);
+		NG_FREE_DATA (m, meta);
+		return ENOBUFS;
+	}
+	IF_ENQUEUE (q, m);
+#endif
+	cx_start (d);
+	splx (s);
+	return 0;
+}
+
+static int ng_cx_rmnode (node_p node)
+{
+#if __FreeBSD_version >= 500000
+	drv_t *d = NG_NODE_PRIVATE (node);
+
+	CX_DEBUG (d, ("Rmnode\n"));
+	if (d && d->running) {
+		int s = splhigh ();
+		cx_down (d);
+		splx (s);
+	}
+#ifdef	KLD_MODULE
+	if (node->nd_flags & NG_REALLY_DIE) {
+		NG_NODE_SET_PRIVATE (node, NULL);
+		NG_NODE_UNREF (node);
+	}
+	node->nd_flags &= ~NG_INVALID;
+#endif
+#else /* __FreeBSD_version < 500000 */
+	drv_t *d = node->private;
+	int s;
+
+	s = splhigh ();
+	cx_down (d);
+	splx (s);
+	node->flags |= NG_INVALID;
+	ng_cutlinks (node);
+#ifdef	KLD_MODULE
+	ng_unname (node);
+	ng_unref (node);
+#else
+	node->flags &= ~NG_INVALID;
+#endif
+#endif
+	return 0;
+}
+
+static void ng_cx_watchdog (void *arg)
+{
+	drv_t *d = arg;
+
+	if (d->timeout == 1)
+		cx_watchdog (d);
+	if (d->timeout)
+		d->timeout--;
+	d->timeout_handle = timeout (ng_cx_watchdog, d, hz);
+}
+
+static int ng_cx_connect (hook_p hook)
+{
+#if __FreeBSD_version >= 500000
+	drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE (hook));
+#else
+	drv_t *d = hook->node->private;
+#endif
+
+	d->timeout_handle = timeout (ng_cx_watchdog, d, hz);
+	return 0;
+}
+
+static int ng_cx_disconnect (hook_p hook)
+{
+#if __FreeBSD_version >= 500000
+	drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE (hook));
+#else
+	drv_t *d = hook->node->private;
+#endif
+	int s;
+
+	s = splhigh ();
+#if __FreeBSD_version >= 500000
+	if (NG_HOOK_PRIVATE (hook))
+#else
+	if (hook->private)
+#endif
+		cx_down (d);
+	splx (s);
+	untimeout (ng_cx_watchdog, d, d->timeout_handle);
+	return 0;
+}
+#endif /*NETGRAPH*/
+
+#ifdef KLD_MODULE
+#if __FreeBSD_version < 400000
+/*
+ * Function called when loading the driver.
+ */
+static int cx_load (void)
+{
+	int i;
+
+	for (i=0;i<NCX; ++i) {
+		struct isa_device id = {-1, &cxdriver, -1, 0, -1, 0, 0, (inthand2_t *)cx_intr, i, 0, 0, 0, 0 ,0 ,1 ,0 ,0};
+
+		disable_intr();
+		if (!cx_probe (&id)) {
+			enable_intr();
+			break;
+		}
+		cx_attach (&id);
+		register_intr ((adapter [i])->irq, 0, 0, (inthand2_t*) cx_intr,
+				&net_imask, id.id_unit);
+		enable_intr();
+	}
+	if (!i) {
+		/* Deactivate the timeout routine. And soft interrupt*/
+		untimeout (cx_timeout, 0, timeout_handle);
+#if __FreeBSD_version >= 500000
+		ithread_remove_handler (cx_fast_ih);
+		ithread_remove_handler (cx_slow_ih);
+#else
+		unregister_swi (SWI_TTY, cx_softintr);
+#endif
+		return ENXIO;
+	}
+	return 0;
+}
+
+/*
+ * Function called when unloading the driver.
+ */
+static int cx_unload (void)
+{
+	int i, s;
+
+	/* Check if the device is busy (open). */
+	for (i=0; i<NCX*NCHAN; ++i) {
+		drv_t *d = channel[i];
+		cx_chan_t *c;
+
+		if (!d || (c=d->chan)->type == T_NONE)
+			continue;
+		if (d->lock)
+			return EBUSY;
+		if (c->mode == M_ASYNC && (d->tty.t_state & TS_ISOPEN) &&
+			(d->open_dev|0x2))
+				return EBUSY;
+		if (d->running)
+				return EBUSY;
+
+	}
+
+	s = splhigh ();
+
+	/* Deactivate the timeout routine. And soft interrupt*/
+	untimeout (cx_timeout, 0, timeout_handle);
+	unregister_swi (SWI_TTY, cx_softintr);
+
+	for (i=0; i<NCX*NCHAN; ++i) {
+		drv_t *d = channel[i];
+		cx_chan_t *c;
+
+		if (!d || (c=d->chan)->type == T_NONE)
+			continue;
+
+		if (d->dtr_timeout_handle.callout)
+			untimeout (cx_dtrwakeup, d, d->dtr_timeout_handle);
+		if (d->dcd_timeout_handle.callout)
+			untimeout (cx_carrier, c, d->dcd_timeout_handle);
+	}
+
+	/* Close all active boards. */
+	for (i=0; i<NCX; ++i) {
+		cx_board_t *b = adapter [i];
+
+		if (!b || ! b->port)
+			continue;
+
+		cx_close_board (b);
+	}
+
+	for (i=0; i<NCX; ++i) {
+		cx_board_t *b = adapter [i];
+
+		if (!b || ! b->port)
+			continue;
+
+		if (led_timo[i].callout)
+			untimeout (cx_led_off, b, led_timo[i]);
+	}
+
+	/* OK to unload the driver, unregister the interrupt first. */
+	for (i=0; i<NCX; ++i) {
+		cx_board_t *b = adapter [i];
+
+		if (!b || ! b->port)
+			continue;
+		/* Disable the interrupt request. */
+		disable_intr();
+		unregister_intr (b->irq, (inthand2_t *)cx_intr);
+		isa_dma_release (b->dma);
+		enable_intr();
+	}
+	splx (s);
+
+	s = splhigh ();
+	/* Detach the interfaces, free buffer memory. */
+	for (i=0; i<NCX*NCHAN; ++i) {
+		drv_t *d = channel[i];
+		cx_chan_t *c;
+
+		if (!d || (c=d->chan)->type == T_NONE)
+			continue;
+
+#ifndef NETGRAPH
+#if NBPFILTER > 0
+		/* Detach from the packet filter list of interfaces. */
+		{
+			struct bpf_if *q, **b = &bpf_iflist;
+
+			while ((q = *b)) {
+				if (q->bif_ifp == d->pp.pp_if) {
+					*b = q->bif_next;
+					free (q, M_DEVBUF);
+				}
+				b = &(q->bif_next);
+			}
+		}
+#endif /* NBPFILTER */
+		/* Detach from the sync PPP list. */
+		sppp_detach (&d->pp.pp_if);
+
+		/* Detach from the system list of interfaces. */
+		{
+			struct ifaddr *ifa;
+			TAILQ_FOREACH (ifa, &d->pp.pp_if.if_addrhead, ifa_link) {
+				TAILQ_REMOVE (&d->pp.pp_if.if_addrhead, ifa, ifa_link);
+				free (ifa, M_IFADDR);
+			}
+			TAILQ_REMOVE (&ifnet, &d->pp.pp_if, if_link);
+		}
+#endif /* !NETGRAPH */
+		/* Deallocate buffers. */
+/*		free (d, M_DEVBUF);*/
+	}
+
+	for (i=0; i<NCX; ++i) {
+		cx_board_t *b = adapter [i];
+		adapter [b->num] = 0;
+		free (b, M_DEVBUF);
+	}
+
+	splx (s);
+
+	return 0;
+}
+
+#define devsw(a)	cdevsw[major((a))]
+#endif /* __FreeBSD_version < 400000 */
+#endif /* KLD_MODULE */
+
+#if __FreeBSD_version < 400000
+#ifdef KLD_MODULE
+static int cx_modevent (module_t mod, int type, void *unused)
+{
+        dev_t dev;
+	int result;
+	static int load_count = 0;
+
+	dev = makedev (CDEV_MAJOR, 0);
+	switch (type) {
+	case MOD_LOAD:
+		if (devsw(dev))
+			return (ENXIO);
+		load_count ++;
+		cdevsw_add (&dev, &cx_cdevsw, NULL);
+ 		timeout_handle = timeout (cx_timeout, 0, hz*5);
+
+		/* Software interrupt. */
+		register_swi (SWI_TTY, cx_softintr);
+
+		result = cx_load ();
+ 		return result;
+	case MOD_UNLOAD:
+		result = cx_unload ();
+		if (result)
+			return result;
+		if (devsw(dev)&&!(load_count-1)) {
+		cdevsw_add (&dev, NULL, NULL);
+		}
+		load_count --;
+		return result;
+	case MOD_SHUTDOWN:
+		break;
+	}
+	return 0;
+}
+#endif /* KLD_MODULE */
+#else /* __FreeBSD_version >= 400000 */
+static int cx_modevent (module_t mod, int type, void *unused)
+{
+        dev_t dev;
+	static int load_count = 0;
+	struct cdevsw *cdsw;
+
+	dev = makedev (CDEV_MAJOR, 0);
+	switch (type) {
+	case MOD_LOAD:
+		if ((cdsw = devsw (dev)) && cdsw->d_maj == CDEV_MAJOR) {
+			printf ("Sigma driver is already in system\n");
+			return (EEXIST);
+		}
+#if __FreeBSD_version >= 500000 && defined NETGRAPH
+		if (ng_newtype (&typestruct))
+			printf ("Failed to register ng_cx\n");
+#endif
+		++load_count;
+#if __FreeBSD_version <= 500000
+		cdevsw_add (&cx_cdevsw);
+#endif
+		timeout_handle = timeout (cx_timeout, 0, hz*5);
+		/* Software interrupt. */
+#if __FreeBSD_version < 500000
+		register_swi (SWI_TTY, cx_softintr);
+#else
+		swi_add(&tty_ithd, "tty:cx", cx_softintr, NULL, SWI_TTY, 0,
+		    &cx_fast_ih);
+		swi_add(&clk_ithd, "tty:cx", cx_softintr, NULL, SWI_TTY, 0,
+		    &cx_slow_ih);
+#endif
+		break;
+	case MOD_UNLOAD:
+		if (load_count == 1) {
+			printf ("Removing device entry for Sigma\n");
+#if __FreeBSD_version <= 500000
+			cdevsw_remove (&cx_cdevsw);
+#endif
+#if __FreeBSD_version >= 500000 && defined NETGRAPH
+			ng_rmtype (&typestruct);
+#endif			
+		}
+		if (timeout_handle.callout)
+			untimeout (cx_timeout, 0, timeout_handle);
+#if __FreeBSD_version >= 500000
+		ithread_remove_handler (cx_fast_ih);
+		ithread_remove_handler (cx_slow_ih);
+#else
+		unregister_swi (SWI_TTY, cx_softintr);
+#endif
+		--load_count;
+		break;
+	case MOD_SHUTDOWN:
+		break;
+	}
+	return 0;
+}
+#endif  /* __FreeBSD_version >= 400000 */
+
+#ifdef NETGRAPH
+static struct ng_type typestruct = {
+#if __FreeBSD_version >= 500000
+	NG_ABI_VERSION,
+#else
+	NG_VERSION,
+#endif
+	NG_CX_NODE_TYPE,
+#if __FreeBSD_version < 500000 && defined KLD_MODULE
+	cx_modevent,
+#else
+	NULL,
+#endif
+	ng_cx_constructor,
+	ng_cx_rcvmsg,
+	ng_cx_rmnode,
+	ng_cx_newhook,
+	NULL,
+	ng_cx_connect,
+	ng_cx_rcvdata,
+#if __FreeBSD_version < 500000
+	NULL,
+#endif
+	ng_cx_disconnect
+};
+
+#if __FreeBSD_version < 400000
+NETGRAPH_INIT_ORDERED (cx, &typestruct, SI_SUB_DRIVERS,\
+	SI_ORDER_MIDDLE + CDEV_MAJOR);
+#endif
+#endif /*NETGRAPH*/
+
+#if __FreeBSD_version >= 500000
+#ifdef NETGRAPH
+MODULE_DEPEND (ng_cx, netgraph, NG_ABI_VERSION, NG_ABI_VERSION, NG_ABI_VERSION);
+#else
+MODULE_DEPEND (isa_cx, sppp, 1, 1, 1);
+#endif
+#ifdef KLD_MODULE
+DRIVER_MODULE (cxmod, isa, cx_isa_driver, cx_devclass, cx_modevent, NULL);
+#else
+DRIVER_MODULE (cx, isa, cx_isa_driver, cx_devclass, cx_modevent, NULL);
+#endif
+#elif __FreeBSD_version >= 400000
+#ifdef NETGRAPH
+DRIVER_MODULE(cx, isa, cx_isa_driver, cx_devclass, ng_mod_event, &typestruct);
+#else
+DRIVER_MODULE(cx, isa, cx_isa_driver, cx_devclass, cx_modevent, 0);
+#endif
+#else /* __FreeBSD_version < 400000 */
+#ifdef KLD_MODULE
+#ifndef NETGRAPH
+static moduledata_t cxmod = { "cx", cx_modevent, NULL};
+DECLARE_MODULE (cx, cxmod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR);
+#endif
+#else /* KLD_MODULE */
+
+/*
+ * Now for some driver initialisation.
+ * Occurs ONCE during boot (very early).
+ * This is if we are NOT a loadable module.
+ */
+static void cx_drvinit (void *unused)
+{
+#if __FreeBSD_version < 400000
+        dev_t dev;
+
+	dev = makedev (CDEV_MAJOR, 0);
+	cdevsw_add (&dev, &cx_cdevsw, NULL);
+#else
+	cdevsw_add (&cx_cdevsw);
+#endif
+
+	/* Activate the timeout routine. */
+	timeout_handle = timeout (cx_timeout, 0, hz*5);
+
+	/* Software interrupt. */
+	register_swi (SWI_TTY, cx_softintr);
+#ifdef NETGRAPH
+#if 0
+	/* Register our node type in netgraph */
+	if (ng_newtype (&typestruct))
+		printf ("Failed to register ng_cx\n");
+#endif
+#endif
+}
+
+SYSINIT (cxdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR, cx_drvinit, 0)
+
+#endif /* KLD_MODULE */
+#endif /*  __FreeBSD_version < 400000 */
+#endif /* NCX */