static char     _itelid[] = "@(#)$Id: iitel.c,v 1.4 1995/07/16 10:11:10 bde Exp $";
/*******************************************************************************
 *  II - Version 0.1 $Revision: 1.4 $   $State: Exp $
 *
 * Copyright 1994 Dietmar Friede
 *******************************************************************************
 * Bug reports, patches, comments, suggestions should be sent to:
 *
 *	jkr@saarlink.de or jkrause@guug.de
 *
 *******************************************************************************
 * $Log: iitel.c,v $
 * Revision 1.4  1995/07/16  10:11:10  bde
 * Don't include <sys/tty.h> in drivers that aren't tty drivers or in general
 * files that don't depend on the internals of <sys/tty.h>
 *
 * Revision 1.3  1995/03/28  07:54:41  bde
 * Add and move declarations to fix all of the warnings from `gcc -Wimplicit'
 * (except in netccitt, netiso and netns) that I didn't notice when I fixed
 * "all" such warnings before.
 *
 * Revision 1.2  1995/02/15  06:28:27  jkh
 * Fix up include paths, nuke some warnings.
 *
 * Revision 1.1  1995/02/14  15:00:30  jkh
 * An ISDN driver that supports the EDSS1 and the 1TR6 ISDN interfaces.
 * EDSS1 is the "Euro-ISDN", 1TR6 is the soon obsolete german ISDN Interface.
 * Obtained from: Dietmar Friede <dfriede@drnhh.neuhaus.de> and
 * 	Juergen Krause <jkr@saarlink.de>
 *
 * This is only one part - the rest to follow in a couple of hours.
 * This part is a benign import, since it doesn't affect anything else.
 *
 *
 ******************************************************************************/

#include "itel.h"
#if NITEL > 0

#include "param.h"
#include "buf.h"
#include "systm.h"
#include "ioctl.h"
#include "proc.h"
#include "user.h"
#include "uio.h"
#include "kernel.h"
#include "malloc.h"

#include "gnu/isdn/isdn_ioctl.h"

int             nitel = NITEL;
static int	applnr[NITEL];
static int	next_if =0;
#define ITEL_SIZE	1024
#define OPEN		1
#define CONNECT		2
#define READ_WAIT	4
#define WRITE_WAIT	8
#define min(a,b)        ((a)<(b)?(a):(b))

static
struct itel_data
{
	char ibuf[ITEL_SIZE];
	char obuf[ITEL_SIZE];
	int state;
	int ilen, olen;
} itel_data[NITEL];

int
itelattach(int ap)
{
	struct itel_data *itel;
	if(next_if >= NITEL)
		return(-1);
	itel= &itel_data[next_if];
	itel->ilen= itel->olen= 0;
	itel->state= 0;
	applnr[next_if]= ap;
	return(next_if++);
}

int
itel_input(int no, int len, char *buf)
{
	struct itel_data *itel= &itel_data[no];

	if(itel->ilen || ( len > ITEL_SIZE))
		return(0);
	if(len)
		bcopy(buf, itel->ibuf, len);
	itel->ilen= len;
	if(itel->state & READ_WAIT)
	{
		itel->state &= ~READ_WAIT;
		wakeup((caddr_t) itel->ibuf);
	}
	return(len);
}

int
itel_out(int no, char *buf, int len)
{
	struct itel_data *itel= &itel_data[no];
	int l;

	if((itel->state & CONNECT) == 0)
		return(0);
        if((l= itel->olen) && (itel->olen <= len))
		bcopy(itel->obuf, buf, l);

	itel->olen= 0;
	if(itel->state & WRITE_WAIT)
	{
		itel->state &= ~WRITE_WAIT;
		wakeup((caddr_t) itel->obuf);
	}
	return(l);
}

void
itel_connect(int no)
{
	itel_data[no].state |= CONNECT;
}

void
itel_disconnect(int no)
{
	struct itel_data *itel= &itel_data[no];
	int s;

	s= itel->state;
	if(itel->state &= OPEN)
	{
		itel->ilen= itel->olen= 0;
		if(s & READ_WAIT)
			wakeup((caddr_t) itel->ibuf);
		if(s & WRITE_WAIT)
			wakeup((caddr_t) itel->obuf);
	}
}

int
itelopen(dev_t dev, int flags, int fmt, struct proc *p)
{
	int             err;
	struct itel_data *itel;

	if (minor(dev)>NITEL)
		return (ENXIO);

	itel= &itel_data[minor(dev)];
	if((itel->state & CONNECT) == 0)
		return(EIO);

	if(itel->state&OPEN) return(0);
	itel->ilen= itel->olen= 0;
	itel->state |= OPEN;

	return (0);
}

int
itelclose(dev_t dev, int flags, int fmt, struct proc *p)
{
	struct itel_data *itel= &itel_data[minor(dev)];

	if(itel->state & READ_WAIT)
		wakeup((caddr_t) itel->ibuf);
	if(itel->state & WRITE_WAIT)
		wakeup((caddr_t) itel->obuf);
	itel_data[minor(dev)].state &= CONNECT;
	return (0);
}

int
itelioctl (dev_t dev, int cmd, caddr_t data, int flags, struct proc *p)
{
        int     unit = minor(dev);

        switch (cmd) {
            default:
                return (ENOTTY);
        }
        return (0);
}

int
itelread(dev_t dev, struct uio * uio, int ioflag)
{
	int             x;
	int             error = 0;
	struct itel_data *itel= &itel_data[minor(dev)];

	if((itel->state & CONNECT) == 0)
		return(EIO);

	while((itel->ilen == 0) && (itel->state & CONNECT))
	{
		itel->state |= READ_WAIT;
                sleep((caddr_t) itel->ibuf, PZERO | PCATCH);
	}

	x = splhigh();
	if(itel->ilen)
	{
		error = uiomove(itel->ibuf, itel->ilen, uio);
		itel->ilen= 0;
	} else error= EIO;
	splx(x);
	return error;
}

int
itelwrite(dev_t dev, struct uio * uio, int ioflag)
{
	int             x;
	int             error = 0;
	struct itel_data *itel= &itel_data[minor(dev)];

	if((itel->state & CONNECT) == 0)
		return(EIO);

	while(itel->olen  && (itel->state & CONNECT))
	{
		itel->state |= WRITE_WAIT;
                sleep((caddr_t) itel->obuf, PZERO | PCATCH);
	}

	x = splhigh();
	if((itel->state & CONNECT) == 0)
	{
		splx(x);
		return(0);
	}

	if(itel->olen == 0)
	{
		itel->olen= min(ITEL_SIZE, uio->uio_resid);
		error = uiomove(itel->obuf, itel->olen, uio);
		isdn_output(applnr[minor(dev)]);
	}
	splx(x);
	return error;
}

#endif