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static char _itelid[] = "@(#)$Id: iitel.c,v 1.12 1996/03/28 14:27:51 scrappy Exp $";
/*******************************************************************************
* II - Version 0.1 $Revision: 1.12 $ $State: Exp $
*
* Copyright 1994 Dietmar Friede
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* jkr@saarlink.de or jkrause@guug.de
*
*******************************************************************************
*/
#include "itel.h"
#if NITEL > 0
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include "gnu/isdn/isdn_ioctl.h"
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 d_open_t itelopen;
static d_close_t itelclose;
static d_read_t itelread;
static d_write_t itelwrite;
static d_ioctl_t itelioctl;
#define CDEV_MAJOR 57
static struct cdevsw itel_cdevsw =
{ itelopen, itelclose, itelread, itelwrite, /*57*/
itelioctl, nostop, nullreset, nodevtotty,/* itel */
seltrue, nommap, NULL, "itel", NULL, -1 };
static
struct itel_data
{
char ibuf[ITEL_SIZE];
char obuf[ITEL_SIZE];
int state;
int ilen, olen;
#ifdef DEVFS
void *devfs_token;
#endif
} 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;
#ifdef DEVFS
itel->devfs_token =
devfs_add_devswf(&itel_cdevsw, next_if, DV_CHR, 0, 0,
0600, "isdn/itel%d", next_if);
#endif
return(next_if++);
}
int
itel_input(int no, int len, char *buf, int dir)
{
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;
tsleep((caddr_t) itel->ibuf, PZERO | PCATCH, "itelrd", 0);
}
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;
tsleep((caddr_t) itel->obuf, PZERO | PCATCH, "itelwr", 0);
}
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;
}
static itel_devsw_installed = 0;
static void itel_drvinit(void *unused)
{
dev_t dev;
if( ! itel_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev,&itel_cdevsw, NULL);
itel_devsw_installed = 1;
}
}
SYSINIT(iteldev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,itel_drvinit,NULL)
#endif
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