/* "superscsi" pseudo device.
* "superscsi" supports general SCSI utilities that can iterate
* over all SCSI targets, including those without device entry
* points.
*
* "superscsi" supports the SCIOCADDR ioctl to change the BUS, ID, LUN
* of the target so that you can get to all devices. The only thing
* you can do to "superscsi" is open it, set the target, perform ioctl
* calls, and close it.
*
* Keep "superscsi" protected: you can drive a truck through the
* security hole if you don't.
*
*Begin copyright
*
* Copyright (C) 1993, 1994, 1995, HD Associates, Inc.
* PO Box 276
* Pepperell, MA 01463
* 508 433 5266
* dufault@hda.com
*
* This code is contributed to the University of California at Berkeley:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*End copyright
* $Id: ssc.c,v 1.9 1995/12/08 23:22:26 phk Exp $
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/scsiio.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/systm.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <scsi/scsiconf.h>
static d_open_t sscopen;
static d_close_t sscclose;
static d_ioctl_t sscioctl;
extern d_open_t suopen;
extern d_close_t suclose;
extern d_ioctl_t suioctl;
#define CDEV_MAJOR 49
static struct cdevsw ssc_cdevsw =
{ sscopen, sscclose, noread, nowrite, /*49*/
sscioctl, nostop, nullreset, nodevtotty,
noselect, nommap, nostrategy, "ssc", NULL, -1 };
static dev_t sscdev = NODEV;
static int
sscopen(dev_t dev, int flag, int type, struct proc *p)
{
if (sscdev != NODEV)
return suopen(sscdev, flag, type, p);
return 0;
}
static int
sscclose(dev_t dev, int fflag, int type, struct proc *p)
{
if (sscdev != NODEV)
return suclose(sscdev, fflag, type, p);
return 0;
}
static int
sscioctl(dev_t dev, int cmd, caddr_t data, int fflag, struct proc *p)
{
if (cmd == SCIOCADDR)
{
struct scsi_addr *sca = (struct scsi_addr *) data;
dev_t newdev = SCSI_MKFIXED(sca->scbus,sca->target,sca->lun);
int ret;
if (sscdev != NODEV)
{
suclose(sscdev, fflag, S_IFCHR, p);
sscdev = NODEV;
}
if ( (ret = suopen(newdev, fflag, S_IFCHR, p)) )
return ret;
sscdev = newdev;
return 0;
}
if (sscdev != NODEV)
return suioctl(sscdev, cmd, data, fflag, p);
return ENXIO;
}
/*
* I've elected not to support any other entries. There really is no
* good reason other than I'm not sure how you would use them.
*/
static ssc_devsw_installed = 0;
static void *ssc_devfs_token;
static void
ssc_drvinit(void *unused)
{
dev_t dev;
if( ! ssc_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev,&ssc_cdevsw, NULL);
ssc_devsw_installed = 1;
#ifdef DEVFS
ssc_devfs_token = devfs_add_devsw(
"/scsi", "ssc", &ssc_cdevsw, 0,
DV_CHR, 0, 0, 0600);
#endif
}
}
SYSINIT(sscdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ssc_drvinit,NULL)
