5879dcdb05
They shouldn't be used there either. They should have gone away about 3 years ago when the statically initialized devswitches went away, but su.c unfortunately still frobs the cdevswitch in the old way.
362 lines
8.2 KiB
C
362 lines
8.2 KiB
C
/* su: SCSI Universal. This is a universal SCSI device that
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* has a fixed minor number format. This allows you to refer
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* to your devices by BUS, ID, LUN instead of st0, st1, ...
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*
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* This code looks up the underlying device for a given SCSI
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* target and uses that driver.
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*
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*Begin copyright
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*
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* Copyright (C) 1993, 1994, 1995, HD Associates, Inc.
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* PO Box 276
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* Pepperell, MA 01463
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* 508 433 5266
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* dufault@hda.com
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*
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* This code is contributed to the University of California at Berkeley:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*End copyright
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*
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* $Id: su.c,v 1.20 1998/07/04 22:30:25 julian Exp $
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*
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* Tabstops 4
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* XXX devfs entries for this device should be handled by generic scsiconfig
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* Add a bdevsw interface.. ?
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/stat.h>
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#include <sys/buf.h>
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#include <sys/kernel.h>
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#include <scsi/scsiconf.h>
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#define CDEV_MAJOR 18
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/* These three used by ssc. */
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extern d_open_t suopen;
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extern d_close_t suclose;
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extern d_ioctl_t suioctl;
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static d_read_t suread;
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static d_write_t suwrite;
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static d_poll_t supoll;
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static d_strategy_t sustrategy;
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static struct cdevsw su_cdevsw =
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{ suopen, suclose, suread, suwrite, /*18*/
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suioctl, nostop, nullreset, nodevtotty,/* scsi */
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supoll, nommap, sustrategy, "su", NULL, -1 };
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/* Build an old style device number (unit encoded in the minor number)
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* from a base old one (no flag bits) and a full new one
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* (BUS, LUN, TARG in the minor number, and flag bits).
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*
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* OLDDEV has the major number and device unit only. It was constructed
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* at attach time and is stored in the scsi_link structure.
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*
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* NEWDEV can have whatever in it, but only the old control flags and the
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* super bit are present. IT CAN'T HAVE ANY UNIT INFORMATION or you'll
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* wind up with the wrong unit.
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*/
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#define OLD_DEV(NEWDEV, OLDDEV) ((OLDDEV) | ((NEWDEV) & 0x080000FF))
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/* cnxio: non existent device entries. */
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static d_open_t nxopen;
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static d_close_t nxclose;
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static d_read_t nxread;
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static d_write_t nxwrite;
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static d_ioctl_t nxioctl;
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#define nxstop nostop /* one void return is as good as another */
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#define nxreset noreset /* one unused function is as good as another */
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#define nxdevtotty nodevtotty /* one NULL return is as good as another */
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#define nxmmap nommap /* one -1 return is as good as another */
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#define nxstrategy nostrategy /* one NULL value is as good as another */
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static d_dump_t nxdump;
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#define nxpsize nopsize /* one NULL value is as good as another */
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static struct cdevsw cnxio = {
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nxopen,
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nxclose,
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nxread,
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nxwrite,
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nxioctl,
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nxstop,
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nxreset,
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nxdevtotty,
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seltrue,
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nxmmap,
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nxstrategy,
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"NON",
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NULL,
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-1,
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nxdump,
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nxpsize,
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0,
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0,
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-1
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};
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/* getsws: Look up the base dev switch for a given "by minor number" style
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* device.
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*/
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static int
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getsws(dev_t dev, int type, struct cdevsw **devswpp, dev_t *base)
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{
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int ret = 0;
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struct scsi_link *scsi_link;
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int chr_dev, blk_dev;
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struct cdevsw *devswp;
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int bus = SCSI_BUS(dev),
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lun = SCSI_LUN(dev),
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id = SCSI_ID(dev);
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/* Try to look up the base device by finding the major number in
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* the scsi_link structure:
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*/
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if ((scsi_link = scsi_link_get(bus, id, lun)) == 0 ||
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scsi_link->dev == NODEV)
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{
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ret = ENXIO;
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devswp = &cnxio;
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chr_dev = NODEV;
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blk_dev = NODEV;
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}
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else
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{
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int bmaj, cmaj;
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cmaj = major(scsi_link->dev);
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devswp = cdevsw[cmaj];
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chr_dev = OLD_DEV(dev, scsi_link->dev);
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bmaj = devswp->d_bmaj;
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blk_dev = OLD_DEV(dev, makedev(bmaj, minor(scsi_link->dev)));
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}
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if (devswp)
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*devswpp = devswp;
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if (type == S_IFCHR)
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*base = chr_dev;
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else
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*base = blk_dev;
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return ret;
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}
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int
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suopen(dev_t dev, int flag, int type, struct proc *p)
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{
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struct cdevsw *devswp;
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dev_t base;
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if (getsws(dev, type, &devswp, &base))
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{
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/* Device not configured? Reprobe then try again.
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*/
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int bus = SCSI_BUS(dev), lun = SCSI_LUN(dev), id = SCSI_ID(dev);
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if (scsi_probe_bus(bus, id, lun) || getsws(dev, type, &devswp,
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&base))
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return ENXIO;
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}
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/* There is a properly configured underlying device.
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* Synthesize an appropriate device number:
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*/
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return (*devswp->d_open)(base, flag, type, p);
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}
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int
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suclose(dev_t dev, int fflag, int type, struct proc *p)
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{
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struct cdevsw *devswp;
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dev_t base;
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(void)getsws(dev, type, &devswp, &base);
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return (*devswp->d_close)(base, fflag, type, p);
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}
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static void
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sustrategy(struct buf *bp)
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{
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dev_t base;
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struct cdevsw *devswp;
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dev_t dev = bp->b_dev;
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/* XXX: I have no way of knowing if this was through the
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* block or the character entry point.
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*/
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(void)getsws(dev, S_IFBLK, &devswp, &base);
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bp->b_dev = base;
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(*devswp->d_strategy)(bp);
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bp->b_dev = dev; /* strat needs a dev_t */
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}
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int
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suioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct proc *p)
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{
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struct cdevsw *devswp;
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dev_t base;
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/* XXX: I have no way of knowing if this was through the
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* block or the character entry point.
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*/
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(void)getsws(dev, S_IFCHR, &devswp, &base);
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return (*devswp->d_ioctl)(base, cmd, data, fflag, p);
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}
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static int
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suread(dev_t dev, struct uio *uio, int ioflag)
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{
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dev_t base;
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struct cdevsw *devswp;
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(void)getsws(dev, S_IFCHR, &devswp, &base);
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return (*devswp->d_read)(base, uio, ioflag);
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}
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static int
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suwrite(dev_t dev, struct uio *uio, int ioflag)
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{
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dev_t base;
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struct cdevsw *devswp;
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(void)getsws(dev, S_IFCHR, &devswp, &base);
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return (*devswp->d_write)(base, uio, ioflag);
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}
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static int
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supoll(dev_t dev, int events, struct proc *p)
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{
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dev_t base;
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struct cdevsw *devswp;
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(void)getsws(dev, S_IFCHR, &devswp, &base);
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return (*devswp->d_poll)(base, events, p);
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}
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static int
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nxopen(dev, flags, fmt, p)
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dev_t dev;
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int flags;
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int fmt;
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struct proc *p;
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{
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return (ENXIO);
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}
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static int
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nxclose(dev, flags, fmt, p)
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dev_t dev;
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int flags;
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int fmt;
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struct proc *p;
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{
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printf("nxclose(0x%x) called\n", dev);
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return (ENXIO);
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}
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static int
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nxread(dev, uio, ioflag)
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dev_t dev;
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struct uio *uio;
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int ioflag;
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{
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printf("nxread(0x%x) called\n", dev);
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return (ENXIO);
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}
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static int
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nxwrite(dev, uio, ioflag)
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dev_t dev;
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struct uio *uio;
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int ioflag;
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{
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printf("nxwrite(0x%x) called\n", dev);
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return (ENXIO);
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}
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static int
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nxioctl(dev, cmd, data, flags, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flags;
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struct proc *p;
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{
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printf("nxioctl(0x%x) called\n", dev);
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return (ENXIO);
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}
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static int
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nxdump(dev)
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dev_t dev;
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{
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printf("nxdump(0x%x) called\n", dev);
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return (ENXIO);
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}
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static su_devsw_installed = 0;
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static void
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su_drvinit(void *unused)
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{
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dev_t dev;
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if( ! su_devsw_installed ) {
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev,&su_cdevsw, NULL);
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su_devsw_installed = 1;
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}
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}
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SYSINIT(sudev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,su_drvinit,NULL)
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