FreeBSD/Linux Kernel Cross Reference
sys/dev/scsipi/uk.c

     /*      $NetBSD: uk.c,v 1.65 2016/11/20 15:37:19 mlelstv Exp $  */
     
     /*-
      * Copyright (c) 1998 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Charles M. Hannum.
      *
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    /*
     * Dummy driver for a device we can't identify.
     * Originally by Julian Elischer (julian@tfs.com)
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: uk.c,v 1.65 2016/11/20 15:37:19 mlelstv Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    
    #include <sys/errno.h>
    #include <sys/ioctl.h>
    #include <sys/device.h>
    #include <sys/conf.h>
    #include <sys/vnode.h>
    
    #include <dev/scsipi/scsi_all.h>
    #include <dev/scsipi/scsipi_all.h>
    #include <dev/scsipi/scsiconf.h>
    
    struct uk_softc {
            device_t sc_dev;
    
            struct scsipi_periph *sc_periph; /* all the inter level info */
    };
    
    static int      ukmatch(device_t, cfdata_t, void *);
    static void     ukattach(device_t, device_t, void *);
    static int      ukdetach(device_t, int);
    
    CFATTACH_DECL_NEW(
        uk,
        sizeof(struct uk_softc),
        ukmatch,
        ukattach,
        ukdetach,
        NULL
    );
    
    extern struct cfdriver uk_cd;
    
    static dev_type_open(ukopen);
    static dev_type_close(ukclose);
    static dev_type_ioctl(ukioctl);
    
    const struct cdevsw uk_cdevsw = {
            .d_open = ukopen,
            .d_close = ukclose,
            .d_read = noread,
            .d_write = nowrite,
            .d_ioctl = ukioctl,
            .d_stop = nostop,
            .d_tty = notty,
            .d_poll = nopoll,
            .d_mmap = nommap,
            .d_kqfilter = nokqfilter,
            .d_discard = nodiscard,
            .d_flag = D_OTHER | D_MPSAFE
    };
    
    static int
    ukmatch(device_t parent, cfdata_t match, void *aux)
    {
            return 1;
    }
    
    /*
    * The routine called by the low level scsi routine when it discovers
    * a device suitable for this driver.
    */
   static void
   ukattach(device_t parent, device_t self, void *aux)
   {
           struct uk_softc *uk = device_private(self);
           struct scsipibus_attach_args *sa = aux;
           struct scsipi_periph *periph = sa->sa_periph;
   
           SC_DEBUG(periph, SCSIPI_DB2, ("ukattach: "));
           uk->sc_dev = self;
   
           /* Store information needed to contact our base driver */
           uk->sc_periph = periph;
           periph->periph_dev = uk->sc_dev;
   
           aprint_naive("\n");
           aprint_normal("\n");
   
           if (!pmf_device_register(self, NULL, NULL))
                   aprint_error_dev(self, "couldn't establish power handler\n");
   }
   
   static int
   ukdetach(device_t self, int flags)
   {
           int cmaj, mn;
   
           /* locate the major number */
           cmaj = cdevsw_lookup_major(&uk_cdevsw);
   
           /* Nuke the vnodes for any open instances */
           mn = device_unit(self);
           vdevgone(cmaj, mn, mn, VCHR);
   
           return 0;
   }
   
   static int
   ukopen(dev_t dev, int flag, int fmt, struct lwp *l)
   {
           int unit, error;
           struct uk_softc *uk;
           struct scsipi_periph *periph;
           struct scsipi_adapter *adapt;
   
           unit = minor(dev);
           uk = device_lookup_private(&uk_cd, unit);
           if (uk == NULL)
                   return ENXIO;
   
           periph = uk->sc_periph;
           adapt = periph->periph_channel->chan_adapter;
   
           SC_DEBUG(periph, SCSIPI_DB1,
               ("ukopen: dev=0x%"PRIx64" (unit %d (of %d))\n", dev, unit,
                   uk_cd.cd_ndevs));
   
           /* Only allow one at a time */
           if (periph->periph_flags & PERIPH_OPEN) {
                   aprint_error_dev(uk->sc_dev, "already open\n");
                   return EBUSY;
           }
   
           if ((error = scsipi_adapter_addref(adapt)) != 0)
                   return error;
           periph->periph_flags |= PERIPH_OPEN;
   
           SC_DEBUG(periph, SCSIPI_DB3, ("open complete\n"));
           return 0;
   }
   
   static int
   ukclose(dev_t dev, int flag, int fmt, struct lwp *l)
   {
           struct uk_softc *uk = device_lookup_private(&uk_cd, minor(dev));
           struct scsipi_periph *periph = uk->sc_periph;
           struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter;
   
           SC_DEBUG(uk->sc_periph, SCSIPI_DB1, ("closing\n"));
   
           scsipi_wait_drain(periph);
   
           scsipi_adapter_delref(adapt);
           periph->periph_flags &= ~PERIPH_OPEN;
   
           return 0;
   }
   
   /*
    * Perform special action on behalf of the user.
    * Only does generic scsi ioctls.
    */
   static int
   ukioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
   {
           struct uk_softc *uk = device_lookup_private(&uk_cd, minor(dev));
   
           return scsipi_do_ioctl(uk->sc_periph, dev, cmd, addr, flag, l);
   }

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