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uk.c revision 1.15 
      1 /*	$NetBSD: uk.c,v 1.15 1996/03/17 00:59:57 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Charles Hannum.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by Charles Hannum.
     17  * 4. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Dummy driver for a device we can't identify.
     34  * Originally by Julian Elischer (julian (at) tfs.com)
     35  */
     36 
     37 #include <sys/types.h>
     38 #include <sys/param.h>
     39 #include <sys/errno.h>
     40 #include <sys/ioctl.h>
     41 #include <sys/device.h>
     42 
     43 #include <scsi/scsi_all.h>
     44 #include <scsi/scsiconf.h>
     45 
     46 #define	UKUNIT(z)	(minor(z))
     47 
     48 struct uk_softc {
     49 	struct device sc_dev;
     50 
     51 	struct scsi_link *sc_link;	/* all the inter level info */
     52 };
     53 
     54 int ukmatch __P((struct device *, void *, void *));
     55 void ukattach __P((struct device *, struct device *, void *));
     56 
     57 struct cfattach uk_ca = {
     58 	sizeof(struct uk_softc), ukmatch, ukattach
     59 };
     60 
     61 struct cfdriver uk_cd = {
     62 	NULL, "uk", DV_DULL
     63 };
     64 
     65 /*
     66  * This driver is so simple it uses all the default services
     67  */
     68 struct scsi_device uk_switch = {
     69 	NULL,
     70 	NULL,
     71 	NULL,
     72 	NULL,
     73 };
     74 
     75 int
     76 ukmatch(parent, match, aux)
     77 	struct device *parent;
     78 	void *match, *aux;
     79 {
     80 
     81 	return 1;
     82 }
     83 
     84 /*
     85  * The routine called by the low level scsi routine when it discovers
     86  * a device suitable for this driver.
     87  */
     88 void
     89 ukattach(parent, self, aux)
     90 	struct device *parent, *self;
     91 	void *aux;
     92 {
     93 	struct uk_softc *uk = (void *)self;
     94 	struct scsibus_attach_args *sa = aux;
     95 	struct scsi_link *sc_link = sa->sa_sc_link;
     96 
     97 	SC_DEBUG(sc_link, SDEV_DB2, ("ukattach: "));
     98 
     99 	/*
    100 	 * Store information needed to contact our base driver
    101 	 */
    102 	uk->sc_link = sc_link;
    103 	sc_link->device = &uk_switch;
    104 	sc_link->device_softc = uk;
    105 	sc_link->openings = 1;
    106 
    107 	printf("\n");
    108 	printf("%s: unknown device\n", uk->sc_dev.dv_xname);
    109 }
    110 
    111 /*
    112  * open the device.
    113  */
    114 int
    115 ukopen(dev)
    116 	dev_t dev;
    117 {
    118 	int unit;
    119 	struct uk_softc *uk;
    120 	struct scsi_link *sc_link;
    121 
    122 	unit = UKUNIT(dev);
    123 	if (unit >= uk_cd.cd_ndevs)
    124 		return ENXIO;
    125 	uk = uk_cd.cd_devs[unit];
    126 	if (!uk)
    127 		return ENXIO;
    128 
    129 	sc_link = uk->sc_link;
    130 
    131 	SC_DEBUG(sc_link, SDEV_DB1,
    132 	    ("ukopen: dev=0x%x (unit %d (of %d))\n", dev, unit, uk_cd.cd_ndevs));
    133 
    134 	/*
    135 	 * Only allow one at a time
    136 	 */
    137 	if (sc_link->flags & SDEV_OPEN) {
    138 		printf("%s: already open\n", uk->sc_dev.dv_xname);
    139 		return EBUSY;
    140 	}
    141 
    142 	sc_link->flags |= SDEV_OPEN;
    143 
    144 	SC_DEBUG(sc_link, SDEV_DB3, ("open complete\n"));
    145 	return 0;
    146 }
    147 
    148 /*
    149  * close the device.. only called if we are the LAST
    150  * occurence of an open device
    151  */
    152 int
    153 ukclose(dev)
    154 	dev_t dev;
    155 {
    156 	struct uk_softc *uk = uk_cd.cd_devs[UKUNIT(dev)];
    157 
    158 	SC_DEBUG(uk->sc_link, SDEV_DB1, ("closing\n"));
    159 	uk->sc_link->flags &= ~SDEV_OPEN;
    160 
    161 	return 0;
    162 }
    163 
    164 /*
    165  * Perform special action on behalf of the user
    166  * Only does generic scsi ioctls.
    167  */
    168 int
    169 ukioctl(dev, cmd, addr, flag, p)
    170 	dev_t dev;
    171 	u_long cmd;
    172 	caddr_t addr;
    173 	int flag;
    174 	struct proc *p;
    175 {
    176 	register struct uk_softc *uk = uk_cd.cd_devs[UKUNIT(dev)];
    177 
    178 	return scsi_do_ioctl(uk->sc_link, dev, cmd, addr, flag, p);
    179 }
    180