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uk.c revision 1.13 
      1 /*	$NetBSD: uk.c,v 1.13 1995/03/24 20:17:15 glass 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 cfdriver ukcd = {
     58 	NULL, "uk", ukmatch, ukattach, DV_DULL, sizeof(struct uk_softc)
     59 };
     60 
     61 /*
     62  * This driver is so simple it uses all the default services
     63  */
     64 struct scsi_device uk_switch = {
     65 	NULL,
     66 	NULL,
     67 	NULL,
     68 	NULL,
     69 };
     70 
     71 int
     72 ukmatch(parent, match, aux)
     73 	struct device *parent;
     74 	void *match, *aux;
     75 {
     76 
     77 	return 1;
     78 }
     79 
     80 /*
     81  * The routine called by the low level scsi routine when it discovers
     82  * a device suitable for this driver.
     83  */
     84 void
     85 ukattach(parent, self, aux)
     86 	struct device *parent, *self;
     87 	void *aux;
     88 {
     89 	struct uk_softc *uk = (void *)self;
     90 	struct scsibus_attach_args *sa = aux;
     91 	struct scsi_link *sc_link = sa->sa_sc_link;
     92 
     93 	SC_DEBUG(sc_link, SDEV_DB2, ("ukattach: "));
     94 
     95 	/*
     96 	 * Store information needed to contact our base driver
     97 	 */
     98 	uk->sc_link = sc_link;
     99 	sc_link->device = &uk_switch;
    100 	sc_link->device_softc = uk;
    101 	sc_link->openings = 1;
    102 
    103 	printf(": unknown device\n");
    104 }
    105 
    106 /*
    107  * open the device.
    108  */
    109 int
    110 ukopen(dev)
    111 	dev_t dev;
    112 {
    113 	int unit;
    114 	struct uk_softc *uk;
    115 	struct scsi_link *sc_link;
    116 
    117 	unit = UKUNIT(dev);
    118 	if (unit >= ukcd.cd_ndevs)
    119 		return ENXIO;
    120 	uk = ukcd.cd_devs[unit];
    121 	if (!uk)
    122 		return ENXIO;
    123 
    124 	sc_link = uk->sc_link;
    125 
    126 	SC_DEBUG(sc_link, SDEV_DB1,
    127 	    ("ukopen: dev=0x%x (unit %d (of %d))\n", dev, unit, ukcd.cd_ndevs));
    128 
    129 	/*
    130 	 * Only allow one at a time
    131 	 */
    132 	if (sc_link->flags & SDEV_OPEN) {
    133 		printf("%s: already open\n", uk->sc_dev.dv_xname);
    134 		return EBUSY;
    135 	}
    136 
    137 	sc_link->flags |= SDEV_OPEN;
    138 
    139 	SC_DEBUG(sc_link, SDEV_DB3, ("open complete\n"));
    140 	return 0;
    141 }
    142 
    143 /*
    144  * close the device.. only called if we are the LAST
    145  * occurence of an open device
    146  */
    147 int
    148 ukclose(dev)
    149 	dev_t dev;
    150 {
    151 	struct uk_softc *uk = ukcd.cd_devs[UKUNIT(dev)];
    152 
    153 	SC_DEBUG(uk->sc_link, SDEV_DB1, ("closing\n"));
    154 	uk->sc_link->flags &= ~SDEV_OPEN;
    155 
    156 	return 0;
    157 }
    158 
    159 /*
    160  * Perform special action on behalf of the user
    161  * Only does generic scsi ioctls.
    162  */
    163 int
    164 ukioctl(dev, cmd, addr, flag, p)
    165 	dev_t dev;
    166 	u_long cmd;
    167 	caddr_t addr;
    168 	int flag;
    169 	struct proc *p;
    170 {
    171 	register struct uk_softc *uk = ukcd.cd_devs[UKUNIT(dev)];
    172 
    173 	return scsi_do_ioctl(uk->sc_link, dev, cmd, addr, flag, p);
    174 }
    175