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@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