1 /* $NetBSD: uk.c,v 1.11 1994/11/21 11:28:57 mycroft 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_data { 49 struct device sc_dev; 50 51 struct scsi_link *sc_link; /* all the inter level info */ 52 }; 53 54 void ukattach __P((struct device *, struct device *, void *)); 55 56 struct cfdriver ukcd = { 57 NULL, "uk", scsi_targmatch, ukattach, DV_DULL, sizeof(struct uk_data) 58 }; 59 60 /* 61 * This driver is so simple it uses all the default services 62 */ 63 struct scsi_device uk_switch = { 64 NULL, 65 NULL, 66 NULL, 67 NULL, 68 "uk", 69 0 70 }; 71 72 /* 73 * The routine called by the low level scsi routine when it discovers 74 * a device suitable for this driver. 75 */ 76 void 77 ukattach(parent, self, aux) 78 struct device *parent, *self; 79 void *aux; 80 { 81 struct uk_data *uk = (void *)self; 82 struct scsi_link *sc_link = aux; 83 84 SC_DEBUG(sc_link, SDEV_DB2, ("ukattach: ")); 85 86 /* 87 * Store information needed to contact our base driver 88 */ 89 uk->sc_link = sc_link; 90 sc_link->device = &uk_switch; 91 sc_link->device_softc = uk; 92 93 printf(": unknown device\n"); 94 } 95 96 /* 97 * open the device. 98 */ 99 int 100 ukopen(dev) 101 dev_t dev; 102 { 103 int unit; 104 struct uk_data *uk; 105 struct scsi_link *sc_link; 106 107 unit = UKUNIT(dev); 108 if (unit >= ukcd.cd_ndevs) 109 return ENXIO; 110 uk = ukcd.cd_devs[unit]; 111 if (!uk) 112 return ENXIO; 113 114 sc_link = uk->sc_link; 115 116 SC_DEBUG(sc_link, SDEV_DB1, 117 ("ukopen: dev=0x%x (unit %d (of %d))\n", dev, unit, ukcd.cd_ndevs)); 118 119 /* 120 * Only allow one at a time 121 */ 122 if (sc_link->flags & SDEV_OPEN) { 123 printf("%s: already open\n", uk->sc_dev.dv_xname); 124 return EBUSY; 125 } 126 127 sc_link->flags |= SDEV_OPEN; 128 129 SC_DEBUG(sc_link, SDEV_DB3, ("open complete\n")); 130 return 0; 131 } 132 133 /* 134 * close the device.. only called if we are the LAST 135 * occurence of an open device 136 */ 137 int 138 ukclose(dev) 139 dev_t dev; 140 { 141 struct uk_data *uk = ukcd.cd_devs[UKUNIT(dev)]; 142 143 SC_DEBUG(uk->sc_link, SDEV_DB1, ("closing\n")); 144 uk->sc_link->flags &= ~SDEV_OPEN; 145 146 return 0; 147 } 148 149 /* 150 * Perform special action on behalf of the user 151 * Only does generic scsi ioctls. 152 */ 153 int 154 ukioctl(dev, cmd, addr, flag) 155 dev_t dev; 156 u_long cmd; 157 caddr_t addr; 158 int flag; 159 { 160 register struct uk_data *uk = ukcd.cd_devs[UKUNIT(dev)]; 161 162 return scsi_do_ioctl(uk->sc_link, dev, cmd, addr, flag)); 163 } 164