1 /* 2 * Copyright (c) 1994 Charles Hannum. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by Charles Hannum. 15 * 4. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $Id: uk.c,v 1.6 1994/04/11 03:54:21 mycroft Exp $ 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->dev_unit = uk->sc_dev.dv_unit; 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); 108 109 if (unit >= ukcd.cd_ndevs) 110 return ENXIO; 111 uk = ukcd.cd_devs[unit]; 112 if (!uk) 113 return ENXIO; 114 115 sc_link = uk->sc_link; 116 117 /* 118 * Only allow one at a time 119 */ 120 if (sc_link->flags & SDEV_OPEN) { 121 printf("%s: already open\n", uk->sc_dev.dv_xname); 122 return EBUSY; 123 } 124 125 sc_link->flags |= SDEV_OPEN; 126 SC_DEBUG(sc_link, SDEV_DB1, 127 ("ukopen: dev=0x%x (unit %d (of %d))\n", unit, ukcd.cd_ndevs)); 128 129 return 0; 130 } 131 132 /* 133 * close the device.. only called if we are the LAST 134 * occurence of an open device 135 */ 136 int 137 ukclose(dev) 138 dev_t dev; 139 { 140 int unit; 141 struct uk_data *uk; 142 143 unit = UKUNIT(dev); 144 uk = ukcd.cd_devs[unit]; 145 uk->sc_link->flags &= ~SDEV_OPEN; 146 SC_DEBUG(uk->sc_link, SDEV_DB1, ("closed\n")); 147 return 0; 148 } 149 150 /* 151 * Perform special action on behalf of the user 152 * Only does generic scsi ioctls. 153 */ 154 int 155 ukioctl(dev, cmd, addr, flag) 156 dev_t dev; 157 int cmd; 158 caddr_t addr; 159 int flag; 160 { 161 int unit; 162 register struct uk_data *uk; 163 struct scsi_link *sc_link; 164 165 /* 166 * Find the device that the user is talking about 167 */ 168 unit = UKUNIT(dev); 169 uk = ukcd.cd_devs[unit]; 170 return scsi_do_ioctl(uk->sc_link, cmd, addr, flag)); 171 } 172