1 /* $OpenBSD: uk.c,v 1.13 2007/11/27 16:22:14 martynas Exp $ */ 2 /* $NetBSD: uk.c,v 1.15 1996/03/17 00:59:57 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 1994 Charles Hannum. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Charles Hannum. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Dummy driver for a device we can't identify. 35 * Originally by Julian Elischer (julian@tfs.com) 36 */ 37 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/ioctl.h> 43 #include <sys/conf.h> 44 #include <sys/device.h> 45 46 #include <scsi/scsi_all.h> 47 #include <scsi/scsiconf.h> 48 49 #define UKUNIT(z) (minor(z)) 50 51 struct uk_softc { 52 struct device sc_dev; 53 struct scsi_link *sc_link; /* all the inter level info */ 54 }; 55 56 int ukmatch(struct device *, void *, void *); 57 void ukattach(struct device *, struct device *, void *); 58 59 struct cfattach uk_ca = { 60 sizeof(struct uk_softc), ukmatch, ukattach 61 }; 62 63 struct cfdriver uk_cd = { 64 NULL, "uk", DV_DULL 65 }; 66 67 /* 68 * This driver is so simple it uses all the default services 69 */ 70 struct scsi_device uk_switch = { 71 NULL, 72 NULL, 73 NULL, 74 NULL, 75 }; 76 77 int 78 ukmatch(struct device *parent, void *match, void *aux) 79 { 80 return (1); 81 } 82 83 /* 84 * The routine called by the low level scsi routine when it discovers 85 * a device suitable for this driver. 86 */ 87 void 88 ukattach(struct device *parent, struct device *self, void *aux) 89 { 90 struct uk_softc *uk = (void *)self; 91 struct scsi_attach_args *sa = aux; 92 struct scsi_link *sc_link = sa->sa_sc_link; 93 94 SC_DEBUG(sc_link, SDEV_DB2, ("ukattach: ")); 95 96 /* Store information needed to contact our base driver */ 97 uk->sc_link = sc_link; 98 sc_link->device = &uk_switch; 99 sc_link->device_softc = uk; 100 sc_link->openings = 1; 101 102 printf("\n"); 103 } 104 105 /* 106 * open the device. 107 */ 108 int 109 ukopen(dev_t dev, int flag, int fmt, struct proc *p) 110 { 111 int unit; 112 struct uk_softc *uk; 113 struct scsi_link *sc_link; 114 115 unit = UKUNIT(dev); 116 if (unit >= uk_cd.cd_ndevs) 117 return (ENXIO); 118 119 uk = uk_cd.cd_devs[unit]; 120 if (uk == NULL) 121 return (ENXIO); 122 123 sc_link = uk->sc_link; 124 125 SC_DEBUG(sc_link, SDEV_DB1, ("ukopen: dev=0x%x (unit %d (of %d))\n", 126 dev, unit, uk_cd.cd_ndevs)); 127 128 /* Only allow one at a time */ 129 if (sc_link->flags & SDEV_OPEN) 130 return (EBUSY); 131 132 sc_link->flags |= SDEV_OPEN; 133 134 SC_DEBUG(sc_link, SDEV_DB3, ("open complete\n")); 135 136 return (0); 137 } 138 139 /* 140 * close the device.. only called if we are the LAST 141 * occurrence of an open device 142 */ 143 int 144 ukclose(dev_t dev, int flag, int fmt, struct proc *p) 145 { 146 struct uk_softc *uk = uk_cd.cd_devs[UKUNIT(dev)]; 147 148 SC_DEBUG(uk->sc_link, SDEV_DB1, ("closing\n")); 149 uk->sc_link->flags &= ~SDEV_OPEN; 150 151 return (0); 152 } 153 154 /* 155 * Perform special action on behalf of the user 156 * Only does generic scsi ioctls. 157 */ 158 int 159 ukioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 160 { 161 struct uk_softc *uk = uk_cd.cd_devs[UKUNIT(dev)]; 162 163 return (scsi_do_ioctl(uk->sc_link, dev, cmd, addr, flag, p)); 164 } 165