Annotation of sys/scsi/uk.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: uk.c,v 1.12 2006/11/28 16:56:50 dlg 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: * occurence 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: }
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