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 }