Annotation of sys/scsi/uk.c, Revision 1.1.1.1
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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