usr/src/uts/common/io/options.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27
  28 #include <sys/types.h>
  29 #include <sys/errno.h>
  30 #include <sys/conf.h>
  31 #include <sys/ddi.h>
  32 #include <sys/sunddi.h>
  33
  34 /*
  35  * Configuration information
  36  */
  37
  38 static int options_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg,
  39                 void **result);
  40 static int options_attach(dev_info_t *devi, ddi_attach_cmd_t cmd);
  41 static int options_detach(dev_info_t *devi, ddi_detach_cmd_t cmd);
  42 static dev_info_t *options_devi;
  43
  44 struct dev_ops  options_ops = {
  45
  46         DEVO_REV,               /* devo_rev, */
  47         0,                      /* refcnt  */
  48         options_info,           /* info */
  49         nulldev,                /* identify */
  50         nulldev,                /* probe */
  51         options_attach,         /* attach */
  52         options_detach,         /* detach */
  53         nodev,                  /* reset */
  54         (struct cb_ops *)0,     /* driver operations */
  55         (struct bus_ops *)0,    /* bus operations */
  56         nulldev,                /* power */
  57         ddi_quiesce_not_needed,         /* quiesce */
  58
  59 };
  60
  61 /*
  62  * Autoload Data and Autoload Entry
  63  */
  64
  65 #include <sys/modctl.h>
  66
  67 extern struct mod_ops mod_driverops;
  68 static struct modldrv modldrv = {
  69         &mod_driverops, /* Type of module. This one is a driver */
  70         "options driver",       /* Name of the module. */
  71         &options_ops,   /* driver ops */
  72 };
  73
  74 static struct modlinkage modlinkage = {
  75         MODREV_1, (void *)&modldrv
  76 };
  77
  78 /*
  79  * This is the driver initialization routine.
  80  */
  81
  82 int
  83 _init()
  84 {
  85         return (mod_install(&modlinkage));
  86 }
  87
  88 int
  89 _fini()
  90 {
  91         return (EBUSY);
  92 }
  93
  94 int
  95 _info(modinfop)
  96         struct modinfo *modinfop;
  97 {
  98         return (mod_info(&modlinkage, modinfop));
  99 }
 100
 101 /* ARGSUSED */
 102 static int
 103 options_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
 104 {
 105         register int error;
 106
 107         switch (infocmd) {
 108         case DDI_INFO_DEVT2DEVINFO:
 109                 if (options_devi == NULL) {
 110                         error = DDI_FAILURE;
 111                 } else {
 112                         *result = (void *) options_devi;
 113                         error = DDI_SUCCESS;
 114                 }
 115                 break;
 116         case DDI_INFO_DEVT2INSTANCE:
 117                 *result = (void *)0;
 118                 error = DDI_SUCCESS;
 119                 break;
 120         default:
 121                 error = DDI_FAILURE;
 122         }
 123         return (error);
 124 }
 125
 126 static int
 127 options_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
 128 {
 129         switch (cmd) {
 130         case DDI_ATTACH:
 131                 options_devi = devi;
 132                 return (DDI_SUCCESS);
 133
 134         case DDI_RESUME:
 135                 return (DDI_SUCCESS);
 136
 137         default:
 138                 return (DDI_FAILURE);
 139         }
 140 }
 141
 142 /*ARGSUSED*/
 143 static int
 144 options_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
 145 {
 146         switch (cmd) {
 147         case DDI_SUSPEND:
 148                 return (DDI_SUCCESS);
 149
 150         case DDI_DETACH:
 151         default:
 152                 return (DDI_FAILURE);
 153         }
 154 }