svr4/ppp_mod.c

   1 /*
   2  * ppp_mod.c - modload support for PPP pseudo-device driver.
   3  *
   4  * Copyright (c) 1994 The Australian National University.
   5  * All rights reserved.
   6  *
   7  * Permission to use, copy, modify, and distribute this software and its
   8  * documentation is hereby granted, provided that the above copyright
   9  * notice appears in all copies.  This software is provided without any
  10  * warranty, express or implied. The Australian National University
  11  * makes no representations about the suitability of this software for
  12  * any purpose.
  13  *
  14  * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
  15  * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  16  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
  17  * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
  18  * OF SUCH DAMAGE.
  19  *
  20  * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
  21  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  22  * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  23  * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
  24  * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
  25  * OR MODIFICATIONS.
  26  *
  27  * $Id: ppp_mod.c,v 1.3 1999/02/26 10:53:28 paulus Exp $
  28  */
  29
  30 /*
  31  * This file is used under Solaris 2.
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/param.h>
  36 #include <sys/stat.h>
  37 #include <sys/conf.h>
  38 #include <sys/modctl.h>
  39 #include <sys/sunddi.h>
  40 #include <sys/ksynch.h>
  41
  42 #ifdef __STDC__
  43 #define __P(x)  x
  44 #else
  45 #define __P(x)  ()
  46 #endif
  47
  48 static int ppp_identify __P((dev_info_t *));
  49 static int ppp_attach __P((dev_info_t *, ddi_attach_cmd_t));
  50 static int ppp_detach __P((dev_info_t *, ddi_detach_cmd_t));
  51 static int ppp_devinfo __P((dev_info_t *, ddi_info_cmd_t, void *, void **));
  52
  53 extern struct streamtab pppinfo;
  54 extern krwlock_t ppp_lower_lock;
  55
  56 static dev_info_t *ppp_dip;
  57
  58 static struct cb_ops cb_ppp_ops = {
  59     nulldev, nulldev, nodev, nodev,     /* cb_open, ... */
  60     nodev, nodev, nodev, nodev,         /* cb_dump, ... */
  61     nodev, nodev, nodev, nochpoll,      /* cb_devmap, ... */
  62     ddi_prop_op,                        /* cb_prop_op */
  63     &pppinfo,                           /* cb_stream */
  64     D_NEW|D_MP|D_MTQPAIR|D_MTOUTPERIM|D_MTOCEXCL        /* cb_flag */
  65 };
  66
  67 static struct dev_ops ppp_ops = {
  68     DEVO_REV,                           /* devo_rev */
  69     0,                                  /* devo_refcnt */
  70     ppp_devinfo,                        /* devo_getinfo */
  71     ppp_identify,                       /* devo_identify */
  72     nulldev,                            /* devo_probe */
  73     ppp_attach,                         /* devo_attach */
  74     ppp_detach,                         /* devo_detach */
  75     nodev,                              /* devo_reset */
  76     &cb_ppp_ops,                        /* devo_cb_ops */
  77     NULL                                /* devo_bus_ops */
  78 };
  79
  80 /*
  81  * Module linkage information
  82  */
  83
  84 static struct modldrv modldrv = {
  85     &mod_driverops,                     /* says this is a pseudo driver */
  86     "PPP-2.3 multiplexing driver",
  87     &ppp_ops                            /* driver ops */
  88 };
  89
  90 static struct modlinkage modlinkage = {
  91     MODREV_1,
  92     (void *) &modldrv,
  93     NULL
  94 };
  95
  96 int
  97 _init(void)
  98 {
  99     return mod_install(&modlinkage);
 100 }
 101
 102 int
 103 _fini(void)
 104 {
 105     return mod_remove(&modlinkage);
 106 }
 107
 108 int
 109 _info(mip)
 110     struct modinfo *mip;
 111 {
 112     return mod_info(&modlinkage, mip);
 113 }
 114
 115 static int
 116 ppp_identify(dip)
 117     dev_info_t *dip;
 118 {
 119     return strcmp(ddi_get_name(dip), "ppp") == 0? DDI_IDENTIFIED:
 120         DDI_NOT_IDENTIFIED;
 121 }
 122
 123 static int
 124 ppp_attach(dip, cmd)
 125     dev_info_t *dip;
 126     ddi_attach_cmd_t cmd;
 127 {
 128
 129     if (cmd != DDI_ATTACH)
 130         return DDI_FAILURE;
 131     if (ddi_create_minor_node(dip, "ppp", S_IFCHR, 0, DDI_PSEUDO, CLONE_DEV)
 132         == DDI_FAILURE) {
 133         ddi_remove_minor_node(dip, NULL);
 134         return DDI_FAILURE;
 135     }
 136     rw_init(&ppp_lower_lock, NULL, RW_DRIVER, NULL);
 137     return DDI_SUCCESS;
 138 }
 139
 140 static int
 141 ppp_detach(dip, cmd)
 142     dev_info_t *dip;
 143     ddi_detach_cmd_t cmd;
 144 {
 145     rw_destroy(&ppp_lower_lock);
 146     ddi_remove_minor_node(dip, NULL);
 147     return DDI_SUCCESS;
 148 }
 149
 150 static int
 151 ppp_devinfo(dip, cmd, arg, result)
 152     dev_info_t *dip;
 153     ddi_info_cmd_t cmd;
 154     void *arg;
 155     void **result;
 156 {
 157     int error;
 158
 159     error = DDI_SUCCESS;
 160     switch (cmd) {
 161     case DDI_INFO_DEVT2DEVINFO:
 162         if (ppp_dip == NULL)
 163             error = DDI_FAILURE;
 164         else
 165             *result = (void *) ppp_dip;
 166         break;
 167     case DDI_INFO_DEVT2INSTANCE:
 168         *result = NULL;
 169         break;
 170     default:
 171         error = DDI_FAILURE;
 172     }
 173     return error;
 174 }