drivers/isdn/divert/divert_init.c

   1 /* $Id divert_init.c,v 1.5.6.2 2001/01/24 22:18:17 kai Exp $
   2  *
   3  * Module init for DSS1 diversion services for i4l.
   4  *
   5  * Copyright 1999       by Werner Cornelius (werner@isdn4linux.de)
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15
  16 #include "isdn_divert.h"
  17
  18 MODULE_DESCRIPTION("ISDN4Linux: Call diversion support");
  19 MODULE_AUTHOR("Werner Cornelius");
  20 MODULE_LICENSE("GPL");
  21
  22 /****************************************/
  23 /* structure containing interface to hl */
  24 /****************************************/
  25 isdn_divert_if divert_if = {
  26         DIVERT_IF_MAGIC,        /* magic value */
  27         DIVERT_CMD_REG,         /* register cmd */
  28         ll_callback,            /* callback routine from ll */
  29         NULL,                   /* command still not specified */
  30         NULL,                   /* drv_to_name */
  31         NULL,                   /* name_to_drv */
  32 };
  33
  34 /*************************/
  35 /* Module interface code */
  36 /* no cmd line parms     */
  37 /*************************/
  38 static int __init divert_init(void)
  39 {
  40         int i;
  41
  42         if (divert_dev_init()) {
  43                 printk(KERN_WARNING "dss1_divert: cannot install device, not loaded\n");
  44                 return (-EIO);
  45         }
  46         if ((i = DIVERT_REG_NAME(&divert_if)) != DIVERT_NO_ERR) {
  47                 divert_dev_deinit();
  48                 printk(KERN_WARNING "dss1_divert: error %d registering module, not loaded\n", i);
  49                 return (-EIO);
  50         }
  51         printk(KERN_INFO "dss1_divert module successfully installed\n");
  52         return (0);
  53 }
  54
  55 /**********************/
  56 /* Module deinit code */
  57 /**********************/
  58 static void __exit divert_exit(void)
  59 {
  60         unsigned long flags;
  61         int i;
  62
  63         spin_lock_irqsave(&divert_lock, flags);
  64         divert_if.cmd = DIVERT_CMD_REL; /* release */
  65         if ((i = DIVERT_REG_NAME(&divert_if)) != DIVERT_NO_ERR) {
  66                 printk(KERN_WARNING "dss1_divert: error %d releasing module\n", i);
  67                 spin_unlock_irqrestore(&divert_lock, flags);
  68                 return;
  69         }
  70         if (divert_dev_deinit()) {
  71                 printk(KERN_WARNING "dss1_divert: device busy, remove cancelled\n");
  72                 spin_unlock_irqrestore(&divert_lock, flags);
  73                 return;
  74         }
  75         spin_unlock_irqrestore(&divert_lock, flags);
  76         deleterule(-1); /* delete all rules and free mem */
  77         deleteprocs();
  78         printk(KERN_INFO "dss1_divert module successfully removed \n");
  79 }
  80
  81 module_init(divert_init);
  82 module_exit(divert_exit);