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 { int i;
  40
  41         if (divert_dev_init())
  42         { printk(KERN_WARNING "dss1_divert: cannot install device, not loaded\n");
  43                 return (-EIO);
  44         }
  45         if ((i = DIVERT_REG_NAME(&divert_if)) != DIVERT_NO_ERR)
  46         { divert_dev_deinit();
  47                 printk(KERN_WARNING "dss1_divert: error %d registering module, not loaded\n", i);
  48                 return (-EIO);
  49         }
  50         printk(KERN_INFO "dss1_divert module successfully installed\n");
  51         return (0);
  52 }
  53
  54 /**********************/
  55 /* Module deinit code */
  56 /**********************/
  57 static void __exit divert_exit(void)
  58 {
  59         unsigned long flags;
  60         int i;
  61
  62         spin_lock_irqsave(&divert_lock, flags);
  63         divert_if.cmd = DIVERT_CMD_REL; /* release */
  64         if ((i = DIVERT_REG_NAME(&divert_if)) != DIVERT_NO_ERR)
  65         { printk(KERN_WARNING "dss1_divert: error %d releasing module\n", i);
  66                 spin_unlock_irqrestore(&divert_lock, flags);
  67                 return;
  68         }
  69         if (divert_dev_deinit())
  70         { printk(KERN_WARNING "dss1_divert: device busy, remove cancelled\n");
  71                 spin_unlock_irqrestore(&divert_lock, flags);
  72                 return;
  73         }
  74         spin_unlock_irqrestore(&divert_lock, flags);
  75         deleterule(-1); /* delete all rules and free mem */
  76         deleteprocs();
  77         printk(KERN_INFO "dss1_divert module successfully removed \n");
  78 }
  79
  80 module_init(divert_init);
  81 module_exit(divert_exit);