drivers/staging/dgrp/dgrp_driver.c

   1 /*
   2  *
   3  * Copyright 1999-2003 Digi International (www.digi.com)
   4  *     Jeff Randall
   5  *     James Puzzo  <jamesp at digi dot com>
   6  *     Scott Kilau  <Scott_Kilau at digi dot com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
  15  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  16  * PURPOSE.  See the GNU General Public License for more details.
  17  *
  18  */
  19
  20 /*
  21  *      Driver specific includes
  22  */
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/tty.h>
  26 #include <linux/init.h>
  27
  28 /*
  29  *  PortServer includes
  30  */
  31 #include "dgrp_common.h"
  32
  33
  34 MODULE_LICENSE("GPL");
  35 MODULE_AUTHOR("Digi International, http://www.digi.com");
  36 MODULE_DESCRIPTION("RealPort driver for Digi's ethernet-based serial connectivity product line");
  37 MODULE_VERSION(DIGI_VERSION);
  38
  39 struct list_head nd_struct_list;
  40 struct dgrp_poll_data dgrp_poll_data;
  41
  42 int dgrp_register_cudevices = 1;/* Turn on/off registering legacy cu devices */
  43 int dgrp_register_prdevices = 1;/* Turn on/off registering transparent print */
  44 int dgrp_poll_tick = 20;        /* Poll interval - in ms */
  45
  46 module_param_named(register_cudevices, dgrp_register_cudevices, int, 0644);
  47 MODULE_PARM_DESC(register_cudevices, "Turn on/off registering legacy cu devices");
  48
  49 module_param_named(register_prdevices, dgrp_register_prdevices, int, 0644);
  50 MODULE_PARM_DESC(register_prdevices, "Turn on/off registering transparent print devices");
  51
  52 module_param_named(pollrate, dgrp_poll_tick, int, 0644);
  53 MODULE_PARM_DESC(pollrate, "Poll interval in ms");
  54
  55 /* Driver load/unload functions */
  56 static int dgrp_init_module(void);
  57 static void dgrp_cleanup_module(void);
  58
  59 module_init(dgrp_init_module);
  60 module_exit(dgrp_cleanup_module);
  61
  62 /*
  63  * init_module()
  64  *
  65  * Module load.  This is where it all starts.
  66  */
  67 static int dgrp_init_module(void)
  68 {
  69         int ret;
  70
  71         INIT_LIST_HEAD(&nd_struct_list);
  72
  73         spin_lock_init(&dgrp_poll_data.poll_lock);
  74         init_timer(&dgrp_poll_data.timer);
  75         dgrp_poll_data.poll_tick = dgrp_poll_tick;
  76         dgrp_poll_data.timer.function = dgrp_poll_handler;
  77         dgrp_poll_data.timer.data = (unsigned long) &dgrp_poll_data;
  78
  79         ret = dgrp_create_class_sysfs_files();
  80         if (ret)
  81                 return ret;
  82
  83         dgrp_register_proc();
  84
  85         return 0;
  86 }
  87
  88
  89 /*
  90  *      Module unload.  This is where it all ends.
  91  */
  92 static void dgrp_cleanup_module(void)
  93 {
  94         struct nd_struct *nd, *next;
  95
  96         /*
  97          *      Attempting to free resources in backwards
  98          *      order of allocation, in case that helps
  99          *      memory pool fragmentation.
 100          */
 101         dgrp_unregister_proc();
 102
 103         dgrp_remove_class_sysfs_files();
 104
 105
 106         list_for_each_entry_safe(nd, next, &nd_struct_list, list) {
 107                 dgrp_tty_uninit(nd);
 108                 kfree(nd);
 109         }
 110 }