package/d80211/src/ieee80211_dev.c

   1 /*
   2  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/if.h>
  12 #include <linux/if_ether.h>
  13 #include <linux/netdevice.h>
  14 #include <net/d80211.h>
  15 #include "ieee80211_i.h"
  16 #include "ieee80211_led.h"
  17
  18 struct ieee80211_dev_list {
  19         struct list_head list;
  20         int dev_index;
  21         struct ieee80211_local *local;
  22 };
  23
  24 static LIST_HEAD(dev_list);
  25 static DEFINE_SPINLOCK(dev_list_lock);
  26
  27
  28 /* Caller must hold dev_list_lock */
  29 static struct ieee80211_dev_list *__ieee80211_dev_find(int index)
  30 {
  31         struct ieee80211_dev_list *dev_item;
  32
  33         list_for_each_entry(dev_item, &dev_list, list) {
  34                 if (dev_item->dev_index == index)
  35                         return dev_item;
  36         }
  37         return NULL;
  38 }
  39
  40 int ieee80211_dev_alloc_index(struct ieee80211_local *local)
  41 {
  42         struct ieee80211_dev_list *dev_item, *new;
  43         int index = 0;
  44
  45         new = kmalloc(sizeof(struct ieee80211_dev_list), GFP_KERNEL);
  46         if (!new)
  47                 return -ENOMEM;
  48         new->local = local;
  49         spin_lock(&dev_list_lock);
  50         list_for_each_entry(dev_item, &dev_list, list) {
  51                 if (index < dev_item->dev_index)
  52                         break;
  53                 index++;
  54         }
  55         new->dev_index = index;
  56         list_add_tail(&new->list, &dev_item->list);
  57         spin_unlock(&dev_list_lock);
  58         local->hw.index = index;
  59         return index;
  60 }
  61
  62 void ieee80211_dev_free_index(struct ieee80211_local *local)
  63 {
  64         struct ieee80211_dev_list *dev_item;
  65
  66         spin_lock(&dev_list_lock);
  67         dev_item = __ieee80211_dev_find(local->hw.index);
  68         if (dev_item)
  69                 list_del(&dev_item->list);
  70         spin_unlock(&dev_list_lock);
  71         if (dev_item)
  72                 kfree(dev_item);
  73         local->hw.index = -1;
  74 }
  75
  76 struct ieee80211_local *ieee80211_dev_find(int index)
  77 {
  78         struct ieee80211_dev_list *dev_item;
  79
  80         spin_lock(&dev_list_lock);
  81         dev_item = __ieee80211_dev_find(index);
  82         spin_unlock(&dev_list_lock);
  83         return dev_item ? dev_item->local : NULL;
  84 }
  85
  86 int ieee80211_dev_find_index(struct ieee80211_local *local)
  87 {
  88         struct ieee80211_dev_list *dev_item;
  89         int index = -1;
  90
  91         spin_lock(&dev_list_lock);
  92         list_for_each_entry(dev_item, &dev_list, list) {
  93                 if (dev_item->local == local) {
  94                         index = dev_item->dev_index;
  95                         break;
  96                 }
  97         }
  98         spin_unlock(&dev_list_lock);
  99         return index;
 100 }
 101
 102 struct ieee80211_local *ieee80211_dev_alloc(gfp_t flags)
 103 {
 104         struct ieee80211_local *local;
 105
 106         local = kzalloc(sizeof(struct ieee80211_local), flags);
 107         if (!local)
 108                 return NULL;
 109         local->hw.index = -1;
 110         ieee80211_dev_sysfs_init(local);
 111         return local;
 112 }
 113
 114 void ieee80211_dev_free(struct ieee80211_local *local)
 115 {
 116         ieee80211_dev_sysfs_put(local);
 117 }