net/ieee80211/ieee80211_geo.c

   1 /******************************************************************************
   2
   3   Copyright(c) 2005 Intel Corporation. All rights reserved.
   4
   5   This program is free software; you can redistribute it and/or modify it
   6   under the terms of version 2 of the GNU General Public License as
   7   published by the Free Software Foundation.
   8
   9   This program is distributed in the hope that it will be useful, but WITHOUT
  10   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12   more details.
  13
  14   You should have received a copy of the GNU General Public License along with
  15   this program; if not, write to the Free Software Foundation, Inc., 59
  16   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17
  18   The full GNU General Public License is included in this distribution in the
  19   file called LICENSE.
  20
  21   Contact Information:
  22   James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24
  25 ******************************************************************************/
  26 #include <linux/compiler.h>
  27 #include <linux/config.h>
  28 #include <linux/errno.h>
  29 #include <linux/if_arp.h>
  30 #include <linux/in6.h>
  31 #include <linux/in.h>
  32 #include <linux/ip.h>
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/skbuff.h>
  38 #include <linux/slab.h>
  39 #include <linux/tcp.h>
  40 #include <linux/types.h>
  41 #include <linux/version.h>
  42 #include <linux/wireless.h>
  43 #include <linux/etherdevice.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <net/ieee80211.h>
  47
  48 int ieee80211_is_valid_channel(struct ieee80211_device *ieee, u8 channel)
  49 {
  50         int i;
  51
  52         /* Driver needs to initialize the geography map before using
  53          * these helper functions */
  54         BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
  55
  56         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
  57                 for (i = 0; i < ieee->geo.bg_channels; i++)
  58                         /* NOTE: If G mode is currently supported but
  59                          * this is a B only channel, we don't see it
  60                          * as valid. */
  61                         if ((ieee->geo.bg[i].channel == channel) &&
  62                             (!(ieee->mode & IEEE_G) ||
  63                              !(ieee->geo.bg[i].flags & IEEE80211_CH_B_ONLY)))
  64                                 return IEEE80211_24GHZ_BAND;
  65
  66         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
  67                 for (i = 0; i < ieee->geo.a_channels; i++)
  68                         if (ieee->geo.a[i].channel == channel)
  69                                 return IEEE80211_52GHZ_BAND;
  70
  71         return 0;
  72 }
  73
  74 int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
  75 {
  76         int i;
  77
  78         /* Driver needs to initialize the geography map before using
  79          * these helper functions */
  80         BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
  81
  82         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
  83                 for (i = 0; i < ieee->geo.bg_channels; i++)
  84                         if (ieee->geo.bg[i].channel == channel)
  85                                 return i;
  86
  87         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
  88                 for (i = 0; i < ieee->geo.a_channels; i++)
  89                         if (ieee->geo.a[i].channel == channel)
  90                                 return i;
  91
  92         return -1;
  93 }
  94
  95 u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
  96 {
  97         int i;
  98
  99         /* Driver needs to initialize the geography map before using
 100          * these helper functions */
 101         BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
 102
 103         freq /= 100000;
 104
 105         if (ieee->freq_band & IEEE80211_24GHZ_BAND)
 106                 for (i = 0; i < ieee->geo.bg_channels; i++)
 107                         if (ieee->geo.bg[i].freq == freq)
 108                                 return ieee->geo.bg[i].channel;
 109
 110         if (ieee->freq_band & IEEE80211_52GHZ_BAND)
 111                 for (i = 0; i < ieee->geo.a_channels; i++)
 112                         if (ieee->geo.a[i].freq == freq)
 113                                 return ieee->geo.a[i].channel;
 114
 115         return 0;
 116 }
 117
 118 int ieee80211_set_geo(struct ieee80211_device *ieee,
 119                       const struct ieee80211_geo *geo)
 120 {
 121         memcpy(ieee->geo.name, geo->name, 3);
 122         ieee->geo.name[3] = '\0';
 123         ieee->geo.bg_channels = geo->bg_channels;
 124         ieee->geo.a_channels = geo->a_channels;
 125         memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
 126                sizeof(struct ieee80211_channel));
 127         memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
 128                sizeof(struct ieee80211_channel));
 129         return 0;
 130 }
 131
 132 const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device *ieee)
 133 {
 134         return &ieee->geo;
 135 }
 136
 137 EXPORT_SYMBOL(ieee80211_is_valid_channel);
 138 EXPORT_SYMBOL(ieee80211_freq_to_channel);
 139 EXPORT_SYMBOL(ieee80211_channel_to_index);
 140 EXPORT_SYMBOL(ieee80211_set_geo);
 141 EXPORT_SYMBOL(ieee80211_get_geo);