drivers/net/wireless/ipw2x00/libipw_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   Intel Linux Wireless <ilw@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/errno.h>
  28 #include <linux/if_arp.h>
  29 #include <linux/in6.h>
  30 #include <linux/in.h>
  31 #include <linux/ip.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/proc_fs.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/tcp.h>
  38 #include <linux/types.h>
  39 #include <linux/wireless.h>
  40 #include <linux/etherdevice.h>
  41 #include <asm/uaccess.h>
  42
  43 #include "libipw.h"
  44
  45 int libipw_is_valid_channel(struct libipw_device *ieee, u8 channel)
  46 {
  47         int i;
  48
  49         /* Driver needs to initialize the geography map before using
  50          * these helper functions */
  51         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  52                 return 0;
  53
  54         if (ieee->freq_band & LIBIPW_24GHZ_BAND)
  55                 for (i = 0; i < ieee->geo.bg_channels; i++)
  56                         /* NOTE: If G mode is currently supported but
  57                          * this is a B only channel, we don't see it
  58                          * as valid. */
  59                         if ((ieee->geo.bg[i].channel == channel) &&
  60                             !(ieee->geo.bg[i].flags & LIBIPW_CH_INVALID) &&
  61                             (!(ieee->mode & IEEE_G) ||
  62                              !(ieee->geo.bg[i].flags & LIBIPW_CH_B_ONLY)))
  63                                 return LIBIPW_24GHZ_BAND;
  64
  65         if (ieee->freq_band & LIBIPW_52GHZ_BAND)
  66                 for (i = 0; i < ieee->geo.a_channels; i++)
  67                         if ((ieee->geo.a[i].channel == channel) &&
  68                             !(ieee->geo.a[i].flags & LIBIPW_CH_INVALID))
  69                                 return LIBIPW_52GHZ_BAND;
  70
  71         return 0;
  72 }
  73
  74 int libipw_channel_to_index(struct libipw_device *ieee, u8 channel)
  75 {
  76         int i;
  77
  78         /* Driver needs to initialize the geography map before using
  79          * these helper functions */
  80         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  81                 return -1;
  82
  83         if (ieee->freq_band & LIBIPW_24GHZ_BAND)
  84                 for (i = 0; i < ieee->geo.bg_channels; i++)
  85                         if (ieee->geo.bg[i].channel == channel)
  86                                 return i;
  87
  88         if (ieee->freq_band & LIBIPW_52GHZ_BAND)
  89                 for (i = 0; i < ieee->geo.a_channels; i++)
  90                         if (ieee->geo.a[i].channel == channel)
  91                                 return i;
  92
  93         return -1;
  94 }
  95
  96 u32 libipw_channel_to_freq(struct libipw_device * ieee, u8 channel)
  97 {
  98         const struct libipw_channel * ch;
  99
 100         /* Driver needs to initialize the geography map before using
 101          * these helper functions */
 102         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
 103                 return 0;
 104
 105         ch = libipw_get_channel(ieee, channel);
 106         if (!ch->channel)
 107                 return 0;
 108         return ch->freq;
 109 }
 110
 111 u8 libipw_freq_to_channel(struct libipw_device * ieee, u32 freq)
 112 {
 113         int i;
 114
 115         /* Driver needs to initialize the geography map before using
 116          * these helper functions */
 117         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
 118                 return 0;
 119
 120         freq /= 100000;
 121
 122         if (ieee->freq_band & LIBIPW_24GHZ_BAND)
 123                 for (i = 0; i < ieee->geo.bg_channels; i++)
 124                         if (ieee->geo.bg[i].freq == freq)
 125                                 return ieee->geo.bg[i].channel;
 126
 127         if (ieee->freq_band & LIBIPW_52GHZ_BAND)
 128                 for (i = 0; i < ieee->geo.a_channels; i++)
 129                         if (ieee->geo.a[i].freq == freq)
 130                                 return ieee->geo.a[i].channel;
 131
 132         return 0;
 133 }
 134
 135 void libipw_set_geo(struct libipw_device *ieee,
 136                       const struct libipw_geo *geo)
 137 {
 138         memcpy(ieee->geo.name, geo->name, 3);
 139         ieee->geo.name[3] = '\0';
 140         ieee->geo.bg_channels = geo->bg_channels;
 141         ieee->geo.a_channels = geo->a_channels;
 142         memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
 143                sizeof(struct libipw_channel));
 144         memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
 145                sizeof(struct libipw_channel));
 146 }
 147
 148 const struct libipw_geo *libipw_get_geo(struct libipw_device *ieee)
 149 {
 150         return &ieee->geo;
 151 }
 152
 153 u8 libipw_get_channel_flags(struct libipw_device * ieee, u8 channel)
 154 {
 155         int index = libipw_channel_to_index(ieee, channel);
 156
 157         if (index == -1)
 158                 return LIBIPW_CH_INVALID;
 159
 160         if (channel <= LIBIPW_24GHZ_CHANNELS)
 161                 return ieee->geo.bg[index].flags;
 162
 163         return ieee->geo.a[index].flags;
 164 }
 165
 166 static const struct libipw_channel bad_channel = {
 167         .channel = 0,
 168         .flags = LIBIPW_CH_INVALID,
 169         .max_power = 0,
 170 };
 171
 172 const struct libipw_channel *libipw_get_channel(struct libipw_device
 173                                                       *ieee, u8 channel)
 174 {
 175         int index = libipw_channel_to_index(ieee, channel);
 176
 177         if (index == -1)
 178                 return &bad_channel;
 179
 180         if (channel <= LIBIPW_24GHZ_CHANNELS)
 181                 return &ieee->geo.bg[index];
 182
 183         return &ieee->geo.a[index];
 184 }
 185
 186 EXPORT_SYMBOL(libipw_get_channel);
 187 EXPORT_SYMBOL(libipw_get_channel_flags);
 188 EXPORT_SYMBOL(libipw_is_valid_channel);
 189 EXPORT_SYMBOL(libipw_freq_to_channel);
 190 EXPORT_SYMBOL(libipw_channel_to_freq);
 191 EXPORT_SYMBOL(libipw_channel_to_index);
 192 EXPORT_SYMBOL(libipw_set_geo);
 193 EXPORT_SYMBOL(libipw_get_geo);