LXR linux/drivers/net/wireless/ipw2x00/libipw

   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
  45int 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
  74int 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
  96u32 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
 111u8 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
 135void 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
 148const struct libipw_geo *libipw_get_geo(struct libipw_device *ieee)
 149{
 150        return &ieee->geo;
 151}
 152
 153u8 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
 166static const struct libipw_channel bad_channel = {
 167        .channel = 0,
 168        .flags = LIBIPW_CH_INVALID,
 169        .max_power = 0,
 170};
 171
 172const 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
 186EXPORT_SYMBOL(libipw_get_channel);
 187EXPORT_SYMBOL(libipw_get_channel_flags);
 188EXPORT_SYMBOL(libipw_is_valid_channel);
 189EXPORT_SYMBOL(libipw_freq_to_channel);
 190EXPORT_SYMBOL(libipw_channel_to_freq);
 191EXPORT_SYMBOL(libipw_channel_to_index);
 192EXPORT_SYMBOL(libipw_set_geo);
 193EXPORT_SYMBOL(libipw_get_geo);
 194