drivers/net/wireless/intel/ipw2x00/libipw_geo.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3
   4   Copyright(c) 2005 Intel Corporation. All rights reserved.
   5
   6
   7   Contact Information:
   8   Intel Linux Wireless <ilw@linux.intel.com>
   9   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  10
  11 ******************************************************************************/
  12 #include <linux/compiler.h>
  13 #include <linux/errno.h>
  14 #include <linux/if_arp.h>
  15 #include <linux/in6.h>
  16 #include <linux/in.h>
  17 #include <linux/ip.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/tcp.h>
  24 #include <linux/types.h>
  25 #include <linux/wireless.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/uaccess.h>
  28
  29 #include "libipw.h"
  30
  31 int libipw_is_valid_channel(struct libipw_device *ieee, u8 channel)
  32 {
  33         int i;
  34
  35         /* Driver needs to initialize the geography map before using
  36          * these helper functions */
  37         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  38                 return 0;
  39
  40         if (ieee->freq_band & LIBIPW_24GHZ_BAND)
  41                 for (i = 0; i < ieee->geo.bg_channels; i++)
  42                         /* NOTE: If G mode is currently supported but
  43                          * this is a B only channel, we don't see it
  44                          * as valid. */
  45                         if ((ieee->geo.bg[i].channel == channel) &&
  46                             !(ieee->geo.bg[i].flags & LIBIPW_CH_INVALID) &&
  47                             (!(ieee->mode & IEEE_G) ||
  48                              !(ieee->geo.bg[i].flags & LIBIPW_CH_B_ONLY)))
  49                                 return LIBIPW_24GHZ_BAND;
  50
  51         if (ieee->freq_band & LIBIPW_52GHZ_BAND)
  52                 for (i = 0; i < ieee->geo.a_channels; i++)
  53                         if ((ieee->geo.a[i].channel == channel) &&
  54                             !(ieee->geo.a[i].flags & LIBIPW_CH_INVALID))
  55                                 return LIBIPW_52GHZ_BAND;
  56
  57         return 0;
  58 }
  59
  60 int libipw_channel_to_index(struct libipw_device *ieee, u8 channel)
  61 {
  62         int i;
  63
  64         /* Driver needs to initialize the geography map before using
  65          * these helper functions */
  66         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  67                 return -1;
  68
  69         if (ieee->freq_band & LIBIPW_24GHZ_BAND)
  70                 for (i = 0; i < ieee->geo.bg_channels; i++)
  71                         if (ieee->geo.bg[i].channel == channel)
  72                                 return i;
  73
  74         if (ieee->freq_band & LIBIPW_52GHZ_BAND)
  75                 for (i = 0; i < ieee->geo.a_channels; i++)
  76                         if (ieee->geo.a[i].channel == channel)
  77                                 return i;
  78
  79         return -1;
  80 }
  81
  82 u32 libipw_channel_to_freq(struct libipw_device * ieee, u8 channel)
  83 {
  84         const struct libipw_channel * ch;
  85
  86         /* Driver needs to initialize the geography map before using
  87          * these helper functions */
  88         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
  89                 return 0;
  90
  91         ch = libipw_get_channel(ieee, channel);
  92         if (!ch->channel)
  93                 return 0;
  94         return ch->freq;
  95 }
  96
  97 u8 libipw_freq_to_channel(struct libipw_device * ieee, u32 freq)
  98 {
  99         int i;
 100
 101         /* Driver needs to initialize the geography map before using
 102          * these helper functions */
 103         if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
 104                 return 0;
 105
 106         freq /= 100000;
 107
 108         if (ieee->freq_band & LIBIPW_24GHZ_BAND)
 109                 for (i = 0; i < ieee->geo.bg_channels; i++)
 110                         if (ieee->geo.bg[i].freq == freq)
 111                                 return ieee->geo.bg[i].channel;
 112
 113         if (ieee->freq_band & LIBIPW_52GHZ_BAND)
 114                 for (i = 0; i < ieee->geo.a_channels; i++)
 115                         if (ieee->geo.a[i].freq == freq)
 116                                 return ieee->geo.a[i].channel;
 117
 118         return 0;
 119 }
 120
 121 void libipw_set_geo(struct libipw_device *ieee,
 122                       const struct libipw_geo *geo)
 123 {
 124         memcpy(ieee->geo.name, geo->name, 3);
 125         ieee->geo.name[3] = '\0';
 126         ieee->geo.bg_channels = geo->bg_channels;
 127         ieee->geo.a_channels = geo->a_channels;
 128         memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
 129                sizeof(struct libipw_channel));
 130         memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
 131                sizeof(struct libipw_channel));
 132 }
 133
 134 const struct libipw_geo *libipw_get_geo(struct libipw_device *ieee)
 135 {
 136         return &ieee->geo;
 137 }
 138
 139 u8 libipw_get_channel_flags(struct libipw_device * ieee, u8 channel)
 140 {
 141         int index = libipw_channel_to_index(ieee, channel);
 142
 143         if (index == -1)
 144                 return LIBIPW_CH_INVALID;
 145
 146         if (channel <= LIBIPW_24GHZ_CHANNELS)
 147                 return ieee->geo.bg[index].flags;
 148
 149         return ieee->geo.a[index].flags;
 150 }
 151
 152 static const struct libipw_channel bad_channel = {
 153         .channel = 0,
 154         .flags = LIBIPW_CH_INVALID,
 155         .max_power = 0,
 156 };
 157
 158 const struct libipw_channel *libipw_get_channel(struct libipw_device
 159                                                       *ieee, u8 channel)
 160 {
 161         int index = libipw_channel_to_index(ieee, channel);
 162
 163         if (index == -1)
 164                 return &bad_channel;
 165
 166         if (channel <= LIBIPW_24GHZ_CHANNELS)
 167                 return &ieee->geo.bg[index];
 168
 169         return &ieee->geo.a[index];
 170 }
 171
 172 EXPORT_SYMBOL(libipw_get_channel);
 173 EXPORT_SYMBOL(libipw_get_channel_flags);
 174 EXPORT_SYMBOL(libipw_is_valid_channel);
 175 EXPORT_SYMBOL(libipw_freq_to_channel);
 176 EXPORT_SYMBOL(libipw_channel_to_freq);
 177 EXPORT_SYMBOL(libipw_channel_to_index);
 178 EXPORT_SYMBOL(libipw_set_geo);
 179 EXPORT_SYMBOL(libipw_get_geo);