package/mac80211/src/net/wireless/util.c

   1 /*
   2  * Wireless utility functions
   3  *
   4  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   5  */
   6 #include <net/wireless.h>
   7 #include <asm/bitops.h>
   8 #include "core.h"
   9
  10 int ieee80211_channel_to_frequency(int chan)
  11 {
  12         if (chan < 14)
  13                 return 2407 + chan * 5;
  14
  15         if (chan == 14)
  16                 return 2484;
  17
  18         /* FIXME: 802.11j 17.3.8.3.2 */
  19         return (chan + 1000) * 5;
  20 }
  21 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  22
  23 int ieee80211_frequency_to_channel(int freq)
  24 {
  25         if (freq == 2484)
  26                 return 14;
  27
  28         if (freq < 2484)
  29                 return (freq - 2407) / 5;
  30
  31         /* FIXME: 802.11j 17.3.8.3.2 */
  32         return freq/5 - 1000;
  33 }
  34 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
  35
  36 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
  37                                      enum ieee80211_band band)
  38 {
  39         int i, want;
  40
  41         switch (band) {
  42         case IEEE80211_BAND_5GHZ:
  43                 want = 3;
  44                 for (i = 0; i < sband->n_bitrates; i++) {
  45                         if (sband->bitrates[i].bitrate == 60 ||
  46                             sband->bitrates[i].bitrate == 120 ||
  47                             sband->bitrates[i].bitrate == 240) {
  48                                 sband->bitrates[i].flags |=
  49                                         IEEE80211_RATE_MANDATORY_A;
  50                                 want--;
  51                         }
  52                 }
  53                 WARN_ON(want);
  54                 break;
  55         case IEEE80211_BAND_2GHZ:
  56                 want = 7;
  57                 for (i = 0; i < sband->n_bitrates; i++) {
  58                         if (sband->bitrates[i].bitrate == 10) {
  59                                 sband->bitrates[i].flags |=
  60                                         IEEE80211_RATE_MANDATORY_B |
  61                                         IEEE80211_RATE_MANDATORY_G;
  62                                 want--;
  63                         }
  64
  65                         if (sband->bitrates[i].bitrate == 20 ||
  66                             sband->bitrates[i].bitrate == 55 ||
  67                             sband->bitrates[i].bitrate == 110 ||
  68                             sband->bitrates[i].bitrate == 60 ||
  69                             sband->bitrates[i].bitrate == 120 ||
  70                             sband->bitrates[i].bitrate == 240) {
  71                                 sband->bitrates[i].flags |=
  72                                         IEEE80211_RATE_MANDATORY_G;
  73                                 want--;
  74                         }
  75
  76                         if (sband->bitrates[i].bitrate != 10 &&
  77                             sband->bitrates[i].bitrate != 20 &&
  78                             sband->bitrates[i].bitrate != 55 &&
  79                             sband->bitrates[i].bitrate != 110)
  80                                 sband->bitrates[i].flags |=
  81                                         IEEE80211_RATE_ERP_G;
  82                 }
  83                 WARN_ON(want != 0 && want != 3 && want != 6);
  84                 break;
  85         case IEEE80211_NUM_BANDS:
  86                 WARN_ON(1);
  87                 break;
  88         }
  89 }
  90
  91 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
  92 {
  93         enum ieee80211_band band;
  94
  95         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
  96                 if (wiphy->bands[band])
  97                         set_mandatory_flags_band(wiphy->bands[band], band);
  98 }