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ipv4: replace dst_metric() with dst_mtu() in net/ipv4/route.c.
[linux-2.6] / 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 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
37                                                   int freq)
38 {
39         enum ieee80211_band band;
40         struct ieee80211_supported_band *sband;
41         int i;
42
43         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
44                 sband = wiphy->bands[band];
45
46                 if (!sband)
47                         continue;
48
49                 for (i = 0; i < sband->n_channels; i++) {
50                         if (sband->channels[i].center_freq == freq)
51                                 return &sband->channels[i];
52                 }
53         }
54
55         return NULL;
56 }
57 EXPORT_SYMBOL(__ieee80211_get_channel);
58
59 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
60                                      enum ieee80211_band band)
61 {
62         int i, want;
63
64         switch (band) {
65         case IEEE80211_BAND_5GHZ:
66                 want = 3;
67                 for (i = 0; i < sband->n_bitrates; i++) {
68                         if (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_A;
73                                 want--;
74                         }
75                 }
76                 WARN_ON(want);
77                 break;
78         case IEEE80211_BAND_2GHZ:
79                 want = 7;
80                 for (i = 0; i < sband->n_bitrates; i++) {
81                         if (sband->bitrates[i].bitrate == 10) {
82                                 sband->bitrates[i].flags |=
83                                         IEEE80211_RATE_MANDATORY_B |
84                                         IEEE80211_RATE_MANDATORY_G;
85                                 want--;
86                         }
87
88                         if (sband->bitrates[i].bitrate == 20 ||
89                             sband->bitrates[i].bitrate == 55 ||
90                             sband->bitrates[i].bitrate == 110 ||
91                             sband->bitrates[i].bitrate == 60 ||
92                             sband->bitrates[i].bitrate == 120 ||
93                             sband->bitrates[i].bitrate == 240) {
94                                 sband->bitrates[i].flags |=
95                                         IEEE80211_RATE_MANDATORY_G;
96                                 want--;
97                         }
98
99                         if (sband->bitrates[i].bitrate != 10 &&
100                             sband->bitrates[i].bitrate != 20 &&
101                             sband->bitrates[i].bitrate != 55 &&
102                             sband->bitrates[i].bitrate != 110)
103                                 sband->bitrates[i].flags |=
104                                         IEEE80211_RATE_ERP_G;
105                 }
106                 WARN_ON(want != 0 && want != 3 && want != 6);
107                 break;
108         case IEEE80211_NUM_BANDS:
109                 WARN_ON(1);
110                 break;
111         }
112 }
113
114 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
115 {
116         enum ieee80211_band band;
117
118         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
119                 if (wiphy->bands[band])
120                         set_mandatory_flags_band(wiphy->bands[band], band);
121 }