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Johannes Berg8318d782008-01-24 19:38:38 +01001/*
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
10int 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}
21EXPORT_SYMBOL(ieee80211_channel_to_frequency);
22
23int 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}
34EXPORT_SYMBOL(ieee80211_frequency_to_channel);
35
36static 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 != 6);
84 break;
85 case IEEE80211_NUM_BANDS:
86 WARN_ON(1);
87 break;
88 }
89}
90
91void 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}