]>
Commit | Line | Data |
---|---|---|
8318d78a JB |
1 | /* |
2 | * Wireless utility functions | |
3 | * | |
d3236553 | 4 | * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net> |
8318d78a | 5 | */ |
d3236553 JB |
6 | #include <linux/bitops.h> |
7 | #include <net/cfg80211.h> | |
8318d78a JB |
8 | #include "core.h" |
9 | ||
bd815252 JB |
10 | struct ieee80211_rate * |
11 | ieee80211_get_response_rate(struct ieee80211_supported_band *sband, | |
881d948c | 12 | u32 basic_rates, int bitrate) |
bd815252 JB |
13 | { |
14 | struct ieee80211_rate *result = &sband->bitrates[0]; | |
15 | int i; | |
16 | ||
17 | for (i = 0; i < sband->n_bitrates; i++) { | |
18 | if (!(basic_rates & BIT(i))) | |
19 | continue; | |
20 | if (sband->bitrates[i].bitrate > bitrate) | |
21 | continue; | |
22 | result = &sband->bitrates[i]; | |
23 | } | |
24 | ||
25 | return result; | |
26 | } | |
27 | EXPORT_SYMBOL(ieee80211_get_response_rate); | |
28 | ||
8318d78a JB |
29 | int ieee80211_channel_to_frequency(int chan) |
30 | { | |
31 | if (chan < 14) | |
32 | return 2407 + chan * 5; | |
33 | ||
34 | if (chan == 14) | |
35 | return 2484; | |
36 | ||
37 | /* FIXME: 802.11j 17.3.8.3.2 */ | |
38 | return (chan + 1000) * 5; | |
39 | } | |
40 | EXPORT_SYMBOL(ieee80211_channel_to_frequency); | |
41 | ||
42 | int ieee80211_frequency_to_channel(int freq) | |
43 | { | |
44 | if (freq == 2484) | |
45 | return 14; | |
46 | ||
47 | if (freq < 2484) | |
48 | return (freq - 2407) / 5; | |
49 | ||
50 | /* FIXME: 802.11j 17.3.8.3.2 */ | |
51 | return freq/5 - 1000; | |
52 | } | |
53 | EXPORT_SYMBOL(ieee80211_frequency_to_channel); | |
54 | ||
6c507cd0 JB |
55 | struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, |
56 | int freq) | |
906c730a JB |
57 | { |
58 | enum ieee80211_band band; | |
59 | struct ieee80211_supported_band *sband; | |
60 | int i; | |
61 | ||
62 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
63 | sband = wiphy->bands[band]; | |
64 | ||
65 | if (!sband) | |
66 | continue; | |
67 | ||
68 | for (i = 0; i < sband->n_channels; i++) { | |
69 | if (sband->channels[i].center_freq == freq) | |
70 | return &sband->channels[i]; | |
71 | } | |
72 | } | |
73 | ||
74 | return NULL; | |
75 | } | |
6c507cd0 | 76 | EXPORT_SYMBOL(__ieee80211_get_channel); |
906c730a | 77 | |
8318d78a JB |
78 | static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, |
79 | enum ieee80211_band band) | |
80 | { | |
81 | int i, want; | |
82 | ||
83 | switch (band) { | |
84 | case IEEE80211_BAND_5GHZ: | |
85 | want = 3; | |
86 | for (i = 0; i < sband->n_bitrates; i++) { | |
87 | if (sband->bitrates[i].bitrate == 60 || | |
88 | sband->bitrates[i].bitrate == 120 || | |
89 | sband->bitrates[i].bitrate == 240) { | |
90 | sband->bitrates[i].flags |= | |
91 | IEEE80211_RATE_MANDATORY_A; | |
92 | want--; | |
93 | } | |
94 | } | |
95 | WARN_ON(want); | |
96 | break; | |
97 | case IEEE80211_BAND_2GHZ: | |
98 | want = 7; | |
99 | for (i = 0; i < sband->n_bitrates; i++) { | |
100 | if (sband->bitrates[i].bitrate == 10) { | |
101 | sband->bitrates[i].flags |= | |
102 | IEEE80211_RATE_MANDATORY_B | | |
103 | IEEE80211_RATE_MANDATORY_G; | |
104 | want--; | |
105 | } | |
106 | ||
107 | if (sband->bitrates[i].bitrate == 20 || | |
108 | sband->bitrates[i].bitrate == 55 || | |
109 | sband->bitrates[i].bitrate == 110 || | |
110 | sband->bitrates[i].bitrate == 60 || | |
111 | sband->bitrates[i].bitrate == 120 || | |
112 | sband->bitrates[i].bitrate == 240) { | |
113 | sband->bitrates[i].flags |= | |
114 | IEEE80211_RATE_MANDATORY_G; | |
115 | want--; | |
116 | } | |
117 | ||
aac09fbf JB |
118 | if (sband->bitrates[i].bitrate != 10 && |
119 | sband->bitrates[i].bitrate != 20 && | |
120 | sband->bitrates[i].bitrate != 55 && | |
121 | sband->bitrates[i].bitrate != 110) | |
8318d78a JB |
122 | sband->bitrates[i].flags |= |
123 | IEEE80211_RATE_ERP_G; | |
124 | } | |
406f2388 | 125 | WARN_ON(want != 0 && want != 3 && want != 6); |
8318d78a JB |
126 | break; |
127 | case IEEE80211_NUM_BANDS: | |
128 | WARN_ON(1); | |
129 | break; | |
130 | } | |
131 | } | |
132 | ||
133 | void ieee80211_set_bitrate_flags(struct wiphy *wiphy) | |
134 | { | |
135 | enum ieee80211_band band; | |
136 | ||
137 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
138 | if (wiphy->bands[band]) | |
139 | set_mandatory_flags_band(wiphy->bands[band], band); | |
140 | } |