| Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame^] | 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 != 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 | } |