diff options
Diffstat (limited to 'net/wireless/util.c')
| -rw-r--r-- | net/wireless/util.c | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c index 7620ae2fcf18..4ed065d8bb51 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -29,29 +29,37 @@ ieee80211_get_response_rate(struct ieee80211_supported_band *sband, } EXPORT_SYMBOL(ieee80211_get_response_rate); -int ieee80211_channel_to_frequency(int chan) +int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band) { - if (chan < 14) - return 2407 + chan * 5; - - if (chan == 14) - return 2484; - - /* FIXME: 802.11j 17.3.8.3.2 */ - return (chan + 1000) * 5; + /* see 802.11 17.3.8.3.2 and Annex J + * there are overlapping channel numbers in 5GHz and 2GHz bands */ + if (band == IEEE80211_BAND_5GHZ) { + if (chan >= 182 && chan <= 196) + return 4000 + chan * 5; + else + return 5000 + chan * 5; + } else { /* IEEE80211_BAND_2GHZ */ + if (chan == 14) + return 2484; + else if (chan < 14) + return 2407 + chan * 5; + else + return 0; /* not supported */ + } } EXPORT_SYMBOL(ieee80211_channel_to_frequency); int ieee80211_frequency_to_channel(int freq) { + /* see 802.11 17.3.8.3.2 and Annex J */ if (freq == 2484) return 14; - - if (freq < 2484) + else if (freq < 2484) return (freq - 2407) / 5; - - /* FIXME: 802.11j 17.3.8.3.2 */ - return freq/5 - 1000; + else if (freq >= 4910 && freq <= 4980) + return (freq - 4000) / 5; + else + return (freq - 5000) / 5; } EXPORT_SYMBOL(ieee80211_frequency_to_channel); |