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When the driver registers a IEEE80211_BAND_2GHZ band, it can either be 802.11b or 802.11g. But when 802.11b rates are registered "want" will be 3 (since 4 rates are being registered, and each of those 4 rates will decrease "want"). Since this is a correct situation, there is no need to trigger a WARN_ON() for this. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
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* Wireless utility functions
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*
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <net/wireless.h>
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#include <asm/bitops.h>
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#include "core.h"
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int ieee80211_channel_to_frequency(int chan)
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{
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if (chan < 14)
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return 2407 + chan * 5;
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if (chan == 14)
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return 2484;
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/* FIXME: 802.11j 17.3.8.3.2 */
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return (chan + 1000) * 5;
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}
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EXPORT_SYMBOL(ieee80211_channel_to_frequency);
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int ieee80211_frequency_to_channel(int freq)
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{
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if (freq == 2484)
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return 14;
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if (freq < 2484)
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return (freq - 2407) / 5;
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/* FIXME: 802.11j 17.3.8.3.2 */
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return freq/5 - 1000;
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}
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EXPORT_SYMBOL(ieee80211_frequency_to_channel);
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static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
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enum ieee80211_band band)
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{
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int i, want;
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switch (band) {
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case IEEE80211_BAND_5GHZ:
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want = 3;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].bitrate == 60 ||
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sband->bitrates[i].bitrate == 120 ||
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sband->bitrates[i].bitrate == 240) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_A;
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want--;
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}
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}
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WARN_ON(want);
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break;
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case IEEE80211_BAND_2GHZ:
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want = 7;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].bitrate == 10) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_B |
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IEEE80211_RATE_MANDATORY_G;
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want--;
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}
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if (sband->bitrates[i].bitrate == 20 ||
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sband->bitrates[i].bitrate == 55 ||
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sband->bitrates[i].bitrate == 110 ||
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sband->bitrates[i].bitrate == 60 ||
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sband->bitrates[i].bitrate == 120 ||
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sband->bitrates[i].bitrate == 240) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_G;
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want--;
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}
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if (sband->bitrates[i].bitrate != 10 &&
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sband->bitrates[i].bitrate != 20 &&
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sband->bitrates[i].bitrate != 55 &&
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sband->bitrates[i].bitrate != 110)
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sband->bitrates[i].flags |=
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IEEE80211_RATE_ERP_G;
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}
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WARN_ON(want != 0 && want != 3 && want != 6);
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break;
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case IEEE80211_NUM_BANDS:
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WARN_ON(1);
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break;
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}
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}
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void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
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{
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enum ieee80211_band band;
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for (band = 0; band < IEEE80211_NUM_BANDS; band++)
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if (wiphy->bands[band])
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set_mandatory_flags_band(wiphy->bands[band], band);
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}
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