1 files changed, 121 insertions, 0 deletions

diff --git a/net/wireless/util.c b/net/wireless/util.c
new file mode 100644
index 000000000000..f54424693a38
--- /dev/null
+++ b/net/wireless/util.c
@@ -0,0 +1,121 @@
+/*
+ * Wireless utility functions
+ *
+ * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
+ */
+#include <net/wireless.h>
+#include <asm/bitops.h>
+#include "core.h"
+
+int ieee80211_channel_to_frequency(int chan)
+{
+        if (chan < 14)
+                return 2407 + chan * 5;
+
+        if (chan == 14)
+                return 2484;
+
+        /* FIXME: 802.11j 17.3.8.3.2 */
+        return (chan + 1000) * 5;
+}
+EXPORT_SYMBOL(ieee80211_channel_to_frequency);
+
+int ieee80211_frequency_to_channel(int freq)
+{
+        if (freq == 2484)
+                return 14;
+
+        if (freq < 2484)
+                return (freq - 2407) / 5;
+
+        /* FIXME: 802.11j 17.3.8.3.2 */
+        return freq/5 - 1000;
+}
+EXPORT_SYMBOL(ieee80211_frequency_to_channel);
+
+struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
+                                                  int freq)
+{
+        enum ieee80211_band band;
+        struct ieee80211_supported_band *sband;
+        int i;
+
+        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+                sband = wiphy->bands[band];
+
+                if (!sband)
+                        continue;
+
+                for (i = 0; i < sband->n_channels; i++) {
+                        if (sband->channels[i].center_freq == freq)
+                                return &sband->channels[i];
+                }
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL(__ieee80211_get_channel);
+
+static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
+                                     enum ieee80211_band band)
+{
+        int i, want;
+
+        switch (band) {
+        case IEEE80211_BAND_5GHZ:
+                want = 3;
+                for (i = 0; i < sband->n_bitrates; i++) {
+                        if (sband->bitrates[i].bitrate == 60 ||
+                            sband->bitrates[i].bitrate == 120 ||
+                            sband->bitrates[i].bitrate == 240) {
+                                sband->bitrates[i].flags |=
+                                        IEEE80211_RATE_MANDATORY_A;
+                                want--;
+                        }
+                }
+                WARN_ON(want);
+                break;
+        case IEEE80211_BAND_2GHZ:
+                want = 7;
+                for (i = 0; i < sband->n_bitrates; i++) {
+                        if (sband->bitrates[i].bitrate == 10) {
+                                sband->bitrates[i].flags |=
+                                        IEEE80211_RATE_MANDATORY_B |
+                                        IEEE80211_RATE_MANDATORY_G;
+                                want--;
+                        }
+
+                        if (sband->bitrates[i].bitrate == 20 ||
+                            sband->bitrates[i].bitrate == 55 ||
+                            sband->bitrates[i].bitrate == 110 ||
+                            sband->bitrates[i].bitrate == 60 ||
+                            sband->bitrates[i].bitrate == 120 ||
+                            sband->bitrates[i].bitrate == 240) {
+                                sband->bitrates[i].flags |=
+                                        IEEE80211_RATE_MANDATORY_G;
+                                want--;
+                        }
+
+                        if (sband->bitrates[i].bitrate != 10 &&
+                            sband->bitrates[i].bitrate != 20 &&
+                            sband->bitrates[i].bitrate != 55 &&
+                            sband->bitrates[i].bitrate != 110)
+                                sband->bitrates[i].flags |=
+                                        IEEE80211_RATE_ERP_G;
+                }
+                WARN_ON(want != 0 && want != 3 && want != 6);
+                break;
+        case IEEE80211_NUM_BANDS:
+                WARN_ON(1);
+                break;
+        }
+}
+
+void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
+{
+        enum ieee80211_band band;
+
+        for (band = 0; band < IEEE80211_NUM_BANDS; band++)
+                if (wiphy->bands[band])
+                        set_mandatory_flags_band(wiphy->bands[band], band);
+}