wireless: add wiphy channel freq to channel struct lookup helper

Add ieee80211_get_channel() which gets you a channel struct for a
specific wiphy if that channel is present in that wiphy.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/net/wireless.h b/include/net/wireless.h
index c7f805e..f4b77ab 100644 (file)
--- a/include/net/wireless.h
+++ b/include/net/wireless.h
@@ -304,4 +304,10 @@ extern int ieee80211_channel_to_frequency(int chan);
  */
 extern int ieee80211_frequency_to_channel(int freq);
 
+/**
+ * ieee80211_get_channel - get channel struct from wiphy for specified frequency
+ */
+extern struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy,
+                                                      int freq);
+
 #endif /* __NET_WIRELESS_H */

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 77336c2..f3e623d 100644 (file)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -33,6 +33,29 @@ int ieee80211_frequency_to_channel(int freq)
 }
 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)
 {