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>

1 files changed, 23 insertions, 0 deletions

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 77336c22fcf2..f3e623df3515 100644
--- 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)
 {