From: Johannes Berg <johannes@sipsolutions.net>
Date: Sun, 16 Mar 2008 17:34:33 +0000 (+0100)
Subject: wireless: add wiphy channel freq to channel struct lookup helper
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=906c730a2db950b7bce4ef17d65399acd791c360;p=openwrt%2Fstaging%2Fblogic.git

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 c7f805ee5545..f4b77ab66bae 100644
--- 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 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)
 {