[PATCH] ieee80211: add ieee80211_channel_to_freq

The routines that interrogate the ieee80211_geo struct are missing a
channel to frequency entry. This patch adds it.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/include/net/ieee80211.h b/include/net/ieee80211.h
index d56b2923d61a..bbd85cd61ed5 100644
--- a/include/net/ieee80211.h
+++ b/include/net/ieee80211.h
@@ -1291,6 +1291,8 @@ extern u8 ieee80211_get_channel_flags(struct ieee80211_device *ieee,
 extern const struct ieee80211_channel *ieee80211_get_channel(struct
                                                              ieee80211_device
                                                              *ieee, u8 channel);
+extern u32 ieee80211_channel_to_freq(struct ieee80211_device * ieee,
+                                      u8 channel);
 
 /* ieee80211_wx.c */
 extern int ieee80211_wx_get_scan(struct ieee80211_device *ieee,
diff --git a/net/ieee80211/ieee80211_geo.c b/net/ieee80211/ieee80211_geo.c
index 305a09de85a5..960ad13f5e9f 100644
--- a/net/ieee80211/ieee80211_geo.c
+++ b/net/ieee80211/ieee80211_geo.c
@@ -94,6 +94,21 @@ int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
         return -1;
 }
 
+u32 ieee80211_channel_to_freq(struct ieee80211_device * ieee, u8 channel)
+{
+        const struct ieee80211_channel * ch;
+
+        /* Driver needs to initialize the geography map before using
+         * these helper functions */
+        if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
+                return 0;
+
+        ch = ieee80211_get_channel(ieee, channel);
+        if (!ch->channel)
+                return 0;
+        return ch->freq;
+}
+
 u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
 {
         int i;
@@ -174,6 +189,7 @@ EXPORT_SYMBOL(ieee80211_get_channel);
 EXPORT_SYMBOL(ieee80211_get_channel_flags);
 EXPORT_SYMBOL(ieee80211_is_valid_channel);
 EXPORT_SYMBOL(ieee80211_freq_to_channel);
+EXPORT_SYMBOL(ieee80211_channel_to_freq);
 EXPORT_SYMBOL(ieee80211_channel_to_index);
 EXPORT_SYMBOL(ieee80211_set_geo);
 EXPORT_SYMBOL(ieee80211_get_geo);