cfg80211: add ieee80211_operating_class_to_band

This function converts a (global only!) operating
class to an internal band identifier. This will
be needed for extended channel switch support.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 31 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 57870b646974..dff96d8cafcd 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -4024,6 +4024,17 @@ bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
 void cfg80211_ch_switch_notify(struct net_device *dev,
                                struct cfg80211_chan_def *chandef);
 
+/**
+ * ieee80211_operating_class_to_band - convert operating class to band
+ *
+ * @operating_class: the operating class to convert
+ * @band: band pointer to fill
+ *
+ * Returns %true if the conversion was successful, %false otherwise.
+ */
+bool ieee80211_operating_class_to_band(u8 operating_class,
+                                       enum ieee80211_band *band);
+
 /*
  * cfg80211_tdls_oper_request - request userspace to perform TDLS operation
  * @dev: the device on which the operation is requested
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 37a56ee1e1ed..3d8a1334f4a9 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1155,6 +1155,26 @@ int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
 }
 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
 
+bool ieee80211_operating_class_to_band(u8 operating_class,
+                                       enum ieee80211_band *band)
+{
+        switch (operating_class) {
+        case 112:
+        case 115 ... 127:
+                *band = IEEE80211_BAND_5GHZ;
+                return true;
+        case 81:
+        case 82:
+        case 83:
+        case 84:
+                *band = IEEE80211_BAND_2GHZ;
+                return true;
+        }
+
+        return false;
+}
+EXPORT_SYMBOL(ieee80211_operating_class_to_band);
+
 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
                                  u32 beacon_int)
 {