mac80211: add phy information to giwname

This patch add phy information to giwname.

Quoting:
It's not useless, it's supposed to tell you about the protocol
capability of the device, like "IEEE 802.11b" or "IEEE 802.11abg"

Jean
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/mac80211/wext.c

@@ -135,7 +135,39 @@ static int ieee80211_ioctl_giwname(struct net_device *dev,
 				   struct iw_request_info *info,
 				   char *name, char *extra)
 {
+	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+	struct ieee80211_supported_band *sband;
+	u8 is_ht = 0, is_a = 0, is_b = 0, is_g = 0;
+
+
+	sband = local->hw.wiphy->bands[IEEE80211_BAND_5GHZ];
+	if (sband) {
+		is_a = 1;
+		is_ht |= sband->ht_info.ht_supported;
+	}
+
+	sband = local->hw.wiphy->bands[IEEE80211_BAND_2GHZ];
+	if (sband) {
+		int i;
+		/* Check for mandatory rates */
+		for (i = 0; i < sband->n_bitrates; i++) {
+			if (sband->bitrates[i].bitrate == 10)
+				is_b = 1;
+			if (sband->bitrates[i].bitrate == 60)
+				is_g = 1;
+		}
+		is_ht |= sband->ht_info.ht_supported;
+	}
+
 	strcpy(name, "IEEE 802.11");
+	if (is_a)
+		strcat(name, "a");
+	if (is_b)
+		strcat(name, "b");
+	if (is_g)
+		strcat(name, "g");
+	if (is_ht)
+		strcat(name, "n");
 
 	return 0;
 }