wl1271: add get_survey callback in order to get channel noise

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Acked-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>

drivers/net/wireless/wl12xx/wl1271_main.c

@@ -1927,6 +1927,22 @@ out:
 	return mactime;
 }
 
+static int wl1271_op_get_survey(struct ieee80211_hw *hw, int idx,
+				struct survey_info *survey)
+{
+	struct wl1271 *wl = hw->priv;
+	struct ieee80211_conf *conf = &hw->conf;
+ 
+	if (idx != 0)
+		return -ENOENT;
+ 
+	survey->channel = conf->channel;
+	survey->filled = SURVEY_INFO_NOISE_DBM;
+	survey->noise = wl->noise;
+ 
+	return 0;
+}
+
 /* can't be const, mac80211 writes to this */
 static struct ieee80211_rate wl1271_rates[] = {
 	{ .bitrate = 10,
@@ -2156,6 +2172,7 @@ static const struct ieee80211_ops wl1271_ops = {
 	.set_rts_threshold = wl1271_op_set_rts_threshold,
 	.conf_tx = wl1271_op_conf_tx,
 	.get_tsf = wl1271_op_get_tsf,
+	.get_survey = wl1271_op_get_survey,
 	CFG80211_TESTMODE_CMD(wl1271_tm_cmd)
 };