wl1251: create qos null data template

The qos null data template is needed for U-APSD.
Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251_main.c

@@ -563,6 +563,27 @@ static void wl1251_op_remove_interface(struct ieee80211_hw *hw,
 	mutex_unlock(&wl->mutex);
 }
 
+static int wl1251_build_qos_null_data(struct wl1251 *wl)
+{
+	struct ieee80211_qos_hdr template;
+
+	memset(&template, 0, sizeof(template));
+
+	memcpy(template.addr1, wl->bssid, ETH_ALEN);
+	memcpy(template.addr2, wl->mac_addr, ETH_ALEN);
+	memcpy(template.addr3, wl->bssid, ETH_ALEN);
+
+	template.frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
+					     IEEE80211_STYPE_QOS_NULLFUNC |
+					     IEEE80211_FCTL_TODS);
+
+	/* FIXME: not sure what priority to use here */
+	template.qos_ctrl = cpu_to_le16(0);
+
+	return wl1251_cmd_template_set(wl, CMD_QOS_NULL_DATA, &template,
+				       sizeof(template));
+}
+
 static int wl1251_op_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct wl1251 *wl = hw->priv;
@@ -948,6 +969,10 @@ static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
 		if (ret < 0)
 			goto out_sleep;
 
+		ret = wl1251_build_qos_null_data(wl);
+		if (ret < 0)
+			goto out;
+
 		if (wl->bss_type != BSS_TYPE_IBSS) {
 			ret = wl1251_join(wl, wl->bss_type, wl->channel,
 					  wl->beacon_int, wl->dtim_period);