orinoco: Add ESSID specific scanning for Agere fw

Pass the ESSID to the card.

This allows 'iwlist eth1 scan essid <essid>' to work, and will help
with routers setup not to broadcast the ESSID.
Signed-off-by: David Kilroy <kilroyd@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/orinoco.c

@@ -2982,6 +2982,11 @@ static int orinoco_ioctl_getiwrange(struct net_device *dev,
 	range->min_r_time = 0;
 	range->max_r_time = 65535 * 1000;	/* ??? */
 
+	if (priv->firmware_type == FIRMWARE_TYPE_AGERE)
+		range->scan_capa = IW_SCAN_CAPA_ESSID;
+	else
+		range->scan_capa = IW_SCAN_CAPA_NONE;
+
 	/* Event capability (kernel) */
 	IW_EVENT_CAPA_SET_KERNEL(range->event_capa);
 	/* Event capability (driver) */
@@ -3951,6 +3956,7 @@ static int orinoco_ioctl_setscan(struct net_device *dev,
 {
 	struct orinoco_private *priv = netdev_priv(dev);
 	hermes_t *hw = &priv->hw;
+	struct iw_scan_req *si = (struct iw_scan_req *) extra;
 	int err = 0;
 	unsigned long flags;
 
@@ -4012,7 +4018,19 @@ static int orinoco_ioctl_setscan(struct net_device *dev,
 		}
 		break;
 		case FIRMWARE_TYPE_AGERE:
-			err = hermes_write_wordrec(hw, USER_BAP,
+			if (priv->scan_mode & IW_SCAN_THIS_ESSID) {
+				struct hermes_idstring idbuf;
+				size_t len = min(sizeof(idbuf.val),
+						 (size_t) si->essid_len);
+				idbuf.len = cpu_to_le16(len);
+				memcpy(idbuf.val, si->essid, len);
+
+				err = hermes_write_ltv(hw, USER_BAP,
+					       HERMES_RID_CNFSCANSSID_AGERE,
+					       HERMES_BYTES_TO_RECLEN(len + 2),
+					       &idbuf);
+			} else
+				err = hermes_write_wordrec(hw, USER_BAP,
 						   HERMES_RID_CNFSCANSSID_AGERE,
 						   0);	/* Any ESSID */
 			if (err)