orinoco: convert scanning to cfg80211

This removes the custom scan cache used by orinoco.

We also have to avoid calling cfg80211_scan_done from the hard
interrupt, so we offload the entirety of scan processing to a workqueue.

This may behave strangely if you start scanning just prior to
suspending...

Signed-off-by: David Kilroy <kilroyd@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/orinoco/cfg.c

@@ -137,6 +137,26 @@ static int orinoco_change_vif(struct wiphy *wiphy, struct net_device *dev,
 	return err;
 }
 
+static int orinoco_scan(struct wiphy *wiphy, struct net_device *dev,
+			struct cfg80211_scan_request *request)
+{
+	struct orinoco_private *priv = wiphy_priv(wiphy);
+	int err;
+
+	if (!request)
+		return -EINVAL;
+
+	if (priv->scan_request && priv->scan_request != request)
+		return -EBUSY;
+
+	priv->scan_request = request;
+
+	err = orinoco_hw_trigger_scan(priv, request->ssids);
+
+	return err;
+}
+
 const struct cfg80211_ops orinoco_cfg_ops = {
 	.change_virtual_intf = orinoco_change_vif,
+	.scan = orinoco_scan,
 };

drivers/net/wireless/orinoco/hermes.h

@@ -342,7 +342,7 @@ struct agere_ext_scan_info {
 	__le64	timestamp;
 	__le16	beacon_interval;
 	__le16	capabilities;
-	u8	data[316];
+	u8	data[0];
 } __attribute__ ((packed));
 
 #define HERMES_LINKSTATUS_NOT_CONNECTED   (0x0000)

drivers/net/wireless/orinoco/hw.c

@@ -1157,3 +1157,88 @@ int orinoco_hw_get_bitratelist(struct orinoco_private *priv,
 
 	return 0;
 }
+
+int orinoco_hw_trigger_scan(struct orinoco_private *priv,
+			    const struct cfg80211_ssid *ssid)
+{
+	struct net_device *dev = priv->ndev;
+	hermes_t *hw = &priv->hw;
+	unsigned long flags;
+	int err = 0;
+
+	if (orinoco_lock(priv, &flags) != 0)
+		return -EBUSY;
+
+	/* Scanning with port 0 disabled would fail */
+	if (!netif_running(dev)) {
+		err = -ENETDOWN;
+		goto out;
+	}
+
+	/* In monitor mode, the scan results are always empty.
+	 * Probe responses are passed to the driver as received
+	 * frames and could be processed in software. */
+	if (priv->iw_mode == NL80211_IFTYPE_MONITOR) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (priv->has_hostscan) {
+		switch (priv->firmware_type) {
+		case FIRMWARE_TYPE_SYMBOL:
+			err = hermes_write_wordrec(hw, USER_BAP,
+						HERMES_RID_CNFHOSTSCAN_SYMBOL,
+						HERMES_HOSTSCAN_SYMBOL_ONCE |
+						HERMES_HOSTSCAN_SYMBOL_BCAST);
+			break;
+		case FIRMWARE_TYPE_INTERSIL: {
+			__le16 req[3];
+
+			req[0] = cpu_to_le16(0x3fff);	/* All channels */
+			req[1] = cpu_to_le16(0x0001);	/* rate 1 Mbps */
+			req[2] = 0;			/* Any ESSID */
+			err = HERMES_WRITE_RECORD(hw, USER_BAP,
+						  HERMES_RID_CNFHOSTSCAN, &req);
+			break;
+		}
+		case FIRMWARE_TYPE_AGERE:
+			if (ssid->ssid_len > 0) {
+				struct hermes_idstring idbuf;
+				size_t len = ssid->ssid_len;
+
+				idbuf.len = cpu_to_le16(len);
+				memcpy(idbuf.val, ssid->ssid, 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)
+				break;
+
+			if (priv->has_ext_scan) {
+				err = hermes_write_wordrec(hw, USER_BAP,
+						HERMES_RID_CNFSCANCHANNELS2GHZ,
+						0x7FFF);
+				if (err)
+					goto out;
+
+				err = hermes_inquire(hw,
+						     HERMES_INQ_CHANNELINFO);
+			} else
+				err = hermes_inquire(hw, HERMES_INQ_SCAN);
+
+			break;
+		}
+	} else
+		err = hermes_inquire(hw, HERMES_INQ_SCAN);
+
+ out:
+	orinoco_unlock(priv, &flags);
+
+	return err;
+}

drivers/net/wireless/orinoco/hw.h

@@ -7,6 +7,7 @@
 
 #include <linux/types.h>
 #include <linux/wireless.h>
+#include <net/cfg80211.h>
 
 /* Hardware BAPs */
 #define USER_BAP 0
@@ -47,5 +48,7 @@ int orinoco_hw_get_essid(struct orinoco_private *priv, int *active,
 int orinoco_hw_get_freq(struct orinoco_private *priv);
 int orinoco_hw_get_bitratelist(struct orinoco_private *priv,
 			       int *numrates, s32 *rates, int max);
+int orinoco_hw_trigger_scan(struct orinoco_private *priv,
+			    const struct cfg80211_ssid *ssid);
 
 #endif /* _ORINOCO_HW_H_ */