at76c50x-usb: update to latest mac80211 hw scan api

With the latest mac80211 stack, the driver needs to be updated for
cfg80211 scanning.  I based the changes off of modifications for
at76_usb found here:

http://johannes.sipsolutions.net/patches/old/all/2008-09-19-13:35/020-cfg80211-scan.patch

The trick was that max_signal also needs to be set to avoid a divide
by zero Oops.  I just guessed and used the value 100 for now.

kvalo: handpicked the change from two different patches

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: Kalle Valo <kalle.valo@iki.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 18 insertions, 6 deletions

diff --git a/drivers/net/wireless/at76c50x-usb.c b/drivers/net/wireless/at76c50x-usb.c
index e8868aef02b9..df3efc568580 100644
--- a/drivers/net/wireless/at76c50x-usb.c
+++ b/drivers/net/wireless/at76c50x-usb.c
@@ -1861,7 +1861,7 @@ static void at76_dwork_hw_scan(struct work_struct *work)
                 goto exit;
         }
 
-        ieee80211_scan_completed(priv->hw);
+        ieee80211_scan_completed(priv->hw, false);
 
         if (is_valid_ether_addr(priv->bssid))
                 at76_join(priv);
@@ -1872,14 +1872,15 @@ exit:
         mutex_unlock(&priv->mtx);
 }
 
-static int at76_hw_scan(struct ieee80211_hw *hw, u8 *ssid, size_t len)
+static int at76_hw_scan(struct ieee80211_hw *hw,
+                        struct cfg80211_scan_request *req)
 {
         struct at76_priv *priv = hw->priv;
         struct at76_req_scan scan;
-        int ret;
+        u8 *ssid = NULL;
+        int ret, len = 0;
 
         at76_dbg(DBG_MAC80211, "%s():", __func__);
-        at76_dbg_dump(DBG_MAC80211, ssid, len, "ssid %zd bytes:", len);
 
         mutex_lock(&priv->mtx);
 
@@ -1887,11 +1888,20 @@ static int at76_hw_scan(struct ieee80211_hw *hw, u8 *ssid, size_t len)
 
         memset(&scan, 0, sizeof(struct at76_req_scan));
         memset(scan.bssid, 0xFF, ETH_ALEN);
-        scan.scan_type = SCAN_TYPE_ACTIVE;
-        if (priv->essid_size > 0) {
+
+        if (req->n_ssids) {
+                scan.scan_type = SCAN_TYPE_ACTIVE;
+                ssid = req->ssids[0].ssid;
+                len = req->ssids[0].ssid_len;
+        } else {
+                scan.scan_type = SCAN_TYPE_PASSIVE;
+        }
+
+        if (len) {
                 memcpy(scan.essid, ssid, len);
                 scan.essid_size = len;
         }
+
         scan.min_channel_time = cpu_to_le16(priv->scan_min_time);
         scan.max_channel_time = cpu_to_le16(priv->scan_max_time);
         scan.probe_delay = cpu_to_le16(priv->scan_min_time * 1000);
@@ -2217,10 +2227,12 @@ static int at76_init_new_device(struct at76_priv *priv,
         priv->scan_mode = SCAN_TYPE_ACTIVE;
 
         /* mac80211 initialisation */
+        priv->hw->wiphy->max_scan_ssids = 1;
         priv->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
         priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &at76_supported_band;
         priv->hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
                           IEEE80211_HW_SIGNAL_UNSPEC;
+        priv->hw->max_signal = 100;
 
         SET_IEEE80211_DEV(priv->hw, &interface->dev);
         SET_IEEE80211_PERM_ADDR(priv->hw, priv->mac_addr);