[PATCH] ipw2200: enable wireless extension passive scan
This patch enables the ipw2200 driver to support passive scanning as
offered by the wireless extensions. For this, I enhanced the ipw_wx_set_scan
function in such a way that it differentiates between a passive and an
active scan request. Additionally, I added a new function called
ipw_request_passive_scan that is similiar to the ipw_request_scan
function to perform passive scans. Last but not least, I added a field
(in fact it is a work_struct struct) called request_passive_scan to
the ipw_priv struct.
Signed-off-by: Thomas King <king@informatik.uni-mannheim.de>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
index 1525830..ea14b55 100644
--- a/drivers/net/wireless/ipw2200.c
+++ b/drivers/net/wireless/ipw2200.c
@@ -6169,7 +6169,7 @@
}
}
-static int ipw_request_scan(struct ipw_priv *priv)
+static int ipw_request_scan_helper(struct ipw_priv *priv, int type)
{
struct ipw_scan_request_ext scan;
int err = 0, scan_type;
@@ -6200,19 +6200,29 @@
}
memset(&scan, 0, sizeof(scan));
+ scan.full_scan_index = cpu_to_le32(ieee80211_get_scans(priv->ieee));
- if (priv->config & CFG_SPEED_SCAN)
+ if (type == IW_SCAN_TYPE_PASSIVE) {
+ IPW_DEBUG_WX("use passive scanning\n");
+ scan_type = IPW_SCAN_PASSIVE_FULL_DWELL_SCAN;
+ scan.dwell_time[IPW_SCAN_PASSIVE_FULL_DWELL_SCAN] =
+ cpu_to_le16(120);
+ ipw_add_scan_channels(priv, &scan, scan_type);
+ goto send_request;
+ }
+
+ /* Use active scan by default. */
+ if (priv->config & CFG_SPEED_SCAN)
scan.dwell_time[IPW_SCAN_ACTIVE_BROADCAST_SCAN] =
- cpu_to_le16(30);
+ cpu_to_le16(30);
else
scan.dwell_time[IPW_SCAN_ACTIVE_BROADCAST_SCAN] =
- cpu_to_le16(20);
+ cpu_to_le16(20);
scan.dwell_time[IPW_SCAN_ACTIVE_BROADCAST_AND_DIRECT_SCAN] =
- cpu_to_le16(20);
- scan.dwell_time[IPW_SCAN_PASSIVE_FULL_DWELL_SCAN] = cpu_to_le16(120);
+ cpu_to_le16(20);
- scan.full_scan_index = cpu_to_le32(ieee80211_get_scans(priv->ieee));
+ scan.dwell_time[IPW_SCAN_PASSIVE_FULL_DWELL_SCAN] = cpu_to_le16(120);
#ifdef CONFIG_IPW2200_MONITOR
if (priv->ieee->iw_mode == IW_MODE_MONITOR) {
@@ -6249,7 +6259,7 @@
*
* TODO: Move SPEED SCAN support to all modes and bands */
scan.dwell_time[IPW_SCAN_PASSIVE_FULL_DWELL_SCAN] =
- cpu_to_le16(2000);
+ cpu_to_le16(2000);
} else {
#endif /* CONFIG_IPW2200_MONITOR */
/* If we are roaming, then make this a directed scan for the
@@ -6275,6 +6285,7 @@
}
#endif
+send_request:
err = ipw_send_scan_request_ext(priv, &scan);
if (err) {
IPW_DEBUG_HC("Sending scan command failed: %08X\n", err);
@@ -6285,11 +6296,19 @@
priv->status &= ~STATUS_SCAN_PENDING;
queue_delayed_work(priv->workqueue, &priv->scan_check,
IPW_SCAN_CHECK_WATCHDOG);
- done:
+done:
mutex_unlock(&priv->mutex);
return err;
}
+static int ipw_request_passive_scan(struct ipw_priv *priv) {
+ return ipw_request_scan_helper(priv, IW_SCAN_TYPE_PASSIVE);
+}
+
+static int ipw_request_scan(struct ipw_priv *priv) {
+ return ipw_request_scan_helper(priv, IW_SCAN_TYPE_ACTIVE);
+}
+
static void ipw_bg_abort_scan(void *data)
{
struct ipw_priv *priv = data;
@@ -9378,15 +9397,19 @@
union iwreq_data *wrqu, char *extra)
{
struct ipw_priv *priv = ieee80211_priv(dev);
- struct iw_scan_req *req = NULL;
- if (wrqu->data.length
- && wrqu->data.length == sizeof(struct iw_scan_req)) {
- req = (struct iw_scan_req *)extra;
+ struct iw_scan_req *req = (struct iw_scan_req *)extra;
+
+ if (wrqu->data.length == sizeof(struct iw_scan_req)) {
if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
ipw_request_direct_scan(priv, req->essid,
req->essid_len);
return 0;
}
+ if (req->scan_type == IW_SCAN_TYPE_PASSIVE) {
+ queue_work(priv->workqueue,
+ &priv->request_passive_scan);
+ return 0;
+ }
}
IPW_DEBUG_WX("Start scan\n");
@@ -10618,6 +10641,8 @@
INIT_WORK(&priv->down, (void (*)(void *))ipw_bg_down, priv);
INIT_WORK(&priv->request_scan,
(void (*)(void *))ipw_request_scan, priv);
+ INIT_WORK(&priv->request_passive_scan,
+ (void (*)(void *))ipw_request_passive_scan, priv);
INIT_WORK(&priv->gather_stats,
(void (*)(void *))ipw_bg_gather_stats, priv);
INIT_WORK(&priv->abort_scan, (void (*)(void *))ipw_bg_abort_scan, priv);