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cfg80211/nl80211: add support for scheduled scans

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Implement new functionality for scheduled scan offload.  With this feature we
can scan automatically at certain intervals.

The idea is that the hardware can perform scan automatically and filter on
desired results without waking up the host unnecessarily.

Add NL80211_CMD_START_SCHED_SCAN and NL80211_CMD_STOP_SCHED_SCAN
commands to the nl80211 interface.  When results are available they are
reported by NL80211_CMD_SCHED_SCAN_RESULTS events.  The userspace is
informed when the scheduled scan has stopped with a
NL80211_CMD_SCHED_SCAN_STOPPED event, which can be triggered either by
the driver or by a call to NL80211_CMD_STOP_SCHED_SCAN.

Signed-off-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luciano Coelho
2011-05-11 17:09:35 +03:00
committed by John W. Linville
parent 6bdbdbf4a1
commit 807f8a8c30
7 changed files with 424 additions and 1 deletions
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12
net/wireless/core.c
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@@ -370,7 +370,8 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
spin_lock_init(&rdev->bss_lock);
INIT_LIST_HEAD(&rdev->bss_list);
INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
INIT_WORK(&rdev->sched_scan_stopped_wk, __cfg80211_sched_scan_stopped);
#ifdef CONFIG_CFG80211_WEXT
rdev->wiphy.wext = &cfg80211_wext_handler;
#endif
@@ -672,6 +673,11 @@ static void wdev_cleanup_work(struct work_struct *work)
___cfg80211_scan_done(rdev, true);
}
if (WARN_ON(rdev->sched_scan_req &&
rdev->sched_scan_req->dev == wdev->netdev)) {
__cfg80211_stop_sched_scan(rdev, false);
}
cfg80211_unlock_rdev(rdev);
mutex_lock(&rdev->devlist_mtx);
@@ -759,6 +765,10 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
break;
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_STATION:
cfg80211_lock_rdev(rdev);
__cfg80211_stop_sched_scan(rdev, false);
cfg80211_unlock_rdev(rdev);
wdev_lock(wdev);
#ifdef CONFIG_CFG80211_WEXT
kfree(wdev->wext.ie);