diff options
Diffstat (limited to 'net/wireless_ath/chan.c')
-rwxr-xr-x | net/wireless_ath/chan.c | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/net/wireless_ath/chan.c b/net/wireless_ath/chan.c deleted file mode 100755 index 17cd0c0..0000000 --- a/net/wireless_ath/chan.c +++ /dev/null @@ -1,135 +0,0 @@ -/* - * This file contains helper code to handle channel - * settings and keeping track of what is possible at - * any point in time. - * - * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> - */ - -#include <net/cfg80211.h> -#include "core.h" - -struct ieee80211_channel * -rdev_freq_to_chan(struct cfg80211_registered_device *rdev, - int freq, enum nl80211_channel_type channel_type) -{ - struct ieee80211_channel *chan; - struct ieee80211_sta_ht_cap *ht_cap; - - chan = ieee80211_get_channel(&rdev->wiphy, freq); - - /* Primary channel not allowed */ - if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) - return NULL; - - if (channel_type == NL80211_CHAN_HT40MINUS && - chan->flags & IEEE80211_CHAN_NO_HT40MINUS) - return NULL; - else if (channel_type == NL80211_CHAN_HT40PLUS && - chan->flags & IEEE80211_CHAN_NO_HT40PLUS) - return NULL; - - ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap; - - if (channel_type != NL80211_CHAN_NO_HT) { - if (!ht_cap->ht_supported) - return NULL; - - if (channel_type != NL80211_CHAN_HT20 && - (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || - ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)) - return NULL; - } - - return chan; -} - -static bool can_beacon_sec_chan(struct wiphy *wiphy, - struct ieee80211_channel *chan, - enum nl80211_channel_type channel_type) -{ - struct ieee80211_channel *sec_chan; - int diff; - - switch (channel_type) { - case NL80211_CHAN_HT40PLUS: - diff = 20; - break; - case NL80211_CHAN_HT40MINUS: - diff = -20; - break; - default: - return false; - } - - sec_chan = ieee80211_get_channel(wiphy, chan->center_freq + diff); - if (!sec_chan) - return false; - - /* we'll need a DFS capability later */ - if (sec_chan->flags & (IEEE80211_CHAN_DISABLED | - IEEE80211_CHAN_PASSIVE_SCAN | - IEEE80211_CHAN_NO_IBSS | - IEEE80211_CHAN_RADAR)) - return false; - - return true; -} - -int cfg80211_set_freq(struct cfg80211_registered_device *rdev, - struct wireless_dev *wdev, int freq, - enum nl80211_channel_type channel_type) -{ - struct ieee80211_channel *chan; - int result; - - if (wdev && wdev->iftype == NL80211_IFTYPE_MONITOR) - wdev = NULL; - - if (wdev) { - ASSERT_WDEV_LOCK(wdev); - - if (!netif_running(wdev->netdev)) - return -ENETDOWN; - } - - if (!rdev->ops->set_channel) - return -EOPNOTSUPP; - - chan = rdev_freq_to_chan(rdev, freq, channel_type); - if (!chan) - return -EINVAL; - - /* Both channels should be able to initiate communication */ - if (wdev && (wdev->iftype == NL80211_IFTYPE_ADHOC || - wdev->iftype == NL80211_IFTYPE_AP || - wdev->iftype == NL80211_IFTYPE_AP_VLAN || - wdev->iftype == NL80211_IFTYPE_MESH_POINT || - wdev->iftype == NL80211_IFTYPE_P2P_GO)) { - switch (channel_type) { - case NL80211_CHAN_HT40PLUS: - case NL80211_CHAN_HT40MINUS: - if (!can_beacon_sec_chan(&rdev->wiphy, chan, - channel_type)) { - printk(KERN_DEBUG - "cfg80211: Secondary channel not " - "allowed to initiate communication\n"); - return -EINVAL; - } - break; - default: - break; - } - } - - result = rdev->ops->set_channel(&rdev->wiphy, - wdev ? wdev->netdev : NULL, - chan, channel_type); - if (result) - return result; - - if (wdev) - wdev->channel = chan; - - return 0; -} |