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authorJouni Malinen <jouni.malinen@atheros.com>2009-12-23 13:15:41 +0100
committerJohn W. Linville <linville@tuxdriver.com>2009-12-28 16:55:02 -0500
commit9588bbd5529461a3dacd435bf239c84c3508f569 (patch)
treedd00011714bdefdef1f818ac7caf53682253a515 /net/wireless/chan.c
parentb203ffc3a447eb8d9e6120b783ddee081b143061 (diff)
cfg80211: add remain-on-channel command
Add new commands for requesting the driver to remain awake on a specified channel for the specified amount of time (and another command to cancel such an operation). This can be used to implement userspace-controlled off-channel operations, like Public Action frame exchange on another channel than the operation channel. The off-channel operation should behave similarly to scan, i.e. the local station (if associated) moves into power save mode to request the AP to buffer frames for it and then moves to the other channel to allow the off-channel operation to be completed. The duration parameter can be used to request enough time to receive a response from the target station. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/chan.c')
-rw-r--r--net/wireless/chan.c41
1 files changed, 27 insertions, 14 deletions
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index a46ac6c9b365..bf1737fc9a7e 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -41,44 +41,57 @@ rdev_fixed_channel(struct cfg80211_registered_device *rdev,
return result;
}
-int rdev_set_freq(struct cfg80211_registered_device *rdev,
- struct wireless_dev *for_wdev,
+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;
- int result;
-
- if (rdev_fixed_channel(rdev, for_wdev))
- return -EBUSY;
-
- if (!rdev->ops->set_channel)
- return -EOPNOTSUPP;
chan = ieee80211_get_channel(&rdev->wiphy, freq);
/* Primary channel not allowed */
if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
- return -EINVAL;
+ return NULL;
if (channel_type == NL80211_CHAN_HT40MINUS &&
chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
- return -EINVAL;
+ return NULL;
else if (channel_type == NL80211_CHAN_HT40PLUS &&
chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
- return -EINVAL;
+ return NULL;
ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap;
if (channel_type != NL80211_CHAN_NO_HT) {
if (!ht_cap->ht_supported)
- return -EINVAL;
+ return NULL;
if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
- return -EINVAL;
+ return NULL;
}
+ return chan;
+}
+
+int rdev_set_freq(struct cfg80211_registered_device *rdev,
+ struct wireless_dev *for_wdev,
+ int freq, enum nl80211_channel_type channel_type)
+{
+ struct ieee80211_channel *chan;
+ int result;
+
+ if (rdev_fixed_channel(rdev, for_wdev))
+ return -EBUSY;
+
+ if (!rdev->ops->set_channel)
+ return -EOPNOTSUPP;
+
+ chan = rdev_freq_to_chan(rdev, freq, channel_type);
+ if (!chan)
+ return -EINVAL;
+
result = rdev->ops->set_channel(&rdev->wiphy, chan, channel_type);
if (result)
return result;