2 * This file contains helper code to handle channel
3 * settings and keeping track of what is possible at
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
9 #include <net/cfg80211.h>
12 struct ieee80211_channel
*
13 rdev_fixed_channel(struct cfg80211_registered_device
*rdev
,
14 struct wireless_dev
*for_wdev
)
16 struct wireless_dev
*wdev
;
17 struct ieee80211_channel
*result
= NULL
;
19 WARN_ON(!mutex_is_locked(&rdev
->devlist_mtx
));
21 list_for_each_entry(wdev
, &rdev
->netdev_list
, list
) {
26 * Lock manually to tell lockdep about allowed
27 * nesting here if for_wdev->mtx is held already.
28 * This is ok as it's all under the rdev devlist
29 * mutex and as such can only be done once at any
32 mutex_lock_nested(&wdev
->mtx
, SINGLE_DEPTH_NESTING
);
33 if (wdev
->current_bss
)
34 result
= wdev
->current_bss
->pub
.channel
;
44 struct ieee80211_channel
*
45 rdev_freq_to_chan(struct cfg80211_registered_device
*rdev
,
46 int freq
, enum nl80211_channel_type channel_type
)
48 struct ieee80211_channel
*chan
;
49 struct ieee80211_sta_ht_cap
*ht_cap
;
51 chan
= ieee80211_get_channel(&rdev
->wiphy
, freq
);
53 /* Primary channel not allowed */
54 if (!chan
|| chan
->flags
& IEEE80211_CHAN_DISABLED
)
57 if (channel_type
== NL80211_CHAN_HT40MINUS
&&
58 chan
->flags
& IEEE80211_CHAN_NO_HT40MINUS
)
60 else if (channel_type
== NL80211_CHAN_HT40PLUS
&&
61 chan
->flags
& IEEE80211_CHAN_NO_HT40PLUS
)
64 ht_cap
= &rdev
->wiphy
.bands
[chan
->band
]->ht_cap
;
66 if (channel_type
!= NL80211_CHAN_NO_HT
) {
67 if (!ht_cap
->ht_supported
)
70 if (!(ht_cap
->cap
& IEEE80211_HT_CAP_SUP_WIDTH_20_40
) ||
71 ht_cap
->cap
& IEEE80211_HT_CAP_40MHZ_INTOLERANT
)
78 int rdev_set_freq(struct cfg80211_registered_device
*rdev
,
79 struct wireless_dev
*for_wdev
,
80 int freq
, enum nl80211_channel_type channel_type
)
82 struct ieee80211_channel
*chan
;
85 if (rdev_fixed_channel(rdev
, for_wdev
))
88 if (!rdev
->ops
->set_channel
)
91 chan
= rdev_freq_to_chan(rdev
, freq
, channel_type
);
95 result
= rdev
->ops
->set_channel(&rdev
->wiphy
, chan
, channel_type
);