blob: b01a6f6397d7be03659547f98f06569011ffac77 [file] [log] [blame]
Johannes Berg59bbb6f2009-08-07 17:22:35 +02001/*
2 * This file contains helper code to handle channel
3 * settings and keeping track of what is possible at
4 * any point in time.
5 *
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7 */
8
9#include <net/cfg80211.h>
10#include "core.h"
11
12struct ieee80211_channel *
Jouni Malinen9588bbd2009-12-23 13:15:41 +010013rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
14 int freq, enum nl80211_channel_type channel_type)
15{
16 struct ieee80211_channel *chan;
17 struct ieee80211_sta_ht_cap *ht_cap;
18
19 chan = ieee80211_get_channel(&rdev->wiphy, freq);
20
21 /* Primary channel not allowed */
22 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
23 return NULL;
24
25 if (channel_type == NL80211_CHAN_HT40MINUS &&
26 chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
27 return NULL;
28 else if (channel_type == NL80211_CHAN_HT40PLUS &&
29 chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
30 return NULL;
31
32 ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap;
33
34 if (channel_type != NL80211_CHAN_NO_HT) {
35 if (!ht_cap->ht_supported)
36 return NULL;
37
38 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
39 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
40 return NULL;
41 }
42
43 return chan;
44}
45
Johannes Bergf444de02010-05-05 15:25:02 +020046int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
47 struct wireless_dev *wdev, int freq,
48 enum nl80211_channel_type channel_type)
Johannes Berg59bbb6f2009-08-07 17:22:35 +020049{
50 struct ieee80211_channel *chan;
Johannes Berg59bbb6f2009-08-07 17:22:35 +020051 int result;
52
Felix Fietkau9fbc6302010-05-15 15:46:17 +020053 if (wdev && wdev->iftype == NL80211_IFTYPE_MONITOR)
Johannes Bergf444de02010-05-05 15:25:02 +020054 wdev = NULL;
55
56 if (wdev) {
57 ASSERT_WDEV_LOCK(wdev);
58
59 if (!netif_running(wdev->netdev))
60 return -ENETDOWN;
61 }
Johannes Berg59bbb6f2009-08-07 17:22:35 +020062
63 if (!rdev->ops->set_channel)
64 return -EOPNOTSUPP;
65
Jouni Malinen9588bbd2009-12-23 13:15:41 +010066 chan = rdev_freq_to_chan(rdev, freq, channel_type);
67 if (!chan)
Johannes Berg59bbb6f2009-08-07 17:22:35 +020068 return -EINVAL;
69
Johannes Bergf444de02010-05-05 15:25:02 +020070 result = rdev->ops->set_channel(&rdev->wiphy,
71 wdev ? wdev->netdev : NULL,
72 chan, channel_type);
Johannes Berg59bbb6f2009-08-07 17:22:35 +020073 if (result)
74 return result;
75
Johannes Bergf444de02010-05-05 15:25:02 +020076 if (wdev)
77 wdev->channel = chan;
Johannes Berg59bbb6f2009-08-07 17:22:35 +020078
79 return 0;
80}