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cfg80211/mac80211: use reduced txpower for 5 and 10 MHz

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Some regulations (like germany, but also FCC) express their transmission
power limit in dBm/MHz or mW/MHz. To cope with that and be on the safe
side, reduce the maximum power to half (10 MHz) or quarter (5 MHz)
when operating on these reduced bandwidth channels.

Signed-off-by: Simon Wunderlich <[email protected]>
Signed-off-by: Mathias Kretschmer <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Simon Wunderlich 2013-07-08 16:55:55 +02:00 • committed by Johannes Berg
commit 0430c88347
4 changed files with 31 additions and 3 deletions
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2
net/mac80211/iface.c
View file

@ -54,7 +54,7 @@ bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
return false;
}
power = chanctx_conf->def.chan->max_power;
power = ieee80211_chandef_max_power(&chanctx_conf->def);
rcu_read_unlock();
if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)

2
net/mac80211/main.c
View file

@ -151,7 +151,7 @@ static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
changed |= IEEE80211_CONF_CHANGE_SMPS;
}
power = chandef.chan->max_power;
power = ieee80211_chandef_max_power(&chandef);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {

3
net/mac80211/mlme.c
View file

@ -747,7 +747,8 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
*pos++ = WLAN_EID_PWR_CAPABILITY;
*pos++ = 2;
*pos++ = 0; /* min tx power */
*pos++ = chan->max_power; /* max tx power */
/* max tx power */
*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
/* 2. supported channels */
/* TODO: get this in reg domain format */