Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6a4329554c527e86c2745bc001c29bb8d1b8efaf
Commit:     6a4329554c527e86c2745bc001c29bb8d1b8efaf
Parent:     c7b6ea24b43afb5749cb704e143df19d70e23dea
Author:     Mattias Nissler <[EMAIL PROTECTED]>
AuthorDate: Wed Oct 24 23:30:36 2007 +0200
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Mon Jan 28 14:54:19 2008 -0800

    mac80211: Accept auto txpower setting
    
    This changes the SIWTXPOWER ioctl to also accept a txpower setting of
    "automatic". Since mac80211 currently cannot tell drivers to automatically
    adjust tx power, we select the tx power level of the current channel. While
    this is kind of a hack, it certainly saves some iwconfig users from 
headaches.
    
    Signed-off-by: Mattias Nissler <[EMAIL PROTECTED]>
    Signed-off-by: John W. Linville <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 net/mac80211/ieee80211_ioctl.c |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/ieee80211_ioctl.c b/net/mac80211/ieee80211_ioctl.c
index 308bbe4..da3350d 100644
--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -634,22 +634,35 @@ static int ieee80211_ioctl_siwtxpower(struct net_device 
*dev,
 {
        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
        bool need_reconfig = 0;
+       u8 new_power_level;
 
        if ((data->txpower.flags & IW_TXPOW_TYPE) != IW_TXPOW_DBM)
                return -EINVAL;
        if (data->txpower.flags & IW_TXPOW_RANGE)
                return -EINVAL;
-       if (!data->txpower.fixed)
-               return -EINVAL;
 
-       if (local->hw.conf.power_level != data->txpower.value) {
-               local->hw.conf.power_level = data->txpower.value;
+       if (data->txpower.fixed) {
+               new_power_level = data->txpower.value;
+       } else {
+               /* Automatic power level. Get the px power from the current
+                * channel. */
+               struct ieee80211_channel* chan = local->oper_channel;
+               if (!chan)
+                       return -EINVAL;
+
+               new_power_level = chan->power_level;
+       }
+
+       if (local->hw.conf.power_level != new_power_level) {
+               local->hw.conf.power_level = new_power_level;
                need_reconfig = 1;
        }
+
        if (local->hw.conf.radio_enabled != !(data->txpower.disabled)) {
                local->hw.conf.radio_enabled = !(data->txpower.disabled);
                need_reconfig = 1;
        }
+
        if (need_reconfig) {
                ieee80211_hw_config(local);
                /* The return value of hw_config is not of big interest here,
-
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