cfg80211: Add antenna availability information

Add a field to wiphy for the hardware to report the availble antennas for
configuration. Only if this is set to something bigger than zero, will the
anntenna configuration ops be executed.

Allthough this could be a simple number of antennas, I defined it as a bitmap
of antennas which are available for configuration, since it's more consistent
with the rest of the antenna API and there could be cases where the
hardware allows only configuration of certain antennas. As it does not make
much of a difference in size or normal usage, I think it's better to be able to
support this, in case the need arises.

The antenna configuration is now also checked against the availabe antennas and
rejected if it does not match.

Signed-off-by: Bruno Randolf <br1@einfach.org>

--
v3:	always apply available antenna mask (for "all" antennas case).

v2:	reject antenna configurations which don't match the available antennas
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 0d5979924be3..4d5acb013636 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1468,6 +1468,9 @@ struct ieee80211_txrx_stypes {
  * @mgmt_stypes: bitmasks of frame subtypes that can be subscribed to or
  *      transmitted through nl80211, points to an array indexed by interface
  *      type
+ *
+ * @available_antennas: bitmap of antennas which are available to configure.
+ *      antenna configuration commands will be rejected unless this is set.
  */
 struct wiphy {
         /* assign these fields before you register the wiphy */
@@ -1507,6 +1510,8 @@ struct wiphy {
 
         u8 max_num_pmkids;
 
+        u32 available_antennas;
+
         /* If multiple wiphys are registered and you're handed e.g.
          * a regular netdev with assigned ieee80211_ptr, you won't
          * know whether it points to a wiphy your driver has registered