Return-path: Received: from mail30s.wh2.ocn.ne.jp ([125.206.180.198]:9561 "HELO mail30s.wh2.ocn.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753572Ab0LHDpA (ORCPT ); Tue, 7 Dec 2010 22:45:00 -0500 Received: from vs3002.wh2.ocn.ne.jp (125.206.180.165) by mail30s.wh2.ocn.ne.jp (RS ver 1.0.95vs) with SMTP id 3-0327619897 for ; Wed, 8 Dec 2010 12:44:58 +0900 (JST) Subject: [PATCH v2] cfg80211: Add antenna availability information To: johannes@sipsolutions.net, linville@tuxdriver.com From: Bruno Randolf Cc: linux-wireless@vger.kernel.org Date: Wed, 08 Dec 2010 12:44:29 +0900 Message-ID: <20101208034429.24218.50707.stgit@localhost6.localdomain6> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-wireless-owner@vger.kernel.org List-ID: 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 v2: reject antenna configurations which don't match the available antennas --- include/net/cfg80211.h | 5 +++++ net/wireless/nl80211.c | 12 ++++++++++-- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 8764c9a..ef6f15d 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -1465,6 +1465,9 @@ 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 */ @@ -1504,6 +1507,8 @@ 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 diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 2cf0333..4f6ff31 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -547,7 +547,7 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags, if (dev->wiphy.flags & WIPHY_FLAG_CONTROL_PORT_PROTOCOL) NLA_PUT_FLAG(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE); - if (dev->ops->get_antenna) { + if (dev->wiphy.available_antennas && dev->ops->get_antenna) { u32 tx_ant = 0, rx_ant = 0; int res; res = dev->ops->get_antenna(&dev->wiphy, &tx_ant, &rx_ant); @@ -1045,7 +1045,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] && info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]) { u32 tx_ant, rx_ant; - if (!rdev->ops->set_antenna) { + if (!rdev->wiphy.available_antennas || !rdev->ops->set_antenna) { result = -EOPNOTSUPP; goto bad_res; } @@ -1053,6 +1053,14 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info) tx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX]); rx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]); + /* reject antenna configurations which don't match the + * available antenna mask, except for the "all" mask */ + if ((~tx_ant && (tx_ant & ~rdev->wiphy.available_antennas)) || + (~rx_ant && (rx_ant & ~rdev->wiphy.available_antennas))) { + result = -EINVAL; + goto bad_res; + } + result = rdev->ops->set_antenna(&rdev->wiphy, tx_ant, rx_ant); if (result) goto bad_res;