mac80211: sample survey implementation for mac80211 & hwsim

This adds the survey function to both mac80211 itself and to mac80211_hwsim.
For the latter driver, we simply invent some noise level.A real driver which
cannot determine the real channel noise MUST NOT report any noise, especially
not a magically conjured one :-)

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index ec8b08291790..79bb8833ddb9 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -829,6 +829,33 @@ static int mac80211_hwsim_conf_tx(
         return 0;
 }
 
+static int mac80211_hwsim_get_survey(
+        struct ieee80211_hw *hw, int idx,
+        struct survey_info *survey)
+{
+        struct ieee80211_conf *conf = &hw->conf;
+
+        printk(KERN_DEBUG "%s:%s (idx=%d)\n",
+               wiphy_name(hw->wiphy), __func__, idx);
+
+        if (idx != 0)
+                return -ENOENT;
+
+        /* Current channel */
+        survey->channel = conf->channel;
+
+        /*
+         * Magically conjured noise level --- this is only ok for simulated hardware.
+         *
+         * A real driver which cannot determine the real channel noise MUST NOT
+         * report any noise, especially not a magically conjured one :-)
+         */
+        survey->filled = SURVEY_INFO_NOISE_DBM;
+        survey->noise = -92;
+
+        return 0;
+}
+
 #ifdef CONFIG_NL80211_TESTMODE
 /*
  * This section contains example code for using netlink
@@ -1012,6 +1039,7 @@ static struct ieee80211_ops mac80211_hwsim_ops =
         .sta_notify = mac80211_hwsim_sta_notify,
         .set_tim = mac80211_hwsim_set_tim,
         .conf_tx = mac80211_hwsim_conf_tx,
+        .get_survey = mac80211_hwsim_get_survey,
         CFG80211_TESTMODE_CMD(mac80211_hwsim_testmode_cmd)
         .ampdu_action = mac80211_hwsim_ampdu_action,
         .sw_scan_start = mac80211_hwsim_sw_scan,