wl1271: add get_survey callback in order to get channel noise

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Acked-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>

3 files changed, 27 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271.h b/drivers/net/wireless/wl12xx/wl1271.h
index 53d47d7a2a1d..dd3cee6ea5bb 100644
--- a/drivers/net/wireless/wl12xx/wl1271.h
+++ b/drivers/net/wireless/wl12xx/wl1271.h
@@ -475,6 +475,9 @@ struct wl1271 {
         bool sg_enabled;
 
         struct list_head list;
+
+        /* Most recently reported noise in dBm */
+        s8 noise;
 };
 
 int wl1271_plt_start(struct wl1271 *wl);
diff --git a/drivers/net/wireless/wl12xx/wl1271_main.c b/drivers/net/wireless/wl12xx/wl1271_main.c
index 864318f096ea..374abf0f5cc7 100644
--- a/drivers/net/wireless/wl12xx/wl1271_main.c
+++ b/drivers/net/wireless/wl12xx/wl1271_main.c
@@ -1927,6 +1927,22 @@ out:
         return mactime;
 }
 
+static int wl1271_op_get_survey(struct ieee80211_hw *hw, int idx,
+                                struct survey_info *survey)
+{
+        struct wl1271 *wl = hw->priv;
+        struct ieee80211_conf *conf = &hw->conf;
+ 
+        if (idx != 0)
+                return -ENOENT;
+ 
+        survey->channel = conf->channel;
+        survey->filled = SURVEY_INFO_NOISE_DBM;
+        survey->noise = wl->noise;
+ 
+        return 0;
+}
+
 /* can't be const, mac80211 writes to this */
 static struct ieee80211_rate wl1271_rates[] = {
         { .bitrate = 10,
@@ -2156,6 +2172,7 @@ static const struct ieee80211_ops wl1271_ops = {
         .set_rts_threshold = wl1271_op_set_rts_threshold,
         .conf_tx = wl1271_op_conf_tx,
         .get_tsf = wl1271_op_get_tsf,
+        .get_survey = wl1271_op_get_survey,
         CFG80211_TESTMODE_CMD(wl1271_tm_cmd)
 };
 
diff --git a/drivers/net/wireless/wl12xx/wl1271_rx.c b/drivers/net/wireless/wl12xx/wl1271_rx.c
index e98f22b3c3ba..019aa79cd9df 100644
--- a/drivers/net/wireless/wl12xx/wl1271_rx.c
+++ b/drivers/net/wireless/wl12xx/wl1271_rx.c
@@ -55,6 +55,13 @@ static void wl1271_rx_status(struct wl1271 *wl,
 
         status->signal = desc->rssi;
 
+        /*
+         * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
+         * need to divide by two for now, but TI has been discussing about
+         * changing it.  This needs to be rechecked.
+         */
+        wl->noise = desc->rssi - (desc->snr >> 1);
+
         status->freq = ieee80211_channel_to_frequency(desc->channel);
 
         if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {