From 0a9ffac09f772edee60abf3a0fe00f7bb5335c51 Mon Sep 17 00:00:00 2001
From: Nadim Zubidat <nadimz@ti.com>
Date: Tue, 12 Mar 2013 17:19:39 +0200
Subject: [PATCH] wlcore: report rssi from roaming statistics

report the average beacon rssi which is calculated
by firmware for roaming statistics instead of the
last rx packet rssi. this results a more accurate
rssi reporting

Signed-off-by: Nadim Zubidat <nadimz@ti.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
---
 drivers/net/wireless/ti/wlcore/acx.c  | 29 +++++++++++++++++++++++
 drivers/net/wireless/ti/wlcore/acx.h  | 14 +++++++++++
 drivers/net/wireless/ti/wlcore/main.c | 34 +++++++++++++++++++++++++++
 3 files changed, 77 insertions(+)

diff --git a/drivers/net/wireless/ti/wlcore/acx.c b/drivers/net/wireless/ti/wlcore/acx.c
index c79654323396..7a970cd9c555 100644
--- a/drivers/net/wireless/ti/wlcore/acx.c
+++ b/drivers/net/wireless/ti/wlcore/acx.c
@@ -1736,6 +1736,35 @@ int wl12xx_acx_config_hangover(struct wl1271 *wl)
 
 }
 
+int wlcore_acx_average_rssi(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+			    s8 *avg_rssi)
+{
+	struct acx_roaming_stats *acx;
+	int ret = 0;
+
+	wl1271_debug(DEBUG_ACX, "acx roaming statistics");
+
+	acx = kzalloc(sizeof(*acx), GFP_KERNEL);
+	if (!acx) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	acx->role_id = wlvif->role_id;
+	ret = wl1271_cmd_interrogate(wl, ACX_ROAMING_STATISTICS_TBL,
+				     acx, sizeof(*acx));
+	if (ret	< 0) {
+		wl1271_warning("acx roaming statistics failed: %d", ret);
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	*avg_rssi = acx->rssi_beacon;
+out:
+	kfree(acx);
+	return ret;
+}
+
 #ifdef CONFIG_PM
 /* Set the global behaviour of RX filters - On/Off + default action */
 int wl1271_acx_default_rx_filter_enable(struct wl1271 *wl, bool enable,
diff --git a/drivers/net/wireless/ti/wlcore/acx.h b/drivers/net/wireless/ti/wlcore/acx.h
index 1a61e8550b7b..6dcfad9b0472 100644
--- a/drivers/net/wireless/ti/wlcore/acx.h
+++ b/drivers/net/wireless/ti/wlcore/acx.h
@@ -953,6 +953,18 @@ struct acx_rx_filter_cfg {
 	u8 fields[0];
 } __packed;
 
+struct acx_roaming_stats {
+	struct acx_header header;
+
+	u8	role_id;
+	u8	pad[3];
+	u32	missed_beacons;
+	u8	snr_data;
+	u8	snr_bacon;
+	s8	rssi_data;
+	s8	rssi_beacon;
+} __packed;
+
 enum {
 	ACX_WAKE_UP_CONDITIONS           = 0x0000,
 	ACX_MEM_CFG                      = 0x0001,
@@ -1110,6 +1122,8 @@ int wl1271_acx_set_inconnection_sta(struct wl1271 *wl, u8 *addr);
 int wl1271_acx_fm_coex(struct wl1271 *wl);
 int wl12xx_acx_set_rate_mgmt_params(struct wl1271 *wl);
 int wl12xx_acx_config_hangover(struct wl1271 *wl);
+int wlcore_acx_average_rssi(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+			    s8 *avg_rssi);
 
 #ifdef CONFIG_PM
 int wl1271_acx_default_rx_filter_enable(struct wl1271 *wl, bool enable,
diff --git a/drivers/net/wireless/ti/wlcore/main.c b/drivers/net/wireless/ti/wlcore/main.c
index c1a60cdacd04..bf86c71d8888 100644
--- a/drivers/net/wireless/ti/wlcore/main.c
+++ b/drivers/net/wireless/ti/wlcore/main.c
@@ -5094,6 +5094,39 @@ static void wlcore_op_sta_rc_update(struct ieee80211_hw *hw,
 	wlcore_hw_sta_rc_update(wl, wlvif, sta, changed);
 }
 
+static int wlcore_op_get_rssi(struct ieee80211_hw *hw,
+			       struct ieee80211_vif *vif,
+			       struct ieee80211_sta *sta,
+			       s8 *rssi_dbm)
+{
+	struct wl1271 *wl = hw->priv;
+	struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
+	int ret = 0;
+
+	wl1271_debug(DEBUG_MAC80211, "mac80211 get_rssi");
+
+	mutex_lock(&wl->mutex);
+
+	if (unlikely(wl->state != WLCORE_STATE_ON))
+		goto out;
+
+	ret = wl1271_ps_elp_wakeup(wl);
+	if (ret < 0)
+		goto out_sleep;
+
+	ret = wlcore_acx_average_rssi(wl, wlvif, rssi_dbm);
+	if (ret < 0)
+		goto out_sleep;
+
+out_sleep:
+	wl1271_ps_elp_sleep(wl);
+
+out:
+	mutex_unlock(&wl->mutex);
+
+	return ret;
+}
+
 static bool wl1271_tx_frames_pending(struct ieee80211_hw *hw)
 {
 	struct wl1271 *wl = hw->priv;
@@ -5293,6 +5326,7 @@ static const struct ieee80211_ops wl1271_ops = {
 	.assign_vif_chanctx = wlcore_op_assign_vif_chanctx,
 	.unassign_vif_chanctx = wlcore_op_unassign_vif_chanctx,
 	.sta_rc_update = wlcore_op_sta_rc_update,
+	.get_rssi = wlcore_op_get_rssi,
 	CFG80211_TESTMODE_CMD(wl1271_tm_cmd)
 };