5 files changed, 107 insertions, 1 deletions

diff --git a/drivers/net/wireless/wl1251/acx.c b/drivers/net/wireless/wl1251/acx.c
index 8c94366..ef8370e 100644
--- a/drivers/net/wireless/wl1251/acx.c
+++ b/drivers/net/wireless/wl1251/acx.c
@@ -776,6 +776,31 @@ out:
 	return ret;
 }
 
+int wl1251_acx_low_rssi(struct wl1251 *wl, s8 threshold, u8 weight,
+			u8 depth, enum wl1251_acx_low_rssi_type type)
+{
+	struct acx_low_rssi *rssi;
+	int ret;
+
+	wl1251_debug(DEBUG_ACX, "acx low rssi");
+
+	rssi = kzalloc(sizeof(*rssi), GFP_KERNEL);
+	if (!rssi)
+		return -ENOMEM;
+
+	rssi->threshold = threshold;
+	rssi->weight = weight;
+	rssi->depth = depth;
+	rssi->type = type;
+
+	ret = wl1251_cmd_configure(wl, ACX_LOW_RSSI, rssi, sizeof(*rssi));
+	if (ret < 0)
+		wl1251_warning("failed to set low rssi threshold: %d", ret);
+
+	kfree(rssi);
+	return ret;
+}
+
 int wl1251_acx_set_preamble(struct wl1251 *wl, enum acx_preamble_type preamble)
 {
 	struct acx_preamble *acx;
diff --git a/drivers/net/wireless/wl1251/acx.h b/drivers/net/wireless/wl1251/acx.h
index 6a19f38..c2ba100 100644
--- a/drivers/net/wireless/wl1251/acx.h
+++ b/drivers/net/wireless/wl1251/acx.h
@@ -399,6 +399,49 @@ struct acx_rts_threshold {
 	u8 pad[2];
 } __packed;
 
+enum wl1251_acx_low_rssi_type {
+	/*
+	 * The event is a "Level" indication which keeps triggering
+	 * as long as the average RSSI is below the threshold.
+	 */
+	WL1251_ACX_LOW_RSSI_TYPE_LEVEL = 0,
+
+	/*
+	 * The event is an "Edge" indication which triggers
+	 * only when the RSSI threshold is crossed from above.
+	 */
+	WL1251_ACX_LOW_RSSI_TYPE_EDGE = 1,
+};
+
+struct acx_low_rssi {
+	struct acx_header header;
+
+	/*
+	 * The threshold (in dBm) below (or above after low rssi
+	 * indication) which the firmware generates an interrupt to the
+	 * host. This parameter is signed.
+	 */
+	s8 threshold;
+
+	/*
+	 * The weight of the current RSSI sample, before adding the new
+	 * sample, that is used to calculate the average RSSI.
+	 */
+	u8 weight;
+
+	/*
+	 * The number of Beacons/Probe response frames that will be
+	 * received before issuing the Low or Regained RSSI event.
+	 */
+	u8 depth;
+
+	/*
+	 * Configures how the Low RSSI Event is triggered. Refer to
+	 * enum wl1251_acx_low_rssi_type for more.
+	 */
+	u8 type;
+} __packed;
+
 struct acx_beacon_filter_option {
 	struct acx_header header;
 
@@ -1418,6 +1461,8 @@ int wl1251_acx_cca_threshold(struct wl1251 *wl);
 int wl1251_acx_bcn_dtim_options(struct wl1251 *wl);
 int wl1251_acx_aid(struct wl1251 *wl, u16 aid);
 int wl1251_acx_event_mbox_mask(struct wl1251 *wl, u32 event_mask);
+int wl1251_acx_low_rssi(struct wl1251 *wl, s8 threshold, u8 weight,
+			u8 depth, enum wl1251_acx_low_rssi_type type);
 int wl1251_acx_set_preamble(struct wl1251 *wl, enum acx_preamble_type preamble);
 int wl1251_acx_cts_protect(struct wl1251 *wl,
 			    enum acx_ctsprotect_type ctsprotect);
diff --git a/drivers/net/wireless/wl1251/event.c b/drivers/net/wireless/wl1251/event.c
index 712372e..dfc4579 100644
--- a/drivers/net/wireless/wl1251/event.c
+++ b/drivers/net/wireless/wl1251/event.c
@@ -90,6 +90,24 @@ static int wl1251_event_process(struct wl1251 *wl, struct event_mailbox *mbox)
 		}
 	}
 
+	if (wl->vif && wl->rssi_thold) {
+		if (vector & ROAMING_TRIGGER_LOW_RSSI_EVENT_ID) {
+			wl1251_debug(DEBUG_EVENT,
+				     "ROAMING_TRIGGER_LOW_RSSI_EVENT");
+			ieee80211_cqm_rssi_notify(wl->vif,
+				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
+				GFP_KERNEL);
+		}
+
+		if (vector & ROAMING_TRIGGER_REGAINED_RSSI_EVENT_ID) {
+			wl1251_debug(DEBUG_EVENT,
+				     "ROAMING_TRIGGER_REGAINED_RSSI_EVENT");
+			ieee80211_cqm_rssi_notify(wl->vif,
+				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
+				GFP_KERNEL);
+		}
+	}
+
 	return 0;
 }
 
diff --git a/drivers/net/wireless/wl1251/main.c b/drivers/net/wireless/wl1251/main.c
index 012e1a4..0325643 100644
--- a/drivers/net/wireless/wl1251/main.c
+++ b/drivers/net/wireless/wl1251/main.c
@@ -502,6 +502,7 @@ static void wl1251_op_stop(struct ieee80211_hw *hw)
 	wl->psm = 0;
 	wl->tx_queue_stopped = false;
 	wl->power_level = WL1251_DEFAULT_POWER_LEVEL;
+	wl->rssi_thold = 0;
 	wl->channel = WL1251_DEFAULT_CHANNEL;
 
 	wl1251_debugfs_reset(wl);
@@ -959,6 +960,16 @@ static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
 	if (ret < 0)
 		goto out;
 
+	if (changed & BSS_CHANGED_CQM) {
+		ret = wl1251_acx_low_rssi(wl, bss_conf->cqm_rssi_thold,
+					  WL1251_DEFAULT_LOW_RSSI_WEIGHT,
+					  WL1251_DEFAULT_LOW_RSSI_DEPTH,
+					  WL1251_ACX_LOW_RSSI_TYPE_EDGE);
+		if (ret < 0)
+			goto out;
+		wl->rssi_thold = bss_conf->cqm_rssi_thold;
+	}
+
 	if (changed & BSS_CHANGED_BSSID) {
 		memcpy(wl->bssid, bss_conf->bssid, ETH_ALEN);
 
@@ -1310,7 +1321,8 @@ int wl1251_init_ieee80211(struct wl1251 *wl)
 	wl->hw->flags = IEEE80211_HW_SIGNAL_DBM |
 		IEEE80211_HW_SUPPORTS_PS |
 		IEEE80211_HW_BEACON_FILTER |
-		IEEE80211_HW_SUPPORTS_UAPSD;
+		IEEE80211_HW_SUPPORTS_UAPSD |
+		IEEE80211_HW_SUPPORTS_CQM_RSSI;
 
 	wl->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 	wl->hw->wiphy->max_scan_ssids = 1;
@@ -1374,6 +1386,7 @@ struct ieee80211_hw *wl1251_alloc_hw(void)
 	wl->psm_requested = false;
 	wl->tx_queue_stopped = false;
 	wl->power_level = WL1251_DEFAULT_POWER_LEVEL;
+	wl->rssi_thold = 0;
 	wl->beacon_int = WL1251_DEFAULT_BEACON_INT;
 	wl->dtim_period = WL1251_DEFAULT_DTIM_PERIOD;
 	wl->vif = NULL;
diff --git a/drivers/net/wireless/wl1251/wl1251.h b/drivers/net/wireless/wl1251/wl1251.h
index 462ac5b..bb23cd5 100644
--- a/drivers/net/wireless/wl1251/wl1251.h
+++ b/drivers/net/wireless/wl1251/wl1251.h
@@ -370,6 +370,8 @@ struct wl1251 {
 	/* in dBm */
 	int power_level;
 
+	int rssi_thold;
+
 	struct wl1251_stats stats;
 	struct wl1251_debugfs debugfs;
 
@@ -433,4 +435,7 @@ void wl1251_disable_interrupts(struct wl1251 *wl);
 #define WL1251_PART_WORK_REG_START	REGISTERS_BASE
 #define WL1251_PART_WORK_REG_SIZE	REGISTERS_WORK_SIZE
 
+#define WL1251_DEFAULT_LOW_RSSI_WEIGHT          10
+#define WL1251_DEFAULT_LOW_RSSI_DEPTH           10
+
 #endif