wl1271: Go to ELP in idle

Allow the wl1271 go to ELP mode also in idle. This will reduce current
consumption remarkably in idle mode (~12mA -> ~0.2mA)

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271.h

@@ -374,6 +374,7 @@ struct wl1271 {
 #define WL1271_FLAG_PSM_REQUESTED      (8)
 #define WL1271_FLAG_IRQ_PENDING        (9)
 #define WL1271_FLAG_IRQ_RUNNING       (10)
+#define WL1271_FLAG_IDLE              (11)
 	unsigned long flags;
 
 	struct wl1271_partition_set part;

drivers/net/wireless/wl12xx/wl1271_main.c

@@ -1272,7 +1272,9 @@ static int wl1271_op_config(struct ieee80211_hw *hw, u32 changed)
 			wl1271_acx_keep_alive_config(
 				wl, CMD_TEMPL_KLV_IDX_NULL_DATA,
 				ACX_KEEP_ALIVE_TPL_INVALID);
-		}
+			set_bit(WL1271_FLAG_IDLE, &wl->flags);
+		} else
+			clear_bit(WL1271_FLAG_IDLE, &wl->flags);
 	}
 
 	if (conf->flags & IEEE80211_CONF_PS &&

drivers/net/wireless/wl12xx/wl1271_ps.c

@@ -40,7 +40,8 @@ void wl1271_elp_work(struct work_struct *work)
 	mutex_lock(&wl->mutex);
 
 	if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
-	    !test_bit(WL1271_FLAG_PSM, &wl->flags))
+	    (!test_bit(WL1271_FLAG_PSM, &wl->flags) &&
+	     !test_bit(WL1271_FLAG_IDLE, &wl->flags)))
 		goto out;
 
 	wl1271_debug(DEBUG_PSM, "chip to elp");
@@ -56,7 +57,8 @@ void wl1271_elp_work(struct work_struct *work)
 /* Routines to toggle sleep mode while in ELP */
 void wl1271_ps_elp_sleep(struct wl1271 *wl)
 {
-	if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
+	if (test_bit(WL1271_FLAG_PSM, &wl->flags) ||
+	    test_bit(WL1271_FLAG_IDLE, &wl->flags)) {
 		cancel_delayed_work(&wl->elp_work);
 		ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
 					msecs_to_jiffies(ELP_ENTRY_DELAY));