libertas: Add auto deep sleep support for SD8385/SD8686/SD8688

Add timer based auto deep sleep feature in libertas driver which can be
configured using iwconfig command. This is tested on SD8688, SD8686 cards
with firmware versions 10.38.1.p25, 9.70.4.p0 respectively on 32-bit and 64-bit
platforms. Tests have been done for USB/CS cards to make sure that the patch
won't break USB/CS code. We didn't test the if_spi driver.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 97 insertions, 14 deletions

diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 87b4e497faa..9b2a9174a01 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -574,8 +574,10 @@ void lbs_host_to_card_done(struct lbs_private *priv)
 	priv->dnld_sent = DNLD_RES_RECEIVED;
 
 	/* Wake main thread if commands are pending */
-	if (!priv->cur_cmd || priv->tx_pending_len > 0)
-		wake_up_interruptible(&priv->waitq);
+	if (!priv->cur_cmd || priv->tx_pending_len > 0) {
+		if (!priv->wakeup_dev_required)
+			wake_up_interruptible(&priv->waitq);
+	}
 
 	spin_unlock_irqrestore(&priv->driver_lock, flags);
 	lbs_deb_leave(LBS_DEB_THREAD);
@@ -770,7 +772,8 @@ static int lbs_thread(void *data)
 			shouldsleep = 0;	/* We have a command response */
 		else if (priv->cur_cmd)
 			shouldsleep = 1;	/* Can't send a command; one already running */
-		else if (!list_empty(&priv->cmdpendingq))
+		else if (!list_empty(&priv->cmdpendingq) &&
+					!(priv->wakeup_dev_required))
 			shouldsleep = 0;	/* We have a command to send */
 		else if (__kfifo_len(priv->event_fifo))
 			shouldsleep = 0;	/* We have an event to process */
@@ -822,6 +825,26 @@ static int lbs_thread(void *data)
 		}
 		spin_unlock_irq(&priv->driver_lock);
 
+		/* Process hardware events, e.g. card removed, link lost */
+		spin_lock_irq(&priv->driver_lock);
+		while (__kfifo_len(priv->event_fifo)) {
+			u32 event;
+			__kfifo_get(priv->event_fifo, (unsigned char *) &event,
+				sizeof(event));
+			spin_unlock_irq(&priv->driver_lock);
+			lbs_process_event(priv, event);
+			spin_lock_irq(&priv->driver_lock);
+		}
+		spin_unlock_irq(&priv->driver_lock);
+
+		if (priv->wakeup_dev_required) {
+			lbs_deb_thread("Waking up device...\n");
+			/* Wake up device */
+			if (priv->exit_deep_sleep(priv))
+				lbs_deb_thread("Wakeup device failed\n");
+			continue;
+		}
+
 		/* command timeout stuff */
 		if (priv->cmd_timed_out && priv->cur_cmd) {
 			struct cmd_ctrl_node *cmdnode = priv->cur_cmd;
@@ -849,18 +872,7 @@ static int lbs_thread(void *data)
 		}
 		priv->cmd_timed_out = 0;
 
-		/* Process hardware events, e.g. card removed, link lost */
-		spin_lock_irq(&priv->driver_lock);
-		while (__kfifo_len(priv->event_fifo)) {
-			u32 event;
 
-			__kfifo_get(priv->event_fifo, (unsigned char *) &event,
-				sizeof(event));
-			spin_unlock_irq(&priv->driver_lock);
-			lbs_process_event(priv, event);
-			spin_lock_irq(&priv->driver_lock);
-		}
-		spin_unlock_irq(&priv->driver_lock);
 
 		if (!priv->fw_ready)
 			continue;
@@ -894,6 +906,9 @@ static int lbs_thread(void *data)
 		    (priv->psstate == PS_STATE_PRE_SLEEP))
 			continue;
 
+		if (priv->is_deep_sleep)
+			continue;
+
 		/* Execute the next command */
 		if (!priv->dnld_sent && !priv->cur_cmd)
 			lbs_execute_next_command(priv);
@@ -928,6 +943,7 @@ static int lbs_thread(void *data)
 	}
 
 	del_timer(&priv->command_timer);
+	del_timer(&priv->auto_deepsleep_timer);
 	wake_up_all(&priv->cmd_pending);
 
 	lbs_deb_leave(LBS_DEB_THREAD);
@@ -1050,6 +1066,60 @@ out:
 	lbs_deb_leave(LBS_DEB_CMD);
 }
 
+/**
+ *  This function put the device back to deep sleep mode when timer expires
+ *  and no activity (command, event, data etc.) is detected.
+ */
+static void auto_deepsleep_timer_fn(unsigned long data)
+{
+	struct lbs_private *priv = (struct lbs_private *)data;
+	int ret;
+
+	lbs_deb_enter(LBS_DEB_CMD);
+
+	if (priv->is_activity_detected) {
+		priv->is_activity_detected = 0;
+	} else {
+		if (priv->is_auto_deep_sleep_enabled &&
+				(!priv->wakeup_dev_required) &&
+				(priv->connect_status != LBS_CONNECTED)) {
+			lbs_deb_main("Entering auto deep sleep mode...\n");
+			ret = lbs_prepare_and_send_command(priv,
+					CMD_802_11_DEEP_SLEEP, 0,
+					0, 0, NULL);
+		}
+	}
+	mod_timer(&priv->auto_deepsleep_timer , jiffies +
+				(priv->auto_deep_sleep_timeout * HZ)/1000);
+	lbs_deb_leave(LBS_DEB_CMD);
+}
+
+int lbs_enter_auto_deep_sleep(struct lbs_private *priv)
+{
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	priv->is_auto_deep_sleep_enabled = 1;
+	if (priv->is_deep_sleep)
+		priv->wakeup_dev_required = 1;
+	mod_timer(&priv->auto_deepsleep_timer ,
+			jiffies + (priv->auto_deep_sleep_timeout * HZ)/1000);
+
+	lbs_deb_leave(LBS_DEB_SDIO);
+	return 0;
+}
+
+int lbs_exit_auto_deep_sleep(struct lbs_private *priv)
+{
+	lbs_deb_enter(LBS_DEB_SDIO);
+
+	priv->is_auto_deep_sleep_enabled = 0;
+	priv->auto_deep_sleep_timeout = 0;
+	del_timer(&priv->auto_deepsleep_timer);
+
+	lbs_deb_leave(LBS_DEB_SDIO);
+	return 0;
+}
+
 static void lbs_sync_channel_worker(struct work_struct *work)
 {
 	struct lbs_private *priv = container_of(work, struct lbs_private,
@@ -1099,11 +1169,17 @@ static int lbs_init_adapter(struct lbs_private *priv)
 	priv->capability = WLAN_CAPABILITY_SHORT_PREAMBLE;
 	priv->psmode = LBS802_11POWERMODECAM;
 	priv->psstate = PS_STATE_FULL_POWER;
+	priv->is_deep_sleep = 0;
+	priv->is_auto_deep_sleep_enabled = 0;
+	priv->wakeup_dev_required = 0;
+	init_waitqueue_head(&priv->ds_awake_q);
 
 	mutex_init(&priv->lock);
 
 	setup_timer(&priv->command_timer, command_timer_fn,
 		(unsigned long)priv);
+	setup_timer(&priv->auto_deepsleep_timer, auto_deepsleep_timer_fn,
+			(unsigned long)priv);
 
 	INIT_LIST_HEAD(&priv->cmdfreeq);
 	INIT_LIST_HEAD(&priv->cmdpendingq);
@@ -1142,6 +1218,7 @@ static void lbs_free_adapter(struct lbs_private *priv)
 	if (priv->event_fifo)
 		kfifo_free(priv->event_fifo);
 	del_timer(&priv->command_timer);
+	del_timer(&priv->auto_deepsleep_timer);
 	kfree(priv->networks);
 	priv->networks = NULL;
 
@@ -1272,6 +1349,11 @@ void lbs_remove_card(struct lbs_private *priv)
 	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 	wireless_send_event(priv->dev, SIOCGIWAP, &wrqu, NULL);
 
+	if (priv->is_deep_sleep) {
+		priv->is_deep_sleep = 0;
+		wake_up_interruptible(&priv->ds_awake_q);
+	}
+
 	/* Stop the thread servicing the interrupts */
 	priv->surpriseremoved = 1;
 	kthread_stop(priv->main_thread);
@@ -1392,6 +1474,7 @@ void lbs_stop_card(struct lbs_private *priv)
 
 	/* Delete the timeout of the currently processing command */
 	del_timer_sync(&priv->command_timer);
+	del_timer_sync(&priv->auto_deepsleep_timer);
 
 	/* Flush pending command nodes */
 	spin_lock_irqsave(&priv->driver_lock, flags);