staging: mei: adding watchdog ping

adding watchdog ping to send ping/heartbeat to the the AMT watchdog client.
in addition removing the heartbeat sending from the driver timers function.

Signed-off-by: Oren Weil <oren.jer.weil@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/mei/interrupt.c

@@ -1430,33 +1430,6 @@ void mei_wd_timer(struct work_struct *work)
 		}
 	}
 
-	if (dev->wd_cl.state != MEI_FILE_CONNECTED)
-		goto out;
-
-	/* Watchdog */
-	if (dev->wd_due_counter && !dev->wd_bypass) {
-		if (--dev->wd_due_counter == 0) {
-			if (dev->mei_host_buffer_is_empty &&
-			    mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
-				dev->mei_host_buffer_is_empty = false;
-				dev_dbg(&dev->pdev->dev, "send watchdog.\n");
-
-				if (mei_wd_send(dev))
-					dev_dbg(&dev->pdev->dev, "wd send failed.\n");
-				else
-					if (mei_flow_ctrl_reduce(dev, &dev->wd_cl))
-						goto out;
-
-				if (dev->wd_timeout)
-					dev->wd_due_counter = 2;
-				else
-					dev->wd_due_counter = 0;
-
-			} else
-				dev->wd_pending = true;
-
-		}
-	}
 	if (dev->iamthif_stall_timer) {
 		if (--dev->iamthif_stall_timer == 0) {
 			dev_dbg(&dev->pdev->dev, "reseting because of hang to amthi.\n");

drivers/staging/mei/wd.c

@@ -254,16 +254,70 @@ static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
 	return 0;
 }
 
+/*
+ * mei_wd_ops_ping - wd ping command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
+{
+	int ret = 0;
+	struct mei_device *dev;
+	dev = pci_get_drvdata(mei_device);
+
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
+		dev_dbg(&dev->pdev->dev, "wd is not connected.\n");
+		ret = -ENODEV;
+		goto end;
+	}
+
+	/* Check if we can send the ping to HW*/
+	if (dev->mei_host_buffer_is_empty &&
+		mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
+
+		dev->mei_host_buffer_is_empty = false;
+		dev_dbg(&dev->pdev->dev, "sending watchdog ping\n");
+
+		if (mei_wd_send(dev)) {
+			dev_dbg(&dev->pdev->dev, "wd send failed.\n");
+			ret = -EIO;
+			goto end;
+		}
+
+		if (mei_flow_ctrl_reduce(dev, &dev->wd_cl)) {
+			dev_dbg(&dev->pdev->dev, "mei_flow_ctrl_reduce() failed.\n");
+			ret = -EIO;
+			goto end;
+		}
+
+	} else {
+		dev->wd_pending = true;
+	}
+
+end:
+	mutex_unlock(&dev->device_lock);
+	return ret;
+}
+
 /*
  * Watchdog Device structs
  */
 const struct watchdog_ops wd_ops = {
 		.owner = THIS_MODULE,
 		.start = mei_wd_ops_start,
 		.stop = mei_wd_ops_stop,
+		.ping = mei_wd_ops_ping,
 };
 const struct watchdog_info wd_info = {
 		.identity = INTEL_AMT_WATCHDOG_ID,
+		.options = WDIOF_KEEPALIVEPING,
 };
 
 struct watchdog_device amt_wd_dev = {