[PATCH 04/10] watchdog: Add functions to set the timeout and pretimeout

[minyard@xxxxxxx]

From: Corey Minyard <cminyard@xxxxxxxxxx>

If the watchdog device wants to set it's pretimeout (say from module
parameters), this lets them do that.

Signed-off-by: Corey Minyard <cminyard@xxxxxxxxxx>
---
 drivers/watchdog/watchdog_dev.c | 54 +++++++++++++++++++++++++++++----
 include/linux/watchdog.h        |  4 +++
 2 files changed, 52 insertions(+), 6 deletions(-)

diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 45a0a4fe731d..6c423aed3f3c 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -364,14 +364,14 @@ static unsigned int watchdog_get_status(struct watchdog_device *wdd)
 }
 
 /*
- *	watchdog_set_timeout: set the watchdog timer timeout
+ *	_watchdog_set_timeout: set the watchdog timer timeout
  *	@wdd: the watchdog device to set the timeout for
  *	@timeout: timeout to set in seconds
  *
  *	The caller must hold wd_data->lock.
  */
 
-static int watchdog_set_timeout(struct watchdog_device *wdd,
+static int _watchdog_set_timeout(struct watchdog_device *wdd,
 							unsigned int timeout)
 {
 	int err = 0;
@@ -396,14 +396,35 @@ static int watchdog_set_timeout(struct watchdog_device *wdd,
 	return err;
 }
 
+/*
+ *	watchdog_set_timeout: set the watchdog timer timeout
+ *	@wdd: the watchdog device to set the timeout for
+ *	@timeout: timeout to set in seconds
+ */
+
+int watchdog_set_timeout(struct watchdog_device *wdd, unsigned int timeout)
+{
+	int err = 0;
+
+	if (!wdd->wd_data)
+		return -ENODEV;
+
+	mutex_lock(&wdd->wd_data->lock);
+	err = _watchdog_set_timeout(wdd, timeout);
+	mutex_unlock(&wdd->wd_data->lock);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(watchdog_set_timeout);
+
 /*
  *	watchdog_set_pretimeout: set the watchdog timer pretimeout
  *	@wdd: the watchdog device to set the timeout for
  *	@timeout: pretimeout to set in seconds
  */
 
-static int watchdog_set_pretimeout(struct watchdog_device *wdd,
-				   unsigned int timeout)
+static int _watchdog_set_pretimeout(struct watchdog_device *wdd,
+				    unsigned int timeout)
 {
 	int err = 0;
 
@@ -421,6 +442,27 @@ static int watchdog_set_pretimeout(struct watchdog_device *wdd,
 	return err;
 }
 
+/*
+ *	watchdog_set_pretimeout: set the watchdog timer pretimeout
+ *	@wdd: the watchdog device to set the timeout for
+ *	@timeout: pretimeout to set in seconds
+ */
+
+int watchdog_set_pretimeout(struct watchdog_device *wdd, unsigned int timeout)
+{
+	int err = 0;
+
+	if (!wdd->wd_data)
+		return -ENODEV;
+
+	mutex_lock(&wdd->wd_data->lock);
+	err = _watchdog_set_pretimeout(wdd, timeout);
+	mutex_unlock(&wdd->wd_data->lock);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(watchdog_set_pretimeout);
+
 /*
  *	watchdog_get_timeleft: wrapper to get the time left before a reboot
  *	@wdd: the watchdog device to get the remaining time from
@@ -809,7 +851,7 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
 			err = -EFAULT;
 			break;
 		}
-		err = watchdog_set_timeout(wdd, val);
+		err = _watchdog_set_timeout(wdd, val);
 		if (err < 0)
 			break;
 		/* If the watchdog is active then we send a keepalive ping
@@ -838,7 +880,7 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
 			err = -EFAULT;
 			break;
 		}
-		err = watchdog_set_pretimeout(wdd, val);
+		err = _watchdog_set_pretimeout(wdd, val);
 		break;
 	case WDIOC_GETPRETIMEOUT:
 		err = put_user(wdd->pretimeout, p);
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 36f99c8c973e..95396b644a9b 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -201,6 +201,10 @@ static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
 	return wdd->driver_data;
 }
 
+/* Allow the driver to set the timeout and pretimeout. */
+int watchdog_set_timeout(struct watchdog_device *wdd, unsigned int timeout);
+int watchdog_set_pretimeout(struct watchdog_device *wdd, unsigned int timeout);
+
 /* Use the following functions to report watchdog pretimeout event */
 #if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)
 void watchdog_notify_pretimeout(struct watchdog_device *wdd);
-- 
2.17.1