1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/watchdog/watchdog_hrtimer_pretimeout.c b/drivers/watchdog/watchdog_hrtimer_pretimeout.c
new file mode 100644
index 000000000..940b53718
--- /dev/null
+++ b/drivers/watchdog/watchdog_hrtimer_pretimeout.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (c) Copyright 2021 Hewlett Packard Enterprise Development LP.
+ */
+
+#include <linux/hrtimer.h>
+#include <linux/watchdog.h>
+
+#include "watchdog_core.h"
+#include "watchdog_pretimeout.h"
+
+static enum hrtimer_restart watchdog_hrtimer_pretimeout(struct hrtimer *timer)
+{
+	struct watchdog_core_data *wd_data;
+
+	wd_data = container_of(timer, struct watchdog_core_data, pretimeout_timer);
+
+	watchdog_notify_pretimeout(wd_data->wdd);
+	return HRTIMER_NORESTART;
+}
+
+void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd)
+{
+	struct watchdog_core_data *wd_data = wdd->wd_data;
+
+	hrtimer_init(&wd_data->pretimeout_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	wd_data->pretimeout_timer.function = watchdog_hrtimer_pretimeout;
+}
+
+void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd)
+{
+	if (!(wdd->info->options & WDIOF_PRETIMEOUT) &&
+	    !watchdog_pretimeout_invalid(wdd, wdd->pretimeout))
+		hrtimer_start(&wdd->wd_data->pretimeout_timer,
+			      ktime_set(wdd->timeout - wdd->pretimeout, 0),
+			      HRTIMER_MODE_REL);
+	else
+		hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
+}
+
+void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd)
+{
+	hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
+}