v4.19.13 snapshot.
diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
new file mode 100644
index 0000000..0760ca1
--- /dev/null
+++ b/include/linux/alarmtimer.h
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_ALARMTIMER_H
+#define _LINUX_ALARMTIMER_H
+
+#include <linux/time.h>
+#include <linux/hrtimer.h>
+#include <linux/timerqueue.h>
+#include <linux/rtc.h>
+
+enum alarmtimer_type {
+ ALARM_REALTIME,
+ ALARM_BOOTTIME,
+
+ /* Supported types end here */
+ ALARM_NUMTYPE,
+
+ /* Used for tracing information. No usable types. */
+ ALARM_REALTIME_FREEZER,
+ ALARM_BOOTTIME_FREEZER,
+};
+
+enum alarmtimer_restart {
+ ALARMTIMER_NORESTART,
+ ALARMTIMER_RESTART,
+};
+
+
+#define ALARMTIMER_STATE_INACTIVE 0x00
+#define ALARMTIMER_STATE_ENQUEUED 0x01
+
+/**
+ * struct alarm - Alarm timer structure
+ * @node: timerqueue node for adding to the event list this value
+ * also includes the expiration time.
+ * @timer: hrtimer used to schedule events while running
+ * @function: Function pointer to be executed when the timer fires.
+ * @type: Alarm type (BOOTTIME/REALTIME).
+ * @state: Flag that represents if the alarm is set to fire or not.
+ * @data: Internal data value.
+ */
+struct alarm {
+ struct timerqueue_node node;
+ struct hrtimer timer;
+ enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
+ enum alarmtimer_type type;
+ int state;
+ void *data;
+};
+
+void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
+ enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
+void alarm_start(struct alarm *alarm, ktime_t start);
+void alarm_start_relative(struct alarm *alarm, ktime_t start);
+void alarm_restart(struct alarm *alarm);
+int alarm_try_to_cancel(struct alarm *alarm);
+int alarm_cancel(struct alarm *alarm);
+
+u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
+u64 alarm_forward_now(struct alarm *alarm, ktime_t interval);
+ktime_t alarm_expires_remaining(const struct alarm *alarm);
+
+/* Provide way to access the rtc device being used by alarmtimers */
+struct rtc_device *alarmtimer_get_rtcdev(void);
+
+#endif