+static inline int rtc_periodic_alarm(struct rtc_time *tm)
+{
+ return (tm->tm_year == -1) ||
+ ((unsigned)tm->tm_mon >= 12) ||
+ ((unsigned)(tm->tm_mday - 1) >= 31) ||
+ ((unsigned)tm->tm_hour > 23) ||
+ ((unsigned)tm->tm_min > 59) ||
+ ((unsigned)tm->tm_sec > 59);
+}
+
+/*
+ * Calculate the next alarm time given the requested alarm time mask
+ * and the current time.
+ */
+static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, struct rtc_time *alrm)
+{
+ unsigned long next_time;
+ unsigned long now_time;
+
+ next->tm_year = now->tm_year;
+ next->tm_mon = now->tm_mon;
+ next->tm_mday = now->tm_mday;
+ next->tm_hour = alrm->tm_hour;
+ next->tm_min = alrm->tm_min;
+ next->tm_sec = alrm->tm_sec;
+
+ rtc_tm_to_time(now, &now_time);
+ rtc_tm_to_time(next, &next_time);
+
+ if (next_time < now_time) {
+ /* Advance one day */
+ next_time += 60 * 60 * 24;
+ rtc_time_to_tm(next_time, next);
+ }
+}
+