1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index ba795a4db1e9..7bbc26a34bd2 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -117,4 +117,85 @@ int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
 }
 EXPORT_SYMBOL(rtc_tm_to_time);
 
+
+/* Merge the valid (i.e. non-negative) fields of alarm into the current
+ * time.  If the valid alarm fields are earlier than the equivalent
+ * fields in the time, carry one into the least significant invalid
+ * field, so that the alarm expiry is in the future.  It assumes that the
+ * least significant invalid field is more significant than the most
+ * significant valid field, and that the seconds field is valid.
+ *
+ * This is used by alarms that take relative (rather than absolute)
+ * times, and/or have a simple binary second counter instead of
+ * day/hour/minute/sec registers.
+ */
+void rtc_merge_alarm(struct rtc_time *now, struct rtc_time *alarm)
+{
+	int *alarmp = &alarm->tm_sec;
+	int *timep = &now->tm_sec;
+	int carry_into, i;
+
+	/* Ignore everything past the 6th element (tm_year). */
+	for (i = 5; i > 0; i--) {
+		if (alarmp[i] < 0)
+			alarmp[i] = timep[i];
+		else
+			break;
+	}
+
+	/* No carry needed if all fields are valid. */
+	if (i == 5)
+		return;
+
+	for (carry_into = i + 1; i >= 0; i--) {
+		if (alarmp[i] < timep[i])
+			break;
+
+		if (alarmp[i] > timep[i])
+			return;
+	}
+
+	switch (carry_into) {
+		case 1:
+			alarm->tm_min++;
+
+			if (alarm->tm_min < 60)
+				return;
+
+			alarm->tm_min = 0;
+			/* fall-through */
+
+		case 2:
+			alarm->tm_hour++;
+
+			if (alarm->tm_hour < 60)
+				return;
+
+			alarm->tm_hour = 0;
+			/* fall-through */
+
+		case 3:
+			alarm->tm_mday++;
+
+			if (alarm->tm_mday <= rtc_days_in_month[alarm->tm_mon])
+				return;
+
+			alarm->tm_mday = 1;
+			/* fall-through */
+
+		case 4:
+			alarm->tm_mon++;
+
+			if (alarm->tm_mon <= 12)
+				return;
+
+			alarm->tm_mon = 1;
+			/* fall-through */
+
+		case 5:
+			alarm->tm_year++;
+	}
+}
+EXPORT_SYMBOL(rtc_merge_alarm);
+
 MODULE_LICENSE("GPL");