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path: root/drivers/rtc/rtc-lib.c
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-rw-r--r--drivers/rtc/rtc-lib.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index ba795a4db1e..7bbc26a34bd 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");