Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx>
---
drivers/rtc/rtc-lib.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/rtc.h | 1 +
2 files changed, 46 insertions(+)
diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index 0d6acde..1b23458 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -39,6 +39,51 @@ int rtc_month_days(unsigned int month, unsigned int year)
EXPORT_SYMBOL(rtc_month_days);
/*
+ * Convert seconds since 01-01-1970 00:00:00 to Gregorian date.
+ */
+void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
+{
+ unsigned int month, year;
+ int days;
+
+ days = time / 86400;
+ time -= (unsigned int) days * 86400;
+
+ /* day of the week, 1970-01-01 was a Thursday */
+ tm->tm_wday = (days + 4) % 7;
+
+ year = 1970 + days / 365;
+ days -= (year - 1970) * 365
+ + LEAPS_THRU_END_OF(year - 1)
+ - LEAPS_THRU_END_OF(1970 - 1);
+ if (days < 0) {
+ year -= 1;
+ days += 365 + is_leap_year(year);
+ }
+ tm->tm_year = year - 1900;
+ tm->tm_yday = days + 1;
+
+ for (month = 0; month < 11; month++) {
+ int newdays;
+
+ newdays = days - rtc_month_days(month, year);
+ if (newdays < 0)
+ break;
+ days = newdays;
+ }
+ tm->tm_mon = month;
+ tm->tm_mday = days + 1;
+
+ tm->tm_hour = time / 3600;
+ time -= tm->tm_hour * 3600;
+ tm->tm_min = time / 60;
+ tm->tm_sec = time - tm->tm_min * 60;
+
+ tm->tm_isdst = 0;
+}
+EXPORT_SYMBOL(rtc_time_to_tm);
+
+/*
* Does the rtc_time represent a valid date/time?
*/
int rtc_valid_tm(struct rtc_time *tm)
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 2e034f6..2dacb14 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -17,6 +17,7 @@
extern int rtc_month_days(unsigned int month, unsigned int year);
extern int rtc_valid_tm(struct rtc_time *tm);
extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
+extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
struct rtc_class_ops;
--
2.0.1
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