1 files changed, 31 insertions, 82 deletions

diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index 7bbc26a34bd..c4cf0573111 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -26,14 +26,13 @@ static const unsigned short rtc_ydays[2][13] = {
 };
 
 #define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400)
-#define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400))
 
 /*
  * The number of days in the month.
  */
 int rtc_month_days(unsigned int month, unsigned int year)
 {
-	return rtc_days_in_month[month] + (LEAP_YEAR(year) && month == 1);
+	return rtc_days_in_month[month] + (is_leap_year(year) && month == 1);
 }
 EXPORT_SYMBOL(rtc_month_days);
 
@@ -42,7 +41,7 @@ EXPORT_SYMBOL(rtc_month_days);
  */
 int rtc_year_days(unsigned int day, unsigned int month, unsigned int year)
 {
-	return rtc_ydays[LEAP_YEAR(year)][month] + day-1;
+	return rtc_ydays[is_leap_year(year)][month] + day-1;
 }
 EXPORT_SYMBOL(rtc_year_days);
 
@@ -51,10 +50,11 @@ EXPORT_SYMBOL(rtc_year_days);
  */
 void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
 {
-	register int days, month, year;
+	unsigned int month, year;
+	int days;
 
 	days = time / 86400;
-	time -= days * 86400;
+	time -= (unsigned int) days * 86400;
 
 	/* day of the week, 1970-01-01 was a Thursday */
 	tm->tm_wday = (days + 4) % 7;
@@ -65,7 +65,7 @@ void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
 		- LEAPS_THRU_END_OF(1970 - 1);
 	if (days < 0) {
 		year -= 1;
-		days += 365 + LEAP_YEAR(year);
+		days += 365 + is_leap_year(year);
 	}
 	tm->tm_year = year - 1900;
 	tm->tm_yday = days + 1;
@@ -85,6 +85,8 @@ void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
 	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);
 
@@ -117,85 +119,32 @@ 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.
+/*
+ * Convert rtc_time to ktime
  */
-void rtc_merge_alarm(struct rtc_time *now, struct rtc_time *alarm)
+ktime_t rtc_tm_to_ktime(struct rtc_time tm)
 {
-	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 */
+	time_t time;
+	rtc_tm_to_time(&tm, &time);
+	return ktime_set(time, 0);
+}
+EXPORT_SYMBOL_GPL(rtc_tm_to_ktime);
 
-		case 5:
-			alarm->tm_year++;
-	}
+/*
+ * Convert ktime to rtc_time
+ */
+struct rtc_time rtc_ktime_to_tm(ktime_t kt)
+{
+	struct timespec ts;
+	struct rtc_time ret;
+
+	ts = ktime_to_timespec(kt);
+	/* Round up any ns */
+	if (ts.tv_nsec)
+		ts.tv_sec++;
+	rtc_time_to_tm(ts.tv_sec, &ret);
+	return ret;
 }
-EXPORT_SYMBOL(rtc_merge_alarm);
+EXPORT_SYMBOL_GPL(rtc_ktime_to_tm);
 
 MODULE_LICENSE("GPL");