[rtc-linux] [PATCH 3/4] rtc-rx8025: round up to nearest minute for a minute accuracy alarm

[Akinobu Mita <akinobu.mita@gmail.com>]

The alarm for rx8025 only has a minute accuracy, so round up to nearest
minute when setting alarm.  Without doing this, rtctest blocks one day
after setting alarm to 5 seconds later.

pcf8563 and hym8563 also have similar handling.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-rx8025.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c
index e667f01..23fe242 100644
--- a/drivers/rtc/rtc-rx8025.c
+++ b/drivers/rtc/rtc-rx8025.c
@@ -345,7 +345,17 @@ static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	if (client->irq <= 0)
 		return -EINVAL;
 
-	/* Hardware alarm precision is 1 minute! */
+	/*
+	 * Hardware alarm precision is 1 minute!
+	 * round up to nearest minute
+	 */
+	if (t->time.tm_sec) {
+		time64_t alarm_time = rtc_tm_to_time64(&t->time);
+
+		alarm_time += 60 - t->time.tm_sec;
+		rtc_time64_to_tm(alarm_time, &t->time);
+	}
+
 	ald[0] = bin2bcd(t->time.tm_min);
 	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
 		ald[1] = bin2bcd(t->time.tm_hour);
-- 
2.5.0

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