rtc: use set_mmss when set_time is not available

Drivers should only need to implement either set_mmss (counter based RTCs)
or set_time (most RTCs). The RTC subsystem will handle them
appropriately.

Signed-off-by: Alessandro Zummo <[e-mail]>
Cc: Kumar Gala <[e-mail]>
Cc: David Brownell <[e-mail]>
Cc: Lennert Buytenhek <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/rtc/interface.c

···
 
 	if (!rtc->ops)
 		err = -ENODEV;
-	else if (!rtc->ops->set_time)
-		err = -EINVAL;
-	else
+	else if (rtc->ops->set_time)
 		err = rtc->ops->set_time(rtc->dev.parent, tm);
+	else if (rtc->ops->set_mmss) {
+		unsigned long secs;
+		err = rtc_tm_to_time(tm, &secs);
+		if (err == 0)
+			err = rtc->ops->set_mmss(rtc->dev.parent, secs);
+	} else
+		err = -EINVAL;
 
 	mutex_unlock(&rtc->ops_lock);
 	return err;

drivers/rtc/rtc-ds1672.c

···
 	return 0;
 }
 
-static int ds1672_set_datetime(struct i2c_client *client, struct rtc_time *tm)
-{
-	unsigned long secs;
-
-	dev_dbg(&client->dev,
-		"%s: secs=%d, mins=%d, hours=%d, "
-		"mday=%d, mon=%d, year=%d, wday=%d\n",
-		__func__,
-		tm->tm_sec, tm->tm_min, tm->tm_hour,
-		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
-
-	rtc_tm_to_time(tm, &secs);
-
-	return ds1672_set_mmss(client, secs);
-}
-
 static int ds1672_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	return ds1672_get_datetime(to_i2c_client(dev), tm);
-}
-
-static int ds1672_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
-	return ds1672_set_datetime(to_i2c_client(dev), tm);
 }
 
 static int ds1672_rtc_set_mmss(struct device *dev, unsigned long secs)
···
 
 static const struct rtc_class_ops ds1672_rtc_ops = {
 	.read_time = ds1672_rtc_read_time,
-	.set_time = ds1672_rtc_set_time,
 	.set_mmss = ds1672_rtc_set_mmss,
 };
 

drivers/rtc/rtc-ep93xx.c

···
 	return 0;
 }
 
-static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
-	int err;
-	unsigned long secs;
-
-	err = rtc_tm_to_time(tm, &secs);
-	if (err != 0)
-		return err;
-
-	return ep93xx_rtc_set_mmss(dev, secs);
-}
-
 static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
 {
 	unsigned short preload, delete;
···
 
 static const struct rtc_class_ops ep93xx_rtc_ops = {
 	.read_time	= ep93xx_rtc_read_time,
-	.set_time	= ep93xx_rtc_set_time,
 	.set_mmss	= ep93xx_rtc_set_mmss,
 	.proc		= ep93xx_rtc_proc,
 };

drivers/rtc/rtc-test.c

···
 	return 0;
 }
 
-static int test_rtc_set_time(struct device *dev,
-	struct rtc_time *tm)
-{
-	return 0;
-}
-
 static int test_rtc_set_mmss(struct device *dev, unsigned long secs)
 {
+	dev_info(dev, "%s, secs = %lu\n", __func__, secs);
 	return 0;
 }
 
···
 static const struct rtc_class_ops test_rtc_ops = {
 	.proc = test_rtc_proc,
 	.read_time = test_rtc_read_time,
-	.set_time = test_rtc_set_time,
 	.read_alarm = test_rtc_read_alarm,
 	.set_alarm = test_rtc_set_alarm,
 	.set_mmss = test_rtc_set_mmss,