rtc: Add RTC range
Add a way for drivers to inform the core of the supported date/time range.
The core can then check whether the date/time or alarm is in the range
before calling ->set_time, ->set_mmss or ->set_alarm. It returns -ERANGE
when the time is out of range.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 7e253be..c068dae 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -70,6 +70,13 @@ int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
if (err != 0)
return err;
+ if (rtc->range_min != rtc->range_max) {
+ time64_t time = rtc_tm_to_time64(tm);
+
+ if (time < rtc->range_min || time > rtc->range_max)
+ return -ERANGE;
+ }
+
err = mutex_lock_interruptible(&rtc->ops_lock);
if (err)
return err;
@@ -374,6 +381,13 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
if (err != 0)
return err;
+ if (rtc->range_min != rtc->range_max) {
+ time64_t time = rtc_tm_to_time64(&alarm->time);
+
+ if (time < rtc->range_min || time > rtc->range_max)
+ return -ERANGE;
+ }
+
err = mutex_lock_interruptible(&rtc->ops_lock);
if (err)
return err;