rtc: expose RTC_FEATURE_UPDATE_INTERRUPT

Set RTC_FEATURE_UPDATE_INTERRUPT by default and clear it when it is not
supported.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211018152337.78732-1-alexandre.belloni@bootlin.com

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 2e0cbc1..4b460c6 100644 (file)
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -232,6 +232,7 @@ static struct rtc_device *rtc_allocate_device(void)
        rtc->pie_enabled = 0;
 
        set_bit(RTC_FEATURE_ALARM, rtc->features);
+       set_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);
 
        return rtc;
 }
@@ -389,6 +390,9 @@ int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc)
        if (!rtc->ops->set_alarm)
                clear_bit(RTC_FEATURE_ALARM, rtc->features);
 
+       if (rtc->uie_unsupported)
+               clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);
+
        if (rtc->ops->set_offset)
                set_bit(RTC_FEATURE_CORRECTION, rtc->features);
 

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 9a2bd49..d005623 100644 (file)
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -561,7 +561,8 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled)
        if (rtc->uie_rtctimer.enabled == enabled)
                goto out;
 
-       if (rtc->uie_unsupported || !test_bit(RTC_FEATURE_ALARM, rtc->features)) {
+       if (!test_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features) ||
+           !test_bit(RTC_FEATURE_ALARM, rtc->features)) {
                mutex_unlock(&rtc->ops_lock);
 #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
                return rtc_dev_update_irq_enable_emul(rtc, enabled);