[PATCH] rtc/tpo: Implement rtc_class_ops.alarm_irq_enable callback

[Vaibhav Jain]

Provide an implementation of the callback
rtc_class_ops.alarm_irq_enable callback for rtc-opal driver. This
callback is called when the wake alarm is disabled via the command:

'echo 0 > /sys/class/rtc/rtc0/wakealarm'

Without this the Timed-Power-On(TPO) config remains set even when its
disabled by the above command and the FSP will force machine boot at
previously configured time.

The callback is implemented as function opal_tpo_alarm_irq_enable()
which calls opal_set_tpo_time() with alarm.enabled == 0. A branch has
been added to opal_set_tpo_time() to handle this case by passing y_m_d
== h_m_s_ms == 0 to opal as arguments for opal_tpo_write() call.

Patch-based-on: https://patchwork.ozlabs.org/patch/764559/
Signed-off-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
---
Corresponding opal side changes posted at
https://patchwork.ozlabs.org/patch/764555/ "fsp/tpo: Provide support
for disabling TPO alarm"
---
 drivers/rtc/rtc-opal.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-opal.c b/drivers/rtc/rtc-opal.c
index 2d84e2a..e2a946c 100644
--- a/drivers/rtc/rtc-opal.c
+++ b/drivers/rtc/rtc-opal.c
@@ -167,7 +167,14 @@ static int opal_set_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
 	u32 y_m_d = 0;
 	int token, rc;
 
-	tm_to_opal(&alarm->time, &y_m_d, &h_m_s_ms);
+	/* if alarm is enabled */
+	if (alarm->enabled) {
+		tm_to_opal(&alarm->time, &y_m_d, &h_m_s_ms);
+		pr_debug("Alarm set to %x %llx\n", y_m_d, h_m_s_ms);
+
+	} else {
+		pr_debug("Alarm getting disabled\n");
+	}
 
 	token = opal_async_get_token_interruptible();
 	if (token < 0) {
@@ -200,6 +207,18 @@ static int opal_set_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
 	return rc;
 }
 
+int opal_tpo_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct rtc_wkalrm alarm = { .enabled = 0 };
+
+	/*
+	 * TPO is automatically enabled when opal_set_tpo_time() is called with
+	 * non-zero rtc-time. We only handle disable case which needs to be
+	 * explicitly told to opal.
+	 */
+	return enabled ? 0 : opal_set_tpo_time(dev, &alarm);
+}
+
 static struct rtc_class_ops opal_rtc_ops = {
 	.read_time	= opal_get_rtc_time,
 	.set_time	= opal_set_rtc_time,
@@ -215,6 +234,7 @@ static int opal_rtc_probe(struct platform_device *pdev)
 		device_set_wakeup_capable(&pdev->dev, true);
 		opal_rtc_ops.read_alarm	= opal_get_tpo_time;
 		opal_rtc_ops.set_alarm = opal_set_tpo_time;
+		opal_rtc_ops.alarm_irq_enable = opal_tpo_alarm_irq_enable;
 	}
 
 	rtc = devm_rtc_device_register(&pdev->dev, DRVNAME, &opal_rtc_ops,
-- 
2.9.3