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Subject[PATCH 6/6] rtc: pcf8563 Clear expired alarm at boot time
Date
In case the card is woken up of the rtc alarm, the devm_rtc_device_register
function detects it as a pending alarm about a month in the future. Fix this
by clearing the alarm in module probe.

Signed-off-by: Jan Kardell <jan.kardell@telliq.com>
---
drivers/rtc/rtc-pcf8563.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 1e14f60..96fb32e 100644
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -396,6 +396,7 @@ static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)

static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
{
+ dev_dbg(dev, "%s: en=%d\n", __func__, enabled);
return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
}

@@ -414,6 +415,7 @@ static int pcf8563_probe(struct i2c_client *client,
struct pcf8563 *pcf8563;
int err;
unsigned char buf;
+ unsigned char alm_pending;

dev_dbg(&client->dev, "%s\n", __func__);

@@ -439,6 +441,14 @@ static int pcf8563_probe(struct i2c_client *client,
return err;
}

+ err = pcf8563_get_alarm_mode(client, NULL, &alm_pending);
+ if (err < 0) {
+ dev_err(&client->dev, "%s: read error\n", __func__);
+ return err;
+ }
+ if (alm_pending)
+ pcf8563_set_alarm_mode(client, 0);
+
pcf8563->rtc = devm_rtc_device_register(&client->dev,
pcf8563_driver.driver.name,
&pcf8563_rtc_ops, THIS_MODULE);
--
1.8.4.5


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