[PATCH v2 6/6] rtc/mc13783: implement alarm
From: Uwe Kleine-KÃnig
Date: Tue Mar 02 2010 - 04:48:15 EST
Signed-off-by: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>
---
Hello,
changes since first submission:
- implement race free time setting
Best regards
Uwe
drivers/rtc/rtc-mc13783.c | 185 +++++++++++++++++++++++++++++++++++++++++---
1 files changed, 172 insertions(+), 13 deletions(-)
diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c
index 6a36201..d60c81b 100644
--- a/drivers/rtc/rtc-mc13783.c
+++ b/drivers/rtc/rtc-mc13783.c
@@ -28,6 +28,34 @@ struct mc13783_rtc {
int valid;
};
+static int mc13783_rtc_irq_enable_unlocked(struct device *dev,
+ unsigned int enabled, int irq)
+{
+ struct mc13783_rtc *priv = dev_get_drvdata(dev);
+ int (*func)(struct mc13783 *mc13783, int irq);
+
+ if (!priv->valid)
+ return -ENODATA;
+
+ func = enabled ? mc13783_irq_unmask : mc13783_irq_mask;
+ return func(priv->mc13783, irq);
+}
+
+static int mc13783_rtc_irq_enable(struct device *dev,
+ unsigned int enabled, int irq)
+{
+ struct mc13783_rtc *priv = dev_get_drvdata(dev);
+ int ret;
+
+ mc13783_lock(priv->mc13783);
+
+ ret = mc13783_rtc_irq_enable_unlocked(dev, enabled, irq);
+
+ mc13783_unlock(priv->mc13783);
+
+ return ret;
+}
+
static int mc13783_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct mc13783_rtc *priv = dev_get_drvdata(dev);
@@ -78,6 +106,7 @@ static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs)
{
struct mc13783_rtc *priv = dev_get_drvdata(dev);
unsigned int seconds, days;
+ unsigned int alarmseconds;
int ret;
seconds = secs % 86400;
@@ -86,7 +115,22 @@ static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs)
mc13783_lock(priv->mc13783);
/*
- * first write seconds=0 to prevent a day switch between writing days
+ * temporarily invalidate alarm to prevent triggering it when the day is
+ * already updated while the time isn't yet.
+ */
+ ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTODA, &alarmseconds);
+ if (unlikely(ret))
+ goto out;
+
+ if (alarmseconds < 86400) {
+ ret = mc13783_reg_write(priv->mc13783,
+ MC13783_RTCTODA, 0x1ffff);
+ if (unlikely(ret))
+ goto out;
+ }
+
+ /*
+ * write seconds=0 to prevent a day switch between writing days
* and seconds below
*/
ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTOD, 0);
@@ -101,6 +145,14 @@ static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs)
if (unlikely(ret))
goto out;
+ /* restore alarm */
+ if (alarmseconds < 86400) {
+ ret = mc13783_reg_write(priv->mc13783,
+ MC13783_RTCTODA, alarmseconds);
+ if (unlikely(ret))
+ goto out;
+ }
+
ret = mc13783_irq_ack(priv->mc13783, MC13783_IRQ_RTCRST);
if (unlikely(ret))
goto out;
@@ -114,6 +166,107 @@ out:
return ret;
}
+static int mc13783_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ struct mc13783_rtc *priv = dev_get_drvdata(dev);
+ unsigned seconds, days;
+ unsigned long s1970;
+ int enabled, pending;
+ int ret;
+
+ mc13783_lock(priv->mc13783);
+
+ ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTODA, &seconds);
+ if (unlikely(ret))
+ goto out;
+ if (seconds >= 86400) {
+ ret = -ENODATA;
+ goto out;
+ }
+
+ ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days);
+ if (unlikely(ret))
+ goto out;
+
+ ret = mc13783_irq_status(priv->mc13783, MC13783_IRQ_TODA,
+ &enabled, &pending);
+
+out:
+ mc13783_unlock(priv->mc13783);
+
+ if (ret)
+ return ret;
+
+ alarm->enabled = enabled;
+ alarm->pending = pending;
+
+ s1970 = days * 86400 + seconds;
+
+ rtc_time_to_tm(s1970, &alarm->time);
+ dev_dbg(dev, "%s: %lu\n", __func__, s1970);
+
+ return 0;
+}
+
+static int mc13783_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+ struct mc13783_rtc *priv = dev_get_drvdata(dev);
+ unsigned long s1970;
+ unsigned seconds, days;
+ int ret;
+
+ mc13783_lock(priv->mc13783);
+
+ /* disable alarm to prevent false triggering */
+ ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTODA, 0x1ffff);
+ if (unlikely(ret))
+ goto out;
+
+ ret = mc13783_irq_ack(priv->mc13783, MC13783_IRQ_TODA);
+ if (unlikely(ret))
+ goto out;
+
+ ret = rtc_tm_to_time(&alarm->time, &s1970);
+ if (unlikely(ret))
+ goto out;
+
+ dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff",
+ s1970);
+
+ ret = mc13783_rtc_irq_enable_unlocked(dev, alarm->enabled,
+ MC13783_IRQ_TODA);
+ if (unlikely(ret))
+ goto out;
+
+ seconds = s1970 % 86400;
+ days = s1970 / 86400;
+
+ ret = mc13783_reg_write(priv->mc13783, MC13783_RTCDAYA, days);
+ if (unlikely(ret))
+ goto out;
+
+ ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTODA, seconds);
+
+out:
+ mc13783_unlock(priv->mc13783);
+
+ return ret;
+}
+
+static irqreturn_t mc13783_rtc_alarm_handler(int irq, void *dev)
+{
+ struct mc13783_rtc *priv = dev;
+ struct mc13783 *mc13783 = priv->mc13783;
+
+ dev_dbg(&priv->rtc->dev, "Alarm\n");
+
+ rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);
+
+ mc13783_irq_ack(mc13783, irq);
+
+ return IRQ_HANDLED;
+}
+
static irqreturn_t mc13783_rtc_update_handler(int irq, void *dev)
{
struct mc13783_rtc *priv = dev;
@@ -131,24 +284,21 @@ static irqreturn_t mc13783_rtc_update_handler(int irq, void *dev)
static int mc13783_rtc_update_irq_enable(struct device *dev,
unsigned int enabled)
{
- struct mc13783_rtc *priv = dev_get_drvdata(dev);
- int ret = -ENODATA;
-
- mc13783_lock(priv->mc13783);
- if (!priv->valid)
- goto out;
-
- ret = (enabled ? mc13783_irq_unmask : mc13783_irq_mask)(priv->mc13783,
- MC13783_IRQ_1HZ);
-out:
- mc13783_unlock(priv->mc13783);
+ return mc13783_rtc_irq_enable(dev, enabled, MC13783_IRQ_1HZ);
+}
- return ret;
+static int mc13783_rtc_alarm_irq_enable(struct device *dev,
+ unsigned int enabled)
+{
+ return mc13783_rtc_irq_enable(dev, enabled, MC13783_IRQ_TODA);
}
static const struct rtc_class_ops mc13783_rtc_ops = {
.read_time = mc13783_rtc_read_time,
.set_mmss = mc13783_rtc_set_mmss,
+ .read_alarm = mc13783_rtc_read_alarm,
+ .set_alarm = mc13783_rtc_set_alarm,
+ .alarm_irq_enable = mc13783_rtc_alarm_irq_enable,
.update_irq_enable = mc13783_rtc_update_irq_enable,
};
@@ -197,11 +347,19 @@ static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
if (ret)
goto err_update_irq_request;
+ ret = mc13783_irq_request_nounmask(priv->mc13783, MC13783_IRQ_TODA,
+ mc13783_rtc_alarm_handler, DRIVER_NAME, priv);
+ if (ret)
+ goto err_alarm_irq_request;
+
priv->rtc = rtc_device_register(pdev->name,
&pdev->dev, &mc13783_rtc_ops, THIS_MODULE);
if (IS_ERR(priv->rtc)) {
ret = PTR_ERR(priv->rtc);
+ mc13783_irq_free(priv->mc13783, MC13783_IRQ_TODA, priv);
+err_alarm_irq_request:
+
mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
err_update_irq_request:
@@ -227,6 +385,7 @@ static int __devexit mc13783_rtc_remove(struct platform_device *pdev)
rtc_device_unregister(priv->rtc);
+ mc13783_irq_free(priv->mc13783, MC13783_IRQ_TODA, priv);
mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);
--
1.7.0
--
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