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[PATCH 6/6] rtc/mc13783: implement alarm

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Uwe Kleine-König

unread,
Mar 1, 2010, 6:00:02 AM3/1/10
to
Signed-off-by: Uwe Kleine-König <u.klein...@pengutronix.de>
---
Hello,

for now this just ignores the possible race to trigger an alarm when
setting the time. Should I resolve that, if so, what is the prefered
way to do that?

Best regards
Uwe

drivers/rtc/rtc-mc13783.c | 159 +++++++++++++++++++++++++++++++++++++++++----
1 files changed, 147 insertions(+), 12 deletions(-)

diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c
index 6a36201..ae01217 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);
@@ -114,6 +142,107 @@ 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 +260,21 @@ 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 +323,19 @@ 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 +361,7 @@ 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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Uwe Kleine-König

unread,
Mar 1, 2010, 6:00:02 AM3/1/10
to
mc13783_ackirq, mc13783_unmask and mc13783_mask are deprecated, use the
drop in replacements with the nicer names.

Signed-off-by: Uwe Kleine-König <u.klein...@pengutronix.de>
---
Hello,

note this obviously depends on patch 1/6.

Best regards
Uwe

drivers/rtc/rtc-mc13783.c | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c
index 850f983..0a978a0 100644
--- a/drivers/rtc/rtc-mc13783.c
+++ b/drivers/rtc/rtc-mc13783.c
@@ -101,11 +101,11 @@ static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs)
if (unlikely(ret))
goto out;

- ret = mc13783_ackirq(priv->mc13783, MC13783_IRQ_RTCRST);
+ ret = mc13783_irq_ack(priv->mc13783, MC13783_IRQ_RTCRST);
if (unlikely(ret))
goto out;

- ret = mc13783_unmask(priv->mc13783, MC13783_IRQ_RTCRST);
+ ret = mc13783_irq_unmask(priv->mc13783, MC13783_IRQ_RTCRST);
out:
priv->valid = !ret;

@@ -123,7 +123,7 @@ static irqreturn_t mc13783_rtc_update_handler(int irq, void *dev)

rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);

- mc13783_ackirq(mc13783, irq);
+ mc13783_irq_ack(mc13783, irq);

return IRQ_HANDLED;
}
@@ -138,7 +138,7 @@ static int mc13783_rtc_update_irq_enable(struct device *dev,
if (!priv->valid)
goto out;

- ret = (enabled ? mc13783_unmask : mc13783_mask)(priv->mc13783,
+ ret = (enabled ? mc13783_irq_unmask : mc13783_irq_mask)(priv->mc13783,
MC13783_IRQ_1HZ);
out:
mc13783_unlock(priv->mc13783);
@@ -160,7 +160,7 @@ static irqreturn_t mc13783_rtc_reset_handler(int irq, void *dev)
dev_dbg(&priv->rtc->dev, "RTCRST\n");
priv->valid = 0;

- mc13783_mask(mc13783, irq);
+ mc13783_irq_mask(mc13783, irq);

return IRQ_HANDLED;

Uwe Kleine-König

unread,
Mar 1, 2010, 6:00:01 AM3/1/10
to
This is to protect from interrupt handlers using an unregistered rtc
device.

To assert that the reset irq is considered now before the rtc is
registered the corresponding status is checked before.

Signed-off-by: Uwe Kleine-König <u.klein...@pengutronix.de>
---
Hello,

this depends on patch 4/6 which added mc13783_irq_status.

Best regards
Uwe

drivers/rtc/rtc-mc13783.c | 25 ++++++++++++++-----------
1 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c
index 0a978a0..6a36201 100644
--- a/drivers/rtc/rtc-mc13783.c
+++ b/drivers/rtc/rtc-mc13783.c
@@ -169,6 +169,7 @@ static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
{
int ret;
struct mc13783_rtc *priv;
+ int rtcrst_pending;

priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -177,8 +178,6 @@ static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
platform_set_drvdata(pdev, priv);

- priv->valid = 1;
-
mc13783_lock(priv->mc13783);

ret = mc13783_irq_request(priv->mc13783, MC13783_IRQ_RTCRST,
@@ -186,33 +185,37 @@ static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
if (ret)
goto err_reset_irq_request;

+ ret = mc13783_irq_status(priv->mc13783, MC13783_IRQ_RTCRST,
+ NULL, &rtcrst_pending);
+ if (ret)
+ goto err_reset_irq_status;
+
+ priv->valid = !rtcrst_pending;
+
ret = mc13783_irq_request_nounmask(priv->mc13783, MC13783_IRQ_1HZ,
mc13783_rtc_update_handler, DRIVER_NAME, priv);
if (ret)
goto err_update_irq_request;

- mc13783_unlock(priv->mc13783);
-


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_lock(priv->mc13783);
-


mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
err_update_irq_request:

+err_reset_irq_status:
+
mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);
err_reset_irq_request:

- mc13783_unlock(priv->mc13783);
-
platform_set_drvdata(pdev, NULL);
kfree(priv);
}

+ mc13783_unlock(priv->mc13783);
+
return ret;
}

@@ -220,10 +223,10 @@ static int __devexit mc13783_rtc_remove(struct platform_device *pdev)
{
struct mc13783_rtc *priv = platform_get_drvdata(pdev);

- rtc_device_unregister(priv->rtc);
-
mc13783_lock(priv->mc13783);

+ rtc_device_unregister(priv->rtc);
+


mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);

Uwe Kleine-König

unread,
Mar 1, 2010, 6:00:03 AM3/1/10
to
The driver for the mc13783 rtc needs to know if the TODA irq is pending.

Instead of tracking in the rtc driver if the irq is enabled provide that
information, too.

Signed-off-by: Uwe Kleine-König <u.klein...@pengutronix.de>
---

drivers/mfd/mc13783-core.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/mfd/mc13783.h | 2 ++
2 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/mc13783-core.c b/drivers/mfd/mc13783-core.c
index f89d12d..2a5334a 100644
--- a/drivers/mfd/mc13783-core.c
+++ b/drivers/mfd/mc13783-core.c
@@ -269,6 +269,41 @@ int mc13783_irq_unmask(struct mc13783 *mc13783, int irq)
}
EXPORT_SYMBOL(mc13783_irq_unmask);

+int mc13783_irq_status(struct mc13783 *mc13783, int irq,
+ int *enabled, int *pending)
+{
+ int ret;
+ unsigned int offmask = irq < 24 ? MC13783_IRQMASK0 : MC13783_IRQMASK1;
+ unsigned int offstat = irq < 24 ? MC13783_IRQSTAT0 : MC13783_IRQSTAT1;
+ u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
+
+ if (irq < 0 || irq >= MC13783_NUM_IRQ)
+ return -EINVAL;
+
+ if (enabled) {
+ u32 mask;
+
+ ret = mc13783_reg_read(mc13783, offmask, &mask);


+ if (ret)
+ return ret;
+

+ *enabled = mask & irqbit;
+ }
+
+ if (pending) {
+ u32 stat;
+
+ ret = mc13783_reg_read(mc13783, offstat, &stat);


+ if (ret)
+ return ret;
+

+ *pending = stat & irqbit;
+ }


+
+ return 0;
+}

+EXPORT_SYMBOL(mc13783_irq_status);
+
int mc13783_irq_ack(struct mc13783 *mc13783, int irq)
{
unsigned int offstat = irq < 24 ? MC13783_IRQSTAT0 : MC13783_IRQSTAT1;
diff --git a/include/linux/mfd/mc13783.h b/include/linux/mfd/mc13783.h
index 05619f0..9d1dbc9 100644
--- a/include/linux/mfd/mc13783.h
+++ b/include/linux/mfd/mc13783.h
@@ -29,6 +29,8 @@ int mc13783_irq_free(struct mc13783 *mc13783, int irq, void *dev);

int mc13783_irq_mask(struct mc13783 *mc13783, int irq);
int mc13783_irq_unmask(struct mc13783 *mc13783, int irq);
+int mc13783_irq_status(struct mc13783 *mc13783, int irq,
+ int *enabled, int *pending);
int mc13783_irq_ack(struct mc13783 *mc13783, int irq);

static inline int mc13783_mask(struct mc13783 *mc13783, int irq) __deprecated;

Alessandro Zummo

unread,
Mar 1, 2010, 6:00:01 AM3/1/10
to
On Mon, 1 Mar 2010 11:53:45 +0100
Uwe Kleine-K�nig <u.klein...@pengutronix.de> wrote:

> for now this just ignores the possible race to trigger an alarm when
> setting the time. Should I resolve that, if so, what is the prefered
> way to do that?

I saw you email on the topic but I haven't had
the time to answer appropriately.

I'd suggest to disable the alarm irq while setting
the time.

--

Best regards,

Alessandro Zummo,
Tower Technologies - Torino, Italy

http://www.towertech.it

Uwe Kleine-König

unread,
Mar 1, 2010, 6:20:02 AM3/1/10
to
On Mon, Mar 01, 2010 at 11:56:25AM +0100, Alessandro Zummo wrote:
> On Mon, 1 Mar 2010 11:53:45 +0100
> Uwe Kleine-K�nig <u.klein...@pengutronix.de> wrote:
>
> > for now this just ignores the possible race to trigger an alarm when
> > setting the time. Should I resolve that, if so, what is the prefered
> > way to do that?
>
> I saw you email on the topic but I haven't had
> the time to answer appropriately.
>
> I'd suggest to disable the alarm irq while setting
> the time.
I have two possibilities, I'm not sure if you mean the first or just any
of the two:

1)
pending = is_alarm_pending
mask_alarm_irq
set time and date
if (!pending)
ack_alarm_irq
unmask_alarm_irq

2)
alarmtime = read_alaram
program_alarm(invalid)
set time and date
program_alarm(alarmtime)

I'd prefer 2), is that OK for you, too?

Best regards
Uwe

--
Pengutronix e.K. | Uwe Kleine-K�nig |
Industrial Linux Solutions | http://www.pengutronix.de/ |

Alessandro Zummo

unread,
Mar 1, 2010, 6:50:02 AM3/1/10
to
On Mon, 1 Mar 2010 12:10:07 +0100
Uwe Kleine-K�nig <u.klein...@pengutronix.de> wrote:

> 2)
> alarmtime = read_alaram
> program_alarm(invalid)
> set time and date
> program_alarm(alarmtime)
>
> I'd prefer 2), is that OK for you, too?

seems fine to me.

--

Best regards,

Alessandro Zummo,
Tower Technologies - Torino, Italy

http://www.towertech.it

--

Uwe Kleine-König

unread,
Mar 2, 2010, 4:50:01 AM3/2/10
to
Signed-off-by: Uwe Kleine-König <u.klein...@pengutronix.de>
---
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

+ 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:

+ 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;
+}

+ 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,

@@ -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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