@@ -248,8 +248,12 @@ config RTC_DRV_DS1672
This driver can also be built as a module. If so, the module
will be called rtc-ds1672.
+config RTC_DRV_DS3232_CORE
+ tristate
+
config RTC_DRV_DS3232
tristate "Dallas/Maxim DS3232"
+ select RTC_DRV_DS3232_CORE
help
If you say yes here you get support for Dallas Semiconductor
DS3232 real-time clock chips. If an interrupt is associated
@@ -58,8 +58,8 @@ obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
obj-$(CONFIG_RTC_DRV_DS1685_FAMILY) += rtc-ds1685.o
obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
obj-$(CONFIG_RTC_DRV_DS2404) += rtc-ds2404.o
+obj-$(CONFIG_RTC_DRV_DS3232_CORE) += rtc-ds3232-core.o
obj-$(CONFIG_RTC_DRV_DS3232) += rtc-ds3232.o
-rtc-ds3232-objs := rtc-ds3232-core.o
obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o
obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o
obj-$(CONFIG_RTC_DRV_EM3027) += rtc-em3027.o
@@ -1,5 +1,5 @@
/*
- * RTC client/driver for the Maxim/Dallas DS3232 Real-Time Clock over I2C
+ * RTC client/driver for the Maxim/Dallas DS3232/DS3234 Real-Time Clock
*
* Copyright (C) 2009-2011 Freescale Semiconductor.
* Author: Jack Lan <jack.lan@freescale.com>
@@ -9,23 +9,19 @@
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
-/*
- * It would be more efficient to use i2c msgs/i2c_transfer directly but, as
- * recommened in .../Documentation/i2c/writing-clients section
- * "Sending and receiving", using SMBus level communication is preferred.
- */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
-#include <linux/i2c.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
+#include "rtc-ds3232.h"
+
#define DS3232_REG_SECONDS 0x00
#define DS3232_REG_MINUTES 0x01
#define DS3232_REG_HOURS 0x02
@@ -50,7 +46,8 @@
# define DS3232_REG_SR_A1F 0x01
struct ds3232 {
- struct i2c_client *client;
+ struct device *dev;
+ const struct ds3232_ops *ops;
struct rtc_device *rtc;
struct work_struct work;
@@ -63,25 +60,24 @@ struct ds3232 {
int exiting;
};
-static struct i2c_driver ds3232_driver;
-
-static int ds3232_check_rtc_status(struct i2c_client *client)
+static int ds3232_check_rtc_status(struct device *dev)
{
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
int ret = 0;
int control, stat;
- stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
+ stat = ds3232->ops->read_byte(dev, DS3232_REG_SR);
if (stat < 0)
return stat;
if (stat & DS3232_REG_SR_OSF)
- dev_warn(&client->dev,
+ dev_warn(dev,
"oscillator discontinuity flagged, "
"time unreliable\n");
stat &= ~(DS3232_REG_SR_OSF | DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
- ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
+ ret = ds3232->ops->write_byte(dev, DS3232_REG_SR, stat);
if (ret < 0)
return ret;
@@ -90,31 +86,28 @@ static int ds3232_check_rtc_status(struct i2c_client *client)
* before everything is initialized.
*/
- control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ control = ds3232->ops->read_byte(dev, DS3232_REG_CR);
if (control < 0)
return control;
control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
control |= DS3232_REG_CR_INTCN;
- return i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
+ return ds3232->ops->write_byte(dev, DS3232_REG_CR, control);
}
static int ds3232_read_time(struct device *dev, struct rtc_time *time)
{
- struct i2c_client *client = to_i2c_client(dev);
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
int ret;
u8 buf[7];
unsigned int year, month, day, hour, minute, second;
unsigned int week, twelve_hr, am_pm;
unsigned int century, add_century = 0;
- ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_SECONDS, 7, buf);
-
- if (ret < 0)
+ ret = ds3232->ops->read_block(dev, DS3232_REG_SECONDS, buf, 7);
+ if (ret)
return ret;
- if (ret < 7)
- return -EIO;
second = buf[0];
minute = buf[1];
@@ -159,7 +152,7 @@ static int ds3232_read_time(struct device *dev, struct rtc_time *time)
static int ds3232_set_time(struct device *dev, struct rtc_time *time)
{
- struct i2c_client *client = to_i2c_client(dev);
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
u8 buf[7];
/* Extract time from rtc_time and load into ds3232*/
@@ -179,8 +172,7 @@ static int ds3232_set_time(struct device *dev, struct rtc_time *time)
buf[6] = bin2bcd(time->tm_year);
}
- return i2c_smbus_write_i2c_block_data(client,
- DS3232_REG_SECONDS, 7, buf);
+ return ds3232->ops->write_block(dev, DS3232_REG_SECONDS, buf, 7);
}
/*
@@ -190,23 +182,22 @@ static int ds3232_set_time(struct device *dev, struct rtc_time *time)
*/
static int ds3232_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
int control, stat;
int ret;
u8 buf[4];
mutex_lock(&ds3232->mutex);
- ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
+ ret = ds3232->ops->read_byte(dev, DS3232_REG_SR);
if (ret < 0)
goto out;
stat = ret;
- ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ ret = ds3232->ops->read_byte(dev, DS3232_REG_CR);
if (ret < 0)
goto out;
control = ret;
- ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
+ ret = ds3232->ops->read_block(dev, DS3232_REG_ALARM1, buf, 4);
if (ret < 0)
goto out;
@@ -236,13 +227,12 @@ out:
*/
static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
int control, stat;
int ret;
u8 buf[4];
- if (client->irq <= 0)
+ if (ds3232->ops->irq(dev) <= 0)
return -EINVAL;
mutex_lock(&ds3232->mutex);
@@ -253,46 +243,46 @@ static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
buf[3] = bin2bcd(alarm->time.tm_mday);
/* clear alarm interrupt enable bit */
- ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ ret = ds3232->ops->read_byte(dev, DS3232_REG_CR);
if (ret < 0)
goto out;
control = ret;
control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
- ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
+ ret = ds3232->ops->write_byte(dev, DS3232_REG_CR, control);
if (ret < 0)
goto out;
/* clear any pending alarm flag */
- ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
+ ret = ds3232->ops->read_byte(dev, DS3232_REG_SR);
if (ret < 0)
goto out;
stat = ret;
stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
- ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
+ ret = ds3232->ops->write_byte(dev, DS3232_REG_SR, stat);
if (ret < 0)
goto out;
- ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
+ ret = ds3232->ops->write_block(dev, DS3232_REG_ALARM1, buf, 4);
if (alarm->enabled) {
control |= DS3232_REG_CR_A1IE;
- ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
+ ret = ds3232->ops->write_byte(dev, DS3232_REG_CR, control);
}
out:
mutex_unlock(&ds3232->mutex);
return ret;
}
-static void ds3232_update_alarm(struct i2c_client *client)
+static void ds3232_update_alarm(struct device *dev)
{
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
int control;
int ret;
u8 buf[4];
mutex_lock(&ds3232->mutex);
- ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
+ ret = ds3232->ops->read_block(dev, DS3232_REG_ALARM1, buf, 4);
if (ret < 0)
goto unlock;
@@ -305,11 +295,11 @@ static void ds3232_update_alarm(struct i2c_client *client)
buf[3] = bcd2bin(buf[3]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
0x80 : buf[3];
- ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
+ ret = ds3232->ops->write_block(dev, DS3232_REG_ALARM1, buf, 4);
if (ret < 0)
goto unlock;
- control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ control = ds3232->ops->read_byte(dev, DS3232_REG_CR);
if (control < 0)
goto unlock;
@@ -319,7 +309,7 @@ static void ds3232_update_alarm(struct i2c_client *client)
else
/* disable alarm1 interrupt */
control &= ~(DS3232_REG_CR_A1IE);
- i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
+ ds3232->ops->write_byte(dev, DS3232_REG_CR, control);
unlock:
mutex_unlock(&ds3232->mutex);
@@ -327,10 +317,9 @@ unlock:
static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
- if (client->irq <= 0)
+ if (ds3232->ops->irq(dev) <= 0)
return -EINVAL;
if (enabled)
@@ -338,14 +327,14 @@ static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
else
ds3232->rtc->irq_data &= ~RTC_AF;
- ds3232_update_alarm(client);
+ ds3232_update_alarm(dev);
return 0;
}
static irqreturn_t ds3232_irq(int irq, void *dev_id)
{
- struct i2c_client *client = dev_id;
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ struct device *dev = dev_id;
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
disable_irq_nosync(irq);
@@ -363,34 +352,33 @@ static irqreturn_t ds3232_irq(int irq, void *dev_id)
static void ds3232_work(struct work_struct *work)
{
struct ds3232 *ds3232 = container_of(work, struct ds3232, work);
- struct i2c_client *client = ds3232->client;
+ struct device *dev = ds3232->dev;
int stat, control;
mutex_lock(&ds3232->mutex);
- stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
+ stat = ds3232->ops->read_byte(dev, DS3232_REG_SR);
if (stat < 0)
goto unlock;
if (stat & DS3232_REG_SR_A1F) {
- control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
+ control = ds3232->ops->read_byte(dev, DS3232_REG_CR);
if (control < 0) {
pr_warn("Read Control Register error - Disable IRQ%d\n",
- client->irq);
+ ds3232->ops->irq(dev));
} else {
/* disable alarm1 interrupt */
control &= ~(DS3232_REG_CR_A1IE);
- i2c_smbus_write_byte_data(client, DS3232_REG_CR,
- control);
+ ds3232->ops->write_byte(dev, DS3232_REG_CR, control);
/* clear the alarm pend flag */
stat &= ~DS3232_REG_SR_A1F;
- i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
+ ds3232->ops->write_byte(dev, DS3232_REG_SR, stat);
rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF);
if (!ds3232->exiting)
- enable_irq(client->irq);
+ enable_irq(ds3232->ops->irq(dev));
}
}
@@ -406,64 +394,66 @@ static const struct rtc_class_ops ds3232_rtc_ops = {
.alarm_irq_enable = ds3232_alarm_irq_enable,
};
-static int ds3232_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+int ds3232_probe(struct device *dev, const struct ds3232_ops *ops,
+ const char *name)
{
struct ds3232 *ds3232;
int ret;
- ds3232 = devm_kzalloc(&client->dev, sizeof(struct ds3232), GFP_KERNEL);
+ ds3232 = devm_kzalloc(dev, sizeof(*ds3232), GFP_KERNEL);
if (!ds3232)
return -ENOMEM;
- ds3232->client = client;
- i2c_set_clientdata(client, ds3232);
+ ds3232->ops = ops;
+ ds3232->dev = dev;
+ dev_set_drvdata(dev, ds3232);
INIT_WORK(&ds3232->work, ds3232_work);
mutex_init(&ds3232->mutex);
- ret = ds3232_check_rtc_status(client);
+ ret = ds3232_check_rtc_status(dev);
if (ret)
return ret;
- if (client->irq > 0) {
- ret = devm_request_irq(&client->dev, client->irq, ds3232_irq,
- IRQF_SHARED, "ds3232", client);
+ if (ds3232->ops->irq(dev) > 0) {
+ ret = devm_request_irq(dev, ds3232->ops->irq(dev), ds3232_irq,
+ IRQF_SHARED, name, dev);
if (ret) {
- dev_err(&client->dev, "unable to request IRQ\n");
+ dev_err(dev, "unable to request IRQ\n");
}
- device_init_wakeup(&client->dev, 1);
+ device_init_wakeup(dev, 1);
}
- ds3232->rtc = devm_rtc_device_register(&client->dev, client->name,
+ ds3232->rtc = devm_rtc_device_register(dev, name,
&ds3232_rtc_ops, THIS_MODULE);
return PTR_ERR_OR_ZERO(ds3232->rtc);
}
+EXPORT_SYMBOL_GPL(ds3232_probe);
-static int ds3232_remove(struct i2c_client *client)
+int ds3232_remove(struct device *dev)
{
- struct ds3232 *ds3232 = i2c_get_clientdata(client);
+ struct ds3232 *ds3232 = dev_get_drvdata(dev);
- if (client->irq > 0) {
+ if (ds3232->ops->irq(dev) > 0) {
mutex_lock(&ds3232->mutex);
ds3232->exiting = 1;
mutex_unlock(&ds3232->mutex);
- devm_free_irq(&client->dev, client->irq, client);
+ devm_free_irq(dev, ds3232->ops->irq(dev), dev);
cancel_work_sync(&ds3232->work);
}
return 0;
}
+EXPORT_SYMBOL_GPL(ds3232_remove);
#ifdef CONFIG_PM_SLEEP
static int ds3232_suspend(struct device *dev)
{
struct ds3232 *ds3232 = dev_get_drvdata(dev);
- struct i2c_client *client = to_i2c_client(dev);
if (device_can_wakeup(dev)) {
ds3232->suspended = true;
- if (irq_set_irq_wake(client->irq, 1)) {
+ if (irq_set_irq_wake(ds3232->ops->irq(dev), 1)) {
dev_warn_once(dev, "Cannot set wakeup source\n");
ds3232->suspended = false;
}
@@ -475,7 +465,6 @@ static int ds3232_suspend(struct device *dev)
static int ds3232_resume(struct device *dev)
{
struct ds3232 *ds3232 = dev_get_drvdata(dev);
- struct i2c_client *client = to_i2c_client(dev);
if (ds3232->suspended) {
ds3232->suspended = false;
@@ -483,34 +472,17 @@ static int ds3232_resume(struct device *dev)
/* Clear the hardware alarm pend flag */
schedule_work(&ds3232->work);
- irq_set_irq_wake(client->irq, 0);
+ irq_set_irq_wake(ds3232->ops->irq(dev), 0);
}
return 0;
}
#endif
-static const struct dev_pm_ops ds3232_pm_ops = {
+const struct dev_pm_ops ds3232_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume)
};
-
-static const struct i2c_device_id ds3232_id[] = {
- { "ds3232", 0 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, ds3232_id);
-
-static struct i2c_driver ds3232_driver = {
- .driver = {
- .name = "rtc-ds3232",
- .pm = &ds3232_pm_ops,
- },
- .probe = ds3232_probe,
- .remove = ds3232_remove,
- .id_table = ds3232_id,
-};
-
-module_i2c_driver(ds3232_driver);
+EXPORT_SYMBOL_GPL(ds3232_pm_ops);
MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>");
MODULE_DESCRIPTION("Maxim/Dallas DS3232 RTC Driver");
new file mode 100644
@@ -0,0 +1,105 @@
+/*
+ * RTC client/driver for the Maxim/Dallas DS3232 Real-Time Clock over I2C
+ *
+ * Copyright (C) 2009-2011 Freescale Semiconductor.
+ * Author: Jack Lan <jack.lan@freescale.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+/*
+ * It would be more efficient to use i2c msgs/i2c_transfer directly but, as
+ * recommened in .../Documentation/i2c/writing-clients section
+ * "Sending and receiving", using SMBus level communication is preferred.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+
+#include "rtc-ds3232.h"
+
+static int ds3232_i2c_read_byte(struct device *dev, u8 reg)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int ds3232_i2c_write_byte(struct device *dev, u8 reg, u8 val)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ return i2c_smbus_write_byte_data(client, reg, val);
+}
+
+static int ds3232_i2c_read_block(struct device *dev, u8 reg, void *buf, int len)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
+ if (ret != len)
+ ret = -EIO;
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int ds3232_i2c_write_block(struct device *dev, u8 reg, const void *buf,
+ int len)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ return i2c_smbus_write_i2c_block_data(client, reg, len, buf);
+}
+
+static int ds3232_i2c_irq(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ return client->irq;
+}
+
+static const struct ds3232_ops ds3232_i2c_ops = {
+ .read_byte = ds3232_i2c_read_byte,
+ .write_byte = ds3232_i2c_write_byte,
+ .read_block = ds3232_i2c_read_block,
+ .write_block = ds3232_i2c_write_block,
+ .irq = ds3232_i2c_irq,
+};
+
+static int ds3232_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ return ds3232_probe(&client->dev, &ds3232_i2c_ops, client->name);
+}
+
+static int ds3232_i2c_remove(struct i2c_client *client)
+{
+ return ds3232_remove(&client->dev);
+}
+
+static const struct i2c_device_id ds3232_id[] = {
+ { "ds3232", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ds3232_id);
+
+static struct i2c_driver ds3232_driver = {
+ .driver = {
+ .name = "rtc-ds3232",
+ .pm = &ds3232_pm_ops,
+ },
+ .probe = ds3232_i2c_probe,
+ .remove = ds3232_i2c_remove,
+ .id_table = ds3232_id,
+};
+module_i2c_driver(ds3232_driver);
+
+MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>");
+MODULE_DESCRIPTION("Maxim/Dallas DS3232 RTC Driver");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,28 @@
+/*
+ * RTC client/driver for the Maxim/Dallas DS3232/DS3234 Real-Time Clock
+ *
+ * Copyright (C) 2009-2011 Freescale Semiconductor.
+ * Author: Jack Lan <jack.lan@freescale.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+#ifndef __RTC_DS3232_H__
+#define __RTC_DS3232_H__
+
+struct ds3232_ops {
+ int (*read_byte)(struct device *, u8);
+ int (*write_byte)(struct device *, u8, u8);
+ int (*read_block)(struct device *, u8, void *, int);
+ int (*write_block)(struct device *, u8, const void *, int);
+ int (*irq)(struct device *);
+};
+
+int ds3232_probe(struct device *dev, const struct ds3232_ops *ops,
+ const char *name);
+int ds3232_remove(struct device *dev);
+extern const struct dev_pm_ops ds3232_pm_ops;
+
+#endif
According to "Feature Comparison of the DS323x Real-Time Clocks" (http://pdfserv.maximintegrated.com/en/an/AN5143.pdf), DS3232 and DS3234 are very similar. In order to share common code between rtc-ds3232 and rtc-ds3234, this splits rtc-ds3232 driver into core module and i2c driver. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com> Cc: Jack Lan <jack.lan@freescale.com> Cc: Srikanth Srinivasan <srikanth.srinivasan@freescale.com> Cc: Dennis Aberilla <denzzzhome@yahoo.com> --- drivers/rtc/Kconfig | 4 + drivers/rtc/Makefile | 2 +- drivers/rtc/rtc-ds3232-core.c | 168 ++++++++++++++++++------------------------ drivers/rtc/rtc-ds3232.c | 105 ++++++++++++++++++++++++++ drivers/rtc/rtc-ds3232.h | 28 +++++++ 5 files changed, 208 insertions(+), 99 deletions(-) create mode 100644 drivers/rtc/rtc-ds3232.c create mode 100644 drivers/rtc/rtc-ds3232.h