drivers/rtc/rtc-da9063.c - kernel/bruno - Git at Google

 /* rtc-da9063.c - Real time clock device driver for DA9063
  * Copyright (C) 2013-14  Dialog Semiconductor Ltd.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/rtc.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/regmap.h>
 #include <linux/mfd/da9063/registers.h>
 #include <linux/mfd/da9063/core.h>

 #define YEARS_TO_DA9063(year)		((year) - 100)
 #define MONTHS_TO_DA9063(month)		((month) + 1)
 #define YEARS_FROM_DA9063(year)		((year) + 100)
 #define MONTHS_FROM_DA9063(month)	((month) - 1)

 #define RTC_ALARM_DATA_LEN (DA9063_AD_REG_ALARM_Y - DA9063_AD_REG_ALARM_MI + 1)

 #define RTC_DATA_LEN	(DA9063_REG_COUNT_Y - DA9063_REG_COUNT_S + 1)
 #define RTC_SEC		0
 #define RTC_MIN		1
 #define RTC_HOUR	2
 #define RTC_DAY		3
 #define RTC_MONTH	4
 #define RTC_YEAR	5

 struct da9063_rtc {
 	struct rtc_device	*rtc_dev;
 	struct da9063		*hw;
 	struct rtc_time		alarm_time;
 	bool			rtc_sync;
 	int			alarm_year;
 	int			alarm_start;
 	int			alarm_len;
 	int			data_start;
 };

 static void da9063_data_to_tm(u8 *data, struct rtc_time *tm)
 {
 	tm->tm_sec  = data[RTC_SEC]  & DA9063_COUNT_SEC_MASK;
 	tm->tm_min  = data[RTC_MIN]  & DA9063_COUNT_MIN_MASK;
 	tm->tm_hour = data[RTC_HOUR] & DA9063_COUNT_HOUR_MASK;
 	tm->tm_mday = data[RTC_DAY]  & DA9063_COUNT_DAY_MASK;
 	tm->tm_mon  = MONTHS_FROM_DA9063(data[RTC_MONTH] &
 					 DA9063_COUNT_MONTH_MASK);
 	tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
 					DA9063_COUNT_YEAR_MASK);
 }

 static void da9063_tm_to_data(struct rtc_time *tm, u8 *data)
 {
 	data[RTC_SEC] &= ~DA9063_COUNT_SEC_MASK;
 	data[RTC_SEC] |= tm->tm_sec & DA9063_COUNT_SEC_MASK;

 	data[RTC_MIN] &= ~DA9063_COUNT_MIN_MASK;
 	data[RTC_MIN] |= tm->tm_min & DA9063_COUNT_MIN_MASK;

 	data[RTC_HOUR] &= ~DA9063_COUNT_HOUR_MASK;
 	data[RTC_HOUR] |= tm->tm_hour & DA9063_COUNT_HOUR_MASK;

 	data[RTC_DAY] &= ~DA9063_COUNT_DAY_MASK;
 	data[RTC_DAY] |= tm->tm_mday & DA9063_COUNT_DAY_MASK;

 	data[RTC_MONTH] &= ~DA9063_COUNT_MONTH_MASK;
 	data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) &
 				DA9063_COUNT_MONTH_MASK;

 	data[RTC_YEAR] &= ~DA9063_COUNT_YEAR_MASK;
 	data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) &
 				DA9063_COUNT_YEAR_MASK;
 }

 static int da9063_rtc_stop_alarm(struct device *dev)
 {
 	struct da9063_rtc *rtc = dev_get_drvdata(dev);

 	return regmap_update_bits(rtc->hw->regmap, rtc->alarm_year,
 				  DA9063_ALARM_ON, 0);
 }

 static int da9063_rtc_start_alarm(struct device *dev)
 {
 	struct da9063_rtc *rtc = dev_get_drvdata(dev);

 	return regmap_update_bits(rtc->hw->regmap, rtc->alarm_year,
 				  DA9063_ALARM_ON, DA9063_ALARM_ON);
 }

 static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct da9063_rtc *rtc = dev_get_drvdata(dev);
 	unsigned long tm_secs;
 	unsigned long al_secs;
 	u8 data[RTC_DATA_LEN];
 	int ret;

 	ret = regmap_bulk_read(rtc->hw->regmap, DA9063_REG_COUNT_S,
 			       data, RTC_DATA_LEN);
 	if (ret < 0) {
 		dev_err(dev, "Failed to read RTC time data: %d\n", ret);
 		return ret;
 	}

 	if (!(data[RTC_SEC] & DA9063_RTC_READ)) {
 		dev_dbg(dev, "RTC not yet ready to be read by the host\n");
 		return -EINVAL;
 	}

 	da9063_data_to_tm(data, tm);

 	rtc_tm_to_time(tm, &tm_secs);
 	rtc_tm_to_time(&rtc->alarm_time, &al_secs);

 	/* handle the rtc synchronisation delay */
 	if (rtc->rtc_sync == true && al_secs - tm_secs == 1)
 		memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
 	else
 		rtc->rtc_sync = false;

 	return rtc_valid_tm(tm);
 }

 static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct da9063_rtc *rtc = dev_get_drvdata(dev);
 	u8 data[RTC_DATA_LEN];
 	int ret;

 	da9063_tm_to_data(tm, data);
 	ret = regmap_bulk_write(rtc->hw->regmap, DA9063_REG_COUNT_S,
 				data, RTC_DATA_LEN);
 	if (ret < 0)
 		dev_err(dev, "Failed to set RTC time data: %d\n", ret);

 	return ret;
 }

 static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct da9063_rtc *rtc = dev_get_drvdata(dev);
 	u8 data[RTC_DATA_LEN];
 	int ret;
 	unsigned int val;

 	data[RTC_SEC] = 0;
 	ret = regmap_bulk_read(rtc->hw->regmap, rtc->alarm_start,
 			       &data[rtc->data_start], rtc->alarm_len);
 	if (ret < 0)
 		return ret;

 	da9063_data_to_tm(data, &alrm->time);

 	alrm->enabled = !!(data[RTC_YEAR] & DA9063_ALARM_ON);

 	ret = regmap_read(rtc->hw->regmap, DA9063_REG_EVENT_A, &val);
 	if (ret < 0)
 		return ret;

 	if (val & (DA9063_E_ALARM))
 		alrm->pending = 1;
 	else
 		alrm->pending = 0;

 	return 0;
 }

 static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct da9063_rtc *rtc = dev_get_drvdata(dev);
 	u8 data[RTC_DATA_LEN];
 	int ret;

 	da9063_tm_to_data(&alrm->time, data);

 	ret = da9063_rtc_stop_alarm(dev);
 	if (ret < 0) {
 		dev_err(dev, "Failed to stop alarm: %d\n", ret);
 		return ret;
 	}

 	ret = regmap_bulk_write(rtc->hw->regmap, rtc->alarm_start,
 			       &data[rtc->data_start], rtc->alarm_len);
 	if (ret < 0) {
 		dev_err(dev, "Failed to write alarm: %d\n", ret);
 		return ret;
 	}

 	da9063_data_to_tm(data, &rtc->alarm_time);

 	if (alrm->enabled) {
 		ret = da9063_rtc_start_alarm(dev);
 		if (ret < 0) {
 			dev_err(dev, "Failed to start alarm: %d\n", ret);
 			return ret;
 		}
 	}

 	return ret;
 }

 static int da9063_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	if (enabled)
 		return da9063_rtc_start_alarm(dev);
 	else
 		return da9063_rtc_stop_alarm(dev);
 }

 static irqreturn_t da9063_alarm_event(int irq, void *data)
 {
 	struct da9063_rtc *rtc = data;

 	regmap_update_bits(rtc->hw->regmap, rtc->alarm_year,
 			   DA9063_ALARM_ON, 0);

 	rtc->rtc_sync = true;
 	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);

 	return IRQ_HANDLED;
 }

 static const struct rtc_class_ops da9063_rtc_ops = {
 	.read_time = da9063_rtc_read_time,
 	.set_time = da9063_rtc_set_time,
 	.read_alarm = da9063_rtc_read_alarm,
 	.set_alarm = da9063_rtc_set_alarm,
 	.alarm_irq_enable = da9063_rtc_alarm_irq_enable,
 };

 static int da9063_rtc_probe(struct platform_device *pdev)
 {
 	struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
 	struct da9063_rtc *rtc;
 	int irq_alarm;
 	u8 data[RTC_DATA_LEN];
 	int ret;

 	ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_E,
 				 DA9063_RTC_EN, DA9063_RTC_EN);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to enable RTC\n");
 		goto err;
 	}

 	ret = regmap_update_bits(da9063->regmap, DA9063_REG_EN_32K,
 				 DA9063_CRYSTAL, DA9063_CRYSTAL);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
 		goto err;
 	}

 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
 	if (!rtc)
 		return -ENOMEM;

 	if (da9063->variant_code == PMIC_DA9063_AD) {
 		rtc->alarm_year = DA9063_AD_REG_ALARM_Y;
 		rtc->alarm_start = DA9063_AD_REG_ALARM_MI;
 		rtc->alarm_len = RTC_ALARM_DATA_LEN;
 		rtc->data_start = RTC_MIN;
 	} else {
 		rtc->alarm_year = DA9063_BB_REG_ALARM_Y;
 		rtc->alarm_start = DA9063_BB_REG_ALARM_S;
 		rtc->alarm_len = RTC_DATA_LEN;
 		rtc->data_start = RTC_SEC;
 	}

 	ret = regmap_update_bits(da9063->regmap, rtc->alarm_start,
 			DA9063_ALARM_STATUS_TICK | DA9063_ALARM_STATUS_ALARM,
 			0);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
 		goto err;
 	}

 	ret = regmap_update_bits(da9063->regmap, rtc->alarm_start,
 				 DA9063_ALARM_STATUS_ALARM,
 				 DA9063_ALARM_STATUS_ALARM);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
 		goto err;
 	}

 	ret = regmap_update_bits(da9063->regmap, rtc->alarm_year,
 				 DA9063_TICK_ON, 0);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to disable TICKs\n");
 		goto err;
 	}

 	data[RTC_SEC] = 0;
 	ret = regmap_bulk_read(da9063->regmap, rtc->alarm_start,
 			       &data[rtc->data_start], rtc->alarm_len);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
 			ret);
 		goto err;
 	}

 	platform_set_drvdata(pdev, rtc);

 	irq_alarm = platform_get_irq_byname(pdev, "ALARM");
 	ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
 					da9063_alarm_event,
 					IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 					"ALARM", rtc);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
 			irq_alarm, ret);
 		goto err;
 	}

 	rtc->hw = da9063;
 	rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC,
 					   &da9063_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc->rtc_dev))
 		return PTR_ERR(rtc->rtc_dev);

 	da9063_data_to_tm(data, &rtc->alarm_time);
 	rtc->rtc_sync = false;
 err:
 	return ret;
 }

 static struct platform_driver da9063_rtc_driver = {
 	.probe		= da9063_rtc_probe,
 	.driver		= {
 		.name	= DA9063_DRVNAME_RTC,
 	},
 };

 module_platform_driver(da9063_rtc_driver);

 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);
	/* rtc-da9063.c - Real time clock device driver for DA9063
	* Copyright (C) 2013-14 Dialog Semiconductor Ltd.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/rtc.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/regmap.h>
	#include <linux/mfd/da9063/registers.h>
	#include <linux/mfd/da9063/core.h>

	#define YEARS_TO_DA9063(year) ((year) - 100)
	#define MONTHS_TO_DA9063(month) ((month) + 1)
	#define YEARS_FROM_DA9063(year) ((year) + 100)
	#define MONTHS_FROM_DA9063(month) ((month) - 1)

	#define RTC_ALARM_DATA_LEN (DA9063_AD_REG_ALARM_Y - DA9063_AD_REG_ALARM_MI + 1)

	#define RTC_DATA_LEN (DA9063_REG_COUNT_Y - DA9063_REG_COUNT_S + 1)
	#define RTC_SEC 0
	#define RTC_MIN 1
	#define RTC_HOUR 2
	#define RTC_DAY 3
	#define RTC_MONTH 4
	#define RTC_YEAR 5

	struct da9063_rtc {
	struct rtc_device *rtc_dev;
	struct da9063 *hw;
	struct rtc_time alarm_time;
	bool rtc_sync;
	int alarm_year;
	int alarm_start;
	int alarm_len;
	int data_start;
	};

	static void da9063_data_to_tm(u8 data, struct rtc_time tm)
	{
	tm->tm_sec = data[RTC_SEC] & DA9063_COUNT_SEC_MASK;
	tm->tm_min = data[RTC_MIN] & DA9063_COUNT_MIN_MASK;
	tm->tm_hour = data[RTC_HOUR] & DA9063_COUNT_HOUR_MASK;
	tm->tm_mday = data[RTC_DAY] & DA9063_COUNT_DAY_MASK;
	tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] &
	DA9063_COUNT_MONTH_MASK);
	tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
	DA9063_COUNT_YEAR_MASK);
	}

	static void da9063_tm_to_data(struct rtc_time tm, u8 data)
	{
	data[RTC_SEC] &= ~DA9063_COUNT_SEC_MASK;
	data[RTC_SEC] \|= tm->tm_sec & DA9063_COUNT_SEC_MASK;

	data[RTC_MIN] &= ~DA9063_COUNT_MIN_MASK;
	data[RTC_MIN] \|= tm->tm_min & DA9063_COUNT_MIN_MASK;

	data[RTC_HOUR] &= ~DA9063_COUNT_HOUR_MASK;
	data[RTC_HOUR] \|= tm->tm_hour & DA9063_COUNT_HOUR_MASK;

	data[RTC_DAY] &= ~DA9063_COUNT_DAY_MASK;
	data[RTC_DAY] \|= tm->tm_mday & DA9063_COUNT_DAY_MASK;

	data[RTC_MONTH] &= ~DA9063_COUNT_MONTH_MASK;
	data[RTC_MONTH] \|= MONTHS_TO_DA9063(tm->tm_mon) &
	DA9063_COUNT_MONTH_MASK;

	data[RTC_YEAR] &= ~DA9063_COUNT_YEAR_MASK;
	data[RTC_YEAR] \|= YEARS_TO_DA9063(tm->tm_year) &
	DA9063_COUNT_YEAR_MASK;
	}

	static int da9063_rtc_stop_alarm(struct device *dev)
	{
	struct da9063_rtc *rtc = dev_get_drvdata(dev);

	return regmap_update_bits(rtc->hw->regmap, rtc->alarm_year,
	DA9063_ALARM_ON, 0);
	}

	static int da9063_rtc_start_alarm(struct device *dev)
	{
	struct da9063_rtc *rtc = dev_get_drvdata(dev);

	return regmap_update_bits(rtc->hw->regmap, rtc->alarm_year,
	DA9063_ALARM_ON, DA9063_ALARM_ON);
	}

	static int da9063_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	struct da9063_rtc *rtc = dev_get_drvdata(dev);
	unsigned long tm_secs;
	unsigned long al_secs;
	u8 data[RTC_DATA_LEN];
	int ret;

	ret = regmap_bulk_read(rtc->hw->regmap, DA9063_REG_COUNT_S,
	data, RTC_DATA_LEN);
	if (ret < 0) {
	dev_err(dev, "Failed to read RTC time data: %d\n", ret);
	return ret;
	}

	if (!(data[RTC_SEC] & DA9063_RTC_READ)) {
	dev_dbg(dev, "RTC not yet ready to be read by the host\n");
	return -EINVAL;
	}

	da9063_data_to_tm(data, tm);

	rtc_tm_to_time(tm, &tm_secs);
	rtc_tm_to_time(&rtc->alarm_time, &al_secs);

	/* handle the rtc synchronisation delay */
	if (rtc->rtc_sync == true && al_secs - tm_secs == 1)
	memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
	else
	rtc->rtc_sync = false;

	return rtc_valid_tm(tm);
	}

	static int da9063_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	struct da9063_rtc *rtc = dev_get_drvdata(dev);
	u8 data[RTC_DATA_LEN];
	int ret;

	da9063_tm_to_data(tm, data);
	ret = regmap_bulk_write(rtc->hw->regmap, DA9063_REG_COUNT_S,
	data, RTC_DATA_LEN);
	if (ret < 0)
	dev_err(dev, "Failed to set RTC time data: %d\n", ret);

	return ret;
	}

	static int da9063_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct da9063_rtc *rtc = dev_get_drvdata(dev);
	u8 data[RTC_DATA_LEN];
	int ret;
	unsigned int val;

	data[RTC_SEC] = 0;
	ret = regmap_bulk_read(rtc->hw->regmap, rtc->alarm_start,
	&data[rtc->data_start], rtc->alarm_len);
	if (ret < 0)
	return ret;

	da9063_data_to_tm(data, &alrm->time);

	alrm->enabled = !!(data[RTC_YEAR] & DA9063_ALARM_ON);

	ret = regmap_read(rtc->hw->regmap, DA9063_REG_EVENT_A, &val);
	if (ret < 0)
	return ret;

	if (val & (DA9063_E_ALARM))
	alrm->pending = 1;
	else
	alrm->pending = 0;

	return 0;
	}

	static int da9063_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct da9063_rtc *rtc = dev_get_drvdata(dev);
	u8 data[RTC_DATA_LEN];
	int ret;

	da9063_tm_to_data(&alrm->time, data);

	ret = da9063_rtc_stop_alarm(dev);
	if (ret < 0) {
	dev_err(dev, "Failed to stop alarm: %d\n", ret);
	return ret;
	}

	ret = regmap_bulk_write(rtc->hw->regmap, rtc->alarm_start,
	&data[rtc->data_start], rtc->alarm_len);
	if (ret < 0) {
	dev_err(dev, "Failed to write alarm: %d\n", ret);
	return ret;
	}

	da9063_data_to_tm(data, &rtc->alarm_time);

	if (alrm->enabled) {
	ret = da9063_rtc_start_alarm(dev);
	if (ret < 0) {
	dev_err(dev, "Failed to start alarm: %d\n", ret);
	return ret;
	}
	}

	return ret;
	}

	static int da9063_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	{
	if (enabled)
	return da9063_rtc_start_alarm(dev);
	else
	return da9063_rtc_stop_alarm(dev);
	}

	static irqreturn_t da9063_alarm_event(int irq, void *data)
	{
	struct da9063_rtc *rtc = data;

	regmap_update_bits(rtc->hw->regmap, rtc->alarm_year,
	DA9063_ALARM_ON, 0);

	rtc->rtc_sync = true;
	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF \| RTC_AF);

	return IRQ_HANDLED;
	}

	static const struct rtc_class_ops da9063_rtc_ops = {
	.read_time = da9063_rtc_read_time,
	.set_time = da9063_rtc_set_time,
	.read_alarm = da9063_rtc_read_alarm,
	.set_alarm = da9063_rtc_set_alarm,
	.alarm_irq_enable = da9063_rtc_alarm_irq_enable,
	};

	static int da9063_rtc_probe(struct platform_device *pdev)
	{
	struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
	struct da9063_rtc *rtc;
	int irq_alarm;
	u8 data[RTC_DATA_LEN];
	int ret;

	ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_E,
	DA9063_RTC_EN, DA9063_RTC_EN);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to enable RTC\n");
	goto err;
	}

	ret = regmap_update_bits(da9063->regmap, DA9063_REG_EN_32K,
	DA9063_CRYSTAL, DA9063_CRYSTAL);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
	goto err;
	}

	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
	if (!rtc)
	return -ENOMEM;

	if (da9063->variant_code == PMIC_DA9063_AD) {
	rtc->alarm_year = DA9063_AD_REG_ALARM_Y;
	rtc->alarm_start = DA9063_AD_REG_ALARM_MI;
	rtc->alarm_len = RTC_ALARM_DATA_LEN;
	rtc->data_start = RTC_MIN;
	} else {
	rtc->alarm_year = DA9063_BB_REG_ALARM_Y;
	rtc->alarm_start = DA9063_BB_REG_ALARM_S;
	rtc->alarm_len = RTC_DATA_LEN;
	rtc->data_start = RTC_SEC;
	}

	ret = regmap_update_bits(da9063->regmap, rtc->alarm_start,
	DA9063_ALARM_STATUS_TICK \| DA9063_ALARM_STATUS_ALARM,
	0);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
	goto err;
	}

	ret = regmap_update_bits(da9063->regmap, rtc->alarm_start,
	DA9063_ALARM_STATUS_ALARM,
	DA9063_ALARM_STATUS_ALARM);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
	goto err;
	}

	ret = regmap_update_bits(da9063->regmap, rtc->alarm_year,
	DA9063_TICK_ON, 0);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to disable TICKs\n");
	goto err;
	}

	data[RTC_SEC] = 0;
	ret = regmap_bulk_read(da9063->regmap, rtc->alarm_start,
	&data[rtc->data_start], rtc->alarm_len);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
	ret);
	goto err;
	}

	platform_set_drvdata(pdev, rtc);

	irq_alarm = platform_get_irq_byname(pdev, "ALARM");
	ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
	da9063_alarm_event,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	"ALARM", rtc);
	if (ret) {
	dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
	irq_alarm, ret);
	goto err;
	}

	rtc->hw = da9063;
	rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC,
	&da9063_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rtc_dev))
	return PTR_ERR(rtc->rtc_dev);

	da9063_data_to_tm(data, &rtc->alarm_time);
	rtc->rtc_sync = false;
	err:
	return ret;
	}

	static struct platform_driver da9063_rtc_driver = {
	.probe = da9063_rtc_probe,
	.driver = {
	.name = DA9063_DRVNAME_RTC,
	},
	};

	module_platform_driver(da9063_rtc_driver);

	MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
	MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);