drivers/rtc/rtc-da9055.c - maze/linux - Git at Google

 /*
  * Real time clock driver for DA9055
  *
  * Copyright(c) 2012 Dialog Semiconductor Ltd.
  *
  * Author: Dajun Dajun Chen <dajun.chen@diasemi.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.
  *
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/rtc.h>

 #include <linux/mfd/da9055/core.h>
 #include <linux/mfd/da9055/reg.h>
 #include <linux/mfd/da9055/pdata.h>

 struct da9055_rtc {
 	struct rtc_device *rtc;
 	struct da9055 *da9055;
 	int alarm_enable;
 };

 static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)
 {
 	int ret;
 	if (enable) {
 		ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
 					DA9055_RTC_ALM_EN,
 					DA9055_RTC_ALM_EN);
 		if (ret != 0)
 			dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",
 				ret);
 		rtc->alarm_enable = 1;
 	} else {
 		ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
 					DA9055_RTC_ALM_EN, 0);
 		if (ret != 0)
 			dev_err(rtc->da9055->dev,
 				"Failed to disable ALM: %d\n", ret);
 		rtc->alarm_enable = 0;
 	}
 	return ret;
 }

 static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)
 {
 	struct da9055_rtc *rtc = data;

 	da9055_rtc_enable_alarm(rtc, 0);
 	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);

 	return IRQ_HANDLED;
 }

 static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
 {
 	int ret;
 	uint8_t v[5];

 	ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
 	if (ret != 0) {
 		dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
 		return ret;
 	}

 	rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
 	rtc_tm->tm_mon  = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
 	rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
 	rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
 	rtc_tm->tm_min  = v[0] & DA9055_RTC_ALM_MIN;

 	return rtc_valid_tm(rtc_tm);
 }

 static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
 {
 	int ret;
 	uint8_t v[2];

 	rtc_tm->tm_year -= 100;
 	rtc_tm->tm_mon += 1;

 	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
 				DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
 	if (ret != 0) {
 		dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);
 		return ret;
 	}

 	v[0] = rtc_tm->tm_hour;
 	v[1] = rtc_tm->tm_mday;

 	ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
 	if (ret < 0)
 		return ret;

 	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
 				DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);
 	if (ret < 0)
 		dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);

 	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,
 				DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);
 	if (ret < 0)
 		dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);

 	return ret;
 }

 static int da9055_rtc_get_alarm_status(struct da9055 *da9055)
 {
 	int ret;

 	ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);
 	if (ret < 0) {
 		dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);
 		return ret;
 	}
 	ret &= DA9055_RTC_ALM_EN;
 	return (ret > 0) ? 1 : 0;
 }

 static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
 {
 	struct da9055_rtc *rtc = dev_get_drvdata(dev);
 	uint8_t v[6];
 	int ret;

 	ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);
 	if (ret < 0)
 		return ret;

 	/*
 	 * Registers are only valid when RTC_READ
 	 * status bit is asserted
 	 */
 	if (!(ret & DA9055_RTC_READ))
 		return -EBUSY;

 	ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
 	if (ret < 0) {
 		dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",
 			ret);
 		return ret;
 	}

 	rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;
 	rtc_tm->tm_mon  = (v[4] & DA9055_RTC_MONTH) - 1;
 	rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;
 	rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;
 	rtc_tm->tm_min  = v[1] & DA9055_RTC_MIN;
 	rtc_tm->tm_sec  = v[0] & DA9055_RTC_SEC;

 	return rtc_valid_tm(rtc_tm);
 }

 static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct da9055_rtc *rtc;
 	uint8_t v[6];

 	rtc = dev_get_drvdata(dev);

 	v[0] = tm->tm_sec;
 	v[1] = tm->tm_min;
 	v[2] = tm->tm_hour;
 	v[3] = tm->tm_mday;
 	v[4] = tm->tm_mon + 1;
 	v[5] = tm->tm_year - 100;

 	return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
 }

 static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	int ret;
 	struct rtc_time *tm = &alrm->time;
 	struct da9055_rtc *rtc = dev_get_drvdata(dev);

 	ret = da9055_read_alarm(rtc->da9055, tm);

 	if (ret)
 		return ret;

 	alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);

 	return 0;
 }

 static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	int ret;
 	struct rtc_time *tm = &alrm->time;
 	struct da9055_rtc *rtc = dev_get_drvdata(dev);

 	ret = da9055_rtc_enable_alarm(rtc, 0);
 	if (ret < 0)
 		return ret;

 	ret = da9055_set_alarm(rtc->da9055, tm);
 	if (ret)
 		return ret;

 	ret = da9055_rtc_enable_alarm(rtc, 1);

 	return ret;
 }

 static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct da9055_rtc *rtc = dev_get_drvdata(dev);

 	return da9055_rtc_enable_alarm(rtc, enabled);
 }

 static const struct rtc_class_ops da9055_rtc_ops = {
 	.read_time	= da9055_rtc_read_time,
 	.set_time	= da9055_rtc_set_time,
 	.read_alarm	= da9055_rtc_read_alarm,
 	.set_alarm	= da9055_rtc_set_alarm,
 	.alarm_irq_enable = da9055_rtc_alarm_irq_enable,
 };

 static int da9055_rtc_device_init(struct da9055 *da9055,
 					struct da9055_pdata *pdata)
 {
 	int ret;

 	/* Enable RTC and the internal Crystal */
 	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
 				DA9055_RTC_EN, DA9055_RTC_EN);
 	if (ret < 0)
 		return ret;
 	ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,
 				DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);
 	if (ret < 0)
 		return ret;

 	/* Enable RTC in Power Down mode */
 	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
 				DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);
 	if (ret < 0)
 		return ret;

 	/* Enable RTC in Reset mode */
 	if (pdata && pdata->reset_enable) {
 		ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
 					DA9055_RTC_MODE_SD,
 					DA9055_RTC_MODE_SD <<
 					DA9055_RTC_MODE_SD_SHIFT);
 		if (ret < 0)
 			return ret;
 	}

 	/* Disable the RTC TICK ALM */
 	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
 				DA9055_RTC_TICK_WAKE_MASK, 0);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int da9055_rtc_probe(struct platform_device *pdev)
 {
 	struct da9055_rtc *rtc;
 	struct da9055_pdata *pdata = NULL;
 	int ret, alm_irq;

 	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);
 	if (!rtc)
 		return -ENOMEM;

 	rtc->da9055 = dev_get_drvdata(pdev->dev.parent);
 	pdata = rtc->da9055->dev->platform_data;
 	platform_set_drvdata(pdev, rtc);

 	ret = da9055_rtc_device_init(rtc->da9055, pdata);
 	if (ret < 0)
 		goto err_rtc;

 	ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);
 	if (ret < 0)
 		goto err_rtc;

 	if (ret & DA9055_RTC_ALM_EN)
 		rtc->alarm_enable = 1;

 	device_init_wakeup(&pdev->dev, 1);

 	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
 					&da9055_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc->rtc)) {
 		ret = PTR_ERR(rtc->rtc);
 		goto err_rtc;
 	}

 	alm_irq = platform_get_irq_byname(pdev, "ALM");
 	alm_irq = regmap_irq_get_virq(rtc->da9055->irq_data, alm_irq);
 	ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
 					da9055_rtc_alm_irq,
 					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 					"ALM", rtc);
 	if (ret != 0)
 		dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);

 err_rtc:
 	return ret;

 }

 #ifdef CONFIG_PM
 /* Turn off the alarm if it should not be a wake source. */
 static int da9055_rtc_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
 	int ret;

 	if (!device_may_wakeup(&pdev->dev)) {
 		/* Disable the ALM IRQ */
 		ret = da9055_rtc_enable_alarm(rtc, 0);
 		if (ret < 0)
 			dev_err(&pdev->dev, "Failed to disable RTC ALM\n");
 	}

 	return 0;
 }

 /* Enable the alarm if it should be enabled (in case it was disabled to
  * prevent use as a wake source).
  */
 static int da9055_rtc_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
 	int ret;

 	if (!device_may_wakeup(&pdev->dev)) {
 		if (rtc->alarm_enable) {
 			ret = da9055_rtc_enable_alarm(rtc, 1);
 			if (ret < 0)
 				dev_err(&pdev->dev,
 					"Failed to restart RTC ALM\n");
 		}
 	}

 	return 0;
 }

 /* Unconditionally disable the alarm */
 static int da9055_rtc_freeze(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
 	int ret;

 	ret = da9055_rtc_enable_alarm(rtc, 0);
 	if (ret < 0)
 		dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");

 	return 0;

 }
 #else
 #define da9055_rtc_suspend NULL
 #define da9055_rtc_resume NULL
 #define da9055_rtc_freeze NULL
 #endif

 static const struct dev_pm_ops da9055_rtc_pm_ops = {
 	.suspend = da9055_rtc_suspend,
 	.resume = da9055_rtc_resume,

 	.freeze = da9055_rtc_freeze,
 	.thaw = da9055_rtc_resume,
 	.restore = da9055_rtc_resume,

 	.poweroff = da9055_rtc_suspend,
 };

 static struct platform_driver da9055_rtc_driver = {
 	.probe  = da9055_rtc_probe,
 	.driver = {
 		.name   = "da9055-rtc",
 		.owner  = THIS_MODULE,
 		.pm = &da9055_rtc_pm_ops,
 	},
 };

 module_platform_driver(da9055_rtc_driver);

 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:da9055-rtc");
	/*
	* Real time clock driver for DA9055
	*
	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	*
	* Author: Dajun Dajun Chen <dajun.chen@diasemi.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.
	*
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/rtc.h>

	#include <linux/mfd/da9055/core.h>
	#include <linux/mfd/da9055/reg.h>
	#include <linux/mfd/da9055/pdata.h>

	struct da9055_rtc {
	struct rtc_device *rtc;
	struct da9055 *da9055;
	int alarm_enable;
	};

	static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)
	{
	int ret;
	if (enable) {
	ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
	DA9055_RTC_ALM_EN,
	DA9055_RTC_ALM_EN);
	if (ret != 0)
	dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",
	ret);
	rtc->alarm_enable = 1;
	} else {
	ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
	DA9055_RTC_ALM_EN, 0);
	if (ret != 0)
	dev_err(rtc->da9055->dev,
	"Failed to disable ALM: %d\n", ret);
	rtc->alarm_enable = 0;
	}
	return ret;
	}

	static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)
	{
	struct da9055_rtc *rtc = data;

	da9055_rtc_enable_alarm(rtc, 0);
	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);

	return IRQ_HANDLED;
	}

	static int da9055_read_alarm(struct da9055 da9055, struct rtc_time rtc_tm)
	{
	int ret;
	uint8_t v[5];

	ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
	if (ret != 0) {
	dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
	return ret;
	}

	rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
	rtc_tm->tm_mon = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
	rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
	rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
	rtc_tm->tm_min = v[0] & DA9055_RTC_ALM_MIN;

	return rtc_valid_tm(rtc_tm);
	}

	static int da9055_set_alarm(struct da9055 da9055, struct rtc_time rtc_tm)
	{
	int ret;
	uint8_t v[2];

	rtc_tm->tm_year -= 100;
	rtc_tm->tm_mon += 1;

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
	DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
	if (ret != 0) {
	dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);
	return ret;
	}

	v[0] = rtc_tm->tm_hour;
	v[1] = rtc_tm->tm_mday;

	ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
	if (ret < 0)
	return ret;

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
	DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);
	if (ret < 0)
	dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,
	DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);
	if (ret < 0)
	dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);

	return ret;
	}

	static int da9055_rtc_get_alarm_status(struct da9055 *da9055)
	{
	int ret;

	ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);
	if (ret < 0) {
	dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);
	return ret;
	}
	ret &= DA9055_RTC_ALM_EN;
	return (ret > 0) ? 1 : 0;
	}

	static int da9055_rtc_read_time(struct device dev, struct rtc_time rtc_tm)
	{
	struct da9055_rtc *rtc = dev_get_drvdata(dev);
	uint8_t v[6];
	int ret;

	ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);
	if (ret < 0)
	return ret;

	/*
	* Registers are only valid when RTC_READ
	* status bit is asserted
	*/
	if (!(ret & DA9055_RTC_READ))
	return -EBUSY;

	ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
	if (ret < 0) {
	dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",
	ret);
	return ret;
	}

	rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;
	rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1;
	rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;
	rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;
	rtc_tm->tm_min = v[1] & DA9055_RTC_MIN;
	rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC;

	return rtc_valid_tm(rtc_tm);
	}

	static int da9055_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	struct da9055_rtc *rtc;
	uint8_t v[6];

	rtc = dev_get_drvdata(dev);

	v[0] = tm->tm_sec;
	v[1] = tm->tm_min;
	v[2] = tm->tm_hour;
	v[3] = tm->tm_mday;
	v[4] = tm->tm_mon + 1;
	v[5] = tm->tm_year - 100;

	return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
	}

	static int da9055_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	ret = da9055_read_alarm(rtc->da9055, tm);

	if (ret)
	return ret;

	alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);

	return 0;
	}

	static int da9055_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	ret = da9055_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
	return ret;

	ret = da9055_set_alarm(rtc->da9055, tm);
	if (ret)
	return ret;

	ret = da9055_rtc_enable_alarm(rtc, 1);

	return ret;
	}

	static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	{
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	return da9055_rtc_enable_alarm(rtc, enabled);
	}

	static const struct rtc_class_ops da9055_rtc_ops = {
	.read_time = da9055_rtc_read_time,
	.set_time = da9055_rtc_set_time,
	.read_alarm = da9055_rtc_read_alarm,
	.set_alarm = da9055_rtc_set_alarm,
	.alarm_irq_enable = da9055_rtc_alarm_irq_enable,
	};

	static int da9055_rtc_device_init(struct da9055 *da9055,
	struct da9055_pdata *pdata)
	{
	int ret;

	/* Enable RTC and the internal Crystal */
	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
	DA9055_RTC_EN, DA9055_RTC_EN);
	if (ret < 0)
	return ret;
	ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,
	DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);
	if (ret < 0)
	return ret;

	/* Enable RTC in Power Down mode */
	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
	DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);
	if (ret < 0)
	return ret;

	/* Enable RTC in Reset mode */
	if (pdata && pdata->reset_enable) {
	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
	DA9055_RTC_MODE_SD,
	DA9055_RTC_MODE_SD <<
	DA9055_RTC_MODE_SD_SHIFT);
	if (ret < 0)
	return ret;
	}

	/* Disable the RTC TICK ALM */
	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
	DA9055_RTC_TICK_WAKE_MASK, 0);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int da9055_rtc_probe(struct platform_device *pdev)
	{
	struct da9055_rtc *rtc;
	struct da9055_pdata *pdata = NULL;
	int ret, alm_irq;

	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);
	if (!rtc)
	return -ENOMEM;

	rtc->da9055 = dev_get_drvdata(pdev->dev.parent);
	pdata = rtc->da9055->dev->platform_data;
	platform_set_drvdata(pdev, rtc);

	ret = da9055_rtc_device_init(rtc->da9055, pdata);
	if (ret < 0)
	goto err_rtc;

	ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);
	if (ret < 0)
	goto err_rtc;

	if (ret & DA9055_RTC_ALM_EN)
	rtc->alarm_enable = 1;

	device_init_wakeup(&pdev->dev, 1);

	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
	&da9055_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rtc)) {
	ret = PTR_ERR(rtc->rtc);
	goto err_rtc;
	}

	alm_irq = platform_get_irq_byname(pdev, "ALM");
	alm_irq = regmap_irq_get_virq(rtc->da9055->irq_data, alm_irq);
	ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
	da9055_rtc_alm_irq,
	IRQF_TRIGGER_HIGH \| IRQF_ONESHOT,
	"ALM", rtc);
	if (ret != 0)
	dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);

	err_rtc:
	return ret;

	}

	#ifdef CONFIG_PM
	/* Turn off the alarm if it should not be a wake source. */
	static int da9055_rtc_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	if (!device_may_wakeup(&pdev->dev)) {
	/* Disable the ALM IRQ */
	ret = da9055_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
	dev_err(&pdev->dev, "Failed to disable RTC ALM\n");
	}

	return 0;
	}

	/* Enable the alarm if it should be enabled (in case it was disabled to
	* prevent use as a wake source).
	*/
	static int da9055_rtc_resume(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	if (!device_may_wakeup(&pdev->dev)) {
	if (rtc->alarm_enable) {
	ret = da9055_rtc_enable_alarm(rtc, 1);
	if (ret < 0)
	dev_err(&pdev->dev,
	"Failed to restart RTC ALM\n");
	}
	}

	return 0;
	}

	/* Unconditionally disable the alarm */
	static int da9055_rtc_freeze(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	ret = da9055_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
	dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");

	return 0;

	}
	#else
	#define da9055_rtc_suspend NULL
	#define da9055_rtc_resume NULL
	#define da9055_rtc_freeze NULL
	#endif

	static const struct dev_pm_ops da9055_rtc_pm_ops = {
	.suspend = da9055_rtc_suspend,
	.resume = da9055_rtc_resume,

	.freeze = da9055_rtc_freeze,
	.thaw = da9055_rtc_resume,
	.restore = da9055_rtc_resume,

	.poweroff = da9055_rtc_suspend,
	};

	static struct platform_driver da9055_rtc_driver = {
	.probe = da9055_rtc_probe,
	.driver = {
	.name = "da9055-rtc",
	.owner = THIS_MODULE,
	.pm = &da9055_rtc_pm_ops,
	},
	};

	module_platform_driver(da9055_rtc_driver);

	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:da9055-rtc");