drivers/rtc/rtc-tps80031.c - linux - Git at Google

 /*
  * rtc-tps80031.c -- TI TPS80031/TPS80032 RTC driver
  *
  * RTC driver for TI TPS80031/TPS80032 Fully Integrated
  * Power Management with Power Path and Battery Charger
  *
  * Copyright (c) 2012, NVIDIA Corporation.
  *
  * Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  * whether express or implied; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  * 02111-1307, USA
  */

 #include <linux/bcd.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mfd/tps80031.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/rtc.h>
 #include <linux/slab.h>

 #define ENABLE_ALARM_INT			0x08
 #define ALARM_INT_STATUS			0x40

 /**
  * Setting bit to 1 in STOP_RTC will run the RTC and
  * setting this bit to 0 will freeze RTC.
  */
 #define STOP_RTC				0x1

 /* Power on reset Values of RTC registers */
 #define TPS80031_RTC_POR_YEAR			0
 #define TPS80031_RTC_POR_MONTH			1
 #define TPS80031_RTC_POR_DAY			1

 /* Numbers of registers for time and alarms */
 #define TPS80031_RTC_TIME_NUM_REGS		7
 #define TPS80031_RTC_ALARM_NUM_REGS		6

 /**
  * PMU RTC have only 2 nibbles to store year information, so using an
  * offset of 100 to set the base year as 2000 for our driver.
  */
 #define RTC_YEAR_OFFSET 100

 struct tps80031_rtc {
 	struct rtc_device	*rtc;
 	int			irq;
 };

 static int tps80031_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	u8 buff[TPS80031_RTC_TIME_NUM_REGS];
 	int ret;

 	ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1,
 			TPS80031_SECONDS_REG, TPS80031_RTC_TIME_NUM_REGS, buff);
 	if (ret < 0) {
 		dev_err(dev, "reading RTC_SECONDS_REG failed, err = %d\n", ret);
 		return ret;
 	}

 	tm->tm_sec = bcd2bin(buff[0]);
 	tm->tm_min = bcd2bin(buff[1]);
 	tm->tm_hour = bcd2bin(buff[2]);
 	tm->tm_mday = bcd2bin(buff[3]);
 	tm->tm_mon = bcd2bin(buff[4]) - 1;
 	tm->tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET;
 	tm->tm_wday = bcd2bin(buff[6]);
 	return 0;
 }

 static int tps80031_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	u8 buff[7];
 	int ret;

 	buff[0] = bin2bcd(tm->tm_sec);
 	buff[1] = bin2bcd(tm->tm_min);
 	buff[2] = bin2bcd(tm->tm_hour);
 	buff[3] = bin2bcd(tm->tm_mday);
 	buff[4] = bin2bcd(tm->tm_mon + 1);
 	buff[5] = bin2bcd(tm->tm_year % RTC_YEAR_OFFSET);
 	buff[6] = bin2bcd(tm->tm_wday);

 	/* Stop RTC while updating the RTC time registers */
 	ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1,
 				TPS80031_RTC_CTRL_REG, STOP_RTC);
 	if (ret < 0) {
 		dev_err(dev->parent, "Stop RTC failed, err = %d\n", ret);
 		return ret;
 	}

 	ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1,
 			TPS80031_SECONDS_REG,
 			TPS80031_RTC_TIME_NUM_REGS, buff);
 	if (ret < 0) {
 		dev_err(dev, "writing RTC_SECONDS_REG failed, err %d\n", ret);
 		return ret;
 	}

 	ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
 				TPS80031_RTC_CTRL_REG, STOP_RTC);
 	if (ret < 0)
 		dev_err(dev->parent, "Start RTC failed, err = %d\n", ret);
 	return ret;
 }

 static int tps80031_rtc_alarm_irq_enable(struct device *dev,
 					 unsigned int enable)
 {
 	int ret;

 	if (enable)
 		ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
 				TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT);
 	else
 		ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1,
 				TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT);
 	if (ret < 0) {
 		dev_err(dev, "Update on RTC_INT failed, err = %d\n", ret);
 		return ret;
 	}
 	return 0;
 }

 static int tps80031_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	u8 buff[TPS80031_RTC_ALARM_NUM_REGS];
 	int ret;

 	buff[0] = bin2bcd(alrm->time.tm_sec);
 	buff[1] = bin2bcd(alrm->time.tm_min);
 	buff[2] = bin2bcd(alrm->time.tm_hour);
 	buff[3] = bin2bcd(alrm->time.tm_mday);
 	buff[4] = bin2bcd(alrm->time.tm_mon + 1);
 	buff[5] = bin2bcd(alrm->time.tm_year % RTC_YEAR_OFFSET);
 	ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1,
 			TPS80031_ALARM_SECONDS_REG,
 			TPS80031_RTC_ALARM_NUM_REGS, buff);
 	if (ret < 0) {
 		dev_err(dev, "Writing RTC_ALARM failed, err %d\n", ret);
 		return ret;
 	}
 	return tps80031_rtc_alarm_irq_enable(dev, alrm->enabled);
 }

 static int tps80031_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	u8 buff[6];
 	int ret;

 	ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1,
 			TPS80031_ALARM_SECONDS_REG,
 			TPS80031_RTC_ALARM_NUM_REGS, buff);
 	if (ret < 0) {
 		dev_err(dev->parent,
 			"reading RTC_ALARM failed, err = %d\n", ret);
 		return ret;
 	}

 	alrm->time.tm_sec = bcd2bin(buff[0]);
 	alrm->time.tm_min = bcd2bin(buff[1]);
 	alrm->time.tm_hour = bcd2bin(buff[2]);
 	alrm->time.tm_mday = bcd2bin(buff[3]);
 	alrm->time.tm_mon = bcd2bin(buff[4]) - 1;
 	alrm->time.tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET;
 	return 0;
 }

 static int clear_alarm_int_status(struct device *dev, struct tps80031_rtc *rtc)
 {
 	int ret;
 	u8 buf;

 	/**
 	 * As per datasheet, A dummy read of this  RTC_STATUS_REG register
 	 * is necessary before each I2C read in order to update the status
 	 * register value.
 	 */
 	ret = tps80031_read(dev->parent, TPS80031_SLAVE_ID1,
 				TPS80031_RTC_STATUS_REG, &buf);
 	if (ret < 0) {
 		dev_err(dev, "reading RTC_STATUS failed. err = %d\n", ret);
 		return ret;
 	}

 	/* clear Alarm status bits.*/
 	ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
 			TPS80031_RTC_STATUS_REG, ALARM_INT_STATUS);
 	if (ret < 0) {
 		dev_err(dev, "clear Alarm INT failed, err = %d\n", ret);
 		return ret;
 	}
 	return 0;
 }

 static irqreturn_t tps80031_rtc_irq(int irq, void *data)
 {
 	struct device *dev = data;
 	struct tps80031_rtc *rtc = dev_get_drvdata(dev);
 	int ret;

 	ret = clear_alarm_int_status(dev, rtc);
 	if (ret < 0)
 		return ret;

 	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
 	return IRQ_HANDLED;
 }

 static const struct rtc_class_ops tps80031_rtc_ops = {
 	.read_time = tps80031_rtc_read_time,
 	.set_time = tps80031_rtc_set_time,
 	.set_alarm = tps80031_rtc_set_alarm,
 	.read_alarm = tps80031_rtc_read_alarm,
 	.alarm_irq_enable = tps80031_rtc_alarm_irq_enable,
 };

 static int tps80031_rtc_probe(struct platform_device *pdev)
 {
 	struct tps80031_rtc *rtc;
 	struct rtc_time tm;
 	int ret;

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

 	rtc->irq = platform_get_irq(pdev, 0);
 	platform_set_drvdata(pdev, rtc);

 	/* Start RTC */
 	ret = tps80031_set_bits(pdev->dev.parent, TPS80031_SLAVE_ID1,
 			TPS80031_RTC_CTRL_REG, STOP_RTC);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to start RTC. err = %d\n", ret);
 		return ret;
 	}

 	/* If RTC have POR values, set time 01:01:2000 */
 	tps80031_rtc_read_time(&pdev->dev, &tm);
 	if ((tm.tm_year == RTC_YEAR_OFFSET + TPS80031_RTC_POR_YEAR) &&
 		(tm.tm_mon == (TPS80031_RTC_POR_MONTH - 1)) &&
 		(tm.tm_mday == TPS80031_RTC_POR_DAY)) {
 		tm.tm_year = 2000;
 		tm.tm_mday = 1;
 		tm.tm_mon = 1;
 		ret = tps80031_rtc_set_time(&pdev->dev, &tm);
 		if (ret < 0) {
 			dev_err(&pdev->dev,
 				"RTC set time failed, err = %d\n", ret);
 			return ret;
 		}
 	}

 	/* Clear alarm intretupt status if it is there */
 	ret = clear_alarm_int_status(&pdev->dev, rtc);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Clear alarm int failed, err = %d\n", ret);
 		return ret;
 	}

 	rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
 			       &tps80031_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc->rtc)) {
 		ret = PTR_ERR(rtc->rtc);
 		dev_err(&pdev->dev, "RTC registration failed, err %d\n", ret);
 		return ret;
 	}

 	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
 			tps80031_rtc_irq,
 			IRQF_ONESHOT | IRQF_EARLY_RESUME,
 			dev_name(&pdev->dev), rtc);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "request IRQ:%d failed, err = %d\n",
 			 rtc->irq, ret);
 		rtc_device_unregister(rtc->rtc);
 		return ret;
 	}
 	device_set_wakeup_capable(&pdev->dev, 1);
 	return 0;
 }

 static int tps80031_rtc_remove(struct platform_device *pdev)
 {
 	struct tps80031_rtc *rtc = platform_get_drvdata(pdev);

 	rtc_device_unregister(rtc->rtc);
 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int tps80031_rtc_suspend(struct device *dev)
 {
 	struct tps80031_rtc *rtc = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev))
 		enable_irq_wake(rtc->irq);
 	return 0;
 }

 static int tps80031_rtc_resume(struct device *dev)
 {
 	struct tps80031_rtc *rtc = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev))
 		disable_irq_wake(rtc->irq);
 	return 0;
 };
 #endif

 static const struct dev_pm_ops tps80031_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(tps80031_rtc_suspend, tps80031_rtc_resume)
 };

 static struct platform_driver tps80031_rtc_driver = {
 	.driver	= {
 		.name	= "tps80031-rtc",
 		.owner	= THIS_MODULE,
 		.pm	= &tps80031_pm_ops,
 	},
 	.probe	= tps80031_rtc_probe,
 	.remove	= tps80031_rtc_remove,
 };

 module_platform_driver(tps80031_rtc_driver);

 MODULE_ALIAS("platform:tps80031-rtc");
 MODULE_DESCRIPTION("TI TPS80031/TPS80032 RTC driver");
 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 MODULE_LICENSE("GPL v2");
	/*
	* rtc-tps80031.c -- TI TPS80031/TPS80032 RTC driver
	*
	* RTC driver for TI TPS80031/TPS80032 Fully Integrated
	* Power Management with Power Path and Battery Charger
	*
	* Copyright (c) 2012, NVIDIA Corporation.
	*
	* Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	* whether express or implied; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	* 02111-1307, USA
	*/

	#include <linux/bcd.h>
	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mfd/tps80031.h>
	#include <linux/platform_device.h>
	#include <linux/pm.h>
	#include <linux/rtc.h>
	#include <linux/slab.h>

	#define ENABLE_ALARM_INT 0x08
	#define ALARM_INT_STATUS 0x40

	/**
	* Setting bit to 1 in STOP_RTC will run the RTC and
	* setting this bit to 0 will freeze RTC.
	*/
	#define STOP_RTC 0x1

	/* Power on reset Values of RTC registers */
	#define TPS80031_RTC_POR_YEAR 0
	#define TPS80031_RTC_POR_MONTH 1
	#define TPS80031_RTC_POR_DAY 1

	/* Numbers of registers for time and alarms */
	#define TPS80031_RTC_TIME_NUM_REGS 7
	#define TPS80031_RTC_ALARM_NUM_REGS 6

	/**
	* PMU RTC have only 2 nibbles to store year information, so using an
	* offset of 100 to set the base year as 2000 for our driver.
	*/
	#define RTC_YEAR_OFFSET 100

	struct tps80031_rtc {
	struct rtc_device *rtc;
	int irq;
	};

	static int tps80031_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	u8 buff[TPS80031_RTC_TIME_NUM_REGS];
	int ret;

	ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_SECONDS_REG, TPS80031_RTC_TIME_NUM_REGS, buff);
	if (ret < 0) {
	dev_err(dev, "reading RTC_SECONDS_REG failed, err = %d\n", ret);
	return ret;
	}

	tm->tm_sec = bcd2bin(buff[0]);
	tm->tm_min = bcd2bin(buff[1]);
	tm->tm_hour = bcd2bin(buff[2]);
	tm->tm_mday = bcd2bin(buff[3]);
	tm->tm_mon = bcd2bin(buff[4]) - 1;
	tm->tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET;
	tm->tm_wday = bcd2bin(buff[6]);
	return 0;
	}

	static int tps80031_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	u8 buff[7];
	int ret;

	buff[0] = bin2bcd(tm->tm_sec);
	buff[1] = bin2bcd(tm->tm_min);
	buff[2] = bin2bcd(tm->tm_hour);
	buff[3] = bin2bcd(tm->tm_mday);
	buff[4] = bin2bcd(tm->tm_mon + 1);
	buff[5] = bin2bcd(tm->tm_year % RTC_YEAR_OFFSET);
	buff[6] = bin2bcd(tm->tm_wday);

	/* Stop RTC while updating the RTC time registers */
	ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_RTC_CTRL_REG, STOP_RTC);
	if (ret < 0) {
	dev_err(dev->parent, "Stop RTC failed, err = %d\n", ret);
	return ret;
	}

	ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_SECONDS_REG,
	TPS80031_RTC_TIME_NUM_REGS, buff);
	if (ret < 0) {
	dev_err(dev, "writing RTC_SECONDS_REG failed, err %d\n", ret);
	return ret;
	}

	ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_RTC_CTRL_REG, STOP_RTC);
	if (ret < 0)
	dev_err(dev->parent, "Start RTC failed, err = %d\n", ret);
	return ret;
	}

	static int tps80031_rtc_alarm_irq_enable(struct device *dev,
	unsigned int enable)
	{
	int ret;

	if (enable)
	ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT);
	else
	ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT);
	if (ret < 0) {
	dev_err(dev, "Update on RTC_INT failed, err = %d\n", ret);
	return ret;
	}
	return 0;
	}

	static int tps80031_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	u8 buff[TPS80031_RTC_ALARM_NUM_REGS];
	int ret;

	buff[0] = bin2bcd(alrm->time.tm_sec);
	buff[1] = bin2bcd(alrm->time.tm_min);
	buff[2] = bin2bcd(alrm->time.tm_hour);
	buff[3] = bin2bcd(alrm->time.tm_mday);
	buff[4] = bin2bcd(alrm->time.tm_mon + 1);
	buff[5] = bin2bcd(alrm->time.tm_year % RTC_YEAR_OFFSET);
	ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_ALARM_SECONDS_REG,
	TPS80031_RTC_ALARM_NUM_REGS, buff);
	if (ret < 0) {
	dev_err(dev, "Writing RTC_ALARM failed, err %d\n", ret);
	return ret;
	}
	return tps80031_rtc_alarm_irq_enable(dev, alrm->enabled);
	}

	static int tps80031_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	u8 buff[6];
	int ret;

	ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_ALARM_SECONDS_REG,
	TPS80031_RTC_ALARM_NUM_REGS, buff);
	if (ret < 0) {
	dev_err(dev->parent,
	"reading RTC_ALARM failed, err = %d\n", ret);
	return ret;
	}

	alrm->time.tm_sec = bcd2bin(buff[0]);
	alrm->time.tm_min = bcd2bin(buff[1]);
	alrm->time.tm_hour = bcd2bin(buff[2]);
	alrm->time.tm_mday = bcd2bin(buff[3]);
	alrm->time.tm_mon = bcd2bin(buff[4]) - 1;
	alrm->time.tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET;
	return 0;
	}

	static int clear_alarm_int_status(struct device dev, struct tps80031_rtc rtc)
	{
	int ret;
	u8 buf;

	/**
	* As per datasheet, A dummy read of this RTC_STATUS_REG register
	* is necessary before each I2C read in order to update the status
	* register value.
	*/
	ret = tps80031_read(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_RTC_STATUS_REG, &buf);
	if (ret < 0) {
	dev_err(dev, "reading RTC_STATUS failed. err = %d\n", ret);
	return ret;
	}

	/* clear Alarm status bits.*/
	ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
	TPS80031_RTC_STATUS_REG, ALARM_INT_STATUS);
	if (ret < 0) {
	dev_err(dev, "clear Alarm INT failed, err = %d\n", ret);
	return ret;
	}
	return 0;
	}

	static irqreturn_t tps80031_rtc_irq(int irq, void *data)
	{
	struct device *dev = data;
	struct tps80031_rtc *rtc = dev_get_drvdata(dev);
	int ret;

	ret = clear_alarm_int_status(dev, rtc);
	if (ret < 0)
	return ret;

	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	return IRQ_HANDLED;
	}

	static const struct rtc_class_ops tps80031_rtc_ops = {
	.read_time = tps80031_rtc_read_time,
	.set_time = tps80031_rtc_set_time,
	.set_alarm = tps80031_rtc_set_alarm,
	.read_alarm = tps80031_rtc_read_alarm,
	.alarm_irq_enable = tps80031_rtc_alarm_irq_enable,
	};

	static int tps80031_rtc_probe(struct platform_device *pdev)
	{
	struct tps80031_rtc *rtc;
	struct rtc_time tm;
	int ret;

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

	rtc->irq = platform_get_irq(pdev, 0);
	platform_set_drvdata(pdev, rtc);

	/* Start RTC */
	ret = tps80031_set_bits(pdev->dev.parent, TPS80031_SLAVE_ID1,
	TPS80031_RTC_CTRL_REG, STOP_RTC);
	if (ret < 0) {
	dev_err(&pdev->dev, "failed to start RTC. err = %d\n", ret);
	return ret;
	}

	/* If RTC have POR values, set time 01:01:2000 */
	tps80031_rtc_read_time(&pdev->dev, &tm);
	if ((tm.tm_year == RTC_YEAR_OFFSET + TPS80031_RTC_POR_YEAR) &&
	(tm.tm_mon == (TPS80031_RTC_POR_MONTH - 1)) &&
	(tm.tm_mday == TPS80031_RTC_POR_DAY)) {
	tm.tm_year = 2000;
	tm.tm_mday = 1;
	tm.tm_mon = 1;
	ret = tps80031_rtc_set_time(&pdev->dev, &tm);
	if (ret < 0) {
	dev_err(&pdev->dev,
	"RTC set time failed, err = %d\n", ret);
	return ret;
	}
	}

	/* Clear alarm intretupt status if it is there */
	ret = clear_alarm_int_status(&pdev->dev, rtc);
	if (ret < 0) {
	dev_err(&pdev->dev, "Clear alarm int failed, err = %d\n", ret);
	return ret;
	}

	rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
	&tps80031_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rtc)) {
	ret = PTR_ERR(rtc->rtc);
	dev_err(&pdev->dev, "RTC registration failed, err %d\n", ret);
	return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
	tps80031_rtc_irq,
	IRQF_ONESHOT \| IRQF_EARLY_RESUME,
	dev_name(&pdev->dev), rtc);
	if (ret < 0) {
	dev_err(&pdev->dev, "request IRQ:%d failed, err = %d\n",
	rtc->irq, ret);
	rtc_device_unregister(rtc->rtc);
	return ret;
	}
	device_set_wakeup_capable(&pdev->dev, 1);
	return 0;
	}

	static int tps80031_rtc_remove(struct platform_device *pdev)
	{
	struct tps80031_rtc *rtc = platform_get_drvdata(pdev);

	rtc_device_unregister(rtc->rtc);
	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int tps80031_rtc_suspend(struct device *dev)
	{
	struct tps80031_rtc *rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
	enable_irq_wake(rtc->irq);
	return 0;
	}

	static int tps80031_rtc_resume(struct device *dev)
	{
	struct tps80031_rtc *rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
	disable_irq_wake(rtc->irq);
	return 0;
	};
	#endif

	static const struct dev_pm_ops tps80031_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(tps80031_rtc_suspend, tps80031_rtc_resume)
	};

	static struct platform_driver tps80031_rtc_driver = {
	.driver = {
	.name = "tps80031-rtc",
	.owner = THIS_MODULE,
	.pm = &tps80031_pm_ops,
	},
	.probe = tps80031_rtc_probe,
	.remove = tps80031_rtc_remove,
	};

	module_platform_driver(tps80031_rtc_driver);

	MODULE_ALIAS("platform:tps80031-rtc");
	MODULE_DESCRIPTION("TI TPS80031/TPS80032 RTC driver");
	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	MODULE_LICENSE("GPL v2");