drivers/rtc/rtc-tps65910.c - kernel/msm-4.19 - Gitiles

 /*
  * rtc-tps65910.c -- TPS65910 Real Time Clock interface
  *
  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
  * Author: Venu Byravarasu <vbyravarasu@nvidia.com>
  *
  * Based on original TI driver rtc-twl.c
  *   Copyright (C) 2007 MontaVista Software, Inc
  *   Author: Alexandre Rusev <source@mvista.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/kernel.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/tps65910.h>

 struct tps65910_rtc {
 	struct rtc_device	*rtc;
 	/* To store the list of enabled interrupts */
 	u32 irqstat;
 };

 /* Total number of RTC registers needed to set time*/
 #define NUM_TIME_REGS	(TPS65910_YEARS - TPS65910_SECONDS + 1)

 static int tps65910_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
 {
 	struct tps65910 *tps = dev_get_drvdata(dev->parent);
 	u8 val = 0;

 	if (enabled)
 		val = TPS65910_RTC_INTERRUPTS_IT_ALARM;

 	return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val);
 }

 /*
  * Gets current tps65910 RTC time and date parameters.
  *
  * The RTC's time/alarm representation is not what gmtime(3) requires
  * Linux to use:
  *
  *  - Months are 1..12 vs Linux 0-11
  *  - Years are 0..99 vs Linux 1900..N (we assume 21st century)
  */
 static int tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	unsigned char rtc_data[NUM_TIME_REGS];
 	struct tps65910 *tps = dev_get_drvdata(dev->parent);
 	int ret;

 	/* Copy RTC counting registers to static registers or latches */
 	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
 		TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME);
 	if (ret < 0) {
 		dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret);
 		return ret;
 	}

 	ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data,
 		NUM_TIME_REGS);
 	if (ret < 0) {
 		dev_err(dev, "reading from RTC failed with err:%d\n", ret);
 		return ret;
 	}

 	tm->tm_sec = bcd2bin(rtc_data[0]);
 	tm->tm_min = bcd2bin(rtc_data[1]);
 	tm->tm_hour = bcd2bin(rtc_data[2]);
 	tm->tm_mday = bcd2bin(rtc_data[3]);
 	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
 	tm->tm_year = bcd2bin(rtc_data[5]) + 100;

 	return ret;
 }

 static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	unsigned char rtc_data[NUM_TIME_REGS];
 	struct tps65910 *tps = dev_get_drvdata(dev->parent);
 	int ret;

 	rtc_data[0] = bin2bcd(tm->tm_sec);
 	rtc_data[1] = bin2bcd(tm->tm_min);
 	rtc_data[2] = bin2bcd(tm->tm_hour);
 	rtc_data[3] = bin2bcd(tm->tm_mday);
 	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
 	rtc_data[5] = bin2bcd(tm->tm_year - 100);

 	/* Stop RTC while updating the RTC time registers */
 	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
 		TPS65910_RTC_CTRL_STOP_RTC, 0);
 	if (ret < 0) {
 		dev_err(dev, "RTC stop failed with err:%d\n", ret);
 		return ret;
 	}

 	/* update all the time registers in one shot */
 	ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data,
 		NUM_TIME_REGS);
 	if (ret < 0) {
 		dev_err(dev, "rtc_set_time error %d\n", ret);
 		return ret;
 	}

 	/* Start back RTC */
 	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
 		TPS65910_RTC_CTRL_STOP_RTC, 1);
 	if (ret < 0)
 		dev_err(dev, "RTC start failed with err:%d\n", ret);

 	return ret;
 }

 /*
  * Gets current tps65910 RTC alarm time.
  */
 static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
 {
 	unsigned char alarm_data[NUM_TIME_REGS];
 	u32 int_val;
 	struct tps65910 *tps = dev_get_drvdata(dev->parent);
 	int ret;

 	ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, alarm_data,
 		NUM_TIME_REGS);
 	if (ret < 0) {
 		dev_err(dev, "rtc_read_alarm error %d\n", ret);
 		return ret;
 	}

 	alm->time.tm_sec = bcd2bin(alarm_data[0]);
 	alm->time.tm_min = bcd2bin(alarm_data[1]);
 	alm->time.tm_hour = bcd2bin(alarm_data[2]);
 	alm->time.tm_mday = bcd2bin(alarm_data[3]);
 	alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
 	alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;

 	ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val);
 	if (ret < 0)
 		return ret;

 	if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM)
 		alm->enabled = 1;

 	return ret;
 }

 static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 {
 	unsigned char alarm_data[NUM_TIME_REGS];
 	struct tps65910 *tps = dev_get_drvdata(dev->parent);
 	int ret;

 	ret = tps65910_rtc_alarm_irq_enable(dev, 0);
 	if (ret)
 		return ret;

 	alarm_data[0] = bin2bcd(alm->time.tm_sec);
 	alarm_data[1] = bin2bcd(alm->time.tm_min);
 	alarm_data[2] = bin2bcd(alm->time.tm_hour);
 	alarm_data[3] = bin2bcd(alm->time.tm_mday);
 	alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
 	alarm_data[5] = bin2bcd(alm->time.tm_year - 100);

 	/* update all the alarm registers in one shot */
 	ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS,
 		alarm_data, NUM_TIME_REGS);
 	if (ret) {
 		dev_err(dev, "rtc_set_alarm error %d\n", ret);
 		return ret;
 	}

 	if (alm->enabled)
 		ret = tps65910_rtc_alarm_irq_enable(dev, 1);

 	return ret;
 }

 static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc)
 {
 	struct device *dev = rtc;
 	unsigned long events = 0;
 	struct tps65910 *tps = dev_get_drvdata(dev->parent);
 	struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
 	int ret;
 	u32 rtc_reg;

 	ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg);
 	if (ret)
 		return IRQ_NONE;

 	if (rtc_reg & TPS65910_RTC_STATUS_ALARM)
 		events = RTC_IRQF | RTC_AF;

 	ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg);
 	if (ret)
 		return IRQ_NONE;

 	/* Notify RTC core on event */
 	rtc_update_irq(tps_rtc->rtc, 1, events);

 	return IRQ_HANDLED;
 }

 static const struct rtc_class_ops tps65910_rtc_ops = {
 	.read_time	= tps65910_rtc_read_time,
 	.set_time	= tps65910_rtc_set_time,
 	.read_alarm	= tps65910_rtc_read_alarm,
 	.set_alarm	= tps65910_rtc_set_alarm,
 	.alarm_irq_enable = tps65910_rtc_alarm_irq_enable,
 };

 static int __devinit tps65910_rtc_probe(struct platform_device *pdev)
 {
 	struct tps65910 *tps65910 = NULL;
 	struct tps65910_rtc *tps_rtc = NULL;
 	int ret;
 	int irq;
 	u32 rtc_reg;

 	tps65910 = dev_get_drvdata(pdev->dev.parent);

 	tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc),
 			GFP_KERNEL);
 	if (!tps_rtc)
 		return -ENOMEM;

 	/* Clear pending interrupts */
 	ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
 	if (ret < 0)
 		return ret;

 	ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg);
 	if (ret < 0)
 		return ret;

 	dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");
 	rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
 	ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
 	if (ret < 0)
 		return ret;

 	irq  = platform_get_irq(pdev, 0);
 	if (irq <= 0) {
 		dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
 			irq);
 		return ret;
 	}

 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 		tps65910_rtc_interrupt, IRQF_TRIGGER_LOW,
 		"rtc-tps65910", &pdev->dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "IRQ is not free.\n");
 		return ret;
 	}
 	device_init_wakeup(&pdev->dev, 1);

 	tps_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
 		&tps65910_rtc_ops, THIS_MODULE);
 	if (IS_ERR(tps_rtc->rtc)) {
 		ret = PTR_ERR(tps_rtc->rtc);
 		dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
 		return ret;
 	}

 	platform_set_drvdata(pdev, tps_rtc);

 	return 0;
 }

 /*
  * Disable tps65910 RTC interrupts.
  * Sets status flag to free.
  */
 static int __devexit tps65910_rtc_remove(struct platform_device *pdev)
 {
 	/* leave rtc running, but disable irqs */
 	struct tps65910_rtc *tps_rtc = platform_get_drvdata(pdev);

 	tps65910_rtc_alarm_irq_enable(&pdev->dev, 0);

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

 #ifdef CONFIG_PM_SLEEP

 static int tps65910_rtc_suspend(struct device *dev)
 {
 	struct tps65910 *tps = dev_get_drvdata(dev->parent);
 	u8 alarm = TPS65910_RTC_INTERRUPTS_IT_ALARM;
 	int ret;

 	/* Store current list of enabled interrupts*/
 	ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS,
 		&tps->rtc->irqstat);
 	if (ret < 0)
 		return ret;

 	/* Enable RTC ALARM interrupt only */
 	return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, alarm);
 }

 static int tps65910_rtc_resume(struct device *dev)
 {
 	struct tps65910 *tps = dev_get_drvdata(dev->parent);

 	/* Restore list of enabled interrupts before suspend */
 	return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS,
 		tps->rtc->irqstat);
 }

 static const struct dev_pm_ops tps65910_rtc_pm_ops = {
 	.suspend	= tps65910_rtc_suspend,
 	.resume		= tps65910_rtc_resume,
 };

 #define DEV_PM_OPS     (&tps65910_rtc_pm_ops)
 #else
 #define DEV_PM_OPS     NULL
 #endif

 static struct platform_driver tps65910_rtc_driver = {
 	.probe		= tps65910_rtc_probe,
 	.remove		= __devexit_p(tps65910_rtc_remove),
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= "tps65910-rtc",
 		.pm	= DEV_PM_OPS,
 	},
 };

 module_platform_driver(tps65910_rtc_driver);
 MODULE_ALIAS("platform:rtc-tps65910");
 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
 MODULE_LICENSE("GPL");
	/*
	* rtc-tps65910.c -- TPS65910 Real Time Clock interface
	*
	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	* Author: Venu Byravarasu <vbyravarasu@nvidia.com>
	*
	* Based on original TI driver rtc-twl.c
	* Copyright (C) 2007 MontaVista Software, Inc
	* Author: Alexandre Rusev <source@mvista.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/kernel.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/rtc.h>
	#include <linux/bcd.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/mfd/tps65910.h>

	struct tps65910_rtc {
	struct rtc_device *rtc;
	/* To store the list of enabled interrupts */
	u32 irqstat;
	};

	/* Total number of RTC registers needed to set time*/
	#define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1)

	static int tps65910_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
	{
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	u8 val = 0;

	if (enabled)
	val = TPS65910_RTC_INTERRUPTS_IT_ALARM;

	return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val);
	}

	/*
	* Gets current tps65910 RTC time and date parameters.
	*
	* The RTC's time/alarm representation is not what gmtime(3) requires
	* Linux to use:
	*
	* - Months are 1..12 vs Linux 0-11
	* - Years are 0..99 vs Linux 1900..N (we assume 21st century)
	*/
	static int tps65910_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	unsigned char rtc_data[NUM_TIME_REGS];
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	int ret;

	/* Copy RTC counting registers to static registers or latches */
	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
	TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME);
	if (ret < 0) {
	dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret);
	return ret;
	}

	ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data,
	NUM_TIME_REGS);
	if (ret < 0) {
	dev_err(dev, "reading from RTC failed with err:%d\n", ret);
	return ret;
	}

	tm->tm_sec = bcd2bin(rtc_data[0]);
	tm->tm_min = bcd2bin(rtc_data[1]);
	tm->tm_hour = bcd2bin(rtc_data[2]);
	tm->tm_mday = bcd2bin(rtc_data[3]);
	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
	tm->tm_year = bcd2bin(rtc_data[5]) + 100;

	return ret;
	}

	static int tps65910_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	unsigned char rtc_data[NUM_TIME_REGS];
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	int ret;

	rtc_data[0] = bin2bcd(tm->tm_sec);
	rtc_data[1] = bin2bcd(tm->tm_min);
	rtc_data[2] = bin2bcd(tm->tm_hour);
	rtc_data[3] = bin2bcd(tm->tm_mday);
	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	rtc_data[5] = bin2bcd(tm->tm_year - 100);

	/* Stop RTC while updating the RTC time registers */
	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
	TPS65910_RTC_CTRL_STOP_RTC, 0);
	if (ret < 0) {
	dev_err(dev, "RTC stop failed with err:%d\n", ret);
	return ret;
	}

	/* update all the time registers in one shot */
	ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data,
	NUM_TIME_REGS);
	if (ret < 0) {
	dev_err(dev, "rtc_set_time error %d\n", ret);
	return ret;
	}

	/* Start back RTC */
	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
	TPS65910_RTC_CTRL_STOP_RTC, 1);
	if (ret < 0)
	dev_err(dev, "RTC start failed with err:%d\n", ret);

	return ret;
	}

	/*
	* Gets current tps65910 RTC alarm time.
	*/
	static int tps65910_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	{
	unsigned char alarm_data[NUM_TIME_REGS];
	u32 int_val;
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	int ret;

	ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, alarm_data,
	NUM_TIME_REGS);
	if (ret < 0) {
	dev_err(dev, "rtc_read_alarm error %d\n", ret);
	return ret;
	}

	alm->time.tm_sec = bcd2bin(alarm_data[0]);
	alm->time.tm_min = bcd2bin(alarm_data[1]);
	alm->time.tm_hour = bcd2bin(alarm_data[2]);
	alm->time.tm_mday = bcd2bin(alarm_data[3]);
	alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
	alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;

	ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val);
	if (ret < 0)
	return ret;

	if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM)
	alm->enabled = 1;

	return ret;
	}

	static int tps65910_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	{
	unsigned char alarm_data[NUM_TIME_REGS];
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	int ret;

	ret = tps65910_rtc_alarm_irq_enable(dev, 0);
	if (ret)
	return ret;

	alarm_data[0] = bin2bcd(alm->time.tm_sec);
	alarm_data[1] = bin2bcd(alm->time.tm_min);
	alarm_data[2] = bin2bcd(alm->time.tm_hour);
	alarm_data[3] = bin2bcd(alm->time.tm_mday);
	alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
	alarm_data[5] = bin2bcd(alm->time.tm_year - 100);

	/* update all the alarm registers in one shot */
	ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS,
	alarm_data, NUM_TIME_REGS);
	if (ret) {
	dev_err(dev, "rtc_set_alarm error %d\n", ret);
	return ret;
	}

	if (alm->enabled)
	ret = tps65910_rtc_alarm_irq_enable(dev, 1);

	return ret;
	}

	static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc)
	{
	struct device *dev = rtc;
	unsigned long events = 0;
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
	int ret;
	u32 rtc_reg;

	ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg);
	if (ret)
	return IRQ_NONE;

	if (rtc_reg & TPS65910_RTC_STATUS_ALARM)
	events = RTC_IRQF \| RTC_AF;

	ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg);
	if (ret)
	return IRQ_NONE;

	/* Notify RTC core on event */
	rtc_update_irq(tps_rtc->rtc, 1, events);

	return IRQ_HANDLED;
	}

	static const struct rtc_class_ops tps65910_rtc_ops = {
	.read_time = tps65910_rtc_read_time,
	.set_time = tps65910_rtc_set_time,
	.read_alarm = tps65910_rtc_read_alarm,
	.set_alarm = tps65910_rtc_set_alarm,
	.alarm_irq_enable = tps65910_rtc_alarm_irq_enable,
	};

	static int __devinit tps65910_rtc_probe(struct platform_device *pdev)
	{
	struct tps65910 *tps65910 = NULL;
	struct tps65910_rtc *tps_rtc = NULL;
	int ret;
	int irq;
	u32 rtc_reg;

	tps65910 = dev_get_drvdata(pdev->dev.parent);

	tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc),
	GFP_KERNEL);
	if (!tps_rtc)
	return -ENOMEM;

	/* Clear pending interrupts */
	ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
	if (ret < 0)
	return ret;

	ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg);
	if (ret < 0)
	return ret;

	dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");
	rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
	ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
	if (ret < 0)
	return ret;

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
	dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
	irq);
	return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
	tps65910_rtc_interrupt, IRQF_TRIGGER_LOW,
	"rtc-tps65910", &pdev->dev);
	if (ret < 0) {
	dev_err(&pdev->dev, "IRQ is not free.\n");
	return ret;
	}
	device_init_wakeup(&pdev->dev, 1);

	tps_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
	&tps65910_rtc_ops, THIS_MODULE);
	if (IS_ERR(tps_rtc->rtc)) {
	ret = PTR_ERR(tps_rtc->rtc);
	dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
	return ret;
	}

	platform_set_drvdata(pdev, tps_rtc);

	return 0;
	}

	/*
	* Disable tps65910 RTC interrupts.
	* Sets status flag to free.
	*/
	static int __devexit tps65910_rtc_remove(struct platform_device *pdev)
	{
	/* leave rtc running, but disable irqs */
	struct tps65910_rtc *tps_rtc = platform_get_drvdata(pdev);

	tps65910_rtc_alarm_irq_enable(&pdev->dev, 0);

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

	#ifdef CONFIG_PM_SLEEP

	static int tps65910_rtc_suspend(struct device *dev)
	{
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	u8 alarm = TPS65910_RTC_INTERRUPTS_IT_ALARM;
	int ret;

	/* Store current list of enabled interrupts*/
	ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS,
	&tps->rtc->irqstat);
	if (ret < 0)
	return ret;

	/* Enable RTC ALARM interrupt only */
	return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, alarm);
	}

	static int tps65910_rtc_resume(struct device *dev)
	{
	struct tps65910 *tps = dev_get_drvdata(dev->parent);

	/* Restore list of enabled interrupts before suspend */
	return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS,
	tps->rtc->irqstat);
	}

	static const struct dev_pm_ops tps65910_rtc_pm_ops = {
	.suspend = tps65910_rtc_suspend,
	.resume = tps65910_rtc_resume,
	};

	#define DEV_PM_OPS (&tps65910_rtc_pm_ops)
	#else
	#define DEV_PM_OPS NULL
	#endif

	static struct platform_driver tps65910_rtc_driver = {
	.probe = tps65910_rtc_probe,
	.remove = __devexit_p(tps65910_rtc_remove),
	.driver = {
	.owner = THIS_MODULE,
	.name = "tps65910-rtc",
	.pm = DEV_PM_OPS,
	},
	};

	module_platform_driver(tps65910_rtc_driver);
	MODULE_ALIAS("platform:rtc-tps65910");
	MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
	MODULE_LICENSE("GPL");