drivers/rtc/rtc-mc13xxx.c - maze/linux - Git at Google

 /*
  * Real Time Clock driver for Freescale MC13XXX PMIC
  *
  * (C) 2009 Sascha Hauer, Pengutronix
  * (C) 2009 Uwe Kleine-Koenig, Pengutronix
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/mfd/mc13xxx.h>
 #include <linux/platform_device.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/rtc.h>

 #define DRIVER_NAME "mc13xxx-rtc"

 #define MC13XXX_RTCTOD	20
 #define MC13XXX_RTCTODA	21
 #define MC13XXX_RTCDAY	22
 #define MC13XXX_RTCDAYA	23

 struct mc13xxx_rtc {
 	struct rtc_device *rtc;
 	struct mc13xxx *mc13xxx;
 	int valid;
 };

 static int mc13xxx_rtc_irq_enable_unlocked(struct device *dev,
 		unsigned int enabled, int irq)
 {
 	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
 	int (*func)(struct mc13xxx *mc13xxx, int irq);

 	if (!priv->valid)
 		return -ENODATA;

 	func = enabled ? mc13xxx_irq_unmask : mc13xxx_irq_mask;
 	return func(priv->mc13xxx, irq);
 }

 static int mc13xxx_rtc_irq_enable(struct device *dev,
 		unsigned int enabled, int irq)
 {
 	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
 	int ret;

 	mc13xxx_lock(priv->mc13xxx);

 	ret = mc13xxx_rtc_irq_enable_unlocked(dev, enabled, irq);

 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static int mc13xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
 	unsigned int seconds, days1, days2;
 	unsigned long s1970;
 	int ret;

 	mc13xxx_lock(priv->mc13xxx);

 	if (!priv->valid) {
 		ret = -ENODATA;
 		goto out;
 	}

 	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1);
 	if (unlikely(ret))
 		goto out;

 	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTOD, &seconds);
 	if (unlikely(ret))
 		goto out;

 	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days2);
 out:
 	mc13xxx_unlock(priv->mc13xxx);

 	if (ret)
 		return ret;

 	if (days2 == days1 + 1) {
 		if (seconds >= 86400 / 2)
 			days2 = days1;
 		else
 			days1 = days2;
 	}

 	if (days1 != days2)
 		return -EIO;

 	s1970 = days1 * 86400 + seconds;

 	rtc_time_to_tm(s1970, tm);

 	return rtc_valid_tm(tm);
 }

 static int mc13xxx_rtc_set_mmss(struct device *dev, unsigned long secs)
 {
 	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
 	unsigned int seconds, days;
 	unsigned int alarmseconds;
 	int ret;

 	seconds = secs % 86400;
 	days = secs / 86400;

 	mc13xxx_lock(priv->mc13xxx);

 	/*
 	 * temporarily invalidate alarm to prevent triggering it when the day is
 	 * already updated while the time isn't yet.
 	 */
 	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &alarmseconds);
 	if (unlikely(ret))
 		goto out;

 	if (alarmseconds < 86400) {
 		ret = mc13xxx_reg_write(priv->mc13xxx,
 				MC13XXX_RTCTODA, 0x1ffff);
 		if (unlikely(ret))
 			goto out;
 	}

 	/*
 	 * write seconds=0 to prevent a day switch between writing days
 	 * and seconds below
 	 */
 	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, 0);
 	if (unlikely(ret))
 		goto out;

 	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAY, days);
 	if (unlikely(ret))
 		goto out;

 	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, seconds);
 	if (unlikely(ret))
 		goto out;

 	/* restore alarm */
 	if (alarmseconds < 86400) {
 		ret = mc13xxx_reg_write(priv->mc13xxx,
 				MC13XXX_RTCTODA, alarmseconds);
 		if (unlikely(ret))
 			goto out;
 	}

 	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
 	if (unlikely(ret))
 		goto out;

 	ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
 out:
 	priv->valid = !ret;

 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static int mc13xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 {
 	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
 	unsigned seconds, days;
 	unsigned long s1970;
 	int enabled, pending;
 	int ret;

 	mc13xxx_lock(priv->mc13xxx);

 	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &seconds);
 	if (unlikely(ret))
 		goto out;
 	if (seconds >= 86400) {
 		ret = -ENODATA;
 		goto out;
 	}

 	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days);
 	if (unlikely(ret))
 		goto out;

 	ret = mc13xxx_irq_status(priv->mc13xxx, MC13XXX_IRQ_TODA,
 			&enabled, &pending);

 out:
 	mc13xxx_unlock(priv->mc13xxx);

 	if (ret)
 		return ret;

 	alarm->enabled = enabled;
 	alarm->pending = pending;

 	s1970 = days * 86400 + seconds;

 	rtc_time_to_tm(s1970, &alarm->time);
 	dev_dbg(dev, "%s: %lu\n", __func__, s1970);

 	return 0;
 }

 static int mc13xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 {
 	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
 	unsigned long s1970;
 	unsigned seconds, days;
 	int ret;

 	mc13xxx_lock(priv->mc13xxx);

 	/* disable alarm to prevent false triggering */
 	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, 0x1ffff);
 	if (unlikely(ret))
 		goto out;

 	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA);
 	if (unlikely(ret))
 		goto out;

 	ret = rtc_tm_to_time(&alarm->time, &s1970);
 	if (unlikely(ret))
 		goto out;

 	dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff",
 			s1970);

 	ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled,
 			MC13XXX_IRQ_TODA);
 	if (unlikely(ret))
 		goto out;

 	seconds = s1970 % 86400;
 	days = s1970 / 86400;

 	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAYA, days);
 	if (unlikely(ret))
 		goto out;

 	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, seconds);

 out:
 	mc13xxx_unlock(priv->mc13xxx);

 	return ret;
 }

 static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
 {
 	struct mc13xxx_rtc *priv = dev;
 	struct mc13xxx *mc13xxx = priv->mc13xxx;

 	dev_dbg(&priv->rtc->dev, "Alarm\n");

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

 	mc13xxx_irq_ack(mc13xxx, irq);

 	return IRQ_HANDLED;
 }

 static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev)
 {
 	struct mc13xxx_rtc *priv = dev;
 	struct mc13xxx *mc13xxx = priv->mc13xxx;

 	dev_dbg(&priv->rtc->dev, "1HZ\n");

 	rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);

 	mc13xxx_irq_ack(mc13xxx, irq);

 	return IRQ_HANDLED;
 }

 static int mc13xxx_rtc_update_irq_enable(struct device *dev,
 		unsigned int enabled)
 {
 	return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_1HZ);
 }

 static int mc13xxx_rtc_alarm_irq_enable(struct device *dev,
 		unsigned int enabled)
 {
 	return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_TODA);
 }

 static const struct rtc_class_ops mc13xxx_rtc_ops = {
 	.read_time = mc13xxx_rtc_read_time,
 	.set_mmss = mc13xxx_rtc_set_mmss,
 	.read_alarm = mc13xxx_rtc_read_alarm,
 	.set_alarm = mc13xxx_rtc_set_alarm,
 	.alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable,
 	.update_irq_enable = mc13xxx_rtc_update_irq_enable,
 };

 static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev)
 {
 	struct mc13xxx_rtc *priv = dev;
 	struct mc13xxx *mc13xxx = priv->mc13xxx;

 	dev_dbg(&priv->rtc->dev, "RTCRST\n");
 	priv->valid = 0;

 	mc13xxx_irq_mask(mc13xxx, irq);

 	return IRQ_HANDLED;
 }

 static int __devinit mc13xxx_rtc_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct mc13xxx_rtc *priv;
 	struct mc13xxx *mc13xxx;
 	int rtcrst_pending;

 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	mc13xxx = dev_get_drvdata(pdev->dev.parent);
 	priv->mc13xxx = mc13xxx;

 	platform_set_drvdata(pdev, priv);

 	mc13xxx_lock(mc13xxx);

 	ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
 			mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);
 	if (ret)
 		goto err_reset_irq_request;

 	ret = mc13xxx_irq_status(mc13xxx, MC13XXX_IRQ_RTCRST,
 			NULL, &rtcrst_pending);
 	if (ret)
 		goto err_reset_irq_status;

 	priv->valid = !rtcrst_pending;

 	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_1HZ,
 			mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
 	if (ret)
 		goto err_update_irq_request;

 	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA,
 			mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv);
 	if (ret)
 		goto err_alarm_irq_request;

 	priv->rtc = rtc_device_register(pdev->name,
 			&pdev->dev, &mc13xxx_rtc_ops, THIS_MODULE);
 	if (IS_ERR(priv->rtc)) {
 		ret = PTR_ERR(priv->rtc);

 		mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
 err_alarm_irq_request:

 		mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
 err_update_irq_request:

 err_reset_irq_status:

 		mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
 err_reset_irq_request:

 		platform_set_drvdata(pdev, NULL);
 		kfree(priv);
 	}

 	mc13xxx_unlock(mc13xxx);

 	return ret;
 }

 static int __devexit mc13xxx_rtc_remove(struct platform_device *pdev)
 {
 	struct mc13xxx_rtc *priv = platform_get_drvdata(pdev);

 	mc13xxx_lock(priv->mc13xxx);

 	rtc_device_unregister(priv->rtc);

 	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv);
 	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv);
 	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv);

 	mc13xxx_unlock(priv->mc13xxx);

 	platform_set_drvdata(pdev, NULL);

 	kfree(priv);

 	return 0;
 }

 const struct platform_device_id mc13xxx_rtc_idtable[] = {
 	{
 		.name = "mc13783-rtc",
 	}, {
 		.name = "mc13892-rtc",
 	},
 };

 static struct platform_driver mc13xxx_rtc_driver = {
 	.id_table = mc13xxx_rtc_idtable,
 	.remove = __devexit_p(mc13xxx_rtc_remove),
 	.driver = {
 		.name = DRIVER_NAME,
 		.owner = THIS_MODULE,
 	},
 };

 static int __init mc13xxx_rtc_init(void)
 {
 	return platform_driver_probe(&mc13xxx_rtc_driver, &mc13xxx_rtc_probe);
 }
 module_init(mc13xxx_rtc_init);

 static void __exit mc13xxx_rtc_exit(void)
 {
 	platform_driver_unregister(&mc13xxx_rtc_driver);
 }
 module_exit(mc13xxx_rtc_exit);

 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:" DRIVER_NAME);
	/*
	* Real Time Clock driver for Freescale MC13XXX PMIC
	*
	* (C) 2009 Sascha Hauer, Pengutronix
	* (C) 2009 Uwe Kleine-Koenig, Pengutronix
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/mfd/mc13xxx.h>
	#include <linux/platform_device.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/rtc.h>

	#define DRIVER_NAME "mc13xxx-rtc"

	#define MC13XXX_RTCTOD 20
	#define MC13XXX_RTCTODA 21
	#define MC13XXX_RTCDAY 22
	#define MC13XXX_RTCDAYA 23

	struct mc13xxx_rtc {
	struct rtc_device *rtc;
	struct mc13xxx *mc13xxx;
	int valid;
	};

	static int mc13xxx_rtc_irq_enable_unlocked(struct device *dev,
	unsigned int enabled, int irq)
	{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	int (func)(struct mc13xxx mc13xxx, int irq);

	if (!priv->valid)
	return -ENODATA;

	func = enabled ? mc13xxx_irq_unmask : mc13xxx_irq_mask;
	return func(priv->mc13xxx, irq);
	}

	static int mc13xxx_rtc_irq_enable(struct device *dev,
	unsigned int enabled, int irq)
	{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	int ret;

	mc13xxx_lock(priv->mc13xxx);

	ret = mc13xxx_rtc_irq_enable_unlocked(dev, enabled, irq);

	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static int mc13xxx_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	unsigned int seconds, days1, days2;
	unsigned long s1970;
	int ret;

	mc13xxx_lock(priv->mc13xxx);

	if (!priv->valid) {
	ret = -ENODATA;
	goto out;
	}

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1);
	if (unlikely(ret))
	goto out;

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTOD, &seconds);
	if (unlikely(ret))
	goto out;

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days2);
	out:
	mc13xxx_unlock(priv->mc13xxx);

	if (ret)
	return ret;

	if (days2 == days1 + 1) {
	if (seconds >= 86400 / 2)
	days2 = days1;
	else
	days1 = days2;
	}

	if (days1 != days2)
	return -EIO;

	s1970 = days1 * 86400 + seconds;

	rtc_time_to_tm(s1970, tm);

	return rtc_valid_tm(tm);
	}

	static int mc13xxx_rtc_set_mmss(struct device *dev, unsigned long secs)
	{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	unsigned int seconds, days;
	unsigned int alarmseconds;
	int ret;

	seconds = secs % 86400;
	days = secs / 86400;

	mc13xxx_lock(priv->mc13xxx);

	/*
	* temporarily invalidate alarm to prevent triggering it when the day is
	* already updated while the time isn't yet.
	*/
	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &alarmseconds);
	if (unlikely(ret))
	goto out;

	if (alarmseconds < 86400) {
	ret = mc13xxx_reg_write(priv->mc13xxx,
	MC13XXX_RTCTODA, 0x1ffff);
	if (unlikely(ret))
	goto out;
	}

	/*
	* write seconds=0 to prevent a day switch between writing days
	* and seconds below
	*/
	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, 0);
	if (unlikely(ret))
	goto out;

	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAY, days);
	if (unlikely(ret))
	goto out;

	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, seconds);
	if (unlikely(ret))
	goto out;

	/* restore alarm */
	if (alarmseconds < 86400) {
	ret = mc13xxx_reg_write(priv->mc13xxx,
	MC13XXX_RTCTODA, alarmseconds);
	if (unlikely(ret))
	goto out;
	}

	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
	if (unlikely(ret))
	goto out;

	ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
	out:
	priv->valid = !ret;

	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static int mc13xxx_rtc_read_alarm(struct device dev, struct rtc_wkalrm alarm)
	{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	unsigned seconds, days;
	unsigned long s1970;
	int enabled, pending;
	int ret;

	mc13xxx_lock(priv->mc13xxx);

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &seconds);
	if (unlikely(ret))
	goto out;
	if (seconds >= 86400) {
	ret = -ENODATA;
	goto out;
	}

	ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days);
	if (unlikely(ret))
	goto out;

	ret = mc13xxx_irq_status(priv->mc13xxx, MC13XXX_IRQ_TODA,
	&enabled, &pending);

	out:
	mc13xxx_unlock(priv->mc13xxx);

	if (ret)
	return ret;

	alarm->enabled = enabled;
	alarm->pending = pending;

	s1970 = days * 86400 + seconds;

	rtc_time_to_tm(s1970, &alarm->time);
	dev_dbg(dev, "%s: %lu\n", __func__, s1970);

	return 0;
	}

	static int mc13xxx_rtc_set_alarm(struct device dev, struct rtc_wkalrm alarm)
	{
	struct mc13xxx_rtc *priv = dev_get_drvdata(dev);
	unsigned long s1970;
	unsigned seconds, days;
	int ret;

	mc13xxx_lock(priv->mc13xxx);

	/* disable alarm to prevent false triggering */
	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, 0x1ffff);
	if (unlikely(ret))
	goto out;

	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA);
	if (unlikely(ret))
	goto out;

	ret = rtc_tm_to_time(&alarm->time, &s1970);
	if (unlikely(ret))
	goto out;

	dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff",
	s1970);

	ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled,
	MC13XXX_IRQ_TODA);
	if (unlikely(ret))
	goto out;

	seconds = s1970 % 86400;
	days = s1970 / 86400;

	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAYA, days);
	if (unlikely(ret))
	goto out;

	ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, seconds);

	out:
	mc13xxx_unlock(priv->mc13xxx);

	return ret;
	}

	static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
	{
	struct mc13xxx_rtc *priv = dev;
	struct mc13xxx *mc13xxx = priv->mc13xxx;

	dev_dbg(&priv->rtc->dev, "Alarm\n");

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

	mc13xxx_irq_ack(mc13xxx, irq);

	return IRQ_HANDLED;
	}

	static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev)
	{
	struct mc13xxx_rtc *priv = dev;
	struct mc13xxx *mc13xxx = priv->mc13xxx;

	dev_dbg(&priv->rtc->dev, "1HZ\n");

	rtc_update_irq(priv->rtc, 1, RTC_IRQF \| RTC_UF);

	mc13xxx_irq_ack(mc13xxx, irq);

	return IRQ_HANDLED;
	}

	static int mc13xxx_rtc_update_irq_enable(struct device *dev,
	unsigned int enabled)
	{
	return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_1HZ);
	}

	static int mc13xxx_rtc_alarm_irq_enable(struct device *dev,
	unsigned int enabled)
	{
	return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_TODA);
	}

	static const struct rtc_class_ops mc13xxx_rtc_ops = {
	.read_time = mc13xxx_rtc_read_time,
	.set_mmss = mc13xxx_rtc_set_mmss,
	.read_alarm = mc13xxx_rtc_read_alarm,
	.set_alarm = mc13xxx_rtc_set_alarm,
	.alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable,
	.update_irq_enable = mc13xxx_rtc_update_irq_enable,
	};

	static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev)
	{
	struct mc13xxx_rtc *priv = dev;
	struct mc13xxx *mc13xxx = priv->mc13xxx;

	dev_dbg(&priv->rtc->dev, "RTCRST\n");
	priv->valid = 0;

	mc13xxx_irq_mask(mc13xxx, irq);

	return IRQ_HANDLED;
	}

	static int __devinit mc13xxx_rtc_probe(struct platform_device *pdev)
	{
	int ret;
	struct mc13xxx_rtc *priv;
	struct mc13xxx *mc13xxx;
	int rtcrst_pending;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	mc13xxx = dev_get_drvdata(pdev->dev.parent);
	priv->mc13xxx = mc13xxx;

	platform_set_drvdata(pdev, priv);

	mc13xxx_lock(mc13xxx);

	ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
	mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);
	if (ret)
	goto err_reset_irq_request;

	ret = mc13xxx_irq_status(mc13xxx, MC13XXX_IRQ_RTCRST,
	NULL, &rtcrst_pending);
	if (ret)
	goto err_reset_irq_status;

	priv->valid = !rtcrst_pending;

	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_1HZ,
	mc13xxx_rtc_update_handler, DRIVER_NAME, priv);
	if (ret)
	goto err_update_irq_request;

	ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA,
	mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv);
	if (ret)
	goto err_alarm_irq_request;

	priv->rtc = rtc_device_register(pdev->name,
	&pdev->dev, &mc13xxx_rtc_ops, THIS_MODULE);
	if (IS_ERR(priv->rtc)) {
	ret = PTR_ERR(priv->rtc);

	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
	err_alarm_irq_request:

	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv);
	err_update_irq_request:

	err_reset_irq_status:

	mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
	err_reset_irq_request:

	platform_set_drvdata(pdev, NULL);
	kfree(priv);
	}

	mc13xxx_unlock(mc13xxx);

	return ret;
	}

	static int __devexit mc13xxx_rtc_remove(struct platform_device *pdev)
	{
	struct mc13xxx_rtc *priv = platform_get_drvdata(pdev);

	mc13xxx_lock(priv->mc13xxx);

	rtc_device_unregister(priv->rtc);

	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv);
	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv);
	mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv);

	mc13xxx_unlock(priv->mc13xxx);

	platform_set_drvdata(pdev, NULL);

	kfree(priv);

	return 0;
	}

	const struct platform_device_id mc13xxx_rtc_idtable[] = {
	{
	.name = "mc13783-rtc",
	}, {
	.name = "mc13892-rtc",
	},
	};

	static struct platform_driver mc13xxx_rtc_driver = {
	.id_table = mc13xxx_rtc_idtable,
	.remove = __devexit_p(mc13xxx_rtc_remove),
	.driver = {
	.name = DRIVER_NAME,
	.owner = THIS_MODULE,
	},
	};

	static int __init mc13xxx_rtc_init(void)
	{
	return platform_driver_probe(&mc13xxx_rtc_driver, &mc13xxx_rtc_probe);
	}
	module_init(mc13xxx_rtc_init);

	static void __exit mc13xxx_rtc_exit(void)
	{
	platform_driver_unregister(&mc13xxx_rtc_driver);
	}
	module_exit(mc13xxx_rtc_exit);

	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
	MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:" DRIVER_NAME);