drivers/rtc/rtc-pcf50633.c - kernel/common - Git at Google

 /* NXP PCF50633 RTC Driver
  *
  * (C) 2006-2008 by Openmoko, Inc.
  * Author: Balaji Rao <[email protected]>
  * All rights reserved.
  *
  * Broken down from monstrous PCF50633 driver mainly by
  * Harald Welte, Andy Green and Werner Almesberger
  *
  *  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/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/err.h>

 #include <linux/mfd/pcf50633/core.h>

 #define PCF50633_REG_RTCSC	0x59 /* Second */
 #define PCF50633_REG_RTCMN	0x5a /* Minute */
 #define PCF50633_REG_RTCHR	0x5b /* Hour */
 #define PCF50633_REG_RTCWD	0x5c /* Weekday */
 #define PCF50633_REG_RTCDT	0x5d /* Day */
 #define PCF50633_REG_RTCMT	0x5e /* Month */
 #define PCF50633_REG_RTCYR	0x5f /* Year */
 #define PCF50633_REG_RTCSCA	0x60 /* Alarm Second */
 #define PCF50633_REG_RTCMNA	0x61 /* Alarm Minute */
 #define PCF50633_REG_RTCHRA	0x62 /* Alarm Hour */
 #define PCF50633_REG_RTCWDA	0x63 /* Alarm Weekday */
 #define PCF50633_REG_RTCDTA	0x64 /* Alarm Day */
 #define PCF50633_REG_RTCMTA	0x65 /* Alarm Month */
 #define PCF50633_REG_RTCYRA	0x66 /* Alarm Year */

 enum pcf50633_time_indexes {
 	PCF50633_TI_SEC,
 	PCF50633_TI_MIN,
 	PCF50633_TI_HOUR,
 	PCF50633_TI_WKDAY,
 	PCF50633_TI_DAY,
 	PCF50633_TI_MONTH,
 	PCF50633_TI_YEAR,
 	PCF50633_TI_EXTENT /* always last */
 };

 struct pcf50633_time {
 	u_int8_t time[PCF50633_TI_EXTENT];
 };

 struct pcf50633_rtc {
 	int alarm_enabled;
 	int second_enabled;
 	int alarm_pending;

 	struct pcf50633 *pcf;
 	struct rtc_device *rtc_dev;
 };

 static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
 {
 	rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
 	rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
 	rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
 	rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
 	rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
 	rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
 	rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
 }

 static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
 {
 	pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
 	pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
 	pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
 	pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
 	pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
 	pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
 	pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
 }

 static int
 pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
 	int err;

 	if (enabled)
 		err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
 	else
 		err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);

 	if (err < 0)
 		return err;

 	rtc->alarm_enabled = enabled;

 	return 0;
 }

 static int
 pcf50633_rtc_update_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
 	int err;

 	if (enabled)
 		err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
 	else
 		err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);

 	if (err < 0)
 		return err;

 	rtc->second_enabled = enabled;

 	return 0;
 }

 static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct pcf50633_rtc *rtc;
 	struct pcf50633_time pcf_tm;
 	int ret;

 	rtc = dev_get_drvdata(dev);

 	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
 					    PCF50633_TI_EXTENT,
 					    &pcf_tm.time[0]);
 	if (ret != PCF50633_TI_EXTENT) {
 		dev_err(dev, "Failed to read time\n");
 		return -EIO;
 	}

 	dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
 		pcf_tm.time[PCF50633_TI_DAY],
 		pcf_tm.time[PCF50633_TI_MONTH],
 		pcf_tm.time[PCF50633_TI_YEAR],
 		pcf_tm.time[PCF50633_TI_HOUR],
 		pcf_tm.time[PCF50633_TI_MIN],
 		pcf_tm.time[PCF50633_TI_SEC]);

 	pcf2rtc_time(tm, &pcf_tm);

 	dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
 		tm->tm_mday, tm->tm_mon, tm->tm_year,
 		tm->tm_hour, tm->tm_min, tm->tm_sec);

 	return rtc_valid_tm(tm);
 }

 static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct pcf50633_rtc *rtc;
 	struct pcf50633_time pcf_tm;
 	int second_masked, alarm_masked, ret = 0;

 	rtc = dev_get_drvdata(dev);

 	dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
 		tm->tm_mday, tm->tm_mon, tm->tm_year,
 		tm->tm_hour, tm->tm_min, tm->tm_sec);

 	rtc2pcf_time(&pcf_tm, tm);

 	dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
 		pcf_tm.time[PCF50633_TI_DAY],
 		pcf_tm.time[PCF50633_TI_MONTH],
 		pcf_tm.time[PCF50633_TI_YEAR],
 		pcf_tm.time[PCF50633_TI_HOUR],
 		pcf_tm.time[PCF50633_TI_MIN],
 		pcf_tm.time[PCF50633_TI_SEC]);


 	second_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_SECOND);
 	alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);

 	if (!second_masked)
 		pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
 	if (!alarm_masked)
 		pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);

 	/* Returns 0 on success */
 	ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
 					     PCF50633_TI_EXTENT,
 					     &pcf_tm.time[0]);

 	if (!second_masked)
 		pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
 	if (!alarm_masked)
 		pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);

 	return ret;
 }

 static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct pcf50633_rtc *rtc;
 	struct pcf50633_time pcf_tm;
 	int ret = 0;

 	rtc = dev_get_drvdata(dev);

 	alrm->enabled = rtc->alarm_enabled;
 	alrm->pending = rtc->alarm_pending;

 	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
 				PCF50633_TI_EXTENT, &pcf_tm.time[0]);
 	if (ret != PCF50633_TI_EXTENT) {
 		dev_err(dev, "Failed to read time\n");
 		return -EIO;
 	}

 	pcf2rtc_time(&alrm->time, &pcf_tm);

 	return rtc_valid_tm(&alrm->time);
 }

 static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct pcf50633_rtc *rtc;
 	struct pcf50633_time pcf_tm;
 	int alarm_masked, ret = 0;

 	rtc = dev_get_drvdata(dev);

 	rtc2pcf_time(&pcf_tm, &alrm->time);

 	/* do like mktime does and ignore tm_wday */
 	pcf_tm.time[PCF50633_TI_WKDAY] = 7;

 	alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);

 	/* disable alarm interrupt */
 	if (!alarm_masked)
 		pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);

 	/* Returns 0 on success */
 	ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
 				PCF50633_TI_EXTENT, &pcf_tm.time[0]);
 	if (!alrm->enabled)
 		rtc->alarm_pending = 0;

 	if (!alarm_masked || alrm->enabled)
 		pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
 	rtc->alarm_enabled = alrm->enabled;

 	return ret;
 }

 static struct rtc_class_ops pcf50633_rtc_ops = {
 	.read_time		= pcf50633_rtc_read_time,
 	.set_time		= pcf50633_rtc_set_time,
 	.read_alarm		= pcf50633_rtc_read_alarm,
 	.set_alarm		= pcf50633_rtc_set_alarm,
 	.alarm_irq_enable 	= pcf50633_rtc_alarm_irq_enable,
 	.update_irq_enable 	= pcf50633_rtc_update_irq_enable,
 };

 static void pcf50633_rtc_irq(int irq, void *data)
 {
 	struct pcf50633_rtc *rtc = data;

 	switch (irq) {
 	case PCF50633_IRQ_ALARM:
 		rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 		rtc->alarm_pending = 1;
 		break;
 	case PCF50633_IRQ_SECOND:
 		rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
 		break;
 	}
 }

 static int __devinit pcf50633_rtc_probe(struct platform_device *pdev)
 {
 	struct pcf50633_rtc *rtc;

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

 	rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
 	platform_set_drvdata(pdev, rtc);
 	rtc->rtc_dev = rtc_device_register("pcf50633-rtc", &pdev->dev,
 				&pcf50633_rtc_ops, THIS_MODULE);

 	if (IS_ERR(rtc->rtc_dev)) {
 		int ret =  PTR_ERR(rtc->rtc_dev);
 		kfree(rtc);
 		return ret;
 	}

 	pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
 					pcf50633_rtc_irq, rtc);
 	pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_SECOND,
 					pcf50633_rtc_irq, rtc);

 	return 0;
 }

 static int __devexit pcf50633_rtc_remove(struct platform_device *pdev)
 {
 	struct pcf50633_rtc *rtc;

 	rtc = platform_get_drvdata(pdev);

 	pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
 	pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_SECOND);

 	rtc_device_unregister(rtc->rtc_dev);
 	kfree(rtc);

 	return 0;
 }

 static struct platform_driver pcf50633_rtc_driver = {
 	.driver = {
 		.name = "pcf50633-rtc",
 	},
 	.probe = pcf50633_rtc_probe,
 	.remove = __devexit_p(pcf50633_rtc_remove),
 };

 static int __init pcf50633_rtc_init(void)
 {
 	return platform_driver_register(&pcf50633_rtc_driver);
 }
 module_init(pcf50633_rtc_init);

 static void __exit pcf50633_rtc_exit(void)
 {
 	platform_driver_unregister(&pcf50633_rtc_driver);
 }
 module_exit(pcf50633_rtc_exit);

 MODULE_DESCRIPTION("PCF50633 RTC driver");
 MODULE_AUTHOR("Balaji Rao <[email protected]>");
 MODULE_LICENSE("GPL");
	/* NXP PCF50633 RTC Driver
	*
	* (C) 2006-2008 by Openmoko, Inc.
	* Author: Balaji Rao <[email protected]>
	* All rights reserved.
	*
	* Broken down from monstrous PCF50633 driver mainly by
	* Harald Welte, Andy Green and Werner Almesberger
	*
	* 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/module.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/rtc.h>
	#include <linux/bcd.h>
	#include <linux/err.h>

	#include <linux/mfd/pcf50633/core.h>

	#define PCF50633_REG_RTCSC 0x59 /* Second */
	#define PCF50633_REG_RTCMN 0x5a /* Minute */
	#define PCF50633_REG_RTCHR 0x5b /* Hour */
	#define PCF50633_REG_RTCWD 0x5c /* Weekday */
	#define PCF50633_REG_RTCDT 0x5d /* Day */
	#define PCF50633_REG_RTCMT 0x5e /* Month */
	#define PCF50633_REG_RTCYR 0x5f /* Year */
	#define PCF50633_REG_RTCSCA 0x60 /* Alarm Second */
	#define PCF50633_REG_RTCMNA 0x61 /* Alarm Minute */
	#define PCF50633_REG_RTCHRA 0x62 /* Alarm Hour */
	#define PCF50633_REG_RTCWDA 0x63 /* Alarm Weekday */
	#define PCF50633_REG_RTCDTA 0x64 /* Alarm Day */
	#define PCF50633_REG_RTCMTA 0x65 /* Alarm Month */
	#define PCF50633_REG_RTCYRA 0x66 /* Alarm Year */

	enum pcf50633_time_indexes {
	PCF50633_TI_SEC,
	PCF50633_TI_MIN,
	PCF50633_TI_HOUR,
	PCF50633_TI_WKDAY,
	PCF50633_TI_DAY,
	PCF50633_TI_MONTH,
	PCF50633_TI_YEAR,
	PCF50633_TI_EXTENT /* always last */
	};

	struct pcf50633_time {
	u_int8_t time[PCF50633_TI_EXTENT];
	};

	struct pcf50633_rtc {
	int alarm_enabled;
	int second_enabled;
	int alarm_pending;

	struct pcf50633 *pcf;
	struct rtc_device *rtc_dev;
	};

	static void pcf2rtc_time(struct rtc_time rtc, struct pcf50633_time pcf)
	{
	rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
	rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
	rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
	rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
	rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
	rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
	rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
	}

	static void rtc2pcf_time(struct pcf50633_time pcf, struct rtc_time rtc)
	{
	pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
	pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
	pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
	pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
	pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
	pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
	pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
	}

	static int
	pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	{
	struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
	int err;

	if (enabled)
	err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
	else
	err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);

	if (err < 0)
	return err;

	rtc->alarm_enabled = enabled;

	return 0;
	}

	static int
	pcf50633_rtc_update_irq_enable(struct device *dev, unsigned int enabled)
	{
	struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
	int err;

	if (enabled)
	err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
	else
	err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);

	if (err < 0)
	return err;

	rtc->second_enabled = enabled;

	return 0;
	}

	static int pcf50633_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	struct pcf50633_rtc *rtc;
	struct pcf50633_time pcf_tm;
	int ret;

	rtc = dev_get_drvdata(dev);

	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
	PCF50633_TI_EXTENT,
	&pcf_tm.time[0]);
	if (ret != PCF50633_TI_EXTENT) {
	dev_err(dev, "Failed to read time\n");
	return -EIO;
	}

	dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
	pcf_tm.time[PCF50633_TI_DAY],
	pcf_tm.time[PCF50633_TI_MONTH],
	pcf_tm.time[PCF50633_TI_YEAR],
	pcf_tm.time[PCF50633_TI_HOUR],
	pcf_tm.time[PCF50633_TI_MIN],
	pcf_tm.time[PCF50633_TI_SEC]);

	pcf2rtc_time(tm, &pcf_tm);

	dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
	tm->tm_mday, tm->tm_mon, tm->tm_year,
	tm->tm_hour, tm->tm_min, tm->tm_sec);

	return rtc_valid_tm(tm);
	}

	static int pcf50633_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	struct pcf50633_rtc *rtc;
	struct pcf50633_time pcf_tm;
	int second_masked, alarm_masked, ret = 0;

	rtc = dev_get_drvdata(dev);

	dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
	tm->tm_mday, tm->tm_mon, tm->tm_year,
	tm->tm_hour, tm->tm_min, tm->tm_sec);

	rtc2pcf_time(&pcf_tm, tm);

	dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
	pcf_tm.time[PCF50633_TI_DAY],
	pcf_tm.time[PCF50633_TI_MONTH],
	pcf_tm.time[PCF50633_TI_YEAR],
	pcf_tm.time[PCF50633_TI_HOUR],
	pcf_tm.time[PCF50633_TI_MIN],
	pcf_tm.time[PCF50633_TI_SEC]);


	second_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_SECOND);
	alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);

	if (!second_masked)
	pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
	if (!alarm_masked)
	pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);

	/* Returns 0 on success */
	ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
	PCF50633_TI_EXTENT,
	&pcf_tm.time[0]);

	if (!second_masked)
	pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
	if (!alarm_masked)
	pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);

	return ret;
	}

	static int pcf50633_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct pcf50633_rtc *rtc;
	struct pcf50633_time pcf_tm;
	int ret = 0;

	rtc = dev_get_drvdata(dev);

	alrm->enabled = rtc->alarm_enabled;
	alrm->pending = rtc->alarm_pending;

	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
	PCF50633_TI_EXTENT, &pcf_tm.time[0]);
	if (ret != PCF50633_TI_EXTENT) {
	dev_err(dev, "Failed to read time\n");
	return -EIO;
	}

	pcf2rtc_time(&alrm->time, &pcf_tm);

	return rtc_valid_tm(&alrm->time);
	}

	static int pcf50633_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct pcf50633_rtc *rtc;
	struct pcf50633_time pcf_tm;
	int alarm_masked, ret = 0;

	rtc = dev_get_drvdata(dev);

	rtc2pcf_time(&pcf_tm, &alrm->time);

	/* do like mktime does and ignore tm_wday */
	pcf_tm.time[PCF50633_TI_WKDAY] = 7;

	alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);

	/* disable alarm interrupt */
	if (!alarm_masked)
	pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);

	/* Returns 0 on success */
	ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
	PCF50633_TI_EXTENT, &pcf_tm.time[0]);
	if (!alrm->enabled)
	rtc->alarm_pending = 0;

	if (!alarm_masked \|\| alrm->enabled)
	pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
	rtc->alarm_enabled = alrm->enabled;

	return ret;
	}

	static struct rtc_class_ops pcf50633_rtc_ops = {
	.read_time = pcf50633_rtc_read_time,
	.set_time = pcf50633_rtc_set_time,
	.read_alarm = pcf50633_rtc_read_alarm,
	.set_alarm = pcf50633_rtc_set_alarm,
	.alarm_irq_enable = pcf50633_rtc_alarm_irq_enable,
	.update_irq_enable = pcf50633_rtc_update_irq_enable,
	};

	static void pcf50633_rtc_irq(int irq, void *data)
	{
	struct pcf50633_rtc *rtc = data;

	switch (irq) {
	case PCF50633_IRQ_ALARM:
	rtc_update_irq(rtc->rtc_dev, 1, RTC_AF \| RTC_IRQF);
	rtc->alarm_pending = 1;
	break;
	case PCF50633_IRQ_SECOND:
	rtc_update_irq(rtc->rtc_dev, 1, RTC_UF \| RTC_IRQF);
	break;
	}
	}

	static int __devinit pcf50633_rtc_probe(struct platform_device *pdev)
	{
	struct pcf50633_rtc *rtc;

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

	rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
	platform_set_drvdata(pdev, rtc);
	rtc->rtc_dev = rtc_device_register("pcf50633-rtc", &pdev->dev,
	&pcf50633_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc->rtc_dev)) {
	int ret = PTR_ERR(rtc->rtc_dev);
	kfree(rtc);
	return ret;
	}

	pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
	pcf50633_rtc_irq, rtc);
	pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_SECOND,
	pcf50633_rtc_irq, rtc);

	return 0;
	}

	static int __devexit pcf50633_rtc_remove(struct platform_device *pdev)
	{
	struct pcf50633_rtc *rtc;

	rtc = platform_get_drvdata(pdev);

	pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
	pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_SECOND);

	rtc_device_unregister(rtc->rtc_dev);
	kfree(rtc);

	return 0;
	}

	static struct platform_driver pcf50633_rtc_driver = {
	.driver = {
	.name = "pcf50633-rtc",
	},
	.probe = pcf50633_rtc_probe,
	.remove = __devexit_p(pcf50633_rtc_remove),
	};

	static int __init pcf50633_rtc_init(void)
	{
	return platform_driver_register(&pcf50633_rtc_driver);
	}
	module_init(pcf50633_rtc_init);

	static void __exit pcf50633_rtc_exit(void)
	{
	platform_driver_unregister(&pcf50633_rtc_driver);
	}
	module_exit(pcf50633_rtc_exit);

	MODULE_DESCRIPTION("PCF50633 RTC driver");
	MODULE_AUTHOR("Balaji Rao <[email protected]>");
	MODULE_LICENSE("GPL");