/*
   * Copyright (c) 2013 Samsung Electronics Co., Ltd
   *	http://www.samsung.com
   *
   *  Copyright (C) 2013 Google, Inc
   *
   *  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.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   */
  
  #include <linux/module.h>
  #include <linux/i2c.h>
  #include <linux/slab.h>
  #include <linux/bcd.h>
  #include <linux/bitops.h>
  #include <linux/regmap.h>
  #include <linux/rtc.h>
  #include <linux/delay.h>
  #include <linux/platform_device.h>
  #include <linux/mfd/samsung/core.h>
  #include <linux/mfd/samsung/irq.h>
  #include <linux/mfd/samsung/rtc.h>
  
  /*
   * Maximum number of retries for checking changes in UDR field
   * of SEC_RTC_UDR_CON register (to limit possible endless loop).
   *
   * After writing to RTC registers (setting time or alarm) read the UDR field
   * in SEC_RTC_UDR_CON register. UDR is auto-cleared when data have
   * been transferred.
   */
  #define UDR_READ_RETRY_CNT	5
  
  struct s5m_rtc_info {
  	struct device *dev;
  	struct sec_pmic_dev *s5m87xx;
  	struct regmap *regmap;
  	struct rtc_device *rtc_dev;
  	int irq;
  	int device_type;
  	int rtc_24hr_mode;
  	bool wtsr_smpl;
  };
  
  static void s5m8767_data_to_tm(u8 *data, struct rtc_time *tm,
  			       int rtc_24hr_mode)
  {
  	tm->tm_sec = data[RTC_SEC] & 0x7f;
  	tm->tm_min = data[RTC_MIN] & 0x7f;
  	if (rtc_24hr_mode) {
  		tm->tm_hour = data[RTC_HOUR] & 0x1f;
  	} else {
  		tm->tm_hour = data[RTC_HOUR] & 0x0f;
  		if (data[RTC_HOUR] & HOUR_PM_MASK)
  			tm->tm_hour += 12;
  	}
  
  	tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f);
  	tm->tm_mday = data[RTC_DATE] & 0x1f;
  	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
  	tm->tm_year = (data[RTC_YEAR1] & 0x7f) + 100;
  	tm->tm_yday = 0;
  	tm->tm_isdst = 0;
  }
  
  static int s5m8767_tm_to_data(struct rtc_time *tm, u8 *data)
  {
  	data[RTC_SEC] = tm->tm_sec;
  	data[RTC_MIN] = tm->tm_min;
  
  	if (tm->tm_hour >= 12)
  		data[RTC_HOUR] = tm->tm_hour | HOUR_PM_MASK;
  	else
  		data[RTC_HOUR] = tm->tm_hour & ~HOUR_PM_MASK;
  
  	data[RTC_WEEKDAY] = 1 << tm->tm_wday;
  	data[RTC_DATE] = tm->tm_mday;
  	data[RTC_MONTH] = tm->tm_mon + 1;
  	data[RTC_YEAR1] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
  
  	if (tm->tm_year < 100) {
  		pr_err("s5m8767 RTC cannot handle the year %d.
  ",
  		       1900 + tm->tm_year);
  		return -EINVAL;
  	} else {
  		return 0;
  	}
  }
  
  /*
   * Read RTC_UDR_CON register and wait till UDR field is cleared.
   * This indicates that time/alarm update ended.
   */
  static inline int s5m8767_wait_for_udr_update(struct s5m_rtc_info *info)
  {
  	int ret, retry = UDR_READ_RETRY_CNT;
  	unsigned int data;
  
  	do {
  		ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
  	} while (--retry && (data & RTC_UDR_MASK) && !ret);
  
  	if (!retry)
  		dev_err(info->dev, "waiting for UDR update, reached max number of retries
  ");
  
  	return ret;
  }
  
  static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
  {
  	int ret;
  	unsigned int data;
  
  	ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
  	if (ret < 0) {
  		dev_err(info->dev, "failed to read update reg(%d)
  ", ret);
  		return ret;
  	}
  
  	data |= RTC_TIME_EN_MASK;
  	data |= RTC_UDR_MASK;
  
  	ret = regmap_write(info->regmap, SEC_RTC_UDR_CON, data);
  	if (ret < 0) {
  		dev_err(info->dev, "failed to write update reg(%d)
  ", ret);
  		return ret;
  	}
  
  	ret = s5m8767_wait_for_udr_update(info);
  
  	return ret;
  }
  
  static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
  {
  	int ret;
  	unsigned int data;
  
  	ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &data);
  	if (ret < 0) {
  		dev_err(info->dev, "%s: fail to read update reg(%d)
  ",
  			__func__, ret);
  		return ret;
  	}
  
  	data &= ~RTC_TIME_EN_MASK;
  	data |= RTC_UDR_MASK;
  
  	ret = regmap_write(info->regmap, SEC_RTC_UDR_CON, data);
  	if (ret < 0) {
  		dev_err(info->dev, "%s: fail to write update reg(%d)
  ",
  			__func__, ret);
  		return ret;
  	}
  
  	ret = s5m8767_wait_for_udr_update(info);
  
  	return ret;
  }
  
  static void s5m8763_data_to_tm(u8 *data, struct rtc_time *tm)
  {
  	tm->tm_sec = bcd2bin(data[RTC_SEC]);
  	tm->tm_min = bcd2bin(data[RTC_MIN]);
  
  	if (data[RTC_HOUR] & HOUR_12) {
  		tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
  		if (data[RTC_HOUR] & HOUR_PM)
  			tm->tm_hour += 12;
  	} else {
  		tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
  	}
  
  	tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
  	tm->tm_mday = bcd2bin(data[RTC_DATE]);
  	tm->tm_mon = bcd2bin(data[RTC_MONTH]);
  	tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
  	tm->tm_year -= 1900;
  }
  
  static void s5m8763_tm_to_data(struct rtc_time *tm, u8 *data)
  {
  	data[RTC_SEC] = bin2bcd(tm->tm_sec);
  	data[RTC_MIN] = bin2bcd(tm->tm_min);
  	data[RTC_HOUR] = bin2bcd(tm->tm_hour);
  	data[RTC_WEEKDAY] = tm->tm_wday;
  	data[RTC_DATE] = bin2bcd(tm->tm_mday);
  	data[RTC_MONTH] = bin2bcd(tm->tm_mon);
  	data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
  	data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
  }
  
  static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
  {
  	struct s5m_rtc_info *info = dev_get_drvdata(dev);
  	u8 data[8];
  	int ret;
  
  	ret = regmap_bulk_read(info->regmap, SEC_RTC_SEC, data, 8);
  	if (ret < 0)
  		return ret;
  
  	switch (info->device_type) {
  	case S5M8763X:
  		s5m8763_data_to_tm(data, tm);
  		break;
  
  	case S5M8767X:
  		s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)
  ", __func__,
  		1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
  		tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
  
  	return rtc_valid_tm(tm);
  }
  
  static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
  {
  	struct s5m_rtc_info *info = dev_get_drvdata(dev);
  	u8 data[8];
  	int ret = 0;
  
  	switch (info->device_type) {
  	case S5M8763X:
  		s5m8763_tm_to_data(tm, data);
  		break;
  	case S5M8767X:
  		ret = s5m8767_tm_to_data(tm, data);
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	if (ret < 0)
  		return ret;
  
  	dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)
  ", __func__,
  		1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
  		tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_wday);
  
  	ret = regmap_raw_write(info->regmap, SEC_RTC_SEC, data, 8);
  	if (ret < 0)
  		return ret;
  
  	ret = s5m8767_rtc_set_time_reg(info);
  
  	return ret;
  }
  
  static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
  {
  	struct s5m_rtc_info *info = dev_get_drvdata(dev);
  	u8 data[8];
  	unsigned int val;
  	int ret, i;
  
  	ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
  	if (ret < 0)
  		return ret;
  
  	switch (info->device_type) {
  	case S5M8763X:
  		s5m8763_data_to_tm(data, &alrm->time);
  		ret = regmap_read(info->regmap, SEC_ALARM0_CONF, &val);
  		if (ret < 0)
  			return ret;
  
  		alrm->enabled = !!val;
  
  		ret = regmap_read(info->regmap, SEC_RTC_STATUS, &val);
  		if (ret < 0)
  			return ret;
  
  		break;
  
  	case S5M8767X:
  		s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
  		dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)
  ", __func__,
  			1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
  			alrm->time.tm_mday, alrm->time.tm_hour,
  			alrm->time.tm_min, alrm->time.tm_sec,
  			alrm->time.tm_wday);
  
  		alrm->enabled = 0;
  		for (i = 0; i < 7; i++) {
  			if (data[i] & ALARM_ENABLE_MASK) {
  				alrm->enabled = 1;
  				break;
  			}
  		}
  
  		alrm->pending = 0;
  		ret = regmap_read(info->regmap, SEC_RTC_STATUS, &val);
  		if (ret < 0)
  			return ret;
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	if (val & ALARM0_STATUS)
  		alrm->pending = 1;
  	else
  		alrm->pending = 0;
  
  	return 0;
  }
  
  static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
  {
  	u8 data[8];
  	int ret, i;
  	struct rtc_time tm;
  
  	ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
  	if (ret < 0)
  		return ret;
  
  	s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
  	dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)
  ", __func__,
  		1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
  		tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
  
  	switch (info->device_type) {
  	case S5M8763X:
  		ret = regmap_write(info->regmap, SEC_ALARM0_CONF, 0);
  		break;
  
  	case S5M8767X:
  		for (i = 0; i < 7; i++)
  			data[i] &= ~ALARM_ENABLE_MASK;
  
  		ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
  		if (ret < 0)
  			return ret;
  
  		ret = s5m8767_rtc_set_alarm_reg(info);
  
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	return ret;
  }
  
  static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
  {
  	int ret;
  	u8 data[8];
  	u8 alarm0_conf;
  	struct rtc_time tm;
  
  	ret = regmap_bulk_read(info->regmap, SEC_ALARM0_SEC, data, 8);
  	if (ret < 0)
  		return ret;
  
  	s5m8767_data_to_tm(data, &tm, info->rtc_24hr_mode);
  	dev_dbg(info->dev, "%s: %d/%d/%d %d:%d:%d(%d)
  ", __func__,
  		1900 + tm.tm_year, 1 + tm.tm_mon, tm.tm_mday,
  		tm.tm_hour, tm.tm_min, tm.tm_sec, tm.tm_wday);
  
  	switch (info->device_type) {
  	case S5M8763X:
  		alarm0_conf = 0x77;
  		ret = regmap_write(info->regmap, SEC_ALARM0_CONF, alarm0_conf);
  		break;
  
  	case S5M8767X:
  		data[RTC_SEC] |= ALARM_ENABLE_MASK;
  		data[RTC_MIN] |= ALARM_ENABLE_MASK;
  		data[RTC_HOUR] |= ALARM_ENABLE_MASK;
  		data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
  		if (data[RTC_DATE] & 0x1f)
  			data[RTC_DATE] |= ALARM_ENABLE_MASK;
  		if (data[RTC_MONTH] & 0xf)
  			data[RTC_MONTH] |= ALARM_ENABLE_MASK;
  		if (data[RTC_YEAR1] & 0x7f)
  			data[RTC_YEAR1] |= ALARM_ENABLE_MASK;
  
  		ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
  		if (ret < 0)
  			return ret;
  		ret = s5m8767_rtc_set_alarm_reg(info);
  
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	return ret;
  }
  
  static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
  {
  	struct s5m_rtc_info *info = dev_get_drvdata(dev);
  	u8 data[8];
  	int ret;
  
  	switch (info->device_type) {
  	case S5M8763X:
  		s5m8763_tm_to_data(&alrm->time, data);
  		break;
  
  	case S5M8767X:
  		s5m8767_tm_to_data(&alrm->time, data);
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	dev_dbg(dev, "%s: %d/%d/%d %d:%d:%d(%d)
  ", __func__,
  		1900 + alrm->time.tm_year, 1 + alrm->time.tm_mon,
  		alrm->time.tm_mday, alrm->time.tm_hour, alrm->time.tm_min,
  		alrm->time.tm_sec, alrm->time.tm_wday);
  
  	ret = s5m_rtc_stop_alarm(info);
  	if (ret < 0)
  		return ret;
  
  	ret = regmap_raw_write(info->regmap, SEC_ALARM0_SEC, data, 8);
  	if (ret < 0)
  		return ret;
  
  	ret = s5m8767_rtc_set_alarm_reg(info);
  	if (ret < 0)
  		return ret;
  
  	if (alrm->enabled)
  		ret = s5m_rtc_start_alarm(info);
  
  	return ret;
  }
  
  static int s5m_rtc_alarm_irq_enable(struct device *dev,
  				    unsigned int enabled)
  {
  	struct s5m_rtc_info *info = dev_get_drvdata(dev);
  
  	if (enabled)
  		return s5m_rtc_start_alarm(info);
  	else
  		return s5m_rtc_stop_alarm(info);
  }
  
  static irqreturn_t s5m_rtc_alarm_irq(int irq, void *data)
  {
  	struct s5m_rtc_info *info = data;
  
  	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
  
  	return IRQ_HANDLED;
  }
  
  static const struct rtc_class_ops s5m_rtc_ops = {
  	.read_time = s5m_rtc_read_time,
  	.set_time = s5m_rtc_set_time,
  	.read_alarm = s5m_rtc_read_alarm,
  	.set_alarm = s5m_rtc_set_alarm,
  	.alarm_irq_enable = s5m_rtc_alarm_irq_enable,
  };
  
  static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
  {
  	int ret;
  	ret = regmap_update_bits(info->regmap, SEC_WTSR_SMPL_CNTL,
  				 WTSR_ENABLE_MASK,
  				 enable ? WTSR_ENABLE_MASK : 0);
  	if (ret < 0)
  		dev_err(info->dev, "%s: fail to update WTSR reg(%d)
  ",
  			__func__, ret);
  }
  
  static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
  {
  	int ret;
  	ret = regmap_update_bits(info->regmap, SEC_WTSR_SMPL_CNTL,
  				 SMPL_ENABLE_MASK,
  				 enable ? SMPL_ENABLE_MASK : 0);
  	if (ret < 0)
  		dev_err(info->dev, "%s: fail to update SMPL reg(%d)
  ",
  			__func__, ret);
  }
  
  static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
  {
  	u8 data[2];
  	unsigned int tp_read;
  	int ret;
  	struct rtc_time tm;
  
  	ret = regmap_read(info->regmap, SEC_RTC_UDR_CON, &tp_read);
  	if (ret < 0) {
  		dev_err(info->dev, "%s: fail to read control reg(%d)
  ",
  			__func__, ret);
  		return ret;
  	}
  
  	/* Set RTC control register : Binary mode, 24hour mode */
  	data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
  	data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
  
  	info->rtc_24hr_mode = 1;
  	ret = regmap_raw_write(info->regmap, SEC_ALARM0_CONF, data, 2);
  	if (ret < 0) {
  		dev_err(info->dev, "%s: fail to write controlm reg(%d)
  ",
  			__func__, ret);
  		return ret;
  	}
  
  	/* In first boot time, Set rtc time to 1/1/2012 00:00:00(SUN) */
  	if ((tp_read & RTC_TCON_MASK) == 0) {
  		dev_dbg(info->dev, "rtc init
  ");
  		tm.tm_sec = 0;
  		tm.tm_min = 0;
  		tm.tm_hour = 0;
  		tm.tm_wday = 0;
  		tm.tm_mday = 1;
  		tm.tm_mon = 0;
  		tm.tm_year = 112;
  		tm.tm_yday = 0;
  		tm.tm_isdst = 0;
  		ret = s5m_rtc_set_time(info->dev, &tm);
  	}
  
  	ret = regmap_update_bits(info->regmap, SEC_RTC_UDR_CON,
  				 RTC_TCON_MASK, tp_read | RTC_TCON_MASK);
  	if (ret < 0)
  		dev_err(info->dev, "%s: fail to update TCON reg(%d)
  ",
  			__func__, ret);
  
  	return ret;
  }
  
  static int s5m_rtc_probe(struct platform_device *pdev)
  {
  	struct sec_pmic_dev *s5m87xx = dev_get_drvdata(pdev->dev.parent);
  	struct sec_platform_data *pdata = s5m87xx->pdata;
  	struct s5m_rtc_info *info;
  	int ret;
  
  	if (!pdata) {
  		dev_err(pdev->dev.parent, "Platform data not supplied
  ");
  		return -ENODEV;
  	}
  
  	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
  	if (!info)
  		return -ENOMEM;
  
  	info->dev = &pdev->dev;
  	info->s5m87xx = s5m87xx;
  	info->regmap = s5m87xx->regmap_rtc;
  	info->device_type = s5m87xx->device_type;
  	info->wtsr_smpl = s5m87xx->wtsr_smpl;
  
  	switch (pdata->device_type) {
  	case S5M8763X:
  		info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
  				S5M8763_IRQ_ALARM0);
  		break;
  
  	case S5M8767X:
  		info->irq = regmap_irq_get_virq(s5m87xx->irq_data,
  				S5M8767_IRQ_RTCA1);
  		break;
  
  	default:
  		ret = -EINVAL;
  		dev_err(&pdev->dev, "Unsupported device type: %d
  ", ret);
  		return ret;
  	}
  
  	platform_set_drvdata(pdev, info);
  
  	ret = s5m8767_rtc_init_reg(info);
  
  	if (info->wtsr_smpl) {
  		s5m_rtc_enable_wtsr(info, true);
  		s5m_rtc_enable_smpl(info, true);
  	}
  
  	device_init_wakeup(&pdev->dev, 1);
  
  	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
  						 &s5m_rtc_ops, THIS_MODULE);
  
  	if (IS_ERR(info->rtc_dev))
  		return PTR_ERR(info->rtc_dev);
  
  	ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
  					s5m_rtc_alarm_irq, 0, "rtc-alarm0",
  					info);
  	if (ret < 0)
  		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d
  ",
  			info->irq, ret);
  
  	return ret;
  }
  
  static void s5m_rtc_shutdown(struct platform_device *pdev)
  {
  	struct s5m_rtc_info *info = platform_get_drvdata(pdev);
  	int i;
  	unsigned int val = 0;
  	if (info->wtsr_smpl) {
  		for (i = 0; i < 3; i++) {
  			s5m_rtc_enable_wtsr(info, false);
  			regmap_read(info->regmap, SEC_WTSR_SMPL_CNTL, &val);
  			pr_debug("%s: WTSR_SMPL reg(0x%02x)
  ", __func__, val);
  			if (val & WTSR_ENABLE_MASK)
  				pr_emerg("%s: fail to disable WTSR
  ",
  					 __func__);
  			else {
  				pr_info("%s: success to disable WTSR
  ",
  					__func__);
  				break;
  			}
  		}
  	}
  	/* Disable SMPL when power off */
  	s5m_rtc_enable_smpl(info, false);
  }
  
  #ifdef CONFIG_PM_SLEEP
  static int s5m_rtc_resume(struct device *dev)
  {
  	struct s5m_rtc_info *info = dev_get_drvdata(dev);
  	int ret = 0;
  
  	if (device_may_wakeup(dev))
  		ret = disable_irq_wake(info->irq);
  
  	return ret;
  }
  
  static int s5m_rtc_suspend(struct device *dev)
  {
  	struct s5m_rtc_info *info = dev_get_drvdata(dev);
  	int ret = 0;
  
  	if (device_may_wakeup(dev))
  		ret = enable_irq_wake(info->irq);
  
  	return ret;
  }
  #endif /* CONFIG_PM_SLEEP */
  
  static SIMPLE_DEV_PM_OPS(s5m_rtc_pm_ops, s5m_rtc_suspend, s5m_rtc_resume);
  
  static const struct platform_device_id s5m_rtc_id[] = {
  	{ "s5m-rtc", 0 },
  };
  
  static struct platform_driver s5m_rtc_driver = {
  	.driver		= {
  		.name	= "s5m-rtc",
  		.owner	= THIS_MODULE,
  		.pm	= &s5m_rtc_pm_ops,
  	},
  	.probe		= s5m_rtc_probe,
  	.shutdown	= s5m_rtc_shutdown,
  	.id_table	= s5m_rtc_id,
  };
  
  module_platform_driver(s5m_rtc_driver);
  
  /* Module information */
  MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
  MODULE_DESCRIPTION("Samsung S5M RTC driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:s5m-rtc");