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32 results

ice_main.c

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  • rtc-max77686.c 21.52 KiB
    /*
     * RTC driver for Maxim MAX77686 and MAX77802
     *
     * Copyright (C) 2012 Samsung Electronics Co.Ltd
     *
     *  based on rtc-max8997.c
     *
     *  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/i2c.h>
    #include <linux/slab.h>
    #include <linux/rtc.h>
    #include <linux/delay.h>
    #include <linux/mutex.h>
    #include <linux/module.h>
    #include <linux/platform_device.h>
    #include <linux/mfd/max77686-private.h>
    #include <linux/irqdomain.h>
    #include <linux/regmap.h>
    
    #define MAX77686_I2C_ADDR_RTC		(0x0C >> 1)
    #define MAX77620_I2C_ADDR_RTC		0x68
    #define MAX77686_INVALID_I2C_ADDR	(-1)
    
    /* Define non existing register */
    #define MAX77686_INVALID_REG		(-1)
    
    /* RTC Control Register */
    #define BCD_EN_SHIFT			0
    #define BCD_EN_MASK			BIT(BCD_EN_SHIFT)
    #define MODEL24_SHIFT			1
    #define MODEL24_MASK			BIT(MODEL24_SHIFT)
    /* RTC Update Register1 */
    #define RTC_UDR_SHIFT			0
    #define RTC_UDR_MASK			BIT(RTC_UDR_SHIFT)
    #define RTC_RBUDR_SHIFT			4
    #define RTC_RBUDR_MASK			BIT(RTC_RBUDR_SHIFT)
    /* RTC Hour register */
    #define HOUR_PM_SHIFT			6
    #define HOUR_PM_MASK			BIT(HOUR_PM_SHIFT)
    /* RTC Alarm Enable */
    #define ALARM_ENABLE_SHIFT		7
    #define ALARM_ENABLE_MASK		BIT(ALARM_ENABLE_SHIFT)
    
    #define REG_RTC_NONE			0xdeadbeef
    
    /*
     * MAX77802 has separate register (RTCAE1) for alarm enable instead
     * using 1 bit from registers RTC{SEC,MIN,HOUR,DAY,MONTH,YEAR,DATE}
     * as in done in MAX77686.
     */
    #define MAX77802_ALARM_ENABLE_VALUE	0x77
    
    enum {
    	RTC_SEC = 0,
    	RTC_MIN,
    	RTC_HOUR,
    	RTC_WEEKDAY,
    	RTC_MONTH,
    	RTC_YEAR,
    	RTC_DATE,
    	RTC_NR_TIME
    };
    
    struct max77686_rtc_driver_data {
    	/* Minimum usecs needed for a RTC update */
    	unsigned long		delay;
    	/* Mask used to read RTC registers value */
    	u8			mask;
    	/* Registers offset to I2C addresses map */
    	const unsigned int	*map;
    	/* Has a separate alarm enable register? */
    	bool			alarm_enable_reg;
    	/* I2C address for RTC block */
    	int			rtc_i2c_addr;
    	/* RTC interrupt via platform resource */
    	bool			rtc_irq_from_platform;
    	/* Pending alarm status register */
    	int			alarm_pending_status_reg;
    	/* RTC IRQ CHIP for regmap */
    	const struct regmap_irq_chip *rtc_irq_chip;
    };
    
    struct max77686_rtc_info {
    	struct device		*dev;
    	struct i2c_client	*rtc;
    	struct rtc_device	*rtc_dev;
    	struct mutex		lock;
    
    	struct regmap		*regmap;
    	struct regmap		*rtc_regmap;
    
    	const struct max77686_rtc_driver_data *drv_data;
    	struct regmap_irq_chip_data *rtc_irq_data;
    
    	int rtc_irq;
    	int virq;
    	int rtc_24hr_mode;
    };
    
    enum MAX77686_RTC_OP {
    	MAX77686_RTC_WRITE,
    	MAX77686_RTC_READ,
    };
    
    /* These are not registers but just offsets that are mapped to addresses */
    enum max77686_rtc_reg_offset {
    	REG_RTC_CONTROLM = 0,
    	REG_RTC_CONTROL,
    	REG_RTC_UPDATE0,
    	REG_WTSR_SMPL_CNTL,
    	REG_RTC_SEC,
    	REG_RTC_MIN,
    	REG_RTC_HOUR,
    	REG_RTC_WEEKDAY,
    	REG_RTC_MONTH,
    	REG_RTC_YEAR,
    	REG_RTC_DATE,
    	REG_ALARM1_SEC,
    	REG_ALARM1_MIN,
    	REG_ALARM1_HOUR,
    	REG_ALARM1_WEEKDAY,
    	REG_ALARM1_MONTH,
    	REG_ALARM1_YEAR,
    	REG_ALARM1_DATE,
    	REG_ALARM2_SEC,
    	REG_ALARM2_MIN,
    	REG_ALARM2_HOUR,
    	REG_ALARM2_WEEKDAY,
    	REG_ALARM2_MONTH,
    	REG_ALARM2_YEAR,
    	REG_ALARM2_DATE,
    	REG_RTC_AE1,
    	REG_RTC_END,
    };
    
    /* Maps RTC registers offset to the MAX77686 register addresses */
    static const unsigned int max77686_map[REG_RTC_END] = {
    	[REG_RTC_CONTROLM]   = MAX77686_RTC_CONTROLM,
    	[REG_RTC_CONTROL]    = MAX77686_RTC_CONTROL,
    	[REG_RTC_UPDATE0]    = MAX77686_RTC_UPDATE0,
    	[REG_WTSR_SMPL_CNTL] = MAX77686_WTSR_SMPL_CNTL,
    	[REG_RTC_SEC]        = MAX77686_RTC_SEC,
    	[REG_RTC_MIN]        = MAX77686_RTC_MIN,
    	[REG_RTC_HOUR]       = MAX77686_RTC_HOUR,
    	[REG_RTC_WEEKDAY]    = MAX77686_RTC_WEEKDAY,
    	[REG_RTC_MONTH]      = MAX77686_RTC_MONTH,
    	[REG_RTC_YEAR]       = MAX77686_RTC_YEAR,
    	[REG_RTC_DATE]       = MAX77686_RTC_DATE,
    	[REG_ALARM1_SEC]     = MAX77686_ALARM1_SEC,
    	[REG_ALARM1_MIN]     = MAX77686_ALARM1_MIN,
    	[REG_ALARM1_HOUR]    = MAX77686_ALARM1_HOUR,
    	[REG_ALARM1_WEEKDAY] = MAX77686_ALARM1_WEEKDAY,
    	[REG_ALARM1_MONTH]   = MAX77686_ALARM1_MONTH,
    	[REG_ALARM1_YEAR]    = MAX77686_ALARM1_YEAR,
    	[REG_ALARM1_DATE]    = MAX77686_ALARM1_DATE,
    	[REG_ALARM2_SEC]     = MAX77686_ALARM2_SEC,
    	[REG_ALARM2_MIN]     = MAX77686_ALARM2_MIN,
    	[REG_ALARM2_HOUR]    = MAX77686_ALARM2_HOUR,
    	[REG_ALARM2_WEEKDAY] = MAX77686_ALARM2_WEEKDAY,
    	[REG_ALARM2_MONTH]   = MAX77686_ALARM2_MONTH,
    	[REG_ALARM2_YEAR]    = MAX77686_ALARM2_YEAR,
    	[REG_ALARM2_DATE]    = MAX77686_ALARM2_DATE,
    	[REG_RTC_AE1]	     = REG_RTC_NONE,
    };
    
    static const struct regmap_irq max77686_rtc_irqs[] = {
    	/* RTC interrupts */
    	REGMAP_IRQ_REG(0, 0, MAX77686_RTCINT_RTC60S_MSK),
    	REGMAP_IRQ_REG(1, 0, MAX77686_RTCINT_RTCA1_MSK),
    	REGMAP_IRQ_REG(2, 0, MAX77686_RTCINT_RTCA2_MSK),
    	REGMAP_IRQ_REG(3, 0, MAX77686_RTCINT_SMPL_MSK),
    	REGMAP_IRQ_REG(4, 0, MAX77686_RTCINT_RTC1S_MSK),
    	REGMAP_IRQ_REG(5, 0, MAX77686_RTCINT_WTSR_MSK),
    };
    
    static const struct regmap_irq_chip max77686_rtc_irq_chip = {
    	.name		= "max77686-rtc",
    	.status_base	= MAX77686_RTC_INT,
    	.mask_base	= MAX77686_RTC_INTM,
    	.num_regs	= 1,
    	.irqs		= max77686_rtc_irqs,
    	.num_irqs	= ARRAY_SIZE(max77686_rtc_irqs),
    };
    
    static const struct max77686_rtc_driver_data max77686_drv_data = {
    	.delay = 16000,
    	.mask  = 0x7f,
    	.map   = max77686_map,
    	.alarm_enable_reg  = false,
    	.rtc_irq_from_platform = false,
    	.alarm_pending_status_reg = MAX77686_REG_STATUS2,
    	.rtc_i2c_addr = MAX77686_I2C_ADDR_RTC,
    	.rtc_irq_chip = &max77686_rtc_irq_chip,
    };
    
    static const struct max77686_rtc_driver_data max77620_drv_data = {
    	.delay = 16000,
    	.mask  = 0x7f,
    	.map   = max77686_map,
    	.alarm_enable_reg  = false,
    	.rtc_irq_from_platform = true,
    	.alarm_pending_status_reg = MAX77686_INVALID_REG,
    	.rtc_i2c_addr = MAX77620_I2C_ADDR_RTC,
    	.rtc_irq_chip = &max77686_rtc_irq_chip,
    };
    
    static const unsigned int max77802_map[REG_RTC_END] = {
    	[REG_RTC_CONTROLM]   = MAX77802_RTC_CONTROLM,
    	[REG_RTC_CONTROL]    = MAX77802_RTC_CONTROL,
    	[REG_RTC_UPDATE0]    = MAX77802_RTC_UPDATE0,
    	[REG_WTSR_SMPL_CNTL] = MAX77802_WTSR_SMPL_CNTL,
    	[REG_RTC_SEC]        = MAX77802_RTC_SEC,
    	[REG_RTC_MIN]        = MAX77802_RTC_MIN,
    	[REG_RTC_HOUR]       = MAX77802_RTC_HOUR,
    	[REG_RTC_WEEKDAY]    = MAX77802_RTC_WEEKDAY,
    	[REG_RTC_MONTH]      = MAX77802_RTC_MONTH,
    	[REG_RTC_YEAR]       = MAX77802_RTC_YEAR,
    	[REG_RTC_DATE]       = MAX77802_RTC_DATE,
    	[REG_ALARM1_SEC]     = MAX77802_ALARM1_SEC,
    	[REG_ALARM1_MIN]     = MAX77802_ALARM1_MIN,
    	[REG_ALARM1_HOUR]    = MAX77802_ALARM1_HOUR,
    	[REG_ALARM1_WEEKDAY] = MAX77802_ALARM1_WEEKDAY,
    	[REG_ALARM1_MONTH]   = MAX77802_ALARM1_MONTH,
    	[REG_ALARM1_YEAR]    = MAX77802_ALARM1_YEAR,
    	[REG_ALARM1_DATE]    = MAX77802_ALARM1_DATE,
    	[REG_ALARM2_SEC]     = MAX77802_ALARM2_SEC,
    	[REG_ALARM2_MIN]     = MAX77802_ALARM2_MIN,
    	[REG_ALARM2_HOUR]    = MAX77802_ALARM2_HOUR,
    	[REG_ALARM2_WEEKDAY] = MAX77802_ALARM2_WEEKDAY,
    	[REG_ALARM2_MONTH]   = MAX77802_ALARM2_MONTH,
    	[REG_ALARM2_YEAR]    = MAX77802_ALARM2_YEAR,
    	[REG_ALARM2_DATE]    = MAX77802_ALARM2_DATE,
    	[REG_RTC_AE1]	     = MAX77802_RTC_AE1,
    };
    
    static const struct regmap_irq_chip max77802_rtc_irq_chip = {
    	.name		= "max77802-rtc",
    	.status_base	= MAX77802_RTC_INT,
    	.mask_base	= MAX77802_RTC_INTM,
    	.num_regs	= 1,
    	.irqs		= max77686_rtc_irqs, /* same masks as 77686 */
    	.num_irqs	= ARRAY_SIZE(max77686_rtc_irqs),
    };
    
    static const struct max77686_rtc_driver_data max77802_drv_data = {
    	.delay = 200,
    	.mask  = 0xff,
    	.map   = max77802_map,
    	.alarm_enable_reg  = true,
    	.rtc_irq_from_platform = false,
    	.alarm_pending_status_reg = MAX77686_REG_STATUS2,
    	.rtc_i2c_addr = MAX77686_INVALID_I2C_ADDR,
    	.rtc_irq_chip = &max77802_rtc_irq_chip,
    };
    
    static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
    				    struct max77686_rtc_info *info)
    {
    	u8 mask = info->drv_data->mask;
    
    	tm->tm_sec = data[RTC_SEC] & mask;
    	tm->tm_min = data[RTC_MIN] & mask;
    	if (info->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;
    	}
    
    	/* Only a single bit is set in data[], so fls() would be equivalent */
    	tm->tm_wday = ffs(data[RTC_WEEKDAY] & mask) - 1;
    	tm->tm_mday = data[RTC_DATE] & 0x1f;
    	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
    	tm->tm_year = data[RTC_YEAR] & mask;
    	tm->tm_yday = 0;
    	tm->tm_isdst = 0;
    
    	/*
    	 * MAX77686 uses 1 bit from sec/min/hour/etc RTC registers and the
    	 * year values are just 0..99 so add 100 to support up to 2099.
    	 */
    	if (!info->drv_data->alarm_enable_reg)
    		tm->tm_year += 100;
    }
    
    static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data,
    				   struct max77686_rtc_info *info)
    {
    	data[RTC_SEC] = tm->tm_sec;
    	data[RTC_MIN] = tm->tm_min;
    	data[RTC_HOUR] = tm->tm_hour;
    	data[RTC_WEEKDAY] = 1 << tm->tm_wday;
    	data[RTC_DATE] = tm->tm_mday;
    	data[RTC_MONTH] = tm->tm_mon + 1;
    
    	if (info->drv_data->alarm_enable_reg) {
    		data[RTC_YEAR] = tm->tm_year;
    		return 0;
    	}
    
    	data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
    
    	if (tm->tm_year < 100) {
    		dev_err(info->dev, "RTC cannot handle the year %d.\n",
    			1900 + tm->tm_year);
    		return -EINVAL;
    	}
    
    	return 0;
    }
    
    static int max77686_rtc_update(struct max77686_rtc_info *info,
    			       enum MAX77686_RTC_OP op)
    {
    	int ret;
    	unsigned int data;
    	unsigned long delay = info->drv_data->delay;
    
    	if (op == MAX77686_RTC_WRITE)
    		data = 1 << RTC_UDR_SHIFT;
    	else
    		data = 1 << RTC_RBUDR_SHIFT;
    
    	ret = regmap_update_bits(info->rtc_regmap,
    				 info->drv_data->map[REG_RTC_UPDATE0],
    				 data, data);
    	if (ret < 0)
    		dev_err(info->dev, "Fail to write update reg(ret=%d, data=0x%x)\n",
    			ret, data);
    	else {
    		/* Minimum delay required before RTC update. */
    		usleep_range(delay, delay * 2);
    	}
    
    	return ret;
    }
    
    static int max77686_rtc_read_time(struct device *dev, struct rtc_time *tm)
    {
    	struct max77686_rtc_info *info = dev_get_drvdata(dev);
    	u8 data[RTC_NR_TIME];
    	int ret;
    
    	mutex_lock(&info->lock);
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
    	if (ret < 0)
    		goto out;
    
    	ret = regmap_bulk_read(info->rtc_regmap,
    			       info->drv_data->map[REG_RTC_SEC],
    			       data, ARRAY_SIZE(data));
    	if (ret < 0) {
    		dev_err(info->dev, "Fail to read time reg(%d)\n", ret);
    		goto out;
    	}
    
    	max77686_rtc_data_to_tm(data, tm, info);
    
    	ret = rtc_valid_tm(tm);
    
    out:
    	mutex_unlock(&info->lock);
    	return ret;
    }
    
    static int max77686_rtc_set_time(struct device *dev, struct rtc_time *tm)
    {
    	struct max77686_rtc_info *info = dev_get_drvdata(dev);
    	u8 data[RTC_NR_TIME];
    	int ret;
    
    	ret = max77686_rtc_tm_to_data(tm, data, info);
    	if (ret < 0)
    		return ret;
    
    	mutex_lock(&info->lock);
    
    	ret = regmap_bulk_write(info->rtc_regmap,
    				info->drv_data->map[REG_RTC_SEC],
    				data, ARRAY_SIZE(data));
    	if (ret < 0) {
    		dev_err(info->dev, "Fail to write time reg(%d)\n", ret);
    		goto out;
    	}
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
    
    out:
    	mutex_unlock(&info->lock);
    	return ret;
    }
    
    static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
    {
    	struct max77686_rtc_info *info = dev_get_drvdata(dev);
    	u8 data[RTC_NR_TIME];
    	unsigned int val;
    	const unsigned int *map = info->drv_data->map;
    	int i, ret;
    
    	mutex_lock(&info->lock);
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
    	if (ret < 0)
    		goto out;
    
    	ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
    			       data, ARRAY_SIZE(data));
    	if (ret < 0) {
    		dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
    		goto out;
    	}
    
    	max77686_rtc_data_to_tm(data, &alrm->time, info);
    
    	alrm->enabled = 0;
    
    	if (info->drv_data->alarm_enable_reg) {
    		if (map[REG_RTC_AE1] == REG_RTC_NONE) {
    			ret = -EINVAL;
    			dev_err(info->dev,
    				"alarm enable register not set(%d)\n", ret);
    			goto out;
    		}
    
    		ret = regmap_read(info->rtc_regmap, map[REG_RTC_AE1], &val);
    		if (ret < 0) {
    			dev_err(info->dev,
    				"fail to read alarm enable(%d)\n", ret);
    			goto out;
    		}
    
    		if (val)
    			alrm->enabled = 1;
    	} else {
    		for (i = 0; i < ARRAY_SIZE(data); i++) {
    			if (data[i] & ALARM_ENABLE_MASK) {
    				alrm->enabled = 1;
    				break;
    			}
    		}
    	}
    
    	alrm->pending = 0;
    
    	if (info->drv_data->alarm_pending_status_reg == MAX77686_INVALID_REG)
    		goto out;
    
    	ret = regmap_read(info->regmap,
    			  info->drv_data->alarm_pending_status_reg, &val);
    	if (ret < 0) {
    		dev_err(info->dev,
    			"Fail to read alarm pending status reg(%d)\n", ret);
    		goto out;
    	}
    
    	if (val & (1 << 4)) /* RTCA1 */
    		alrm->pending = 1;
    
    out:
    	mutex_unlock(&info->lock);
    	return ret;
    }
    
    static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
    {
    	u8 data[RTC_NR_TIME];
    	int ret, i;
    	struct rtc_time tm;
    	const unsigned int *map = info->drv_data->map;
    
    	if (!mutex_is_locked(&info->lock))
    		dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
    	if (ret < 0)
    		goto out;
    
    	if (info->drv_data->alarm_enable_reg) {
    		if (map[REG_RTC_AE1] == REG_RTC_NONE) {
    			ret = -EINVAL;
    			dev_err(info->dev,
    				"alarm enable register not set(%d)\n", ret);
    			goto out;
    		}
    
    		ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1], 0);
    	} else {
    		ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
    				       data, ARRAY_SIZE(data));
    		if (ret < 0) {
    			dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
    			goto out;
    		}
    
    		max77686_rtc_data_to_tm(data, &tm, info);
    
    		for (i = 0; i < ARRAY_SIZE(data); i++)
    			data[i] &= ~ALARM_ENABLE_MASK;
    
    		ret = regmap_bulk_write(info->rtc_regmap, map[REG_ALARM1_SEC],
    					data, ARRAY_SIZE(data));
    	}
    
    	if (ret < 0) {
    		dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
    		goto out;
    	}
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
    out:
    	return ret;
    }
    
    static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
    {
    	u8 data[RTC_NR_TIME];
    	int ret;
    	struct rtc_time tm;
    	const unsigned int *map = info->drv_data->map;
    
    	if (!mutex_is_locked(&info->lock))
    		dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
    	if (ret < 0)
    		goto out;
    
    	if (info->drv_data->alarm_enable_reg) {
    		ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1],
    				   MAX77802_ALARM_ENABLE_VALUE);
    	} else {
    		ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
    				       data, ARRAY_SIZE(data));
    		if (ret < 0) {
    			dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
    			goto out;
    		}
    
    		max77686_rtc_data_to_tm(data, &tm, info);
    
    		data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
    		data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
    		data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
    		data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
    		if (data[RTC_MONTH] & 0xf)
    			data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
    		if (data[RTC_YEAR] & info->drv_data->mask)
    			data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
    		if (data[RTC_DATE] & 0x1f)
    			data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
    
    		ret = regmap_bulk_write(info->rtc_regmap, map[REG_ALARM1_SEC],
    					data, ARRAY_SIZE(data));
    	}
    
    	if (ret < 0) {
    		dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
    		goto out;
    	}
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
    out:
    	return ret;
    }
    
    static int max77686_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
    {
    	struct max77686_rtc_info *info = dev_get_drvdata(dev);
    	u8 data[RTC_NR_TIME];
    	int ret;
    
    	ret = max77686_rtc_tm_to_data(&alrm->time, data, info);
    	if (ret < 0)
    		return ret;
    
    	mutex_lock(&info->lock);
    
    	ret = max77686_rtc_stop_alarm(info);
    	if (ret < 0)
    		goto out;
    
    	ret = regmap_bulk_write(info->rtc_regmap,
    				info->drv_data->map[REG_ALARM1_SEC],
    				data, ARRAY_SIZE(data));
    
    	if (ret < 0) {
    		dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
    		goto out;
    	}
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
    	if (ret < 0)
    		goto out;
    
    	if (alrm->enabled)
    		ret = max77686_rtc_start_alarm(info);
    out:
    	mutex_unlock(&info->lock);
    	return ret;
    }
    
    static int max77686_rtc_alarm_irq_enable(struct device *dev,
    					 unsigned int enabled)
    {
    	struct max77686_rtc_info *info = dev_get_drvdata(dev);
    	int ret;
    
    	mutex_lock(&info->lock);
    	if (enabled)
    		ret = max77686_rtc_start_alarm(info);
    	else
    		ret = max77686_rtc_stop_alarm(info);
    	mutex_unlock(&info->lock);
    
    	return ret;
    }
    
    static irqreturn_t max77686_rtc_alarm_irq(int irq, void *data)
    {
    	struct max77686_rtc_info *info = data;
    
    	dev_dbg(info->dev, "RTC alarm IRQ: %d\n", irq);
    
    	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
    
    	return IRQ_HANDLED;
    }
    
    static const struct rtc_class_ops max77686_rtc_ops = {
    	.read_time = max77686_rtc_read_time,
    	.set_time = max77686_rtc_set_time,
    	.read_alarm = max77686_rtc_read_alarm,
    	.set_alarm = max77686_rtc_set_alarm,
    	.alarm_irq_enable = max77686_rtc_alarm_irq_enable,
    };
    
    static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
    {
    	u8 data[2];
    	int ret;
    
    	/* Set RTC control register : Binary mode, 24hour mdoe */
    	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_bulk_write(info->rtc_regmap,
    				info->drv_data->map[REG_RTC_CONTROLM],
    				data, ARRAY_SIZE(data));
    	if (ret < 0) {
    		dev_err(info->dev, "Fail to write controlm reg(%d)\n", ret);
    		return ret;
    	}
    
    	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
    	return ret;
    }
    
    static const struct regmap_config max77686_rtc_regmap_config = {
    	.reg_bits = 8,
    	.val_bits = 8,
    };
    
    static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
    {
    	struct device *parent = info->dev->parent;
    	struct i2c_client *parent_i2c = to_i2c_client(parent);
    	int ret;
    
    	if (info->drv_data->rtc_irq_from_platform) {
    		struct platform_device *pdev = to_platform_device(info->dev);
    
    		info->rtc_irq = platform_get_irq(pdev, 0);
    		if (info->rtc_irq < 0) {
    			dev_err(info->dev, "Failed to get rtc interrupts: %d\n",
    				info->rtc_irq);
    			return info->rtc_irq;
    		}
    	} else {
    		info->rtc_irq =  parent_i2c->irq;
    	}
    
    	info->regmap = dev_get_regmap(parent, NULL);
    	if (!info->regmap) {
    		dev_err(info->dev, "Failed to get rtc regmap\n");
    		return -ENODEV;
    	}
    
    	if (info->drv_data->rtc_i2c_addr == MAX77686_INVALID_I2C_ADDR) {
    		info->rtc_regmap = info->regmap;
    		goto add_rtc_irq;
    	}
    
    	info->rtc = i2c_new_dummy(parent_i2c->adapter,
    				  info->drv_data->rtc_i2c_addr);
    	if (!info->rtc) {
    		dev_err(info->dev, "Failed to allocate I2C device for RTC\n");
    		return -ENODEV;
    	}
    
    	info->rtc_regmap = devm_regmap_init_i2c(info->rtc,
    						&max77686_rtc_regmap_config);
    	if (IS_ERR(info->rtc_regmap)) {
    		ret = PTR_ERR(info->rtc_regmap);
    		dev_err(info->dev, "Failed to allocate RTC regmap: %d\n", ret);
    		goto err_unregister_i2c;
    	}
    
    add_rtc_irq:
    	ret = regmap_add_irq_chip(info->rtc_regmap, info->rtc_irq,
    				  IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
    				  IRQF_SHARED, 0, info->drv_data->rtc_irq_chip,
    				  &info->rtc_irq_data);
    	if (ret < 0) {
    		dev_err(info->dev, "Failed to add RTC irq chip: %d\n", ret);
    		goto err_unregister_i2c;
    	}
    
    	return 0;
    
    err_unregister_i2c:
    	if (info->rtc)
    		i2c_unregister_device(info->rtc);
    	return ret;
    }
    
    static int max77686_rtc_probe(struct platform_device *pdev)
    {
    	struct max77686_rtc_info *info;
    	const struct platform_device_id *id = platform_get_device_id(pdev);
    	int ret;
    
    	info = devm_kzalloc(&pdev->dev, sizeof(struct max77686_rtc_info),
    			    GFP_KERNEL);
    	if (!info)
    		return -ENOMEM;
    
    	mutex_init(&info->lock);
    	info->dev = &pdev->dev;
    	info->drv_data = (const struct max77686_rtc_driver_data *)
    		id->driver_data;
    
    	ret = max77686_init_rtc_regmap(info);
    	if (ret < 0)
    		return ret;
    
    	platform_set_drvdata(pdev, info);
    
    	ret = max77686_rtc_init_reg(info);
    	if (ret < 0) {
    		dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
    		goto err_rtc;
    	}
    
    	device_init_wakeup(&pdev->dev, 1);
    
    	info->rtc_dev = devm_rtc_device_register(&pdev->dev, id->name,
    					&max77686_rtc_ops, THIS_MODULE);
    
    	if (IS_ERR(info->rtc_dev)) {
    		ret = PTR_ERR(info->rtc_dev);
    		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
    		if (ret == 0)
    			ret = -EINVAL;
    		goto err_rtc;
    	}
    
    	info->virq = regmap_irq_get_virq(info->rtc_irq_data,
    					 MAX77686_RTCIRQ_RTCA1);
    	if (info->virq <= 0) {
    		ret = -ENXIO;
    		goto err_rtc;
    	}
    
    	ret = request_threaded_irq(info->virq, NULL, max77686_rtc_alarm_irq, 0,
    				   "rtc-alarm1", info);
    	if (ret < 0) {
    		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
    			info->virq, ret);
    		goto err_rtc;
    	}
    
    	return 0;
    
    err_rtc:
    	regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
    	if (info->rtc)
    		i2c_unregister_device(info->rtc);
    
    	return ret;
    }
    
    static int max77686_rtc_remove(struct platform_device *pdev)
    {
    	struct max77686_rtc_info *info = platform_get_drvdata(pdev);
    
    	free_irq(info->virq, info);
    	regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
    	if (info->rtc)
    		i2c_unregister_device(info->rtc);
    
    	return 0;
    }
    
    #ifdef CONFIG_PM_SLEEP
    static int max77686_rtc_suspend(struct device *dev)
    {
    	if (device_may_wakeup(dev)) {
    		struct max77686_rtc_info *info = dev_get_drvdata(dev);
    
    		return enable_irq_wake(info->virq);
    	}
    
    	return 0;
    }
    
    static int max77686_rtc_resume(struct device *dev)
    {
    	if (device_may_wakeup(dev)) {
    		struct max77686_rtc_info *info = dev_get_drvdata(dev);
    
    		return disable_irq_wake(info->virq);
    	}
    
    	return 0;
    }
    #endif
    
    static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
    			 max77686_rtc_suspend, max77686_rtc_resume);
    
    static const struct platform_device_id rtc_id[] = {
    	{ "max77686-rtc", .driver_data = (kernel_ulong_t)&max77686_drv_data, },
    	{ "max77802-rtc", .driver_data = (kernel_ulong_t)&max77802_drv_data, },
    	{ "max77620-rtc", .driver_data = (kernel_ulong_t)&max77620_drv_data, },
    	{},
    };
    MODULE_DEVICE_TABLE(platform, rtc_id);
    
    static struct platform_driver max77686_rtc_driver = {
    	.driver		= {
    		.name	= "max77686-rtc",
    		.pm	= &max77686_rtc_pm_ops,
    	},
    	.probe		= max77686_rtc_probe,
    	.remove		= max77686_rtc_remove,
    	.id_table	= rtc_id,
    };
    
    module_platform_driver(max77686_rtc_driver);
    
    MODULE_DESCRIPTION("Maxim MAX77686 RTC driver");
    MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
    MODULE_LICENSE("GPL");