[linux-2.6-block.git] / drivers / rtc / rtc-max8997.c

/*
 * RTC driver for Maxim MAX8997
 *
 * Copyright (C) 2013 Samsung Electronics Co.Ltd
 *
 *  based on rtc-max8998.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.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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/max8997-private.h>
#include <linux/irqdomain.h>

/* Module parameter for WTSR function control */
static int wtsr_en = 1;
module_param(wtsr_en, int, 0444);
MODULE_PARM_DESC(wtsr_en, "Watchdog Timeout & Software Reset (default=on)");
/* Module parameter for SMPL function control */
static int smpl_en = 1;
module_param(smpl_en, int, 0444);
MODULE_PARM_DESC(smpl_en, "Sudden Momentary Power Loss (default=on)");

/* RTC Control Register */
#define BCD_EN_SHIFT			0
#define BCD_EN_MASK			(1 << BCD_EN_SHIFT)
#define MODEL24_SHIFT			1
#define MODEL24_MASK			(1 << MODEL24_SHIFT)
/* RTC Update Register1 */
#define RTC_UDR_SHIFT			0
#define RTC_UDR_MASK			(1 << RTC_UDR_SHIFT)
/* WTSR and SMPL Register */
#define WTSRT_SHIFT			0
#define SMPLT_SHIFT			2
#define WTSR_EN_SHIFT			6
#define SMPL_EN_SHIFT			7
#define WTSRT_MASK			(3 << WTSRT_SHIFT)
#define SMPLT_MASK			(3 << SMPLT_SHIFT)
#define WTSR_EN_MASK			(1 << WTSR_EN_SHIFT)
#define SMPL_EN_MASK			(1 << SMPL_EN_SHIFT)
/* RTC Hour register */
#define HOUR_PM_SHIFT			6
#define HOUR_PM_MASK			(1 << HOUR_PM_SHIFT)
/* RTC Alarm Enable */
#define ALARM_ENABLE_SHIFT		7
#define ALARM_ENABLE_MASK		(1 << ALARM_ENABLE_SHIFT)

enum {
	RTC_SEC = 0,
	RTC_MIN,
	RTC_HOUR,
	RTC_WEEKDAY,
	RTC_MONTH,
	RTC_YEAR,
	RTC_DATE,
	RTC_NR_TIME
};

struct max8997_rtc_info {
	struct device		*dev;
	struct max8997_dev	*max8997;
	struct i2c_client	*rtc;
	struct rtc_device	*rtc_dev;
	struct mutex		lock;
	int virq;
	int rtc_24hr_mode;
};

static void max8997_rtc_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 = fls(data[RTC_WEEKDAY] & 0x7f) - 1;
	tm->tm_mday = data[RTC_DATE] & 0x1f;
	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
	tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;
	tm->tm_yday = 0;
	tm->tm_isdst = 0;
}

static int max8997_rtc_tm_to_data(struct rtc_time *tm, u8 *data)
{
	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;
	data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;

	if (tm->tm_year < 100) {
		pr_warn("RTC cannot handle the year %d.  Assume it's 2000.\n",
			1900 + tm->tm_year);
		return -EINVAL;
	}
	return 0;
}

static inline int max8997_rtc_set_update_reg(struct max8997_rtc_info *info)
{
	int ret;

	ret = max8997_write_reg(info->rtc, MAX8997_RTC_UPDATE1,
						RTC_UDR_MASK);
	if (ret < 0)
		dev_err(info->dev, "%s: fail to write update reg(%d)\n",
				__func__, ret);
	else {
		/* Minimum 16ms delay required before RTC update.
		 * Otherwise, we may read and update based on out-of-date
		 * value */
		msleep(20);
	}

	return ret;
}

static int max8997_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	int ret;

	mutex_lock(&info->lock);
	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
	mutex_unlock(&info->lock);

	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,
				ret);
		return ret;
	}

	max8997_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);

	return rtc_valid_tm(tm);
}

static int max8997_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	int ret;

	ret = max8997_rtc_tm_to_data(tm, data);
	if (ret < 0)
		return ret;

	mutex_lock(&info->lock);

	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
				ret);
		goto out;
	}

	ret = max8997_rtc_set_update_reg(info);
out:
	mutex_unlock(&info->lock);
	return ret;
}

static int max8997_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	u8 val;
	int i, ret;

	mutex_lock(&info->lock);

	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
			data);
	if (ret < 0) {
		dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
				__func__, __LINE__, ret);
		goto out;
	}

	max8997_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);

	alrm->enabled = 0;
	for (i = 0; i < RTC_NR_TIME; i++) {
		if (data[i] & ALARM_ENABLE_MASK) {
			alrm->enabled = 1;
			break;
		}
	}

	alrm->pending = 0;
	ret = max8997_read_reg(info->max8997->i2c, MAX8997_REG_STATUS1, &val);
	if (ret < 0) {
		dev_err(info->dev, "%s:%d fail to read status1 reg(%d)\n",
				__func__, __LINE__, ret);
		goto out;
	}

	if (val & (1 << 4)) /* RTCA1 */
		alrm->pending = 1;

out:
	mutex_unlock(&info->lock);
	return 0;
}

static int max8997_rtc_stop_alarm(struct max8997_rtc_info *info)
{
	u8 data[RTC_NR_TIME];
	int ret, i;

	if (!mutex_is_locked(&info->lock))
		dev_warn(info->dev, "%s: should have mutex locked\n", __func__);

	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
				data);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	for (i = 0; i < RTC_NR_TIME; i++)
		data[i] &= ~ALARM_ENABLE_MASK;

	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
				 data);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	ret = max8997_rtc_set_update_reg(info);
out:
	return ret;
}

static int max8997_rtc_start_alarm(struct max8997_rtc_info *info)
{
	u8 data[RTC_NR_TIME];
	int ret;

	if (!mutex_is_locked(&info->lock))
		dev_warn(info->dev, "%s: should have mutex locked\n", __func__);

	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
				data);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	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] & 0x7f)
		data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
	if (data[RTC_DATE] & 0x1f)
		data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);

	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
				 data);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	ret = max8997_rtc_set_update_reg(info);
out:
	return ret;
}
static int max8997_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	int ret;

	ret = max8997_rtc_tm_to_data(&alrm->time, data);
	if (ret < 0)
		return ret;

	dev_info(info->dev, "%s: %d-%02d-%02d %02d:%02d:%02d\n", __func__,
			data[RTC_YEAR] + 2000, data[RTC_MONTH], data[RTC_DATE],
			data[RTC_HOUR], data[RTC_MIN], data[RTC_SEC]);

	mutex_lock(&info->lock);

	ret = max8997_rtc_stop_alarm(info);
	if (ret < 0)
		goto out;

	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
				data);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	ret = max8997_rtc_set_update_reg(info);
	if (ret < 0)
		goto out;

	if (alrm->enabled)
		ret = max8997_rtc_start_alarm(info);
out:
	mutex_unlock(&info->lock);
	return ret;
}

static int max8997_rtc_alarm_irq_enable(struct device *dev,
					unsigned int enabled)
{
	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	int ret;

	mutex_lock(&info->lock);
	if (enabled)
		ret = max8997_rtc_start_alarm(info);
	else
		ret = max8997_rtc_stop_alarm(info);
	mutex_unlock(&info->lock);

	return ret;
}

static irqreturn_t max8997_rtc_alarm_irq(int irq, void *data)
{
	struct max8997_rtc_info *info = data;

	dev_info(info->dev, "%s:irq(%d)\n", __func__, irq);

	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);

	return IRQ_HANDLED;
}

static const struct rtc_class_ops max8997_rtc_ops = {
	.read_time = max8997_rtc_read_time,
	.set_time = max8997_rtc_set_time,
	.read_alarm = max8997_rtc_read_alarm,
	.set_alarm = max8997_rtc_set_alarm,
	.alarm_irq_enable = max8997_rtc_alarm_irq_enable,
};

static void max8997_rtc_enable_wtsr(struct max8997_rtc_info *info, bool enable)
{
	int ret;
	u8 val, mask;

	if (!wtsr_en)
		return;

	if (enable)
		val = (1 << WTSR_EN_SHIFT) | (3 << WTSRT_SHIFT);
	else
		val = 0;

	mask = WTSR_EN_MASK | WTSRT_MASK;

	dev_info(info->dev, "%s: %s WTSR\n", __func__,
			enable ? "enable" : "disable");

	ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
				__func__, ret);
		return;
	}

	max8997_rtc_set_update_reg(info);
}

static void max8997_rtc_enable_smpl(struct max8997_rtc_info *info, bool enable)
{
	int ret;
	u8 val, mask;

	if (!smpl_en)
		return;

	if (enable)
		val = (1 << SMPL_EN_SHIFT) | (0 << SMPLT_SHIFT);
	else
		val = 0;

	mask = SMPL_EN_MASK | SMPLT_MASK;

	dev_info(info->dev, "%s: %s SMPL\n", __func__,
			enable ? "enable" : "disable");

	ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
				__func__, ret);
		return;
	}

	max8997_rtc_set_update_reg(info);

	val = 0;
	max8997_read_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, &val);
	pr_info("WTSR_SMPL(0x%02x)\n", val);
}

static int max8997_rtc_init_reg(struct max8997_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 = max8997_bulk_write(info->rtc, MAX8997_RTC_CTRLMASK, 2, data);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
				__func__, ret);
		return ret;
	}

	ret = max8997_rtc_set_update_reg(info);
	return ret;
}

static int max8997_rtc_probe(struct platform_device *pdev)
{
	struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
	struct max8997_rtc_info *info;
	int ret, virq;

	info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_rtc_info),
			GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	mutex_init(&info->lock);
	info->dev = &pdev->dev;
	info->max8997 = max8997;
	info->rtc = max8997->rtc;

	platform_set_drvdata(pdev, info);

	ret = max8997_rtc_init_reg(info);

	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
		return ret;
	}

	max8997_rtc_enable_wtsr(info, true);
	max8997_rtc_enable_smpl(info, true);

	device_init_wakeup(&pdev->dev, 1);

	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8997-rtc",
					&max8997_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);
		return ret;
	}

	virq = irq_create_mapping(max8997->irq_domain, MAX8997_PMICIRQ_RTCA1);
	if (!virq) {
		dev_err(&pdev->dev, "Failed to create mapping alarm IRQ\n");
		ret = -ENXIO;
		goto err_out;
	}
	info->virq = virq;

	ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
				max8997_rtc_alarm_irq, 0,
				"rtc-alarm0", info);
	if (ret < 0)
		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
			info->virq, ret);

err_out:
	return ret;
}

static void max8997_rtc_shutdown(struct platform_device *pdev)
{
	struct max8997_rtc_info *info = platform_get_drvdata(pdev);

	max8997_rtc_enable_wtsr(info, false);
	max8997_rtc_enable_smpl(info, false);
}

static const struct platform_device_id rtc_id[] = {
	{ "max8997-rtc", 0 },
	{},
};
MODULE_DEVICE_TABLE(platform, rtc_id);

static struct platform_driver max8997_rtc_driver = {
	.driver		= {
		.name	= "max8997-rtc",
	},
	.probe		= max8997_rtc_probe,
	.shutdown	= max8997_rtc_shutdown,
	.id_table	= rtc_id,
};

module_platform_driver(max8997_rtc_driver);

MODULE_DESCRIPTION("Maxim MAX8997 RTC driver");
MODULE_AUTHOR("<ms925.kim@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
5e0b2704 JL	1	/*
	2	* RTC driver for Maxim MAX8997
	3	*
	4	* Copyright (C) 2013 Samsung Electronics Co.Ltd
	5	*
	6	* based on rtc-max8998.c
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
a737e835 JP	15	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a737e835 JP	16
5e0b2704 JL	17	#include <linux/slab.h>
	18	#include <linux/rtc.h>
	19	#include <linux/delay.h>
	20	#include <linux/mutex.h>
	21	#include <linux/module.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/mfd/max8997-private.h>
	24	#include <linux/irqdomain.h>
	25
	26	/* Module parameter for WTSR function control */
	27	static int wtsr_en = 1;
	28	module_param(wtsr_en, int, 0444);
a895d57d	29	MODULE_PARM_DESC(wtsr_en, "Watchdog Timeout & Software Reset (default=on)");
5e0b2704 JL	30	/* Module parameter for SMPL function control */
	31	static int smpl_en = 1;
	32	module_param(smpl_en, int, 0444);
	33	MODULE_PARM_DESC(smpl_en, "Sudden Momentary Power Loss (default=on)");
	34
	35	/* RTC Control Register */
	36	#define BCD_EN_SHIFT 0
	37	#define BCD_EN_MASK (1 << BCD_EN_SHIFT)
	38	#define MODEL24_SHIFT 1
	39	#define MODEL24_MASK (1 << MODEL24_SHIFT)
	40	/* RTC Update Register1 */
	41	#define RTC_UDR_SHIFT 0
	42	#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT)
	43	/* WTSR and SMPL Register */
	44	#define WTSRT_SHIFT 0
	45	#define SMPLT_SHIFT 2
	46	#define WTSR_EN_SHIFT 6
	47	#define SMPL_EN_SHIFT 7
	48	#define WTSRT_MASK (3 << WTSRT_SHIFT)
	49	#define SMPLT_MASK (3 << SMPLT_SHIFT)
	50	#define WTSR_EN_MASK (1 << WTSR_EN_SHIFT)
	51	#define SMPL_EN_MASK (1 << SMPL_EN_SHIFT)
	52	/* RTC Hour register */
	53	#define HOUR_PM_SHIFT 6
	54	#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT)
	55	/* RTC Alarm Enable */
	56	#define ALARM_ENABLE_SHIFT 7
	57	#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT)
	58
	59	enum {
	60	RTC_SEC = 0,
	61	RTC_MIN,
	62	RTC_HOUR,
	63	RTC_WEEKDAY,
	64	RTC_MONTH,
	65	RTC_YEAR,
	66	RTC_DATE,
	67	RTC_NR_TIME
	68	};
	69
	70	struct max8997_rtc_info {
	71	struct device *dev;
	72	struct max8997_dev *max8997;
	73	struct i2c_client *rtc;
	74	struct rtc_device *rtc_dev;
	75	struct mutex lock;
	76	int virq;
	77	int rtc_24hr_mode;
	78	};
	79
	80	static void max8997_rtc_data_to_tm(u8 data, struct rtc_time tm,
	81	int rtc_24hr_mode)
	82	{
	83	tm->tm_sec = data[RTC_SEC] & 0x7f;
	84	tm->tm_min = data[RTC_MIN] & 0x7f;
	85	if (rtc_24hr_mode)
	86	tm->tm_hour = data[RTC_HOUR] & 0x1f;
	87	else {
	88	tm->tm_hour = data[RTC_HOUR] & 0x0f;
	89	if (data[RTC_HOUR] & HOUR_PM_MASK)
	90	tm->tm_hour += 12;
	91	}
	92
	93	tm->tm_wday = fls(data[RTC_WEEKDAY] & 0x7f) - 1;
94	tm->tm_mday = data[RTC_DATE] & 0x1f;
95	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
96	tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;
97	tm->tm_yday = 0;
98	tm->tm_isdst = 0;
99	}
100
101	static int max8997_rtc_tm_to_data(struct rtc_time tm, u8 data)
102	{
103	data[RTC_SEC] = tm->tm_sec;
104	data[RTC_MIN] = tm->tm_min;
105	data[RTC_HOUR] = tm->tm_hour;
106	data[RTC_WEEKDAY] = 1 << tm->tm_wday;
107	data[RTC_DATE] = tm->tm_mday;
108	data[RTC_MONTH] = tm->tm_mon + 1;
f887a9de	109	data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
5e0b2704 JL	110
5e0b2704 JL	111	if (tm->tm_year < 100) {
a737e835 JP	112	pr_warn("RTC cannot handle the year %d. Assume it's 2000.\n",
a737e835 JP	113	1900 + tm->tm_year);
5e0b2704 JL	114	return -EINVAL;
	115	}
	116	return 0;
	117	}
	118
	119	static inline int max8997_rtc_set_update_reg(struct max8997_rtc_info *info)
	120	{
	121	int ret;
	122
	123	ret = max8997_write_reg(info->rtc, MAX8997_RTC_UPDATE1,
	124	RTC_UDR_MASK);
	125	if (ret < 0)
	126	dev_err(info->dev, "%s: fail to write update reg(%d)\n",
	127	__func__, ret);
	128	else {
	129	/* Minimum 16ms delay required before RTC update.
	130	* Otherwise, we may read and update based on out-of-date
	131	* value */
	132	msleep(20);
	133	}
	134
	135	return ret;
	136	}
	137
	138	static int max8997_rtc_read_time(struct device dev, struct rtc_time tm)
	139	{
	140	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	141	u8 data[RTC_NR_TIME];
	142	int ret;
	143
	144	mutex_lock(&info->lock);
	145	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
	146	mutex_unlock(&info->lock);
	147
	148	if (ret < 0) {
	149	dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,
	150	ret);
	151	return ret;
	152	}
	153
	154	max8997_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);
	155
	156	return rtc_valid_tm(tm);
	157	}
	158
	159	static int max8997_rtc_set_time(struct device dev, struct rtc_time tm)
	160	{
	161	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	162	u8 data[RTC_NR_TIME];
	163	int ret;
	164
	165	ret = max8997_rtc_tm_to_data(tm, data);
	166	if (ret < 0)
	167	return ret;
	168
	169	mutex_lock(&info->lock);
	170
	171	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
	172	if (ret < 0) {
	173	dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
	174	ret);
	175	goto out;
	176	}
	177
178	ret = max8997_rtc_set_update_reg(info);
179	out:
180	mutex_unlock(&info->lock);
181	return ret;
182	}
183
184	static int max8997_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
185	{
186	struct max8997_rtc_info *info = dev_get_drvdata(dev);
187	u8 data[RTC_NR_TIME];
188	u8 val;
189	int i, ret;
190
191	mutex_lock(&info->lock);
192
193	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
194	data);
195	if (ret < 0) {
196	dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
197	__func__, __LINE__, ret);
198	goto out;
199	}
200
201	max8997_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
202
203	alrm->enabled = 0;
204	for (i = 0; i < RTC_NR_TIME; i++) {
205	if (data[i] & ALARM_ENABLE_MASK) {
206	alrm->enabled = 1;
207	break;
208	}
209	}
210
211	alrm->pending = 0;
212	ret = max8997_read_reg(info->max8997->i2c, MAX8997_REG_STATUS1, &val);
213	if (ret < 0) {
214	dev_err(info->dev, "%s:%d fail to read status1 reg(%d)\n",
215	__func__, __LINE__, ret);
216	goto out;
217	}
218
219	if (val & (1 << 4)) /* RTCA1 */
220	alrm->pending = 1;
221
222	out:
223	mutex_unlock(&info->lock);
224	return 0;
225	}
226
227	static int max8997_rtc_stop_alarm(struct max8997_rtc_info *info)
228	{
229	u8 data[RTC_NR_TIME];
230	int ret, i;
231
232	if (!mutex_is_locked(&info->lock))
233	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
234
235	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
236	data);
237	if (ret < 0) {
238	dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
239	__func__, ret);
240	goto out;
241	}
242
243	for (i = 0; i < RTC_NR_TIME; i++)
244	data[i] &= ~ALARM_ENABLE_MASK;
245
246	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
247	data);
248	if (ret < 0) {
249	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
250	__func__, ret);
251	goto out;
252	}
253
254	ret = max8997_rtc_set_update_reg(info);
255	out:
256	return ret;
257	}
258
259	static int max8997_rtc_start_alarm(struct max8997_rtc_info *info)
260	{
261	u8 data[RTC_NR_TIME];
262	int ret;
263
264	if (!mutex_is_locked(&info->lock))
265	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
266
267	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
268	data);
269	if (ret < 0) {
270	dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
271	__func__, ret);
272	goto out;
273	}
274
275	data[RTC_SEC] \|= (1 << ALARM_ENABLE_SHIFT);
276	data[RTC_MIN] \|= (1 << ALARM_ENABLE_SHIFT);
277	data[RTC_HOUR] \|= (1 << ALARM_ENABLE_SHIFT);
278	data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
279	if (data[RTC_MONTH] & 0xf)
280	data[RTC_MONTH] \|= (1 << ALARM_ENABLE_SHIFT);
281	if (data[RTC_YEAR] & 0x7f)
282	data[RTC_YEAR] \|= (1 << ALARM_ENABLE_SHIFT);
283	if (data[RTC_DATE] & 0x1f)
284	data[RTC_DATE] \|= (1 << ALARM_ENABLE_SHIFT);
285
286	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
287	data);
288	if (ret < 0) {
289	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
290	__func__, ret);
291	goto out;
292	}
293
294	ret = max8997_rtc_set_update_reg(info);
295	out:
296	return ret;
297	}
298	static int max8997_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
299	{
300	struct max8997_rtc_info *info = dev_get_drvdata(dev);
301	u8 data[RTC_NR_TIME];
302	int ret;
303
304	ret = max8997_rtc_tm_to_data(&alrm->time, data);
305	if (ret < 0)
306	return ret;
307
308	dev_info(info->dev, "%s: %d-%02d-%02d %02d:%02d:%02d\n", __func__,
309	data[RTC_YEAR] + 2000, data[RTC_MONTH], data[RTC_DATE],
310	data[RTC_HOUR], data[RTC_MIN], data[RTC_SEC]);
311
312	mutex_lock(&info->lock);
313
314	ret = max8997_rtc_stop_alarm(info);
315	if (ret < 0)
316	goto out;
317
318	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
319	data);
320	if (ret < 0) {
321	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
322	__func__, ret);
323	goto out;
324	}
325
326	ret = max8997_rtc_set_update_reg(info);
327	if (ret < 0)
328	goto out;
329
330	if (alrm->enabled)
331	ret = max8997_rtc_start_alarm(info);
332	out:
333	mutex_unlock(&info->lock);
334	return ret;
335	}
336
337	static int max8997_rtc_alarm_irq_enable(struct device *dev,
338	unsigned int enabled)
339	{
340	struct max8997_rtc_info *info = dev_get_drvdata(dev);
341	int ret;
342
343	mutex_lock(&info->lock);
344	if (enabled)
345	ret = max8997_rtc_start_alarm(info);
346	else
347	ret = max8997_rtc_stop_alarm(info);
348	mutex_unlock(&info->lock);
349
350	return ret;
351	}
352
353	static irqreturn_t max8997_rtc_alarm_irq(int irq, void *data)
354	{
355	struct max8997_rtc_info *info = data;
356
357	dev_info(info->dev, "%s:irq(%d)\n", __func__, irq);
358
359	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF \| RTC_AF);
360
361	return IRQ_HANDLED;
362	}
363
364	static const struct rtc_class_ops max8997_rtc_ops = {
365	.read_time = max8997_rtc_read_time,
366	.set_time = max8997_rtc_set_time,
367	.read_alarm = max8997_rtc_read_alarm,
368	.set_alarm = max8997_rtc_set_alarm,
369	.alarm_irq_enable = max8997_rtc_alarm_irq_enable,
370	};
371
372	static void max8997_rtc_enable_wtsr(struct max8997_rtc_info *info, bool enable)
373	{
374	int ret;
375	u8 val, mask;
376
377	if (!wtsr_en)
378	return;
379
380	if (enable)
381	val = (1 << WTSR_EN_SHIFT) \| (3 << WTSRT_SHIFT);
382	else
383	val = 0;
384
385	mask = WTSR_EN_MASK \| WTSRT_MASK;
386
387	dev_info(info->dev, "%s: %s WTSR\n", __func__,
388	enable ? "enable" : "disable");
389
390	ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
391	if (ret < 0) {
392	dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
393	__func__, ret);
394	return;
395	}
396
397	max8997_rtc_set_update_reg(info);
398	}
399
400	static void max8997_rtc_enable_smpl(struct max8997_rtc_info *info, bool enable)
401	{
402	int ret;
403	u8 val, mask;
404
405	if (!smpl_en)
406	return;
407
408	if (enable)
409	val = (1 << SMPL_EN_SHIFT) \| (0 << SMPLT_SHIFT);
410	else
411	val = 0;
412
413	mask = SMPL_EN_MASK \| SMPLT_MASK;
414
415	dev_info(info->dev, "%s: %s SMPL\n", __func__,
416	enable ? "enable" : "disable");
417
418	ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
419	if (ret < 0) {
420	dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
421	__func__, ret);
422	return;
423	}
424
425	max8997_rtc_set_update_reg(info);
426
427	val = 0;
428	max8997_read_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, &val);
a737e835	429	pr_info("WTSR_SMPL(0x%02x)\n", val);
5e0b2704 JL	430	}
	431
	432	static int max8997_rtc_init_reg(struct max8997_rtc_info *info)
	433	{
	434	u8 data[2];
	435	int ret;
	436
	437	/* Set RTC control register : Binary mode, 24hour mdoe */
	438	data[0] = (1 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
	439	data[1] = (0 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
	440
	441	info->rtc_24hr_mode = 1;
	442
	443	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_CTRLMASK, 2, data);
	444	if (ret < 0) {
	445	dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
	446	__func__, ret);
	447	return ret;
	448	}
	449
	450	ret = max8997_rtc_set_update_reg(info);
	451	return ret;
	452	}
	453
	454	static int max8997_rtc_probe(struct platform_device *pdev)
	455	{
	456	struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
	457	struct max8997_rtc_info *info;
	458	int ret, virq;
	459
	460	info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_rtc_info),
	461	GFP_KERNEL);
	462	if (!info)
	463	return -ENOMEM;
	464
	465	mutex_init(&info->lock);
	466	info->dev = &pdev->dev;
	467	info->max8997 = max8997;
	468	info->rtc = max8997->rtc;
	469
	470	platform_set_drvdata(pdev, info);
	471
	472	ret = max8997_rtc_init_reg(info);
	473
	474	if (ret < 0) {
	475	dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
	476	return ret;
	477	}
	478
	479	max8997_rtc_enable_wtsr(info, true);
	480	max8997_rtc_enable_smpl(info, true);
	481
	482	device_init_wakeup(&pdev->dev, 1);
	483
4ce903cc JH	484	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8997-rtc",
4ce903cc JH	485	&max8997_rtc_ops, THIS_MODULE);
5e0b2704 JL	486
	487	if (IS_ERR(info->rtc_dev)) {
	488	ret = PTR_ERR(info->rtc_dev);
	489	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
	490	return ret;
	491	}
	492
	493	virq = irq_create_mapping(max8997->irq_domain, MAX8997_PMICIRQ_RTCA1);
	494	if (!virq) {
	495	dev_err(&pdev->dev, "Failed to create mapping alarm IRQ\n");
406dc004	496	ret = -ENXIO;
5e0b2704 JL	497	goto err_out;
	498	}
	499	info->virq = virq;
	500
c1879fe8 JH	501	ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
c1879fe8 JH	502	max8997_rtc_alarm_irq, 0,
5e0b2704	503	"rtc-alarm0", info);
406dc004	504	if (ret < 0)
5e0b2704 JL	505	dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
5e0b2704 JL	506	info->virq, ret);
5e0b2704 JL	507
5e0b2704 JL	508	err_out:
5e0b2704 JL	509	return ret;
	510	}
	511
5e0b2704 JL	512	static void max8997_rtc_shutdown(struct platform_device *pdev)
	513	{
	514	struct max8997_rtc_info *info = platform_get_drvdata(pdev);
	515
	516	max8997_rtc_enable_wtsr(info, false);
	517	max8997_rtc_enable_smpl(info, false);
	518	}
	519
	520	static const struct platform_device_id rtc_id[] = {
	521	{ "max8997-rtc", 0 },
	522	{},
	523	};
63074cc3	524	MODULE_DEVICE_TABLE(platform, rtc_id);
5e0b2704 JL	525
	526	static struct platform_driver max8997_rtc_driver = {
	527	.driver = {
	528	.name = "max8997-rtc",
5e0b2704 JL	529	},
5e0b2704 JL	530	.probe = max8997_rtc_probe,
5e0b2704 JL	531	.shutdown = max8997_rtc_shutdown,
	532	.id_table = rtc_id,
	533	};
	534
	535	module_platform_driver(max8997_rtc_driver);
	536
	537	MODULE_DESCRIPTION("Maxim MAX8997 RTC driver");
	538	MODULE_AUTHOR("<ms925.kim@samsung.com>");
	539	MODULE_LICENSE("GPL");