[mirror_ubuntu-artful-kernel.git] / drivers / rtc / rtc-max77686.c

/*
 * RTC driver for Maxim MAX77686
 *
 * 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/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>

/* 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)
#define RTC_RBUDR_SHIFT			4
#define RTC_RBUDR_MASK			(1 << RTC_RBUDR_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)

#define MAX77686_RTC_UPDATE_DELAY	16

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

struct max77686_rtc_info {
	struct device		*dev;
	struct max77686_dev	*max77686;
	struct i2c_client	*rtc;
	struct rtc_device	*rtc_dev;
	struct mutex		lock;

	struct regmap		*regmap;

	int virq;
	int rtc_24hr_mode;
};

enum MAX77686_RTC_OP {
	MAX77686_RTC_WRITE,
	MAX77686_RTC_READ,
};

static inline int max77686_rtc_calculate_wday(u8 shifted)
{
	int counter = -1;
	while (shifted) {
		shifted >>= 1;
		counter++;
	}
	return counter;
}

static void max77686_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 = max77686_rtc_calculate_wday(data[RTC_WEEKDAY] & 0x7f);
	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 max77686_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("%s: MAX77686 RTC cannot handle the year %d."
			"Assume it's 2000.\n", __func__, 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;

	if (op == MAX77686_RTC_WRITE)
		data = 1 << RTC_UDR_SHIFT;
	else
		data = 1 << RTC_RBUDR_SHIFT;

	ret = regmap_update_bits(info->max77686->rtc_regmap,
				 MAX77686_RTC_UPDATE0, data, data);
	if (ret < 0)
		dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n",
				__func__, ret, data);
	else {
		/* Minimum 16ms delay required before RTC update. */
		msleep(MAX77686_RTC_UPDATE_DELAY);
	}

	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->max77686->rtc_regmap,
				MAX77686_RTC_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,	ret);
		goto out;
	}

	max77686_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);

	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);
	if (ret < 0)
		return ret;

	mutex_lock(&info->lock);

	ret = regmap_bulk_write(info->max77686->rtc_regmap,
				 MAX77686_RTC_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
				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;
	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->max77686->rtc_regmap,
				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
				__func__, __LINE__, ret);
		goto out;
	}

	max77686_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 = regmap_read(info->max77686->regmap, MAX77686_REG_STATUS2, &val);
	if (ret < 0) {
		dev_err(info->dev, "%s:%d fail to read status2 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 max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
{
	u8 data[RTC_NR_TIME];
	int ret, i;
	struct rtc_time tm;

	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;

	ret = regmap_bulk_read(info->max77686->rtc_regmap,
				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);

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

	ret = regmap_bulk_write(info->max77686->rtc_regmap,
				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
				__func__, 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;

	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;

	ret = regmap_bulk_read(info->max77686->rtc_regmap,
				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);

	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 = regmap_bulk_write(info->max77686->rtc_regmap,
				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
				__func__, 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);
	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->max77686->rtc_regmap,
				 MAX77686_ALARM1_SEC, data, RTC_NR_TIME);

	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
				__func__, 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_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 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->max77686->rtc_regmap, MAX77686_RTC_CONTROLM, data, 2);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
				__func__, ret);
		return ret;
	}

	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
	return ret;
}

static int max77686_rtc_probe(struct platform_device *pdev)
{
	struct max77686_dev *max77686 = dev_get_drvdata(pdev->dev.parent);
	struct max77686_rtc_info *info;
	int ret;

	dev_info(&pdev->dev, "%s\n", __func__);

	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->max77686 = max77686;
	info->rtc = max77686->rtc;

	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, "max77686-rtc",
					&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;
	}

	if (!max77686->rtc_irq_data) {
		ret = -EINVAL;
		dev_err(&pdev->dev, "%s: no RTC regmap IRQ chip\n", __func__);
		goto err_rtc;
	}

	info->virq = regmap_irq_get_virq(max77686->rtc_irq_data,
					 MAX77686_RTCIRQ_RTCA1);
	if (!info->virq) {
		ret = -ENXIO;
		goto err_rtc;
	}

	ret = devm_request_threaded_irq(&pdev->dev, 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);

err_rtc:
	return ret;
}

#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", 0 },
	{},
};

static struct platform_driver max77686_rtc_driver = {
	.driver		= {
		.name	= "max77686-rtc",
		.owner	= THIS_MODULE,
		.pm	= &max77686_rtc_pm_ops,
	},
	.probe		= max77686_rtc_probe,
	.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");
Commit	Line	Data
fca1dd03 JL	1	/*
	2	* RTC driver for Maxim MAX77686
	3	*
	4	* Copyright (C) 2012 Samsung Electronics Co.Ltd
	5	*
	6	* based on rtc-max8997.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
	15	#include <linux/slab.h>
	16	#include <linux/rtc.h>
	17	#include <linux/delay.h>
	18	#include <linux/mutex.h>
	19	#include <linux/module.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/mfd/max77686-private.h>
	22	#include <linux/irqdomain.h>
	23	#include <linux/regmap.h>
	24
	25	/* RTC Control Register */
	26	#define BCD_EN_SHIFT 0
ac60bf31	27	#define BCD_EN_MASK (1 << BCD_EN_SHIFT)
fca1dd03 JL	28	#define MODEL24_SHIFT 1
	29	#define MODEL24_MASK (1 << MODEL24_SHIFT)
	30	/* RTC Update Register1 */
	31	#define RTC_UDR_SHIFT 0
	32	#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT)
	33	#define RTC_RBUDR_SHIFT 4
	34	#define RTC_RBUDR_MASK (1 << RTC_RBUDR_SHIFT)
fca1dd03 JL	35	/* RTC Hour register */
	36	#define HOUR_PM_SHIFT 6
	37	#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT)
	38	/* RTC Alarm Enable */
	39	#define ALARM_ENABLE_SHIFT 7
	40	#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT)
	41
	42	#define MAX77686_RTC_UPDATE_DELAY 16
fca1dd03 JL	43
	44	enum {
	45	RTC_SEC = 0,
	46	RTC_MIN,
	47	RTC_HOUR,
	48	RTC_WEEKDAY,
	49	RTC_MONTH,
	50	RTC_YEAR,
	51	RTC_DATE,
	52	RTC_NR_TIME
	53	};
	54
	55	struct max77686_rtc_info {
	56	struct device *dev;
	57	struct max77686_dev *max77686;
	58	struct i2c_client *rtc;
	59	struct rtc_device *rtc_dev;
	60	struct mutex lock;
	61
	62	struct regmap *regmap;
	63
	64	int virq;
	65	int rtc_24hr_mode;
	66	};
	67
	68	enum MAX77686_RTC_OP {
	69	MAX77686_RTC_WRITE,
	70	MAX77686_RTC_READ,
	71	};
	72
	73	static inline int max77686_rtc_calculate_wday(u8 shifted)
	74	{
	75	int counter = -1;
	76	while (shifted) {
	77	shifted >>= 1;
	78	counter++;
	79	}
	80	return counter;
	81	}
	82
	83	static void max77686_rtc_data_to_tm(u8 data, struct rtc_time tm,
	84	int rtc_24hr_mode)
	85	{
	86	tm->tm_sec = data[RTC_SEC] & 0x7f;
	87	tm->tm_min = data[RTC_MIN] & 0x7f;
	88	if (rtc_24hr_mode)
	89	tm->tm_hour = data[RTC_HOUR] & 0x1f;
	90	else {
	91	tm->tm_hour = data[RTC_HOUR] & 0x0f;
	92	if (data[RTC_HOUR] & HOUR_PM_MASK)
	93	tm->tm_hour += 12;
	94	}
	95
	96	tm->tm_wday = max77686_rtc_calculate_wday(data[RTC_WEEKDAY] & 0x7f);
	97	tm->tm_mday = data[RTC_DATE] & 0x1f;
	98	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
	99	tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;
	100	tm->tm_yday = 0;
	101	tm->tm_isdst = 0;
	102	}
	103
	104	static int max77686_rtc_tm_to_data(struct rtc_time tm, u8 data)
	105	{
	106	data[RTC_SEC] = tm->tm_sec;
107	data[RTC_MIN] = tm->tm_min;
108	data[RTC_HOUR] = tm->tm_hour;
109	data[RTC_WEEKDAY] = 1 << tm->tm_wday;
110	data[RTC_DATE] = tm->tm_mday;
111	data[RTC_MONTH] = tm->tm_mon + 1;
cdf5f4ac	112	data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
fca1dd03 JL	113
	114	if (tm->tm_year < 100) {
	115	pr_warn("%s: MAX77686 RTC cannot handle the year %d."
	116	"Assume it's 2000.\n", __func__, 1900 + tm->tm_year);
	117	return -EINVAL;
	118	}
	119	return 0;
	120	}
	121
	122	static int max77686_rtc_update(struct max77686_rtc_info *info,
	123	enum MAX77686_RTC_OP op)
	124	{
	125	int ret;
	126	unsigned int data;
	127
	128	if (op == MAX77686_RTC_WRITE)
	129	data = 1 << RTC_UDR_SHIFT;
	130	else
	131	data = 1 << RTC_RBUDR_SHIFT;
	132
	133	ret = regmap_update_bits(info->max77686->rtc_regmap,
	134	MAX77686_RTC_UPDATE0, data, data);
	135	if (ret < 0)
	136	dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n",
	137	__func__, ret, data);
	138	else {
	139	/* Minimum 16ms delay required before RTC update. */
	140	msleep(MAX77686_RTC_UPDATE_DELAY);
	141	}
	142
	143	return ret;
	144	}
	145
	146	static int max77686_rtc_read_time(struct device dev, struct rtc_time tm)
	147	{
	148	struct max77686_rtc_info *info = dev_get_drvdata(dev);
	149	u8 data[RTC_NR_TIME];
	150	int ret;
	151
	152	mutex_lock(&info->lock);
	153
	154	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
	155	if (ret < 0)
	156	goto out;
	157
	158	ret = regmap_bulk_read(info->max77686->rtc_regmap,
	159	MAX77686_RTC_SEC, data, RTC_NR_TIME);
	160	if (ret < 0) {
	161	dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__, ret);
	162	goto out;
	163	}
	164
	165	max77686_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);
	166
	167	ret = rtc_valid_tm(tm);
	168
	169	out:
	170	mutex_unlock(&info->lock);
	171	return ret;
	172	}
	173
	174	static int max77686_rtc_set_time(struct device dev, struct rtc_time tm)
	175	{
	176	struct max77686_rtc_info *info = dev_get_drvdata(dev);
177	u8 data[RTC_NR_TIME];
178	int ret;
179
180	ret = max77686_rtc_tm_to_data(tm, data);
181	if (ret < 0)
182	return ret;
183
184	mutex_lock(&info->lock);
185
186	ret = regmap_bulk_write(info->max77686->rtc_regmap,
187	MAX77686_RTC_SEC, data, RTC_NR_TIME);
188	if (ret < 0) {
189	dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
190	ret);
191	goto out;
192	}
193
194	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
195
196	out:
197	mutex_unlock(&info->lock);
198	return ret;
199	}
200
201	static int max77686_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
202	{
203	struct max77686_rtc_info *info = dev_get_drvdata(dev);
204	u8 data[RTC_NR_TIME];
205	unsigned int val;
206	int i, ret;
207
208	mutex_lock(&info->lock);
209
210	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
211	if (ret < 0)
212	goto out;
213
214	ret = regmap_bulk_read(info->max77686->rtc_regmap,
215	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
216	if (ret < 0) {
217	dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
218	__func__, __LINE__, ret);
219	goto out;
220	}
221
222	max77686_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
223
224	alrm->enabled = 0;
225	for (i = 0; i < RTC_NR_TIME; i++) {
226	if (data[i] & ALARM_ENABLE_MASK) {
227	alrm->enabled = 1;
228	break;
229	}
230	}
231
232	alrm->pending = 0;
1748cbf7	233	ret = regmap_read(info->max77686->regmap, MAX77686_REG_STATUS2, &val);
fca1dd03	234	if (ret < 0) {
1748cbf7	235	dev_err(info->dev, "%s:%d fail to read status2 reg(%d)\n",
fca1dd03 JL	236	__func__, __LINE__, ret);
	237	goto out;
	238	}
	239
	240	if (val & (1 << 4)) /* RTCA1 */
	241	alrm->pending = 1;
	242
	243	out:
	244	mutex_unlock(&info->lock);
	245	return 0;
	246	}
	247
	248	static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
	249	{
	250	u8 data[RTC_NR_TIME];
	251	int ret, i;
	252	struct rtc_time tm;
	253
	254	if (!mutex_is_locked(&info->lock))
	255	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
	256
	257	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
	258	if (ret < 0)
	259	goto out;
	260
	261	ret = regmap_bulk_read(info->max77686->rtc_regmap,
	262	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	263	if (ret < 0) {
	264	dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
	265	__func__, ret);
	266	goto out;
	267	}
	268
	269	max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);
	270
	271	for (i = 0; i < RTC_NR_TIME; i++)
	272	data[i] &= ~ALARM_ENABLE_MASK;
	273
	274	ret = regmap_bulk_write(info->max77686->rtc_regmap,
	275	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	276	if (ret < 0) {
	277	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
	278	__func__, ret);
	279	goto out;
	280	}
	281
	282	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
	283	out:
	284	return ret;
	285	}
	286
	287	static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
	288	{
	289	u8 data[RTC_NR_TIME];
	290	int ret;
	291	struct rtc_time tm;
	292
	293	if (!mutex_is_locked(&info->lock))
	294	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
	295
	296	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
	297	if (ret < 0)
	298	goto out;
	299
300	ret = regmap_bulk_read(info->max77686->rtc_regmap,
301	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
302	if (ret < 0) {
303	dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
304	__func__, ret);
305	goto out;
306	}
307
308	max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);
309
310	data[RTC_SEC] \|= (1 << ALARM_ENABLE_SHIFT);
311	data[RTC_MIN] \|= (1 << ALARM_ENABLE_SHIFT);
312	data[RTC_HOUR] \|= (1 << ALARM_ENABLE_SHIFT);
313	data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
314	if (data[RTC_MONTH] & 0xf)
315	data[RTC_MONTH] \|= (1 << ALARM_ENABLE_SHIFT);
316	if (data[RTC_YEAR] & 0x7f)
317	data[RTC_YEAR] \|= (1 << ALARM_ENABLE_SHIFT);
318	if (data[RTC_DATE] & 0x1f)
319	data[RTC_DATE] \|= (1 << ALARM_ENABLE_SHIFT);
320
321	ret = regmap_bulk_write(info->max77686->rtc_regmap,
322	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
323	if (ret < 0) {
324	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
325	__func__, ret);
326	goto out;
327	}
328
329	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
330	out:
331	return ret;
332	}
333
334	static int max77686_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
335	{
336	struct max77686_rtc_info *info = dev_get_drvdata(dev);
337	u8 data[RTC_NR_TIME];
338	int ret;
339
340	ret = max77686_rtc_tm_to_data(&alrm->time, data);
341	if (ret < 0)
342	return ret;
343
344	mutex_lock(&info->lock);
345
346	ret = max77686_rtc_stop_alarm(info);
347	if (ret < 0)
348	goto out;
349
350	ret = regmap_bulk_write(info->max77686->rtc_regmap,
351	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
352
353	if (ret < 0) {
354	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
355	__func__, ret);
356	goto out;
357	}
358
359	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
360	if (ret < 0)
361	goto out;
362
363	if (alrm->enabled)
364	ret = max77686_rtc_start_alarm(info);
365	out:
366	mutex_unlock(&info->lock);
367	return ret;
368	}
369
370	static int max77686_rtc_alarm_irq_enable(struct device *dev,
371	unsigned int enabled)
372	{
373	struct max77686_rtc_info *info = dev_get_drvdata(dev);
374	int ret;
375
376	mutex_lock(&info->lock);
377	if (enabled)
378	ret = max77686_rtc_start_alarm(info);
379	else
380	ret = max77686_rtc_stop_alarm(info);
381	mutex_unlock(&info->lock);
382
383	return ret;
384	}
385
386	static irqreturn_t max77686_rtc_alarm_irq(int irq, void *data)
387	{
388	struct max77686_rtc_info *info = data;
389
390	dev_info(info->dev, "%s:irq(%d)\n", __func__, irq);
391
392	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF \| RTC_AF);
393
394	return IRQ_HANDLED;
395	}
396
397	static const struct rtc_class_ops max77686_rtc_ops = {
398	.read_time = max77686_rtc_read_time,
399	.set_time = max77686_rtc_set_time,
400	.read_alarm = max77686_rtc_read_alarm,
401	.set_alarm = max77686_rtc_set_alarm,
402	.alarm_irq_enable = max77686_rtc_alarm_irq_enable,
403	};
404
fca1dd03 JL	405	static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
	406	{
	407	u8 data[2];
	408	int ret;
	409
	410	/* Set RTC control register : Binary mode, 24hour mdoe */
	411	data[0] = (1 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
	412	data[1] = (0 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
	413
	414	info->rtc_24hr_mode = 1;
	415
	416	ret = regmap_bulk_write(info->max77686->rtc_regmap, MAX77686_RTC_CONTROLM, data, 2);
	417	if (ret < 0) {
	418	dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
	419	__func__, ret);
	420	return ret;
	421	}
	422
	423	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
	424	return ret;
	425	}
	426
fca1dd03 JL	427	static int max77686_rtc_probe(struct platform_device *pdev)
	428	{
	429	struct max77686_dev *max77686 = dev_get_drvdata(pdev->dev.parent);
	430	struct max77686_rtc_info *info;
6f1c1e71	431	int ret;
fca1dd03	432
3cebeb53	433	dev_info(&pdev->dev, "%s\n", __func__);
fca1dd03	434
0f64f853 JH	435	info = devm_kzalloc(&pdev->dev, sizeof(struct max77686_rtc_info),
0f64f853 JH	436	GFP_KERNEL);
fca1dd03 JL	437	if (!info)
	438	return -ENOMEM;
	439
	440	mutex_init(&info->lock);
	441	info->dev = &pdev->dev;
	442	info->max77686 = max77686;
	443	info->rtc = max77686->rtc;
6f1c1e71	444
fca1dd03 JL	445	platform_set_drvdata(pdev, info);
	446
	447	ret = max77686_rtc_init_reg(info);
	448
	449	if (ret < 0) {
	450	dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
	451	goto err_rtc;
	452	}
	453
fca1dd03 JL	454	device_init_wakeup(&pdev->dev, 1);
fca1dd03 JL	455
f56950ec JH	456	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77686-rtc",
f56950ec JH	457	&max77686_rtc_ops, THIS_MODULE);
fca1dd03 JL	458
fca1dd03 JL	459	if (IS_ERR(info->rtc_dev)) {
fca1dd03 JL	460	ret = PTR_ERR(info->rtc_dev);
	461	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
	462	if (ret == 0)
	463	ret = -EINVAL;
	464	goto err_rtc;
	465	}
6f1c1e71	466
1745d6d3 JMC	467	if (!max77686->rtc_irq_data) {
	468	ret = -EINVAL;
	469	dev_err(&pdev->dev, "%s: no RTC regmap IRQ chip\n", __func__);
	470	goto err_rtc;
	471	}
	472
6f1c1e71 JMC	473	info->virq = regmap_irq_get_virq(max77686->rtc_irq_data,
	474	MAX77686_RTCIRQ_RTCA1);
	475	if (!info->virq) {
ad819039	476	ret = -ENXIO;
fca1dd03	477	goto err_rtc;
ad819039	478	}
fca1dd03	479
6f1c1e71 JMC	480	ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL,
6f1c1e71 JMC	481	max77686_rtc_alarm_irq, 0, "rtc-alarm1", info);
ad819039	482	if (ret < 0)
fca1dd03 JL	483	dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
fca1dd03 JL	484	info->virq, ret);
fca1dd03	485
fca1dd03	486	err_rtc:
fca1dd03 JL	487	return ret;
	488	}
	489
e7f7fc73 DA	490	#ifdef CONFIG_PM_SLEEP
	491	static int max77686_rtc_suspend(struct device *dev)
	492	{
	493	if (device_may_wakeup(dev)) {
	494	struct max77686_rtc_info *info = dev_get_drvdata(dev);
	495
	496	return enable_irq_wake(info->virq);
	497	}
	498
	499	return 0;
	500	}
	501
	502	static int max77686_rtc_resume(struct device *dev)
	503	{
	504	if (device_may_wakeup(dev)) {
	505	struct max77686_rtc_info *info = dev_get_drvdata(dev);
	506
	507	return disable_irq_wake(info->virq);
	508	}
	509
	510	return 0;
	511	}
	512	#endif
	513
	514	static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
	515	max77686_rtc_suspend, max77686_rtc_resume);
	516
fca1dd03 JL	517	static const struct platform_device_id rtc_id[] = {
	518	{ "max77686-rtc", 0 },
	519	{},
	520	};
	521
	522	static struct platform_driver max77686_rtc_driver = {
	523	.driver = {
	524	.name = "max77686-rtc",
	525	.owner = THIS_MODULE,
e7f7fc73	526	.pm = &max77686_rtc_pm_ops,
fca1dd03 JL	527	},
fca1dd03 JL	528	.probe = max77686_rtc_probe,
fca1dd03 JL	529	.id_table = rtc_id,
	530	};
	531
0c58ff58	532	module_platform_driver(max77686_rtc_driver);
fca1dd03 JL	533
fca1dd03 JL	534	MODULE_DESCRIPTION("Maxim MAX77686 RTC driver");
f5b1d3c5	535	MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
fca1dd03	536	MODULE_LICENSE("GPL");