[linux.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.
 *
 */

#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/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 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;
	}

	/* Only a single bit is set in data[], so fls() would be equivalent */
	tm->tm_wday = ffs(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 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("RTC cannot handle the year %d.  Assume it's 2000.\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;

	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",
		.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 <[email protected]>");
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
a737e835 JP	15	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a737e835 JP	16
fca1dd03 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/max77686-private.h>
	24	#include <linux/irqdomain.h>
	25	#include <linux/regmap.h>
	26
	27	/* RTC Control Register */
	28	#define BCD_EN_SHIFT 0
ac60bf31	29	#define BCD_EN_MASK (1 << BCD_EN_SHIFT)
fca1dd03 JL	30	#define MODEL24_SHIFT 1
	31	#define MODEL24_MASK (1 << MODEL24_SHIFT)
	32	/* RTC Update Register1 */
	33	#define RTC_UDR_SHIFT 0
	34	#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT)
	35	#define RTC_RBUDR_SHIFT 4
	36	#define RTC_RBUDR_MASK (1 << RTC_RBUDR_SHIFT)
fca1dd03 JL	37	/* RTC Hour register */
	38	#define HOUR_PM_SHIFT 6
	39	#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT)
	40	/* RTC Alarm Enable */
	41	#define ALARM_ENABLE_SHIFT 7
	42	#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT)
	43
	44	#define MAX77686_RTC_UPDATE_DELAY 16
fca1dd03 JL	45
	46	enum {
	47	RTC_SEC = 0,
	48	RTC_MIN,
	49	RTC_HOUR,
	50	RTC_WEEKDAY,
	51	RTC_MONTH,
	52	RTC_YEAR,
	53	RTC_DATE,
	54	RTC_NR_TIME
	55	};
	56
	57	struct max77686_rtc_info {
	58	struct device *dev;
	59	struct max77686_dev *max77686;
	60	struct i2c_client *rtc;
	61	struct rtc_device *rtc_dev;
	62	struct mutex lock;
	63
	64	struct regmap *regmap;
	65
	66	int virq;
	67	int rtc_24hr_mode;
	68	};
	69
	70	enum MAX77686_RTC_OP {
	71	MAX77686_RTC_WRITE,
	72	MAX77686_RTC_READ,
	73	};
	74
fca1dd03 JL	75	static void max77686_rtc_data_to_tm(u8 data, struct rtc_time tm,
	76	int rtc_24hr_mode)
	77	{
	78	tm->tm_sec = data[RTC_SEC] & 0x7f;
	79	tm->tm_min = data[RTC_MIN] & 0x7f;
	80	if (rtc_24hr_mode)
	81	tm->tm_hour = data[RTC_HOUR] & 0x1f;
	82	else {
	83	tm->tm_hour = data[RTC_HOUR] & 0x0f;
	84	if (data[RTC_HOUR] & HOUR_PM_MASK)
	85	tm->tm_hour += 12;
	86	}
	87
a20cd88e JMC	88	/* Only a single bit is set in data[], so fls() would be equivalent */
a20cd88e JMC	89	tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0x7f) - 1;
fca1dd03 JL	90	tm->tm_mday = data[RTC_DATE] & 0x1f;
	91	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
	92	tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;
	93	tm->tm_yday = 0;
	94	tm->tm_isdst = 0;
	95	}
	96
	97	static int max77686_rtc_tm_to_data(struct rtc_time tm, u8 data)
	98	{
	99	data[RTC_SEC] = tm->tm_sec;
	100	data[RTC_MIN] = tm->tm_min;
	101	data[RTC_HOUR] = tm->tm_hour;
	102	data[RTC_WEEKDAY] = 1 << tm->tm_wday;
	103	data[RTC_DATE] = tm->tm_mday;
	104	data[RTC_MONTH] = tm->tm_mon + 1;
cdf5f4ac	105	data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
fca1dd03 JL	106
fca1dd03 JL	107	if (tm->tm_year < 100) {
a737e835 JP	108	pr_warn("RTC cannot handle the year %d. Assume it's 2000.\n",
a737e835 JP	109	1900 + tm->tm_year);
fca1dd03 JL	110	return -EINVAL;
	111	}
	112	return 0;
	113	}
	114
	115	static int max77686_rtc_update(struct max77686_rtc_info *info,
	116	enum MAX77686_RTC_OP op)
	117	{
	118	int ret;
	119	unsigned int data;
	120
	121	if (op == MAX77686_RTC_WRITE)
	122	data = 1 << RTC_UDR_SHIFT;
	123	else
	124	data = 1 << RTC_RBUDR_SHIFT;
	125
	126	ret = regmap_update_bits(info->max77686->rtc_regmap,
	127	MAX77686_RTC_UPDATE0, data, data);
	128	if (ret < 0)
	129	dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n",
	130	__func__, ret, data);
	131	else {
	132	/* Minimum 16ms delay required before RTC update. */
	133	msleep(MAX77686_RTC_UPDATE_DELAY);
	134	}
	135
	136	return ret;
	137	}
	138
	139	static int max77686_rtc_read_time(struct device dev, struct rtc_time tm)
	140	{
	141	struct max77686_rtc_info *info = dev_get_drvdata(dev);
	142	u8 data[RTC_NR_TIME];
	143	int ret;
	144
	145	mutex_lock(&info->lock);
	146
	147	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
	148	if (ret < 0)
	149	goto out;
	150
	151	ret = regmap_bulk_read(info->max77686->rtc_regmap,
	152	MAX77686_RTC_SEC, data, RTC_NR_TIME);
	153	if (ret < 0) {
	154	dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__, ret);
	155	goto out;
	156	}
	157
	158	max77686_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);
	159
	160	ret = rtc_valid_tm(tm);
	161
	162	out:
	163	mutex_unlock(&info->lock);
	164	return ret;
	165	}
	166
	167	static int max77686_rtc_set_time(struct device dev, struct rtc_time tm)
	168	{
	169	struct max77686_rtc_info *info = dev_get_drvdata(dev);
	170	u8 data[RTC_NR_TIME];
	171	int ret;
	172
	173	ret = max77686_rtc_tm_to_data(tm, data);
174	if (ret < 0)
175	return ret;
176
177	mutex_lock(&info->lock);
178
179	ret = regmap_bulk_write(info->max77686->rtc_regmap,
180	MAX77686_RTC_SEC, data, RTC_NR_TIME);
181	if (ret < 0) {
182	dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
183	ret);
184	goto out;
185	}
186
187	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
188
189	out:
190	mutex_unlock(&info->lock);
191	return ret;
192	}
193
194	static int max77686_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
195	{
196	struct max77686_rtc_info *info = dev_get_drvdata(dev);
197	u8 data[RTC_NR_TIME];
198	unsigned int val;
199	int i, ret;
200
201	mutex_lock(&info->lock);
202
203	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
204	if (ret < 0)
205	goto out;
206
207	ret = regmap_bulk_read(info->max77686->rtc_regmap,
208	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
209	if (ret < 0) {
210	dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
211	__func__, __LINE__, ret);
212	goto out;
213	}
214
215	max77686_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
216
217	alrm->enabled = 0;
218	for (i = 0; i < RTC_NR_TIME; i++) {
219	if (data[i] & ALARM_ENABLE_MASK) {
220	alrm->enabled = 1;
221	break;
222	}
223	}
224
225	alrm->pending = 0;
1748cbf7	226	ret = regmap_read(info->max77686->regmap, MAX77686_REG_STATUS2, &val);
fca1dd03	227	if (ret < 0) {
1748cbf7	228	dev_err(info->dev, "%s:%d fail to read status2 reg(%d)\n",
fca1dd03 JL	229	__func__, __LINE__, ret);
	230	goto out;
	231	}
	232
	233	if (val & (1 << 4)) /* RTCA1 */
	234	alrm->pending = 1;
	235
	236	out:
	237	mutex_unlock(&info->lock);
	238	return 0;
	239	}
	240
	241	static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
	242	{
	243	u8 data[RTC_NR_TIME];
	244	int ret, i;
	245	struct rtc_time tm;
	246
	247	if (!mutex_is_locked(&info->lock))
	248	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
	249
	250	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
	251	if (ret < 0)
	252	goto out;
	253
	254	ret = regmap_bulk_read(info->max77686->rtc_regmap,
	255	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	256	if (ret < 0) {
	257	dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
	258	__func__, ret);
	259	goto out;
	260	}
	261
	262	max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);
	263
	264	for (i = 0; i < RTC_NR_TIME; i++)
	265	data[i] &= ~ALARM_ENABLE_MASK;
	266
	267	ret = regmap_bulk_write(info->max77686->rtc_regmap,
	268	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
	269	if (ret < 0) {
	270	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
	271	__func__, ret);
	272	goto out;
	273	}
	274
	275	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
	276	out:
	277	return ret;
	278	}
	279
	280	static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
	281	{
	282	u8 data[RTC_NR_TIME];
	283	int ret;
	284	struct rtc_time tm;
	285
	286	if (!mutex_is_locked(&info->lock))
	287	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
	288
	289	ret = max77686_rtc_update(info, MAX77686_RTC_READ);
	290	if (ret < 0)
	291	goto out;
	292
293	ret = regmap_bulk_read(info->max77686->rtc_regmap,
294	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
295	if (ret < 0) {
296	dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
297	__func__, ret);
298	goto out;
299	}
300
301	max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);
302
303	data[RTC_SEC] \|= (1 << ALARM_ENABLE_SHIFT);
304	data[RTC_MIN] \|= (1 << ALARM_ENABLE_SHIFT);
305	data[RTC_HOUR] \|= (1 << ALARM_ENABLE_SHIFT);
306	data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
307	if (data[RTC_MONTH] & 0xf)
308	data[RTC_MONTH] \|= (1 << ALARM_ENABLE_SHIFT);
309	if (data[RTC_YEAR] & 0x7f)
310	data[RTC_YEAR] \|= (1 << ALARM_ENABLE_SHIFT);
311	if (data[RTC_DATE] & 0x1f)
312	data[RTC_DATE] \|= (1 << ALARM_ENABLE_SHIFT);
313
314	ret = regmap_bulk_write(info->max77686->rtc_regmap,
315	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
316	if (ret < 0) {
317	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
318	__func__, ret);
319	goto out;
320	}
321
322	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
323	out:
324	return ret;
325	}
326
327	static int max77686_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
328	{
329	struct max77686_rtc_info *info = dev_get_drvdata(dev);
330	u8 data[RTC_NR_TIME];
331	int ret;
332
333	ret = max77686_rtc_tm_to_data(&alrm->time, data);
334	if (ret < 0)
335	return ret;
336
337	mutex_lock(&info->lock);
338
339	ret = max77686_rtc_stop_alarm(info);
340	if (ret < 0)
341	goto out;
342
343	ret = regmap_bulk_write(info->max77686->rtc_regmap,
344	MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
345
346	if (ret < 0) {
347	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
348	__func__, ret);
349	goto out;
350	}
351
352	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
353	if (ret < 0)
354	goto out;
355
356	if (alrm->enabled)
357	ret = max77686_rtc_start_alarm(info);
358	out:
359	mutex_unlock(&info->lock);
360	return ret;
361	}
362
363	static int max77686_rtc_alarm_irq_enable(struct device *dev,
364	unsigned int enabled)
365	{
366	struct max77686_rtc_info *info = dev_get_drvdata(dev);
367	int ret;
368
369	mutex_lock(&info->lock);
370	if (enabled)
371	ret = max77686_rtc_start_alarm(info);
372	else
373	ret = max77686_rtc_stop_alarm(info);
374	mutex_unlock(&info->lock);
375
376	return ret;
377	}
378
379	static irqreturn_t max77686_rtc_alarm_irq(int irq, void *data)
380	{
381	struct max77686_rtc_info *info = data;
382
383	dev_info(info->dev, "%s:irq(%d)\n", __func__, irq);
384
385	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF \| RTC_AF);
386
387	return IRQ_HANDLED;
388	}
389
390	static const struct rtc_class_ops max77686_rtc_ops = {
391	.read_time = max77686_rtc_read_time,
392	.set_time = max77686_rtc_set_time,
393	.read_alarm = max77686_rtc_read_alarm,
394	.set_alarm = max77686_rtc_set_alarm,
395	.alarm_irq_enable = max77686_rtc_alarm_irq_enable,
396	};
397
fca1dd03 JL	398	static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
	399	{
	400	u8 data[2];
	401	int ret;
	402
	403	/* Set RTC control register : Binary mode, 24hour mdoe */
	404	data[0] = (1 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
	405	data[1] = (0 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
	406
	407	info->rtc_24hr_mode = 1;
	408
	409	ret = regmap_bulk_write(info->max77686->rtc_regmap, MAX77686_RTC_CONTROLM, data, 2);
	410	if (ret < 0) {
	411	dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
	412	__func__, ret);
	413	return ret;
	414	}
	415
	416	ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
	417	return ret;
	418	}
	419
fca1dd03 JL	420	static int max77686_rtc_probe(struct platform_device *pdev)
	421	{
	422	struct max77686_dev *max77686 = dev_get_drvdata(pdev->dev.parent);
	423	struct max77686_rtc_info *info;
6f1c1e71	424	int ret;
fca1dd03	425
3cebeb53	426	dev_info(&pdev->dev, "%s\n", __func__);
fca1dd03	427
0f64f853 JH	428	info = devm_kzalloc(&pdev->dev, sizeof(struct max77686_rtc_info),
0f64f853 JH	429	GFP_KERNEL);
fca1dd03 JL	430	if (!info)
	431	return -ENOMEM;
	432
	433	mutex_init(&info->lock);
	434	info->dev = &pdev->dev;
	435	info->max77686 = max77686;
	436	info->rtc = max77686->rtc;
6f1c1e71	437
fca1dd03 JL	438	platform_set_drvdata(pdev, info);
	439
	440	ret = max77686_rtc_init_reg(info);
	441
	442	if (ret < 0) {
	443	dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
	444	goto err_rtc;
	445	}
	446
fca1dd03 JL	447	device_init_wakeup(&pdev->dev, 1);
fca1dd03 JL	448
f56950ec JH	449	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77686-rtc",
f56950ec JH	450	&max77686_rtc_ops, THIS_MODULE);
fca1dd03 JL	451
fca1dd03 JL	452	if (IS_ERR(info->rtc_dev)) {
fca1dd03 JL	453	ret = PTR_ERR(info->rtc_dev);
	454	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
	455	if (ret == 0)
	456	ret = -EINVAL;
	457	goto err_rtc;
	458	}
6f1c1e71	459
1745d6d3 JMC	460	if (!max77686->rtc_irq_data) {
	461	ret = -EINVAL;
	462	dev_err(&pdev->dev, "%s: no RTC regmap IRQ chip\n", __func__);
	463	goto err_rtc;
	464	}
	465
6f1c1e71 JMC	466	info->virq = regmap_irq_get_virq(max77686->rtc_irq_data,
	467	MAX77686_RTCIRQ_RTCA1);
	468	if (!info->virq) {
ad819039	469	ret = -ENXIO;
fca1dd03	470	goto err_rtc;
ad819039	471	}
fca1dd03	472
6f1c1e71 JMC	473	ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL,
6f1c1e71 JMC	474	max77686_rtc_alarm_irq, 0, "rtc-alarm1", info);
ad819039	475	if (ret < 0)
fca1dd03 JL	476	dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
fca1dd03 JL	477	info->virq, ret);
fca1dd03	478
fca1dd03	479	err_rtc:
fca1dd03 JL	480	return ret;
	481	}
	482
e7f7fc73 DA	483	#ifdef CONFIG_PM_SLEEP
	484	static int max77686_rtc_suspend(struct device *dev)
	485	{
	486	if (device_may_wakeup(dev)) {
	487	struct max77686_rtc_info *info = dev_get_drvdata(dev);
	488
	489	return enable_irq_wake(info->virq);
	490	}
	491
	492	return 0;
	493	}
	494
	495	static int max77686_rtc_resume(struct device *dev)
	496	{
	497	if (device_may_wakeup(dev)) {
	498	struct max77686_rtc_info *info = dev_get_drvdata(dev);
	499
	500	return disable_irq_wake(info->virq);
	501	}
	502
	503	return 0;
	504	}
	505	#endif
	506
	507	static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
	508	max77686_rtc_suspend, max77686_rtc_resume);
	509
fca1dd03 JL	510	static const struct platform_device_id rtc_id[] = {
	511	{ "max77686-rtc", 0 },
	512	{},
	513	};
	514
	515	static struct platform_driver max77686_rtc_driver = {
	516	.driver = {
	517	.name = "max77686-rtc",
e7f7fc73	518	.pm = &max77686_rtc_pm_ops,
fca1dd03 JL	519	},
fca1dd03 JL	520	.probe = max77686_rtc_probe,
fca1dd03 JL	521	.id_table = rtc_id,
	522	};
	523
0c58ff58	524	module_platform_driver(max77686_rtc_driver);
fca1dd03 JL	525
fca1dd03 JL	526	MODULE_DESCRIPTION("Maxim MAX77686 RTC driver");
f5b1d3c5	527	MODULE_AUTHOR("Chiwoong Byun <[email protected]>");
fca1dd03	528	MODULE_LICENSE("GPL");