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

// SPDX-License-Identifier: GPL-2.0+
//
// RTC driver for Maxim MAX8997
//
// Copyright (C) 2013 Samsung Electronics Co.Ltd
//
//  based on rtc-max8998.c

#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 0;
}

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 ret;
}

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
734c5cd5 KK	1	// SPDX-License-Identifier: GPL-2.0+
	2	//
	3	// RTC driver for Maxim MAX8997
	4	//
	5	// Copyright (C) 2013 Samsung Electronics Co.Ltd
	6	//
	7	// based on rtc-max8998.c
5e0b2704	8
a737e835 JP	9	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a737e835 JP	10
5e0b2704 JL	11	#include <linux/slab.h>
	12	#include <linux/rtc.h>
	13	#include <linux/delay.h>
	14	#include <linux/mutex.h>
	15	#include <linux/module.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/mfd/max8997-private.h>
	18	#include <linux/irqdomain.h>
	19
	20	/* Module parameter for WTSR function control */
	21	static int wtsr_en = 1;
	22	module_param(wtsr_en, int, 0444);
a895d57d	23	MODULE_PARM_DESC(wtsr_en, "Watchdog Timeout & Software Reset (default=on)");
5e0b2704 JL	24	/* Module parameter for SMPL function control */
	25	static int smpl_en = 1;
	26	module_param(smpl_en, int, 0444);
	27	MODULE_PARM_DESC(smpl_en, "Sudden Momentary Power Loss (default=on)");
	28
	29	/* RTC Control Register */
	30	#define BCD_EN_SHIFT 0
	31	#define BCD_EN_MASK (1 << BCD_EN_SHIFT)
	32	#define MODEL24_SHIFT 1
	33	#define MODEL24_MASK (1 << MODEL24_SHIFT)
	34	/* RTC Update Register1 */
	35	#define RTC_UDR_SHIFT 0
	36	#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT)
	37	/* WTSR and SMPL Register */
	38	#define WTSRT_SHIFT 0
	39	#define SMPLT_SHIFT 2
	40	#define WTSR_EN_SHIFT 6
	41	#define SMPL_EN_SHIFT 7
	42	#define WTSRT_MASK (3 << WTSRT_SHIFT)
	43	#define SMPLT_MASK (3 << SMPLT_SHIFT)
	44	#define WTSR_EN_MASK (1 << WTSR_EN_SHIFT)
	45	#define SMPL_EN_MASK (1 << SMPL_EN_SHIFT)
	46	/* RTC Hour register */
	47	#define HOUR_PM_SHIFT 6
	48	#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT)
	49	/* RTC Alarm Enable */
	50	#define ALARM_ENABLE_SHIFT 7
	51	#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT)
	52
	53	enum {
	54	RTC_SEC = 0,
	55	RTC_MIN,
	56	RTC_HOUR,
	57	RTC_WEEKDAY,
	58	RTC_MONTH,
	59	RTC_YEAR,
	60	RTC_DATE,
	61	RTC_NR_TIME
	62	};
	63
	64	struct max8997_rtc_info {
	65	struct device *dev;
	66	struct max8997_dev *max8997;
	67	struct i2c_client *rtc;
	68	struct rtc_device *rtc_dev;
	69	struct mutex lock;
	70	int virq;
	71	int rtc_24hr_mode;
	72	};
	73
	74	static void max8997_rtc_data_to_tm(u8 data, struct rtc_time tm,
	75	int rtc_24hr_mode)
	76	{
	77	tm->tm_sec = data[RTC_SEC] & 0x7f;
	78	tm->tm_min = data[RTC_MIN] & 0x7f;
	79	if (rtc_24hr_mode)
	80	tm->tm_hour = data[RTC_HOUR] & 0x1f;
	81	else {
	82	tm->tm_hour = data[RTC_HOUR] & 0x0f;
	83	if (data[RTC_HOUR] & HOUR_PM_MASK)
	84	tm->tm_hour += 12;
	85	}
	86
	87	tm->tm_wday = fls(data[RTC_WEEKDAY] & 0x7f) - 1;
88	tm->tm_mday = data[RTC_DATE] & 0x1f;
89	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
90	tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;
91	tm->tm_yday = 0;
92	tm->tm_isdst = 0;
93	}
94
95	static int max8997_rtc_tm_to_data(struct rtc_time tm, u8 data)
96	{
97	data[RTC_SEC] = tm->tm_sec;
98	data[RTC_MIN] = tm->tm_min;
99	data[RTC_HOUR] = tm->tm_hour;
100	data[RTC_WEEKDAY] = 1 << tm->tm_wday;
101	data[RTC_DATE] = tm->tm_mday;
102	data[RTC_MONTH] = tm->tm_mon + 1;
f887a9de	103	data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
5e0b2704 JL	104
5e0b2704 JL	105	if (tm->tm_year < 100) {
a737e835 JP	106	pr_warn("RTC cannot handle the year %d. Assume it's 2000.\n",
a737e835 JP	107	1900 + tm->tm_year);
5e0b2704 JL	108	return -EINVAL;
	109	}
	110	return 0;
	111	}
	112
	113	static inline int max8997_rtc_set_update_reg(struct max8997_rtc_info *info)
	114	{
	115	int ret;
	116
	117	ret = max8997_write_reg(info->rtc, MAX8997_RTC_UPDATE1,
	118	RTC_UDR_MASK);
	119	if (ret < 0)
	120	dev_err(info->dev, "%s: fail to write update reg(%d)\n",
	121	__func__, ret);
	122	else {
	123	/* Minimum 16ms delay required before RTC update.
	124	* Otherwise, we may read and update based on out-of-date
	125	* value */
	126	msleep(20);
	127	}
	128
	129	return ret;
	130	}
	131
	132	static int max8997_rtc_read_time(struct device dev, struct rtc_time tm)
	133	{
	134	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	135	u8 data[RTC_NR_TIME];
	136	int ret;
	137
	138	mutex_lock(&info->lock);
	139	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
	140	mutex_unlock(&info->lock);
	141
	142	if (ret < 0) {
	143	dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,
	144	ret);
	145	return ret;
	146	}
	147
	148	max8997_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);
	149
22652ba7	150	return 0;
5e0b2704 JL	151	}
	152
	153	static int max8997_rtc_set_time(struct device dev, struct rtc_time tm)
	154	{
	155	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	156	u8 data[RTC_NR_TIME];
	157	int ret;
	158
	159	ret = max8997_rtc_tm_to_data(tm, data);
	160	if (ret < 0)
	161	return ret;
	162
	163	mutex_lock(&info->lock);
	164
	165	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
	166	if (ret < 0) {
	167	dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
	168	ret);
	169	goto out;
	170	}
	171
	172	ret = max8997_rtc_set_update_reg(info);
	173	out:
	174	mutex_unlock(&info->lock);
	175	return ret;
	176	}
	177
	178	static int max8997_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	179	{
	180	struct max8997_rtc_info *info = dev_get_drvdata(dev);
	181	u8 data[RTC_NR_TIME];
	182	u8 val;
	183	int i, ret;
	184
	185	mutex_lock(&info->lock);
	186
	187	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
	188	data);
	189	if (ret < 0) {
	190	dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
	191	__func__, __LINE__, ret);
	192	goto out;
	193	}
	194
	195	max8997_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
	196
	197	alrm->enabled = 0;
	198	for (i = 0; i < RTC_NR_TIME; i++) {
	199	if (data[i] & ALARM_ENABLE_MASK) {
	200	alrm->enabled = 1;
	201	break;
	202	}
	203	}
	204
	205	alrm->pending = 0;
	206	ret = max8997_read_reg(info->max8997->i2c, MAX8997_REG_STATUS1, &val);
	207	if (ret < 0) {
	208	dev_err(info->dev, "%s:%d fail to read status1 reg(%d)\n",
	209	__func__, __LINE__, ret);
	210	goto out;
	211	}
	212
	213	if (val & (1 << 4)) /* RTCA1 */
	214	alrm->pending = 1;
215
216	out:
217	mutex_unlock(&info->lock);
41ef3878	218	return ret;
5e0b2704 JL	219	}
	220
	221	static int max8997_rtc_stop_alarm(struct max8997_rtc_info *info)
	222	{
	223	u8 data[RTC_NR_TIME];
	224	int ret, i;
	225
	226	if (!mutex_is_locked(&info->lock))
	227	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
	228
	229	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
	230	data);
	231	if (ret < 0) {
	232	dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
	233	__func__, ret);
	234	goto out;
	235	}
	236
	237	for (i = 0; i < RTC_NR_TIME; i++)
	238	data[i] &= ~ALARM_ENABLE_MASK;
	239
	240	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
	241	data);
	242	if (ret < 0) {
	243	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
	244	__func__, ret);
	245	goto out;
	246	}
	247
	248	ret = max8997_rtc_set_update_reg(info);
	249	out:
	250	return ret;
	251	}
	252
	253	static int max8997_rtc_start_alarm(struct max8997_rtc_info *info)
	254	{
	255	u8 data[RTC_NR_TIME];
	256	int ret;
	257
	258	if (!mutex_is_locked(&info->lock))
	259	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
	260
	261	ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
	262	data);
	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	data[RTC_SEC] \|= (1 << ALARM_ENABLE_SHIFT);
	270	data[RTC_MIN] \|= (1 << ALARM_ENABLE_SHIFT);
	271	data[RTC_HOUR] \|= (1 << ALARM_ENABLE_SHIFT);
	272	data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
	273	if (data[RTC_MONTH] & 0xf)
	274	data[RTC_MONTH] \|= (1 << ALARM_ENABLE_SHIFT);
	275	if (data[RTC_YEAR] & 0x7f)
	276	data[RTC_YEAR] \|= (1 << ALARM_ENABLE_SHIFT);
	277	if (data[RTC_DATE] & 0x1f)
	278	data[RTC_DATE] \|= (1 << ALARM_ENABLE_SHIFT);
	279
	280	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
	281	data);
	282	if (ret < 0) {
283	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
284	__func__, ret);
285	goto out;
286	}
287
288	ret = max8997_rtc_set_update_reg(info);
289	out:
290	return ret;
291	}
292	static int max8997_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
293	{
294	struct max8997_rtc_info *info = dev_get_drvdata(dev);
295	u8 data[RTC_NR_TIME];
296	int ret;
297
298	ret = max8997_rtc_tm_to_data(&alrm->time, data);
299	if (ret < 0)
300	return ret;
301
302	dev_info(info->dev, "%s: %d-%02d-%02d %02d:%02d:%02d\n", __func__,
303	data[RTC_YEAR] + 2000, data[RTC_MONTH], data[RTC_DATE],
304	data[RTC_HOUR], data[RTC_MIN], data[RTC_SEC]);
305
306	mutex_lock(&info->lock);
307
308	ret = max8997_rtc_stop_alarm(info);
309	if (ret < 0)
310	goto out;
311
312	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
313	data);
314	if (ret < 0) {
315	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
316	__func__, ret);
317	goto out;
318	}
319
320	ret = max8997_rtc_set_update_reg(info);
321	if (ret < 0)
322	goto out;
323
324	if (alrm->enabled)
325	ret = max8997_rtc_start_alarm(info);
326	out:
327	mutex_unlock(&info->lock);
328	return ret;
329	}
330
331	static int max8997_rtc_alarm_irq_enable(struct device *dev,
332	unsigned int enabled)
333	{
334	struct max8997_rtc_info *info = dev_get_drvdata(dev);
335	int ret;
336
337	mutex_lock(&info->lock);
338	if (enabled)
339	ret = max8997_rtc_start_alarm(info);
340	else
341	ret = max8997_rtc_stop_alarm(info);
342	mutex_unlock(&info->lock);
343
344	return ret;
345	}
346
347	static irqreturn_t max8997_rtc_alarm_irq(int irq, void *data)
348	{
349	struct max8997_rtc_info *info = data;
350
351	dev_info(info->dev, "%s:irq(%d)\n", __func__, irq);
352
353	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF \| RTC_AF);
354
355	return IRQ_HANDLED;
356	}
357
358	static const struct rtc_class_ops max8997_rtc_ops = {
359	.read_time = max8997_rtc_read_time,
360	.set_time = max8997_rtc_set_time,
361	.read_alarm = max8997_rtc_read_alarm,
362	.set_alarm = max8997_rtc_set_alarm,
363	.alarm_irq_enable = max8997_rtc_alarm_irq_enable,
364	};
365
366	static void max8997_rtc_enable_wtsr(struct max8997_rtc_info *info, bool enable)
367	{
368	int ret;
369	u8 val, mask;
370
371	if (!wtsr_en)
372	return;
373
374	if (enable)
375	val = (1 << WTSR_EN_SHIFT) \| (3 << WTSRT_SHIFT);
376	else
377	val = 0;
378
379	mask = WTSR_EN_MASK \| WTSRT_MASK;
380
381	dev_info(info->dev, "%s: %s WTSR\n", __func__,
382	enable ? "enable" : "disable");
383
384	ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
385	if (ret < 0) {
386	dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
387	__func__, ret);
388	return;
389	}
390
391	max8997_rtc_set_update_reg(info);
392	}
393
394	static void max8997_rtc_enable_smpl(struct max8997_rtc_info *info, bool enable)
395	{
396	int ret;
397	u8 val, mask;
398
399	if (!smpl_en)
400	return;
401
402	if (enable)
403	val = (1 << SMPL_EN_SHIFT) \| (0 << SMPLT_SHIFT);
404	else
405	val = 0;
406
407	mask = SMPL_EN_MASK \| SMPLT_MASK;
408
409	dev_info(info->dev, "%s: %s SMPL\n", __func__,
410	enable ? "enable" : "disable");
411
412	ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
413	if (ret < 0) {
414	dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
415	__func__, ret);
416	return;
417	}
418
419	max8997_rtc_set_update_reg(info);
420
421	val = 0;
422	max8997_read_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, &val);
a737e835	423	pr_info("WTSR_SMPL(0x%02x)\n", val);
5e0b2704 JL	424	}
	425
	426	static int max8997_rtc_init_reg(struct max8997_rtc_info *info)
	427	{
	428	u8 data[2];
	429	int ret;
	430
	431	/* Set RTC control register : Binary mode, 24hour mdoe */
	432	data[0] = (1 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
	433	data[1] = (0 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
	434
	435	info->rtc_24hr_mode = 1;
	436
	437	ret = max8997_bulk_write(info->rtc, MAX8997_RTC_CTRLMASK, 2, data);
	438	if (ret < 0) {
	439	dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
	440	__func__, ret);
	441	return ret;
	442	}
	443
	444	ret = max8997_rtc_set_update_reg(info);
	445	return ret;
	446	}
	447
	448	static int max8997_rtc_probe(struct platform_device *pdev)
	449	{
	450	struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
	451	struct max8997_rtc_info *info;
	452	int ret, virq;
	453
	454	info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_rtc_info),
	455	GFP_KERNEL);
	456	if (!info)
	457	return -ENOMEM;
	458
	459	mutex_init(&info->lock);
	460	info->dev = &pdev->dev;
	461	info->max8997 = max8997;
	462	info->rtc = max8997->rtc;
	463
	464	platform_set_drvdata(pdev, info);
	465
	466	ret = max8997_rtc_init_reg(info);
	467
	468	if (ret < 0) {
	469	dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
	470	return ret;
	471	}
	472
	473	max8997_rtc_enable_wtsr(info, true);
	474	max8997_rtc_enable_smpl(info, true);
	475
	476	device_init_wakeup(&pdev->dev, 1);
	477
4ce903cc JH	478	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8997-rtc",
4ce903cc JH	479	&max8997_rtc_ops, THIS_MODULE);
5e0b2704 JL	480
	481	if (IS_ERR(info->rtc_dev)) {
	482	ret = PTR_ERR(info->rtc_dev);
	483	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
	484	return ret;
	485	}
	486
	487	virq = irq_create_mapping(max8997->irq_domain, MAX8997_PMICIRQ_RTCA1);
	488	if (!virq) {
	489	dev_err(&pdev->dev, "Failed to create mapping alarm IRQ\n");
406dc004	490	ret = -ENXIO;
5e0b2704 JL	491	goto err_out;
	492	}
	493	info->virq = virq;
	494
c1879fe8 JH	495	ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
c1879fe8 JH	496	max8997_rtc_alarm_irq, 0,
5e0b2704	497	"rtc-alarm0", info);
406dc004	498	if (ret < 0)
5e0b2704 JL	499	dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
5e0b2704 JL	500	info->virq, ret);
5e0b2704 JL	501
5e0b2704 JL	502	err_out:
5e0b2704 JL	503	return ret;
	504	}
	505
5e0b2704 JL	506	static void max8997_rtc_shutdown(struct platform_device *pdev)
	507	{
	508	struct max8997_rtc_info *info = platform_get_drvdata(pdev);
	509
	510	max8997_rtc_enable_wtsr(info, false);
	511	max8997_rtc_enable_smpl(info, false);
	512	}
	513
	514	static const struct platform_device_id rtc_id[] = {
	515	{ "max8997-rtc", 0 },
	516	{},
	517	};
63074cc3	518	MODULE_DEVICE_TABLE(platform, rtc_id);
5e0b2704 JL	519
	520	static struct platform_driver max8997_rtc_driver = {
	521	.driver = {
	522	.name = "max8997-rtc",
5e0b2704 JL	523	},
5e0b2704 JL	524	.probe = max8997_rtc_probe,
5e0b2704 JL	525	.shutdown = max8997_rtc_shutdown,
	526	.id_table = rtc_id,
	527	};
	528
	529	module_platform_driver(max8997_rtc_driver);
	530
	531	MODULE_DESCRIPTION("Maxim MAX8997 RTC driver");
	532	MODULE_AUTHOR("<ms925.kim@samsung.com>");
	533	MODULE_LICENSE("GPL");