[linux-2.6-block.git] / drivers / rtc / rtc-rx8010.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for the Epson RTC module RX-8010 SJ
 *
 * Copyright(C) Timesys Corporation 2015
 * Copyright(C) General Electric Company 2015
 */

#include <linux/bcd.h>
#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtc.h>

#define RX8010_SEC     0x10
#define RX8010_MIN     0x11
#define RX8010_HOUR    0x12
#define RX8010_WDAY    0x13
#define RX8010_MDAY    0x14
#define RX8010_MONTH   0x15
#define RX8010_YEAR    0x16
#define RX8010_RESV17  0x17
#define RX8010_ALMIN   0x18
#define RX8010_ALHOUR  0x19
#define RX8010_ALWDAY  0x1A
#define RX8010_TCOUNT0 0x1B
#define RX8010_TCOUNT1 0x1C
#define RX8010_EXT     0x1D
#define RX8010_FLAG    0x1E
#define RX8010_CTRL    0x1F
/* 0x20 to 0x2F are user registers */
#define RX8010_RESV30  0x30
#define RX8010_RESV31  0x31
#define RX8010_IRQ     0x32

#define RX8010_EXT_WADA  BIT(3)

#define RX8010_FLAG_VLF  BIT(1)
#define RX8010_FLAG_AF   BIT(3)
#define RX8010_FLAG_TF   BIT(4)
#define RX8010_FLAG_UF   BIT(5)

#define RX8010_CTRL_AIE  BIT(3)
#define RX8010_CTRL_UIE  BIT(5)
#define RX8010_CTRL_STOP BIT(6)
#define RX8010_CTRL_TEST BIT(7)

#define RX8010_ALARM_AE  BIT(7)

static const struct i2c_device_id rx8010_id[] = {
	{ "rx8010", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rx8010_id);

static const struct of_device_id rx8010_of_match[] = {
	{ .compatible = "epson,rx8010" },
	{ }
};
MODULE_DEVICE_TABLE(of, rx8010_of_match);

struct rx8010_data {
	struct i2c_client *client;
	struct rtc_device *rtc;
	u8 ctrlreg;
};

static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
{
	struct i2c_client *client = dev_id;
	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
	int flagreg;

	mutex_lock(&rx8010->rtc->ops_lock);

	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);

	if (flagreg <= 0) {
		mutex_unlock(&rx8010->rtc->ops_lock);
		return IRQ_NONE;
	}

	if (flagreg & RX8010_FLAG_VLF)
		dev_warn(&client->dev, "Frequency stop detected\n");

	if (flagreg & RX8010_FLAG_TF) {
		flagreg &= ~RX8010_FLAG_TF;
		rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF);
	}

	if (flagreg & RX8010_FLAG_AF) {
		flagreg &= ~RX8010_FLAG_AF;
		rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF);
	}

	if (flagreg & RX8010_FLAG_UF) {
		flagreg &= ~RX8010_FLAG_UF;
		rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF);
	}

	i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);

	mutex_unlock(&rx8010->rtc->ops_lock);
	return IRQ_HANDLED;
}

static int rx8010_get_time(struct device *dev, struct rtc_time *dt)
{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 date[7];
	int flagreg;
	int err;

	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
	if (flagreg < 0)
		return flagreg;

	if (flagreg & RX8010_FLAG_VLF) {
		dev_warn(dev, "Frequency stop detected\n");
		return -EINVAL;
	}

	err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC,
					    7, date);
	if (err != 7)
		return err < 0 ? err : -EIO;

	dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
	dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
	dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
	dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
	dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
	dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
	dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);

	return 0;
}

static int rx8010_set_time(struct device *dev, struct rtc_time *dt)
{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 date[7];
	int ctrl, flagreg;
	int ret;

	if ((dt->tm_year < 100) || (dt->tm_year > 199))
		return -EINVAL;

	/* set STOP bit before changing clock/calendar */
	ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
	if (ctrl < 0)
		return ctrl;
	rx8010->ctrlreg = ctrl | RX8010_CTRL_STOP;
	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
					rx8010->ctrlreg);
	if (ret < 0)
		return ret;

	date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
	date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
	date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
	date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
	date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
	date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
	date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);

	ret = i2c_smbus_write_i2c_block_data(rx8010->client,
					     RX8010_SEC, 7, date);
	if (ret < 0)
		return ret;

	/* clear STOP bit after changing clock/calendar */
	ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
	if (ctrl < 0)
		return ctrl;
	rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP;
	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
					rx8010->ctrlreg);
	if (ret < 0)
		return ret;

	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
	if (flagreg < 0) {
		return flagreg;
	}

	if (flagreg & RX8010_FLAG_VLF)
		ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG,
						flagreg & ~RX8010_FLAG_VLF);

	return 0;
}

static int rx8010_init_client(struct i2c_client *client)
{
	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
	u8 ctrl[2];
	int need_clear = 0, err = 0;

	/* Initialize reserved registers as specified in datasheet */
	err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08);
	if (err < 0)
		return err;

	err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00);
	if (err < 0)
		return err;

	err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG,
					    2, ctrl);
	if (err != 2)
		return err < 0 ? err : -EIO;

	if (ctrl[0] & RX8010_FLAG_VLF)
		dev_warn(&client->dev, "Frequency stop was detected\n");

	if (ctrl[0] & RX8010_FLAG_AF) {
		dev_warn(&client->dev, "Alarm was detected\n");
		need_clear = 1;
	}

	if (ctrl[0] & RX8010_FLAG_TF)
		need_clear = 1;

	if (ctrl[0] & RX8010_FLAG_UF)
		need_clear = 1;

	if (need_clear) {
		ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
		err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]);
		if (err < 0)
			return err;
	}

	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);

	return 0;
}

static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	struct i2c_client *client = rx8010->client;
	u8 alarmvals[3];
	int flagreg;
	int err;

	err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals);
	if (err != 3)
		return err < 0 ? err : -EIO;

	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
	if (flagreg < 0)
		return flagreg;

	t->time.tm_sec = 0;
	t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
	t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);

	if (!(alarmvals[2] & RX8010_ALARM_AE))
		t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);

	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;

	return 0;
}

static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 alarmvals[3];
	int extreg, flagreg;
	int err;

	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
	if (flagreg < 0) {
		return flagreg;
	}

	if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) {
		rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
		err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
						rx8010->ctrlreg);
		if (err < 0) {
			return err;
		}
	}

	flagreg &= ~RX8010_FLAG_AF;
	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
	if (err < 0)
		return err;

	alarmvals[0] = bin2bcd(t->time.tm_min);
	alarmvals[1] = bin2bcd(t->time.tm_hour);
	alarmvals[2] = bin2bcd(t->time.tm_mday);

	err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN,
					     2, alarmvals);
	if (err < 0)
		return err;

	extreg = i2c_smbus_read_byte_data(client, RX8010_EXT);
	if (extreg < 0)
		return extreg;

	extreg |= RX8010_EXT_WADA;
	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg);
	if (err < 0)
		return err;

	if (alarmvals[2] == 0)
		alarmvals[2] |= RX8010_ALARM_AE;

	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY,
					alarmvals[2]);
	if (err < 0)
		return err;

	if (t->enabled) {
		if (rx8010->rtc->uie_rtctimer.enabled)
			rx8010->ctrlreg |= RX8010_CTRL_UIE;
		if (rx8010->rtc->aie_timer.enabled)
			rx8010->ctrlreg |=
				(RX8010_CTRL_AIE | RX8010_CTRL_UIE);

		err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
						rx8010->ctrlreg);
		if (err < 0)
			return err;
	}

	return 0;
}

static int rx8010_alarm_irq_enable(struct device *dev,
				   unsigned int enabled)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	int flagreg;
	u8 ctrl;
	int err;

	ctrl = rx8010->ctrlreg;

	if (enabled) {
		if (rx8010->rtc->uie_rtctimer.enabled)
			ctrl |= RX8010_CTRL_UIE;
		if (rx8010->rtc->aie_timer.enabled)
			ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
	} else {
		if (!rx8010->rtc->uie_rtctimer.enabled)
			ctrl &= ~RX8010_CTRL_UIE;
		if (!rx8010->rtc->aie_timer.enabled)
			ctrl &= ~RX8010_CTRL_AIE;
	}

	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
	if (flagreg < 0)
		return flagreg;

	flagreg &= ~RX8010_FLAG_AF;
	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
	if (err < 0)
		return err;

	if (ctrl != rx8010->ctrlreg) {
		rx8010->ctrlreg = ctrl;
		err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
						rx8010->ctrlreg);
		if (err < 0)
			return err;
	}

	return 0;
}

static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	int tmp;
	int flagreg;

	switch (cmd) {
	case RTC_VL_READ:
		flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
		if (flagreg < 0)
			return flagreg;

		tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
		return put_user(tmp, (unsigned int __user *)arg);

	default:
		return -ENOIOCTLCMD;
	}
}

static struct rtc_class_ops rx8010_rtc_ops = {
	.read_time = rx8010_get_time,
	.set_time = rx8010_set_time,
	.ioctl = rx8010_ioctl,
};

static int rx8010_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct rx8010_data *rx8010;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
		| I2C_FUNC_SMBUS_I2C_BLOCK)) {
		dev_err(&adapter->dev, "doesn't support required functionality\n");
		return -EIO;
	}

	rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data),
			      GFP_KERNEL);
	if (!rx8010)
		return -ENOMEM;

	rx8010->client = client;
	i2c_set_clientdata(client, rx8010);

	err = rx8010_init_client(client);
	if (err)
		return err;

	if (client->irq > 0) {
		dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
		err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
						rx8010_irq_1_handler,
						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
						"rx8010", client);

		if (err) {
			dev_err(&client->dev, "unable to request IRQ\n");
			client->irq = 0;
		} else {
			rx8010_rtc_ops.read_alarm = rx8010_read_alarm;
			rx8010_rtc_ops.set_alarm = rx8010_set_alarm;
			rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable;
		}
	}

	rx8010->rtc = devm_rtc_device_register(&client->dev, client->name,
		&rx8010_rtc_ops, THIS_MODULE);

	if (IS_ERR(rx8010->rtc)) {
		dev_err(&client->dev, "unable to register the class device\n");
		return PTR_ERR(rx8010->rtc);
	}

	rx8010->rtc->max_user_freq = 1;

	return 0;
}

static struct i2c_driver rx8010_driver = {
	.driver = {
		.name = "rtc-rx8010",
		.of_match_table = of_match_ptr(rx8010_of_match),
	},
	.probe		= rx8010_probe,
	.id_table	= rx8010_id,
};

module_i2c_driver(rx8010_driver);

MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
ed13d89b AB	2	/*
	3	* Driver for the Epson RTC module RX-8010 SJ
	4	*
	5	* Copyright(C) Timesys Corporation 2015
	6	* Copyright(C) General Electric Company 2015
ed13d89b AB	7	*/
	8
	9	#include <linux/bcd.h>
	10	#include <linux/bitops.h>
	11	#include <linux/i2c.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/rtc.h>
	15
	16	#define RX8010_SEC 0x10
	17	#define RX8010_MIN 0x11
	18	#define RX8010_HOUR 0x12
	19	#define RX8010_WDAY 0x13
	20	#define RX8010_MDAY 0x14
	21	#define RX8010_MONTH 0x15
	22	#define RX8010_YEAR 0x16
ed13d89b AB	23	#define RX8010_RESV17 0x17
	24	#define RX8010_ALMIN 0x18
	25	#define RX8010_ALHOUR 0x19
	26	#define RX8010_ALWDAY 0x1A
	27	#define RX8010_TCOUNT0 0x1B
	28	#define RX8010_TCOUNT1 0x1C
	29	#define RX8010_EXT 0x1D
	30	#define RX8010_FLAG 0x1E
	31	#define RX8010_CTRL 0x1F
	32	/* 0x20 to 0x2F are user registers */
	33	#define RX8010_RESV30 0x30
abf57f73	34	#define RX8010_RESV31 0x31
ed13d89b AB	35	#define RX8010_IRQ 0x32
	36
	37	#define RX8010_EXT_WADA BIT(3)
	38
	39	#define RX8010_FLAG_VLF BIT(1)
	40	#define RX8010_FLAG_AF BIT(3)
	41	#define RX8010_FLAG_TF BIT(4)
	42	#define RX8010_FLAG_UF BIT(5)
	43
	44	#define RX8010_CTRL_AIE BIT(3)
	45	#define RX8010_CTRL_UIE BIT(5)
	46	#define RX8010_CTRL_STOP BIT(6)
	47	#define RX8010_CTRL_TEST BIT(7)
	48
	49	#define RX8010_ALARM_AE BIT(7)
	50
	51	static const struct i2c_device_id rx8010_id[] = {
	52	{ "rx8010", 0 },
	53	{ }
	54	};
	55	MODULE_DEVICE_TABLE(i2c, rx8010_id);
	56
81b779ce JMC	57	static const struct of_device_id rx8010_of_match[] = {
	58	{ .compatible = "epson,rx8010" },
	59	{ }
	60	};
	61	MODULE_DEVICE_TABLE(of, rx8010_of_match);
	62
ed13d89b AB	63	struct rx8010_data {
	64	struct i2c_client *client;
	65	struct rtc_device *rtc;
	66	u8 ctrlreg;
ed13d89b AB	67	};
	68
	69	static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
	70	{
	71	struct i2c_client *client = dev_id;
	72	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
	73	int flagreg;
	74
666b5d1e	75	mutex_lock(&rx8010->rtc->ops_lock);
ed13d89b AB	76
	77	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
	78
	79	if (flagreg <= 0) {
666b5d1e	80	mutex_unlock(&rx8010->rtc->ops_lock);
ed13d89b AB	81	return IRQ_NONE;
	82	}
	83
	84	if (flagreg & RX8010_FLAG_VLF)
	85	dev_warn(&client->dev, "Frequency stop detected\n");
	86
	87	if (flagreg & RX8010_FLAG_TF) {
	88	flagreg &= ~RX8010_FLAG_TF;
	89	rtc_update_irq(rx8010->rtc, 1, RTC_PF \| RTC_IRQF);
	90	}
	91
	92	if (flagreg & RX8010_FLAG_AF) {
	93	flagreg &= ~RX8010_FLAG_AF;
	94	rtc_update_irq(rx8010->rtc, 1, RTC_AF \| RTC_IRQF);
	95	}
	96
	97	if (flagreg & RX8010_FLAG_UF) {
	98	flagreg &= ~RX8010_FLAG_UF;
	99	rtc_update_irq(rx8010->rtc, 1, RTC_UF \| RTC_IRQF);
	100	}
	101
	102	i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
	103
666b5d1e	104	mutex_unlock(&rx8010->rtc->ops_lock);
ed13d89b AB	105	return IRQ_HANDLED;
	106	}
	107
	108	static int rx8010_get_time(struct device dev, struct rtc_time dt)
	109	{
	110	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	111	u8 date[7];
	112	int flagreg;
	113	int err;
	114
	115	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
	116	if (flagreg < 0)
	117	return flagreg;
	118
	119	if (flagreg & RX8010_FLAG_VLF) {
	120	dev_warn(dev, "Frequency stop detected\n");
	121	return -EINVAL;
	122	}
	123
	124	err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC,
	125	7, date);
	126	if (err != 7)
	127	return err < 0 ? err : -EIO;
	128
	129	dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
	130	dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
	131	dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
	132	dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
	133	dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
	134	dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
	135	dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);
	136
22652ba7	137	return 0;
ed13d89b AB	138	}
	139
	140	static int rx8010_set_time(struct device dev, struct rtc_time dt)
	141	{
	142	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	143	u8 date[7];
	144	int ctrl, flagreg;
	145	int ret;
ed13d89b AB	146
	147	if ((dt->tm_year < 100) \|\| (dt->tm_year > 199))
	148	return -EINVAL;
	149
	150	/* set STOP bit before changing clock/calendar */
	151	ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
	152	if (ctrl < 0)
	153	return ctrl;
	154	rx8010->ctrlreg = ctrl \| RX8010_CTRL_STOP;
	155	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
	156	rx8010->ctrlreg);
	157	if (ret < 0)
	158	return ret;
	159
	160	date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
	161	date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
	162	date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
	163	date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
	164	date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
	165	date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
	166	date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);
	167
	168	ret = i2c_smbus_write_i2c_block_data(rx8010->client,
	169	RX8010_SEC, 7, date);
	170	if (ret < 0)
	171	return ret;
	172
	173	/* clear STOP bit after changing clock/calendar */
	174	ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
	175	if (ctrl < 0)
	176	return ctrl;
	177	rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP;
	178	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
	179	rx8010->ctrlreg);
	180	if (ret < 0)
	181	return ret;
	182
ed13d89b AB	183	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
ed13d89b AB	184	if (flagreg < 0) {
ed13d89b AB	185	return flagreg;
	186	}
	187
	188	if (flagreg & RX8010_FLAG_VLF)
	189	ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG,
	190	flagreg & ~RX8010_FLAG_VLF);
	191
ed13d89b AB	192	return 0;
	193	}
	194
	195	static int rx8010_init_client(struct i2c_client *client)
	196	{
	197	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
	198	u8 ctrl[2];
	199	int need_clear = 0, err = 0;
	200
	201	/* Initialize reserved registers as specified in datasheet */
	202	err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8);
	203	if (err < 0)
	204	return err;
	205
	206	err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00);
	207	if (err < 0)
	208	return err;
	209
	210	err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08);
	211	if (err < 0)
	212	return err;
	213
	214	err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00);
	215	if (err < 0)
	216	return err;
	217
	218	err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG,
	219	2, ctrl);
	220	if (err != 2)
	221	return err < 0 ? err : -EIO;
	222
	223	if (ctrl[0] & RX8010_FLAG_VLF)
	224	dev_warn(&client->dev, "Frequency stop was detected\n");
	225
	226	if (ctrl[0] & RX8010_FLAG_AF) {
	227	dev_warn(&client->dev, "Alarm was detected\n");
	228	need_clear = 1;
	229	}
	230
	231	if (ctrl[0] & RX8010_FLAG_TF)
	232	need_clear = 1;
	233
	234	if (ctrl[0] & RX8010_FLAG_UF)
	235	need_clear = 1;
	236
	237	if (need_clear) {
	238	ctrl[0] &= ~(RX8010_FLAG_AF \| RX8010_FLAG_TF \| RX8010_FLAG_UF);
	239	err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]);
	240	if (err < 0)
	241	return err;
	242	}
	243
	244	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
	245
804a6cfe	246	return 0;
ed13d89b AB	247	}
	248
	249	static int rx8010_read_alarm(struct device dev, struct rtc_wkalrm t)
	250	{
	251	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	252	struct i2c_client *client = rx8010->client;
	253	u8 alarmvals[3];
	254	int flagreg;
	255	int err;
	256
	257	err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals);
	258	if (err != 3)
	259	return err < 0 ? err : -EIO;
	260
	261	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
	262	if (flagreg < 0)
	263	return flagreg;
	264
	265	t->time.tm_sec = 0;
	266	t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
	267	t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
	268
56d86a7e	269	if (!(alarmvals[2] & RX8010_ALARM_AE))
ed13d89b AB	270	t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);
ed13d89b AB	271
ed13d89b AB	272	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
	273	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
	274
804a6cfe	275	return 0;
ed13d89b AB	276	}
	277
	278	static int rx8010_set_alarm(struct device dev, struct rtc_wkalrm t)
	279	{
	280	struct i2c_client *client = to_i2c_client(dev);
	281	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	282	u8 alarmvals[3];
	283	int extreg, flagreg;
	284	int err;
ed13d89b	285
ed13d89b AB	286	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
ed13d89b AB	287	if (flagreg < 0) {
ed13d89b AB	288	return flagreg;
	289	}
	290
	291	if (rx8010->ctrlreg & (RX8010_CTRL_AIE \| RX8010_CTRL_UIE)) {
	292	rx8010->ctrlreg &= ~(RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
	293	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
	294	rx8010->ctrlreg);
	295	if (err < 0) {
ed13d89b AB	296	return err;
	297	}
	298	}
	299
	300	flagreg &= ~RX8010_FLAG_AF;
	301	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
ed13d89b AB	302	if (err < 0)
	303	return err;
	304
	305	alarmvals[0] = bin2bcd(t->time.tm_min);
	306	alarmvals[1] = bin2bcd(t->time.tm_hour);
	307	alarmvals[2] = bin2bcd(t->time.tm_mday);
	308
	309	err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN,
	310	2, alarmvals);
	311	if (err < 0)
	312	return err;
	313
	314	extreg = i2c_smbus_read_byte_data(client, RX8010_EXT);
	315	if (extreg < 0)
	316	return extreg;
	317
	318	extreg \|= RX8010_EXT_WADA;
	319	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg);
	320	if (err < 0)
	321	return err;
	322
	323	if (alarmvals[2] == 0)
	324	alarmvals[2] \|= RX8010_ALARM_AE;
	325
	326	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY,
	327	alarmvals[2]);
	328	if (err < 0)
	329	return err;
	330
	331	if (t->enabled) {
	332	if (rx8010->rtc->uie_rtctimer.enabled)
	333	rx8010->ctrlreg \|= RX8010_CTRL_UIE;
	334	if (rx8010->rtc->aie_timer.enabled)
	335	rx8010->ctrlreg \|=
	336	(RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
	337
	338	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
	339	rx8010->ctrlreg);
	340	if (err < 0)
	341	return err;
	342	}
	343
	344	return 0;
	345	}
	346
	347	static int rx8010_alarm_irq_enable(struct device *dev,
	348	unsigned int enabled)
	349	{
	350	struct i2c_client *client = to_i2c_client(dev);
	351	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	352	int flagreg;
	353	u8 ctrl;
	354	int err;
	355
	356	ctrl = rx8010->ctrlreg;
	357
	358	if (enabled) {
	359	if (rx8010->rtc->uie_rtctimer.enabled)
	360	ctrl \|= RX8010_CTRL_UIE;
	361	if (rx8010->rtc->aie_timer.enabled)
	362	ctrl \|= (RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
	363	} else {
	364	if (!rx8010->rtc->uie_rtctimer.enabled)
	365	ctrl &= ~RX8010_CTRL_UIE;
366	if (!rx8010->rtc->aie_timer.enabled)
367	ctrl &= ~RX8010_CTRL_AIE;
368	}
369
370	flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
371	if (flagreg < 0)
372	return flagreg;
373
374	flagreg &= ~RX8010_FLAG_AF;
375	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
376	if (err < 0)
377	return err;
378
379	if (ctrl != rx8010->ctrlreg) {
380	rx8010->ctrlreg = ctrl;
381	err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
382	rx8010->ctrlreg);
383	if (err < 0)
384	return err;
385	}
386
387	return 0;
388	}
389
390	static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
391	{
ed13d89b	392	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
894b0432	393	int tmp;
ed13d89b	394	int flagreg;
ed13d89b AB	395
	396	switch (cmd) {
	397	case RTC_VL_READ:
	398	flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
	399	if (flagreg < 0)
	400	return flagreg;
	401
8049c113 AB	402	tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
8049c113 AB	403	return put_user(tmp, (unsigned int __user *)arg);
ed13d89b	404
ed13d89b AB	405	default:
	406	return -ENOIOCTLCMD;
	407	}
	408	}
	409
	410	static struct rtc_class_ops rx8010_rtc_ops = {
	411	.read_time = rx8010_get_time,
	412	.set_time = rx8010_set_time,
	413	.ioctl = rx8010_ioctl,
	414	};
	415
	416	static int rx8010_probe(struct i2c_client *client,
	417	const struct i2c_device_id *id)
	418	{
9d085c54	419	struct i2c_adapter *adapter = client->adapter;
ed13d89b AB	420	struct rx8010_data *rx8010;
	421	int err = 0;
	422
	423	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
	424	\| I2C_FUNC_SMBUS_I2C_BLOCK)) {
	425	dev_err(&adapter->dev, "doesn't support required functionality\n");
	426	return -EIO;
	427	}
	428
	429	rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data),
	430	GFP_KERNEL);
	431	if (!rx8010)
	432	return -ENOMEM;
	433
	434	rx8010->client = client;
	435	i2c_set_clientdata(client, rx8010);
	436
ed13d89b AB	437	err = rx8010_init_client(client);
	438	if (err)
	439	return err;
	440
	441	if (client->irq > 0) {
	442	dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
	443	err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
	444	rx8010_irq_1_handler,
	445	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	446	"rx8010", client);
	447
	448	if (err) {
	449	dev_err(&client->dev, "unable to request IRQ\n");
	450	client->irq = 0;
	451	} else {
	452	rx8010_rtc_ops.read_alarm = rx8010_read_alarm;
	453	rx8010_rtc_ops.set_alarm = rx8010_set_alarm;
	454	rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable;
	455	}
	456	}
	457
	458	rx8010->rtc = devm_rtc_device_register(&client->dev, client->name,
	459	&rx8010_rtc_ops, THIS_MODULE);
	460
	461	if (IS_ERR(rx8010->rtc)) {
	462	dev_err(&client->dev, "unable to register the class device\n");
	463	return PTR_ERR(rx8010->rtc);
	464	}
	465
	466	rx8010->rtc->max_user_freq = 1;
	467
aeedfe7f	468	return 0;
ed13d89b AB	469	}
	470
	471	static struct i2c_driver rx8010_driver = {
	472	.driver = {
	473	.name = "rtc-rx8010",
81b779ce	474	.of_match_table = of_match_ptr(rx8010_of_match),
ed13d89b AB	475	},
	476	.probe = rx8010_probe,
	477	.id_table = rx8010_id,
	478	};
	479
	480	module_i2c_driver(rx8010_driver);
	481
	482	MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
	483	MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
	484	MODULE_LICENSE("GPL v2");