[linux-2.6-block.git] / drivers / rtc / rtc-rv8803.c

// SPDX-License-Identifier: GPL-2.0
/*
 * RTC driver for the Micro Crystal RV8803
 *
 * Copyright (C) 2015 Micro Crystal SA
 * Alexandre Belloni <alexandre.belloni@bootlin.com>
 *
 */

#include <linux/bcd.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/rtc.h>

#define RV8803_I2C_TRY_COUNT		4

#define RV8803_SEC			0x00
#define RV8803_MIN			0x01
#define RV8803_HOUR			0x02
#define RV8803_WEEK			0x03
#define RV8803_DAY			0x04
#define RV8803_MONTH			0x05
#define RV8803_YEAR			0x06
#define RV8803_RAM			0x07
#define RV8803_ALARM_MIN		0x08
#define RV8803_ALARM_HOUR		0x09
#define RV8803_ALARM_WEEK_OR_DAY	0x0A
#define RV8803_EXT			0x0D
#define RV8803_FLAG			0x0E
#define RV8803_CTRL			0x0F

#define RV8803_EXT_WADA			BIT(6)

#define RV8803_FLAG_V1F			BIT(0)
#define RV8803_FLAG_V2F			BIT(1)
#define RV8803_FLAG_AF			BIT(3)
#define RV8803_FLAG_TF			BIT(4)
#define RV8803_FLAG_UF			BIT(5)

#define RV8803_CTRL_RESET		BIT(0)

#define RV8803_CTRL_EIE			BIT(2)
#define RV8803_CTRL_AIE			BIT(3)
#define RV8803_CTRL_TIE			BIT(4)
#define RV8803_CTRL_UIE			BIT(5)

#define RX8900_BACKUP_CTRL		0x18
#define RX8900_FLAG_SWOFF		BIT(2)
#define RX8900_FLAG_VDETOFF		BIT(3)

enum rv8803_type {
	rv_8803,
	rx_8900
};

struct rv8803_data {
	struct i2c_client *client;
	struct rtc_device *rtc;
	struct mutex flags_lock;
	u8 ctrl;
	enum rv8803_type type;
};

static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
{
	int try = RV8803_I2C_TRY_COUNT;
	s32 ret;

	/*
	 * There is a 61µs window during which the RTC does not acknowledge I2C
	 * transfers. In that case, ensure that there are multiple attempts.
	 */
	do
		ret = i2c_smbus_read_byte_data(client, reg);
	while ((ret == -ENXIO || ret == -EIO) && --try);
	if (ret < 0)
		dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);

	return ret;
}

static int rv8803_read_regs(const struct i2c_client *client,
			    u8 reg, u8 count, u8 *values)
{
	int try = RV8803_I2C_TRY_COUNT;
	s32 ret;

	do
		ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);
	while ((ret == -ENXIO || ret == -EIO) && --try);
	if (ret != count) {
		dev_err(&client->dev,
			"Unable to read registers 0x%02x..0x%02x\n",
			reg, reg + count - 1);
		return ret < 0 ? ret : -EIO;
	}

	return 0;
}

static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)
{
	int try = RV8803_I2C_TRY_COUNT;
	s32 ret;

	do
		ret = i2c_smbus_write_byte_data(client, reg, value);
	while ((ret == -ENXIO || ret == -EIO) && --try);
	if (ret)
		dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);

	return ret;
}

static int rv8803_write_regs(const struct i2c_client *client,
			     u8 reg, u8 count, const u8 *values)
{
	int try = RV8803_I2C_TRY_COUNT;
	s32 ret;

	do
		ret = i2c_smbus_write_i2c_block_data(client, reg, count,
						     values);
	while ((ret == -ENXIO || ret == -EIO) && --try);
	if (ret)
		dev_err(&client->dev,
			"Unable to write registers 0x%02x..0x%02x\n",
			reg, reg + count - 1);

	return ret;
}

static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
{
	struct i2c_client *client = dev_id;
	struct rv8803_data *rv8803 = i2c_get_clientdata(client);
	unsigned long events = 0;
	int flags;

	mutex_lock(&rv8803->flags_lock);

	flags = rv8803_read_reg(client, RV8803_FLAG);
	if (flags <= 0) {
		mutex_unlock(&rv8803->flags_lock);
		return IRQ_NONE;
	}

	if (flags & RV8803_FLAG_V1F)
		dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");

	if (flags & RV8803_FLAG_V2F)
		dev_warn(&client->dev, "Voltage low, data loss detected.\n");

	if (flags & RV8803_FLAG_TF) {
		flags &= ~RV8803_FLAG_TF;
		rv8803->ctrl &= ~RV8803_CTRL_TIE;
		events |= RTC_PF;
	}

	if (flags & RV8803_FLAG_AF) {
		flags &= ~RV8803_FLAG_AF;
		rv8803->ctrl &= ~RV8803_CTRL_AIE;
		events |= RTC_AF;
	}

	if (flags & RV8803_FLAG_UF) {
		flags &= ~RV8803_FLAG_UF;
		rv8803->ctrl &= ~RV8803_CTRL_UIE;
		events |= RTC_UF;
	}

	if (events) {
		rtc_update_irq(rv8803->rtc, 1, events);
		rv8803_write_reg(client, RV8803_FLAG, flags);
		rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);
	}

	mutex_unlock(&rv8803->flags_lock);

	return IRQ_HANDLED;
}

static int rv8803_get_time(struct device *dev, struct rtc_time *tm)
{
	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	u8 date1[7];
	u8 date2[7];
	u8 *date = date1;
	int ret, flags;

	flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
	if (flags < 0)
		return flags;

	if (flags & RV8803_FLAG_V2F) {
		dev_warn(dev, "Voltage low, data is invalid.\n");
		return -EINVAL;
	}

	ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);
	if (ret)
		return ret;

	if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {
		ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);
		if (ret)
			return ret;

		if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))
			date = date2;
	}

	tm->tm_sec  = bcd2bin(date[RV8803_SEC] & 0x7f);
	tm->tm_min  = bcd2bin(date[RV8803_MIN] & 0x7f);
	tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);
	tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);
	tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);
	tm->tm_mon  = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;
	tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;

	return 0;
}

static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
{
	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	u8 date[7];
	int ctrl, flags, ret;

	ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
	if (ctrl < 0)
		return ctrl;

	/* Stop the clock */
	ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
			       ctrl | RV8803_CTRL_RESET);
	if (ret)
		return ret;

	date[RV8803_SEC]   = bin2bcd(tm->tm_sec);
	date[RV8803_MIN]   = bin2bcd(tm->tm_min);
	date[RV8803_HOUR]  = bin2bcd(tm->tm_hour);
	date[RV8803_WEEK]  = 1 << (tm->tm_wday);
	date[RV8803_DAY]   = bin2bcd(tm->tm_mday);
	date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);
	date[RV8803_YEAR]  = bin2bcd(tm->tm_year - 100);

	ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);
	if (ret)
		return ret;

	/* Restart the clock */
	ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
			       ctrl & ~RV8803_CTRL_RESET);
	if (ret)
		return ret;

	mutex_lock(&rv8803->flags_lock);

	flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
	if (flags < 0) {
		mutex_unlock(&rv8803->flags_lock);
		return flags;
	}

	ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
			       flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F));

	mutex_unlock(&rv8803->flags_lock);

	return ret;
}

static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	struct i2c_client *client = rv8803->client;
	u8 alarmvals[3];
	int flags, ret;

	ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);
	if (ret)
		return ret;

	flags = rv8803_read_reg(client, RV8803_FLAG);
	if (flags < 0)
		return flags;

	alrm->time.tm_sec  = 0;
	alrm->time.tm_min  = bcd2bin(alarmvals[0] & 0x7f);
	alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
	alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);

	alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);
	alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;

	return 0;
}

static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	u8 alarmvals[3];
	u8 ctrl[2];
	int ret, err;

	/* The alarm has no seconds, round up to nearest minute */
	if (alrm->time.tm_sec) {
		time64_t alarm_time = rtc_tm_to_time64(&alrm->time);

		alarm_time += 60 - alrm->time.tm_sec;
		rtc_time64_to_tm(alarm_time, &alrm->time);
	}

	mutex_lock(&rv8803->flags_lock);

	ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);
	if (ret) {
		mutex_unlock(&rv8803->flags_lock);
		return ret;
	}

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

	if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) {
		rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE);
		err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
				       rv8803->ctrl);
		if (err) {
			mutex_unlock(&rv8803->flags_lock);
			return err;
		}
	}

	ctrl[1] &= ~RV8803_FLAG_AF;
	err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]);
	mutex_unlock(&rv8803->flags_lock);
	if (err)
		return err;

	err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);
	if (err)
		return err;

	if (alrm->enabled) {
		if (rv8803->rtc->uie_rtctimer.enabled)
			rv8803->ctrl |= RV8803_CTRL_UIE;
		if (rv8803->rtc->aie_timer.enabled)
			rv8803->ctrl |= RV8803_CTRL_AIE;

		err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
				       rv8803->ctrl);
		if (err)
			return err;
	}

	return 0;
}

static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	int ctrl, flags, err;

	ctrl = rv8803->ctrl;

	if (enabled) {
		if (rv8803->rtc->uie_rtctimer.enabled)
			ctrl |= RV8803_CTRL_UIE;
		if (rv8803->rtc->aie_timer.enabled)
			ctrl |= RV8803_CTRL_AIE;
	} else {
		if (!rv8803->rtc->uie_rtctimer.enabled)
			ctrl &= ~RV8803_CTRL_UIE;
		if (!rv8803->rtc->aie_timer.enabled)
			ctrl &= ~RV8803_CTRL_AIE;
	}

	mutex_lock(&rv8803->flags_lock);
	flags = rv8803_read_reg(client, RV8803_FLAG);
	if (flags < 0) {
		mutex_unlock(&rv8803->flags_lock);
		return flags;
	}
	flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF);
	err = rv8803_write_reg(client, RV8803_FLAG, flags);
	mutex_unlock(&rv8803->flags_lock);
	if (err)
		return err;

	if (ctrl != rv8803->ctrl) {
		rv8803->ctrl = ctrl;
		err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);
		if (err)
			return err;
	}

	return 0;
}

static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	unsigned int vl = 0;
	int flags, ret = 0;

	switch (cmd) {
	case RTC_VL_READ:
		flags = rv8803_read_reg(client, RV8803_FLAG);
		if (flags < 0)
			return flags;

		if (flags & RV8803_FLAG_V1F) {
			dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
			vl = RTC_VL_ACCURACY_LOW;
		}

		if (flags & RV8803_FLAG_V2F)
			vl |= RTC_VL_DATA_INVALID;

		return put_user(vl, (unsigned int __user *)arg);

	case RTC_VL_CLR:
		mutex_lock(&rv8803->flags_lock);
		flags = rv8803_read_reg(client, RV8803_FLAG);
		if (flags < 0) {
			mutex_unlock(&rv8803->flags_lock);
			return flags;
		}

		flags &= ~RV8803_FLAG_V1F;
		ret = rv8803_write_reg(client, RV8803_FLAG, flags);
		mutex_unlock(&rv8803->flags_lock);
		if (ret)
			return ret;

		return 0;

	default:
		return -ENOIOCTLCMD;
	}
}

static int rv8803_nvram_write(void *priv, unsigned int offset, void *val,
			      size_t bytes)
{
	return rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
}

static int rv8803_nvram_read(void *priv, unsigned int offset,
			     void *val, size_t bytes)
{
	int ret;

	ret = rv8803_read_reg(priv, RV8803_RAM);
	if (ret < 0)
		return ret;

	*(u8 *)val = ret;

	return 0;
}

static struct rtc_class_ops rv8803_rtc_ops = {
	.read_time = rv8803_get_time,
	.set_time = rv8803_set_time,
	.ioctl = rv8803_ioctl,
};

static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
{
	struct i2c_client *client = rv8803->client;
	struct device_node *node = client->dev.of_node;
	int err;
	u8 flags;

	if (!node)
		return 0;

	if (rv8803->type != rx_8900)
		return 0;

	err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
	if (err < 0)
		return err;

	flags = ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF) & (u8)err;

	if (of_property_read_bool(node, "epson,vdet-disable"))
		flags |= RX8900_FLAG_VDETOFF;

	if (of_property_read_bool(node, "trickle-diode-disable"))
		flags |= RX8900_FLAG_SWOFF;

	return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
					 flags);
}

static int rv8803_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct rv8803_data *rv8803;
	int err, flags;
	struct nvmem_config nvmem_cfg = {
		.name = "rv8803_nvram",
		.word_size = 1,
		.stride = 1,
		.size = 1,
		.reg_read = rv8803_nvram_read,
		.reg_write = rv8803_nvram_write,
		.priv = client,
	};

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

	rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data),
			      GFP_KERNEL);
	if (!rv8803)
		return -ENOMEM;

	mutex_init(&rv8803->flags_lock);
	rv8803->client = client;
	if (client->dev.of_node)
		rv8803->type = (enum rv8803_type)
			of_device_get_match_data(&client->dev);
	else
		rv8803->type = id->driver_data;
	i2c_set_clientdata(client, rv8803);

	flags = rv8803_read_reg(client, RV8803_FLAG);
	if (flags < 0)
		return flags;

	if (flags & RV8803_FLAG_V1F)
		dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");

	if (flags & RV8803_FLAG_V2F)
		dev_warn(&client->dev, "Voltage low, data loss detected.\n");

	if (flags & RV8803_FLAG_AF)
		dev_warn(&client->dev, "An alarm maybe have been missed.\n");

	rv8803->rtc = devm_rtc_allocate_device(&client->dev);
	if (IS_ERR(rv8803->rtc))
		return PTR_ERR(rv8803->rtc);

	if (client->irq > 0) {
		err = devm_request_threaded_irq(&client->dev, client->irq,
						NULL, rv8803_handle_irq,
						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
						"rv8803", client);
		if (err) {
			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
			client->irq = 0;
		} else {
			rv8803_rtc_ops.read_alarm = rv8803_get_alarm;
			rv8803_rtc_ops.set_alarm = rv8803_set_alarm;
			rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable;
		}
	}

	err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
	if (err)
		return err;

	err = rx8900_trickle_charger_init(rv8803);
	if (err) {
		dev_err(&client->dev, "failed to init charger\n");
		return err;
	}

	rv8803->rtc->ops = &rv8803_rtc_ops;
	rv8803->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	rv8803->rtc->range_max = RTC_TIMESTAMP_END_2099;
	err = devm_rtc_register_device(rv8803->rtc);
	if (err)
		return err;

	devm_rtc_nvmem_register(rv8803->rtc, &nvmem_cfg);

	rv8803->rtc->max_user_freq = 1;

	return 0;
}

static const struct i2c_device_id rv8803_id[] = {
	{ "rv8803", rv_8803 },
	{ "rx8803", rv_8803 },
	{ "rx8900", rx_8900 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rv8803_id);

static const struct of_device_id rv8803_of_match[] = {
	{
		.compatible = "microcrystal,rv8803",
		.data = (void *)rv_8803
	},
	{
		.compatible = "epson,rx8803",
		.data = (void *)rv_8803
	},
	{
		.compatible = "epson,rx8900",
		.data = (void *)rx_8900
	},
	{ }
};
MODULE_DEVICE_TABLE(of, rv8803_of_match);

static struct i2c_driver rv8803_driver = {
	.driver = {
		.name = "rtc-rv8803",
		.of_match_table = of_match_ptr(rv8803_of_match),
	},
	.probe		= rv8803_probe,
	.id_table	= rv8803_id,
};
module_i2c_driver(rv8803_driver);

MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
182ae2bb	1	// SPDX-License-Identifier: GPL-2.0
1e3929ef AB	2	/*
	3	* RTC driver for the Micro Crystal RV8803
	4	*
	5	* Copyright (C) 2015 Micro Crystal SA
7d1e5bfe	6	* Alexandre Belloni <alexandre.belloni@bootlin.com>
1e3929ef	7	*
1e3929ef AB	8	*/
	9
	10	#include <linux/bcd.h>
	11	#include <linux/bitops.h>
a1e98e09	12	#include <linux/log2.h>
1e3929ef AB	13	#include <linux/i2c.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
740ad8f4	17	#include <linux/of_device.h>
1e3929ef AB	18	#include <linux/rtc.h>
1e3929ef AB	19
d522649e BT	20	#define RV8803_I2C_TRY_COUNT 4
d522649e BT	21
1e3929ef AB	22	#define RV8803_SEC 0x00
	23	#define RV8803_MIN 0x01
	24	#define RV8803_HOUR 0x02
	25	#define RV8803_WEEK 0x03
	26	#define RV8803_DAY 0x04
	27	#define RV8803_MONTH 0x05
	28	#define RV8803_YEAR 0x06
	29	#define RV8803_RAM 0x07
	30	#define RV8803_ALARM_MIN 0x08
	31	#define RV8803_ALARM_HOUR 0x09
	32	#define RV8803_ALARM_WEEK_OR_DAY 0x0A
	33	#define RV8803_EXT 0x0D
	34	#define RV8803_FLAG 0x0E
	35	#define RV8803_CTRL 0x0F
	36
	37	#define RV8803_EXT_WADA BIT(6)
	38
	39	#define RV8803_FLAG_V1F BIT(0)
	40	#define RV8803_FLAG_V2F BIT(1)
	41	#define RV8803_FLAG_AF BIT(3)
	42	#define RV8803_FLAG_TF BIT(4)
	43	#define RV8803_FLAG_UF BIT(5)
	44
	45	#define RV8803_CTRL_RESET BIT(0)
	46
	47	#define RV8803_CTRL_EIE BIT(2)
	48	#define RV8803_CTRL_AIE BIT(3)
	49	#define RV8803_CTRL_TIE BIT(4)
	50	#define RV8803_CTRL_UIE BIT(5)
	51
1cd71376 OR	52	#define RX8900_BACKUP_CTRL 0x18
	53	#define RX8900_FLAG_SWOFF BIT(2)
	54	#define RX8900_FLAG_VDETOFF BIT(3)
	55
	56	enum rv8803_type {
	57	rv_8803,
	58	rx_8900
	59	};
	60
1e3929ef AB	61	struct rv8803_data {
	62	struct i2c_client *client;
	63	struct rtc_device *rtc;
9d1fa4c3	64	struct mutex flags_lock;
1e3929ef	65	u8 ctrl;
1cd71376	66	enum rv8803_type type;
1e3929ef AB	67	};
1e3929ef AB	68
d522649e BT	69	static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
	70	{
	71	int try = RV8803_I2C_TRY_COUNT;
	72	s32 ret;
	73
	74	/*
	75	* There is a 61µs window during which the RTC does not acknowledge I2C
	76	* transfers. In that case, ensure that there are multiple attempts.
	77	*/
	78	do
	79	ret = i2c_smbus_read_byte_data(client, reg);
	80	while ((ret == -ENXIO \|\| ret == -EIO) && --try);
	81	if (ret < 0)
	82	dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);
	83
	84	return ret;
	85	}
	86
	87	static int rv8803_read_regs(const struct i2c_client *client,
	88	u8 reg, u8 count, u8 *values)
	89	{
	90	int try = RV8803_I2C_TRY_COUNT;
	91	s32 ret;
	92
	93	do
	94	ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);
	95	while ((ret == -ENXIO \|\| ret == -EIO) && --try);
	96	if (ret != count) {
	97	dev_err(&client->dev,
	98	"Unable to read registers 0x%02x..0x%02x\n",
	99	reg, reg + count - 1);
	100	return ret < 0 ? ret : -EIO;
	101	}
	102
	103	return 0;
	104	}
	105
	106	static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)
	107	{
	108	int try = RV8803_I2C_TRY_COUNT;
	109	s32 ret;
	110
	111	do
	112	ret = i2c_smbus_write_byte_data(client, reg, value);
	113	while ((ret == -ENXIO \|\| ret == -EIO) && --try);
	114	if (ret)
	115	dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);
	116
	117	return ret;
	118	}
	119
	120	static int rv8803_write_regs(const struct i2c_client *client,
	121	u8 reg, u8 count, const u8 *values)
	122	{
	123	int try = RV8803_I2C_TRY_COUNT;
	124	s32 ret;
	125
	126	do
	127	ret = i2c_smbus_write_i2c_block_data(client, reg, count,
	128	values);
	129	while ((ret == -ENXIO \|\| ret == -EIO) && --try);
	130	if (ret)
	131	dev_err(&client->dev,
	132	"Unable to write registers 0x%02x..0x%02x\n",
133	reg, reg + count - 1);
134
135	return ret;
136	}
137
1e3929ef AB	138	static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
	139	{
	140	struct i2c_client *client = dev_id;
	141	struct rv8803_data *rv8803 = i2c_get_clientdata(client);
	142	unsigned long events = 0;
d522649e	143	int flags;
1e3929ef	144
9d1fa4c3	145	mutex_lock(&rv8803->flags_lock);
1e3929ef	146
d522649e	147	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef	148	if (flags <= 0) {
9d1fa4c3	149	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	150	return IRQ_NONE;
	151	}
	152
	153	if (flags & RV8803_FLAG_V1F)
	154	dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
	155
	156	if (flags & RV8803_FLAG_V2F)
	157	dev_warn(&client->dev, "Voltage low, data loss detected.\n");
	158
	159	if (flags & RV8803_FLAG_TF) {
	160	flags &= ~RV8803_FLAG_TF;
	161	rv8803->ctrl &= ~RV8803_CTRL_TIE;
	162	events \|= RTC_PF;
	163	}
	164
	165	if (flags & RV8803_FLAG_AF) {
	166	flags &= ~RV8803_FLAG_AF;
	167	rv8803->ctrl &= ~RV8803_CTRL_AIE;
	168	events \|= RTC_AF;
	169	}
	170
	171	if (flags & RV8803_FLAG_UF) {
	172	flags &= ~RV8803_FLAG_UF;
	173	rv8803->ctrl &= ~RV8803_CTRL_UIE;
	174	events \|= RTC_UF;
	175	}
	176
	177	if (events) {
	178	rtc_update_irq(rv8803->rtc, 1, events);
d522649e BT	179	rv8803_write_reg(client, RV8803_FLAG, flags);
d522649e BT	180	rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);
1e3929ef AB	181	}
1e3929ef AB	182
9d1fa4c3	183	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	184
	185	return IRQ_HANDLED;
	186	}
	187
	188	static int rv8803_get_time(struct device dev, struct rtc_time tm)
	189	{
	190	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	191	u8 date1[7];
	192	u8 date2[7];
	193	u8 *date = date1;
	194	int ret, flags;
	195
d522649e	196	flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
1e3929ef AB	197	if (flags < 0)
	198	return flags;
	199
	200	if (flags & RV8803_FLAG_V2F) {
	201	dev_warn(dev, "Voltage low, data is invalid.\n");
	202	return -EINVAL;
	203	}
	204
d522649e BT	205	ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);
	206	if (ret)
	207	return ret;
1e3929ef AB	208
1e3929ef AB	209	if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {
d522649e BT	210	ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);
	211	if (ret)
	212	return ret;
1e3929ef AB	213
	214	if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))
	215	date = date2;
	216	}
	217
	218	tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f);
	219	tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f);
	220	tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);
a1e98e09	221	tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);
1e3929ef AB	222	tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);
	223	tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;
	224	tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;
	225
96acb25c	226	return 0;
1e3929ef AB	227	}
	228
	229	static int rv8803_set_time(struct device dev, struct rtc_time tm)
	230	{
	231	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	232	u8 date[7];
d3700b6b	233	int ctrl, flags, ret;
1e3929ef	234
d3700b6b BT	235	ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
	236	if (ctrl < 0)
	237	return ctrl;
	238
	239	/* Stop the clock */
	240	ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
	241	ctrl \| RV8803_CTRL_RESET);
	242	if (ret)
	243	return ret;
	244
1e3929ef AB	245	date[RV8803_SEC] = bin2bcd(tm->tm_sec);
	246	date[RV8803_MIN] = bin2bcd(tm->tm_min);
	247	date[RV8803_HOUR] = bin2bcd(tm->tm_hour);
	248	date[RV8803_WEEK] = 1 << (tm->tm_wday);
	249	date[RV8803_DAY] = bin2bcd(tm->tm_mday);
	250	date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);
	251	date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100);
	252
d522649e BT	253	ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);
d522649e BT	254	if (ret)
1e3929ef AB	255	return ret;
1e3929ef AB	256
d3700b6b BT	257	/* Restart the clock */
	258	ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
	259	ctrl & ~RV8803_CTRL_RESET);
	260	if (ret)
	261	return ret;
	262
9d1fa4c3	263	mutex_lock(&rv8803->flags_lock);
1e3929ef	264
d522649e	265	flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
1e3929ef	266	if (flags < 0) {
9d1fa4c3	267	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	268	return flags;
	269	}
	270
d522649e	271	ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
6f367788	272	flags & ~(RV8803_FLAG_V1F \| RV8803_FLAG_V2F));
1e3929ef	273
9d1fa4c3	274	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	275
	276	return ret;
	277	}
	278
	279	static int rv8803_get_alarm(struct device dev, struct rtc_wkalrm alrm)
	280	{
	281	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	282	struct i2c_client *client = rv8803->client;
	283	u8 alarmvals[3];
	284	int flags, ret;
	285
d522649e BT	286	ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);
	287	if (ret)
	288	return ret;
1e3929ef	289
d522649e	290	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef AB	291	if (flags < 0)
	292	return flags;
	293
	294	alrm->time.tm_sec = 0;
	295	alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
	296	alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
1e3929ef	297	alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
1e3929ef AB	298
	299	alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);
	300	alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;
	301
	302	return 0;
	303	}
	304
	305	static int rv8803_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	306	{
	307	struct i2c_client *client = to_i2c_client(dev);
	308	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	309	u8 alarmvals[3];
	310	u8 ctrl[2];
	311	int ret, err;
1e3929ef AB	312
	313	/* The alarm has no seconds, round up to nearest minute */
	314	if (alrm->time.tm_sec) {
	315	time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
	316
	317	alarm_time += 60 - alrm->time.tm_sec;
	318	rtc_time64_to_tm(alarm_time, &alrm->time);
	319	}
	320
9d1fa4c3	321	mutex_lock(&rv8803->flags_lock);
1e3929ef	322
d522649e BT	323	ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);
d522649e BT	324	if (ret) {
9d1fa4c3	325	mutex_unlock(&rv8803->flags_lock);
d522649e	326	return ret;
1e3929ef AB	327	}
	328
	329	alarmvals[0] = bin2bcd(alrm->time.tm_min);
	330	alarmvals[1] = bin2bcd(alrm->time.tm_hour);
	331	alarmvals[2] = bin2bcd(alrm->time.tm_mday);
	332
	333	if (rv8803->ctrl & (RV8803_CTRL_AIE \| RV8803_CTRL_UIE)) {
	334	rv8803->ctrl &= ~(RV8803_CTRL_AIE \| RV8803_CTRL_UIE);
d522649e BT	335	err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
d522649e BT	336	rv8803->ctrl);
1e3929ef	337	if (err) {
9d1fa4c3	338	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	339	return err;
	340	}
	341	}
	342
	343	ctrl[1] &= ~RV8803_FLAG_AF;
d522649e	344	err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]);
9d1fa4c3	345	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	346	if (err)
	347	return err;
	348
d522649e	349	err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);
1e3929ef AB	350	if (err)
	351	return err;
	352
	353	if (alrm->enabled) {
	354	if (rv8803->rtc->uie_rtctimer.enabled)
	355	rv8803->ctrl \|= RV8803_CTRL_UIE;
	356	if (rv8803->rtc->aie_timer.enabled)
	357	rv8803->ctrl \|= RV8803_CTRL_AIE;
	358
d522649e BT	359	err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
d522649e BT	360	rv8803->ctrl);
1e3929ef AB	361	if (err)
	362	return err;
	363	}
	364
	365	return 0;
	366	}
	367
	368	static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)
	369	{
	370	struct i2c_client *client = to_i2c_client(dev);
	371	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	372	int ctrl, flags, err;
1e3929ef AB	373
	374	ctrl = rv8803->ctrl;
	375
	376	if (enabled) {
	377	if (rv8803->rtc->uie_rtctimer.enabled)
	378	ctrl \|= RV8803_CTRL_UIE;
	379	if (rv8803->rtc->aie_timer.enabled)
	380	ctrl \|= RV8803_CTRL_AIE;
	381	} else {
	382	if (!rv8803->rtc->uie_rtctimer.enabled)
	383	ctrl &= ~RV8803_CTRL_UIE;
	384	if (!rv8803->rtc->aie_timer.enabled)
	385	ctrl &= ~RV8803_CTRL_AIE;
	386	}
	387
9d1fa4c3	388	mutex_lock(&rv8803->flags_lock);
d522649e	389	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef	390	if (flags < 0) {
9d1fa4c3	391	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	392	return flags;
	393	}
	394	flags &= ~(RV8803_FLAG_AF \| RV8803_FLAG_UF);
d522649e	395	err = rv8803_write_reg(client, RV8803_FLAG, flags);
9d1fa4c3	396	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	397	if (err)
	398	return err;
	399
	400	if (ctrl != rv8803->ctrl) {
	401	rv8803->ctrl = ctrl;
d522649e	402	err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);
1e3929ef AB	403	if (err)
	404	return err;
	405	}
	406
	407	return 0;
	408	}
	409
	410	static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	411	{
	412	struct i2c_client *client = to_i2c_client(dev);
	413	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
bcd17c50	414	unsigned int vl = 0;
1e3929ef	415	int flags, ret = 0;
1e3929ef AB	416
	417	switch (cmd) {
	418	case RTC_VL_READ:
d522649e	419	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef AB	420	if (flags < 0)
	421	return flags;
	422
bcd17c50	423	if (flags & RV8803_FLAG_V1F) {
1e3929ef	424	dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
bcd17c50 AB	425	vl = RTC_VL_ACCURACY_LOW;
bcd17c50 AB	426	}
1e3929ef AB	427
1e3929ef AB	428	if (flags & RV8803_FLAG_V2F)
bcd17c50	429	vl \|= RTC_VL_DATA_INVALID;
1e3929ef	430
bcd17c50	431	return put_user(vl, (unsigned int __user *)arg);
1e3929ef AB	432
1e3929ef AB	433	case RTC_VL_CLR:
9d1fa4c3	434	mutex_lock(&rv8803->flags_lock);
d522649e	435	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef	436	if (flags < 0) {
9d1fa4c3	437	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	438	return flags;
	439	}
	440
7e890a0f	441	flags &= ~RV8803_FLAG_V1F;
d522649e	442	ret = rv8803_write_reg(client, RV8803_FLAG, flags);
9d1fa4c3	443	mutex_unlock(&rv8803->flags_lock);
d522649e	444	if (ret)
1e3929ef AB	445	return ret;
	446
	447	return 0;
	448
	449	default:
	450	return -ENOIOCTLCMD;
	451	}
	452	}
	453
16d70a78 AB	454	static int rv8803_nvram_write(void priv, unsigned int offset, void val,
16d70a78 AB	455	size_t bytes)
1e3929ef	456	{
179b4bcc	457	return rv8803_write_reg(priv, RV8803_RAM, (u8 )val);
1e3929ef AB	458	}
1e3929ef AB	459
16d70a78 AB	460	static int rv8803_nvram_read(void *priv, unsigned int offset,
16d70a78 AB	461	void *val, size_t bytes)
1e3929ef	462	{
1e3929ef AB	463	int ret;
1e3929ef AB	464
16d70a78	465	ret = rv8803_read_reg(priv, RV8803_RAM);
1e3929ef AB	466	if (ret < 0)
	467	return ret;
	468
16d70a78	469	(u8 )val = ret;
1e3929ef	470
16d70a78	471	return 0;
1e3929ef AB	472	}
1e3929ef AB	473
1e3929ef AB	474	static struct rtc_class_ops rv8803_rtc_ops = {
	475	.read_time = rv8803_get_time,
	476	.set_time = rv8803_set_time,
	477	.ioctl = rv8803_ioctl,
	478	};
	479
1cd71376 OR	480	static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
	481	{
	482	struct i2c_client *client = rv8803->client;
	483	struct device_node *node = client->dev.of_node;
	484	int err;
	485	u8 flags;
	486
	487	if (!node)
	488	return 0;
	489
	490	if (rv8803->type != rx_8900)
	491	return 0;
	492
	493	err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
	494	if (err < 0)
	495	return err;
	496
	497	flags = ~(RX8900_FLAG_VDETOFF \| RX8900_FLAG_SWOFF) & (u8)err;
	498
	499	if (of_property_read_bool(node, "epson,vdet-disable"))
	500	flags \|= RX8900_FLAG_VDETOFF;
	501
	502	if (of_property_read_bool(node, "trickle-diode-disable"))
	503	flags \|= RX8900_FLAG_SWOFF;
	504
	505	return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
	506	flags);
	507	}
	508
1e3929ef AB	509	static int rv8803_probe(struct i2c_client *client,
	510	const struct i2c_device_id *id)
	511	{
5cb17269	512	struct i2c_adapter *adapter = client->adapter;
1e3929ef	513	struct rv8803_data *rv8803;
d522649e	514	int err, flags;
c07fd9de AB	515	struct nvmem_config nvmem_cfg = {
	516	.name = "rv8803_nvram",
	517	.word_size = 1,
	518	.stride = 1,
	519	.size = 1,
	520	.reg_read = rv8803_nvram_read,
	521	.reg_write = rv8803_nvram_write,
	522	.priv = client,
	523	};
1e3929ef AB	524
	525	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
	526	I2C_FUNC_SMBUS_I2C_BLOCK)) {
	527	dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_I2C_BLOCK\n");
	528	return -EIO;
	529	}
	530
	531	rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data),
	532	GFP_KERNEL);
	533	if (!rv8803)
	534	return -ENOMEM;
	535
9d1fa4c3	536	mutex_init(&rv8803->flags_lock);
1e3929ef	537	rv8803->client = client;
740ad8f4 JMC	538	if (client->dev.of_node)
	539	rv8803->type = (enum rv8803_type)
	540	of_device_get_match_data(&client->dev);
	541	else
	542	rv8803->type = id->driver_data;
1e3929ef AB	543	i2c_set_clientdata(client, rv8803);
1e3929ef AB	544
d522649e	545	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef AB	546	if (flags < 0)
	547	return flags;
	548
	549	if (flags & RV8803_FLAG_V1F)
	550	dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
	551
	552	if (flags & RV8803_FLAG_V2F)
	553	dev_warn(&client->dev, "Voltage low, data loss detected.\n");
	554
	555	if (flags & RV8803_FLAG_AF)
	556	dev_warn(&client->dev, "An alarm maybe have been missed.\n");
	557
7133eca1	558	rv8803->rtc = devm_rtc_allocate_device(&client->dev);
44c638ce	559	if (IS_ERR(rv8803->rtc))
7133eca1	560	return PTR_ERR(rv8803->rtc);
7133eca1	561
1e3929ef AB	562	if (client->irq > 0) {
	563	err = devm_request_threaded_irq(&client->dev, client->irq,
	564	NULL, rv8803_handle_irq,
	565	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	566	"rv8803", client);
	567	if (err) {
	568	dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
	569	client->irq = 0;
	570	} else {
	571	rv8803_rtc_ops.read_alarm = rv8803_get_alarm;
	572	rv8803_rtc_ops.set_alarm = rv8803_set_alarm;
	573	rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable;
	574	}
	575	}
	576
d522649e	577	err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
1e3929ef AB	578	if (err)
	579	return err;
	580
1cd71376 OR	581	err = rx8900_trickle_charger_init(rv8803);
	582	if (err) {
	583	dev_err(&client->dev, "failed to init charger\n");
	584	return err;
	585	}
	586
ce1ae8eb	587	rv8803->rtc->ops = &rv8803_rtc_ops;
2e17f8b9 AB	588	rv8803->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
2e17f8b9 AB	589	rv8803->rtc->range_max = RTC_TIMESTAMP_END_2099;
fdcfd854	590	err = devm_rtc_register_device(rv8803->rtc);
ce1ae8eb AB	591	if (err)
	592	return err;
	593
3a905c2d	594	devm_rtc_nvmem_register(rv8803->rtc, &nvmem_cfg);
ce1ae8eb	595
1e3929ef AB	596	rv8803->rtc->max_user_freq = 1;
	597
	598	return 0;
	599	}
	600
1e3929ef	601	static const struct i2c_device_id rv8803_id[] = {
1cd71376	602	{ "rv8803", rv_8803 },
ac771ed7	603	{ "rx8803", rv_8803 },
1cd71376	604	{ "rx8900", rx_8900 },
1e3929ef AB	605	{ }
	606	};
	607	MODULE_DEVICE_TABLE(i2c, rv8803_id);
	608
740ad8f4 JMC	609	static const struct of_device_id rv8803_of_match[] = {
	610	{
	611	.compatible = "microcrystal,rv8803",
c856618d	612	.data = (void *)rv_8803
740ad8f4	613	},
ac771ed7 AB	614	{
	615	.compatible = "epson,rx8803",
	616	.data = (void *)rv_8803
	617	},
740ad8f4 JMC	618	{
	619	.compatible = "epson,rx8900",
	620	.data = (void *)rx_8900
	621	},
	622	{ }
	623	};
	624	MODULE_DEVICE_TABLE(of, rv8803_of_match);
	625
1e3929ef AB	626	static struct i2c_driver rv8803_driver = {
	627	.driver = {
	628	.name = "rtc-rv8803",
740ad8f4	629	.of_match_table = of_match_ptr(rv8803_of_match),
1e3929ef AB	630	},
1e3929ef AB	631	.probe = rv8803_probe,
1e3929ef AB	632	.id_table = rv8803_id,
	633	};
	634	module_i2c_driver(rv8803_driver);
	635
7d1e5bfe	636	MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
1e3929ef AB	637	MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
1e3929ef AB	638	MODULE_LICENSE("GPL v2");