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

/*
 * RTC driver for the Micro Crystal RV8803
 *
 * Copyright (C) 2015 Micro Crystal SA
 *
 * Alexandre Belloni <alexandre.belloni@free-electrons.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#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;

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

	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);
	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");

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

		flags &= RV8803_FLAG_V1F | RV8803_FLAG_V2F;

		if (copy_to_user((void __user *)arg, &flags, sizeof(int)))
			return -EFAULT;

		return 0;

	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 | RV8803_FLAG_V2F);
		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)
{
	int ret;

	ret = rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
	if (ret)
		return ret;

	return 0;
}

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 = to_i2c_adapter(client->dev.parent);
	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->nvram_old_abi = true;
	err = rtc_register_device(rv8803->rtc);
	if (err)
		return err;

	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 },
	{ "rx8900", rx_8900 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rv8803_id);

static const struct of_device_id rv8803_of_match[] = {
	{
		.compatible = "microcrystal,rv8803",
		.data = (void *)rx_8900
	},
	{
		.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@free-electrons.com>");
MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1e3929ef AB	1	/*
	2	* RTC driver for the Micro Crystal RV8803
	3	*
	4	* Copyright (C) 2015 Micro Crystal SA
	5	*
	6	* Alexandre Belloni <alexandre.belloni@free-electrons.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/bcd.h>
	15	#include <linux/bitops.h>
a1e98e09	16	#include <linux/log2.h>
1e3929ef AB	17	#include <linux/i2c.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
740ad8f4	21	#include <linux/of_device.h>
1e3929ef AB	22	#include <linux/rtc.h>
1e3929ef AB	23
d522649e BT	24	#define RV8803_I2C_TRY_COUNT 4
d522649e BT	25
1e3929ef AB	26	#define RV8803_SEC 0x00
	27	#define RV8803_MIN 0x01
	28	#define RV8803_HOUR 0x02
	29	#define RV8803_WEEK 0x03
	30	#define RV8803_DAY 0x04
	31	#define RV8803_MONTH 0x05
	32	#define RV8803_YEAR 0x06
	33	#define RV8803_RAM 0x07
	34	#define RV8803_ALARM_MIN 0x08
	35	#define RV8803_ALARM_HOUR 0x09
	36	#define RV8803_ALARM_WEEK_OR_DAY 0x0A
	37	#define RV8803_EXT 0x0D
	38	#define RV8803_FLAG 0x0E
	39	#define RV8803_CTRL 0x0F
	40
	41	#define RV8803_EXT_WADA BIT(6)
	42
	43	#define RV8803_FLAG_V1F BIT(0)
	44	#define RV8803_FLAG_V2F BIT(1)
	45	#define RV8803_FLAG_AF BIT(3)
	46	#define RV8803_FLAG_TF BIT(4)
	47	#define RV8803_FLAG_UF BIT(5)
	48
	49	#define RV8803_CTRL_RESET BIT(0)
	50
	51	#define RV8803_CTRL_EIE BIT(2)
	52	#define RV8803_CTRL_AIE BIT(3)
	53	#define RV8803_CTRL_TIE BIT(4)
	54	#define RV8803_CTRL_UIE BIT(5)
	55
1cd71376 OR	56	#define RX8900_BACKUP_CTRL 0x18
	57	#define RX8900_FLAG_SWOFF BIT(2)
	58	#define RX8900_FLAG_VDETOFF BIT(3)
	59
	60	enum rv8803_type {
	61	rv_8803,
	62	rx_8900
	63	};
	64
1e3929ef AB	65	struct rv8803_data {
	66	struct i2c_client *client;
	67	struct rtc_device *rtc;
9d1fa4c3	68	struct mutex flags_lock;
1e3929ef	69	u8 ctrl;
1cd71376	70	enum rv8803_type type;
1e3929ef AB	71	};
1e3929ef AB	72
d522649e BT	73	static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
	74	{
	75	int try = RV8803_I2C_TRY_COUNT;
	76	s32 ret;
	77
	78	/*
	79	* There is a 61µs window during which the RTC does not acknowledge I2C
	80	* transfers. In that case, ensure that there are multiple attempts.
	81	*/
	82	do
	83	ret = i2c_smbus_read_byte_data(client, reg);
	84	while ((ret == -ENXIO \|\| ret == -EIO) && --try);
	85	if (ret < 0)
	86	dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);
	87
	88	return ret;
	89	}
	90
	91	static int rv8803_read_regs(const struct i2c_client *client,
	92	u8 reg, u8 count, u8 *values)
	93	{
	94	int try = RV8803_I2C_TRY_COUNT;
	95	s32 ret;
	96
	97	do
	98	ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);
	99	while ((ret == -ENXIO \|\| ret == -EIO) && --try);
	100	if (ret != count) {
	101	dev_err(&client->dev,
	102	"Unable to read registers 0x%02x..0x%02x\n",
	103	reg, reg + count - 1);
	104	return ret < 0 ? ret : -EIO;
	105	}
	106
	107	return 0;
	108	}
	109
	110	static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)
	111	{
	112	int try = RV8803_I2C_TRY_COUNT;
	113	s32 ret;
	114
	115	do
	116	ret = i2c_smbus_write_byte_data(client, reg, value);
	117	while ((ret == -ENXIO \|\| ret == -EIO) && --try);
	118	if (ret)
	119	dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);
	120
	121	return ret;
	122	}
	123
	124	static int rv8803_write_regs(const struct i2c_client *client,
	125	u8 reg, u8 count, const u8 *values)
	126	{
	127	int try = RV8803_I2C_TRY_COUNT;
	128	s32 ret;
	129
	130	do
	131	ret = i2c_smbus_write_i2c_block_data(client, reg, count,
	132	values);
	133	while ((ret == -ENXIO \|\| ret == -EIO) && --try);
	134	if (ret)
	135	dev_err(&client->dev,
	136	"Unable to write registers 0x%02x..0x%02x\n",
137	reg, reg + count - 1);
138
139	return ret;
140	}
141
1e3929ef AB	142	static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
	143	{
	144	struct i2c_client *client = dev_id;
	145	struct rv8803_data *rv8803 = i2c_get_clientdata(client);
	146	unsigned long events = 0;
d522649e	147	int flags;
1e3929ef	148
9d1fa4c3	149	mutex_lock(&rv8803->flags_lock);
1e3929ef	150
d522649e	151	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef	152	if (flags <= 0) {
9d1fa4c3	153	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	154	return IRQ_NONE;
	155	}
	156
	157	if (flags & RV8803_FLAG_V1F)
	158	dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
	159
	160	if (flags & RV8803_FLAG_V2F)
	161	dev_warn(&client->dev, "Voltage low, data loss detected.\n");
	162
	163	if (flags & RV8803_FLAG_TF) {
	164	flags &= ~RV8803_FLAG_TF;
	165	rv8803->ctrl &= ~RV8803_CTRL_TIE;
	166	events \|= RTC_PF;
	167	}
	168
	169	if (flags & RV8803_FLAG_AF) {
	170	flags &= ~RV8803_FLAG_AF;
	171	rv8803->ctrl &= ~RV8803_CTRL_AIE;
	172	events \|= RTC_AF;
	173	}
	174
	175	if (flags & RV8803_FLAG_UF) {
	176	flags &= ~RV8803_FLAG_UF;
	177	rv8803->ctrl &= ~RV8803_CTRL_UIE;
	178	events \|= RTC_UF;
	179	}
	180
	181	if (events) {
	182	rtc_update_irq(rv8803->rtc, 1, events);
d522649e BT	183	rv8803_write_reg(client, RV8803_FLAG, flags);
d522649e BT	184	rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);
1e3929ef AB	185	}
1e3929ef AB	186
9d1fa4c3	187	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	188
	189	return IRQ_HANDLED;
	190	}
	191
	192	static int rv8803_get_time(struct device dev, struct rtc_time tm)
	193	{
	194	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	195	u8 date1[7];
	196	u8 date2[7];
	197	u8 *date = date1;
	198	int ret, flags;
	199
d522649e	200	flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
1e3929ef AB	201	if (flags < 0)
	202	return flags;
	203
	204	if (flags & RV8803_FLAG_V2F) {
	205	dev_warn(dev, "Voltage low, data is invalid.\n");
	206	return -EINVAL;
	207	}
	208
d522649e BT	209	ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);
	210	if (ret)
	211	return ret;
1e3929ef AB	212
1e3929ef AB	213	if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {
d522649e BT	214	ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);
	215	if (ret)
	216	return ret;
1e3929ef AB	217
	218	if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))
	219	date = date2;
	220	}
	221
	222	tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f);
	223	tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f);
	224	tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);
a1e98e09	225	tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);
1e3929ef AB	226	tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);
	227	tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;
	228	tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;
	229
96acb25c	230	return 0;
1e3929ef AB	231	}
	232
	233	static int rv8803_set_time(struct device dev, struct rtc_time tm)
	234	{
	235	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	236	u8 date[7];
d3700b6b	237	int ctrl, flags, ret;
1e3929ef AB	238
	239	if ((tm->tm_year < 100) \|\| (tm->tm_year > 199))
	240	return -EINVAL;
	241
d3700b6b BT	242	ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
	243	if (ctrl < 0)
	244	return ctrl;
	245
	246	/* Stop the clock */
	247	ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
	248	ctrl \| RV8803_CTRL_RESET);
	249	if (ret)
	250	return ret;
	251
1e3929ef AB	252	date[RV8803_SEC] = bin2bcd(tm->tm_sec);
	253	date[RV8803_MIN] = bin2bcd(tm->tm_min);
	254	date[RV8803_HOUR] = bin2bcd(tm->tm_hour);
	255	date[RV8803_WEEK] = 1 << (tm->tm_wday);
	256	date[RV8803_DAY] = bin2bcd(tm->tm_mday);
	257	date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);
	258	date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100);
	259
d522649e BT	260	ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);
d522649e BT	261	if (ret)
1e3929ef AB	262	return ret;
1e3929ef AB	263
d3700b6b BT	264	/* Restart the clock */
	265	ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
	266	ctrl & ~RV8803_CTRL_RESET);
	267	if (ret)
	268	return ret;
	269
9d1fa4c3	270	mutex_lock(&rv8803->flags_lock);
1e3929ef	271
d522649e	272	flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
1e3929ef	273	if (flags < 0) {
9d1fa4c3	274	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	275	return flags;
	276	}
	277
d522649e	278	ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
6f367788	279	flags & ~(RV8803_FLAG_V1F \| RV8803_FLAG_V2F));
1e3929ef	280
9d1fa4c3	281	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	282
	283	return ret;
	284	}
	285
	286	static int rv8803_get_alarm(struct device dev, struct rtc_wkalrm alrm)
	287	{
	288	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	289	struct i2c_client *client = rv8803->client;
	290	u8 alarmvals[3];
	291	int flags, ret;
	292
d522649e BT	293	ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);
	294	if (ret)
	295	return ret;
1e3929ef	296
d522649e	297	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef AB	298	if (flags < 0)
	299	return flags;
	300
	301	alrm->time.tm_sec = 0;
	302	alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
	303	alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
1e3929ef	304	alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
1e3929ef AB	305
	306	alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);
	307	alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;
	308
	309	return 0;
	310	}
	311
	312	static int rv8803_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	313	{
	314	struct i2c_client *client = to_i2c_client(dev);
	315	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	316	u8 alarmvals[3];
	317	u8 ctrl[2];
	318	int ret, err;
1e3929ef AB	319
	320	/* The alarm has no seconds, round up to nearest minute */
	321	if (alrm->time.tm_sec) {
	322	time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
	323
	324	alarm_time += 60 - alrm->time.tm_sec;
	325	rtc_time64_to_tm(alarm_time, &alrm->time);
	326	}
	327
9d1fa4c3	328	mutex_lock(&rv8803->flags_lock);
1e3929ef	329
d522649e BT	330	ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);
d522649e BT	331	if (ret) {
9d1fa4c3	332	mutex_unlock(&rv8803->flags_lock);
d522649e	333	return ret;
1e3929ef AB	334	}
	335
	336	alarmvals[0] = bin2bcd(alrm->time.tm_min);
	337	alarmvals[1] = bin2bcd(alrm->time.tm_hour);
	338	alarmvals[2] = bin2bcd(alrm->time.tm_mday);
	339
	340	if (rv8803->ctrl & (RV8803_CTRL_AIE \| RV8803_CTRL_UIE)) {
	341	rv8803->ctrl &= ~(RV8803_CTRL_AIE \| RV8803_CTRL_UIE);
d522649e BT	342	err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
d522649e BT	343	rv8803->ctrl);
1e3929ef	344	if (err) {
9d1fa4c3	345	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	346	return err;
	347	}
	348	}
	349
	350	ctrl[1] &= ~RV8803_FLAG_AF;
d522649e	351	err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]);
9d1fa4c3	352	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	353	if (err)
	354	return err;
	355
d522649e	356	err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);
1e3929ef AB	357	if (err)
	358	return err;
	359
	360	if (alrm->enabled) {
	361	if (rv8803->rtc->uie_rtctimer.enabled)
	362	rv8803->ctrl \|= RV8803_CTRL_UIE;
	363	if (rv8803->rtc->aie_timer.enabled)
	364	rv8803->ctrl \|= RV8803_CTRL_AIE;
	365
d522649e BT	366	err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
d522649e BT	367	rv8803->ctrl);
1e3929ef AB	368	if (err)
	369	return err;
	370	}
	371
	372	return 0;
	373	}
	374
	375	static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)
	376	{
	377	struct i2c_client *client = to_i2c_client(dev);
	378	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	379	int ctrl, flags, err;
1e3929ef AB	380
	381	ctrl = rv8803->ctrl;
	382
	383	if (enabled) {
	384	if (rv8803->rtc->uie_rtctimer.enabled)
	385	ctrl \|= RV8803_CTRL_UIE;
	386	if (rv8803->rtc->aie_timer.enabled)
	387	ctrl \|= RV8803_CTRL_AIE;
	388	} else {
	389	if (!rv8803->rtc->uie_rtctimer.enabled)
	390	ctrl &= ~RV8803_CTRL_UIE;
	391	if (!rv8803->rtc->aie_timer.enabled)
	392	ctrl &= ~RV8803_CTRL_AIE;
	393	}
	394
9d1fa4c3	395	mutex_lock(&rv8803->flags_lock);
d522649e	396	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef	397	if (flags < 0) {
9d1fa4c3	398	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	399	return flags;
	400	}
	401	flags &= ~(RV8803_FLAG_AF \| RV8803_FLAG_UF);
d522649e	402	err = rv8803_write_reg(client, RV8803_FLAG, flags);
9d1fa4c3	403	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	404	if (err)
	405	return err;
	406
	407	if (ctrl != rv8803->ctrl) {
	408	rv8803->ctrl = ctrl;
d522649e	409	err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);
1e3929ef AB	410	if (err)
	411	return err;
	412	}
	413
	414	return 0;
	415	}
	416
	417	static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	418	{
	419	struct i2c_client *client = to_i2c_client(dev);
	420	struct rv8803_data *rv8803 = dev_get_drvdata(dev);
	421	int flags, ret = 0;
1e3929ef AB	422
	423	switch (cmd) {
	424	case RTC_VL_READ:
d522649e	425	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef AB	426	if (flags < 0)
	427	return flags;
	428
	429	if (flags & RV8803_FLAG_V1F)
	430	dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
	431
	432	if (flags & RV8803_FLAG_V2F)
	433	dev_warn(&client->dev, "Voltage low, data loss detected.\n");
	434
	435	flags &= RV8803_FLAG_V1F \| RV8803_FLAG_V2F;
	436
	437	if (copy_to_user((void __user *)arg, &flags, sizeof(int)))
	438	return -EFAULT;
	439
	440	return 0;
	441
	442	case RTC_VL_CLR:
9d1fa4c3	443	mutex_lock(&rv8803->flags_lock);
d522649e	444	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef	445	if (flags < 0) {
9d1fa4c3	446	mutex_unlock(&rv8803->flags_lock);
1e3929ef AB	447	return flags;
	448	}
	449
	450	flags &= ~(RV8803_FLAG_V1F \| RV8803_FLAG_V2F);
d522649e	451	ret = rv8803_write_reg(client, RV8803_FLAG, flags);
9d1fa4c3	452	mutex_unlock(&rv8803->flags_lock);
d522649e	453	if (ret)
1e3929ef AB	454	return ret;
	455
	456	return 0;
	457
	458	default:
	459	return -ENOIOCTLCMD;
	460	}
	461	}
	462
16d70a78 AB	463	static int rv8803_nvram_write(void priv, unsigned int offset, void val,
16d70a78 AB	464	size_t bytes)
1e3929ef	465	{
1e3929ef AB	466	int ret;
1e3929ef AB	467
16d70a78	468	ret = rv8803_write_reg(priv, RV8803_RAM, (u8 )val);
d522649e	469	if (ret)
1e3929ef AB	470	return ret;
1e3929ef AB	471
16d70a78	472	return 0;
1e3929ef AB	473	}
1e3929ef AB	474
16d70a78 AB	475	static int rv8803_nvram_read(void *priv, unsigned int offset,
16d70a78 AB	476	void *val, size_t bytes)
1e3929ef	477	{
1e3929ef AB	478	int ret;
1e3929ef AB	479
16d70a78	480	ret = rv8803_read_reg(priv, RV8803_RAM);
1e3929ef AB	481	if (ret < 0)
	482	return ret;
	483
16d70a78	484	(u8 )val = ret;
1e3929ef	485
16d70a78	486	return 0;
1e3929ef AB	487	}
1e3929ef AB	488
1e3929ef AB	489	static struct rtc_class_ops rv8803_rtc_ops = {
	490	.read_time = rv8803_get_time,
	491	.set_time = rv8803_set_time,
	492	.ioctl = rv8803_ioctl,
	493	};
	494
1cd71376 OR	495	static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
	496	{
	497	struct i2c_client *client = rv8803->client;
	498	struct device_node *node = client->dev.of_node;
	499	int err;
	500	u8 flags;
	501
	502	if (!node)
	503	return 0;
	504
	505	if (rv8803->type != rx_8900)
	506	return 0;
	507
	508	err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
	509	if (err < 0)
	510	return err;
	511
	512	flags = ~(RX8900_FLAG_VDETOFF \| RX8900_FLAG_SWOFF) & (u8)err;
	513
	514	if (of_property_read_bool(node, "epson,vdet-disable"))
	515	flags \|= RX8900_FLAG_VDETOFF;
	516
	517	if (of_property_read_bool(node, "trickle-diode-disable"))
	518	flags \|= RX8900_FLAG_SWOFF;
	519
	520	return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
	521	flags);
	522	}
	523
1e3929ef AB	524	static int rv8803_probe(struct i2c_client *client,
	525	const struct i2c_device_id *id)
	526	{
	527	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	528	struct rv8803_data *rv8803;
d522649e	529	int err, flags;
c07fd9de AB	530	struct nvmem_config nvmem_cfg = {
	531	.name = "rv8803_nvram",
	532	.word_size = 1,
	533	.stride = 1,
	534	.size = 1,
	535	.reg_read = rv8803_nvram_read,
	536	.reg_write = rv8803_nvram_write,
	537	.priv = client,
	538	};
1e3929ef AB	539
	540	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
	541	I2C_FUNC_SMBUS_I2C_BLOCK)) {
	542	dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_I2C_BLOCK\n");
	543	return -EIO;
	544	}
	545
	546	rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data),
	547	GFP_KERNEL);
	548	if (!rv8803)
	549	return -ENOMEM;
	550
9d1fa4c3	551	mutex_init(&rv8803->flags_lock);
1e3929ef	552	rv8803->client = client;
740ad8f4 JMC	553	if (client->dev.of_node)
	554	rv8803->type = (enum rv8803_type)
	555	of_device_get_match_data(&client->dev);
	556	else
	557	rv8803->type = id->driver_data;
1e3929ef AB	558	i2c_set_clientdata(client, rv8803);
1e3929ef AB	559
d522649e	560	flags = rv8803_read_reg(client, RV8803_FLAG);
1e3929ef AB	561	if (flags < 0)
	562	return flags;
	563
	564	if (flags & RV8803_FLAG_V1F)
	565	dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
	566
	567	if (flags & RV8803_FLAG_V2F)
	568	dev_warn(&client->dev, "Voltage low, data loss detected.\n");
	569
	570	if (flags & RV8803_FLAG_AF)
	571	dev_warn(&client->dev, "An alarm maybe have been missed.\n");
	572
7133eca1 AB	573	rv8803->rtc = devm_rtc_allocate_device(&client->dev);
	574	if (IS_ERR(rv8803->rtc)) {
	575	return PTR_ERR(rv8803->rtc);
	576	}
	577
1e3929ef AB	578	if (client->irq > 0) {
	579	err = devm_request_threaded_irq(&client->dev, client->irq,
	580	NULL, rv8803_handle_irq,
	581	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	582	"rv8803", client);
	583	if (err) {
	584	dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
	585	client->irq = 0;
	586	} else {
	587	rv8803_rtc_ops.read_alarm = rv8803_get_alarm;
	588	rv8803_rtc_ops.set_alarm = rv8803_set_alarm;
	589	rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable;
	590	}
	591	}
	592
d522649e	593	err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
1e3929ef AB	594	if (err)
	595	return err;
	596
1cd71376 OR	597	err = rx8900_trickle_charger_init(rv8803);
	598	if (err) {
	599	dev_err(&client->dev, "failed to init charger\n");
	600	return err;
	601	}
	602
ce1ae8eb AB	603	rv8803->rtc->ops = &rv8803_rtc_ops;
	604	rv8803->rtc->nvram_old_abi = true;
	605	err = rtc_register_device(rv8803->rtc);
	606	if (err)
	607	return err;
	608
	609	rtc_nvmem_register(rv8803->rtc, &nvmem_cfg);
	610
1e3929ef AB	611	rv8803->rtc->max_user_freq = 1;
	612
	613	return 0;
	614	}
	615
1e3929ef	616	static const struct i2c_device_id rv8803_id[] = {
1cd71376 OR	617	{ "rv8803", rv_8803 },
1cd71376 OR	618	{ "rx8900", rx_8900 },
1e3929ef AB	619	{ }
	620	};
	621	MODULE_DEVICE_TABLE(i2c, rv8803_id);
	622
740ad8f4 JMC	623	static const struct of_device_id rv8803_of_match[] = {
	624	{
	625	.compatible = "microcrystal,rv8803",
	626	.data = (void *)rx_8900
	627	},
	628	{
	629	.compatible = "epson,rx8900",
	630	.data = (void *)rx_8900
	631	},
	632	{ }
	633	};
	634	MODULE_DEVICE_TABLE(of, rv8803_of_match);
	635
1e3929ef AB	636	static struct i2c_driver rv8803_driver = {
	637	.driver = {
	638	.name = "rtc-rv8803",
740ad8f4	639	.of_match_table = of_match_ptr(rv8803_of_match),
1e3929ef AB	640	},
1e3929ef AB	641	.probe = rv8803_probe,
1e3929ef AB	642	.id_table = rv8803_id,
	643	};
	644	module_i2c_driver(rv8803_driver);
	645
	646	MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
	647	MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
	648	MODULE_LICENSE("GPL v2");