[GitHub/LineageOS/android_kernel_motorola_exynos9610.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;
	struct nvmem_config nvmem_cfg;
};

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;

	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;
		}
	}

	rv8803->nvmem_cfg.name = "rv8803_nvram",
	rv8803->nvmem_cfg.word_size = 1,
	rv8803->nvmem_cfg.stride = 1,
	rv8803->nvmem_cfg.size = 1,
	rv8803->nvmem_cfg.reg_read = rv8803_nvram_read,
	rv8803->nvmem_cfg.reg_write = rv8803_nvram_write,
	rv8803->nvmem_cfg.priv = client;

	rv8803->rtc->ops = &rv8803_rtc_ops;
	rv8803->rtc->nvmem_config = &rv8803->nvmem_cfg;
	rv8803->rtc->nvram_old_abi = true;
	err = rtc_register_device(rv8803->rtc);
	if (err)
		return err;

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