[linux-2.6-block.git] / drivers / rtc / rtc-abx80x.c

/*
 * A driver for the I2C members of the Abracon AB x8xx RTC family,
 * and compatible: AB 1805 and AB 0805
 *
 * Copyright 2014-2015 Macq S.A.
 *
 * Author: Philippe De Muyter <phdm@macqel.be>
 * Author: 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/i2c.h>
#include <linux/module.h>
#include <linux/rtc.h>

#define ABX8XX_REG_HTH		0x00
#define ABX8XX_REG_SC		0x01
#define ABX8XX_REG_MN		0x02
#define ABX8XX_REG_HR		0x03
#define ABX8XX_REG_DA		0x04
#define ABX8XX_REG_MO		0x05
#define ABX8XX_REG_YR		0x06
#define ABX8XX_REG_WD		0x07

#define ABX8XX_REG_AHTH		0x08
#define ABX8XX_REG_ASC		0x09
#define ABX8XX_REG_AMN		0x0a
#define ABX8XX_REG_AHR		0x0b
#define ABX8XX_REG_ADA		0x0c
#define ABX8XX_REG_AMO		0x0d
#define ABX8XX_REG_AWD		0x0e

#define ABX8XX_REG_STATUS	0x0f
#define ABX8XX_STATUS_AF	BIT(2)

#define ABX8XX_REG_CTRL1	0x10
#define ABX8XX_CTRL_WRITE	BIT(0)
#define ABX8XX_CTRL_ARST	BIT(2)
#define ABX8XX_CTRL_12_24	BIT(6)

#define ABX8XX_REG_IRQ		0x12
#define ABX8XX_IRQ_AIE		BIT(2)
#define ABX8XX_IRQ_IM_1_4	(0x3 << 5)

#define ABX8XX_REG_CD_TIMER_CTL	0x18

#define ABX8XX_REG_OSC		0x1c
#define ABX8XX_OSC_FOS		BIT(3)
#define ABX8XX_OSC_BOS		BIT(4)
#define ABX8XX_OSC_ACAL_512	BIT(5)
#define ABX8XX_OSC_ACAL_1024	BIT(6)

#define ABX8XX_OSC_OSEL		BIT(7)

#define ABX8XX_REG_OSS		0x1d
#define ABX8XX_OSS_OF		BIT(1)
#define ABX8XX_OSS_OMODE	BIT(4)

#define ABX8XX_REG_CFG_KEY	0x1f
#define ABX8XX_CFG_KEY_OSC	0xa1
#define ABX8XX_CFG_KEY_MISC	0x9d

#define ABX8XX_REG_ID0		0x28

#define ABX8XX_REG_TRICKLE	0x20
#define ABX8XX_TRICKLE_CHARGE_ENABLE	0xa0
#define ABX8XX_TRICKLE_STANDARD_DIODE	0x8
#define ABX8XX_TRICKLE_SCHOTTKY_DIODE	0x4

static u8 trickle_resistors[] = {0, 3, 6, 11};

enum abx80x_chip {AB0801, AB0803, AB0804, AB0805,
	AB1801, AB1803, AB1804, AB1805, ABX80X};

struct abx80x_cap {
	u16 pn;
	bool has_tc;
};

static struct abx80x_cap abx80x_caps[] = {
	[AB0801] = {.pn = 0x0801},
	[AB0803] = {.pn = 0x0803},
	[AB0804] = {.pn = 0x0804, .has_tc = true},
	[AB0805] = {.pn = 0x0805, .has_tc = true},
	[AB1801] = {.pn = 0x1801},
	[AB1803] = {.pn = 0x1803},
	[AB1804] = {.pn = 0x1804, .has_tc = true},
	[AB1805] = {.pn = 0x1805, .has_tc = true},
	[ABX80X] = {.pn = 0}
};

static int abx80x_is_rc_mode(struct i2c_client *client)
{
	int flags = 0;

	flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
	if (flags < 0) {
		dev_err(&client->dev,
			"Failed to read autocalibration attribute\n");
		return flags;
	}

	return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
}

static int abx80x_enable_trickle_charger(struct i2c_client *client,
					 u8 trickle_cfg)
{
	int err;

	/*
	 * Write the configuration key register to enable access to the Trickle
	 * register
	 */
	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
					ABX8XX_CFG_KEY_MISC);
	if (err < 0) {
		dev_err(&client->dev, "Unable to write configuration key\n");
		return -EIO;
	}

	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
					ABX8XX_TRICKLE_CHARGE_ENABLE |
					trickle_cfg);
	if (err < 0) {
		dev_err(&client->dev, "Unable to write trickle register\n");
		return -EIO;
	}

	return 0;
}

static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned char buf[8];
	int err, flags, rc_mode = 0;

	/* Read the Oscillator Failure only in XT mode */
	rc_mode = abx80x_is_rc_mode(client);
	if (rc_mode < 0)
		return rc_mode;

	if (!rc_mode) {
		flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
		if (flags < 0)
			return flags;

		if (flags & ABX8XX_OSS_OF) {
			dev_err(dev, "Oscillator failure, data is invalid.\n");
			return -EINVAL;
		}
	}

	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
					    sizeof(buf), buf);
	if (err < 0) {
		dev_err(&client->dev, "Unable to read date\n");
		return -EIO;
	}

	tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F);
	tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F);
	tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F);
	tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7;
	tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F);
	tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1;
	tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100;

	return 0;
}

static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned char buf[8];
	int err, flags;

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

	buf[ABX8XX_REG_HTH] = 0;
	buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec);
	buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min);
	buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour);
	buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday);
	buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
	buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
	buf[ABX8XX_REG_WD] = tm->tm_wday;

	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
					     sizeof(buf), buf);
	if (err < 0) {
		dev_err(&client->dev, "Unable to write to date registers\n");
		return -EIO;
	}

	/* Clear the OF bit of Oscillator Status Register */
	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
	if (flags < 0)
		return flags;

	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
					flags & ~ABX8XX_OSS_OF);
	if (err < 0) {
		dev_err(&client->dev, "Unable to write oscillator status register\n");
		return err;
	}

	return 0;
}

static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
{
	struct i2c_client *client = dev_id;
	struct rtc_device *rtc = i2c_get_clientdata(client);
	int status;

	status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
	if (status < 0)
		return IRQ_NONE;

	if (status & ABX8XX_STATUS_AF)
		rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);

	i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);

	return IRQ_HANDLED;
}

static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned char buf[7];

	int irq_mask, err;

	if (client->irq <= 0)
		return -EINVAL;

	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
					    sizeof(buf), buf);
	if (err)
		return err;

	irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ);
	if (irq_mask < 0)
		return irq_mask;

	t->time.tm_sec = bcd2bin(buf[0] & 0x7F);
	t->time.tm_min = bcd2bin(buf[1] & 0x7F);
	t->time.tm_hour = bcd2bin(buf[2] & 0x3F);
	t->time.tm_mday = bcd2bin(buf[3] & 0x3F);
	t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1;
	t->time.tm_wday = buf[5] & 0x7;

	t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE);
	t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled;

	return err;
}

static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct i2c_client *client = to_i2c_client(dev);
	u8 alarm[6];
	int err;

	if (client->irq <= 0)
		return -EINVAL;

	alarm[0] = 0x0;
	alarm[1] = bin2bcd(t->time.tm_sec);
	alarm[2] = bin2bcd(t->time.tm_min);
	alarm[3] = bin2bcd(t->time.tm_hour);
	alarm[4] = bin2bcd(t->time.tm_mday);
	alarm[5] = bin2bcd(t->time.tm_mon + 1);

	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
					     sizeof(alarm), alarm);
	if (err < 0) {
		dev_err(&client->dev, "Unable to write alarm registers\n");
		return -EIO;
	}

	if (t->enabled) {
		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
						(ABX8XX_IRQ_IM_1_4 |
						 ABX8XX_IRQ_AIE));
		if (err)
			return err;
	}

	return 0;
}

static int abx80x_rtc_set_autocalibration(struct device *dev,
					  int autocalibration)
{
	struct i2c_client *client = to_i2c_client(dev);
	int retval, flags = 0;

	if ((autocalibration != 0) && (autocalibration != 1024) &&
	    (autocalibration != 512)) {
		dev_err(dev, "autocalibration value outside permitted range\n");
		return -EINVAL;
	}

	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
	if (flags < 0)
		return flags;

	if (autocalibration == 0) {
		flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
	} else if (autocalibration == 1024) {
		/* 1024 autocalibration is 0x10 */
		flags |= ABX8XX_OSC_ACAL_1024;
		flags &= ~(ABX8XX_OSC_ACAL_512);
	} else {
		/* 512 autocalibration is 0x11 */
		flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512);
	}

	/* Unlock write access to Oscillator Control Register */
	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
					   ABX8XX_CFG_KEY_OSC);
	if (retval < 0) {
		dev_err(dev, "Failed to write CONFIG_KEY register\n");
		return retval;
	}

	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);

	return retval;
}

static int abx80x_rtc_get_autocalibration(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	int flags = 0, autocalibration;

	flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
	if (flags < 0)
		return flags;

	if (flags & ABX8XX_OSC_ACAL_512)
		autocalibration = 512;
	else if (flags & ABX8XX_OSC_ACAL_1024)
		autocalibration = 1024;
	else
		autocalibration = 0;

	return autocalibration;
}

static ssize_t autocalibration_store(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	int retval;
	unsigned long autocalibration = 0;

	retval = kstrtoul(buf, 10, &autocalibration);
	if (retval < 0) {
		dev_err(dev, "Failed to store RTC autocalibration attribute\n");
		return -EINVAL;
	}

	retval = abx80x_rtc_set_autocalibration(dev, autocalibration);

	return retval ? retval : count;
}

static ssize_t autocalibration_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	int autocalibration = 0;

	autocalibration = abx80x_rtc_get_autocalibration(dev);
	if (autocalibration < 0) {
		dev_err(dev, "Failed to read RTC autocalibration\n");
		sprintf(buf, "0\n");
		return autocalibration;
	}

	return sprintf(buf, "%d\n", autocalibration);
}

static DEVICE_ATTR_RW(autocalibration);

static ssize_t oscillator_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	int retval, flags, rc_mode = 0;

	if (strncmp(buf, "rc", 2) == 0) {
		rc_mode = 1;
	} else if (strncmp(buf, "xtal", 4) == 0) {
		rc_mode = 0;
	} else {
		dev_err(dev, "Oscillator selection value outside permitted ones\n");
		return -EINVAL;
	}

	flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
	if (flags < 0)
		return flags;

	if (rc_mode == 0)
		flags &= ~(ABX8XX_OSC_OSEL);
	else
		flags |= (ABX8XX_OSC_OSEL);

	/* Unlock write access on Oscillator Control register */
	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
					   ABX8XX_CFG_KEY_OSC);
	if (retval < 0) {
		dev_err(dev, "Failed to write CONFIG_KEY register\n");
		return retval;
	}

	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
	if (retval < 0) {
		dev_err(dev, "Failed to write Oscillator Control register\n");
		return retval;
	}

	return retval ? retval : count;
}

static ssize_t oscillator_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	int rc_mode = 0;
	struct i2c_client *client = to_i2c_client(dev);

	rc_mode = abx80x_is_rc_mode(client);

	if (rc_mode < 0) {
		dev_err(dev, "Failed to read RTC oscillator selection\n");
		sprintf(buf, "\n");
		return rc_mode;
	}

	if (rc_mode)
		return sprintf(buf, "rc\n");
	else
		return sprintf(buf, "xtal\n");
}

static DEVICE_ATTR_RW(oscillator);

static struct attribute *rtc_calib_attrs[] = {
	&dev_attr_autocalibration.attr,
	&dev_attr_oscillator.attr,
	NULL,
};

static const struct attribute_group rtc_calib_attr_group = {
	.attrs		= rtc_calib_attrs,
};

static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct i2c_client *client = to_i2c_client(dev);
	int err;

	if (enabled)
		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
						(ABX8XX_IRQ_IM_1_4 |
						 ABX8XX_IRQ_AIE));
	else
		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
						ABX8XX_IRQ_IM_1_4);
	return err;
}

static const struct rtc_class_ops abx80x_rtc_ops = {
	.read_time	= abx80x_rtc_read_time,
	.set_time	= abx80x_rtc_set_time,
	.read_alarm	= abx80x_read_alarm,
	.set_alarm	= abx80x_set_alarm,
	.alarm_irq_enable = abx80x_alarm_irq_enable,
};

static int abx80x_dt_trickle_cfg(struct device_node *np)
{
	const char *diode;
	int trickle_cfg = 0;
	int i, ret;
	u32 tmp;

	ret = of_property_read_string(np, "abracon,tc-diode", &diode);
	if (ret)
		return ret;

	if (!strcmp(diode, "standard"))
		trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE;
	else if (!strcmp(diode, "schottky"))
		trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
	else
		return -EINVAL;

	ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
	if (ret)
		return ret;

	for (i = 0; i < sizeof(trickle_resistors); i++)
		if (trickle_resistors[i] == tmp)
			break;

	if (i == sizeof(trickle_resistors))
		return -EINVAL;

	return (trickle_cfg | i);
}

static void rtc_calib_remove_sysfs_group(void *_dev)
{
	struct device *dev = _dev;

	sysfs_remove_group(&dev->kobj, &rtc_calib_attr_group);
}

static int abx80x_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device_node *np = client->dev.of_node;
	struct rtc_device *rtc;
	int i, data, err, trickle_cfg = -EINVAL;
	char buf[7];
	unsigned int part = id->driver_data;
	unsigned int partnumber;
	unsigned int majrev, minrev;
	unsigned int lot;
	unsigned int wafer;
	unsigned int uid;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
		return -ENODEV;

	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
					    sizeof(buf), buf);
	if (err < 0) {
		dev_err(&client->dev, "Unable to read partnumber\n");
		return -EIO;
	}

	partnumber = (buf[0] << 8) | buf[1];
	majrev = buf[2] >> 3;
	minrev = buf[2] & 0x7;
	lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3];
	uid = ((buf[4] & 0x7f) << 8) | buf[5];
	wafer = (buf[6] & 0x7c) >> 2;
	dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
		 partnumber, majrev, minrev, lot, wafer, uid);

	data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
	if (data < 0) {
		dev_err(&client->dev, "Unable to read control register\n");
		return -EIO;
	}

	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
					((data & ~(ABX8XX_CTRL_12_24 |
						   ABX8XX_CTRL_ARST)) |
					 ABX8XX_CTRL_WRITE));
	if (err < 0) {
		dev_err(&client->dev, "Unable to write control register\n");
		return -EIO;
	}

	/* part autodetection */
	if (part == ABX80X) {
		for (i = 0; abx80x_caps[i].pn; i++)
			if (partnumber == abx80x_caps[i].pn)
				break;
		if (abx80x_caps[i].pn == 0) {
			dev_err(&client->dev, "Unknown part: %04x\n",
				partnumber);
			return -EINVAL;
		}
		part = i;
	}

	if (partnumber != abx80x_caps[part].pn) {
		dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
			partnumber, abx80x_caps[part].pn);
		return -EINVAL;
	}

	if (np && abx80x_caps[part].has_tc)
		trickle_cfg = abx80x_dt_trickle_cfg(np);

	if (trickle_cfg > 0) {
		dev_info(&client->dev, "Enabling trickle charger: %02x\n",
			 trickle_cfg);
		abx80x_enable_trickle_charger(client, trickle_cfg);
	}

	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL,
					BIT(2));
	if (err)
		return err;

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

	rtc->ops = &abx80x_rtc_ops;

	i2c_set_clientdata(client, rtc);

	if (client->irq > 0) {
		dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
		err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
						abx80x_handle_irq,
						IRQF_SHARED | IRQF_ONESHOT,
						"abx8xx",
						client);
		if (err) {
			dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
			client->irq = 0;
		}
	}

	/* Export sysfs entries */
	err = sysfs_create_group(&(&client->dev)->kobj, &rtc_calib_attr_group);
	if (err) {
		dev_err(&client->dev, "Failed to create sysfs group: %d\n",
			err);
		return err;
	}

	err = devm_add_action_or_reset(&client->dev,
				       rtc_calib_remove_sysfs_group,
				       &client->dev);
	if (err) {
		dev_err(&client->dev,
			"Failed to add sysfs cleanup action: %d\n",
			err);
		return err;
	}

	err = rtc_register_device(rtc);

	return err;
}

static int abx80x_remove(struct i2c_client *client)
{
	return 0;
}

static const struct i2c_device_id abx80x_id[] = {
	{ "abx80x", ABX80X },
	{ "ab0801", AB0801 },
	{ "ab0803", AB0803 },
	{ "ab0804", AB0804 },
	{ "ab0805", AB0805 },
	{ "ab1801", AB1801 },
	{ "ab1803", AB1803 },
	{ "ab1804", AB1804 },
	{ "ab1805", AB1805 },
	{ "rv1805", AB1805 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, abx80x_id);

static struct i2c_driver abx80x_driver = {
	.driver		= {
		.name	= "rtc-abx80x",
	},
	.probe		= abx80x_probe,
	.remove		= abx80x_remove,
	.id_table	= abx80x_id,
};

module_i2c_driver(abx80x_driver);

MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
MODULE_DESCRIPTION("Abracon ABX80X RTC driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
4d61ff6b PDM	1	/*
	2	* A driver for the I2C members of the Abracon AB x8xx RTC family,
	3	* and compatible: AB 1805 and AB 0805
	4	*
	5	* Copyright 2014-2015 Macq S.A.
	6	*
	7	* Author: Philippe De Muyter <phdm@macqel.be>
	8	* Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	*/
	15
	16	#include <linux/bcd.h>
	17	#include <linux/i2c.h>
	18	#include <linux/module.h>
	19	#include <linux/rtc.h>
	20
	21	#define ABX8XX_REG_HTH 0x00
	22	#define ABX8XX_REG_SC 0x01
	23	#define ABX8XX_REG_MN 0x02
	24	#define ABX8XX_REG_HR 0x03
	25	#define ABX8XX_REG_DA 0x04
	26	#define ABX8XX_REG_MO 0x05
	27	#define ABX8XX_REG_YR 0x06
	28	#define ABX8XX_REG_WD 0x07
	29
718a820a AB	30	#define ABX8XX_REG_AHTH 0x08
	31	#define ABX8XX_REG_ASC 0x09
	32	#define ABX8XX_REG_AMN 0x0a
	33	#define ABX8XX_REG_AHR 0x0b
	34	#define ABX8XX_REG_ADA 0x0c
	35	#define ABX8XX_REG_AMO 0x0d
	36	#define ABX8XX_REG_AWD 0x0e
	37
	38	#define ABX8XX_REG_STATUS 0x0f
	39	#define ABX8XX_STATUS_AF BIT(2)
	40
4d61ff6b	41	#define ABX8XX_REG_CTRL1 0x10
5f1b2f77	42	#define ABX8XX_CTRL_WRITE BIT(0)
718a820a	43	#define ABX8XX_CTRL_ARST BIT(2)
4d61ff6b PDM	44	#define ABX8XX_CTRL_12_24 BIT(6)
4d61ff6b PDM	45
718a820a AB	46	#define ABX8XX_REG_IRQ 0x12
	47	#define ABX8XX_IRQ_AIE BIT(2)
	48	#define ABX8XX_IRQ_IM_1_4 (0x3 << 5)
	49
	50	#define ABX8XX_REG_CD_TIMER_CTL 0x18
	51
59a8383a MJ	52	#define ABX8XX_REG_OSC 0x1c
	53	#define ABX8XX_OSC_FOS BIT(3)
	54	#define ABX8XX_OSC_BOS BIT(4)
	55	#define ABX8XX_OSC_ACAL_512 BIT(5)
	56	#define ABX8XX_OSC_ACAL_1024 BIT(6)
	57
	58	#define ABX8XX_OSC_OSEL BIT(7)
	59
	60	#define ABX8XX_REG_OSS 0x1d
ee087744	61	#define ABX8XX_OSS_OF BIT(1)
59a8383a MJ	62	#define ABX8XX_OSS_OMODE BIT(4)
59a8383a MJ	63
4d61ff6b	64	#define ABX8XX_REG_CFG_KEY 0x1f
59a8383a	65	#define ABX8XX_CFG_KEY_OSC 0xa1
4d61ff6b PDM	66	#define ABX8XX_CFG_KEY_MISC 0x9d
	67
	68	#define ABX8XX_REG_ID0 0x28
	69
	70	#define ABX8XX_REG_TRICKLE 0x20
	71	#define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0
	72	#define ABX8XX_TRICKLE_STANDARD_DIODE 0x8
	73	#define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4
	74
	75	static u8 trickle_resistors[] = {0, 3, 6, 11};
	76
	77	enum abx80x_chip {AB0801, AB0803, AB0804, AB0805,
	78	AB1801, AB1803, AB1804, AB1805, ABX80X};
	79
	80	struct abx80x_cap {
	81	u16 pn;
	82	bool has_tc;
	83	};
	84
	85	static struct abx80x_cap abx80x_caps[] = {
	86	[AB0801] = {.pn = 0x0801},
	87	[AB0803] = {.pn = 0x0803},
	88	[AB0804] = {.pn = 0x0804, .has_tc = true},
	89	[AB0805] = {.pn = 0x0805, .has_tc = true},
	90	[AB1801] = {.pn = 0x1801},
	91	[AB1803] = {.pn = 0x1803},
	92	[AB1804] = {.pn = 0x1804, .has_tc = true},
	93	[AB1805] = {.pn = 0x1805, .has_tc = true},
	94	[ABX80X] = {.pn = 0}
	95	};
	96
59a8383a MJ	97	static int abx80x_is_rc_mode(struct i2c_client *client)
	98	{
	99	int flags = 0;
	100
	101	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
	102	if (flags < 0) {
	103	dev_err(&client->dev,
	104	"Failed to read autocalibration attribute\n");
	105	return flags;
	106	}
	107
	108	return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
	109	}
	110
4d61ff6b PDM	111	static int abx80x_enable_trickle_charger(struct i2c_client *client,
	112	u8 trickle_cfg)
	113	{
	114	int err;
	115
	116	/*
	117	* Write the configuration key register to enable access to the Trickle
	118	* register
	119	*/
	120	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
	121	ABX8XX_CFG_KEY_MISC);
	122	if (err < 0) {
	123	dev_err(&client->dev, "Unable to write configuration key\n");
	124	return -EIO;
	125	}
	126
	127	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
	128	ABX8XX_TRICKLE_CHARGE_ENABLE \|
	129	trickle_cfg);
	130	if (err < 0) {
	131	dev_err(&client->dev, "Unable to write trickle register\n");
	132	return -EIO;
	133	}
	134
	135	return 0;
	136	}
	137
	138	static int abx80x_rtc_read_time(struct device dev, struct rtc_time tm)
	139	{
	140	struct i2c_client *client = to_i2c_client(dev);
	141	unsigned char buf[8];
ee087744 MJ	142	int err, flags, rc_mode = 0;
	143
	144	/* Read the Oscillator Failure only in XT mode */
	145	rc_mode = abx80x_is_rc_mode(client);
	146	if (rc_mode < 0)
	147	return rc_mode;
	148
	149	if (!rc_mode) {
	150	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
	151	if (flags < 0)
	152	return flags;
	153
	154	if (flags & ABX8XX_OSS_OF) {
	155	dev_err(dev, "Oscillator failure, data is invalid.\n");
	156	return -EINVAL;
	157	}
	158	}
4d61ff6b PDM	159
	160	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
	161	sizeof(buf), buf);
	162	if (err < 0) {
	163	dev_err(&client->dev, "Unable to read date\n");
	164	return -EIO;
	165	}
	166
	167	tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F);
	168	tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F);
	169	tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F);
	170	tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7;
	171	tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F);
	172	tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1;
	173	tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100;
	174
fbfd36fd	175	return 0;
4d61ff6b PDM	176	}
	177
	178	static int abx80x_rtc_set_time(struct device dev, struct rtc_time tm)
	179	{
	180	struct i2c_client *client = to_i2c_client(dev);
	181	unsigned char buf[8];
ee087744	182	int err, flags;
4d61ff6b PDM	183
	184	if (tm->tm_year < 100)
	185	return -EINVAL;
	186
	187	buf[ABX8XX_REG_HTH] = 0;
	188	buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec);
	189	buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min);
	190	buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour);
	191	buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday);
	192	buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
	193	buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
	194	buf[ABX8XX_REG_WD] = tm->tm_wday;
	195
	196	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
	197	sizeof(buf), buf);
	198	if (err < 0) {
	199	dev_err(&client->dev, "Unable to write to date registers\n");
	200	return -EIO;
	201	}
	202
ee087744 MJ	203	/* Clear the OF bit of Oscillator Status Register */
	204	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
	205	if (flags < 0)
	206	return flags;
	207
	208	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
	209	flags & ~ABX8XX_OSS_OF);
	210	if (err < 0) {
	211	dev_err(&client->dev, "Unable to write oscillator status register\n");
	212	return err;
	213	}
	214
4d61ff6b PDM	215	return 0;
	216	}
	217
718a820a AB	218	static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
	219	{
	220	struct i2c_client *client = dev_id;
	221	struct rtc_device *rtc = i2c_get_clientdata(client);
	222	int status;
	223
	224	status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
	225	if (status < 0)
	226	return IRQ_NONE;
	227
	228	if (status & ABX8XX_STATUS_AF)
	229	rtc_update_irq(rtc, 1, RTC_AF \| RTC_IRQF);
	230
	231	i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
	232
	233	return IRQ_HANDLED;
	234	}
	235
	236	static int abx80x_read_alarm(struct device dev, struct rtc_wkalrm t)
	237	{
	238	struct i2c_client *client = to_i2c_client(dev);
	239	unsigned char buf[7];
	240
	241	int irq_mask, err;
	242
	243	if (client->irq <= 0)
	244	return -EINVAL;
	245
	246	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
	247	sizeof(buf), buf);
	248	if (err)
	249	return err;
	250
	251	irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ);
	252	if (irq_mask < 0)
	253	return irq_mask;
	254
	255	t->time.tm_sec = bcd2bin(buf[0] & 0x7F);
	256	t->time.tm_min = bcd2bin(buf[1] & 0x7F);
	257	t->time.tm_hour = bcd2bin(buf[2] & 0x3F);
	258	t->time.tm_mday = bcd2bin(buf[3] & 0x3F);
	259	t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1;
	260	t->time.tm_wday = buf[5] & 0x7;
	261
	262	t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE);
	263	t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled;
	264
	265	return err;
	266	}
	267
	268	static int abx80x_set_alarm(struct device dev, struct rtc_wkalrm t)
	269	{
	270	struct i2c_client *client = to_i2c_client(dev);
	271	u8 alarm[6];
	272	int err;
	273
	274	if (client->irq <= 0)
	275	return -EINVAL;
	276
	277	alarm[0] = 0x0;
	278	alarm[1] = bin2bcd(t->time.tm_sec);
	279	alarm[2] = bin2bcd(t->time.tm_min);
	280	alarm[3] = bin2bcd(t->time.tm_hour);
	281	alarm[4] = bin2bcd(t->time.tm_mday);
282	alarm[5] = bin2bcd(t->time.tm_mon + 1);
283
284	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
285	sizeof(alarm), alarm);
286	if (err < 0) {
287	dev_err(&client->dev, "Unable to write alarm registers\n");
288	return -EIO;
289	}
290
291	if (t->enabled) {
292	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
293	(ABX8XX_IRQ_IM_1_4 \|
294	ABX8XX_IRQ_AIE));
295	if (err)
296	return err;
297	}
298
299	return 0;
300	}
301
59a8383a MJ	302	static int abx80x_rtc_set_autocalibration(struct device *dev,
	303	int autocalibration)
	304	{
	305	struct i2c_client *client = to_i2c_client(dev);
	306	int retval, flags = 0;
	307
	308	if ((autocalibration != 0) && (autocalibration != 1024) &&
	309	(autocalibration != 512)) {
	310	dev_err(dev, "autocalibration value outside permitted range\n");
	311	return -EINVAL;
	312	}
	313
	314	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
	315	if (flags < 0)
	316	return flags;
	317
	318	if (autocalibration == 0) {
	319	flags &= ~(ABX8XX_OSC_ACAL_512 \| ABX8XX_OSC_ACAL_1024);
	320	} else if (autocalibration == 1024) {
	321	/* 1024 autocalibration is 0x10 */
	322	flags \|= ABX8XX_OSC_ACAL_1024;
	323	flags &= ~(ABX8XX_OSC_ACAL_512);
	324	} else {
	325	/* 512 autocalibration is 0x11 */
	326	flags \|= (ABX8XX_OSC_ACAL_1024 \| ABX8XX_OSC_ACAL_512);
	327	}
	328
	329	/* Unlock write access to Oscillator Control Register */
	330	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
	331	ABX8XX_CFG_KEY_OSC);
	332	if (retval < 0) {
	333	dev_err(dev, "Failed to write CONFIG_KEY register\n");
	334	return retval;
	335	}
	336
	337	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
	338
	339	return retval;
	340	}
	341
	342	static int abx80x_rtc_get_autocalibration(struct device *dev)
	343	{
	344	struct i2c_client *client = to_i2c_client(dev);
	345	int flags = 0, autocalibration;
	346
	347	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
	348	if (flags < 0)
	349	return flags;
	350
	351	if (flags & ABX8XX_OSC_ACAL_512)
	352	autocalibration = 512;
	353	else if (flags & ABX8XX_OSC_ACAL_1024)
	354	autocalibration = 1024;
	355	else
	356	autocalibration = 0;
	357
	358	return autocalibration;
	359	}
	360
	361	static ssize_t autocalibration_store(struct device *dev,
	362	struct device_attribute *attr,
	363	const char *buf, size_t count)
	364	{
	365	int retval;
366	unsigned long autocalibration = 0;
367
368	retval = kstrtoul(buf, 10, &autocalibration);
369	if (retval < 0) {
370	dev_err(dev, "Failed to store RTC autocalibration attribute\n");
371	return -EINVAL;
372	}
373
374	retval = abx80x_rtc_set_autocalibration(dev, autocalibration);
375
376	return retval ? retval : count;
377	}
378
379	static ssize_t autocalibration_show(struct device *dev,
380	struct device_attribute attr, char buf)
381	{
382	int autocalibration = 0;
383
384	autocalibration = abx80x_rtc_get_autocalibration(dev);
385	if (autocalibration < 0) {
386	dev_err(dev, "Failed to read RTC autocalibration\n");
387	sprintf(buf, "0\n");
388	return autocalibration;
389	}
390
391	return sprintf(buf, "%d\n", autocalibration);
392	}
393
394	static DEVICE_ATTR_RW(autocalibration);
395
396	static ssize_t oscillator_store(struct device *dev,
397	struct device_attribute *attr,
398	const char *buf, size_t count)
399	{
400	struct i2c_client *client = to_i2c_client(dev);
401	int retval, flags, rc_mode = 0;
402
403	if (strncmp(buf, "rc", 2) == 0) {
404	rc_mode = 1;
405	} else if (strncmp(buf, "xtal", 4) == 0) {
406	rc_mode = 0;
407	} else {
408	dev_err(dev, "Oscillator selection value outside permitted ones\n");
409	return -EINVAL;
410	}
411
412	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
413	if (flags < 0)
414	return flags;
415
416	if (rc_mode == 0)
417	flags &= ~(ABX8XX_OSC_OSEL);
418	else
419	flags \|= (ABX8XX_OSC_OSEL);
420
421	/* Unlock write access on Oscillator Control register */
422	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
423	ABX8XX_CFG_KEY_OSC);
424	if (retval < 0) {
425	dev_err(dev, "Failed to write CONFIG_KEY register\n");
426	return retval;
427	}
428
429	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
430	if (retval < 0) {
431	dev_err(dev, "Failed to write Oscillator Control register\n");
432	return retval;
433	}
434
435	return retval ? retval : count;
436	}
437
438	static ssize_t oscillator_show(struct device *dev,
439	struct device_attribute attr, char buf)
440	{
441	int rc_mode = 0;
442	struct i2c_client *client = to_i2c_client(dev);
443
444	rc_mode = abx80x_is_rc_mode(client);
445
446	if (rc_mode < 0) {
447	dev_err(dev, "Failed to read RTC oscillator selection\n");
448	sprintf(buf, "\n");
449	return rc_mode;
450	}
451
452	if (rc_mode)
453	return sprintf(buf, "rc\n");
454	else
455	return sprintf(buf, "xtal\n");
456	}
457
458	static DEVICE_ATTR_RW(oscillator);
459
460	static struct attribute *rtc_calib_attrs[] = {
461	&dev_attr_autocalibration.attr,
462	&dev_attr_oscillator.attr,
463	NULL,
464	};
465
466	static const struct attribute_group rtc_calib_attr_group = {
467	.attrs = rtc_calib_attrs,
468	};
469
718a820a AB	470	static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
	471	{
	472	struct i2c_client *client = to_i2c_client(dev);
	473	int err;
	474
	475	if (enabled)
	476	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
	477	(ABX8XX_IRQ_IM_1_4 \|
	478	ABX8XX_IRQ_AIE));
	479	else
	480	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
	481	ABX8XX_IRQ_IM_1_4);
	482	return err;
	483	}
	484
4d61ff6b PDM	485	static const struct rtc_class_ops abx80x_rtc_ops = {
	486	.read_time = abx80x_rtc_read_time,
	487	.set_time = abx80x_rtc_set_time,
718a820a AB	488	.read_alarm = abx80x_read_alarm,
	489	.set_alarm = abx80x_set_alarm,
	490	.alarm_irq_enable = abx80x_alarm_irq_enable,
4d61ff6b PDM	491	};
	492
	493	static int abx80x_dt_trickle_cfg(struct device_node *np)
	494	{
	495	const char *diode;
	496	int trickle_cfg = 0;
	497	int i, ret;
	498	u32 tmp;
	499
	500	ret = of_property_read_string(np, "abracon,tc-diode", &diode);
	501	if (ret)
	502	return ret;
	503
	504	if (!strcmp(diode, "standard"))
	505	trickle_cfg \|= ABX8XX_TRICKLE_STANDARD_DIODE;
	506	else if (!strcmp(diode, "schottky"))
	507	trickle_cfg \|= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
	508	else
	509	return -EINVAL;
	510
	511	ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
	512	if (ret)
	513	return ret;
	514
	515	for (i = 0; i < sizeof(trickle_resistors); i++)
	516	if (trickle_resistors[i] == tmp)
	517	break;
	518
	519	if (i == sizeof(trickle_resistors))
	520	return -EINVAL;
	521
	522	return (trickle_cfg \| i);
	523	}
	524
59a8383a MJ	525	static void rtc_calib_remove_sysfs_group(void *_dev)
	526	{
	527	struct device *dev = _dev;
	528
	529	sysfs_remove_group(&dev->kobj, &rtc_calib_attr_group);
	530	}
	531
4d61ff6b PDM	532	static int abx80x_probe(struct i2c_client *client,
	533	const struct i2c_device_id *id)
	534	{
	535	struct device_node *np = client->dev.of_node;
	536	struct rtc_device *rtc;
	537	int i, data, err, trickle_cfg = -EINVAL;
	538	char buf[7];
	539	unsigned int part = id->driver_data;
	540	unsigned int partnumber;
	541	unsigned int majrev, minrev;
	542	unsigned int lot;
	543	unsigned int wafer;
	544	unsigned int uid;
	545
	546	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
	547	return -ENODEV;
	548
	549	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
	550	sizeof(buf), buf);
	551	if (err < 0) {
	552	dev_err(&client->dev, "Unable to read partnumber\n");
	553	return -EIO;
	554	}
	555
	556	partnumber = (buf[0] << 8) \| buf[1];
	557	majrev = buf[2] >> 3;
	558	minrev = buf[2] & 0x7;
	559	lot = ((buf[4] & 0x80) << 2) \| ((buf[6] & 0x80) << 1) \| buf[3];
	560	uid = ((buf[4] & 0x7f) << 8) \| buf[5];
	561	wafer = (buf[6] & 0x7c) >> 2;
	562	dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
	563	partnumber, majrev, minrev, lot, wafer, uid);
	564
	565	data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
	566	if (data < 0) {
	567	dev_err(&client->dev, "Unable to read control register\n");
	568	return -EIO;
	569	}
	570
	571	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
718a820a AB	572	((data & ~(ABX8XX_CTRL_12_24 \|
718a820a AB	573	ABX8XX_CTRL_ARST)) \|
4d61ff6b PDM	574	ABX8XX_CTRL_WRITE));
	575	if (err < 0) {
	576	dev_err(&client->dev, "Unable to write control register\n");
	577	return -EIO;
	578	}
	579
	580	/* part autodetection */
	581	if (part == ABX80X) {
	582	for (i = 0; abx80x_caps[i].pn; i++)
	583	if (partnumber == abx80x_caps[i].pn)
	584	break;
	585	if (abx80x_caps[i].pn == 0) {
	586	dev_err(&client->dev, "Unknown part: %04x\n",
	587	partnumber);
	588	return -EINVAL;
	589	}
	590	part = i;
	591	}
	592
	593	if (partnumber != abx80x_caps[part].pn) {
	594	dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
	595	partnumber, abx80x_caps[part].pn);
	596	return -EINVAL;
	597	}
	598
	599	if (np && abx80x_caps[part].has_tc)
	600	trickle_cfg = abx80x_dt_trickle_cfg(np);
	601
	602	if (trickle_cfg > 0) {
	603	dev_info(&client->dev, "Enabling trickle charger: %02x\n",
	604	trickle_cfg);
	605	abx80x_enable_trickle_charger(client, trickle_cfg);
	606	}
	607
718a820a AB	608	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL,
	609	BIT(2));
	610	if (err)
	611	return err;
	612
9360a6a8	613	rtc = devm_rtc_allocate_device(&client->dev);
4d61ff6b PDM	614	if (IS_ERR(rtc))
	615	return PTR_ERR(rtc);
	616
9360a6a8 AB	617	rtc->ops = &abx80x_rtc_ops;
9360a6a8 AB	618
4d61ff6b PDM	619	i2c_set_clientdata(client, rtc);
4d61ff6b PDM	620
718a820a AB	621	if (client->irq > 0) {
	622	dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
	623	err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
	624	abx80x_handle_irq,
	625	IRQF_SHARED \| IRQF_ONESHOT,
	626	"abx8xx",
	627	client);
	628	if (err) {
	629	dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
	630	client->irq = 0;
	631	}
	632	}
	633
59a8383a MJ	634	/* Export sysfs entries */
	635	err = sysfs_create_group(&(&client->dev)->kobj, &rtc_calib_attr_group);
	636	if (err) {
	637	dev_err(&client->dev, "Failed to create sysfs group: %d\n",
	638	err);
	639	return err;
	640	}
	641
d8cac8d9 SM	642	err = devm_add_action_or_reset(&client->dev,
	643	rtc_calib_remove_sysfs_group,
	644	&client->dev);
9da32ba6	645	if (err) {
59a8383a MJ	646	dev_err(&client->dev,
	647	"Failed to add sysfs cleanup action: %d\n",
	648	err);
9da32ba6 AB	649	return err;
	650	}
	651
	652	err = rtc_register_device(rtc);
59a8383a	653
d8cac8d9	654	return err;
4d61ff6b PDM	655	}
	656
	657	static int abx80x_remove(struct i2c_client *client)
	658	{
	659	return 0;
	660	}
	661
	662	static const struct i2c_device_id abx80x_id[] = {
	663	{ "abx80x", ABX80X },
	664	{ "ab0801", AB0801 },
	665	{ "ab0803", AB0803 },
	666	{ "ab0804", AB0804 },
	667	{ "ab0805", AB0805 },
	668	{ "ab1801", AB1801 },
	669	{ "ab1803", AB1803 },
	670	{ "ab1804", AB1804 },
	671	{ "ab1805", AB1805 },
fca733a1	672	{ "rv1805", AB1805 },
4d61ff6b PDM	673	{ }
	674	};
	675	MODULE_DEVICE_TABLE(i2c, abx80x_id);
	676
	677	static struct i2c_driver abx80x_driver = {
	678	.driver = {
	679	.name = "rtc-abx80x",
	680	},
	681	.probe = abx80x_probe,
	682	.remove = abx80x_remove,
	683	.id_table = abx80x_id,
	684	};
	685
	686	module_i2c_driver(abx80x_driver);
	687
	688	MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
	689	MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
	690	MODULE_DESCRIPTION("Abracon ABX80X RTC driver");
	691	MODULE_LICENSE("GPL v2");