[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;

	err = rtc_valid_tm(tm);
	if (err < 0)
		dev_err(&client->dev, "retrieved date/time is not valid.\n");

	return err;
}

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_device_register(&client->dev, "abx8xx",
				       &abx80x_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc))
		return PTR_ERR(rtc);

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

	return 0;
}

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
	175	err = rtc_valid_tm(tm);
	176	if (err < 0)
	177	dev_err(&client->dev, "retrieved date/time is not valid.\n");
	178
	179	return err;
	180	}
	181
	182	static int abx80x_rtc_set_time(struct device dev, struct rtc_time tm)
	183	{
	184	struct i2c_client *client = to_i2c_client(dev);
	185	unsigned char buf[8];
ee087744	186	int err, flags;
4d61ff6b PDM	187
	188	if (tm->tm_year < 100)
	189	return -EINVAL;
	190
	191	buf[ABX8XX_REG_HTH] = 0;
	192	buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec);
	193	buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min);
	194	buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour);
	195	buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday);
	196	buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
	197	buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
	198	buf[ABX8XX_REG_WD] = tm->tm_wday;
	199
	200	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
	201	sizeof(buf), buf);
	202	if (err < 0) {
	203	dev_err(&client->dev, "Unable to write to date registers\n");
	204	return -EIO;
	205	}
	206
ee087744 MJ	207	/* Clear the OF bit of Oscillator Status Register */
	208	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
	209	if (flags < 0)
	210	return flags;
	211
	212	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
	213	flags & ~ABX8XX_OSS_OF);
	214	if (err < 0) {
	215	dev_err(&client->dev, "Unable to write oscillator status register\n");
	216	return err;
	217	}
	218
4d61ff6b PDM	219	return 0;
	220	}
	221
718a820a AB	222	static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
	223	{
	224	struct i2c_client *client = dev_id;
	225	struct rtc_device *rtc = i2c_get_clientdata(client);
	226	int status;
	227
	228	status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
	229	if (status < 0)
	230	return IRQ_NONE;
	231
	232	if (status & ABX8XX_STATUS_AF)
	233	rtc_update_irq(rtc, 1, RTC_AF \| RTC_IRQF);
	234
	235	i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
	236
	237	return IRQ_HANDLED;
	238	}
	239
	240	static int abx80x_read_alarm(struct device dev, struct rtc_wkalrm t)
	241	{
	242	struct i2c_client *client = to_i2c_client(dev);
	243	unsigned char buf[7];
	244
	245	int irq_mask, err;
	246
	247	if (client->irq <= 0)
	248	return -EINVAL;
	249
	250	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
	251	sizeof(buf), buf);
	252	if (err)
	253	return err;
	254
	255	irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ);
	256	if (irq_mask < 0)
	257	return irq_mask;
	258
	259	t->time.tm_sec = bcd2bin(buf[0] & 0x7F);
	260	t->time.tm_min = bcd2bin(buf[1] & 0x7F);
	261	t->time.tm_hour = bcd2bin(buf[2] & 0x3F);
	262	t->time.tm_mday = bcd2bin(buf[3] & 0x3F);
	263	t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1;
	264	t->time.tm_wday = buf[5] & 0x7;
	265
	266	t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE);
	267	t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled;
	268
	269	return err;
	270	}
	271
	272	static int abx80x_set_alarm(struct device dev, struct rtc_wkalrm t)
	273	{
	274	struct i2c_client *client = to_i2c_client(dev);
	275	u8 alarm[6];
	276	int err;
	277
	278	if (client->irq <= 0)
	279	return -EINVAL;
	280
	281	alarm[0] = 0x0;
	282	alarm[1] = bin2bcd(t->time.tm_sec);
	283	alarm[2] = bin2bcd(t->time.tm_min);
	284	alarm[3] = bin2bcd(t->time.tm_hour);
	285	alarm[4] = bin2bcd(t->time.tm_mday);
286	alarm[5] = bin2bcd(t->time.tm_mon + 1);
287
288	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
289	sizeof(alarm), alarm);
290	if (err < 0) {
291	dev_err(&client->dev, "Unable to write alarm registers\n");
292	return -EIO;
293	}
294
295	if (t->enabled) {
296	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
297	(ABX8XX_IRQ_IM_1_4 \|
298	ABX8XX_IRQ_AIE));
299	if (err)
300	return err;
301	}
302
303	return 0;
304	}
305
59a8383a MJ	306	static int abx80x_rtc_set_autocalibration(struct device *dev,
	307	int autocalibration)
	308	{
	309	struct i2c_client *client = to_i2c_client(dev);
	310	int retval, flags = 0;
	311
	312	if ((autocalibration != 0) && (autocalibration != 1024) &&
	313	(autocalibration != 512)) {
	314	dev_err(dev, "autocalibration value outside permitted range\n");
	315	return -EINVAL;
	316	}
	317
	318	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
	319	if (flags < 0)
	320	return flags;
	321
	322	if (autocalibration == 0) {
	323	flags &= ~(ABX8XX_OSC_ACAL_512 \| ABX8XX_OSC_ACAL_1024);
	324	} else if (autocalibration == 1024) {
	325	/* 1024 autocalibration is 0x10 */
	326	flags \|= ABX8XX_OSC_ACAL_1024;
	327	flags &= ~(ABX8XX_OSC_ACAL_512);
	328	} else {
	329	/* 512 autocalibration is 0x11 */
	330	flags \|= (ABX8XX_OSC_ACAL_1024 \| ABX8XX_OSC_ACAL_512);
	331	}
	332
	333	/* Unlock write access to Oscillator Control Register */
	334	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
	335	ABX8XX_CFG_KEY_OSC);
	336	if (retval < 0) {
	337	dev_err(dev, "Failed to write CONFIG_KEY register\n");
	338	return retval;
	339	}
	340
	341	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
	342
	343	return retval;
	344	}
	345
	346	static int abx80x_rtc_get_autocalibration(struct device *dev)
	347	{
	348	struct i2c_client *client = to_i2c_client(dev);
	349	int flags = 0, autocalibration;
	350
	351	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
	352	if (flags < 0)
	353	return flags;
	354
	355	if (flags & ABX8XX_OSC_ACAL_512)
	356	autocalibration = 512;
	357	else if (flags & ABX8XX_OSC_ACAL_1024)
	358	autocalibration = 1024;
	359	else
	360	autocalibration = 0;
	361
	362	return autocalibration;
	363	}
	364
	365	static ssize_t autocalibration_store(struct device *dev,
	366	struct device_attribute *attr,
	367	const char *buf, size_t count)
	368	{
	369	int retval;
370	unsigned long autocalibration = 0;
371
372	retval = kstrtoul(buf, 10, &autocalibration);
373	if (retval < 0) {
374	dev_err(dev, "Failed to store RTC autocalibration attribute\n");
375	return -EINVAL;
376	}
377
378	retval = abx80x_rtc_set_autocalibration(dev, autocalibration);
379
380	return retval ? retval : count;
381	}
382
383	static ssize_t autocalibration_show(struct device *dev,
384	struct device_attribute attr, char buf)
385	{
386	int autocalibration = 0;
387
388	autocalibration = abx80x_rtc_get_autocalibration(dev);
389	if (autocalibration < 0) {
390	dev_err(dev, "Failed to read RTC autocalibration\n");
391	sprintf(buf, "0\n");
392	return autocalibration;
393	}
394
395	return sprintf(buf, "%d\n", autocalibration);
396	}
397
398	static DEVICE_ATTR_RW(autocalibration);
399
400	static ssize_t oscillator_store(struct device *dev,
401	struct device_attribute *attr,
402	const char *buf, size_t count)
403	{
404	struct i2c_client *client = to_i2c_client(dev);
405	int retval, flags, rc_mode = 0;
406
407	if (strncmp(buf, "rc", 2) == 0) {
408	rc_mode = 1;
409	} else if (strncmp(buf, "xtal", 4) == 0) {
410	rc_mode = 0;
411	} else {
412	dev_err(dev, "Oscillator selection value outside permitted ones\n");
413	return -EINVAL;
414	}
415
416	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
417	if (flags < 0)
418	return flags;
419
420	if (rc_mode == 0)
421	flags &= ~(ABX8XX_OSC_OSEL);
422	else
423	flags \|= (ABX8XX_OSC_OSEL);
424
425	/* Unlock write access on Oscillator Control register */
426	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
427	ABX8XX_CFG_KEY_OSC);
428	if (retval < 0) {
429	dev_err(dev, "Failed to write CONFIG_KEY register\n");
430	return retval;
431	}
432
433	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
434	if (retval < 0) {
435	dev_err(dev, "Failed to write Oscillator Control register\n");
436	return retval;
437	}
438
439	return retval ? retval : count;
440	}
441
442	static ssize_t oscillator_show(struct device *dev,
443	struct device_attribute attr, char buf)
444	{
445	int rc_mode = 0;
446	struct i2c_client *client = to_i2c_client(dev);
447
448	rc_mode = abx80x_is_rc_mode(client);
449
450	if (rc_mode < 0) {
451	dev_err(dev, "Failed to read RTC oscillator selection\n");
452	sprintf(buf, "\n");
453	return rc_mode;
454	}
455
456	if (rc_mode)
457	return sprintf(buf, "rc\n");
458	else
459	return sprintf(buf, "xtal\n");
460	}
461
462	static DEVICE_ATTR_RW(oscillator);
463
464	static struct attribute *rtc_calib_attrs[] = {
465	&dev_attr_autocalibration.attr,
466	&dev_attr_oscillator.attr,
467	NULL,
468	};
469
470	static const struct attribute_group rtc_calib_attr_group = {
471	.attrs = rtc_calib_attrs,
472	};
473
718a820a AB	474	static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
	475	{
	476	struct i2c_client *client = to_i2c_client(dev);
	477	int err;
	478
	479	if (enabled)
	480	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
	481	(ABX8XX_IRQ_IM_1_4 \|
	482	ABX8XX_IRQ_AIE));
	483	else
	484	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
	485	ABX8XX_IRQ_IM_1_4);
	486	return err;
	487	}
	488
4d61ff6b PDM	489	static const struct rtc_class_ops abx80x_rtc_ops = {
	490	.read_time = abx80x_rtc_read_time,
	491	.set_time = abx80x_rtc_set_time,
718a820a AB	492	.read_alarm = abx80x_read_alarm,
	493	.set_alarm = abx80x_set_alarm,
	494	.alarm_irq_enable = abx80x_alarm_irq_enable,
4d61ff6b PDM	495	};
	496
	497	static int abx80x_dt_trickle_cfg(struct device_node *np)
	498	{
	499	const char *diode;
	500	int trickle_cfg = 0;
	501	int i, ret;
	502	u32 tmp;
	503
	504	ret = of_property_read_string(np, "abracon,tc-diode", &diode);
	505	if (ret)
	506	return ret;
	507
	508	if (!strcmp(diode, "standard"))
	509	trickle_cfg \|= ABX8XX_TRICKLE_STANDARD_DIODE;
	510	else if (!strcmp(diode, "schottky"))
	511	trickle_cfg \|= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
	512	else
	513	return -EINVAL;
	514
	515	ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
	516	if (ret)
	517	return ret;
	518
	519	for (i = 0; i < sizeof(trickle_resistors); i++)
	520	if (trickle_resistors[i] == tmp)
	521	break;
	522
	523	if (i == sizeof(trickle_resistors))
	524	return -EINVAL;
	525
	526	return (trickle_cfg \| i);
	527	}
	528
59a8383a MJ	529	static void rtc_calib_remove_sysfs_group(void *_dev)
	530	{
	531	struct device *dev = _dev;
	532
	533	sysfs_remove_group(&dev->kobj, &rtc_calib_attr_group);
	534	}
	535
4d61ff6b PDM	536	static int abx80x_probe(struct i2c_client *client,
	537	const struct i2c_device_id *id)
	538	{
	539	struct device_node *np = client->dev.of_node;
	540	struct rtc_device *rtc;
	541	int i, data, err, trickle_cfg = -EINVAL;
	542	char buf[7];
	543	unsigned int part = id->driver_data;
	544	unsigned int partnumber;
	545	unsigned int majrev, minrev;
	546	unsigned int lot;
	547	unsigned int wafer;
	548	unsigned int uid;
	549
	550	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
	551	return -ENODEV;
	552
	553	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
	554	sizeof(buf), buf);
	555	if (err < 0) {
	556	dev_err(&client->dev, "Unable to read partnumber\n");
	557	return -EIO;
	558	}
	559
	560	partnumber = (buf[0] << 8) \| buf[1];
	561	majrev = buf[2] >> 3;
	562	minrev = buf[2] & 0x7;
	563	lot = ((buf[4] & 0x80) << 2) \| ((buf[6] & 0x80) << 1) \| buf[3];
	564	uid = ((buf[4] & 0x7f) << 8) \| buf[5];
	565	wafer = (buf[6] & 0x7c) >> 2;
	566	dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
	567	partnumber, majrev, minrev, lot, wafer, uid);
	568
	569	data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
	570	if (data < 0) {
	571	dev_err(&client->dev, "Unable to read control register\n");
	572	return -EIO;
	573	}
	574
	575	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
718a820a AB	576	((data & ~(ABX8XX_CTRL_12_24 \|
718a820a AB	577	ABX8XX_CTRL_ARST)) \|
4d61ff6b PDM	578	ABX8XX_CTRL_WRITE));
	579	if (err < 0) {
	580	dev_err(&client->dev, "Unable to write control register\n");
	581	return -EIO;
	582	}
	583
	584	/* part autodetection */
	585	if (part == ABX80X) {
	586	for (i = 0; abx80x_caps[i].pn; i++)
	587	if (partnumber == abx80x_caps[i].pn)
	588	break;
	589	if (abx80x_caps[i].pn == 0) {
	590	dev_err(&client->dev, "Unknown part: %04x\n",
	591	partnumber);
	592	return -EINVAL;
	593	}
	594	part = i;
	595	}
	596
	597	if (partnumber != abx80x_caps[part].pn) {
	598	dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
	599	partnumber, abx80x_caps[part].pn);
	600	return -EINVAL;
	601	}
	602
	603	if (np && abx80x_caps[part].has_tc)
	604	trickle_cfg = abx80x_dt_trickle_cfg(np);
	605
	606	if (trickle_cfg > 0) {
	607	dev_info(&client->dev, "Enabling trickle charger: %02x\n",
	608	trickle_cfg);
	609	abx80x_enable_trickle_charger(client, trickle_cfg);
	610	}
	611
718a820a AB	612	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL,
	613	BIT(2));
	614	if (err)
	615	return err;
	616
	617	rtc = devm_rtc_device_register(&client->dev, "abx8xx",
4d61ff6b PDM	618	&abx80x_rtc_ops, THIS_MODULE);
	619
	620	if (IS_ERR(rtc))
	621	return PTR_ERR(rtc);
	622
	623	i2c_set_clientdata(client, rtc);
	624
718a820a AB	625	if (client->irq > 0) {
	626	dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
	627	err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
	628	abx80x_handle_irq,
	629	IRQF_SHARED \| IRQF_ONESHOT,
	630	"abx8xx",
	631	client);
	632	if (err) {
	633	dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
	634	client->irq = 0;
	635	}
	636	}
	637
59a8383a MJ	638	/* Export sysfs entries */
	639	err = sysfs_create_group(&(&client->dev)->kobj, &rtc_calib_attr_group);
	640	if (err) {
	641	dev_err(&client->dev, "Failed to create sysfs group: %d\n",
	642	err);
	643	return err;
	644	}
	645
	646	err = devm_add_action(&client->dev, rtc_calib_remove_sysfs_group,
	647	&client->dev);
	648	if (err) {
	649	rtc_calib_remove_sysfs_group(&client->dev);
	650	dev_err(&client->dev,
	651	"Failed to add sysfs cleanup action: %d\n",
	652	err);
	653	return err;
	654	}
	655
4d61ff6b PDM	656	return 0;
	657	}
	658
	659	static int abx80x_remove(struct i2c_client *client)
	660	{
	661	return 0;
	662	}
	663
	664	static const struct i2c_device_id abx80x_id[] = {
	665	{ "abx80x", ABX80X },
	666	{ "ab0801", AB0801 },
	667	{ "ab0803", AB0803 },
	668	{ "ab0804", AB0804 },
	669	{ "ab0805", AB0805 },
	670	{ "ab1801", AB1801 },
	671	{ "ab1803", AB1803 },
	672	{ "ab1804", AB1804 },
	673	{ "ab1805", AB1805 },
fca733a1	674	{ "rv1805", AB1805 },
4d61ff6b PDM	675	{ }
	676	};
	677	MODULE_DEVICE_TABLE(i2c, abx80x_id);
	678
	679	static struct i2c_driver abx80x_driver = {
	680	.driver = {
	681	.name = "rtc-abx80x",
	682	},
	683	.probe = abx80x_probe,
	684	.remove = abx80x_remove,
	685	.id_table = abx80x_id,
	686	};
	687
	688	module_i2c_driver(abx80x_driver);
	689
	690	MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
	691	MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
	692	MODULE_DESCRIPTION("Abracon ABX80X RTC driver");
	693	MODULE_LICENSE("GPL v2");