drivers/rtc/rtc-rx8010.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Driver for the Epson RTC module RX-8010 SJ
  *
  * Copyright(C) Timesys Corporation 2015
  * Copyright(C) General Electric Company 2015
  */

 #include <linux/bcd.h>
 #include <linux/bitops.h>
 #include <linux/i2c.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/rtc.h>

 #define RX8010_SEC		0x10
 #define RX8010_MIN		0x11
 #define RX8010_HOUR		0x12
 #define RX8010_WDAY		0x13
 #define RX8010_MDAY		0x14
 #define RX8010_MONTH		0x15
 #define RX8010_YEAR		0x16
 #define RX8010_RESV17		0x17
 #define RX8010_ALMIN		0x18
 #define RX8010_ALHOUR		0x19
 #define RX8010_ALWDAY		0x1A
 #define RX8010_TCOUNT0		0x1B
 #define RX8010_TCOUNT1		0x1C
 #define RX8010_EXT		0x1D
 #define RX8010_FLAG		0x1E
 #define RX8010_CTRL		0x1F
 /* 0x20 to 0x2F are user registers */
 #define RX8010_RESV30		0x30
 #define RX8010_RESV31		0x31
 #define RX8010_IRQ		0x32

 #define RX8010_EXT_WADA		BIT(3)

 #define RX8010_FLAG_VLF		BIT(1)
 #define RX8010_FLAG_AF		BIT(3)
 #define RX8010_FLAG_TF		BIT(4)
 #define RX8010_FLAG_UF		BIT(5)

 #define RX8010_CTRL_AIE		BIT(3)
 #define RX8010_CTRL_UIE		BIT(5)
 #define RX8010_CTRL_STOP	BIT(6)
 #define RX8010_CTRL_TEST	BIT(7)

 #define RX8010_ALARM_AE		BIT(7)

 static const struct i2c_device_id rx8010_id[] = {
 	{ "rx8010", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, rx8010_id);

 static const __maybe_unused struct of_device_id rx8010_of_match[] = {
 	{ .compatible = "epson,rx8010" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, rx8010_of_match);

 struct rx8010_data {
 	struct regmap *regs;
 	struct rtc_device *rtc;
 	u8 ctrlreg;
 };

 static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
 {
 	struct i2c_client *client = dev_id;
 	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
 	int flagreg, err;

 	rtc_lock(rx8010->rtc);

 	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
 	if (err) {
 		rtc_unlock(rx8010->rtc);
 		return IRQ_NONE;
 	}

 	if (flagreg & RX8010_FLAG_VLF)
 		dev_warn(&client->dev, "Frequency stop detected\n");

 	if (flagreg & RX8010_FLAG_TF) {
 		flagreg &= ~RX8010_FLAG_TF;
 		rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF);
 	}

 	if (flagreg & RX8010_FLAG_AF) {
 		flagreg &= ~RX8010_FLAG_AF;
 		rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF);
 	}

 	if (flagreg & RX8010_FLAG_UF) {
 		flagreg &= ~RX8010_FLAG_UF;
 		rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF);
 	}

 	err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg);
 	rtc_unlock(rx8010->rtc);
 	return err ? IRQ_NONE : IRQ_HANDLED;
 }

 static int rx8010_get_time(struct device *dev, struct rtc_time *dt)
 {
 	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
 	u8 date[RX8010_YEAR - RX8010_SEC + 1];
 	int flagreg, err;

 	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
 	if (err)
 		return err;

 	if (flagreg & RX8010_FLAG_VLF) {
 		dev_warn(dev, "Frequency stop detected\n");
 		return -EINVAL;
 	}

 	err = regmap_bulk_read(rx8010->regs, RX8010_SEC, date, sizeof(date));
 	if (err)
 		return err;

 	dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
 	dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
 	dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
 	dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
 	dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
 	dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
 	dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);

 	return 0;
 }

 static int rx8010_set_time(struct device *dev, struct rtc_time *dt)
 {
 	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
 	u8 date[RX8010_YEAR - RX8010_SEC + 1];
 	int err;

 	/* set STOP bit before changing clock/calendar */
 	err = regmap_set_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
 	if (err)
 		return err;

 	date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
 	date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
 	date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
 	date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
 	date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
 	date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
 	date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);

 	err = regmap_bulk_write(rx8010->regs, RX8010_SEC, date, sizeof(date));
 	if (err)
 		return err;

 	/* clear STOP bit after changing clock/calendar */
 	err = regmap_clear_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
 	if (err)
 		return err;

 	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_VLF);
 	if (err)
 		return err;

 	return 0;
 }

 static int rx8010_init(struct device *dev)
 {
 	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
 	u8 ctrl[2];
 	int need_clear = 0, err;

 	/* Initialize reserved registers as specified in datasheet */
 	err = regmap_write(rx8010->regs, RX8010_RESV17, 0xD8);
 	if (err)
 		return err;

 	err = regmap_write(rx8010->regs, RX8010_RESV30, 0x00);
 	if (err)
 		return err;

 	err = regmap_write(rx8010->regs, RX8010_RESV31, 0x08);
 	if (err)
 		return err;

 	err = regmap_write(rx8010->regs, RX8010_IRQ, 0x00);
 	if (err)
 		return err;

 	err = regmap_bulk_read(rx8010->regs, RX8010_FLAG, ctrl, 2);
 	if (err)
 		return err;

 	if (ctrl[0] & RX8010_FLAG_VLF)
 		dev_warn(dev, "Frequency stop was detected\n");

 	if (ctrl[0] & RX8010_FLAG_AF) {
 		dev_warn(dev, "Alarm was detected\n");
 		need_clear = 1;
 	}

 	if (ctrl[0] & RX8010_FLAG_TF)
 		need_clear = 1;

 	if (ctrl[0] & RX8010_FLAG_UF)
 		need_clear = 1;

 	if (need_clear) {
 		ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
 		err = regmap_write(rx8010->regs, RX8010_FLAG, ctrl[0]);
 		if (err)
 			return err;
 	}

 	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);

 	return 0;
 }

 static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
 	u8 alarmvals[3];
 	int flagreg, err;

 	err = regmap_bulk_read(rx8010->regs, RX8010_ALMIN, alarmvals, 3);
 	if (err)
 		return err;

 	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
 	if (err)
 		return err;

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

 	if (!(alarmvals[2] & RX8010_ALARM_AE))
 		t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);

 	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
 	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;

 	return 0;
 }

 static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
 	u8 alarmvals[3];
 	int err;

 	if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) {
 		rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
 		err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
 		if (err)
 			return err;
 	}

 	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
 	if (err)
 		return err;

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

 	err = regmap_bulk_write(rx8010->regs, RX8010_ALMIN, alarmvals, 2);
 	if (err)
 		return err;

 	err = regmap_clear_bits(rx8010->regs, RX8010_EXT, RX8010_EXT_WADA);
 	if (err)
 		return err;

 	if (alarmvals[2] == 0)
 		alarmvals[2] |= RX8010_ALARM_AE;

 	err = regmap_write(rx8010->regs, RX8010_ALWDAY, alarmvals[2]);
 	if (err)
 		return err;

 	if (t->enabled) {
 		if (rx8010->rtc->uie_rtctimer.enabled)
 			rx8010->ctrlreg |= RX8010_CTRL_UIE;
 		if (rx8010->rtc->aie_timer.enabled)
 			rx8010->ctrlreg |=
 				(RX8010_CTRL_AIE | RX8010_CTRL_UIE);

 		err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
 		if (err)
 			return err;
 	}

 	return 0;
 }

 static int rx8010_alarm_irq_enable(struct device *dev,
 				   unsigned int enabled)
 {
 	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
 	int err;
 	u8 ctrl;

 	ctrl = rx8010->ctrlreg;

 	if (enabled) {
 		if (rx8010->rtc->uie_rtctimer.enabled)
 			ctrl |= RX8010_CTRL_UIE;
 		if (rx8010->rtc->aie_timer.enabled)
 			ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
 	} else {
 		if (!rx8010->rtc->uie_rtctimer.enabled)
 			ctrl &= ~RX8010_CTRL_UIE;
 		if (!rx8010->rtc->aie_timer.enabled)
 			ctrl &= ~RX8010_CTRL_AIE;
 	}

 	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
 	if (err)
 		return err;

 	if (ctrl != rx8010->ctrlreg) {
 		rx8010->ctrlreg = ctrl;
 		err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
 		if (err)
 			return err;
 	}

 	return 0;
 }

 static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 {
 	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
 	int tmp, flagreg, err;

 	switch (cmd) {
 	case RTC_VL_READ:
 		err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
 		if (err)
 			return err;

 		tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
 		return put_user(tmp, (unsigned int __user *)arg);

 	default:
 		return -ENOIOCTLCMD;
 	}
 }

 static const struct rtc_class_ops rx8010_rtc_ops = {
 	.read_time = rx8010_get_time,
 	.set_time = rx8010_set_time,
 	.ioctl = rx8010_ioctl,
 	.read_alarm = rx8010_read_alarm,
 	.set_alarm = rx8010_set_alarm,
 	.alarm_irq_enable = rx8010_alarm_irq_enable,
 };

 static const struct regmap_config rx8010_regmap_config = {
 	.name = "rx8010-rtc",
 	.reg_bits = 8,
 	.val_bits = 8,
 };

 static int rx8010_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct rx8010_data *rx8010;
 	int err = 0;

 	rx8010 = devm_kzalloc(dev, sizeof(*rx8010), GFP_KERNEL);
 	if (!rx8010)
 		return -ENOMEM;

 	i2c_set_clientdata(client, rx8010);

 	rx8010->regs = devm_regmap_init_i2c(client, &rx8010_regmap_config);
 	if (IS_ERR(rx8010->regs))
 		return PTR_ERR(rx8010->regs);

 	err = rx8010_init(dev);
 	if (err)
 		return err;

 	rx8010->rtc = devm_rtc_allocate_device(dev);
 	if (IS_ERR(rx8010->rtc))
 		return PTR_ERR(rx8010->rtc);

 	if (client->irq > 0) {
 		dev_info(dev, "IRQ %d supplied\n", client->irq);
 		err = devm_request_threaded_irq(dev, client->irq, NULL,
 						rx8010_irq_1_handler,
 						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 						"rx8010", client);
 		if (err) {
 			dev_err(dev, "unable to request IRQ\n");
 			return err;
 		}
 	} else {
 		clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features);
 	}

 	rx8010->rtc->ops = &rx8010_rtc_ops;
 	rx8010->rtc->max_user_freq = 1;
 	rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099;

 	return devm_rtc_register_device(rx8010->rtc);
 }

 static struct i2c_driver rx8010_driver = {
 	.driver = {
 		.name = "rtc-rx8010",
 		.of_match_table = of_match_ptr(rx8010_of_match),
 	},
 	.probe_new	= rx8010_probe,
 	.id_table	= rx8010_id,
 };

 module_i2c_driver(rx8010_driver);

 MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
 MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Driver for the Epson RTC module RX-8010 SJ
	*
	* Copyright(C) Timesys Corporation 2015
	* Copyright(C) General Electric Company 2015
	*/

	#include <linux/bcd.h>
	#include <linux/bitops.h>
	#include <linux/i2c.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/regmap.h>
	#include <linux/rtc.h>

	#define RX8010_SEC 0x10
	#define RX8010_MIN 0x11
	#define RX8010_HOUR 0x12
	#define RX8010_WDAY 0x13
	#define RX8010_MDAY 0x14
	#define RX8010_MONTH 0x15
	#define RX8010_YEAR 0x16
	#define RX8010_RESV17 0x17
	#define RX8010_ALMIN 0x18
	#define RX8010_ALHOUR 0x19
	#define RX8010_ALWDAY 0x1A
	#define RX8010_TCOUNT0 0x1B
	#define RX8010_TCOUNT1 0x1C
	#define RX8010_EXT 0x1D
	#define RX8010_FLAG 0x1E
	#define RX8010_CTRL 0x1F
	/* 0x20 to 0x2F are user registers */
	#define RX8010_RESV30 0x30
	#define RX8010_RESV31 0x31
	#define RX8010_IRQ 0x32

	#define RX8010_EXT_WADA BIT(3)

	#define RX8010_FLAG_VLF BIT(1)
	#define RX8010_FLAG_AF BIT(3)
	#define RX8010_FLAG_TF BIT(4)
	#define RX8010_FLAG_UF BIT(5)

	#define RX8010_CTRL_AIE BIT(3)
	#define RX8010_CTRL_UIE BIT(5)
	#define RX8010_CTRL_STOP BIT(6)
	#define RX8010_CTRL_TEST BIT(7)

	#define RX8010_ALARM_AE BIT(7)

	static const struct i2c_device_id rx8010_id[] = {
	{ "rx8010", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, rx8010_id);

	static const __maybe_unused struct of_device_id rx8010_of_match[] = {
	{ .compatible = "epson,rx8010" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, rx8010_of_match);

	struct rx8010_data {
	struct regmap *regs;
	struct rtc_device *rtc;
	u8 ctrlreg;
	};

	static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
	{
	struct i2c_client *client = dev_id;
	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
	int flagreg, err;

	rtc_lock(rx8010->rtc);

	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
	if (err) {
	rtc_unlock(rx8010->rtc);
	return IRQ_NONE;
	}

	if (flagreg & RX8010_FLAG_VLF)
	dev_warn(&client->dev, "Frequency stop detected\n");

	if (flagreg & RX8010_FLAG_TF) {
	flagreg &= ~RX8010_FLAG_TF;
	rtc_update_irq(rx8010->rtc, 1, RTC_PF \| RTC_IRQF);
	}

	if (flagreg & RX8010_FLAG_AF) {
	flagreg &= ~RX8010_FLAG_AF;
	rtc_update_irq(rx8010->rtc, 1, RTC_AF \| RTC_IRQF);
	}

	if (flagreg & RX8010_FLAG_UF) {
	flagreg &= ~RX8010_FLAG_UF;
	rtc_update_irq(rx8010->rtc, 1, RTC_UF \| RTC_IRQF);
	}

	err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg);
	rtc_unlock(rx8010->rtc);
	return err ? IRQ_NONE : IRQ_HANDLED;
	}

	static int rx8010_get_time(struct device dev, struct rtc_time dt)
	{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 date[RX8010_YEAR - RX8010_SEC + 1];
	int flagreg, err;

	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
	if (err)
	return err;

	if (flagreg & RX8010_FLAG_VLF) {
	dev_warn(dev, "Frequency stop detected\n");
	return -EINVAL;
	}

	err = regmap_bulk_read(rx8010->regs, RX8010_SEC, date, sizeof(date));
	if (err)
	return err;

	dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
	dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
	dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
	dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
	dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
	dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
	dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);

	return 0;
	}

	static int rx8010_set_time(struct device dev, struct rtc_time dt)
	{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 date[RX8010_YEAR - RX8010_SEC + 1];
	int err;

	/* set STOP bit before changing clock/calendar */
	err = regmap_set_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
	if (err)
	return err;

	date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
	date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
	date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
	date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
	date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
	date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
	date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);

	err = regmap_bulk_write(rx8010->regs, RX8010_SEC, date, sizeof(date));
	if (err)
	return err;

	/* clear STOP bit after changing clock/calendar */
	err = regmap_clear_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
	if (err)
	return err;

	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_VLF);
	if (err)
	return err;

	return 0;
	}

	static int rx8010_init(struct device *dev)
	{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 ctrl[2];
	int need_clear = 0, err;

	/* Initialize reserved registers as specified in datasheet */
	err = regmap_write(rx8010->regs, RX8010_RESV17, 0xD8);
	if (err)
	return err;

	err = regmap_write(rx8010->regs, RX8010_RESV30, 0x00);
	if (err)
	return err;

	err = regmap_write(rx8010->regs, RX8010_RESV31, 0x08);
	if (err)
	return err;

	err = regmap_write(rx8010->regs, RX8010_IRQ, 0x00);
	if (err)
	return err;

	err = regmap_bulk_read(rx8010->regs, RX8010_FLAG, ctrl, 2);
	if (err)
	return err;

	if (ctrl[0] & RX8010_FLAG_VLF)
	dev_warn(dev, "Frequency stop was detected\n");

	if (ctrl[0] & RX8010_FLAG_AF) {
	dev_warn(dev, "Alarm was detected\n");
	need_clear = 1;
	}

	if (ctrl[0] & RX8010_FLAG_TF)
	need_clear = 1;

	if (ctrl[0] & RX8010_FLAG_UF)
	need_clear = 1;

	if (need_clear) {
	ctrl[0] &= ~(RX8010_FLAG_AF \| RX8010_FLAG_TF \| RX8010_FLAG_UF);
	err = regmap_write(rx8010->regs, RX8010_FLAG, ctrl[0]);
	if (err)
	return err;
	}

	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);

	return 0;
	}

	static int rx8010_read_alarm(struct device dev, struct rtc_wkalrm t)
	{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 alarmvals[3];
	int flagreg, err;

	err = regmap_bulk_read(rx8010->regs, RX8010_ALMIN, alarmvals, 3);
	if (err)
	return err;

	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
	if (err)
	return err;

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

	if (!(alarmvals[2] & RX8010_ALARM_AE))
	t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);

	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;

	return 0;
	}

	static int rx8010_set_alarm(struct device dev, struct rtc_wkalrm t)
	{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	u8 alarmvals[3];
	int err;

	if (rx8010->ctrlreg & (RX8010_CTRL_AIE \| RX8010_CTRL_UIE)) {
	rx8010->ctrlreg &= ~(RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
	err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
	if (err)
	return err;
	}

	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
	if (err)
	return err;

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

	err = regmap_bulk_write(rx8010->regs, RX8010_ALMIN, alarmvals, 2);
	if (err)
	return err;

	err = regmap_clear_bits(rx8010->regs, RX8010_EXT, RX8010_EXT_WADA);
	if (err)
	return err;

	if (alarmvals[2] == 0)
	alarmvals[2] \|= RX8010_ALARM_AE;

	err = regmap_write(rx8010->regs, RX8010_ALWDAY, alarmvals[2]);
	if (err)
	return err;

	if (t->enabled) {
	if (rx8010->rtc->uie_rtctimer.enabled)
	rx8010->ctrlreg \|= RX8010_CTRL_UIE;
	if (rx8010->rtc->aie_timer.enabled)
	rx8010->ctrlreg \|=
	(RX8010_CTRL_AIE \| RX8010_CTRL_UIE);

	err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
	if (err)
	return err;
	}

	return 0;
	}

	static int rx8010_alarm_irq_enable(struct device *dev,
	unsigned int enabled)
	{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	int err;
	u8 ctrl;

	ctrl = rx8010->ctrlreg;

	if (enabled) {
	if (rx8010->rtc->uie_rtctimer.enabled)
	ctrl \|= RX8010_CTRL_UIE;
	if (rx8010->rtc->aie_timer.enabled)
	ctrl \|= (RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
	} else {
	if (!rx8010->rtc->uie_rtctimer.enabled)
	ctrl &= ~RX8010_CTRL_UIE;
	if (!rx8010->rtc->aie_timer.enabled)
	ctrl &= ~RX8010_CTRL_AIE;
	}

	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
	if (err)
	return err;

	if (ctrl != rx8010->ctrlreg) {
	rx8010->ctrlreg = ctrl;
	err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
	if (err)
	return err;
	}

	return 0;
	}

	static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	{
	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
	int tmp, flagreg, err;

	switch (cmd) {
	case RTC_VL_READ:
	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
	if (err)
	return err;

	tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
	return put_user(tmp, (unsigned int __user *)arg);

	default:
	return -ENOIOCTLCMD;
	}
	}

	static const struct rtc_class_ops rx8010_rtc_ops = {
	.read_time = rx8010_get_time,
	.set_time = rx8010_set_time,
	.ioctl = rx8010_ioctl,
	.read_alarm = rx8010_read_alarm,
	.set_alarm = rx8010_set_alarm,
	.alarm_irq_enable = rx8010_alarm_irq_enable,
	};

	static const struct regmap_config rx8010_regmap_config = {
	.name = "rx8010-rtc",
	.reg_bits = 8,
	.val_bits = 8,
	};

	static int rx8010_probe(struct i2c_client *client)
	{
	struct device *dev = &client->dev;
	struct rx8010_data *rx8010;
	int err = 0;

	rx8010 = devm_kzalloc(dev, sizeof(*rx8010), GFP_KERNEL);
	if (!rx8010)
	return -ENOMEM;

	i2c_set_clientdata(client, rx8010);

	rx8010->regs = devm_regmap_init_i2c(client, &rx8010_regmap_config);
	if (IS_ERR(rx8010->regs))
	return PTR_ERR(rx8010->regs);

	err = rx8010_init(dev);
	if (err)
	return err;

	rx8010->rtc = devm_rtc_allocate_device(dev);
	if (IS_ERR(rx8010->rtc))
	return PTR_ERR(rx8010->rtc);

	if (client->irq > 0) {
	dev_info(dev, "IRQ %d supplied\n", client->irq);
	err = devm_request_threaded_irq(dev, client->irq, NULL,
	rx8010_irq_1_handler,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	"rx8010", client);
	if (err) {
	dev_err(dev, "unable to request IRQ\n");
	return err;
	}
	} else {
	clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features);
	}

	rx8010->rtc->ops = &rx8010_rtc_ops;
	rx8010->rtc->max_user_freq = 1;
	rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099;

	return devm_rtc_register_device(rx8010->rtc);
	}

	static struct i2c_driver rx8010_driver = {
	.driver = {
	.name = "rtc-rx8010",
	.of_match_table = of_match_ptr(rx8010_of_match),
	},
	.probe_new = rx8010_probe,
	.id_table = rx8010_id,
	};

	module_i2c_driver(rx8010_driver);

	MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
	MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
	MODULE_LICENSE("GPL v2");