[linux-block.git] / drivers / rtc / rtc-rx8010.c

// 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) {
		unsigned long irqflags = IRQF_TRIGGER_LOW;

		if (dev_fwnode(&client->dev))
			irqflags = 0;

		err = devm_request_threaded_irq(dev, client->irq, NULL,
						rx8010_irq_1_handler,
						irqflags | 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");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
ed13d89b AB	2	/*
	3	* Driver for the Epson RTC module RX-8010 SJ
	4	*
	5	* Copyright(C) Timesys Corporation 2015
	6	* Copyright(C) General Electric Company 2015
ed13d89b AB	7	*/
	8
	9	#include <linux/bcd.h>
	10	#include <linux/bitops.h>
	11	#include <linux/i2c.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
9868bc1c	14	#include <linux/regmap.h>
ed13d89b AB	15	#include <linux/rtc.h>
ed13d89b AB	16
e9e4c2da BG	17	#define RX8010_SEC 0x10
	18	#define RX8010_MIN 0x11
	19	#define RX8010_HOUR 0x12
	20	#define RX8010_WDAY 0x13
	21	#define RX8010_MDAY 0x14
	22	#define RX8010_MONTH 0x15
	23	#define RX8010_YEAR 0x16
	24	#define RX8010_RESV17 0x17
	25	#define RX8010_ALMIN 0x18
	26	#define RX8010_ALHOUR 0x19
	27	#define RX8010_ALWDAY 0x1A
	28	#define RX8010_TCOUNT0 0x1B
	29	#define RX8010_TCOUNT1 0x1C
	30	#define RX8010_EXT 0x1D
	31	#define RX8010_FLAG 0x1E
	32	#define RX8010_CTRL 0x1F
ed13d89b	33	/* 0x20 to 0x2F are user registers */
e9e4c2da BG	34	#define RX8010_RESV30 0x30
	35	#define RX8010_RESV31 0x31
	36	#define RX8010_IRQ 0x32
ed13d89b	37
e9e4c2da	38	#define RX8010_EXT_WADA BIT(3)
ed13d89b	39
e9e4c2da BG	40	#define RX8010_FLAG_VLF BIT(1)
	41	#define RX8010_FLAG_AF BIT(3)
	42	#define RX8010_FLAG_TF BIT(4)
	43	#define RX8010_FLAG_UF BIT(5)
ed13d89b	44
e9e4c2da BG	45	#define RX8010_CTRL_AIE BIT(3)
	46	#define RX8010_CTRL_UIE BIT(5)
	47	#define RX8010_CTRL_STOP BIT(6)
	48	#define RX8010_CTRL_TEST BIT(7)
ed13d89b	49
e9e4c2da	50	#define RX8010_ALARM_AE BIT(7)
ed13d89b AB	51
	52	static const struct i2c_device_id rx8010_id[] = {
	53	{ "rx8010", 0 },
	54	{ }
	55	};
	56	MODULE_DEVICE_TABLE(i2c, rx8010_id);
	57
782d3ebf	58	static const __maybe_unused struct of_device_id rx8010_of_match[] = {
81b779ce JMC	59	{ .compatible = "epson,rx8010" },
	60	{ }
	61	};
	62	MODULE_DEVICE_TABLE(of, rx8010_of_match);
	63
ed13d89b	64	struct rx8010_data {
9868bc1c	65	struct regmap *regs;
ed13d89b AB	66	struct rtc_device *rtc;
ed13d89b AB	67	u8 ctrlreg;
ed13d89b AB	68	};
	69
	70	static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
	71	{
	72	struct i2c_client *client = dev_id;
	73	struct rx8010_data *rx8010 = i2c_get_clientdata(client);
9868bc1c	74	int flagreg, err;
ed13d89b	75
2dbbedb9	76	rtc_lock(rx8010->rtc);
ed13d89b	77
9868bc1c BG	78	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
9868bc1c BG	79	if (err) {
2dbbedb9	80	rtc_unlock(rx8010->rtc);
ed13d89b AB	81	return IRQ_NONE;
	82	}
	83
	84	if (flagreg & RX8010_FLAG_VLF)
	85	dev_warn(&client->dev, "Frequency stop detected\n");
	86
	87	if (flagreg & RX8010_FLAG_TF) {
	88	flagreg &= ~RX8010_FLAG_TF;
	89	rtc_update_irq(rx8010->rtc, 1, RTC_PF \| RTC_IRQF);
	90	}
	91
	92	if (flagreg & RX8010_FLAG_AF) {
	93	flagreg &= ~RX8010_FLAG_AF;
	94	rtc_update_irq(rx8010->rtc, 1, RTC_AF \| RTC_IRQF);
	95	}
	96
	97	if (flagreg & RX8010_FLAG_UF) {
	98	flagreg &= ~RX8010_FLAG_UF;
	99	rtc_update_irq(rx8010->rtc, 1, RTC_UF \| RTC_IRQF);
	100	}
	101
9868bc1c	102	err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg);
2dbbedb9	103	rtc_unlock(rx8010->rtc);
9868bc1c	104	return err ? IRQ_NONE : IRQ_HANDLED;
ed13d89b AB	105	}
	106
	107	static int rx8010_get_time(struct device dev, struct rtc_time dt)
	108	{
	109	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
f702699c	110	u8 date[RX8010_YEAR - RX8010_SEC + 1];
75677971	111	int flagreg, err;
ed13d89b	112
9868bc1c BG	113	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
	114	if (err)
	115	return err;
ed13d89b AB	116
	117	if (flagreg & RX8010_FLAG_VLF) {
	118	dev_warn(dev, "Frequency stop detected\n");
	119	return -EINVAL;
	120	}
	121
9868bc1c BG	122	err = regmap_bulk_read(rx8010->regs, RX8010_SEC, date, sizeof(date));
	123	if (err)
	124	return err;
ed13d89b AB	125
	126	dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
	127	dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
	128	dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
	129	dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
	130	dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
	131	dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
	132	dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);
	133
22652ba7	134	return 0;
ed13d89b AB	135	}
	136
	137	static int rx8010_set_time(struct device dev, struct rtc_time dt)
	138	{
	139	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
f702699c	140	u8 date[RX8010_YEAR - RX8010_SEC + 1];
9868bc1c	141	int err;
ed13d89b	142
ed13d89b	143	/* set STOP bit before changing clock/calendar */
9868bc1c BG	144	err = regmap_set_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
9868bc1c BG	145	if (err)
13952c9e	146	return err;
ed13d89b AB	147
	148	date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
	149	date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
	150	date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
	151	date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
	152	date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
	153	date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
	154	date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);
	155
9868bc1c BG	156	err = regmap_bulk_write(rx8010->regs, RX8010_SEC, date, sizeof(date));
9868bc1c BG	157	if (err)
13952c9e	158	return err;
ed13d89b AB	159
ed13d89b AB	160	/* clear STOP bit after changing clock/calendar */
9868bc1c BG	161	err = regmap_clear_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP);
9868bc1c BG	162	if (err)
13952c9e	163	return err;
ed13d89b	164
9868bc1c BG	165	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_VLF);
	166	if (err)
	167	return err;
ed13d89b	168
ed13d89b AB	169	return 0;
	170	}
	171
ba1bcafb	172	static int rx8010_init(struct device *dev)
ed13d89b	173	{
9868bc1c	174	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
ed13d89b	175	u8 ctrl[2];
b3ff7fd6	176	int need_clear = 0, err;
ed13d89b AB	177
ed13d89b AB	178	/* Initialize reserved registers as specified in datasheet */
9868bc1c BG	179	err = regmap_write(rx8010->regs, RX8010_RESV17, 0xD8);
9868bc1c BG	180	if (err)
ed13d89b AB	181	return err;
ed13d89b AB	182
9868bc1c BG	183	err = regmap_write(rx8010->regs, RX8010_RESV30, 0x00);
9868bc1c BG	184	if (err)
ed13d89b AB	185	return err;
ed13d89b AB	186
9868bc1c BG	187	err = regmap_write(rx8010->regs, RX8010_RESV31, 0x08);
9868bc1c BG	188	if (err)
ed13d89b AB	189	return err;
ed13d89b AB	190
9868bc1c BG	191	err = regmap_write(rx8010->regs, RX8010_IRQ, 0x00);
9868bc1c BG	192	if (err)
ed13d89b AB	193	return err;
ed13d89b AB	194
9868bc1c BG	195	err = regmap_bulk_read(rx8010->regs, RX8010_FLAG, ctrl, 2);
	196	if (err)
	197	return err;
ed13d89b AB	198
ed13d89b AB	199	if (ctrl[0] & RX8010_FLAG_VLF)
9868bc1c	200	dev_warn(dev, "Frequency stop was detected\n");
ed13d89b AB	201
ed13d89b AB	202	if (ctrl[0] & RX8010_FLAG_AF) {
9868bc1c	203	dev_warn(dev, "Alarm was detected\n");
ed13d89b AB	204	need_clear = 1;
	205	}
	206
	207	if (ctrl[0] & RX8010_FLAG_TF)
	208	need_clear = 1;
	209
	210	if (ctrl[0] & RX8010_FLAG_UF)
	211	need_clear = 1;
	212
	213	if (need_clear) {
	214	ctrl[0] &= ~(RX8010_FLAG_AF \| RX8010_FLAG_TF \| RX8010_FLAG_UF);
9868bc1c BG	215	err = regmap_write(rx8010->regs, RX8010_FLAG, ctrl[0]);
9868bc1c BG	216	if (err)
ed13d89b AB	217	return err;
	218	}
	219
	220	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
	221
804a6cfe	222	return 0;
ed13d89b AB	223	}
	224
	225	static int rx8010_read_alarm(struct device dev, struct rtc_wkalrm t)
	226	{
	227	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
ed13d89b	228	u8 alarmvals[3];
75677971	229	int flagreg, err;
ed13d89b	230
9868bc1c BG	231	err = regmap_bulk_read(rx8010->regs, RX8010_ALMIN, alarmvals, 3);
	232	if (err)
	233	return err;
ed13d89b	234
9868bc1c BG	235	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
	236	if (err)
	237	return err;
ed13d89b AB	238
	239	t->time.tm_sec = 0;
	240	t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
	241	t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
	242
56d86a7e	243	if (!(alarmvals[2] & RX8010_ALARM_AE))
ed13d89b AB	244	t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);
ed13d89b AB	245
ed13d89b AB	246	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
	247	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
	248
804a6cfe	249	return 0;
ed13d89b AB	250	}
	251
	252	static int rx8010_set_alarm(struct device dev, struct rtc_wkalrm t)
	253	{
ed13d89b AB	254	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
ed13d89b AB	255	u8 alarmvals[3];
9868bc1c	256	int err;
ed13d89b AB	257
	258	if (rx8010->ctrlreg & (RX8010_CTRL_AIE \| RX8010_CTRL_UIE)) {
	259	rx8010->ctrlreg &= ~(RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
9868bc1c BG	260	err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
9868bc1c BG	261	if (err)
ed13d89b	262	return err;
ed13d89b AB	263	}
ed13d89b AB	264
9868bc1c BG	265	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
9868bc1c BG	266	if (err)
ed13d89b AB	267	return err;
	268
	269	alarmvals[0] = bin2bcd(t->time.tm_min);
	270	alarmvals[1] = bin2bcd(t->time.tm_hour);
	271	alarmvals[2] = bin2bcd(t->time.tm_mday);
	272
9868bc1c BG	273	err = regmap_bulk_write(rx8010->regs, RX8010_ALMIN, alarmvals, 2);
9868bc1c BG	274	if (err)
ed13d89b AB	275	return err;
ed13d89b AB	276
9868bc1c BG	277	err = regmap_clear_bits(rx8010->regs, RX8010_EXT, RX8010_EXT_WADA);
9868bc1c BG	278	if (err)
ed13d89b AB	279	return err;
	280
	281	if (alarmvals[2] == 0)
	282	alarmvals[2] \|= RX8010_ALARM_AE;
	283
9868bc1c BG	284	err = regmap_write(rx8010->regs, RX8010_ALWDAY, alarmvals[2]);
9868bc1c BG	285	if (err)
ed13d89b AB	286	return err;
	287
	288	if (t->enabled) {
	289	if (rx8010->rtc->uie_rtctimer.enabled)
	290	rx8010->ctrlreg \|= RX8010_CTRL_UIE;
	291	if (rx8010->rtc->aie_timer.enabled)
	292	rx8010->ctrlreg \|=
	293	(RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
	294
9868bc1c BG	295	err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
9868bc1c BG	296	if (err)
ed13d89b AB	297	return err;
	298	}
	299
	300	return 0;
	301	}
	302
	303	static int rx8010_alarm_irq_enable(struct device *dev,
	304	unsigned int enabled)
	305	{
ed13d89b	306	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
9868bc1c	307	int err;
ed13d89b	308	u8 ctrl;
ed13d89b AB	309
	310	ctrl = rx8010->ctrlreg;
	311
	312	if (enabled) {
	313	if (rx8010->rtc->uie_rtctimer.enabled)
	314	ctrl \|= RX8010_CTRL_UIE;
	315	if (rx8010->rtc->aie_timer.enabled)
	316	ctrl \|= (RX8010_CTRL_AIE \| RX8010_CTRL_UIE);
	317	} else {
	318	if (!rx8010->rtc->uie_rtctimer.enabled)
	319	ctrl &= ~RX8010_CTRL_UIE;
	320	if (!rx8010->rtc->aie_timer.enabled)
	321	ctrl &= ~RX8010_CTRL_AIE;
	322	}
	323
9868bc1c BG	324	err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF);
9868bc1c BG	325	if (err)
ed13d89b AB	326	return err;
	327
	328	if (ctrl != rx8010->ctrlreg) {
	329	rx8010->ctrlreg = ctrl;
9868bc1c BG	330	err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg);
9868bc1c BG	331	if (err)
ed13d89b AB	332	return err;
	333	}
	334
	335	return 0;
	336	}
	337
	338	static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	339	{
ed13d89b	340	struct rx8010_data *rx8010 = dev_get_drvdata(dev);
9868bc1c	341	int tmp, flagreg, err;
ed13d89b AB	342
	343	switch (cmd) {
	344	case RTC_VL_READ:
9868bc1c BG	345	err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg);
	346	if (err)
	347	return err;
ed13d89b	348
8049c113 AB	349	tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
8049c113 AB	350	return put_user(tmp, (unsigned int __user *)arg);
ed13d89b	351
ed13d89b AB	352	default:
	353	return -ENOIOCTLCMD;
	354	}
	355	}
	356
aaaea29c	357	static const struct rtc_class_ops rx8010_rtc_ops = {
d3b14296 BG	358	.read_time = rx8010_get_time,
	359	.set_time = rx8010_set_time,
	360	.ioctl = rx8010_ioctl,
	361	.read_alarm = rx8010_read_alarm,
	362	.set_alarm = rx8010_set_alarm,
	363	.alarm_irq_enable = rx8010_alarm_irq_enable,
	364	};
	365
9868bc1c BG	366	static const struct regmap_config rx8010_regmap_config = {
	367	.name = "rx8010-rtc",
	368	.reg_bits = 8,
	369	.val_bits = 8,
	370	};
	371
cee015d9	372	static int rx8010_probe(struct i2c_client *client)
ed13d89b	373	{
955a123c	374	struct device *dev = &client->dev;
ed13d89b AB	375	struct rx8010_data *rx8010;
	376	int err = 0;
	377
666f2141	378	rx8010 = devm_kzalloc(dev, sizeof(*rx8010), GFP_KERNEL);
ed13d89b AB	379	if (!rx8010)
	380	return -ENOMEM;
	381
ed13d89b AB	382	i2c_set_clientdata(client, rx8010);
ed13d89b AB	383
9868bc1c BG	384	rx8010->regs = devm_regmap_init_i2c(client, &rx8010_regmap_config);
	385	if (IS_ERR(rx8010->regs))
	386	return PTR_ERR(rx8010->regs);
	387
ba1bcafb	388	err = rx8010_init(dev);
ed13d89b AB	389	if (err)
	390	return err;
	391
0ce62778 BG	392	rx8010->rtc = devm_rtc_allocate_device(dev);
	393	if (IS_ERR(rx8010->rtc))
	394	return PTR_ERR(rx8010->rtc);
	395
ed13d89b	396	if (client->irq > 0) {
4bbdced5 AB	397	unsigned long irqflags = IRQF_TRIGGER_LOW;
	398
	399	if (dev_fwnode(&client->dev))
	400	irqflags = 0;
	401
955a123c	402	err = devm_request_threaded_irq(dev, client->irq, NULL,
ed13d89b	403	rx8010_irq_1_handler,
4bbdced5	404	irqflags \| IRQF_ONESHOT,
ed13d89b	405	"rx8010", client);
ed13d89b	406	if (err) {
955a123c	407	dev_err(dev, "unable to request IRQ\n");
d3b14296	408	return err;
ed13d89b	409	}
d3b14296	410	} else {
aaaea29c	411	clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features);
ed13d89b AB	412	}
ed13d89b AB	413
aaaea29c	414	rx8010->rtc->ops = &rx8010_rtc_ops;
ed13d89b	415	rx8010->rtc->max_user_freq = 1;
2fc1af30 BG	416	rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
2fc1af30 BG	417	rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099;
ed13d89b	418
fdcfd854	419	return devm_rtc_register_device(rx8010->rtc);
ed13d89b AB	420	}
	421
	422	static struct i2c_driver rx8010_driver = {
	423	.driver = {
	424	.name = "rtc-rx8010",
81b779ce	425	.of_match_table = of_match_ptr(rx8010_of_match),
ed13d89b	426	},
cee015d9	427	.probe_new = rx8010_probe,
ed13d89b AB	428	.id_table = rx8010_id,
	429	};
	430
	431	module_i2c_driver(rx8010_driver);
	432
	433	MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
	434	MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
	435	MODULE_LICENSE("GPL v2");