[linux-block.git] / drivers / rtc / rtc-rx8581.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * An I2C driver for the Epson RX8581 RTC
 *
 * Author: Martyn Welch <martyn.welch@ge.com>
 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
 *
 * Based on: rtc-pcf8563.c (An I2C driver for the Philips PCF8563 RTC)
 * Copyright 2005-06 Tower Technologies
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/bcd.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/log2.h>

#define RX8581_REG_SC		0x00 /* Second in BCD */
#define RX8581_REG_MN		0x01 /* Minute in BCD */
#define RX8581_REG_HR		0x02 /* Hour in BCD */
#define RX8581_REG_DW		0x03 /* Day of Week */
#define RX8581_REG_DM		0x04 /* Day of Month in BCD */
#define RX8581_REG_MO		0x05 /* Month in BCD */
#define RX8581_REG_YR		0x06 /* Year in BCD */
#define RX8581_REG_RAM		0x07 /* RAM */
#define RX8581_REG_AMN		0x08 /* Alarm Min in BCD*/
#define RX8581_REG_AHR		0x09 /* Alarm Hour in BCD */
#define RX8581_REG_ADM		0x0A
#define RX8581_REG_ADW		0x0A
#define RX8581_REG_TMR0		0x0B
#define RX8581_REG_TMR1		0x0C
#define RX8581_REG_EXT		0x0D /* Extension Register */
#define RX8581_REG_FLAG		0x0E /* Flag Register */
#define RX8581_REG_CTRL		0x0F /* Control Register */


/* Flag Register bit definitions */
#define RX8581_FLAG_UF		0x20 /* Update */
#define RX8581_FLAG_TF		0x10 /* Timer */
#define RX8581_FLAG_AF		0x08 /* Alarm */
#define RX8581_FLAG_VLF		0x02 /* Voltage Low */

/* Control Register bit definitions */
#define RX8581_CTRL_UIE		0x20 /* Update Interrupt Enable */
#define RX8581_CTRL_TIE		0x10 /* Timer Interrupt Enable */
#define RX8581_CTRL_AIE		0x08 /* Alarm Interrupt Enable */
#define RX8581_CTRL_STOP	0x02 /* STOP bit */
#define RX8581_CTRL_RESET	0x01 /* RESET bit */

#define RX8571_USER_RAM		0x10
#define RX8571_NVRAM_SIZE	0x10

struct rx8581 {
	struct regmap		*regmap;
	struct rtc_device	*rtc;
};

struct rx85x1_config {
	struct regmap_config regmap;
	unsigned int num_nvram;
};

/*
 * In the routines that deal directly with the rx8581 hardware, we use
 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
 */
static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned char date[7];
	unsigned int data;
	int err;
	struct rx8581 *rx8581 = i2c_get_clientdata(client);

	/* First we ensure that the "update flag" is not set, we read the
	 * time and date then re-read the "update flag". If the update flag
	 * has been set, we know that the time has changed during the read so
	 * we repeat the whole process again.
	 */
	err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);
	if (err < 0)
		return err;

	if (data & RX8581_FLAG_VLF) {
		dev_warn(dev,
			 "low voltage detected, date/time is not reliable.\n");
		return -EINVAL;
	}

	do {
		/* If update flag set, clear it */
		if (data & RX8581_FLAG_UF) {
			err = regmap_write(rx8581->regmap, RX8581_REG_FLAG,
					  data & ~RX8581_FLAG_UF);
			if (err < 0)
				return err;
		}

		/* Now read time and date */
		err = regmap_bulk_read(rx8581->regmap, RX8581_REG_SC, date,
				       sizeof(date));
		if (err < 0)
			return err;

		/* Check flag register */
		err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);
		if (err < 0)
			return err;
	} while (data & RX8581_FLAG_UF);

	dev_dbg(dev, "%s: raw data is sec=%02x, min=%02x, hr=%02x, "
		"wday=%02x, mday=%02x, mon=%02x, year=%02x\n",
		__func__,
		date[0], date[1], date[2], date[3], date[4], date[5], date[6]);

	tm->tm_sec = bcd2bin(date[RX8581_REG_SC] & 0x7F);
	tm->tm_min = bcd2bin(date[RX8581_REG_MN] & 0x7F);
	tm->tm_hour = bcd2bin(date[RX8581_REG_HR] & 0x3F); /* rtc hr 0-23 */
	tm->tm_wday = ilog2(date[RX8581_REG_DW] & 0x7F);
	tm->tm_mday = bcd2bin(date[RX8581_REG_DM] & 0x3F);
	tm->tm_mon = bcd2bin(date[RX8581_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
	tm->tm_year = bcd2bin(date[RX8581_REG_YR]) + 100;

	dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
		"mday=%d, mon=%d, year=%d, wday=%d\n",
		__func__,
		tm->tm_sec, tm->tm_min, tm->tm_hour,
		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

	return 0;
}

static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct i2c_client *client = to_i2c_client(dev);
	int err;
	unsigned char buf[7];
	struct rx8581 *rx8581 = i2c_get_clientdata(client);

	dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, "
		"mday=%d, mon=%d, year=%d, wday=%d\n",
		__func__,
		tm->tm_sec, tm->tm_min, tm->tm_hour,
		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

	/* hours, minutes and seconds */
	buf[RX8581_REG_SC] = bin2bcd(tm->tm_sec);
	buf[RX8581_REG_MN] = bin2bcd(tm->tm_min);
	buf[RX8581_REG_HR] = bin2bcd(tm->tm_hour);

	buf[RX8581_REG_DM] = bin2bcd(tm->tm_mday);

	/* month, 1 - 12 */
	buf[RX8581_REG_MO] = bin2bcd(tm->tm_mon + 1);

	/* year and century */
	buf[RX8581_REG_YR] = bin2bcd(tm->tm_year - 100);
	buf[RX8581_REG_DW] = (0x1 << tm->tm_wday);

	/* Stop the clock */
	err = regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,
				 RX8581_CTRL_STOP, RX8581_CTRL_STOP);
	if (err < 0)
		return err;

	/* write register's data */
	err = regmap_bulk_write(rx8581->regmap, RX8581_REG_SC,
				buf, sizeof(buf));
	if (err < 0)
		return err;

	/* get VLF and clear it */
	err = regmap_update_bits(rx8581->regmap, RX8581_REG_FLAG,
				 RX8581_FLAG_VLF, 0);
	if (err < 0)
		return err;

	/* Restart the clock */
	return regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,
				 RX8581_CTRL_STOP, 0);
}

static const struct rtc_class_ops rx8581_rtc_ops = {
	.read_time	= rx8581_rtc_read_time,
	.set_time	= rx8581_rtc_set_time,
};

static int rx8571_nvram_read(void *priv, unsigned int offset, void *val,
			     size_t bytes)
{
	struct rx8581 *rx8581 = priv;

	return regmap_bulk_read(rx8581->regmap, RX8571_USER_RAM + offset,
				val, bytes);
}

static int rx8571_nvram_write(void *priv, unsigned int offset, void *val,
			      size_t bytes)
{
	struct rx8581 *rx8581 = priv;

	return regmap_bulk_write(rx8581->regmap, RX8571_USER_RAM + offset,
				 val, bytes);
}

static int rx85x1_nvram_read(void *priv, unsigned int offset, void *val,
			     size_t bytes)
{
	struct rx8581 *rx8581 = priv;
	unsigned int tmp_val;
	int ret;

	ret = regmap_read(rx8581->regmap, RX8581_REG_RAM, &tmp_val);
	(*(unsigned char *)val) = (unsigned char) tmp_val;

	return ret;
}

static int rx85x1_nvram_write(void *priv, unsigned int offset, void *val,
			      size_t bytes)
{
	struct rx8581 *rx8581 = priv;
	unsigned char tmp_val;

	tmp_val = *((unsigned char *)val);
	return regmap_write(rx8581->regmap, RX8581_REG_RAM,
				(unsigned int)tmp_val);
}

static const struct rx85x1_config rx8581_config = {
	.regmap = {
		.reg_bits = 8,
		.val_bits = 8,
		.max_register = 0xf,
	},
	.num_nvram = 1
};

static const struct rx85x1_config rx8571_config = {
	.regmap = {
		.reg_bits = 8,
		.val_bits = 8,
		.max_register = 0x1f,
	},
	.num_nvram = 2
};

static int rx8581_probe(struct i2c_client *client)
{
	struct rx8581 *rx8581;
	const struct rx85x1_config *config = &rx8581_config;
	const void *data = of_device_get_match_data(&client->dev);
	static struct nvmem_config nvmem_cfg[] = {
		{
			.name = "rx85x1-",
			.word_size = 1,
			.stride = 1,
			.size = 1,
			.reg_read = rx85x1_nvram_read,
			.reg_write = rx85x1_nvram_write,
		}, {
			.name = "rx8571-",
			.word_size = 1,
			.stride = 1,
			.size = RX8571_NVRAM_SIZE,
			.reg_read = rx8571_nvram_read,
			.reg_write = rx8571_nvram_write,
		},
	};
	int ret, i;

	dev_dbg(&client->dev, "%s\n", __func__);

	if (data)
		config = data;

	rx8581 = devm_kzalloc(&client->dev, sizeof(struct rx8581), GFP_KERNEL);
	if (!rx8581)
		return -ENOMEM;

	i2c_set_clientdata(client, rx8581);

	rx8581->regmap = devm_regmap_init_i2c(client, &config->regmap);
	if (IS_ERR(rx8581->regmap))
		return PTR_ERR(rx8581->regmap);

	rx8581->rtc = devm_rtc_allocate_device(&client->dev);
	if (IS_ERR(rx8581->rtc))
		return PTR_ERR(rx8581->rtc);

	rx8581->rtc->ops = &rx8581_rtc_ops;
	rx8581->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	rx8581->rtc->range_max = RTC_TIMESTAMP_END_2099;
	rx8581->rtc->start_secs = 0;
	rx8581->rtc->set_start_time = true;

	ret = devm_rtc_register_device(rx8581->rtc);

	for (i = 0; i < config->num_nvram; i++) {
		nvmem_cfg[i].priv = rx8581;
		devm_rtc_nvmem_register(rx8581->rtc, &nvmem_cfg[i]);
	}

	return ret;
}

static const struct i2c_device_id rx8581_id[] = {
	{ "rx8581", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rx8581_id);

static const __maybe_unused struct of_device_id rx8581_of_match[] = {
	{ .compatible = "epson,rx8571", .data = &rx8571_config },
	{ .compatible = "epson,rx8581", .data = &rx8581_config },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, rx8581_of_match);

static struct i2c_driver rx8581_driver = {
	.driver		= {
		.name	= "rtc-rx8581",
		.of_match_table = of_match_ptr(rx8581_of_match),
	},
	.probe_new	= rx8581_probe,
	.id_table	= rx8581_id,
};

module_i2c_driver(rx8581_driver);

MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
MODULE_DESCRIPTION("Epson RX-8571/RX-8581 RTC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
a7fa9851 MW	2	/*
	3	* An I2C driver for the Epson RX8581 RTC
	4	*
9756c4da MW	5	* Author: Martyn Welch <martyn.welch@ge.com>
9756c4da MW	6	* Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
a7fa9851	7	*
a7fa9851 MW	8	* Based on: rtc-pcf8563.c (An I2C driver for the Philips PCF8563 RTC)
	9	* Copyright 2005-06 Tower Technologies
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/i2c.h>
	14	#include <linux/bcd.h>
51f896ff BD	15	#include <linux/of.h>
51f896ff BD	16	#include <linux/of_device.h>
94389b28	17	#include <linux/regmap.h>
a7fa9851 MW	18	#include <linux/rtc.h>
	19	#include <linux/log2.h>
	20
a7fa9851 MW	21	#define RX8581_REG_SC 0x00 /* Second in BCD */
	22	#define RX8581_REG_MN 0x01 /* Minute in BCD */
	23	#define RX8581_REG_HR 0x02 /* Hour in BCD */
	24	#define RX8581_REG_DW 0x03 /* Day of Week */
	25	#define RX8581_REG_DM 0x04 /* Day of Month in BCD */
	26	#define RX8581_REG_MO 0x05 /* Month in BCD */
	27	#define RX8581_REG_YR 0x06 /* Year in BCD */
	28	#define RX8581_REG_RAM 0x07 /* RAM */
	29	#define RX8581_REG_AMN 0x08 /* Alarm Min in BCD*/
	30	#define RX8581_REG_AHR 0x09 /* Alarm Hour in BCD */
	31	#define RX8581_REG_ADM 0x0A
	32	#define RX8581_REG_ADW 0x0A
	33	#define RX8581_REG_TMR0 0x0B
	34	#define RX8581_REG_TMR1 0x0C
	35	#define RX8581_REG_EXT 0x0D /* Extension Register */
	36	#define RX8581_REG_FLAG 0x0E /* Flag Register */
	37	#define RX8581_REG_CTRL 0x0F /* Control Register */
	38
	39
	40	/* Flag Register bit definitions */
	41	#define RX8581_FLAG_UF 0x20 /* Update */
	42	#define RX8581_FLAG_TF 0x10 /* Timer */
	43	#define RX8581_FLAG_AF 0x08 /* Alarm */
	44	#define RX8581_FLAG_VLF 0x02 /* Voltage Low */
	45
	46	/* Control Register bit definitions */
	47	#define RX8581_CTRL_UIE 0x20 /* Update Interrupt Enable */
	48	#define RX8581_CTRL_TIE 0x10 /* Timer Interrupt Enable */
	49	#define RX8581_CTRL_AIE 0x08 /* Alarm Interrupt Enable */
	50	#define RX8581_CTRL_STOP 0x02 /* STOP bit */
	51	#define RX8581_CTRL_RESET 0x01 /* RESET bit */
	52
51f896ff BD	53	#define RX8571_USER_RAM 0x10
	54	#define RX8571_NVRAM_SIZE 0x10
	55
d643a49a	56	struct rx8581 {
94389b28	57	struct regmap *regmap;
d643a49a	58	struct rtc_device *rtc;
d643a49a AW	59	};
d643a49a AW	60
51f896ff BD	61	struct rx85x1_config {
	62	struct regmap_config regmap;
	63	unsigned int num_nvram;
	64	};
	65
a7fa9851 MW	66	/*
	67	* In the routines that deal directly with the rx8581 hardware, we use
	68	* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
	69	*/
2d2b300b	70	static int rx8581_rtc_read_time(struct device dev, struct rtc_time tm)
a7fa9851	71	{
2d2b300b	72	struct i2c_client *client = to_i2c_client(dev);
a7fa9851	73	unsigned char date[7];
94389b28 AB	74	unsigned int data;
94389b28 AB	75	int err;
d643a49a	76	struct rx8581 *rx8581 = i2c_get_clientdata(client);
a7fa9851 MW	77
	78	/* First we ensure that the "update flag" is not set, we read the
	79	* time and date then re-read the "update flag". If the update flag
	80	* has been set, we know that the time has changed during the read so
	81	* we repeat the whole process again.
	82	*/
94389b28 AB	83	err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);
	84	if (err < 0)
	85	return err;
a7fa9851	86
6e6111f6 AB	87	if (data & RX8581_FLAG_VLF) {
	88	dev_warn(dev,
	89	"low voltage detected, date/time is not reliable.\n");
	90	return -EINVAL;
	91	}
	92
a7fa9851 MW	93	do {
	94	/* If update flag set, clear it */
	95	if (data & RX8581_FLAG_UF) {
94389b28 AB	96	err = regmap_write(rx8581->regmap, RX8581_REG_FLAG,
	97	data & ~RX8581_FLAG_UF);
	98	if (err < 0)
	99	return err;
a7fa9851 MW	100	}
	101
	102	/* Now read time and date */
94389b28 AB	103	err = regmap_bulk_read(rx8581->regmap, RX8581_REG_SC, date,
	104	sizeof(date));
	105	if (err < 0)
	106	return err;
a7fa9851 MW	107
a7fa9851 MW	108	/* Check flag register */
94389b28 AB	109	err = regmap_read(rx8581->regmap, RX8581_REG_FLAG, &data);
	110	if (err < 0)
	111	return err;
a7fa9851 MW	112	} while (data & RX8581_FLAG_UF);
a7fa9851 MW	113
ed87c6d8	114	dev_dbg(dev, "%s: raw data is sec=%02x, min=%02x, hr=%02x, "
a7fa9851 MW	115	"wday=%02x, mday=%02x, mon=%02x, year=%02x\n",
	116	__func__,
	117	date[0], date[1], date[2], date[3], date[4], date[5], date[6]);
	118
	119	tm->tm_sec = bcd2bin(date[RX8581_REG_SC] & 0x7F);
	120	tm->tm_min = bcd2bin(date[RX8581_REG_MN] & 0x7F);
	121	tm->tm_hour = bcd2bin(date[RX8581_REG_HR] & 0x3F); /* rtc hr 0-23 */
	122	tm->tm_wday = ilog2(date[RX8581_REG_DW] & 0x7F);
	123	tm->tm_mday = bcd2bin(date[RX8581_REG_DM] & 0x3F);
	124	tm->tm_mon = bcd2bin(date[RX8581_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
c6e3c297	125	tm->tm_year = bcd2bin(date[RX8581_REG_YR]) + 100;
a7fa9851	126
ed87c6d8	127	dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
a7fa9851 MW	128	"mday=%d, mon=%d, year=%d, wday=%d\n",
	129	__func__,
	130	tm->tm_sec, tm->tm_min, tm->tm_hour,
	131	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
	132
24f421b7	133	return 0;
a7fa9851 MW	134	}
a7fa9851 MW	135
2d2b300b	136	static int rx8581_rtc_set_time(struct device dev, struct rtc_time tm)
a7fa9851	137	{
2d2b300b	138	struct i2c_client *client = to_i2c_client(dev);
94389b28	139	int err;
a7fa9851	140	unsigned char buf[7];
d643a49a	141	struct rx8581 *rx8581 = i2c_get_clientdata(client);
a7fa9851	142
ed87c6d8	143	dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, "
a7fa9851 MW	144	"mday=%d, mon=%d, year=%d, wday=%d\n",
	145	__func__,
	146	tm->tm_sec, tm->tm_min, tm->tm_hour,
	147	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
	148
	149	/* hours, minutes and seconds */
	150	buf[RX8581_REG_SC] = bin2bcd(tm->tm_sec);
	151	buf[RX8581_REG_MN] = bin2bcd(tm->tm_min);
	152	buf[RX8581_REG_HR] = bin2bcd(tm->tm_hour);
	153
	154	buf[RX8581_REG_DM] = bin2bcd(tm->tm_mday);
	155
	156	/* month, 1 - 12 */
	157	buf[RX8581_REG_MO] = bin2bcd(tm->tm_mon + 1);
	158
	159	/* year and century */
c6e3c297	160	buf[RX8581_REG_YR] = bin2bcd(tm->tm_year - 100);
a7fa9851 MW	161	buf[RX8581_REG_DW] = (0x1 << tm->tm_wday);
	162
	163	/* Stop the clock */
94389b28 AB	164	err = regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,
	165	RX8581_CTRL_STOP, RX8581_CTRL_STOP);
	166	if (err < 0)
	167	return err;
a7fa9851 MW	168
a7fa9851 MW	169	/* write register's data */
94389b28 AB	170	err = regmap_bulk_write(rx8581->regmap, RX8581_REG_SC,
	171	buf, sizeof(buf));
	172	if (err < 0)
	173	return err;
a7fa9851	174
2884fce1	175	/* get VLF and clear it */
94389b28 AB	176	err = regmap_update_bits(rx8581->regmap, RX8581_REG_FLAG,
	177	RX8581_FLAG_VLF, 0);
	178	if (err < 0)
	179	return err;
2884fce1	180
a7fa9851	181	/* Restart the clock */
94389b28 AB	182	return regmap_update_bits(rx8581->regmap, RX8581_REG_CTRL,
94389b28 AB	183	RX8581_CTRL_STOP, 0);
a7fa9851 MW	184	}
a7fa9851 MW	185
a7fa9851 MW	186	static const struct rtc_class_ops rx8581_rtc_ops = {
	187	.read_time = rx8581_rtc_read_time,
	188	.set_time = rx8581_rtc_set_time,
	189	};
	190
51f896ff BD	191	static int rx8571_nvram_read(void priv, unsigned int offset, void val,
51f896ff BD	192	size_t bytes)
a7fa9851	193	{
51f896ff BD	194	struct rx8581 *rx8581 = priv;
	195
	196	return regmap_bulk_read(rx8581->regmap, RX8571_USER_RAM + offset,
	197	val, bytes);
	198	}
	199
	200	static int rx8571_nvram_write(void priv, unsigned int offset, void val,
	201	size_t bytes)
	202	{
	203	struct rx8581 *rx8581 = priv;
	204
	205	return regmap_bulk_write(rx8581->regmap, RX8571_USER_RAM + offset,
	206	val, bytes);
	207	}
	208
	209	static int rx85x1_nvram_read(void priv, unsigned int offset, void val,
	210	size_t bytes)
	211	{
	212	struct rx8581 *rx8581 = priv;
	213	unsigned int tmp_val;
	214	int ret;
	215
	216	ret = regmap_read(rx8581->regmap, RX8581_REG_RAM, &tmp_val);
	217	((unsigned char )val) = (unsigned char) tmp_val;
	218
	219	return ret;
	220	}
	221
	222	static int rx85x1_nvram_write(void priv, unsigned int offset, void val,
	223	size_t bytes)
	224	{
	225	struct rx8581 *rx8581 = priv;
	226	unsigned char tmp_val;
	227
	228	tmp_val = ((unsigned char )val);
	229	return regmap_write(rx8581->regmap, RX8581_REG_RAM,
	230	(unsigned int)tmp_val);
	231	}
	232
	233	static const struct rx85x1_config rx8581_config = {
	234	.regmap = {
94389b28 AB	235	.reg_bits = 8,
	236	.val_bits = 8,
	237	.max_register = 0xf,
51f896ff BD	238	},
	239	.num_nvram = 1
	240	};
	241
	242	static const struct rx85x1_config rx8571_config = {
	243	.regmap = {
	244	.reg_bits = 8,
	245	.val_bits = 8,
	246	.max_register = 0x1f,
	247	},
	248	.num_nvram = 2
	249	};
	250
3f4a3322	251	static int rx8581_probe(struct i2c_client *client)
51f896ff BD	252	{
	253	struct rx8581 *rx8581;
	254	const struct rx85x1_config *config = &rx8581_config;
	255	const void *data = of_device_get_match_data(&client->dev);
	256	static struct nvmem_config nvmem_cfg[] = {
	257	{
	258	.name = "rx85x1-",
	259	.word_size = 1,
	260	.stride = 1,
	261	.size = 1,
	262	.reg_read = rx85x1_nvram_read,
	263	.reg_write = rx85x1_nvram_write,
	264	}, {
	265	.name = "rx8571-",
	266	.word_size = 1,
	267	.stride = 1,
	268	.size = RX8571_NVRAM_SIZE,
	269	.reg_read = rx8571_nvram_read,
	270	.reg_write = rx8571_nvram_write,
	271	},
94389b28	272	};
51f896ff	273	int ret, i;
a7fa9851 MW	274
	275	dev_dbg(&client->dev, "%s\n", __func__);
	276
51f896ff BD	277	if (data)
	278	config = data;
	279
d643a49a AW	280	rx8581 = devm_kzalloc(&client->dev, sizeof(struct rx8581), GFP_KERNEL);
	281	if (!rx8581)
	282	return -ENOMEM;
a7fa9851	283
d643a49a	284	i2c_set_clientdata(client, rx8581);
94389b28	285
51f896ff	286	rx8581->regmap = devm_regmap_init_i2c(client, &config->regmap);
94389b28 AB	287	if (IS_ERR(rx8581->regmap))
94389b28 AB	288	return PTR_ERR(rx8581->regmap);
a7fa9851	289
b8157168 AB	290	rx8581->rtc = devm_rtc_allocate_device(&client->dev);
b8157168 AB	291	if (IS_ERR(rx8581->rtc))
d643a49a	292	return PTR_ERR(rx8581->rtc);
a7fa9851	293
b8157168	294	rx8581->rtc->ops = &rx8581_rtc_ops;
86c54ef6 AB	295	rx8581->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
86c54ef6 AB	296	rx8581->rtc->range_max = RTC_TIMESTAMP_END_2099;
c6e3c297 AB	297	rx8581->rtc->start_secs = 0;
c6e3c297 AB	298	rx8581->rtc->set_start_time = true;
b8157168	299
fdcfd854	300	ret = devm_rtc_register_device(rx8581->rtc);
51f896ff BD	301
	302	for (i = 0; i < config->num_nvram; i++) {
	303	nvmem_cfg[i].priv = rx8581;
3a905c2d	304	devm_rtc_nvmem_register(rx8581->rtc, &nvmem_cfg[i]);
51f896ff BD	305	}
	306
	307	return ret;
a7fa9851 MW	308	}
a7fa9851 MW	309
a7fa9851 MW	310	static const struct i2c_device_id rx8581_id[] = {
	311	{ "rx8581", 0 },
	312	{ }
	313	};
	314	MODULE_DEVICE_TABLE(i2c, rx8581_id);
	315
19408467	316	static const __maybe_unused struct of_device_id rx8581_of_match[] = {
51f896ff BD	317	{ .compatible = "epson,rx8571", .data = &rx8571_config },
	318	{ .compatible = "epson,rx8581", .data = &rx8581_config },
	319	{ /* sentinel */ }
ffbecfbd JMC	320	};
	321	MODULE_DEVICE_TABLE(of, rx8581_of_match);
	322
a7fa9851 MW	323	static struct i2c_driver rx8581_driver = {
	324	.driver = {
	325	.name = "rtc-rx8581",
ffbecfbd	326	.of_match_table = of_match_ptr(rx8581_of_match),
a7fa9851	327	},
3f4a3322	328	.probe_new = rx8581_probe,
a7fa9851 MW	329	.id_table = rx8581_id,
	330	};
	331
0abc9201	332	module_i2c_driver(rx8581_driver);
a7fa9851	333
9756c4da	334	MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
51f896ff	335	MODULE_DESCRIPTION("Epson RX-8571/RX-8581 RTC driver");
a7fa9851	336	MODULE_LICENSE("GPL");