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

/*
 * An I2C driver for the Epson RX8581 RTC
 *
 * Author: Martyn Welch <martyn.welch@ge.com>
 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
 *
 * 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.
 *
 * 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/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 */

struct rx8581 {
	struct i2c_client	*client;
	struct rtc_device	*rtc;
	s32 (*read_block_data)(const struct i2c_client *client, u8 command,
				u8 length, u8 *values);
	s32 (*write_block_data)(const struct i2c_client *client, u8 command,
				u8 length, const u8 *values);
};

static struct i2c_driver rx8581_driver;

static int rx8581_read_block_data(const struct i2c_client *client, u8 command,
					u8 length, u8 *values)
{
	s32 i, data;

	for (i = 0; i < length; i++) {
		data = i2c_smbus_read_byte_data(client, command + i);
		if (data < 0)
			return data;
		values[i] = data;
	}
	return i;
}

static int rx8581_write_block_data(const struct i2c_client *client, u8 command,
					u8 length, const u8 *values)
{
	s32 i, ret;

	for (i = 0; i < length; i++) {
		ret = i2c_smbus_write_byte_data(client, command + i,
						values[i]);
		if (ret < 0)
			return ret;
	}
	return length;
}

/*
 * 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_get_datetime(struct i2c_client *client, struct rtc_time *tm)
{
	unsigned char date[7];
	int data, 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.
	 */
	data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
	if (data < 0) {
		dev_err(&client->dev, "Unable to read device flags\n");
		return -EIO;
	}

	do {
		/* If update flag set, clear it */
		if (data & RX8581_FLAG_UF) {
			err = i2c_smbus_write_byte_data(client,
				RX8581_REG_FLAG, (data & ~RX8581_FLAG_UF));
			if (err != 0) {
				dev_err(&client->dev, "Unable to write device flags\n");
				return -EIO;
			}
		}

		/* Now read time and date */
		err = rx8581->read_block_data(client, RX8581_REG_SC,
			7, date);
		if (err < 0) {
			dev_err(&client->dev, "Unable to read date\n");
			return -EIO;
		}

		/* Check flag register */
		data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
		if (data < 0) {
			dev_err(&client->dev, "Unable to read device flags\n");
			return -EIO;
		}
	} while (data & RX8581_FLAG_UF);

	if (data & RX8581_FLAG_VLF)
		dev_info(&client->dev,
			"low voltage detected, date/time is not reliable.\n");

	dev_dbg(&client->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]);
	if (tm->tm_year < 70)
		tm->tm_year += 100;	/* assume we are in 1970...2069 */


	dev_dbg(&client->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_set_datetime(struct i2c_client *client, struct rtc_time *tm)
{
	int data, err;
	unsigned char buf[7];
	struct rx8581 *rx8581 = i2c_get_clientdata(client);

	dev_dbg(&client->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 */
	data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
	if (data < 0) {
		dev_err(&client->dev, "Unable to read control register\n");
		return -EIO;
	}

	err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
		(data | RX8581_CTRL_STOP));
	if (err < 0) {
		dev_err(&client->dev, "Unable to write control register\n");
		return -EIO;
	}

	/* write register's data */
	err = rx8581->write_block_data(client, RX8581_REG_SC, 7, buf);
	if (err < 0) {
		dev_err(&client->dev, "Unable to write to date registers\n");
		return -EIO;
	}

	/* get VLF and clear it */
	data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
	if (data < 0) {
		dev_err(&client->dev, "Unable to read flag register\n");
		return -EIO;
	}

	err = i2c_smbus_write_byte_data(client, RX8581_REG_FLAG,
		(data & ~(RX8581_FLAG_VLF)));
	if (err != 0) {
		dev_err(&client->dev, "Unable to write flag register\n");
		return -EIO;
	}

	/* Restart the clock */
	data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
	if (data < 0) {
		dev_err(&client->dev, "Unable to read control register\n");
		return -EIO;
	}

	err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
		(data & ~(RX8581_CTRL_STOP)));
	if (err != 0) {
		dev_err(&client->dev, "Unable to write control register\n");
		return -EIO;
	}

	return 0;
}

static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	return rx8581_get_datetime(to_i2c_client(dev), tm);
}

static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	return rx8581_set_datetime(to_i2c_client(dev), tm);
}

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

static int rx8581_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct rx8581	  *rx8581;

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

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)
		&& !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
		return -EIO;

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

	i2c_set_clientdata(client, rx8581);
	rx8581->client = client;

	if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
		rx8581->read_block_data = i2c_smbus_read_i2c_block_data;
		rx8581->write_block_data = i2c_smbus_write_i2c_block_data;
	} else {
		rx8581->read_block_data = rx8581_read_block_data;
		rx8581->write_block_data = rx8581_write_block_data;
	}

	rx8581->rtc = devm_rtc_device_register(&client->dev,
		rx8581_driver.driver.name, &rx8581_rtc_ops, THIS_MODULE);

	if (IS_ERR(rx8581->rtc)) {
		dev_err(&client->dev,
			"unable to register the class device\n");
		return PTR_ERR(rx8581->rtc);
	}

	return 0;
}

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

static const struct of_device_id rx8581_of_match[] = {
	{ .compatible = "epson,rx8581" },
	{ }
};
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		= rx8581_probe,
	.id_table	= rx8581_id,
};

module_i2c_driver(rx8581_driver);

MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
MODULE_DESCRIPTION("Epson RX-8581 RTC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
a7fa9851 MW	1	/*
	2	* An I2C driver for the Epson RX8581 RTC
	3	*
9756c4da MW	4	* Author: Martyn Welch <martyn.welch@ge.com>
9756c4da MW	5	* Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
a7fa9851 MW	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* Based on: rtc-pcf8563.c (An I2C driver for the Philips PCF8563 RTC)
	12	* Copyright 2005-06 Tower Technologies
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/i2c.h>
	17	#include <linux/bcd.h>
	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
d643a49a AW	53	struct rx8581 {
	54	struct i2c_client *client;
	55	struct rtc_device *rtc;
	56	s32 (read_block_data)(const struct i2c_client client, u8 command,
	57	u8 length, u8 *values);
	58	s32 (write_block_data)(const struct i2c_client client, u8 command,
	59	u8 length, const u8 *values);
	60	};
	61
a7fa9851 MW	62	static struct i2c_driver rx8581_driver;
a7fa9851 MW	63
d643a49a AW	64	static int rx8581_read_block_data(const struct i2c_client *client, u8 command,
	65	u8 length, u8 *values)
	66	{
	67	s32 i, data;
	68
	69	for (i = 0; i < length; i++) {
	70	data = i2c_smbus_read_byte_data(client, command + i);
	71	if (data < 0)
	72	return data;
	73	values[i] = data;
	74	}
	75	return i;
	76	}
	77
	78	static int rx8581_write_block_data(const struct i2c_client *client, u8 command,
	79	u8 length, const u8 *values)
	80	{
	81	s32 i, ret;
	82
	83	for (i = 0; i < length; i++) {
	84	ret = i2c_smbus_write_byte_data(client, command + i,
	85	values[i]);
	86	if (ret < 0)
	87	return ret;
	88	}
	89	return length;
	90	}
	91
a7fa9851 MW	92	/*
	93	* In the routines that deal directly with the rx8581 hardware, we use
	94	* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
	95	*/
	96	static int rx8581_get_datetime(struct i2c_client client, struct rtc_time tm)
	97	{
	98	unsigned char date[7];
	99	int data, err;
d643a49a	100	struct rx8581 *rx8581 = i2c_get_clientdata(client);
a7fa9851 MW	101
	102	/* First we ensure that the "update flag" is not set, we read the
	103	* time and date then re-read the "update flag". If the update flag
	104	* has been set, we know that the time has changed during the read so
	105	* we repeat the whole process again.
	106	*/
	107	data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
	108	if (data < 0) {
	109	dev_err(&client->dev, "Unable to read device flags\n");
	110	return -EIO;
	111	}
	112
	113	do {
	114	/* If update flag set, clear it */
	115	if (data & RX8581_FLAG_UF) {
	116	err = i2c_smbus_write_byte_data(client,
	117	RX8581_REG_FLAG, (data & ~RX8581_FLAG_UF));
	118	if (err != 0) {
d643a49a	119	dev_err(&client->dev, "Unable to write device flags\n");
a7fa9851 MW	120	return -EIO;
	121	}
	122	}
	123
	124	/* Now read time and date */
d643a49a	125	err = rx8581->read_block_data(client, RX8581_REG_SC,
a7fa9851 MW	126	7, date);
	127	if (err < 0) {
	128	dev_err(&client->dev, "Unable to read date\n");
	129	return -EIO;
	130	}
	131
	132	/* Check flag register */
	133	data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
	134	if (data < 0) {
	135	dev_err(&client->dev, "Unable to read device flags\n");
	136	return -EIO;
	137	}
	138	} while (data & RX8581_FLAG_UF);
	139
	140	if (data & RX8581_FLAG_VLF)
	141	dev_info(&client->dev,
	142	"low voltage detected, date/time is not reliable.\n");
	143
	144	dev_dbg(&client->dev,
	145	"%s: raw data is sec=%02x, min=%02x, hr=%02x, "
	146	"wday=%02x, mday=%02x, mon=%02x, year=%02x\n",
	147	__func__,
	148	date[0], date[1], date[2], date[3], date[4], date[5], date[6]);
	149
	150	tm->tm_sec = bcd2bin(date[RX8581_REG_SC] & 0x7F);
	151	tm->tm_min = bcd2bin(date[RX8581_REG_MN] & 0x7F);
	152	tm->tm_hour = bcd2bin(date[RX8581_REG_HR] & 0x3F); /* rtc hr 0-23 */
	153	tm->tm_wday = ilog2(date[RX8581_REG_DW] & 0x7F);
	154	tm->tm_mday = bcd2bin(date[RX8581_REG_DM] & 0x3F);
	155	tm->tm_mon = bcd2bin(date[RX8581_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
	156	tm->tm_year = bcd2bin(date[RX8581_REG_YR]);
	157	if (tm->tm_year < 70)
	158	tm->tm_year += 100; /* assume we are in 1970...2069 */
	159
	160
	161	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
	162	"mday=%d, mon=%d, year=%d, wday=%d\n",
	163	__func__,
	164	tm->tm_sec, tm->tm_min, tm->tm_hour,
	165	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
	166
24f421b7	167	return 0;
a7fa9851 MW	168	}
	169
	170	static int rx8581_set_datetime(struct i2c_client client, struct rtc_time tm)
	171	{
	172	int data, err;
	173	unsigned char buf[7];
d643a49a	174	struct rx8581 *rx8581 = i2c_get_clientdata(client);
a7fa9851 MW	175
	176	dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
	177	"mday=%d, mon=%d, year=%d, wday=%d\n",
	178	__func__,
	179	tm->tm_sec, tm->tm_min, tm->tm_hour,
	180	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
	181
	182	/* hours, minutes and seconds */
	183	buf[RX8581_REG_SC] = bin2bcd(tm->tm_sec);
	184	buf[RX8581_REG_MN] = bin2bcd(tm->tm_min);
	185	buf[RX8581_REG_HR] = bin2bcd(tm->tm_hour);
	186
	187	buf[RX8581_REG_DM] = bin2bcd(tm->tm_mday);
	188
	189	/* month, 1 - 12 */
	190	buf[RX8581_REG_MO] = bin2bcd(tm->tm_mon + 1);
	191
	192	/* year and century */
	193	buf[RX8581_REG_YR] = bin2bcd(tm->tm_year % 100);
	194	buf[RX8581_REG_DW] = (0x1 << tm->tm_wday);
	195
	196	/* Stop the clock */
	197	data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
	198	if (data < 0) {
	199	dev_err(&client->dev, "Unable to read control register\n");
	200	return -EIO;
	201	}
	202
2884fce1	203	err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
a7fa9851 MW	204	(data \| RX8581_CTRL_STOP));
	205	if (err < 0) {
	206	dev_err(&client->dev, "Unable to write control register\n");
	207	return -EIO;
	208	}
	209
	210	/* write register's data */
d643a49a	211	err = rx8581->write_block_data(client, RX8581_REG_SC, 7, buf);
a7fa9851 MW	212	if (err < 0) {
	213	dev_err(&client->dev, "Unable to write to date registers\n");
	214	return -EIO;
	215	}
	216
2884fce1 RM	217	/* get VLF and clear it */
	218	data = i2c_smbus_read_byte_data(client, RX8581_REG_FLAG);
	219	if (data < 0) {
	220	dev_err(&client->dev, "Unable to read flag register\n");
	221	return -EIO;
	222	}
	223
	224	err = i2c_smbus_write_byte_data(client, RX8581_REG_FLAG,
	225	(data & ~(RX8581_FLAG_VLF)));
	226	if (err != 0) {
	227	dev_err(&client->dev, "Unable to write flag register\n");
	228	return -EIO;
	229	}
	230
a7fa9851 MW	231	/* Restart the clock */
	232	data = i2c_smbus_read_byte_data(client, RX8581_REG_CTRL);
	233	if (data < 0) {
	234	dev_err(&client->dev, "Unable to read control register\n");
	235	return -EIO;
	236	}
	237
2884fce1 RM	238	err = i2c_smbus_write_byte_data(client, RX8581_REG_CTRL,
2884fce1 RM	239	(data & ~(RX8581_CTRL_STOP)));
a7fa9851 MW	240	if (err != 0) {
	241	dev_err(&client->dev, "Unable to write control register\n");
	242	return -EIO;
	243	}
	244
	245	return 0;
	246	}
	247
	248	static int rx8581_rtc_read_time(struct device dev, struct rtc_time tm)
	249	{
	250	return rx8581_get_datetime(to_i2c_client(dev), tm);
	251	}
	252
	253	static int rx8581_rtc_set_time(struct device dev, struct rtc_time tm)
	254	{
	255	return rx8581_set_datetime(to_i2c_client(dev), tm);
	256	}
	257
	258	static const struct rtc_class_ops rx8581_rtc_ops = {
	259	.read_time = rx8581_rtc_read_time,
	260	.set_time = rx8581_rtc_set_time,
	261	};
	262
5a167f45 GKH	263	static int rx8581_probe(struct i2c_client *client,
5a167f45 GKH	264	const struct i2c_device_id *id)
a7fa9851	265	{
d643a49a	266	struct rx8581 *rx8581;
a7fa9851 MW	267
	268	dev_dbg(&client->dev, "%s\n", __func__);
	269
d643a49a AW	270	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)
	271	&& !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
	272	return -EIO;
a7fa9851	273
d643a49a AW	274	rx8581 = devm_kzalloc(&client->dev, sizeof(struct rx8581), GFP_KERNEL);
	275	if (!rx8581)
	276	return -ENOMEM;
a7fa9851	277
d643a49a AW	278	i2c_set_clientdata(client, rx8581);
d643a49a AW	279	rx8581->client = client;
a7fa9851	280
d643a49a AW	281	if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
	282	rx8581->read_block_data = i2c_smbus_read_i2c_block_data;
	283	rx8581->write_block_data = i2c_smbus_write_i2c_block_data;
	284	} else {
	285	rx8581->read_block_data = rx8581_read_block_data;
	286	rx8581->write_block_data = rx8581_write_block_data;
	287	}
a7fa9851	288
d643a49a AW	289	rx8581->rtc = devm_rtc_device_register(&client->dev,
	290	rx8581_driver.driver.name, &rx8581_rtc_ops, THIS_MODULE);
	291
	292	if (IS_ERR(rx8581->rtc)) {
	293	dev_err(&client->dev,
	294	"unable to register the class device\n");
	295	return PTR_ERR(rx8581->rtc);
	296	}
a7fa9851 MW	297
	298	return 0;
	299	}
	300
a7fa9851 MW	301	static const struct i2c_device_id rx8581_id[] = {
	302	{ "rx8581", 0 },
	303	{ }
	304	};
	305	MODULE_DEVICE_TABLE(i2c, rx8581_id);
	306
ffbecfbd JMC	307	static const struct of_device_id rx8581_of_match[] = {
	308	{ .compatible = "epson,rx8581" },
	309	{ }
	310	};
	311	MODULE_DEVICE_TABLE(of, rx8581_of_match);
	312
a7fa9851 MW	313	static struct i2c_driver rx8581_driver = {
	314	.driver = {
	315	.name = "rtc-rx8581",
ffbecfbd	316	.of_match_table = of_match_ptr(rx8581_of_match),
a7fa9851 MW	317	},
a7fa9851 MW	318	.probe = rx8581_probe,
a7fa9851 MW	319	.id_table = rx8581_id,
	320	};
	321
0abc9201	322	module_i2c_driver(rx8581_driver);
a7fa9851	323
9756c4da	324	MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>");
a7fa9851 MW	325	MODULE_DESCRIPTION("Epson RX-8581 RTC driver");
a7fa9851 MW	326	MODULE_LICENSE("GPL");