[deliverable/linux.git] / drivers / rtc / rtc-pcf8563.c

/*
 * An I2C driver for the Philips PCF8563 RTC
 * Copyright 2005-06 Tower Technologies
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 * Maintainers: http://www.nslu2-linux.org/
 *
 * based on the other drivers in this same directory.
 *
 * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
 *
 * 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/i2c.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/err.h>

#define DRV_VERSION "0.4.3"

#define PCF8563_REG_ST1		0x00 /* status */
#define PCF8563_REG_ST2		0x01

#define PCF8563_REG_SC		0x02 /* datetime */
#define PCF8563_REG_MN		0x03
#define PCF8563_REG_HR		0x04
#define PCF8563_REG_DM		0x05
#define PCF8563_REG_DW		0x06
#define PCF8563_REG_MO		0x07
#define PCF8563_REG_YR		0x08

#define PCF8563_REG_AMN		0x09 /* alarm */
#define PCF8563_REG_AHR		0x0A
#define PCF8563_REG_ADM		0x0B
#define PCF8563_REG_ADW		0x0C

#define PCF8563_REG_CLKO	0x0D /* clock out */
#define PCF8563_REG_TMRC	0x0E /* timer control */
#define PCF8563_REG_TMR		0x0F /* timer */

#define PCF8563_SC_LV		0x80 /* low voltage */
#define PCF8563_MO_C		0x80 /* century */

static struct i2c_driver pcf8563_driver;

struct pcf8563 {
	struct rtc_device *rtc;
	/*
	 * The meaning of MO_C bit varies by the chip type.
	 * From PCF8563 datasheet: this bit is toggled when the years
	 * register overflows from 99 to 00
	 *   0 indicates the century is 20xx
	 *   1 indicates the century is 19xx
	 * From RTC8564 datasheet: this bit indicates change of
	 * century. When the year digit data overflows from 99 to 00,
	 * this bit is set. By presetting it to 0 while still in the
	 * 20th century, it will be set in year 2000, ...
	 * There seems no reliable way to know how the system use this
	 * bit.  So let's do it heuristically, assuming we are live in
	 * 1970...2069.
	 */
	int c_polarity;	/* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
	int voltage_low; /* incicates if a low_voltage was detected */
};

static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
				   unsigned char length, unsigned char *buf)
{
	struct i2c_msg msgs[] = {
		{/* setup read ptr */
			.addr = client->addr,
			.len = 1,
			.buf = &reg,
		},
		{
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = length,
			.buf = buf
		},
	};

	if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
		dev_err(&client->dev, "%s: read error\n", __func__);
		return -EIO;
	}

	return 0;
}

static int pcf8563_write_block_data(struct i2c_client *client,
				   unsigned char reg, unsigned char length,
				   unsigned char *buf)
{
	int i, err;

	for (i = 0; i < length; i++) {
		unsigned char data[2] = { reg + i, buf[i] };

		err = i2c_master_send(client, data, sizeof(data));
		if (err != sizeof(data)) {
			dev_err(&client->dev,
				"%s: err=%d addr=%02x, data=%02x\n",
				__func__, err, data[0], data[1]);
			return -EIO;
		}
	}

	return 0;
}

/*
 * In the routines that deal directly with the pcf8563 hardware, we use
 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
 */
static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
{
	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
	unsigned char buf[9];
	int err;

	err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
	if (err)
		return err;

	if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
		pcf8563->voltage_low = 1;
		dev_info(&client->dev,
			"low voltage detected, date/time is not reliable.\n");
	}

	dev_dbg(&client->dev,
		"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
		"mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
		__func__,
		buf[0], buf[1], buf[2], buf[3],
		buf[4], buf[5], buf[6], buf[7],
		buf[8]);


	tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
	tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
	tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
	tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
	tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
	tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
	tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
	if (tm->tm_year < 70)
		tm->tm_year += 100;	/* assume we are in 1970...2069 */
	/* detect the polarity heuristically. see note above. */
	pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
		(tm->tm_year >= 100) : (tm->tm_year < 100);

	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);

	/* the clock can give out invalid datetime, but we cannot return
	 * -EINVAL otherwise hwclock will refuse to set the time on bootup.
	 */
	if (rtc_valid_tm(tm) < 0)
		dev_err(&client->dev, "retrieved date/time is not valid.\n");

	return 0;
}

static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
{
	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
	int err;
	unsigned char buf[9];

	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[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
	buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
	buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);

	buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);

	/* month, 1 - 12 */
	buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);

	/* year and century */
	buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
	if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
		buf[PCF8563_REG_MO] |= PCF8563_MO_C;

	buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;

	err = pcf8563_write_block_data(client, PCF8563_REG_SC,
				9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
	if (err)
		return err;

	return 0;
}

#ifdef CONFIG_RTC_INTF_DEV
static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
	struct rtc_time tm;

	switch (cmd) {
	case RTC_VL_READ:
		if (pcf8563->voltage_low)
			dev_info(dev, "low voltage detected, date/time is not reliable.\n");

		if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
					sizeof(int)))
			return -EFAULT;
		return 0;
	case RTC_VL_CLR:
		/*
		 * Clear the VL bit in the seconds register in case
		 * the time has not been set already (which would
		 * have cleared it). This does not really matter
		 * because of the cached voltage_low value but do it
		 * anyway for consistency.
		 */
		if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
			pcf8563_set_datetime(to_i2c_client(dev), &tm);

		/* Clear the cached value. */
		pcf8563->voltage_low = 0;

		return 0;
	default:
		return -ENOIOCTLCMD;
	}
}
#else
#define pcf8563_rtc_ioctl NULL
#endif

static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	return pcf8563_get_datetime(to_i2c_client(dev), tm);
}

static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	return pcf8563_set_datetime(to_i2c_client(dev), tm);
}

static const struct rtc_class_ops pcf8563_rtc_ops = {
	.ioctl		= pcf8563_rtc_ioctl,
	.read_time	= pcf8563_rtc_read_time,
	.set_time	= pcf8563_rtc_set_time,
};

static int pcf8563_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct pcf8563 *pcf8563;

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

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
		return -ENODEV;

	pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
				GFP_KERNEL);
	if (!pcf8563)
		return -ENOMEM;

	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");

	i2c_set_clientdata(client, pcf8563);

	pcf8563->rtc = devm_rtc_device_register(&client->dev,
				pcf8563_driver.driver.name,
				&pcf8563_rtc_ops, THIS_MODULE);

	return PTR_ERR_OR_ZERO(pcf8563->rtc);
}

static const struct i2c_device_id pcf8563_id[] = {
	{ "pcf8563", 0 },
	{ "rtc8564", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pcf8563_id);

#ifdef CONFIG_OF
static const struct of_device_id pcf8563_of_match[] = {
	{ .compatible = "nxp,pcf8563" },
	{}
};
MODULE_DEVICE_TABLE(of, pcf8563_of_match);
#endif

static struct i2c_driver pcf8563_driver = {
	.driver		= {
		.name	= "rtc-pcf8563",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(pcf8563_of_match),
	},
	.probe		= pcf8563_probe,
	.id_table	= pcf8563_id,
};

module_i2c_driver(pcf8563_driver);

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
Commit	Line	Data
b5a82d62 AZ	1	/*
	2	* An I2C driver for the Philips PCF8563 RTC
	3	* Copyright 2005-06 Tower Technologies
	4	*
	5	* Author: Alessandro Zummo <a.zummo@towertech.it>
	6	* Maintainers: http://www.nslu2-linux.org/
	7	*
	8	* based on the other drivers in this same directory.
	9	*
	10	* http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*/
	16
	17	#include <linux/i2c.h>
	18	#include <linux/bcd.h>
	19	#include <linux/rtc.h>
5a0e3ad6	20	#include <linux/slab.h>
2113852b	21	#include <linux/module.h>
8dccaf06	22	#include <linux/of.h>
23f809ee	23	#include <linux/err.h>
b5a82d62	24
e5fc9cc0	25	#define DRV_VERSION "0.4.3"
b5a82d62 AZ	26
	27	#define PCF8563_REG_ST1 0x00 /* status */
	28	#define PCF8563_REG_ST2 0x01
	29
	30	#define PCF8563_REG_SC 0x02 /* datetime */
	31	#define PCF8563_REG_MN 0x03
	32	#define PCF8563_REG_HR 0x04
	33	#define PCF8563_REG_DM 0x05
	34	#define PCF8563_REG_DW 0x06
	35	#define PCF8563_REG_MO 0x07
	36	#define PCF8563_REG_YR 0x08
	37
	38	#define PCF8563_REG_AMN 0x09 /* alarm */
	39	#define PCF8563_REG_AHR 0x0A
	40	#define PCF8563_REG_ADM 0x0B
	41	#define PCF8563_REG_ADW 0x0C
	42
	43	#define PCF8563_REG_CLKO 0x0D /* clock out */
	44	#define PCF8563_REG_TMRC 0x0E /* timer control */
	45	#define PCF8563_REG_TMR 0x0F /* timer */
	46
	47	#define PCF8563_SC_LV 0x80 /* low voltage */
	48	#define PCF8563_MO_C 0x80 /* century */
	49
e5fc9cc0 AZ	50	static struct i2c_driver pcf8563_driver;
e5fc9cc0 AZ	51
cbb94502	52	struct pcf8563 {
e5fc9cc0	53	struct rtc_device *rtc;
cbb94502 AN	54	/*
	55	* The meaning of MO_C bit varies by the chip type.
	56	* From PCF8563 datasheet: this bit is toggled when the years
	57	* register overflows from 99 to 00
	58	* 0 indicates the century is 20xx
	59	* 1 indicates the century is 19xx
	60	* From RTC8564 datasheet: this bit indicates change of
	61	* century. When the year digit data overflows from 99 to 00,
	62	* this bit is set. By presetting it to 0 while still in the
	63	* 20th century, it will be set in year 2000, ...
	64	* There seems no reliable way to know how the system use this
	65	* bit. So let's do it heuristically, assuming we are live in
	66	* 1970...2069.
	67	*/
	68	int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
0f20b767	69	int voltage_low; /* incicates if a low_voltage was detected */
cbb94502 AN	70	};
cbb94502 AN	71
2784366c VD	72	static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
2784366c VD	73	unsigned char length, unsigned char *buf)
b5a82d62	74	{
b5a82d62	75	struct i2c_msg msgs[] = {
755e4a4b S	76	{/* setup read ptr */
	77	.addr = client->addr,
	78	.len = 1,
2784366c	79	.buf = &reg,
755e4a4b	80	},
2784366c	81	{
755e4a4b S	82	.addr = client->addr,
755e4a4b S	83	.flags = I2C_M_RD,
2784366c	84	.len = length,
755e4a4b S	85	.buf = buf
755e4a4b S	86	},
b5a82d62 AZ	87	};
b5a82d62 AZ	88
b5a82d62	89	if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
2a4e2b87	90	dev_err(&client->dev, "%s: read error\n", __func__);
b5a82d62 AZ	91	return -EIO;
	92	}
	93
2784366c VD	94	return 0;
	95	}
	96
	97	static int pcf8563_write_block_data(struct i2c_client *client,
	98	unsigned char reg, unsigned char length,
	99	unsigned char *buf)
	100	{
	101	int i, err;
	102
	103	for (i = 0; i < length; i++) {
	104	unsigned char data[2] = { reg + i, buf[i] };
	105
	106	err = i2c_master_send(client, data, sizeof(data));
	107	if (err != sizeof(data)) {
	108	dev_err(&client->dev,
	109	"%s: err=%d addr=%02x, data=%02x\n",
	110	__func__, err, data[0], data[1]);
	111	return -EIO;
	112	}
	113	}
	114
	115	return 0;
	116	}
	117
	118	/*
	119	* In the routines that deal directly with the pcf8563 hardware, we use
	120	* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
	121	*/
	122	static int pcf8563_get_datetime(struct i2c_client client, struct rtc_time tm)
	123	{
	124	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
	125	unsigned char buf[9];
	126	int err;
	127
	128	err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
	129	if (err)
	130	return err;
	131
0f20b767 AS	132	if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
0f20b767 AS	133	pcf8563->voltage_low = 1;
b5a82d62 AZ	134	dev_info(&client->dev,
b5a82d62 AZ	135	"low voltage detected, date/time is not reliable.\n");
0f20b767	136	}
b5a82d62 AZ	137
	138	dev_dbg(&client->dev,
	139	"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
	140	"mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
2a4e2b87	141	__func__,
b5a82d62 AZ	142	buf[0], buf[1], buf[2], buf[3],
	143	buf[4], buf[5], buf[6], buf[7],
	144	buf[8]);
	145
	146
fe20ba70 AB	147	tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
	148	tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
	149	tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
	150	tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
b5a82d62	151	tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
fe20ba70 AB	152	tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
fe20ba70 AB	153	tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
cbb94502 AN	154	if (tm->tm_year < 70)
	155	tm->tm_year += 100; /* assume we are in 1970...2069 */
	156	/* detect the polarity heuristically. see note above. */
	157	pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
	158	(tm->tm_year >= 100) : (tm->tm_year < 100);
b5a82d62 AZ	159
	160	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
	161	"mday=%d, mon=%d, year=%d, wday=%d\n",
2a4e2b87	162	__func__,
b5a82d62 AZ	163	tm->tm_sec, tm->tm_min, tm->tm_hour,
	164	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
	165
	166	/* the clock can give out invalid datetime, but we cannot return
	167	* -EINVAL otherwise hwclock will refuse to set the time on bootup.
	168	*/
	169	if (rtc_valid_tm(tm) < 0)
	170	dev_err(&client->dev, "retrieved date/time is not valid.\n");
	171
	172	return 0;
	173	}
	174
	175	static int pcf8563_set_datetime(struct i2c_client client, struct rtc_time tm)
	176	{
e5fc9cc0	177	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
2784366c	178	int err;
b5a82d62 AZ	179	unsigned char buf[9];
	180
	181	dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
	182	"mday=%d, mon=%d, year=%d, wday=%d\n",
2a4e2b87	183	__func__,
b5a82d62 AZ	184	tm->tm_sec, tm->tm_min, tm->tm_hour,
	185	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
	186
	187	/* hours, minutes and seconds */
fe20ba70 AB	188	buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
	189	buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
	190	buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
b5a82d62	191
fe20ba70	192	buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
b5a82d62 AZ	193
b5a82d62 AZ	194	/* month, 1 - 12 */
fe20ba70	195	buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
b5a82d62 AZ	196
b5a82d62 AZ	197	/* year and century */
fe20ba70	198	buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
cbb94502	199	if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
b5a82d62 AZ	200	buf[PCF8563_REG_MO] \|= PCF8563_MO_C;
	201
	202	buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
	203
2784366c VD	204	err = pcf8563_write_block_data(client, PCF8563_REG_SC,
	205	9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
	206	if (err)
	207	return err;
b5a82d62 AZ	208
	209	return 0;
	210	}
	211
0f20b767 AS	212	#ifdef CONFIG_RTC_INTF_DEV
	213	static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	214	{
	215	struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
	216	struct rtc_time tm;
	217
	218	switch (cmd) {
	219	case RTC_VL_READ:
	220	if (pcf8563->voltage_low)
	221	dev_info(dev, "low voltage detected, date/time is not reliable.\n");
	222
	223	if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
	224	sizeof(int)))
	225	return -EFAULT;
	226	return 0;
	227	case RTC_VL_CLR:
	228	/*
	229	* Clear the VL bit in the seconds register in case
	230	* the time has not been set already (which would
	231	* have cleared it). This does not really matter
	232	* because of the cached voltage_low value but do it
	233	* anyway for consistency.
	234	*/
	235	if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
	236	pcf8563_set_datetime(to_i2c_client(dev), &tm);
	237
	238	/* Clear the cached value. */
	239	pcf8563->voltage_low = 0;
	240
	241	return 0;
	242	default:
	243	return -ENOIOCTLCMD;
	244	}
	245	}
	246	#else
	247	#define pcf8563_rtc_ioctl NULL
	248	#endif
	249
b5a82d62 AZ	250	static int pcf8563_rtc_read_time(struct device dev, struct rtc_time tm)
	251	{
	252	return pcf8563_get_datetime(to_i2c_client(dev), tm);
	253	}
	254
	255	static int pcf8563_rtc_set_time(struct device dev, struct rtc_time tm)
	256	{
	257	return pcf8563_set_datetime(to_i2c_client(dev), tm);
	258	}
	259
ff8371ac	260	static const struct rtc_class_ops pcf8563_rtc_ops = {
0f20b767	261	.ioctl = pcf8563_rtc_ioctl,
b5a82d62 AZ	262	.read_time = pcf8563_rtc_read_time,
	263	.set_time = pcf8563_rtc_set_time,
	264	};
	265
d2653e92 JD	266	static int pcf8563_probe(struct i2c_client *client,
d2653e92 JD	267	const struct i2c_device_id *id)
b5a82d62	268	{
cbb94502	269	struct pcf8563 *pcf8563;
b5a82d62	270
e5fc9cc0	271	dev_dbg(&client->dev, "%s\n", __func__);
b5a82d62	272
e5fc9cc0 AZ	273	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
e5fc9cc0 AZ	274	return -ENODEV;
b5a82d62	275
d6fbdc34 JH	276	pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
d6fbdc34 JH	277	GFP_KERNEL);
e5fc9cc0 AZ	278	if (!pcf8563)
e5fc9cc0 AZ	279	return -ENOMEM;
b5a82d62	280
b5a82d62 AZ	281	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
b5a82d62 AZ	282
b74d2caa AZ	283	i2c_set_clientdata(client, pcf8563);
b74d2caa AZ	284
d6fbdc34 JH	285	pcf8563->rtc = devm_rtc_device_register(&client->dev,
	286	pcf8563_driver.driver.name,
	287	&pcf8563_rtc_ops, THIS_MODULE);
b5a82d62	288
dac30a98	289	return PTR_ERR_OR_ZERO(pcf8563->rtc);
b5a82d62 AZ	290	}
b5a82d62 AZ	291
3760f736 JD	292	static const struct i2c_device_id pcf8563_id[] = {
3760f736 JD	293	{ "pcf8563", 0 },
8ea9212c	294	{ "rtc8564", 0 },
3760f736 JD	295	{ }
	296	};
	297	MODULE_DEVICE_TABLE(i2c, pcf8563_id);
	298
8dccaf06	299	#ifdef CONFIG_OF
5a167f45	300	static const struct of_device_id pcf8563_of_match[] = {
8dccaf06 NB	301	{ .compatible = "nxp,pcf8563" },
	302	{}
	303	};
	304	MODULE_DEVICE_TABLE(of, pcf8563_of_match);
	305	#endif
	306
e5fc9cc0 AZ	307	static struct i2c_driver pcf8563_driver = {
	308	.driver = {
	309	.name = "rtc-pcf8563",
0a25bf40	310	.owner = THIS_MODULE,
8dccaf06	311	.of_match_table = of_match_ptr(pcf8563_of_match),
e5fc9cc0 AZ	312	},
e5fc9cc0 AZ	313	.probe = pcf8563_probe,
3760f736	314	.id_table = pcf8563_id,
e5fc9cc0 AZ	315	};
e5fc9cc0 AZ	316
0abc9201	317	module_i2c_driver(pcf8563_driver);
b5a82d62 AZ	318
	319	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	320	MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
	321	MODULE_LICENSE("GPL");
	322	MODULE_VERSION(DRV_VERSION);