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

/*
 * An I2C driver for the Philips PCF8563 RTC
 * Copyright 2005-06 Tower Technologies
 *
 * Author: Alessandro Zummo <[email protected]>
 * 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>

#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 */
};

/*
 * 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[13] = { PCF8563_REG_ST1 };

	struct i2c_msg msgs[] = {
		{/* setup read ptr */
			.addr = client->addr,
			.len = 1,
			.buf = buf
		},
		{/* read status + date */
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = 13,
			.buf = buf
		},
	};

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

	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 i, 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;

	/* write register's data */
	for (i = 0; i < 7; i++) {
		unsigned char data[2] = { PCF8563_REG_SC + i,
						buf[PCF8563_REG_SC + 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;
}

#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;

	int err = 0;

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

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

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

	if (IS_ERR(pcf8563->rtc)) {
		err = PTR_ERR(pcf8563->rtc);
		goto exit_kfree;
	}

	return 0;

exit_kfree:
	kfree(pcf8563);

	return err;
}

static int pcf8563_remove(struct i2c_client *client)
{
	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);

	if (pcf8563->rtc)
		rtc_device_unregister(pcf8563->rtc);

	kfree(pcf8563);

	return 0;
}

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[] __devinitconst = {
	{ .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,
	.remove		= pcf8563_remove,
	.id_table	= pcf8563_id,
};

module_i2c_driver(pcf8563_driver);

MODULE_AUTHOR("Alessandro Zummo <[email protected]>");
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 <[email protected]>
	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>
b5a82d62	23
e5fc9cc0	24	#define DRV_VERSION "0.4.3"
b5a82d62 AZ	25
	26	#define PCF8563_REG_ST1 0x00 /* status */
	27	#define PCF8563_REG_ST2 0x01
	28
	29	#define PCF8563_REG_SC 0x02 /* datetime */
	30	#define PCF8563_REG_MN 0x03
	31	#define PCF8563_REG_HR 0x04
	32	#define PCF8563_REG_DM 0x05
	33	#define PCF8563_REG_DW 0x06
	34	#define PCF8563_REG_MO 0x07
	35	#define PCF8563_REG_YR 0x08
	36
	37	#define PCF8563_REG_AMN 0x09 /* alarm */
	38	#define PCF8563_REG_AHR 0x0A
	39	#define PCF8563_REG_ADM 0x0B
	40	#define PCF8563_REG_ADW 0x0C
	41
	42	#define PCF8563_REG_CLKO 0x0D /* clock out */
	43	#define PCF8563_REG_TMRC 0x0E /* timer control */
	44	#define PCF8563_REG_TMR 0x0F /* timer */
	45
	46	#define PCF8563_SC_LV 0x80 /* low voltage */
	47	#define PCF8563_MO_C 0x80 /* century */
	48
e5fc9cc0 AZ	49	static struct i2c_driver pcf8563_driver;
e5fc9cc0 AZ	50
cbb94502	51	struct pcf8563 {
e5fc9cc0	52	struct rtc_device *rtc;
cbb94502 AN	53	/*
	54	* The meaning of MO_C bit varies by the chip type.
	55	* From PCF8563 datasheet: this bit is toggled when the years
	56	* register overflows from 99 to 00
	57	* 0 indicates the century is 20xx
	58	* 1 indicates the century is 19xx
	59	* From RTC8564 datasheet: this bit indicates change of
	60	* century. When the year digit data overflows from 99 to 00,
	61	* this bit is set. By presetting it to 0 while still in the
	62	* 20th century, it will be set in year 2000, ...
	63	* There seems no reliable way to know how the system use this
	64	* bit. So let's do it heuristically, assuming we are live in
	65	* 1970...2069.
	66	*/
	67	int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
0f20b767	68	int voltage_low; /* incicates if a low_voltage was detected */
cbb94502 AN	69	};
cbb94502 AN	70
b5a82d62 AZ	71	/*
	72	* In the routines that deal directly with the pcf8563 hardware, we use
	73	* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
	74	*/
	75	static int pcf8563_get_datetime(struct i2c_client client, struct rtc_time tm)
	76	{
e5fc9cc0	77	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
b5a82d62 AZ	78	unsigned char buf[13] = { PCF8563_REG_ST1 };
	79
	80	struct i2c_msg msgs[] = {
755e4a4b S	81	{/* setup read ptr */
	82	.addr = client->addr,
	83	.len = 1,
	84	.buf = buf
	85	},
	86	{/* read status + date */
	87	.addr = client->addr,
	88	.flags = I2C_M_RD,
	89	.len = 13,
	90	.buf = buf
	91	},
b5a82d62 AZ	92	};
	93
	94	/* read registers */
	95	if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
2a4e2b87	96	dev_err(&client->dev, "%s: read error\n", __func__);
b5a82d62 AZ	97	return -EIO;
	98	}
	99
0f20b767 AS	100	if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
0f20b767 AS	101	pcf8563->voltage_low = 1;
b5a82d62 AZ	102	dev_info(&client->dev,
b5a82d62 AZ	103	"low voltage detected, date/time is not reliable.\n");
0f20b767	104	}
b5a82d62 AZ	105
	106	dev_dbg(&client->dev,
	107	"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
	108	"mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
2a4e2b87	109	__func__,
b5a82d62 AZ	110	buf[0], buf[1], buf[2], buf[3],
	111	buf[4], buf[5], buf[6], buf[7],
	112	buf[8]);
	113
	114
fe20ba70 AB	115	tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
	116	tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
	117	tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
	118	tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
b5a82d62	119	tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
fe20ba70 AB	120	tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
fe20ba70 AB	121	tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
cbb94502 AN	122	if (tm->tm_year < 70)
	123	tm->tm_year += 100; /* assume we are in 1970...2069 */
	124	/* detect the polarity heuristically. see note above. */
	125	pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
	126	(tm->tm_year >= 100) : (tm->tm_year < 100);
b5a82d62 AZ	127
	128	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
	129	"mday=%d, mon=%d, year=%d, wday=%d\n",
2a4e2b87	130	__func__,
b5a82d62 AZ	131	tm->tm_sec, tm->tm_min, tm->tm_hour,
	132	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
	133
	134	/* the clock can give out invalid datetime, but we cannot return
	135	* -EINVAL otherwise hwclock will refuse to set the time on bootup.
	136	*/
	137	if (rtc_valid_tm(tm) < 0)
	138	dev_err(&client->dev, "retrieved date/time is not valid.\n");
	139
	140	return 0;
	141	}
	142
	143	static int pcf8563_set_datetime(struct i2c_client client, struct rtc_time tm)
	144	{
e5fc9cc0	145	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
b5a82d62 AZ	146	int i, err;
	147	unsigned char buf[9];
	148
	149	dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
	150	"mday=%d, mon=%d, year=%d, wday=%d\n",
2a4e2b87	151	__func__,
b5a82d62 AZ	152	tm->tm_sec, tm->tm_min, tm->tm_hour,
	153	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
	154
	155	/* hours, minutes and seconds */
fe20ba70 AB	156	buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
	157	buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
	158	buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
b5a82d62	159
fe20ba70	160	buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
b5a82d62 AZ	161
b5a82d62 AZ	162	/* month, 1 - 12 */
fe20ba70	163	buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
b5a82d62 AZ	164
b5a82d62 AZ	165	/* year and century */
fe20ba70	166	buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
cbb94502	167	if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
b5a82d62 AZ	168	buf[PCF8563_REG_MO] \|= PCF8563_MO_C;
	169
	170	buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
	171
	172	/* write register's data */
	173	for (i = 0; i < 7; i++) {
	174	unsigned char data[2] = { PCF8563_REG_SC + i,
	175	buf[PCF8563_REG_SC + i] };
	176
	177	err = i2c_master_send(client, data, sizeof(data));
	178	if (err != sizeof(data)) {
	179	dev_err(&client->dev,
	180	"%s: err=%d addr=%02x, data=%02x\n",
2a4e2b87	181	__func__, err, data[0], data[1]);
b5a82d62 AZ	182	return -EIO;
	183	}
	184	};
	185
	186	return 0;
	187	}
	188
0f20b767 AS	189	#ifdef CONFIG_RTC_INTF_DEV
	190	static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	191	{
	192	struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
	193	struct rtc_time tm;
	194
	195	switch (cmd) {
	196	case RTC_VL_READ:
	197	if (pcf8563->voltage_low)
	198	dev_info(dev, "low voltage detected, date/time is not reliable.\n");
	199
	200	if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
	201	sizeof(int)))
	202	return -EFAULT;
	203	return 0;
	204	case RTC_VL_CLR:
	205	/*
	206	* Clear the VL bit in the seconds register in case
	207	* the time has not been set already (which would
	208	* have cleared it). This does not really matter
	209	* because of the cached voltage_low value but do it
	210	* anyway for consistency.
	211	*/
	212	if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
	213	pcf8563_set_datetime(to_i2c_client(dev), &tm);
	214
	215	/* Clear the cached value. */
	216	pcf8563->voltage_low = 0;
	217
	218	return 0;
	219	default:
	220	return -ENOIOCTLCMD;
	221	}
	222	}
	223	#else
	224	#define pcf8563_rtc_ioctl NULL
	225	#endif
	226
b5a82d62 AZ	227	static int pcf8563_rtc_read_time(struct device dev, struct rtc_time tm)
	228	{
	229	return pcf8563_get_datetime(to_i2c_client(dev), tm);
	230	}
	231
	232	static int pcf8563_rtc_set_time(struct device dev, struct rtc_time tm)
	233	{
	234	return pcf8563_set_datetime(to_i2c_client(dev), tm);
	235	}
	236
ff8371ac	237	static const struct rtc_class_ops pcf8563_rtc_ops = {
0f20b767	238	.ioctl = pcf8563_rtc_ioctl,
b5a82d62 AZ	239	.read_time = pcf8563_rtc_read_time,
	240	.set_time = pcf8563_rtc_set_time,
	241	};
	242
d2653e92 JD	243	static int pcf8563_probe(struct i2c_client *client,
d2653e92 JD	244	const struct i2c_device_id *id)
b5a82d62	245	{
cbb94502	246	struct pcf8563 *pcf8563;
b5a82d62 AZ	247
	248	int err = 0;
	249
e5fc9cc0	250	dev_dbg(&client->dev, "%s\n", __func__);
b5a82d62	251
e5fc9cc0 AZ	252	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
e5fc9cc0 AZ	253	return -ENODEV;
b5a82d62	254
e5fc9cc0 AZ	255	pcf8563 = kzalloc(sizeof(struct pcf8563), GFP_KERNEL);
	256	if (!pcf8563)
	257	return -ENOMEM;
b5a82d62	258
b5a82d62 AZ	259	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
b5a82d62 AZ	260
b74d2caa AZ	261	i2c_set_clientdata(client, pcf8563);
b74d2caa AZ	262
e5fc9cc0 AZ	263	pcf8563->rtc = rtc_device_register(pcf8563_driver.driver.name,
e5fc9cc0 AZ	264	&client->dev, &pcf8563_rtc_ops, THIS_MODULE);
b5a82d62	265
e5fc9cc0 AZ	266	if (IS_ERR(pcf8563->rtc)) {
	267	err = PTR_ERR(pcf8563->rtc);
	268	goto exit_kfree;
b5a82d62 AZ	269	}
b5a82d62 AZ	270
b5a82d62 AZ	271	return 0;
b5a82d62 AZ	272
b5a82d62	273	exit_kfree:
cbb94502	274	kfree(pcf8563);
b5a82d62	275
b5a82d62 AZ	276	return err;
	277	}
	278
e5fc9cc0	279	static int pcf8563_remove(struct i2c_client *client)
b5a82d62	280	{
e5fc9cc0	281	struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
b5a82d62	282
e5fc9cc0 AZ	283	if (pcf8563->rtc)
e5fc9cc0 AZ	284	rtc_device_unregister(pcf8563->rtc);
b5a82d62	285
cbb94502	286	kfree(pcf8563);
b5a82d62 AZ	287
	288	return 0;
	289	}
	290
3760f736 JD	291	static const struct i2c_device_id pcf8563_id[] = {
3760f736 JD	292	{ "pcf8563", 0 },
8ea9212c	293	{ "rtc8564", 0 },
3760f736 JD	294	{ }
	295	};
	296	MODULE_DEVICE_TABLE(i2c, pcf8563_id);
	297
8dccaf06 NB	298	#ifdef CONFIG_OF
	299	static const struct of_device_id pcf8563_of_match[] __devinitconst = {
	300	{ .compatible = "nxp,pcf8563" },
	301	{}
	302	};
	303	MODULE_DEVICE_TABLE(of, pcf8563_of_match);
	304	#endif
	305
e5fc9cc0 AZ	306	static struct i2c_driver pcf8563_driver = {
	307	.driver = {
	308	.name = "rtc-pcf8563",
0a25bf40	309	.owner = THIS_MODULE,
8dccaf06	310	.of_match_table = of_match_ptr(pcf8563_of_match),
e5fc9cc0 AZ	311	},
	312	.probe = pcf8563_probe,
	313	.remove = pcf8563_remove,
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 <[email protected]>");
	320	MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
	321	MODULE_LICENSE("GPL");
	322	MODULE_VERSION(DRV_VERSION);