[linux.git] / drivers / rtc / rtc-max8925.c

/*
 * RTC driver for Maxim MAX8925
 *
 * Copyright (C) 2009-2010 Marvell International Ltd.
 *	Haojian Zhuang <[email protected]>
 *
 * 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/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/mfd/max8925.h>

enum {
	RTC_SEC = 0,
	RTC_MIN,
	RTC_HOUR,
	RTC_WEEKDAY,
	RTC_DATE,
	RTC_MONTH,
	RTC_YEAR1,
	RTC_YEAR2,
};

#define MAX8925_RTC_SEC			0x00
#define MAX8925_RTC_MIN			0x01
#define MAX8925_RTC_HOUR		0x02
#define MAX8925_RTC_WEEKDAY		0x03
#define MAX8925_RTC_DATE		0x04
#define MAX8925_RTC_MONTH		0x05
#define MAX8925_RTC_YEAR1		0x06
#define MAX8925_RTC_YEAR2		0x07
#define MAX8925_ALARM0_SEC		0x08
#define MAX8925_ALARM0_MIN		0x09
#define MAX8925_ALARM0_HOUR		0x0a
#define MAX8925_ALARM0_WEEKDAY		0x0b
#define MAX8925_ALARM0_DATE		0x0c
#define MAX8925_ALARM0_MON		0x0d
#define MAX8925_ALARM0_YEAR1		0x0e
#define MAX8925_ALARM0_YEAR2		0x0f
#define MAX8925_ALARM1_SEC		0x10
#define MAX8925_ALARM1_MIN		0x11
#define MAX8925_ALARM1_HOUR		0x12
#define MAX8925_ALARM1_WEEKDAY		0x13
#define MAX8925_ALARM1_DATE		0x14
#define MAX8925_ALARM1_MON		0x15
#define MAX8925_ALARM1_YEAR1		0x16
#define MAX8925_ALARM1_YEAR2		0x17
#define MAX8925_RTC_CNTL		0x1b
#define MAX8925_RTC_STATUS		0x20

#define TIME_NUM			8
#define ALARM_1SEC			(1 << 7)
#define HOUR_12				(1 << 7)
#define HOUR_AM_PM			(1 << 5)
#define ALARM0_IRQ			(1 << 3)
#define ALARM1_IRQ			(1 << 2)
#define ALARM0_STATUS			(1 << 2)
#define ALARM1_STATUS			(1 << 1)


struct max8925_rtc_info {
	struct rtc_device	*rtc_dev;
	struct max8925_chip	*chip;
	struct i2c_client	*rtc;
	struct device		*dev;
	int			irq;
};

static irqreturn_t rtc_update_handler(int irq, void *data)
{
	struct max8925_rtc_info *info = (struct max8925_rtc_info *)data;

	/* disable ALARM0 except for 1SEC alarm */
	max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0);
	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
	return IRQ_HANDLED;
}

static int tm_calc(struct rtc_time *tm, unsigned char *buf, int len)
{
	if (len < TIME_NUM)
		return -EINVAL;
	tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000
			+ (buf[RTC_YEAR2] & 0xf) * 100
			+ (buf[RTC_YEAR1] >> 4) * 10
			+ (buf[RTC_YEAR1] & 0xf);
	tm->tm_year -= 1900;
	tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10
			+ (buf[RTC_MONTH] & 0x0f);
	tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10
			+ (buf[RTC_DATE] & 0x0f);
	tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;
	if (buf[RTC_HOUR] & HOUR_12) {
		tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10
				+ (buf[RTC_HOUR] & 0x0f);
		if (buf[RTC_HOUR] & HOUR_AM_PM)
			tm->tm_hour += 12;
	} else
		tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10
				+ (buf[RTC_HOUR] & 0x0f);
	tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10
			+ (buf[RTC_MIN] & 0x0f);
	tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10
			+ (buf[RTC_SEC] & 0x0f);
	return 0;
}

static int data_calc(unsigned char *buf, struct rtc_time *tm, int len)
{
	unsigned char high, low;

	if (len < TIME_NUM)
		return -EINVAL;

	high = (tm->tm_year + 1900) / 1000;
	low = (tm->tm_year + 1900) / 100;
	low = low - high * 10;
	buf[RTC_YEAR2] = (high << 4) + low;
	high = (tm->tm_year + 1900) / 10;
	low = tm->tm_year + 1900;
	low = low - high * 10;
	high = high - (high / 10) * 10;
	buf[RTC_YEAR1] = (high << 4) + low;
	high = tm->tm_mon / 10;
	low = tm->tm_mon;
	low = low - high * 10;
	buf[RTC_MONTH] = (high << 4) + low;
	high = tm->tm_mday / 10;
	low = tm->tm_mday;
	low = low - high * 10;
	buf[RTC_DATE] = (high << 4) + low;
	buf[RTC_WEEKDAY] = tm->tm_wday;
	high = tm->tm_hour / 10;
	low = tm->tm_hour;
	low = low - high * 10;
	buf[RTC_HOUR] = (high << 4) + low;
	high = tm->tm_min / 10;
	low = tm->tm_min;
	low = low - high * 10;
	buf[RTC_MIN] = (high << 4) + low;
	high = tm->tm_sec / 10;
	low = tm->tm_sec;
	low = low - high * 10;
	buf[RTC_SEC] = (high << 4) + low;
	return 0;
}

static int max8925_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[TIME_NUM];
	int ret;

	ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
	if (ret < 0)
		goto out;
	ret = tm_calc(tm, buf, TIME_NUM);
out:
	return ret;
}

static int max8925_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[TIME_NUM];
	int ret;

	ret = data_calc(buf, tm, TIME_NUM);
	if (ret < 0)
		goto out;
	ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
out:
	return ret;
}

static int max8925_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[TIME_NUM];
	int ret;

	ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
	if (ret < 0)
		goto out;
	ret = tm_calc(&alrm->time, buf, TIME_NUM);
	if (ret < 0)
		goto out;
	ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK);
	if (ret < 0)
		goto out;
	if (ret & ALARM0_IRQ) {
		alrm->enabled = 0;
	} else {
		ret = max8925_reg_read(info->rtc, MAX8925_ALARM0_CNTL);
		if (ret < 0)
			goto out;
		if (!ret)
			alrm->enabled = 0;
		else
			alrm->enabled = 1;
	}
	ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);
	if (ret < 0)
		goto out;
	if (ret & ALARM0_STATUS)
		alrm->pending = 1;
	else
		alrm->pending = 0;
	return 0;
out:
	return ret;
}

static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[TIME_NUM];
	int ret;

	ret = data_calc(buf, &alrm->time, TIME_NUM);
	if (ret < 0)
		goto out;
	ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
	if (ret < 0)
		goto out;
	if (alrm->enabled)
		/* only enable alarm on year/month/day/hour/min/sec */
		ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
	else
		ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x0);
out:
	return ret;
}

static const struct rtc_class_ops max8925_rtc_ops = {
	.read_time	= max8925_rtc_read_time,
	.set_time	= max8925_rtc_set_time,
	.read_alarm	= max8925_rtc_read_alarm,
	.set_alarm	= max8925_rtc_set_alarm,
};

static int max8925_rtc_probe(struct platform_device *pdev)
{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_rtc_info *info;
	int ret;

	info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_rtc_info),
			    GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	info->chip = chip;
	info->rtc = chip->rtc;
	info->dev = &pdev->dev;
	info->irq = platform_get_irq(pdev, 0);

	ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
					rtc_update_handler, IRQF_ONESHOT,
					"rtc-alarm0", info);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
			info->irq, ret);
		return ret;
	}

	dev_set_drvdata(&pdev->dev, info);
	/* XXX - isn't this redundant? */
	platform_set_drvdata(pdev, info);

	device_init_wakeup(&pdev->dev, 1);

	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8925-rtc",
					&max8925_rtc_ops, THIS_MODULE);
	ret = PTR_ERR(info->rtc_dev);
	if (IS_ERR(info->rtc_dev)) {
		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
		return ret;
	}

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int max8925_rtc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);

	if (device_may_wakeup(dev))
		chip->wakeup_flag |= 1 << MAX8925_IRQ_RTC_ALARM0;
	return 0;
}
static int max8925_rtc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);

	if (device_may_wakeup(dev))
		chip->wakeup_flag &= ~(1 << MAX8925_IRQ_RTC_ALARM0);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(max8925_rtc_pm_ops, max8925_rtc_suspend, max8925_rtc_resume);

static struct platform_driver max8925_rtc_driver = {
	.driver		= {
		.name	= "max8925-rtc",
		.pm     = &max8925_rtc_pm_ops,
	},
	.probe		= max8925_rtc_probe,
};

module_platform_driver(max8925_rtc_driver);

MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");
MODULE_AUTHOR("Haojian Zhuang <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
a39069f6 HZ	1	/*
	2	* RTC driver for Maxim MAX8925
	3	*
	4	* Copyright (C) 2009-2010 Marvell International Ltd.
	5	* Haojian Zhuang <[email protected]>
	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
	12	#include <linux/module.h>
	13	#include <linux/i2c.h>
5a0e3ad6	14	#include <linux/slab.h>
a39069f6 HZ	15	#include <linux/rtc.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/mfd/max8925.h>
	18
	19	enum {
	20	RTC_SEC = 0,
	21	RTC_MIN,
	22	RTC_HOUR,
	23	RTC_WEEKDAY,
	24	RTC_DATE,
	25	RTC_MONTH,
	26	RTC_YEAR1,
	27	RTC_YEAR2,
	28	};
	29
	30	#define MAX8925_RTC_SEC 0x00
	31	#define MAX8925_RTC_MIN 0x01
	32	#define MAX8925_RTC_HOUR 0x02
	33	#define MAX8925_RTC_WEEKDAY 0x03
	34	#define MAX8925_RTC_DATE 0x04
	35	#define MAX8925_RTC_MONTH 0x05
	36	#define MAX8925_RTC_YEAR1 0x06
	37	#define MAX8925_RTC_YEAR2 0x07
	38	#define MAX8925_ALARM0_SEC 0x08
	39	#define MAX8925_ALARM0_MIN 0x09
	40	#define MAX8925_ALARM0_HOUR 0x0a
	41	#define MAX8925_ALARM0_WEEKDAY 0x0b
	42	#define MAX8925_ALARM0_DATE 0x0c
	43	#define MAX8925_ALARM0_MON 0x0d
	44	#define MAX8925_ALARM0_YEAR1 0x0e
	45	#define MAX8925_ALARM0_YEAR2 0x0f
	46	#define MAX8925_ALARM1_SEC 0x10
	47	#define MAX8925_ALARM1_MIN 0x11
	48	#define MAX8925_ALARM1_HOUR 0x12
	49	#define MAX8925_ALARM1_WEEKDAY 0x13
	50	#define MAX8925_ALARM1_DATE 0x14
	51	#define MAX8925_ALARM1_MON 0x15
	52	#define MAX8925_ALARM1_YEAR1 0x16
	53	#define MAX8925_ALARM1_YEAR2 0x17
	54	#define MAX8925_RTC_CNTL 0x1b
	55	#define MAX8925_RTC_STATUS 0x20
	56
	57	#define TIME_NUM 8
	58	#define ALARM_1SEC (1 << 7)
	59	#define HOUR_12 (1 << 7)
	60	#define HOUR_AM_PM (1 << 5)
	61	#define ALARM0_IRQ (1 << 3)
	62	#define ALARM1_IRQ (1 << 2)
	63	#define ALARM0_STATUS (1 << 2)
	64	#define ALARM1_STATUS (1 << 1)
	65
	66
	67	struct max8925_rtc_info {
	68	struct rtc_device *rtc_dev;
	69	struct max8925_chip *chip;
	70	struct i2c_client *rtc;
	71	struct device *dev;
c1a2f31d	72	int irq;
a39069f6 HZ	73	};
	74
	75	static irqreturn_t rtc_update_handler(int irq, void *data)
	76	{
	77	struct max8925_rtc_info info = (struct max8925_rtc_info )data;
	78
	79	/* disable ALARM0 except for 1SEC alarm */
	80	max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0);
	81	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF \| RTC_AF);
	82	return IRQ_HANDLED;
	83	}
	84
	85	static int tm_calc(struct rtc_time tm, unsigned char buf, int len)
	86	{
	87	if (len < TIME_NUM)
	88	return -EINVAL;
	89	tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000
	90	+ (buf[RTC_YEAR2] & 0xf) * 100
	91	+ (buf[RTC_YEAR1] >> 4) * 10
	92	+ (buf[RTC_YEAR1] & 0xf);
	93	tm->tm_year -= 1900;
	94	tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10
	95	+ (buf[RTC_MONTH] & 0x0f);
	96	tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10
	97	+ (buf[RTC_DATE] & 0x0f);
	98	tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;
	99	if (buf[RTC_HOUR] & HOUR_12) {
	100	tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10
	101	+ (buf[RTC_HOUR] & 0x0f);
	102	if (buf[RTC_HOUR] & HOUR_AM_PM)
	103	tm->tm_hour += 12;
	104	} else
	105	tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10
	106	+ (buf[RTC_HOUR] & 0x0f);
	107	tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10
	108	+ (buf[RTC_MIN] & 0x0f);
	109	tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10
	110	+ (buf[RTC_SEC] & 0x0f);
	111	return 0;
	112	}
	113
	114	static int data_calc(unsigned char buf, struct rtc_time tm, int len)
	115	{
	116	unsigned char high, low;
	117
	118	if (len < TIME_NUM)
	119	return -EINVAL;
	120
	121	high = (tm->tm_year + 1900) / 1000;
	122	low = (tm->tm_year + 1900) / 100;
	123	low = low - high * 10;
	124	buf[RTC_YEAR2] = (high << 4) + low;
	125	high = (tm->tm_year + 1900) / 10;
	126	low = tm->tm_year + 1900;
	127	low = low - high * 10;
	128	high = high - (high / 10) * 10;
	129	buf[RTC_YEAR1] = (high << 4) + low;
	130	high = tm->tm_mon / 10;
	131	low = tm->tm_mon;
	132	low = low - high * 10;
	133	buf[RTC_MONTH] = (high << 4) + low;
	134	high = tm->tm_mday / 10;
	135	low = tm->tm_mday;
	136	low = low - high * 10;
137	buf[RTC_DATE] = (high << 4) + low;
138	buf[RTC_WEEKDAY] = tm->tm_wday;
139	high = tm->tm_hour / 10;
140	low = tm->tm_hour;
141	low = low - high * 10;
142	buf[RTC_HOUR] = (high << 4) + low;
143	high = tm->tm_min / 10;
144	low = tm->tm_min;
145	low = low - high * 10;
146	buf[RTC_MIN] = (high << 4) + low;
147	high = tm->tm_sec / 10;
148	low = tm->tm_sec;
149	low = low - high * 10;
150	buf[RTC_SEC] = (high << 4) + low;
151	return 0;
152	}
153
154	static int max8925_rtc_read_time(struct device dev, struct rtc_time tm)
155	{
156	struct max8925_rtc_info *info = dev_get_drvdata(dev);
157	unsigned char buf[TIME_NUM];
158	int ret;
159
160	ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
161	if (ret < 0)
162	goto out;
163	ret = tm_calc(tm, buf, TIME_NUM);
164	out:
165	return ret;
166	}
167
168	static int max8925_rtc_set_time(struct device dev, struct rtc_time tm)
169	{
170	struct max8925_rtc_info *info = dev_get_drvdata(dev);
171	unsigned char buf[TIME_NUM];
172	int ret;
173
174	ret = data_calc(buf, tm, TIME_NUM);
175	if (ret < 0)
176	goto out;
177	ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
178	out:
179	return ret;
180	}
181
182	static int max8925_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
183	{
184	struct max8925_rtc_info *info = dev_get_drvdata(dev);
185	unsigned char buf[TIME_NUM];
186	int ret;
187
188	ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
189	if (ret < 0)
190	goto out;
191	ret = tm_calc(&alrm->time, buf, TIME_NUM);
192	if (ret < 0)
193	goto out;
194	ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK);
195	if (ret < 0)
196	goto out;
fad0738d	197	if (ret & ALARM0_IRQ) {
a39069f6	198	alrm->enabled = 0;
fad0738d KL	199	} else {
	200	ret = max8925_reg_read(info->rtc, MAX8925_ALARM0_CNTL);
	201	if (ret < 0)
	202	goto out;
	203	if (!ret)
	204	alrm->enabled = 0;
	205	else
	206	alrm->enabled = 1;
	207	}
a39069f6 HZ	208	ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);
	209	if (ret < 0)
	210	goto out;
	211	if (ret & ALARM0_STATUS)
	212	alrm->pending = 1;
	213	else
	214	alrm->pending = 0;
0cf30bdd	215	return 0;
a39069f6 HZ	216	out:
	217	return ret;
	218	}
	219
	220	static int max8925_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	221	{
	222	struct max8925_rtc_info *info = dev_get_drvdata(dev);
	223	unsigned char buf[TIME_NUM];
	224	int ret;
	225
	226	ret = data_calc(buf, &alrm->time, TIME_NUM);
	227	if (ret < 0)
	228	goto out;
	229	ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
	230	if (ret < 0)
	231	goto out;
fad0738d KL	232	if (alrm->enabled)
	233	/* only enable alarm on year/month/day/hour/min/sec */
	234	ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
	235	else
	236	ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x0);
a39069f6 HZ	237	out:
	238	return ret;
	239	}
	240
	241	static const struct rtc_class_ops max8925_rtc_ops = {
	242	.read_time = max8925_rtc_read_time,
	243	.set_time = max8925_rtc_set_time,
	244	.read_alarm = max8925_rtc_read_alarm,
	245	.set_alarm = max8925_rtc_set_alarm,
	246	};
	247
5a167f45	248	static int max8925_rtc_probe(struct platform_device *pdev)
a39069f6 HZ	249	{
	250	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	251	struct max8925_rtc_info *info;
c1a2f31d	252	int ret;
a39069f6	253
e035be6a SK	254	info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_rtc_info),
e035be6a SK	255	GFP_KERNEL);
a39069f6 HZ	256	if (!info)
	257	return -ENOMEM;
	258	info->chip = chip;
	259	info->rtc = chip->rtc;
	260	info->dev = &pdev->dev;
c1a2f31d	261	info->irq = platform_get_irq(pdev, 0);
a39069f6	262
e035be6a SK	263	ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
	264	rtc_update_handler, IRQF_ONESHOT,
	265	"rtc-alarm0", info);
a39069f6 HZ	266	if (ret < 0) {
a39069f6 HZ	267	dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
c1a2f31d	268	info->irq, ret);
28e1de09	269	return ret;
a39069f6 HZ	270	}
a39069f6 HZ	271
f945a3d9	272	dev_set_drvdata(&pdev->dev, info);
2f5c4fe8 JS	273	/* XXX - isn't this redundant? */
2f5c4fe8 JS	274	platform_set_drvdata(pdev, info);
f945a3d9	275
74d836c4 KL	276	device_init_wakeup(&pdev->dev, 1);
74d836c4 KL	277
e035be6a	278	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8925-rtc",
a39069f6 HZ	279	&max8925_rtc_ops, THIS_MODULE);
	280	ret = PTR_ERR(info->rtc_dev);
	281	if (IS_ERR(info->rtc_dev)) {
	282	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
28e1de09	283	return ret;
a39069f6 HZ	284	}
a39069f6 HZ	285
a39069f6	286	return 0;
a39069f6 HZ	287	}
a39069f6 HZ	288
74d836c4 KL	289	#ifdef CONFIG_PM_SLEEP
	290	static int max8925_rtc_suspend(struct device *dev)
	291	{
	292	struct platform_device *pdev = to_platform_device(dev);
	293	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	294
	295	if (device_may_wakeup(dev))
	296	chip->wakeup_flag \|= 1 << MAX8925_IRQ_RTC_ALARM0;
	297	return 0;
	298	}
	299	static int max8925_rtc_resume(struct device *dev)
	300	{
	301	struct platform_device *pdev = to_platform_device(dev);
	302	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	303
	304	if (device_may_wakeup(dev))
	305	chip->wakeup_flag &= ~(1 << MAX8925_IRQ_RTC_ALARM0);
	306	return 0;
	307	}
	308	#endif
	309
	310	static SIMPLE_DEV_PM_OPS(max8925_rtc_pm_ops, max8925_rtc_suspend, max8925_rtc_resume);
	311
a39069f6 HZ	312	static struct platform_driver max8925_rtc_driver = {
	313	.driver = {
	314	.name = "max8925-rtc",
74d836c4	315	.pm = &max8925_rtc_pm_ops,
a39069f6 HZ	316	},
a39069f6 HZ	317	.probe = max8925_rtc_probe,
a39069f6 HZ	318	};
a39069f6 HZ	319
0c4eae66	320	module_platform_driver(max8925_rtc_driver);
a39069f6 HZ	321
	322	MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");
	323	MODULE_AUTHOR("Haojian Zhuang <[email protected]>");
	324	MODULE_LICENSE("GPL");
	325