[linux.git] / drivers / rtc / rtc-lp8788.c

/*
 * TI LP8788 MFD - rtc driver
 *
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <[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/err.h>
#include <linux/irqdomain.h>
#include <linux/mfd/lp8788.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/slab.h>

/* register address */
#define LP8788_INTEN_3			0x05
#define LP8788_RTC_UNLOCK		0x64
#define LP8788_RTC_SEC			0x70
#define LP8788_ALM1_SEC			0x77
#define LP8788_ALM1_EN			0x7D
#define LP8788_ALM2_SEC			0x7E
#define LP8788_ALM2_EN			0x84

/* mask/shift bits */
#define LP8788_INT_RTC_ALM1_M		BIT(1)	/* Addr 05h */
#define LP8788_INT_RTC_ALM1_S		1
#define LP8788_INT_RTC_ALM2_M		BIT(2)	/* Addr 05h */
#define LP8788_INT_RTC_ALM2_S		2
#define LP8788_ALM_EN_M			BIT(7)	/* Addr 7Dh or 84h */
#define LP8788_ALM_EN_S			7

#define DEFAULT_ALARM_SEL		LP8788_ALARM_1
#define LP8788_MONTH_OFFSET		1
#define LP8788_BASE_YEAR		2000
#define MAX_WDAY_BITS			7
#define LP8788_WDAY_SET			1
#define RTC_UNLOCK			0x1
#define RTC_LATCH			0x2
#define ALARM_IRQ_FLAG			(RTC_IRQF | RTC_AF)

enum lp8788_time {
	LPTIME_SEC,
	LPTIME_MIN,
	LPTIME_HOUR,
	LPTIME_MDAY,
	LPTIME_MON,
	LPTIME_YEAR,
	LPTIME_WDAY,
	LPTIME_MAX,
};

struct lp8788_rtc {
	struct lp8788 *lp;
	struct rtc_device *rdev;
	enum lp8788_alarm_sel alarm;
	int irq;
};

static const u8 addr_alarm_sec[LP8788_ALARM_MAX] = {
	LP8788_ALM1_SEC,
	LP8788_ALM2_SEC,
};

static const u8 addr_alarm_en[LP8788_ALARM_MAX] = {
	LP8788_ALM1_EN,
	LP8788_ALM2_EN,
};

static const u8 mask_alarm_en[LP8788_ALARM_MAX] = {
	LP8788_INT_RTC_ALM1_M,
	LP8788_INT_RTC_ALM2_M,
};

static const u8 shift_alarm_en[LP8788_ALARM_MAX] = {
	LP8788_INT_RTC_ALM1_S,
	LP8788_INT_RTC_ALM2_S,
};

static int _to_tm_wday(u8 lp8788_wday)
{
	int i;

	if (lp8788_wday == 0)
		return 0;

	/* lookup defined weekday from read register value */
	for (i = 0; i < MAX_WDAY_BITS; i++) {
		if ((lp8788_wday >> i) == LP8788_WDAY_SET)
			break;
	}

	return i + 1;
}

static inline int _to_lp8788_wday(int tm_wday)
{
	return LP8788_WDAY_SET << (tm_wday - 1);
}

static void lp8788_rtc_unlock(struct lp8788 *lp)
{
	lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_UNLOCK);
	lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_LATCH);
}

static int lp8788_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
	struct lp8788 *lp = rtc->lp;
	u8 data[LPTIME_MAX];
	int ret;

	lp8788_rtc_unlock(lp);

	ret = lp8788_read_multi_bytes(lp, LP8788_RTC_SEC, data,	LPTIME_MAX);
	if (ret)
		return ret;

	tm->tm_sec  = data[LPTIME_SEC];
	tm->tm_min  = data[LPTIME_MIN];
	tm->tm_hour = data[LPTIME_HOUR];
	tm->tm_mday = data[LPTIME_MDAY];
	tm->tm_mon  = data[LPTIME_MON] - LP8788_MONTH_OFFSET;
	tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900;
	tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]);

	return 0;
}

static int lp8788_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
	struct lp8788 *lp = rtc->lp;
	u8 data[LPTIME_MAX - 1];
	int ret, i, year;

	year = tm->tm_year + 1900 - LP8788_BASE_YEAR;
	if (year < 0) {
		dev_err(lp->dev, "invalid year: %d\n", year);
		return -EINVAL;
	}

	/* because rtc weekday is a readonly register, do not update */
	data[LPTIME_SEC]  = tm->tm_sec;
	data[LPTIME_MIN]  = tm->tm_min;
	data[LPTIME_HOUR] = tm->tm_hour;
	data[LPTIME_MDAY] = tm->tm_mday;
	data[LPTIME_MON]  = tm->tm_mon + LP8788_MONTH_OFFSET;
	data[LPTIME_YEAR] = year;

	for (i = 0; i < ARRAY_SIZE(data); i++) {
		ret = lp8788_write_byte(lp, LP8788_RTC_SEC + i, data[i]);
		if (ret)
			return ret;
	}

	return 0;
}

static int lp8788_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
	struct lp8788 *lp = rtc->lp;
	struct rtc_time *tm = &alarm->time;
	u8 addr, data[LPTIME_MAX];
	int ret;

	addr = addr_alarm_sec[rtc->alarm];
	ret = lp8788_read_multi_bytes(lp, addr, data, LPTIME_MAX);
	if (ret)
		return ret;

	tm->tm_sec  = data[LPTIME_SEC];
	tm->tm_min  = data[LPTIME_MIN];
	tm->tm_hour = data[LPTIME_HOUR];
	tm->tm_mday = data[LPTIME_MDAY];
	tm->tm_mon  = data[LPTIME_MON] - LP8788_MONTH_OFFSET;
	tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900;
	tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]);
	alarm->enabled = data[LPTIME_WDAY] & LP8788_ALM_EN_M;

	return 0;
}

static int lp8788_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
	struct lp8788 *lp = rtc->lp;
	struct rtc_time *tm = &alarm->time;
	u8 addr, data[LPTIME_MAX];
	int ret, i, year;

	year = tm->tm_year + 1900 - LP8788_BASE_YEAR;
	if (year < 0) {
		dev_err(lp->dev, "invalid year: %d\n", year);
		return -EINVAL;
	}

	data[LPTIME_SEC]  = tm->tm_sec;
	data[LPTIME_MIN]  = tm->tm_min;
	data[LPTIME_HOUR] = tm->tm_hour;
	data[LPTIME_MDAY] = tm->tm_mday;
	data[LPTIME_MON]  = tm->tm_mon + LP8788_MONTH_OFFSET;
	data[LPTIME_YEAR] = year;
	data[LPTIME_WDAY] = _to_lp8788_wday(tm->tm_wday);

	for (i = 0; i < ARRAY_SIZE(data); i++) {
		addr = addr_alarm_sec[rtc->alarm] + i;
		ret = lp8788_write_byte(lp, addr, data[i]);
		if (ret)
			return ret;
	}

	alarm->enabled = 1;
	addr = addr_alarm_en[rtc->alarm];

	return lp8788_update_bits(lp, addr, LP8788_ALM_EN_M,
				alarm->enabled << LP8788_ALM_EN_S);
}

static int lp8788_alarm_irq_enable(struct device *dev, unsigned int enable)
{
	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
	struct lp8788 *lp = rtc->lp;
	u8 mask, shift;

	if (!rtc->irq)
		return -EIO;

	mask = mask_alarm_en[rtc->alarm];
	shift = shift_alarm_en[rtc->alarm];

	return lp8788_update_bits(lp, LP8788_INTEN_3, mask, enable << shift);
}

static const struct rtc_class_ops lp8788_rtc_ops = {
	.read_time = lp8788_rtc_read_time,
	.set_time = lp8788_rtc_set_time,
	.read_alarm = lp8788_read_alarm,
	.set_alarm = lp8788_set_alarm,
	.alarm_irq_enable = lp8788_alarm_irq_enable,
};

static irqreturn_t lp8788_alarm_irq_handler(int irq, void *ptr)
{
	struct lp8788_rtc *rtc = ptr;

	rtc_update_irq(rtc->rdev, 1, ALARM_IRQ_FLAG);
	return IRQ_HANDLED;
}

static int lp8788_alarm_irq_register(struct platform_device *pdev,
				struct lp8788_rtc *rtc)
{
	struct resource *r;
	struct lp8788 *lp = rtc->lp;
	struct irq_domain *irqdm = lp->irqdm;
	int irq;

	rtc->irq = 0;

	/* even the alarm IRQ number is not specified, rtc time should work */
	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, LP8788_ALM_IRQ);
	if (!r)
		return 0;

	if (rtc->alarm == LP8788_ALARM_1)
		irq = r->start;
	else
		irq = r->end;

	rtc->irq = irq_create_mapping(irqdm, irq);

	return devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
				lp8788_alarm_irq_handler,
				0, LP8788_ALM_IRQ, rtc);
}

static int lp8788_rtc_probe(struct platform_device *pdev)
{
	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
	struct lp8788_rtc *rtc;
	struct device *dev = &pdev->dev;

	rtc = devm_kzalloc(dev, sizeof(struct lp8788_rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	rtc->lp = lp;
	rtc->alarm = lp->pdata ? lp->pdata->alarm_sel : DEFAULT_ALARM_SEL;
	platform_set_drvdata(pdev, rtc);

	device_init_wakeup(dev, 1);

	rtc->rdev = devm_rtc_device_register(dev, "lp8788_rtc",
					&lp8788_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rdev)) {
		dev_err(dev, "can not register rtc device\n");
		return PTR_ERR(rtc->rdev);
	}

	if (lp8788_alarm_irq_register(pdev, rtc))
		dev_warn(lp->dev, "no rtc irq handler\n");

	return 0;
}

static int lp8788_rtc_remove(struct platform_device *pdev)
{
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver lp8788_rtc_driver = {
	.probe = lp8788_rtc_probe,
	.remove = lp8788_rtc_remove,
	.driver = {
		.name = LP8788_DEV_RTC,
		.owner = THIS_MODULE,
	},
};
module_platform_driver(lp8788_rtc_driver);

MODULE_DESCRIPTION("Texas Instruments LP8788 RTC Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lp8788-rtc");
Commit	Line	Data
38ae176e KM	1	/*
	2	* TI LP8788 MFD - rtc driver
	3	*
	4	* Copyright 2012 Texas Instruments
	5	*
	6	* Author: Milo(Woogyom) Kim <[email protected]>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/err.h>
	15	#include <linux/irqdomain.h>
	16	#include <linux/mfd/lp8788.h>
	17	#include <linux/module.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/rtc.h>
	20	#include <linux/slab.h>
	21
	22	/* register address */
	23	#define LP8788_INTEN_3 0x05
	24	#define LP8788_RTC_UNLOCK 0x64
	25	#define LP8788_RTC_SEC 0x70
	26	#define LP8788_ALM1_SEC 0x77
	27	#define LP8788_ALM1_EN 0x7D
	28	#define LP8788_ALM2_SEC 0x7E
	29	#define LP8788_ALM2_EN 0x84
	30
	31	/* mask/shift bits */
	32	#define LP8788_INT_RTC_ALM1_M BIT(1) /* Addr 05h */
	33	#define LP8788_INT_RTC_ALM1_S 1
	34	#define LP8788_INT_RTC_ALM2_M BIT(2) /* Addr 05h */
	35	#define LP8788_INT_RTC_ALM2_S 2
	36	#define LP8788_ALM_EN_M BIT(7) /* Addr 7Dh or 84h */
	37	#define LP8788_ALM_EN_S 7
	38
	39	#define DEFAULT_ALARM_SEL LP8788_ALARM_1
	40	#define LP8788_MONTH_OFFSET 1
	41	#define LP8788_BASE_YEAR 2000
	42	#define MAX_WDAY_BITS 7
	43	#define LP8788_WDAY_SET 1
	44	#define RTC_UNLOCK 0x1
	45	#define RTC_LATCH 0x2
	46	#define ALARM_IRQ_FLAG (RTC_IRQF \| RTC_AF)
	47
	48	enum lp8788_time {
	49	LPTIME_SEC,
	50	LPTIME_MIN,
	51	LPTIME_HOUR,
	52	LPTIME_MDAY,
	53	LPTIME_MON,
	54	LPTIME_YEAR,
	55	LPTIME_WDAY,
	56	LPTIME_MAX,
	57	};
	58
	59	struct lp8788_rtc {
	60	struct lp8788 *lp;
	61	struct rtc_device *rdev;
	62	enum lp8788_alarm_sel alarm;
	63	int irq;
	64	};
65
66	static const u8 addr_alarm_sec[LP8788_ALARM_MAX] = {
67	LP8788_ALM1_SEC,
68	LP8788_ALM2_SEC,
69	};
70
71	static const u8 addr_alarm_en[LP8788_ALARM_MAX] = {
72	LP8788_ALM1_EN,
73	LP8788_ALM2_EN,
74	};
75
76	static const u8 mask_alarm_en[LP8788_ALARM_MAX] = {
77	LP8788_INT_RTC_ALM1_M,
78	LP8788_INT_RTC_ALM2_M,
79	};
80
81	static const u8 shift_alarm_en[LP8788_ALARM_MAX] = {
82	LP8788_INT_RTC_ALM1_S,
83	LP8788_INT_RTC_ALM2_S,
84	};
85
86	static int _to_tm_wday(u8 lp8788_wday)
87	{
88	int i;
89
90	if (lp8788_wday == 0)
91	return 0;
92
93	/* lookup defined weekday from read register value */
94	for (i = 0; i < MAX_WDAY_BITS; i++) {
95	if ((lp8788_wday >> i) == LP8788_WDAY_SET)
96	break;
97	}
98
99	return i + 1;
100	}
101
102	static inline int _to_lp8788_wday(int tm_wday)
103	{
104	return LP8788_WDAY_SET << (tm_wday - 1);
105	}
106
107	static void lp8788_rtc_unlock(struct lp8788 *lp)
108	{
109	lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_UNLOCK);
110	lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_LATCH);
111	}
112
113	static int lp8788_rtc_read_time(struct device dev, struct rtc_time tm)
114	{
115	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
116	struct lp8788 *lp = rtc->lp;
117	u8 data[LPTIME_MAX];
118	int ret;
119
120	lp8788_rtc_unlock(lp);
121
122	ret = lp8788_read_multi_bytes(lp, LP8788_RTC_SEC, data, LPTIME_MAX);
123	if (ret)
124	return ret;
125
126	tm->tm_sec = data[LPTIME_SEC];
127	tm->tm_min = data[LPTIME_MIN];
128	tm->tm_hour = data[LPTIME_HOUR];
129	tm->tm_mday = data[LPTIME_MDAY];
130	tm->tm_mon = data[LPTIME_MON] - LP8788_MONTH_OFFSET;
131	tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900;
132	tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]);
133
134	return 0;
135	}
136
137	static int lp8788_rtc_set_time(struct device dev, struct rtc_time tm)
138	{
139	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
140	struct lp8788 *lp = rtc->lp;
141	u8 data[LPTIME_MAX - 1];
142	int ret, i, year;
143
144	year = tm->tm_year + 1900 - LP8788_BASE_YEAR;
145	if (year < 0) {
146	dev_err(lp->dev, "invalid year: %d\n", year);
147	return -EINVAL;
148	}
149
150	/* because rtc weekday is a readonly register, do not update */
151	data[LPTIME_SEC] = tm->tm_sec;
152	data[LPTIME_MIN] = tm->tm_min;
153	data[LPTIME_HOUR] = tm->tm_hour;
154	data[LPTIME_MDAY] = tm->tm_mday;
155	data[LPTIME_MON] = tm->tm_mon + LP8788_MONTH_OFFSET;
156	data[LPTIME_YEAR] = year;
157
158	for (i = 0; i < ARRAY_SIZE(data); i++) {
159	ret = lp8788_write_byte(lp, LP8788_RTC_SEC + i, data[i]);
160	if (ret)
161	return ret;
162	}
163
164	return 0;
165	}
166
167	static int lp8788_read_alarm(struct device dev, struct rtc_wkalrm alarm)
168	{
169	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
170	struct lp8788 *lp = rtc->lp;
171	struct rtc_time *tm = &alarm->time;
172	u8 addr, data[LPTIME_MAX];
173	int ret;
174
175	addr = addr_alarm_sec[rtc->alarm];
176	ret = lp8788_read_multi_bytes(lp, addr, data, LPTIME_MAX);
177	if (ret)
178	return ret;
179
180	tm->tm_sec = data[LPTIME_SEC];
181	tm->tm_min = data[LPTIME_MIN];
182	tm->tm_hour = data[LPTIME_HOUR];
183	tm->tm_mday = data[LPTIME_MDAY];
184	tm->tm_mon = data[LPTIME_MON] - LP8788_MONTH_OFFSET;
185	tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900;
186	tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]);
187	alarm->enabled = data[LPTIME_WDAY] & LP8788_ALM_EN_M;
188
189	return 0;
190	}
191
192	static int lp8788_set_alarm(struct device dev, struct rtc_wkalrm alarm)
193	{
194	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
195	struct lp8788 *lp = rtc->lp;
196	struct rtc_time *tm = &alarm->time;
197	u8 addr, data[LPTIME_MAX];
198	int ret, i, year;
199
200	year = tm->tm_year + 1900 - LP8788_BASE_YEAR;
201	if (year < 0) {
202	dev_err(lp->dev, "invalid year: %d\n", year);
203	return -EINVAL;
204	}
205
206	data[LPTIME_SEC] = tm->tm_sec;
207	data[LPTIME_MIN] = tm->tm_min;
208	data[LPTIME_HOUR] = tm->tm_hour;
209	data[LPTIME_MDAY] = tm->tm_mday;
210	data[LPTIME_MON] = tm->tm_mon + LP8788_MONTH_OFFSET;
211	data[LPTIME_YEAR] = year;
212	data[LPTIME_WDAY] = _to_lp8788_wday(tm->tm_wday);
213
214	for (i = 0; i < ARRAY_SIZE(data); i++) {
215	addr = addr_alarm_sec[rtc->alarm] + i;
216	ret = lp8788_write_byte(lp, addr, data[i]);
217	if (ret)
218	return ret;
219	}
220
221	alarm->enabled = 1;
222	addr = addr_alarm_en[rtc->alarm];
223
224	return lp8788_update_bits(lp, addr, LP8788_ALM_EN_M,
225	alarm->enabled << LP8788_ALM_EN_S);
226	}
227
228	static int lp8788_alarm_irq_enable(struct device *dev, unsigned int enable)
229	{
230	struct lp8788_rtc *rtc = dev_get_drvdata(dev);
231	struct lp8788 *lp = rtc->lp;
232	u8 mask, shift;
233
234	if (!rtc->irq)
235	return -EIO;
236
237	mask = mask_alarm_en[rtc->alarm];
238	shift = shift_alarm_en[rtc->alarm];
239
240	return lp8788_update_bits(lp, LP8788_INTEN_3, mask, enable << shift);
241	}
242
243	static const struct rtc_class_ops lp8788_rtc_ops = {
244	.read_time = lp8788_rtc_read_time,
245	.set_time = lp8788_rtc_set_time,
246	.read_alarm = lp8788_read_alarm,
247	.set_alarm = lp8788_set_alarm,
248	.alarm_irq_enable = lp8788_alarm_irq_enable,
249	};
250
251	static irqreturn_t lp8788_alarm_irq_handler(int irq, void *ptr)
252	{
253	struct lp8788_rtc *rtc = ptr;
254
255	rtc_update_irq(rtc->rdev, 1, ALARM_IRQ_FLAG);
256	return IRQ_HANDLED;
257	}
258
259	static int lp8788_alarm_irq_register(struct platform_device *pdev,
260	struct lp8788_rtc *rtc)
261	{
262	struct resource *r;
263	struct lp8788 *lp = rtc->lp;
264	struct irq_domain *irqdm = lp->irqdm;
265	int irq;
266
267	rtc->irq = 0;
268
269	/* even the alarm IRQ number is not specified, rtc time should work */
270	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, LP8788_ALM_IRQ);
271	if (!r)
272	return 0;
273
274	if (rtc->alarm == LP8788_ALARM_1)
275	irq = r->start;
276	else
277	irq = r->end;
278
279	rtc->irq = irq_create_mapping(irqdm, irq);
280
14b149eb JH	281	return devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
14b149eb JH	282	lp8788_alarm_irq_handler,
38ae176e KM	283	0, LP8788_ALM_IRQ, rtc);
	284	}
	285
38ae176e KM	286	static int lp8788_rtc_probe(struct platform_device *pdev)
	287	{
	288	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
	289	struct lp8788_rtc *rtc;
	290	struct device *dev = &pdev->dev;
	291
	292	rtc = devm_kzalloc(dev, sizeof(struct lp8788_rtc), GFP_KERNEL);
	293	if (!rtc)
	294	return -ENOMEM;
	295
	296	rtc->lp = lp;
	297	rtc->alarm = lp->pdata ? lp->pdata->alarm_sel : DEFAULT_ALARM_SEL;
	298	platform_set_drvdata(pdev, rtc);
	299
	300	device_init_wakeup(dev, 1);
	301
448d3367	302	rtc->rdev = devm_rtc_device_register(dev, "lp8788_rtc",
38ae176e KM	303	&lp8788_rtc_ops, THIS_MODULE);
	304	if (IS_ERR(rtc->rdev)) {
	305	dev_err(dev, "can not register rtc device\n");
	306	return PTR_ERR(rtc->rdev);
	307	}
	308
	309	if (lp8788_alarm_irq_register(pdev, rtc))
	310	dev_warn(lp->dev, "no rtc irq handler\n");
	311
	312	return 0;
	313	}
	314
	315	static int lp8788_rtc_remove(struct platform_device *pdev)
	316	{
38ae176e KM	317	platform_set_drvdata(pdev, NULL);
	318
	319	return 0;
	320	}
	321
	322	static struct platform_driver lp8788_rtc_driver = {
	323	.probe = lp8788_rtc_probe,
	324	.remove = lp8788_rtc_remove,
	325	.driver = {
	326	.name = LP8788_DEV_RTC,
	327	.owner = THIS_MODULE,
	328	},
	329	};
	330	module_platform_driver(lp8788_rtc_driver);
	331
	332	MODULE_DESCRIPTION("Texas Instruments LP8788 RTC Driver");
	333	MODULE_AUTHOR("Milo Kim");
	334	MODULE_LICENSE("GPL");
	335	MODULE_ALIAS("platform:lp8788-rtc");