[linux-2.6-block.git] / drivers / rtc / rtc-max77802.c

/*
 * RTC driver for Maxim MAX77802
 *
 * Copyright (C) 2013 Google, Inc
 *
 * Copyright (C) 2012 Samsung Electronics Co.Ltd
 *
 *  based on rtc-max8997.c
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/max77686-private.h>
#include <linux/irqdomain.h>
#include <linux/regmap.h>

/* RTC Control Register */
#define BCD_EN_SHIFT			0
#define BCD_EN_MASK			(1 << BCD_EN_SHIFT)
#define MODEL24_SHIFT			1
#define MODEL24_MASK			(1 << MODEL24_SHIFT)
/* RTC Update Register1 */
#define RTC_UDR_SHIFT			0
#define RTC_UDR_MASK			(1 << RTC_UDR_SHIFT)
#define RTC_RBUDR_SHIFT			4
#define RTC_RBUDR_MASK			(1 << RTC_RBUDR_SHIFT)
/* RTC Hour register */
#define HOUR_PM_SHIFT			6
#define HOUR_PM_MASK			(1 << HOUR_PM_SHIFT)
/* RTC Alarm Enable */
#define ALARM_ENABLE_SHIFT		7
#define ALARM_ENABLE_MASK		(1 << ALARM_ENABLE_SHIFT)

/* For the RTCAE1 register, we write this value to enable the alarm */
#define ALARM_ENABLE_VALUE		0x77

#define MAX77802_RTC_UPDATE_DELAY_US	200

enum {
	RTC_SEC = 0,
	RTC_MIN,
	RTC_HOUR,
	RTC_WEEKDAY,
	RTC_MONTH,
	RTC_YEAR,
	RTC_DATE,
	RTC_NR_TIME
};

struct max77802_rtc_info {
	struct device		*dev;
	struct max77686_dev	*max77802;
	struct i2c_client	*rtc;
	struct rtc_device	*rtc_dev;
	struct mutex		lock;

	struct regmap		*regmap;

	int virq;
	int rtc_24hr_mode;
};

enum MAX77802_RTC_OP {
	MAX77802_RTC_WRITE,
	MAX77802_RTC_READ,
};

static void max77802_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
				   int rtc_24hr_mode)
{
	tm->tm_sec = data[RTC_SEC] & 0xff;
	tm->tm_min = data[RTC_MIN] & 0xff;
	if (rtc_24hr_mode)
		tm->tm_hour = data[RTC_HOUR] & 0x1f;
	else {
		tm->tm_hour = data[RTC_HOUR] & 0x0f;
		if (data[RTC_HOUR] & HOUR_PM_MASK)
			tm->tm_hour += 12;
	}

	/* Only a single bit is set in data[], so fls() would be equivalent */
	tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0xff) - 1;
	tm->tm_mday = data[RTC_DATE] & 0x1f;
	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;

	tm->tm_year = data[RTC_YEAR] & 0xff;
	tm->tm_yday = 0;
	tm->tm_isdst = 0;
}

static int max77802_rtc_tm_to_data(struct rtc_time *tm, u8 *data)
{
	data[RTC_SEC] = tm->tm_sec;
	data[RTC_MIN] = tm->tm_min;
	data[RTC_HOUR] = tm->tm_hour;
	data[RTC_WEEKDAY] = 1 << tm->tm_wday;
	data[RTC_DATE] = tm->tm_mday;
	data[RTC_MONTH] = tm->tm_mon + 1;
	data[RTC_YEAR] = tm->tm_year;

	return 0;
}

static int max77802_rtc_update(struct max77802_rtc_info *info,
	enum MAX77802_RTC_OP op)
{
	int ret;
	unsigned int data;

	if (op == MAX77802_RTC_WRITE)
		data = 1 << RTC_UDR_SHIFT;
	else
		data = 1 << RTC_RBUDR_SHIFT;

	ret = regmap_update_bits(info->max77802->regmap,
				 MAX77802_RTC_UPDATE0, data, data);
	if (ret < 0)
		dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n",
				__func__, ret, data);
	else {
		/* Minimum delay required before RTC update. */
		usleep_range(MAX77802_RTC_UPDATE_DELAY_US,
			     MAX77802_RTC_UPDATE_DELAY_US * 2);
	}

	return ret;
}

static int max77802_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct max77802_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	int ret;

	mutex_lock(&info->lock);

	ret = max77802_rtc_update(info, MAX77802_RTC_READ);
	if (ret < 0)
		goto out;

	ret = regmap_bulk_read(info->max77802->regmap,
				MAX77802_RTC_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,
			ret);
		goto out;
	}

	max77802_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);

	ret = rtc_valid_tm(tm);

out:
	mutex_unlock(&info->lock);
	return ret;
}

static int max77802_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct max77802_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	int ret;

	ret = max77802_rtc_tm_to_data(tm, data);
	if (ret < 0)
		return ret;

	mutex_lock(&info->lock);

	ret = regmap_bulk_write(info->max77802->regmap,
				 MAX77802_RTC_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
			ret);
		goto out;
	}

	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);

out:
	mutex_unlock(&info->lock);
	return ret;
}

static int max77802_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct max77802_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	unsigned int val;
	int ret;

	mutex_lock(&info->lock);

	ret = max77802_rtc_update(info, MAX77802_RTC_READ);
	if (ret < 0)
		goto out;

	ret = regmap_bulk_read(info->max77802->regmap,
				 MAX77802_ALARM1_SEC, data, RTC_NR_TIME);
	if (ret < 0) {
		dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
				__func__, __LINE__, ret);
		goto out;
	}

	max77802_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);

	alrm->enabled = 0;
	ret = regmap_read(info->max77802->regmap,
			  MAX77802_RTC_AE1, &val);
	if (ret < 0) {
		dev_err(info->dev, "%s:%d fail to read alarm enable(%d)\n",
			__func__, __LINE__, ret);
		goto out;
	}
	if (val)
		alrm->enabled = 1;

	alrm->pending = 0;
	ret = regmap_read(info->max77802->regmap, MAX77802_REG_STATUS2, &val);
	if (ret < 0) {
		dev_err(info->dev, "%s:%d fail to read status2 reg(%d)\n",
				__func__, __LINE__, ret);
		goto out;
	}

	if (val & (1 << 2)) /* RTCA1 */
		alrm->pending = 1;

out:
	mutex_unlock(&info->lock);
	return 0;
}

static int max77802_rtc_stop_alarm(struct max77802_rtc_info *info)
{
	int ret;

	if (!mutex_is_locked(&info->lock))
		dev_warn(info->dev, "%s: should have mutex locked\n", __func__);

	ret = max77802_rtc_update(info, MAX77802_RTC_READ);
	if (ret < 0)
		goto out;

	ret = regmap_write(info->max77802->regmap,
			   MAX77802_RTC_AE1, 0);
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
			__func__, ret);
		goto out;
	}

	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
out:
	return ret;
}

static int max77802_rtc_start_alarm(struct max77802_rtc_info *info)
{
	int ret;

	if (!mutex_is_locked(&info->lock))
		dev_warn(info->dev, "%s: should have mutex locked\n",
			 __func__);

	ret = max77802_rtc_update(info, MAX77802_RTC_READ);
	if (ret < 0)
		goto out;

	ret = regmap_write(info->max77802->regmap,
				   MAX77802_RTC_AE1,
				   ALARM_ENABLE_VALUE);

	if (ret < 0) {
		dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
out:
	return ret;
}

static int max77802_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct max77802_rtc_info *info = dev_get_drvdata(dev);
	u8 data[RTC_NR_TIME];
	int ret;

	ret = max77802_rtc_tm_to_data(&alrm->time, data);
	if (ret < 0)
		return ret;

	mutex_lock(&info->lock);

	ret = max77802_rtc_stop_alarm(info);
	if (ret < 0)
		goto out;

	ret = regmap_bulk_write(info->max77802->regmap,
				 MAX77802_ALARM1_SEC, data, RTC_NR_TIME);

	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
				__func__, ret);
		goto out;
	}

	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
	if (ret < 0)
		goto out;

	if (alrm->enabled)
		ret = max77802_rtc_start_alarm(info);
out:
	mutex_unlock(&info->lock);
	return ret;
}

static int max77802_rtc_alarm_irq_enable(struct device *dev,
					 unsigned int enabled)
{
	struct max77802_rtc_info *info = dev_get_drvdata(dev);
	int ret;

	mutex_lock(&info->lock);
	if (enabled)
		ret = max77802_rtc_start_alarm(info);
	else
		ret = max77802_rtc_stop_alarm(info);
	mutex_unlock(&info->lock);

	return ret;
}

static irqreturn_t max77802_rtc_alarm_irq(int irq, void *data)
{
	struct max77802_rtc_info *info = data;

	dev_dbg(info->dev, "%s:irq(%d)\n", __func__, irq);

	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);

	return IRQ_HANDLED;
}

static const struct rtc_class_ops max77802_rtc_ops = {
	.read_time = max77802_rtc_read_time,
	.set_time = max77802_rtc_set_time,
	.read_alarm = max77802_rtc_read_alarm,
	.set_alarm = max77802_rtc_set_alarm,
	.alarm_irq_enable = max77802_rtc_alarm_irq_enable,
};

static int max77802_rtc_init_reg(struct max77802_rtc_info *info)
{
	u8 data[2];
	int ret;

	max77802_rtc_update(info, MAX77802_RTC_READ);

	/* Set RTC control register : Binary mode, 24hour mdoe */
	data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
	data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);

	info->rtc_24hr_mode = 1;

	ret = regmap_bulk_write(info->max77802->regmap,
				MAX77802_RTC_CONTROLM, data, ARRAY_SIZE(data));
	if (ret < 0) {
		dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
				__func__, ret);
		return ret;
	}

	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
	return ret;
}

static int max77802_rtc_probe(struct platform_device *pdev)
{
	struct max77686_dev *max77802 = dev_get_drvdata(pdev->dev.parent);
	struct max77802_rtc_info *info;
	int ret;

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

	info = devm_kzalloc(&pdev->dev, sizeof(struct max77802_rtc_info),
			    GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	mutex_init(&info->lock);
	info->dev = &pdev->dev;
	info->max77802 = max77802;
	info->rtc = max77802->i2c;

	platform_set_drvdata(pdev, info);

	ret = max77802_rtc_init_reg(info);

	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
		return ret;
	}

	device_init_wakeup(&pdev->dev, 1);

	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77802-rtc",
						 &max77802_rtc_ops, THIS_MODULE);

	if (IS_ERR(info->rtc_dev)) {
		ret = PTR_ERR(info->rtc_dev);
		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
		if (ret == 0)
			ret = -EINVAL;
		return ret;
	}

	if (!max77802->rtc_irq_data) {
		dev_err(&pdev->dev, "No RTC regmap IRQ chip\n");
		return -EINVAL;
	}

	info->virq = regmap_irq_get_virq(max77802->rtc_irq_data,
					 MAX77686_RTCIRQ_RTCA1);

	if (info->virq <= 0) {
		dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
			MAX77686_RTCIRQ_RTCA1);
		return -EINVAL;
	}

	ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL,
					max77802_rtc_alarm_irq, 0, "rtc-alarm1",
					info);
	if (ret < 0)
		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
			info->virq, ret);

	return ret;
}

#ifdef CONFIG_PM_SLEEP
static int max77802_rtc_suspend(struct device *dev)
{
	if (device_may_wakeup(dev)) {
		struct max77802_rtc_info *info = dev_get_drvdata(dev);

		return enable_irq_wake(info->virq);
	}

	return 0;
}

static int max77802_rtc_resume(struct device *dev)
{
	if (device_may_wakeup(dev)) {
		struct max77802_rtc_info *info = dev_get_drvdata(dev);

		return disable_irq_wake(info->virq);
	}

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(max77802_rtc_pm_ops,
			 max77802_rtc_suspend, max77802_rtc_resume);

static const struct platform_device_id rtc_id[] = {
	{ "max77802-rtc", 0 },
	{},
};
MODULE_DEVICE_TABLE(platform, rtc_id);

static struct platform_driver max77802_rtc_driver = {
	.driver		= {
		.name	= "max77802-rtc",
		.pm	= &max77802_rtc_pm_ops,
	},
	.probe		= max77802_rtc_probe,
	.id_table	= rtc_id,
};

module_platform_driver(max77802_rtc_driver);

MODULE_DESCRIPTION("Maxim MAX77802 RTC driver");
MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
MODULE_LICENSE("GPL");
Commit	Line	Data
a4d4121b JMC	1	/*
	2	* RTC driver for Maxim MAX77802
	3	*
	4	* Copyright (C) 2013 Google, Inc
	5	*
	6	* Copyright (C) 2012 Samsung Electronics Co.Ltd
	7	*
	8	* based on rtc-max8997.c
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*
	15	*/
	16
	17	#include <linux/slab.h>
	18	#include <linux/rtc.h>
	19	#include <linux/delay.h>
	20	#include <linux/mutex.h>
	21	#include <linux/module.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/mfd/max77686-private.h>
	24	#include <linux/irqdomain.h>
	25	#include <linux/regmap.h>
	26
	27	/* RTC Control Register */
	28	#define BCD_EN_SHIFT 0
	29	#define BCD_EN_MASK (1 << BCD_EN_SHIFT)
	30	#define MODEL24_SHIFT 1
	31	#define MODEL24_MASK (1 << MODEL24_SHIFT)
	32	/* RTC Update Register1 */
	33	#define RTC_UDR_SHIFT 0
	34	#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT)
	35	#define RTC_RBUDR_SHIFT 4
	36	#define RTC_RBUDR_MASK (1 << RTC_RBUDR_SHIFT)
	37	/* RTC Hour register */
	38	#define HOUR_PM_SHIFT 6
	39	#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT)
	40	/* RTC Alarm Enable */
	41	#define ALARM_ENABLE_SHIFT 7
	42	#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT)
	43
	44	/* For the RTCAE1 register, we write this value to enable the alarm */
	45	#define ALARM_ENABLE_VALUE 0x77
	46
	47	#define MAX77802_RTC_UPDATE_DELAY_US 200
	48
	49	enum {
	50	RTC_SEC = 0,
	51	RTC_MIN,
	52	RTC_HOUR,
	53	RTC_WEEKDAY,
	54	RTC_MONTH,
	55	RTC_YEAR,
	56	RTC_DATE,
	57	RTC_NR_TIME
	58	};
	59
	60	struct max77802_rtc_info {
	61	struct device *dev;
	62	struct max77686_dev *max77802;
	63	struct i2c_client *rtc;
	64	struct rtc_device *rtc_dev;
65	struct mutex lock;
66
67	struct regmap *regmap;
68
69	int virq;
70	int rtc_24hr_mode;
71	};
72
73	enum MAX77802_RTC_OP {
74	MAX77802_RTC_WRITE,
75	MAX77802_RTC_READ,
76	};
77
78	static void max77802_rtc_data_to_tm(u8 data, struct rtc_time tm,
79	int rtc_24hr_mode)
80	{
81	tm->tm_sec = data[RTC_SEC] & 0xff;
82	tm->tm_min = data[RTC_MIN] & 0xff;
83	if (rtc_24hr_mode)
84	tm->tm_hour = data[RTC_HOUR] & 0x1f;
85	else {
86	tm->tm_hour = data[RTC_HOUR] & 0x0f;
87	if (data[RTC_HOUR] & HOUR_PM_MASK)
88	tm->tm_hour += 12;
89	}
90
91	/* Only a single bit is set in data[], so fls() would be equivalent */
92	tm->tm_wday = ffs(data[RTC_WEEKDAY] & 0xff) - 1;
93	tm->tm_mday = data[RTC_DATE] & 0x1f;
94	tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
95
96	tm->tm_year = data[RTC_YEAR] & 0xff;
97	tm->tm_yday = 0;
98	tm->tm_isdst = 0;
99	}
100
101	static int max77802_rtc_tm_to_data(struct rtc_time tm, u8 data)
102	{
103	data[RTC_SEC] = tm->tm_sec;
104	data[RTC_MIN] = tm->tm_min;
105	data[RTC_HOUR] = tm->tm_hour;
106	data[RTC_WEEKDAY] = 1 << tm->tm_wday;
107	data[RTC_DATE] = tm->tm_mday;
108	data[RTC_MONTH] = tm->tm_mon + 1;
109	data[RTC_YEAR] = tm->tm_year;
110
111	return 0;
112	}
113
114	static int max77802_rtc_update(struct max77802_rtc_info *info,
115	enum MAX77802_RTC_OP op)
116	{
117	int ret;
118	unsigned int data;
119
120	if (op == MAX77802_RTC_WRITE)
121	data = 1 << RTC_UDR_SHIFT;
122	else
123	data = 1 << RTC_RBUDR_SHIFT;
124
125	ret = regmap_update_bits(info->max77802->regmap,
126	MAX77802_RTC_UPDATE0, data, data);
127	if (ret < 0)
128	dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n",
129	__func__, ret, data);
130	else {
131	/* Minimum delay required before RTC update. */
132	usleep_range(MAX77802_RTC_UPDATE_DELAY_US,
133	MAX77802_RTC_UPDATE_DELAY_US * 2);
134	}
135
136	return ret;
137	}
138
139	static int max77802_rtc_read_time(struct device dev, struct rtc_time tm)
140	{
141	struct max77802_rtc_info *info = dev_get_drvdata(dev);
142	u8 data[RTC_NR_TIME];
143	int ret;
144
145	mutex_lock(&info->lock);
146
147	ret = max77802_rtc_update(info, MAX77802_RTC_READ);
148	if (ret < 0)
149	goto out;
150
151	ret = regmap_bulk_read(info->max77802->regmap,
152	MAX77802_RTC_SEC, data, RTC_NR_TIME);
153	if (ret < 0) {
154	dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,
155	ret);
156	goto out;
157	}
158
159	max77802_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);
160
161	ret = rtc_valid_tm(tm);
162
163	out:
164	mutex_unlock(&info->lock);
165	return ret;
166	}
167
168	static int max77802_rtc_set_time(struct device dev, struct rtc_time tm)
169	{
170	struct max77802_rtc_info *info = dev_get_drvdata(dev);
171	u8 data[RTC_NR_TIME];
172	int ret;
173
174	ret = max77802_rtc_tm_to_data(tm, data);
175	if (ret < 0)
176	return ret;
177
178	mutex_lock(&info->lock);
179
180	ret = regmap_bulk_write(info->max77802->regmap,
181	MAX77802_RTC_SEC, data, RTC_NR_TIME);
182	if (ret < 0) {
183	dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
184	ret);
185	goto out;
186	}
187
188	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
189
190	out:
191	mutex_unlock(&info->lock);
192	return ret;
193	}
194
195	static int max77802_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
196	{
197	struct max77802_rtc_info *info = dev_get_drvdata(dev);
198	u8 data[RTC_NR_TIME];
199	unsigned int val;
200	int ret;
201
202	mutex_lock(&info->lock);
203
204	ret = max77802_rtc_update(info, MAX77802_RTC_READ);
205	if (ret < 0)
206	goto out;
207
208	ret = regmap_bulk_read(info->max77802->regmap,
209	MAX77802_ALARM1_SEC, data, RTC_NR_TIME);
210	if (ret < 0) {
211	dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
212	__func__, __LINE__, ret);
213	goto out;
214	}
215
216	max77802_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
217
218	alrm->enabled = 0;
219	ret = regmap_read(info->max77802->regmap,
220	MAX77802_RTC_AE1, &val);
221	if (ret < 0) {
222	dev_err(info->dev, "%s:%d fail to read alarm enable(%d)\n",
223	__func__, __LINE__, ret);
224	goto out;
225	}
226	if (val)
227	alrm->enabled = 1;
228
229	alrm->pending = 0;
230	ret = regmap_read(info->max77802->regmap, MAX77802_REG_STATUS2, &val);
231	if (ret < 0) {
232	dev_err(info->dev, "%s:%d fail to read status2 reg(%d)\n",
233	__func__, __LINE__, ret);
234	goto out;
235	}
236
237	if (val & (1 << 2)) /* RTCA1 */
238	alrm->pending = 1;
239
240	out:
241	mutex_unlock(&info->lock);
242	return 0;
243	}
244
245	static int max77802_rtc_stop_alarm(struct max77802_rtc_info *info)
246	{
247	int ret;
248
249	if (!mutex_is_locked(&info->lock))
250	dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
251
252	ret = max77802_rtc_update(info, MAX77802_RTC_READ);
253	if (ret < 0)
254	goto out;
255
256	ret = regmap_write(info->max77802->regmap,
257	MAX77802_RTC_AE1, 0);
258	if (ret < 0) {
259	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
260	__func__, ret);
261	goto out;
262	}
263
264	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
265	out:
266	return ret;
267	}
268
269	static int max77802_rtc_start_alarm(struct max77802_rtc_info *info)
270	{
271	int ret;
272
273	if (!mutex_is_locked(&info->lock))
274	dev_warn(info->dev, "%s: should have mutex locked\n",
275	__func__);
276
277	ret = max77802_rtc_update(info, MAX77802_RTC_READ);
278	if (ret < 0)
279	goto out;
280
281	ret = regmap_write(info->max77802->regmap,
282	MAX77802_RTC_AE1,
283	ALARM_ENABLE_VALUE);
284
285	if (ret < 0) {
286	dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
287	__func__, ret);
288	goto out;
289	}
290
291	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
292	out:
293	return ret;
294	}
295
296	static int max77802_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
297	{
298	struct max77802_rtc_info *info = dev_get_drvdata(dev);
299	u8 data[RTC_NR_TIME];
300	int ret;
301
302	ret = max77802_rtc_tm_to_data(&alrm->time, data);
303	if (ret < 0)
304	return ret;
305
306	mutex_lock(&info->lock);
307
308	ret = max77802_rtc_stop_alarm(info);
309	if (ret < 0)
310	goto out;
311
312	ret = regmap_bulk_write(info->max77802->regmap,
313	MAX77802_ALARM1_SEC, data, RTC_NR_TIME);
314
315	if (ret < 0) {
316	dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
317	__func__, ret);
318	goto out;
319	}
320
321	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
322	if (ret < 0)
323	goto out;
324
325	if (alrm->enabled)
326	ret = max77802_rtc_start_alarm(info);
327	out:
328	mutex_unlock(&info->lock);
329	return ret;
330	}
331
332	static int max77802_rtc_alarm_irq_enable(struct device *dev,
333	unsigned int enabled)
334	{
335	struct max77802_rtc_info *info = dev_get_drvdata(dev);
336	int ret;
337
338	mutex_lock(&info->lock);
339	if (enabled)
340	ret = max77802_rtc_start_alarm(info);
341	else
342	ret = max77802_rtc_stop_alarm(info);
343	mutex_unlock(&info->lock);
344
345	return ret;
346	}
347
348	static irqreturn_t max77802_rtc_alarm_irq(int irq, void *data)
349	{
350	struct max77802_rtc_info *info = data;
351
352	dev_dbg(info->dev, "%s:irq(%d)\n", __func__, irq);
353
354	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF \| RTC_AF);
355
356	return IRQ_HANDLED;
357	}
358
359	static const struct rtc_class_ops max77802_rtc_ops = {
360	.read_time = max77802_rtc_read_time,
361	.set_time = max77802_rtc_set_time,
362	.read_alarm = max77802_rtc_read_alarm,
363	.set_alarm = max77802_rtc_set_alarm,
364	.alarm_irq_enable = max77802_rtc_alarm_irq_enable,
365	};
366
367	static int max77802_rtc_init_reg(struct max77802_rtc_info *info)
368	{
369	u8 data[2];
370	int ret;
371
372	max77802_rtc_update(info, MAX77802_RTC_READ);
373
374	/* Set RTC control register : Binary mode, 24hour mdoe */
375	data[0] = (1 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
376	data[1] = (0 << BCD_EN_SHIFT) \| (1 << MODEL24_SHIFT);
377
378	info->rtc_24hr_mode = 1;
379
380	ret = regmap_bulk_write(info->max77802->regmap,
381	MAX77802_RTC_CONTROLM, data, ARRAY_SIZE(data));
382	if (ret < 0) {
383	dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
384	__func__, ret);
385	return ret;
386	}
387
388	ret = max77802_rtc_update(info, MAX77802_RTC_WRITE);
389	return ret;
390	}
391
392	static int max77802_rtc_probe(struct platform_device *pdev)
393	{
394	struct max77686_dev *max77802 = dev_get_drvdata(pdev->dev.parent);
395	struct max77802_rtc_info *info;
396	int ret;
397
398	dev_dbg(&pdev->dev, "%s\n", __func__);
399
400	info = devm_kzalloc(&pdev->dev, sizeof(struct max77802_rtc_info),
401	GFP_KERNEL);
402	if (!info)
403	return -ENOMEM;
404
405	mutex_init(&info->lock);
406	info->dev = &pdev->dev;
407	info->max77802 = max77802;
408	info->rtc = max77802->i2c;
409
410	platform_set_drvdata(pdev, info);
411
412	ret = max77802_rtc_init_reg(info);
413
414	if (ret < 0) {
415	dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
416	return ret;
417	}
418
419	device_init_wakeup(&pdev->dev, 1);
420
421	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77802-rtc",
422	&max77802_rtc_ops, THIS_MODULE);
423
424	if (IS_ERR(info->rtc_dev)) {
425	ret = PTR_ERR(info->rtc_dev);
426	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
427	if (ret == 0)
428	ret = -EINVAL;
429	return ret;
430	}
431
432	if (!max77802->rtc_irq_data) {
433	dev_err(&pdev->dev, "No RTC regmap IRQ chip\n");
434	return -EINVAL;
435	}
436
437	info->virq = regmap_irq_get_virq(max77802->rtc_irq_data,
438	MAX77686_RTCIRQ_RTCA1);
439
440	if (info->virq <= 0) {
441	dev_err(&pdev->dev, "Failed to get virtual IRQ %d\n",
442	MAX77686_RTCIRQ_RTCA1);
443	return -EINVAL;
444	}
445
446	ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL,
447	max77802_rtc_alarm_irq, 0, "rtc-alarm1",
448	info);
449	if (ret < 0)
450	dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
451	info->virq, ret);
452
453	return ret;
454	}
455
456	#ifdef CONFIG_PM_SLEEP
457	static int max77802_rtc_suspend(struct device *dev)
458	{
459	if (device_may_wakeup(dev)) {
460	struct max77802_rtc_info *info = dev_get_drvdata(dev);
461
462	return enable_irq_wake(info->virq);
463	}
464
465	return 0;
466	}
467
468	static int max77802_rtc_resume(struct device *dev)
469	{
470	if (device_may_wakeup(dev)) {
471	struct max77802_rtc_info *info = dev_get_drvdata(dev);
472
473	return disable_irq_wake(info->virq);
474	}
475
476	return 0;
477	}
478	#endif
479
480	static SIMPLE_DEV_PM_OPS(max77802_rtc_pm_ops,
481	max77802_rtc_suspend, max77802_rtc_resume);
482
483	static const struct platform_device_id rtc_id[] = {
484	{ "max77802-rtc", 0 },
485	{},
486	};
9bde31df	487	MODULE_DEVICE_TABLE(platform, rtc_id);
a4d4121b JMC	488
	489	static struct platform_driver max77802_rtc_driver = {
	490	.driver = {
	491	.name = "max77802-rtc",
a4d4121b JMC	492	.pm = &max77802_rtc_pm_ops,
	493	},
	494	.probe = max77802_rtc_probe,
	495	.id_table = rtc_id,
	496	};
	497
	498	module_platform_driver(max77802_rtc_driver);
	499
	500	MODULE_DESCRIPTION("Maxim MAX77802 RTC driver");
	501	MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
	502	MODULE_LICENSE("GPL");