[linux-2.6-block.git] / drivers / rtc / rtc-da9055.c

/*
 * Real time clock driver for DA9055
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: Dajun Dajun Chen <dajun.chen@diasemi.com>
 *
 * 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/module.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>

#include <linux/mfd/da9055/core.h>
#include <linux/mfd/da9055/reg.h>
#include <linux/mfd/da9055/pdata.h>

struct da9055_rtc {
	struct rtc_device *rtc;
	struct da9055 *da9055;
	int alarm_enable;
};

static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)
{
	int ret;
	if (enable) {
		ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
					DA9055_RTC_ALM_EN,
					DA9055_RTC_ALM_EN);
		if (ret != 0)
			dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",
				ret);
		rtc->alarm_enable = 1;
	} else {
		ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
					DA9055_RTC_ALM_EN, 0);
		if (ret != 0)
			dev_err(rtc->da9055->dev,
				"Failed to disable ALM: %d\n", ret);
		rtc->alarm_enable = 0;
	}
	return ret;
}

static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)
{
	struct da9055_rtc *rtc = data;

	da9055_rtc_enable_alarm(rtc, 0);
	rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);

	return IRQ_HANDLED;
}

static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
{
	int ret;
	uint8_t v[5];

	ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
	if (ret != 0) {
		dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
		return ret;
	}

	rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
	rtc_tm->tm_mon  = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
	rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
	rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
	rtc_tm->tm_min  = v[0] & DA9055_RTC_ALM_MIN;

	return rtc_valid_tm(rtc_tm);
}

static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
{
	int ret;
	uint8_t v[2];

	rtc_tm->tm_year -= 100;
	rtc_tm->tm_mon += 1;

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
				DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
	if (ret != 0) {
		dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);
		return ret;
	}

	v[0] = rtc_tm->tm_hour;
	v[1] = rtc_tm->tm_mday;

	ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
	if (ret < 0)
		return ret;

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
				DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);
	if (ret < 0)
		dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);

	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,
				DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);
	if (ret < 0)
		dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);

	return ret;
}

static int da9055_rtc_get_alarm_status(struct da9055 *da9055)
{
	int ret;

	ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);
	if (ret < 0) {
		dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);
		return ret;
	}
	ret &= DA9055_RTC_ALM_EN;
	return (ret > 0) ? 1 : 0;
}

static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
{
	struct da9055_rtc *rtc = dev_get_drvdata(dev);
	uint8_t v[6];
	int ret;

	ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);
	if (ret < 0)
		return ret;

	/*
	 * Registers are only valid when RTC_READ
	 * status bit is asserted
	 */
	if (!(ret & DA9055_RTC_READ))
		return -EBUSY;

	ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
	if (ret < 0) {
		dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",
			ret);
		return ret;
	}

	rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;
	rtc_tm->tm_mon  = (v[4] & DA9055_RTC_MONTH) - 1;
	rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;
	rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;
	rtc_tm->tm_min  = v[1] & DA9055_RTC_MIN;
	rtc_tm->tm_sec  = v[0] & DA9055_RTC_SEC;

	return rtc_valid_tm(rtc_tm);
}

static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct da9055_rtc *rtc;
	uint8_t v[6];

	rtc = dev_get_drvdata(dev);

	v[0] = tm->tm_sec;
	v[1] = tm->tm_min;
	v[2] = tm->tm_hour;
	v[3] = tm->tm_mday;
	v[4] = tm->tm_mon + 1;
	v[5] = tm->tm_year - 100;

	return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
}

static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	ret = da9055_read_alarm(rtc->da9055, tm);

	if (ret)
		return ret;

	alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);

	return 0;
}

static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	ret = da9055_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
		return ret;

	ret = da9055_set_alarm(rtc->da9055, tm);
	if (ret)
		return ret;

	ret = da9055_rtc_enable_alarm(rtc, 1);

	return ret;
}

static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct da9055_rtc *rtc = dev_get_drvdata(dev);

	return da9055_rtc_enable_alarm(rtc, enabled);
}

static const struct rtc_class_ops da9055_rtc_ops = {
	.read_time	= da9055_rtc_read_time,
	.set_time	= da9055_rtc_set_time,
	.read_alarm	= da9055_rtc_read_alarm,
	.set_alarm	= da9055_rtc_set_alarm,
	.alarm_irq_enable = da9055_rtc_alarm_irq_enable,
};

static int da9055_rtc_device_init(struct da9055 *da9055,
					struct da9055_pdata *pdata)
{
	int ret;

	/* Enable RTC and the internal Crystal */
	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
				DA9055_RTC_EN, DA9055_RTC_EN);
	if (ret < 0)
		return ret;
	ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,
				DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);
	if (ret < 0)
		return ret;

	/* Enable RTC in Power Down mode */
	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
				DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);
	if (ret < 0)
		return ret;

	/* Enable RTC in Reset mode */
	if (pdata && pdata->reset_enable) {
		ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
					DA9055_RTC_MODE_SD,
					DA9055_RTC_MODE_SD <<
					DA9055_RTC_MODE_SD_SHIFT);
		if (ret < 0)
			return ret;
	}

	/* Disable the RTC TICK ALM */
	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
				DA9055_RTC_TICK_WAKE_MASK, 0);
	if (ret < 0)
		return ret;

	return 0;
}

static int da9055_rtc_probe(struct platform_device *pdev)
{
	struct da9055_rtc *rtc;
	struct da9055_pdata *pdata = NULL;
	int ret, alm_irq;

	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	rtc->da9055 = dev_get_drvdata(pdev->dev.parent);
	pdata = dev_get_platdata(rtc->da9055->dev);
	platform_set_drvdata(pdev, rtc);

	ret = da9055_rtc_device_init(rtc->da9055, pdata);
	if (ret < 0)
		goto err_rtc;

	ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);
	if (ret < 0)
		goto err_rtc;

	if (ret & DA9055_RTC_ALM_EN)
		rtc->alarm_enable = 1;

	device_init_wakeup(&pdev->dev, 1);

	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
					&da9055_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rtc)) {
		ret = PTR_ERR(rtc->rtc);
		goto err_rtc;
	}

	alm_irq = platform_get_irq_byname(pdev, "ALM");
	if (alm_irq < 0)
		return alm_irq;

	ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
					da9055_rtc_alm_irq,
					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
					"ALM", rtc);
	if (ret != 0)
		dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);

err_rtc:
	return ret;

}

#ifdef CONFIG_PM
/* Turn off the alarm if it should not be a wake source. */
static int da9055_rtc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	if (!device_may_wakeup(&pdev->dev)) {
		/* Disable the ALM IRQ */
		ret = da9055_rtc_enable_alarm(rtc, 0);
		if (ret < 0)
			dev_err(&pdev->dev, "Failed to disable RTC ALM\n");
	}

	return 0;
}

/* Enable the alarm if it should be enabled (in case it was disabled to
 * prevent use as a wake source).
 */
static int da9055_rtc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	if (!device_may_wakeup(&pdev->dev)) {
		if (rtc->alarm_enable) {
			ret = da9055_rtc_enable_alarm(rtc, 1);
			if (ret < 0)
				dev_err(&pdev->dev,
					"Failed to restart RTC ALM\n");
		}
	}

	return 0;
}

/* Unconditionally disable the alarm */
static int da9055_rtc_freeze(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	int ret;

	ret = da9055_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
		dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");

	return 0;

}
#else
#define da9055_rtc_suspend NULL
#define da9055_rtc_resume NULL
#define da9055_rtc_freeze NULL
#endif

static const struct dev_pm_ops da9055_rtc_pm_ops = {
	.suspend = da9055_rtc_suspend,
	.resume = da9055_rtc_resume,

	.freeze = da9055_rtc_freeze,
	.thaw = da9055_rtc_resume,
	.restore = da9055_rtc_resume,

	.poweroff = da9055_rtc_suspend,
};

static struct platform_driver da9055_rtc_driver = {
	.probe  = da9055_rtc_probe,
	.driver = {
		.name   = "da9055-rtc",
		.pm = &da9055_rtc_pm_ops,
	},
};

module_platform_driver(da9055_rtc_driver);

MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9055-rtc");
Commit	Line	Data
6920d996 AJ	1	/*
	2	* Real time clock driver for DA9055
	3	*
	4	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	5	*
	6	* Author: Dajun Dajun Chen <dajun.chen@diasemi.com>
	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 as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/rtc.h>
	18
	19	#include <linux/mfd/da9055/core.h>
	20	#include <linux/mfd/da9055/reg.h>
	21	#include <linux/mfd/da9055/pdata.h>
	22
	23	struct da9055_rtc {
	24	struct rtc_device *rtc;
	25	struct da9055 *da9055;
	26	int alarm_enable;
	27	};
	28
	29	static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)
	30	{
	31	int ret;
	32	if (enable) {
	33	ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
	34	DA9055_RTC_ALM_EN,
	35	DA9055_RTC_ALM_EN);
	36	if (ret != 0)
	37	dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",
	38	ret);
	39	rtc->alarm_enable = 1;
	40	} else {
	41	ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
	42	DA9055_RTC_ALM_EN, 0);
	43	if (ret != 0)
	44	dev_err(rtc->da9055->dev,
	45	"Failed to disable ALM: %d\n", ret);
	46	rtc->alarm_enable = 0;
	47	}
	48	return ret;
	49	}
	50
	51	static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)
	52	{
	53	struct da9055_rtc *rtc = data;
	54
	55	da9055_rtc_enable_alarm(rtc, 0);
	56	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	57
	58	return IRQ_HANDLED;
	59	}
	60
	61	static int da9055_read_alarm(struct da9055 da9055, struct rtc_time rtc_tm)
	62	{
	63	int ret;
	64	uint8_t v[5];
65
66	ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
67	if (ret != 0) {
68	dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
69	return ret;
70	}
71
72	rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
73	rtc_tm->tm_mon = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
74	rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
75	rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
76	rtc_tm->tm_min = v[0] & DA9055_RTC_ALM_MIN;
77
78	return rtc_valid_tm(rtc_tm);
79	}
80
81	static int da9055_set_alarm(struct da9055 da9055, struct rtc_time rtc_tm)
82	{
83	int ret;
84	uint8_t v[2];
85
86	rtc_tm->tm_year -= 100;
87	rtc_tm->tm_mon += 1;
88
89	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
90	DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
91	if (ret != 0) {
92	dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);
93	return ret;
94	}
95
96	v[0] = rtc_tm->tm_hour;
97	v[1] = rtc_tm->tm_mday;
98
99	ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
100	if (ret < 0)
101	return ret;
102
103	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
104	DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);
105	if (ret < 0)
106	dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);
107
108	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,
109	DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);
110	if (ret < 0)
111	dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);
112
113	return ret;
114	}
115
116	static int da9055_rtc_get_alarm_status(struct da9055 *da9055)
117	{
118	int ret;
119
120	ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);
121	if (ret < 0) {
122	dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);
123	return ret;
124	}
125	ret &= DA9055_RTC_ALM_EN;
126	return (ret > 0) ? 1 : 0;
127	}
128
129	static int da9055_rtc_read_time(struct device dev, struct rtc_time rtc_tm)
130	{
131	struct da9055_rtc *rtc = dev_get_drvdata(dev);
132	uint8_t v[6];
133	int ret;
134
135	ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);
136	if (ret < 0)
137	return ret;
138
139	/*
140	* Registers are only valid when RTC_READ
141	* status bit is asserted
142	*/
143	if (!(ret & DA9055_RTC_READ))
144	return -EBUSY;
145
146	ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
147	if (ret < 0) {
148	dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",
149	ret);
150	return ret;
151	}
152
153	rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;
154	rtc_tm->tm_mon = (v[4] & DA9055_RTC_MONTH) - 1;
155	rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;
156	rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;
157	rtc_tm->tm_min = v[1] & DA9055_RTC_MIN;
158	rtc_tm->tm_sec = v[0] & DA9055_RTC_SEC;
159
160	return rtc_valid_tm(rtc_tm);
161	}
162
163	static int da9055_rtc_set_time(struct device dev, struct rtc_time tm)
164	{
165	struct da9055_rtc *rtc;
166	uint8_t v[6];
167
168	rtc = dev_get_drvdata(dev);
169
170	v[0] = tm->tm_sec;
171	v[1] = tm->tm_min;
172	v[2] = tm->tm_hour;
173	v[3] = tm->tm_mday;
174	v[4] = tm->tm_mon + 1;
175	v[5] = tm->tm_year - 100;
176
177	return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
178	}
179
180	static int da9055_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
181	{
182	int ret;
183	struct rtc_time *tm = &alrm->time;
184	struct da9055_rtc *rtc = dev_get_drvdata(dev);
185
186	ret = da9055_read_alarm(rtc->da9055, tm);
187
188	if (ret)
189	return ret;
190
191	alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);
192
193	return 0;
194	}
195
196	static int da9055_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
197	{
198	int ret;
199	struct rtc_time *tm = &alrm->time;
200	struct da9055_rtc *rtc = dev_get_drvdata(dev);
201
202	ret = da9055_rtc_enable_alarm(rtc, 0);
203	if (ret < 0)
204	return ret;
205
206	ret = da9055_set_alarm(rtc->da9055, tm);
207	if (ret)
208	return ret;
209
210	ret = da9055_rtc_enable_alarm(rtc, 1);
211
212	return ret;
213	}
214
215	static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
216	{
217	struct da9055_rtc *rtc = dev_get_drvdata(dev);
218
219	return da9055_rtc_enable_alarm(rtc, enabled);
220	}
221
222	static const struct rtc_class_ops da9055_rtc_ops = {
223	.read_time = da9055_rtc_read_time,
224	.set_time = da9055_rtc_set_time,
225	.read_alarm = da9055_rtc_read_alarm,
226	.set_alarm = da9055_rtc_set_alarm,
227	.alarm_irq_enable = da9055_rtc_alarm_irq_enable,
228	};
229
0a1af1d6	230	static int da9055_rtc_device_init(struct da9055 *da9055,
6920d996 AJ	231	struct da9055_pdata *pdata)
	232	{
	233	int ret;
	234
	235	/* Enable RTC and the internal Crystal */
	236	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
	237	DA9055_RTC_EN, DA9055_RTC_EN);
	238	if (ret < 0)
	239	return ret;
	240	ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,
	241	DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);
	242	if (ret < 0)
	243	return ret;
	244
	245	/* Enable RTC in Power Down mode */
	246	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
	247	DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);
	248	if (ret < 0)
	249	return ret;
	250
	251	/* Enable RTC in Reset mode */
	252	if (pdata && pdata->reset_enable) {
	253	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
	254	DA9055_RTC_MODE_SD,
	255	DA9055_RTC_MODE_SD <<
	256	DA9055_RTC_MODE_SD_SHIFT);
	257	if (ret < 0)
	258	return ret;
	259	}
	260
	261	/* Disable the RTC TICK ALM */
	262	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
	263	DA9055_RTC_TICK_WAKE_MASK, 0);
	264	if (ret < 0)
	265	return ret;
	266
	267	return 0;
	268	}
	269
	270	static int da9055_rtc_probe(struct platform_device *pdev)
	271	{
	272	struct da9055_rtc *rtc;
	273	struct da9055_pdata *pdata = NULL;
	274	int ret, alm_irq;
	275
	276	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);
	277	if (!rtc)
	278	return -ENOMEM;
	279
	280	rtc->da9055 = dev_get_drvdata(pdev->dev.parent);
d1fa2452	281	pdata = dev_get_platdata(rtc->da9055->dev);
6920d996 AJ	282	platform_set_drvdata(pdev, rtc);
	283
	284	ret = da9055_rtc_device_init(rtc->da9055, pdata);
	285	if (ret < 0)
	286	goto err_rtc;
	287
	288	ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);
	289	if (ret < 0)
	290	goto err_rtc;
	291
	292	if (ret & DA9055_RTC_ALM_EN)
	293	rtc->alarm_enable = 1;
	294
	295	device_init_wakeup(&pdev->dev, 1);
	296
8c32edb5	297	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
6920d996 AJ	298	&da9055_rtc_ops, THIS_MODULE);
	299	if (IS_ERR(rtc->rtc)) {
	300	ret = PTR_ERR(rtc->rtc);
	301	goto err_rtc;
	302	}
	303
	304	alm_irq = platform_get_irq_byname(pdev, "ALM");
dc9d8887 AT	305	if (alm_irq < 0)
	306	return alm_irq;
	307
6920d996 AJ	308	ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
	309	da9055_rtc_alm_irq,
	310	IRQF_TRIGGER_HIGH \| IRQF_ONESHOT,
	311	"ALM", rtc);
	312	if (ret != 0)
	313	dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);
	314
	315	err_rtc:
	316	return ret;
	317
	318	}
	319
6920d996 AJ	320	#ifdef CONFIG_PM
	321	/* Turn off the alarm if it should not be a wake source. */
	322	static int da9055_rtc_suspend(struct device *dev)
	323	{
	324	struct platform_device *pdev = to_platform_device(dev);
	325	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	326	int ret;
	327
	328	if (!device_may_wakeup(&pdev->dev)) {
	329	/* Disable the ALM IRQ */
	330	ret = da9055_rtc_enable_alarm(rtc, 0);
	331	if (ret < 0)
	332	dev_err(&pdev->dev, "Failed to disable RTC ALM\n");
	333	}
	334
	335	return 0;
	336	}
	337
	338	/* Enable the alarm if it should be enabled (in case it was disabled to
	339	* prevent use as a wake source).
	340	*/
	341	static int da9055_rtc_resume(struct device *dev)
	342	{
	343	struct platform_device *pdev = to_platform_device(dev);
	344	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	345	int ret;
	346
	347	if (!device_may_wakeup(&pdev->dev)) {
	348	if (rtc->alarm_enable) {
	349	ret = da9055_rtc_enable_alarm(rtc, 1);
	350	if (ret < 0)
	351	dev_err(&pdev->dev,
	352	"Failed to restart RTC ALM\n");
	353	}
	354	}
	355
	356	return 0;
	357	}
	358
	359	/* Unconditionally disable the alarm */
	360	static int da9055_rtc_freeze(struct device *dev)
	361	{
	362	struct platform_device *pdev = to_platform_device(dev);
	363	struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
	364	int ret;
	365
	366	ret = da9055_rtc_enable_alarm(rtc, 0);
	367	if (ret < 0)
	368	dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");
	369
	370	return 0;
	371
	372	}
	373	#else
	374	#define da9055_rtc_suspend NULL
	375	#define da9055_rtc_resume NULL
	376	#define da9055_rtc_freeze NULL
	377	#endif
	378
	379	static const struct dev_pm_ops da9055_rtc_pm_ops = {
	380	.suspend = da9055_rtc_suspend,
	381	.resume = da9055_rtc_resume,
	382
	383	.freeze = da9055_rtc_freeze,
384	.thaw = da9055_rtc_resume,
385	.restore = da9055_rtc_resume,
386
387	.poweroff = da9055_rtc_suspend,
388	};
389
390	static struct platform_driver da9055_rtc_driver = {
391	.probe = da9055_rtc_probe,
6920d996 AJ	392	.driver = {
6920d996 AJ	393	.name = "da9055-rtc",
6920d996 AJ	394	.pm = &da9055_rtc_pm_ops,
	395	},
	396	};
	397
	398	module_platform_driver(da9055_rtc_driver);
	399
	400	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	401	MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");
	402	MODULE_LICENSE("GPL");
	403	MODULE_ALIAS("platform:da9055-rtc");