[mirror_ubuntu-bionic-kernel.git] / drivers / rtc / rtc-da9052.c

/*
 * Real time clock driver for DA9052
 *
 * 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/err.h>
#include <linux/delay.h>

#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>

#define rtc_err(rtc, fmt, ...) \
		dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)

#define DA9052_GET_TIME_RETRIES 5

struct da9052_rtc {
	struct rtc_device *rtc;
	struct da9052 *da9052;
};

static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)
{
	int ret;
	if (enable) {
		ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
				DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON,
				DA9052_ALARM_Y_ALARM_ON);
		if (ret != 0)
			rtc_err(rtc, "Failed to enable ALM: %d\n", ret);
	} else {
		ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
			DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0);
		if (ret != 0)
			rtc_err(rtc, "Write error: %d\n", ret);
	}
	return ret;
}

static irqreturn_t da9052_rtc_irq(int irq, void *data)
{
	struct da9052_rtc *rtc = data;

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

	return IRQ_HANDLED;
}

static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
{
	int ret;
	uint8_t v[2][5];
	int idx = 1;
	int timeout = DA9052_GET_TIME_RETRIES;

	ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, &v[0][0]);
	if (ret) {
		rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
		return ret;
	}

	do {
		ret = da9052_group_read(rtc->da9052,
					DA9052_ALARM_MI_REG, 5, &v[idx][0]);
		if (ret) {
			rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
			return ret;
		}

		if (memcmp(&v[0][0], &v[1][0], 5) == 0) {
			rtc_tm->tm_year = (v[0][4] & DA9052_RTC_YEAR) + 100;
			rtc_tm->tm_mon  = (v[0][3] & DA9052_RTC_MONTH) - 1;
			rtc_tm->tm_mday = v[0][2] & DA9052_RTC_DAY;
			rtc_tm->tm_hour = v[0][1] & DA9052_RTC_HOUR;
			rtc_tm->tm_min  = v[0][0] & DA9052_RTC_MIN;
			rtc_tm->tm_sec = 0;

			ret = rtc_valid_tm(rtc_tm);
			return ret;
		}

		idx = (1-idx);
		msleep(20);

	} while (timeout--);

	rtc_err(rtc, "Timed out reading alarm time\n");

	return -EIO;
}

static int da9052_set_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
{
	struct da9052 *da9052 = rtc->da9052;
	unsigned long alm_time;
	int ret;
	uint8_t v[3];

	ret = rtc_tm_to_time(rtc_tm, &alm_time);
	if (ret != 0)
		return ret;

	if (rtc_tm->tm_sec > 0) {
		alm_time += 60 - rtc_tm->tm_sec;
		rtc_time_to_tm(alm_time, rtc_tm);
	}
	BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */

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

	ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
				DA9052_RTC_MIN, rtc_tm->tm_min);
	if (ret != 0) {
		rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret);
		return ret;
	}

	v[0] = rtc_tm->tm_hour;
	v[1] = rtc_tm->tm_mday;
	v[2] = rtc_tm->tm_mon;

	ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
	if (ret < 0)
		return ret;

	ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
				DA9052_RTC_YEAR, rtc_tm->tm_year);
	if (ret != 0)
		rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret);

	return ret;
}

static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc)
{
	int ret;

	ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG);
	if (ret < 0) {
		rtc_err(rtc, "Failed to read ALM: %d\n", ret);
		return ret;
	}

	return !!(ret&DA9052_ALARM_Y_ALARM_ON);
}

static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
{
	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	int ret;
	uint8_t v[2][6];
	int idx = 1;
	int timeout = DA9052_GET_TIME_RETRIES;

	ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, &v[0][0]);
	if (ret) {
		rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
		return ret;
	}

	do {
		ret = da9052_group_read(rtc->da9052,
					DA9052_COUNT_S_REG, 6, &v[idx][0]);
		if (ret) {
			rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
			return ret;
		}

		if (memcmp(&v[0][0], &v[1][0], 6) == 0) {
			rtc_tm->tm_year = (v[0][5] & DA9052_RTC_YEAR) + 100;
			rtc_tm->tm_mon  = (v[0][4] & DA9052_RTC_MONTH) - 1;
			rtc_tm->tm_mday = v[0][3] & DA9052_RTC_DAY;
			rtc_tm->tm_hour = v[0][2] & DA9052_RTC_HOUR;
			rtc_tm->tm_min  = v[0][1] & DA9052_RTC_MIN;
			rtc_tm->tm_sec  = v[0][0] & DA9052_RTC_SEC;

			ret = rtc_valid_tm(rtc_tm);
			return ret;
		}

		idx = (1-idx);
		msleep(20);

	} while (timeout--);

	rtc_err(rtc, "Timed out reading time\n");

	return -EIO;
}

static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct da9052_rtc *rtc;
	uint8_t v[6];
	int ret;

	/* DA9052 only has 6 bits for year - to represent 2000-2063 */
	if ((tm->tm_year < 100) || (tm->tm_year > 163))
		return -EINVAL;

	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;

	ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
	if (ret < 0)
		rtc_err(rtc, "failed to set RTC time: %d\n", ret);
	return ret;
}

static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9052_rtc *rtc = dev_get_drvdata(dev);

	ret = da9052_read_alarm(rtc, tm);
	if (ret < 0) {
		rtc_err(rtc, "failed to read RTC alarm: %d\n", ret);
		return ret;
	}

	alrm->enabled = da9052_rtc_get_alarm_status(rtc);
	return 0;
}

static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;
	struct rtc_time *tm = &alrm->time;
	struct da9052_rtc *rtc = dev_get_drvdata(dev);

	/* DA9052 only has 6 bits for year - to represent 2000-2063 */
	if ((tm->tm_year < 100) || (tm->tm_year > 163))
		return -EINVAL;

	ret = da9052_rtc_enable_alarm(rtc, 0);
	if (ret < 0)
		return ret;

	ret = da9052_set_alarm(rtc, tm);
	if (ret < 0)
		return ret;

	ret = da9052_rtc_enable_alarm(rtc, 1);
	return ret;
}

static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct da9052_rtc *rtc = dev_get_drvdata(dev);

	return da9052_rtc_enable_alarm(rtc, enabled);
}

static const struct rtc_class_ops da9052_rtc_ops = {
	.read_time	= da9052_rtc_read_time,
	.set_time	= da9052_rtc_set_time,
	.read_alarm	= da9052_rtc_read_alarm,
	.set_alarm	= da9052_rtc_set_alarm,
	.alarm_irq_enable = da9052_rtc_alarm_irq_enable,
};

static int da9052_rtc_probe(struct platform_device *pdev)
{
	struct da9052_rtc *rtc;
	int ret;

	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
	platform_set_drvdata(pdev, rtc);

	ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE);
	if (ret < 0) {
		rtc_err(rtc,
			"Failed to setup RTC battery charging: %d\n", ret);
		return ret;
	}

	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
				DA9052_ALARM_Y_TICK_ON, 0);
	if (ret != 0)
		rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);

	device_init_wakeup(&pdev->dev, true);
	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
				       &da9052_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc->rtc))
		return PTR_ERR(rtc->rtc);

	ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
				da9052_rtc_irq, rtc);
	if (ret != 0) {
		rtc_err(rtc, "irq registration failed: %d\n", ret);
		return ret;
	}

	return 0;
}

static struct platform_driver da9052_rtc_driver = {
	.probe	= da9052_rtc_probe,
	.driver = {
		.name	= "da9052-rtc",
	},
};

module_platform_driver(da9052_rtc_driver);

MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-rtc");
Commit	Line	Data
fef931ff AJ	1	/*
	2	* Real time clock driver for DA9052
	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>
11f54d05	18	#include <linux/err.h>
03cc1625	19	#include <linux/delay.h>
fef931ff AJ	20
	21	#include <linux/mfd/da9052/da9052.h>
	22	#include <linux/mfd/da9052/reg.h>
	23
7c994c08 AO	24	#define rtc_err(rtc, fmt, ...) \
7c994c08 AO	25	dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)
fef931ff	26
03cc1625 AW	27	#define DA9052_GET_TIME_RETRIES 5
03cc1625 AW	28
fef931ff AJ	29	struct da9052_rtc {
	30	struct rtc_device *rtc;
	31	struct da9052 *da9052;
fef931ff AJ	32	};
fef931ff AJ	33
7c994c08	34	static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)
fef931ff AJ	35	{
	36	int ret;
	37	if (enable) {
7c994c08 AO	38	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
	39	DA9052_ALARM_Y_ALARM_ON\|DA9052_ALARM_Y_TICK_ON,
	40	DA9052_ALARM_Y_ALARM_ON);
fef931ff	41	if (ret != 0)
7c994c08	42	rtc_err(rtc, "Failed to enable ALM: %d\n", ret);
fef931ff	43	} else {
7c994c08 AO	44	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
7c994c08 AO	45	DA9052_ALARM_Y_ALARM_ON\|DA9052_ALARM_Y_TICK_ON, 0);
fef931ff	46	if (ret != 0)
7c994c08	47	rtc_err(rtc, "Write error: %d\n", ret);
fef931ff AJ	48	}
	49	return ret;
	50	}
	51
	52	static irqreturn_t da9052_rtc_irq(int irq, void *data)
	53	{
	54	struct da9052_rtc *rtc = data;
fef931ff	55
7c994c08	56	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
fef931ff AJ	57
	58	return IRQ_HANDLED;
	59	}
	60
7c994c08	61	static int da9052_read_alarm(struct da9052_rtc rtc, struct rtc_time rtc_tm)
fef931ff AJ	62	{
fef931ff AJ	63	int ret;
03cc1625 AW	64	uint8_t v[2][5];
	65	int idx = 1;
	66	int timeout = DA9052_GET_TIME_RETRIES;
fef931ff	67
03cc1625 AW	68	ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, &v[0][0]);
03cc1625 AW	69	if (ret) {
7c994c08	70	rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
fef931ff AJ	71	return ret;
	72	}
	73
03cc1625 AW	74	do {
	75	ret = da9052_group_read(rtc->da9052,
	76	DA9052_ALARM_MI_REG, 5, &v[idx][0]);
	77	if (ret) {
	78	rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
	79	return ret;
	80	}
fef931ff	81
03cc1625 AW	82	if (memcmp(&v[0][0], &v[1][0], 5) == 0) {
	83	rtc_tm->tm_year = (v[0][4] & DA9052_RTC_YEAR) + 100;
	84	rtc_tm->tm_mon = (v[0][3] & DA9052_RTC_MONTH) - 1;
	85	rtc_tm->tm_mday = v[0][2] & DA9052_RTC_DAY;
	86	rtc_tm->tm_hour = v[0][1] & DA9052_RTC_HOUR;
	87	rtc_tm->tm_min = v[0][0] & DA9052_RTC_MIN;
d2c92705	88	rtc_tm->tm_sec = 0;
03cc1625 AW	89
	90	ret = rtc_valid_tm(rtc_tm);
	91	return ret;
	92	}
	93
	94	idx = (1-idx);
	95	msleep(20);
	96
	97	} while (timeout--);
	98
	99	rtc_err(rtc, "Timed out reading alarm time\n");
	100
	101	return -EIO;
fef931ff AJ	102	}
fef931ff AJ	103
7c994c08	104	static int da9052_set_alarm(struct da9052_rtc rtc, struct rtc_time rtc_tm)
fef931ff	105	{
7c994c08 AO	106	struct da9052 *da9052 = rtc->da9052;
7c994c08 AO	107	unsigned long alm_time;
fef931ff AJ	108	int ret;
	109	uint8_t v[3];
	110
7c994c08 AO	111	ret = rtc_tm_to_time(rtc_tm, &alm_time);
	112	if (ret != 0)
	113	return ret;
	114
	115	if (rtc_tm->tm_sec > 0) {
	116	alm_time += 60 - rtc_tm->tm_sec;
	117	rtc_time_to_tm(alm_time, rtc_tm);
	118	}
	119	BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */
	120
fef931ff AJ	121	rtc_tm->tm_year -= 100;
	122	rtc_tm->tm_mon += 1;
	123
	124	ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
	125	DA9052_RTC_MIN, rtc_tm->tm_min);
	126	if (ret != 0) {
7c994c08	127	rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret);
fef931ff AJ	128	return ret;
	129	}
	130
	131	v[0] = rtc_tm->tm_hour;
	132	v[1] = rtc_tm->tm_mday;
	133	v[2] = rtc_tm->tm_mon;
	134
	135	ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
	136	if (ret < 0)
	137	return ret;
	138
	139	ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
	140	DA9052_RTC_YEAR, rtc_tm->tm_year);
	141	if (ret != 0)
7c994c08	142	rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret);
fef931ff AJ	143
	144	return ret;
	145	}
	146
7c994c08	147	static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc)
fef931ff AJ	148	{
	149	int ret;
	150
7c994c08	151	ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG);
fef931ff	152	if (ret < 0) {
7c994c08	153	rtc_err(rtc, "Failed to read ALM: %d\n", ret);
fef931ff AJ	154	return ret;
fef931ff AJ	155	}
7c994c08 AO	156
7c994c08 AO	157	return !!(ret&DA9052_ALARM_Y_ALARM_ON);
fef931ff AJ	158	}
	159
	160	static int da9052_rtc_read_time(struct device dev, struct rtc_time rtc_tm)
	161	{
	162	struct da9052_rtc *rtc = dev_get_drvdata(dev);
fef931ff	163	int ret;
03cc1625 AW	164	uint8_t v[2][6];
	165	int idx = 1;
	166	int timeout = DA9052_GET_TIME_RETRIES;
fef931ff	167
03cc1625 AW	168	ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, &v[0][0]);
03cc1625 AW	169	if (ret) {
7c994c08	170	rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
fef931ff AJ	171	return ret;
	172	}
	173
03cc1625 AW	174	do {
	175	ret = da9052_group_read(rtc->da9052,
	176	DA9052_COUNT_S_REG, 6, &v[idx][0]);
	177	if (ret) {
	178	rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
	179	return ret;
	180	}
fef931ff	181
03cc1625 AW	182	if (memcmp(&v[0][0], &v[1][0], 6) == 0) {
	183	rtc_tm->tm_year = (v[0][5] & DA9052_RTC_YEAR) + 100;
	184	rtc_tm->tm_mon = (v[0][4] & DA9052_RTC_MONTH) - 1;
	185	rtc_tm->tm_mday = v[0][3] & DA9052_RTC_DAY;
	186	rtc_tm->tm_hour = v[0][2] & DA9052_RTC_HOUR;
	187	rtc_tm->tm_min = v[0][1] & DA9052_RTC_MIN;
	188	rtc_tm->tm_sec = v[0][0] & DA9052_RTC_SEC;
	189
	190	ret = rtc_valid_tm(rtc_tm);
	191	return ret;
	192	}
	193
	194	idx = (1-idx);
	195	msleep(20);
	196
	197	} while (timeout--);
	198
	199	rtc_err(rtc, "Timed out reading time\n");
	200
	201	return -EIO;
fef931ff AJ	202	}
	203
	204	static int da9052_rtc_set_time(struct device dev, struct rtc_time tm)
	205	{
	206	struct da9052_rtc *rtc;
	207	uint8_t v[6];
7c994c08	208	int ret;
fef931ff	209
ae824c48 AW	210	/* DA9052 only has 6 bits for year - to represent 2000-2063 */
	211	if ((tm->tm_year < 100) \|\| (tm->tm_year > 163))
	212	return -EINVAL;
	213
fef931ff AJ	214	rtc = dev_get_drvdata(dev);
	215
	216	v[0] = tm->tm_sec;
	217	v[1] = tm->tm_min;
	218	v[2] = tm->tm_hour;
	219	v[3] = tm->tm_mday;
	220	v[4] = tm->tm_mon + 1;
	221	v[5] = tm->tm_year - 100;
	222
7c994c08 AO	223	ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
	224	if (ret < 0)
	225	rtc_err(rtc, "failed to set RTC time: %d\n", ret);
	226	return ret;
fef931ff AJ	227	}
	228
	229	static int da9052_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	230	{
	231	int ret;
	232	struct rtc_time *tm = &alrm->time;
	233	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	234
7c994c08 AO	235	ret = da9052_read_alarm(rtc, tm);
	236	if (ret < 0) {
	237	rtc_err(rtc, "failed to read RTC alarm: %d\n", ret);
fef931ff	238	return ret;
7c994c08	239	}
fef931ff	240
7c994c08	241	alrm->enabled = da9052_rtc_get_alarm_status(rtc);
fef931ff AJ	242	return 0;
	243	}
	244
	245	static int da9052_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	246	{
	247	int ret;
	248	struct rtc_time *tm = &alrm->time;
	249	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	250
ae824c48 AW	251	/* DA9052 only has 6 bits for year - to represent 2000-2063 */
	252	if ((tm->tm_year < 100) \|\| (tm->tm_year > 163))
	253	return -EINVAL;
	254
7c994c08	255	ret = da9052_rtc_enable_alarm(rtc, 0);
fef931ff AJ	256	if (ret < 0)
	257	return ret;
	258
7c994c08 AO	259	ret = da9052_set_alarm(rtc, tm);
7c994c08 AO	260	if (ret < 0)
fef931ff AJ	261	return ret;
fef931ff AJ	262
7c994c08	263	ret = da9052_rtc_enable_alarm(rtc, 1);
fef931ff AJ	264	return ret;
	265	}
	266
	267	static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	268	{
	269	struct da9052_rtc *rtc = dev_get_drvdata(dev);
	270
7c994c08	271	return da9052_rtc_enable_alarm(rtc, enabled);
fef931ff AJ	272	}
	273
	274	static const struct rtc_class_ops da9052_rtc_ops = {
	275	.read_time = da9052_rtc_read_time,
	276	.set_time = da9052_rtc_set_time,
	277	.read_alarm = da9052_rtc_read_alarm,
	278	.set_alarm = da9052_rtc_set_alarm,
	279	.alarm_irq_enable = da9052_rtc_alarm_irq_enable,
	280	};
	281
5a167f45	282	static int da9052_rtc_probe(struct platform_device *pdev)
fef931ff AJ	283	{
	284	struct da9052_rtc *rtc;
	285	int ret;
	286
	287	rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
	288	if (!rtc)
	289	return -ENOMEM;
	290
	291	rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
	292	platform_set_drvdata(pdev, rtc);
7c994c08 AO	293
	294	ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE);
	295	if (ret < 0) {
	296	rtc_err(rtc,
	297	"Failed to setup RTC battery charging: %d\n", ret);
	298	return ret;
	299	}
	300
	301	ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
	302	DA9052_ALARM_Y_TICK_ON, 0);
	303	if (ret != 0)
	304	rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);
	305
6406d96e ST	306	device_init_wakeup(&pdev->dev, true);
	307	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
	308	&da9052_rtc_ops, THIS_MODULE);
	309
	310	if (IS_ERR(rtc->rtc))
	311	return PTR_ERR(rtc->rtc);
	312
c2c0eed7	313	ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
925e8ea6	314	da9052_rtc_irq, rtc);
fef931ff	315	if (ret != 0) {
7c994c08	316	rtc_err(rtc, "irq registration failed: %d\n", ret);
007def04	317	return ret;
fef931ff AJ	318	}
fef931ff AJ	319
6406d96e	320	return 0;
fef931ff AJ	321	}
fef931ff AJ	322
fef931ff AJ	323	static struct platform_driver da9052_rtc_driver = {
fef931ff AJ	324	.probe = da9052_rtc_probe,
fef931ff AJ	325	.driver = {
fef931ff AJ	326	.name = "da9052-rtc",
fef931ff AJ	327	},
	328	};
	329
	330	module_platform_driver(da9052_rtc_driver);
	331
7c994c08	332	MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
fef931ff AJ	333	MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
	334	MODULE_LICENSE("GPL");
	335	MODULE_ALIAS("platform:da9052-rtc");