// SPDX-License-Identifier: GPL-2.0-or-later/* * Real time clock driver for DA9052 * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: Dajun Dajun Chen <dajun.chen@diasemi.com> */ #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]; 	alm_time = rtc_tm_to_time64(rtc_tm); 	if (rtc_tm->tm_sec > 0) {		alm_time += 60 - rtc_tm->tm_sec;		rtc_time64_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; 			return 0;		} 		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_allocate_device(&pdev->dev);	if (IS_ERR(rtc->rtc))		return PTR_ERR(rtc->rtc); 	rtc->rtc->ops = &da9052_rtc_ops;	rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;	rtc->rtc->range_max = RTC_TIMESTAMP_END_2063; 	ret = devm_rtc_register_device(rtc->rtc);	if (ret)		return ret; 	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");