// SPDX-License-Identifier: GPL-2.0-or-later/* * Real time clock driver for DA9055 * * 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/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;	rtc_tm->tm_sec = 0; 	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 0;} 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, true); 	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");