drivers/rtc/rtc-da9052.c - linux - Git at Google

 // 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];

 	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;

 			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_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");
	// 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];

	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;

	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_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");