// SPDX-License-Identifier: GPL-2.0-only/* * RTC driver for Maxim MAX8925 * * Copyright (C) 2009-2010 Marvell International Ltd. *	Haojian Zhuang <haojian.zhuang@marvell.com> */ #include <linux/module.h>#include <linux/i2c.h>#include <linux/slab.h>#include <linux/rtc.h>#include <linux/platform_device.h>#include <linux/mfd/max8925.h> enum {	RTC_SEC = 0,	RTC_MIN,	RTC_HOUR,	RTC_WEEKDAY,	RTC_DATE,	RTC_MONTH,	RTC_YEAR1,	RTC_YEAR2,}; #define MAX8925_RTC_SEC			0x00#define MAX8925_RTC_MIN			0x01#define MAX8925_RTC_HOUR		0x02#define MAX8925_RTC_WEEKDAY		0x03#define MAX8925_RTC_DATE		0x04#define MAX8925_RTC_MONTH		0x05#define MAX8925_RTC_YEAR1		0x06#define MAX8925_RTC_YEAR2		0x07#define MAX8925_ALARM0_SEC		0x08#define MAX8925_ALARM0_MIN		0x09#define MAX8925_ALARM0_HOUR		0x0a#define MAX8925_ALARM0_WEEKDAY		0x0b#define MAX8925_ALARM0_DATE		0x0c#define MAX8925_ALARM0_MON		0x0d#define MAX8925_ALARM0_YEAR1		0x0e#define MAX8925_ALARM0_YEAR2		0x0f#define MAX8925_ALARM1_SEC		0x10#define MAX8925_ALARM1_MIN		0x11#define MAX8925_ALARM1_HOUR		0x12#define MAX8925_ALARM1_WEEKDAY		0x13#define MAX8925_ALARM1_DATE		0x14#define MAX8925_ALARM1_MON		0x15#define MAX8925_ALARM1_YEAR1		0x16#define MAX8925_ALARM1_YEAR2		0x17#define MAX8925_RTC_CNTL		0x1b#define MAX8925_RTC_STATUS		0x20 #define TIME_NUM			8#define ALARM_1SEC			(1 << 7)#define HOUR_12				(1 << 7)#define HOUR_AM_PM			(1 << 5)#define ALARM0_IRQ			(1 << 3)#define ALARM1_IRQ			(1 << 2)#define ALARM0_STATUS			(1 << 2)#define ALARM1_STATUS			(1 << 1)  struct max8925_rtc_info {	struct rtc_device	*rtc_dev;	struct max8925_chip	*chip;	struct i2c_client	*rtc;	struct device		*dev;	int			irq;}; static irqreturn_t rtc_update_handler(int irq, void *data){	struct max8925_rtc_info *info = (struct max8925_rtc_info *)data; 	/* disable ALARM0 except for 1SEC alarm */	max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0);	rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);	return IRQ_HANDLED;} static int tm_calc(struct rtc_time *tm, unsigned char *buf, int len){	if (len < TIME_NUM)		return -EINVAL;	tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000			+ (buf[RTC_YEAR2] & 0xf) * 100			+ (buf[RTC_YEAR1] >> 4) * 10			+ (buf[RTC_YEAR1] & 0xf);	tm->tm_year -= 1900;	tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10			+ (buf[RTC_MONTH] & 0x0f);	tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10			+ (buf[RTC_DATE] & 0x0f);	tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;	if (buf[RTC_HOUR] & HOUR_12) {		tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10				+ (buf[RTC_HOUR] & 0x0f);		if (buf[RTC_HOUR] & HOUR_AM_PM)			tm->tm_hour += 12;	} else		tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10				+ (buf[RTC_HOUR] & 0x0f);	tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10			+ (buf[RTC_MIN] & 0x0f);	tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10			+ (buf[RTC_SEC] & 0x0f);	return 0;} static int data_calc(unsigned char *buf, struct rtc_time *tm, int len){	unsigned char high, low; 	if (len < TIME_NUM)		return -EINVAL; 	high = (tm->tm_year + 1900) / 1000;	low = (tm->tm_year + 1900) / 100;	low = low - high * 10;	buf[RTC_YEAR2] = (high << 4) + low;	high = (tm->tm_year + 1900) / 10;	low = tm->tm_year + 1900;	low = low - high * 10;	high = high - (high / 10) * 10;	buf[RTC_YEAR1] = (high << 4) + low;	high = tm->tm_mon / 10;	low = tm->tm_mon;	low = low - high * 10;	buf[RTC_MONTH] = (high << 4) + low;	high = tm->tm_mday / 10;	low = tm->tm_mday;	low = low - high * 10;	buf[RTC_DATE] = (high << 4) + low;	buf[RTC_WEEKDAY] = tm->tm_wday;	high = tm->tm_hour / 10;	low = tm->tm_hour;	low = low - high * 10;	buf[RTC_HOUR] = (high << 4) + low;	high = tm->tm_min / 10;	low = tm->tm_min;	low = low - high * 10;	buf[RTC_MIN] = (high << 4) + low;	high = tm->tm_sec / 10;	low = tm->tm_sec;	low = low - high * 10;	buf[RTC_SEC] = (high << 4) + low;	return 0;} static int max8925_rtc_read_time(struct device *dev, struct rtc_time *tm){	struct max8925_rtc_info *info = dev_get_drvdata(dev);	unsigned char buf[TIME_NUM];	int ret; 	ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);	if (ret < 0)		goto out;	ret = tm_calc(tm, buf, TIME_NUM);out:	return ret;} static int max8925_rtc_set_time(struct device *dev, struct rtc_time *tm){	struct max8925_rtc_info *info = dev_get_drvdata(dev);	unsigned char buf[TIME_NUM];	int ret; 	ret = data_calc(buf, tm, TIME_NUM);	if (ret < 0)		goto out;	ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);out:	return ret;} static int max8925_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm){	struct max8925_rtc_info *info = dev_get_drvdata(dev);	unsigned char buf[TIME_NUM];	int ret; 	ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);	if (ret < 0)		goto out;	ret = tm_calc(&alrm->time, buf, TIME_NUM);	if (ret < 0)		goto out;	ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK);	if (ret < 0)		goto out;	if (ret & ALARM0_IRQ) {		alrm->enabled = 0;	} else {		ret = max8925_reg_read(info->rtc, MAX8925_ALARM0_CNTL);		if (ret < 0)			goto out;		if (!ret)			alrm->enabled = 0;		else			alrm->enabled = 1;	}	ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);	if (ret < 0)		goto out;	if (ret & ALARM0_STATUS)		alrm->pending = 1;	else		alrm->pending = 0;	return 0;out:	return ret;} static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm){	struct max8925_rtc_info *info = dev_get_drvdata(dev);	unsigned char buf[TIME_NUM];	int ret; 	ret = data_calc(buf, &alrm->time, TIME_NUM);	if (ret < 0)		goto out;	ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);	if (ret < 0)		goto out;	if (alrm->enabled)		/* only enable alarm on year/month/day/hour/min/sec */		ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);	else		ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x0);out:	return ret;} static const struct rtc_class_ops max8925_rtc_ops = {	.read_time	= max8925_rtc_read_time,	.set_time	= max8925_rtc_set_time,	.read_alarm	= max8925_rtc_read_alarm,	.set_alarm	= max8925_rtc_set_alarm,}; static int max8925_rtc_probe(struct platform_device *pdev){	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);	struct max8925_rtc_info *info;	int ret; 	info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_rtc_info),			    GFP_KERNEL);	if (!info)		return -ENOMEM;	info->chip = chip;	info->rtc = chip->rtc;	info->dev = &pdev->dev;	info->irq = platform_get_irq(pdev, 0); 	ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,					rtc_update_handler, IRQF_ONESHOT,					"rtc-alarm0", info);	if (ret < 0) {		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",			info->irq, ret);		return ret;	} 	dev_set_drvdata(&pdev->dev, info);	/* XXX - isn't this redundant? */	platform_set_drvdata(pdev, info); 	device_init_wakeup(&pdev->dev, true); 	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8925-rtc",					&max8925_rtc_ops, THIS_MODULE);	ret = PTR_ERR(info->rtc_dev);	if (IS_ERR(info->rtc_dev)) {		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);		return ret;	} 	return 0;} #ifdef CONFIG_PM_SLEEPstatic int max8925_rtc_suspend(struct device *dev){	struct platform_device *pdev = to_platform_device(dev);	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 	if (device_may_wakeup(dev))		chip->wakeup_flag |= 1 << MAX8925_IRQ_RTC_ALARM0;	return 0;}static int max8925_rtc_resume(struct device *dev){	struct platform_device *pdev = to_platform_device(dev);	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 	if (device_may_wakeup(dev))		chip->wakeup_flag &= ~(1 << MAX8925_IRQ_RTC_ALARM0);	return 0;}#endif static SIMPLE_DEV_PM_OPS(max8925_rtc_pm_ops, max8925_rtc_suspend, max8925_rtc_resume); static struct platform_driver max8925_rtc_driver = {	.driver		= {		.name	= "max8925-rtc",		.pm     = &max8925_rtc_pm_ops,	},	.probe		= max8925_rtc_probe,}; module_platform_driver(max8925_rtc_driver); MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");MODULE_LICENSE("GPL");