// SPDX-License-Identifier: GPL-2.0-only/* * RTC driver for Maxim MAX8907 * * Copyright (c) 2011-2012, NVIDIA Corporation. * * Based on drivers/rtc/rtc-max8925.c, * Copyright (C) 2009-2010 Marvell International Ltd. */ #include <linux/bcd.h>#include <linux/mfd/max8907.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/regmap.h>#include <linux/rtc.h>#include <linux/slab.h> enum {	RTC_SEC = 0,	RTC_MIN,	RTC_HOUR,	RTC_WEEKDAY,	RTC_DATE,	RTC_MONTH,	RTC_YEAR1,	RTC_YEAR2,}; #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 max8907_rtc {	struct max8907		*max8907;	struct regmap		*regmap;	struct rtc_device	*rtc_dev;	int			irq;}; static irqreturn_t max8907_irq_handler(int irq, void *data){	struct max8907_rtc *rtc = data; 	regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0); 	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); 	return IRQ_HANDLED;} static void regs_to_tm(u8 *regs, struct rtc_time *tm){	tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 +		bcd2bin(regs[RTC_YEAR1]) - 1900;	tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1;	tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f);	tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07);	if (regs[RTC_HOUR] & HOUR_12) {		tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f);		if (tm->tm_hour == 12)			tm->tm_hour = 0;		if (regs[RTC_HOUR] & HOUR_AM_PM)			tm->tm_hour += 12;	} else {		tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f);	}	tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f);	tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f);} static void tm_to_regs(struct rtc_time *tm, u8 *regs){	u8 high, low; 	high = (tm->tm_year + 1900) / 100;	low = tm->tm_year % 100;	regs[RTC_YEAR2] = bin2bcd(high);	regs[RTC_YEAR1] = bin2bcd(low);	regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1);	regs[RTC_DATE] = bin2bcd(tm->tm_mday);	regs[RTC_WEEKDAY] = tm->tm_wday;	regs[RTC_HOUR] = bin2bcd(tm->tm_hour);	regs[RTC_MIN] = bin2bcd(tm->tm_min);	regs[RTC_SEC] = bin2bcd(tm->tm_sec);} static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm){	struct max8907_rtc *rtc = dev_get_drvdata(dev);	u8 regs[TIME_NUM];	int ret; 	ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs,			       TIME_NUM);	if (ret < 0)		return ret; 	regs_to_tm(regs, tm); 	return 0;} static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm){	struct max8907_rtc *rtc = dev_get_drvdata(dev);	u8 regs[TIME_NUM]; 	tm_to_regs(tm, regs); 	return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs,				 TIME_NUM);} static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm){	struct max8907_rtc *rtc = dev_get_drvdata(dev);	u8 regs[TIME_NUM];	unsigned int val;	int ret; 	ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,			       TIME_NUM);	if (ret < 0)		return ret; 	regs_to_tm(regs, &alrm->time); 	ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val);	if (ret < 0)		return ret; 	alrm->enabled = !!(val & 0x7f); 	return 0;} static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm){	struct max8907_rtc *rtc = dev_get_drvdata(dev);	u8 regs[TIME_NUM];	int ret; 	tm_to_regs(&alrm->time, regs); 	/* Disable alarm while we update the target time */	ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);	if (ret < 0)		return ret; 	ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,				TIME_NUM);	if (ret < 0)		return ret; 	if (alrm->enabled)		ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77); 	return ret;} static const struct rtc_class_ops max8907_rtc_ops = {	.read_time	= max8907_rtc_read_time,	.set_time	= max8907_rtc_set_time,	.read_alarm	= max8907_rtc_read_alarm,	.set_alarm	= max8907_rtc_set_alarm,}; static int max8907_rtc_probe(struct platform_device *pdev){	struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);	struct max8907_rtc *rtc;	int ret; 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);	if (!rtc)		return -ENOMEM;	platform_set_drvdata(pdev, rtc); 	rtc->max8907 = max8907;	rtc->regmap = max8907->regmap_rtc; 	rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc",					&max8907_rtc_ops, THIS_MODULE);	if (IS_ERR(rtc->rtc_dev)) {		ret = PTR_ERR(rtc->rtc_dev);		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);		return ret;	} 	rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc,				       MAX8907_IRQ_RTC_ALARM0);	if (rtc->irq < 0)		return rtc->irq; 	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,				max8907_irq_handler,				IRQF_ONESHOT, "max8907-alarm0", rtc);	if (ret < 0)		dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n",			rtc->irq, ret); 	return ret;} static struct platform_driver max8907_rtc_driver = {	.driver = {		.name = "max8907-rtc",	},	.probe = max8907_rtc_probe,};module_platform_driver(max8907_rtc_driver); MODULE_DESCRIPTION("Maxim MAX8907 RTC driver");MODULE_LICENSE("GPL v2");