// SPDX-License-Identifier: GPL-2.0/* *  pcap rtc code for Motorola EZX phones * *  Copyright (c) 2008 guiming zhuo <gmzhuo@gmail.com> *  Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com> * *  Based on Motorola's rtc.c Copyright (c) 2003-2005 Motorola */ #include <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/mfd/ezx-pcap.h>#include <linux/rtc.h>#include <linux/slab.h>#include <linux/platform_device.h> struct pcap_rtc {	struct pcap_chip *pcap;	struct rtc_device *rtc;}; static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc){	struct pcap_rtc *pcap_rtc = _pcap_rtc;	unsigned long rtc_events; 	if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ))		rtc_events = RTC_IRQF | RTC_UF;	else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA))		rtc_events = RTC_IRQF | RTC_AF;	else		rtc_events = 0; 	rtc_update_irq(pcap_rtc->rtc, 1, rtc_events);	return IRQ_HANDLED;} static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm){	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);	struct rtc_time *tm = &alrm->time;	unsigned long secs;	u32 tod;	/* time of day, seconds since midnight */	u32 days;	/* days since 1/1/1970 */ 	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);	secs = tod & PCAP_RTC_TOD_MASK; 	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);	secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY; 	rtc_time64_to_tm(secs, tm); 	return 0;} static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm){	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);	unsigned long secs = rtc_tm_to_time64(&alrm->time);	u32 tod, days; 	tod = secs % SEC_PER_DAY;	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod); 	days = secs / SEC_PER_DAY;	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days); 	return 0;} static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm){	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);	unsigned long secs;	u32 tod, days; 	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);	secs = tod & PCAP_RTC_TOD_MASK; 	ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);	secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY; 	rtc_time64_to_tm(secs, tm); 	return 0;} static int pcap_rtc_set_time(struct device *dev, struct rtc_time *tm){	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);	unsigned long secs = rtc_tm_to_time64(tm);	u32 tod, days; 	tod = secs % SEC_PER_DAY;	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod); 	days = secs / SEC_PER_DAY;	ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days); 	return 0;} static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en){	struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev); 	if (en)		enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));	else		disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq)); 	return 0;} static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en){	return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);} static const struct rtc_class_ops pcap_rtc_ops = {	.read_time = pcap_rtc_read_time,	.set_time = pcap_rtc_set_time,	.read_alarm = pcap_rtc_read_alarm,	.set_alarm = pcap_rtc_set_alarm,	.alarm_irq_enable = pcap_rtc_alarm_irq_enable,}; static int __init pcap_rtc_probe(struct platform_device *pdev){	struct pcap_rtc *pcap_rtc;	int timer_irq, alarm_irq;	int err = -ENOMEM; 	pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),				GFP_KERNEL);	if (!pcap_rtc)		return err; 	pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent); 	platform_set_drvdata(pdev, pcap_rtc); 	pcap_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);	if (IS_ERR(pcap_rtc->rtc))		return PTR_ERR(pcap_rtc->rtc); 	pcap_rtc->rtc->ops = &pcap_rtc_ops;	pcap_rtc->rtc->range_max = (1 << 14) * 86400ULL - 1; 	timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);	alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA); 	err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,				"RTC Timer", pcap_rtc);	if (err)		return err; 	err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,				"RTC Alarm", pcap_rtc);	if (err)		return err; 	return devm_rtc_register_device(pcap_rtc->rtc);} static int __exit pcap_rtc_remove(struct platform_device *pdev){	return 0;} static struct platform_driver pcap_rtc_driver = {	.remove = __exit_p(pcap_rtc_remove),	.driver = {		.name  = "pcap-rtc",	},}; module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe); MODULE_DESCRIPTION("Motorola pcap rtc driver");MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");MODULE_LICENSE("GPL");