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1// SPDX-License-Identifier: GPL-2.02/*3 * pcap rtc code for Motorola EZX phones4 *5 * Copyright (c) 2008 guiming zhuo <gmzhuo@gmail.com>6 * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>7 *8 * Based on Motorola's rtc.c Copyright (c) 2003-2005 Motorola9 */10 11#include <linux/kernel.h>12#include <linux/module.h>13#include <linux/init.h>14#include <linux/mfd/ezx-pcap.h>15#include <linux/rtc.h>16#include <linux/slab.h>17#include <linux/platform_device.h>18 19struct pcap_rtc {20 struct pcap_chip *pcap;21 struct rtc_device *rtc;22};23 24static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc)25{26 struct pcap_rtc *pcap_rtc = _pcap_rtc;27 unsigned long rtc_events;28 29 if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ))30 rtc_events = RTC_IRQF | RTC_UF;31 else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA))32 rtc_events = RTC_IRQF | RTC_AF;33 else34 rtc_events = 0;35 36 rtc_update_irq(pcap_rtc->rtc, 1, rtc_events);37 return IRQ_HANDLED;38}39 40static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)41{42 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);43 struct rtc_time *tm = &alrm->time;44 unsigned long secs;45 u32 tod; /* time of day, seconds since midnight */46 u32 days; /* days since 1/1/1970 */47 48 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);49 secs = tod & PCAP_RTC_TOD_MASK;50 51 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);52 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;53 54 rtc_time64_to_tm(secs, tm);55 56 return 0;57}58 59static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)60{61 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);62 unsigned long secs = rtc_tm_to_time64(&alrm->time);63 u32 tod, days;64 65 tod = secs % SEC_PER_DAY;66 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);67 68 days = secs / SEC_PER_DAY;69 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);70 71 return 0;72}73 74static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm)75{76 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);77 unsigned long secs;78 u32 tod, days;79 80 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);81 secs = tod & PCAP_RTC_TOD_MASK;82 83 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);84 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;85 86 rtc_time64_to_tm(secs, tm);87 88 return 0;89}90 91static int pcap_rtc_set_time(struct device *dev, struct rtc_time *tm)92{93 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);94 unsigned long secs = rtc_tm_to_time64(tm);95 u32 tod, days;96 97 tod = secs % SEC_PER_DAY;98 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);99 100 days = secs / SEC_PER_DAY;101 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);102 103 return 0;104}105 106static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)107{108 struct pcap_rtc *pcap_rtc = dev_get_drvdata(dev);109 110 if (en)111 enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));112 else113 disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));114 115 return 0;116}117 118static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)119{120 return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);121}122 123static const struct rtc_class_ops pcap_rtc_ops = {124 .read_time = pcap_rtc_read_time,125 .set_time = pcap_rtc_set_time,126 .read_alarm = pcap_rtc_read_alarm,127 .set_alarm = pcap_rtc_set_alarm,128 .alarm_irq_enable = pcap_rtc_alarm_irq_enable,129};130 131static int __init pcap_rtc_probe(struct platform_device *pdev)132{133 struct pcap_rtc *pcap_rtc;134 int timer_irq, alarm_irq;135 int err = -ENOMEM;136 137 pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),138 GFP_KERNEL);139 if (!pcap_rtc)140 return err;141 142 pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);143 144 platform_set_drvdata(pdev, pcap_rtc);145 146 pcap_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);147 if (IS_ERR(pcap_rtc->rtc))148 return PTR_ERR(pcap_rtc->rtc);149 150 pcap_rtc->rtc->ops = &pcap_rtc_ops;151 pcap_rtc->rtc->range_max = (1 << 14) * 86400ULL - 1;152 153 timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);154 alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);155 156 err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,157 "RTC Timer", pcap_rtc);158 if (err)159 return err;160 161 err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,162 "RTC Alarm", pcap_rtc);163 if (err)164 return err;165 166 return devm_rtc_register_device(pcap_rtc->rtc);167}168 169static struct platform_driver pcap_rtc_driver = {170 .driver = {171 .name = "pcap-rtc",172 },173};174 175module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);176 177MODULE_DESCRIPTION("Motorola pcap rtc driver");178MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");179MODULE_LICENSE("GPL");180