// 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 struct platform_driver pcap_rtc_driver = {
        .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");