linux/drivers/rtc/rtc-pcap.c
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   1/*
   2 *  pcap rtc code for Motorola EZX phones
   3 *
   4 *  Copyright (c) 2008 guiming zhuo <gmzhuo@gmail.com>
   5 *  Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>
   6 *
   7 *  Based on Motorola's rtc.c Copyright (c) 2003-2005 Motorola
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License version 2 as
  11 *  published by the Free Software Foundation.
  12 *
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/mfd/ezx-pcap.h>
  19#include <linux/rtc.h>
  20#include <linux/slab.h>
  21#include <linux/platform_device.h>
  22
  23struct pcap_rtc {
  24        struct pcap_chip *pcap;
  25        struct rtc_device *rtc;
  26};
  27
  28static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc)
  29{
  30        struct pcap_rtc *pcap_rtc = _pcap_rtc;
  31        unsigned long rtc_events;
  32
  33        if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ))
  34                rtc_events = RTC_IRQF | RTC_UF;
  35        else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA))
  36                rtc_events = RTC_IRQF | RTC_AF;
  37        else
  38                rtc_events = 0;
  39
  40        rtc_update_irq(pcap_rtc->rtc, 1, rtc_events);
  41        return IRQ_HANDLED;
  42}
  43
  44static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
  45{
  46        struct platform_device *pdev = to_platform_device(dev);
  47        struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
  48        struct rtc_time *tm = &alrm->time;
  49        unsigned long secs;
  50        u32 tod;        /* time of day, seconds since midnight */
  51        u32 days;       /* days since 1/1/1970 */
  52
  53        ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);
  54        secs = tod & PCAP_RTC_TOD_MASK;
  55
  56        ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);
  57        secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
  58
  59        rtc_time_to_tm(secs, tm);
  60
  61        return 0;
  62}
  63
  64static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
  65{
  66        struct platform_device *pdev = to_platform_device(dev);
  67        struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
  68        struct rtc_time *tm = &alrm->time;
  69        unsigned long secs;
  70        u32 tod, days;
  71
  72        rtc_tm_to_time(tm, &secs);
  73
  74        tod = secs % SEC_PER_DAY;
  75        ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);
  76
  77        days = secs / SEC_PER_DAY;
  78        ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);
  79
  80        return 0;
  81}
  82
  83static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm)
  84{
  85        struct platform_device *pdev = to_platform_device(dev);
  86        struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
  87        unsigned long secs;
  88        u32 tod, days;
  89
  90        ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);
  91        secs = tod & PCAP_RTC_TOD_MASK;
  92
  93        ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);
  94        secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
  95
  96        rtc_time_to_tm(secs, tm);
  97
  98        return rtc_valid_tm(tm);
  99}
 100
 101static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs)
 102{
 103        struct platform_device *pdev = to_platform_device(dev);
 104        struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
 105        u32 tod, days;
 106
 107        tod = secs % SEC_PER_DAY;
 108        ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);
 109
 110        days = secs / SEC_PER_DAY;
 111        ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);
 112
 113        return 0;
 114}
 115
 116static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)
 117{
 118        struct platform_device *pdev = to_platform_device(dev);
 119        struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
 120
 121        if (en)
 122                enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
 123        else
 124                disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
 125
 126        return 0;
 127}
 128
 129static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
 130{
 131        return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);
 132}
 133
 134static const struct rtc_class_ops pcap_rtc_ops = {
 135        .read_time = pcap_rtc_read_time,
 136        .read_alarm = pcap_rtc_read_alarm,
 137        .set_alarm = pcap_rtc_set_alarm,
 138        .set_mmss = pcap_rtc_set_mmss,
 139        .alarm_irq_enable = pcap_rtc_alarm_irq_enable,
 140};
 141
 142static int __init pcap_rtc_probe(struct platform_device *pdev)
 143{
 144        struct pcap_rtc *pcap_rtc;
 145        int timer_irq, alarm_irq;
 146        int err = -ENOMEM;
 147
 148        pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc),
 149                                GFP_KERNEL);
 150        if (!pcap_rtc)
 151                return err;
 152
 153        pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
 154
 155        platform_set_drvdata(pdev, pcap_rtc);
 156
 157        pcap_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcap",
 158                                        &pcap_rtc_ops, THIS_MODULE);
 159        if (IS_ERR(pcap_rtc->rtc))
 160                return PTR_ERR(pcap_rtc->rtc);
 161
 162        timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
 163        alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
 164
 165        err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0,
 166                                "RTC Timer", pcap_rtc);
 167        if (err)
 168                return err;
 169
 170        err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0,
 171                                "RTC Alarm", pcap_rtc);
 172        if (err)
 173                return err;
 174
 175        return 0;
 176}
 177
 178static int __exit pcap_rtc_remove(struct platform_device *pdev)
 179{
 180        return 0;
 181}
 182
 183static struct platform_driver pcap_rtc_driver = {
 184        .remove = __exit_p(pcap_rtc_remove),
 185        .driver = {
 186                .name  = "pcap-rtc",
 187                .owner = THIS_MODULE,
 188        },
 189};
 190
 191module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe);
 192
 193MODULE_DESCRIPTION("Motorola pcap rtc driver");
 194MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
 195MODULE_LICENSE("GPL");
 196
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