drivers/rtc/rtc-pcap.c

   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/platform_device.h>
  21
  22 struct pcap_rtc {
  23         struct pcap_chip *pcap;
  24         struct rtc_device *rtc;
  25 };
  26
  27 static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc)
  28 {
  29         struct pcap_rtc *pcap_rtc = _pcap_rtc;
  30         unsigned long rtc_events;
  31
  32         if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ))
  33                 rtc_events = RTC_IRQF | RTC_UF;
  34         else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA))
  35                 rtc_events = RTC_IRQF | RTC_AF;
  36         else
  37                 rtc_events = 0;
  38
  39         rtc_update_irq(pcap_rtc->rtc, 1, rtc_events);
  40         return IRQ_HANDLED;
  41 }
  42
  43 static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
  44 {
  45         struct platform_device *pdev = to_platform_device(dev);
  46         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
  47         struct rtc_time *tm = &alrm->time;
  48         unsigned long secs;
  49         u32 tod;        /* time of day, seconds since midnight */
  50         u32 days;       /* days since 1/1/1970 */
  51
  52         ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod);
  53         secs = tod & PCAP_RTC_TOD_MASK;
  54
  55         ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days);
  56         secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
  57
  58         rtc_time_to_tm(secs, tm);
  59
  60         return 0;
  61 }
  62
  63 static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
  64 {
  65         struct platform_device *pdev = to_platform_device(dev);
  66         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
  67         struct rtc_time *tm = &alrm->time;
  68         unsigned long secs;
  69         u32 tod, days;
  70
  71         rtc_tm_to_time(tm, &secs);
  72
  73         tod = secs % SEC_PER_DAY;
  74         ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod);
  75
  76         days = secs / SEC_PER_DAY;
  77         ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days);
  78
  79         return 0;
  80 }
  81
  82 static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm)
  83 {
  84         struct platform_device *pdev = to_platform_device(dev);
  85         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
  86         unsigned long secs;
  87         u32 tod, days;
  88
  89         ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod);
  90         secs = tod & PCAP_RTC_TOD_MASK;
  91
  92         ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days);
  93         secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY;
  94
  95         rtc_time_to_tm(secs, tm);
  96
  97         return rtc_valid_tm(tm);
  98 }
  99
 100 static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs)
 101 {
 102         struct platform_device *pdev = to_platform_device(dev);
 103         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
 104         u32 tod, days;
 105
 106         tod = secs % SEC_PER_DAY;
 107         ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod);
 108
 109         days = secs / SEC_PER_DAY;
 110         ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days);
 111
 112         return 0;
 113 }
 114
 115 static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en)
 116 {
 117         struct platform_device *pdev = to_platform_device(dev);
 118         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
 119
 120         if (en)
 121                 enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
 122         else
 123                 disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq));
 124
 125         return 0;
 126 }
 127
 128 static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
 129 {
 130         return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en);
 131 }
 132
 133 static int pcap_rtc_update_irq_enable(struct device *dev, unsigned int en)
 134 {
 135         return pcap_rtc_irq_enable(dev, PCAP_IRQ_1HZ, en);
 136 }
 137
 138 static const struct rtc_class_ops pcap_rtc_ops = {
 139         .read_time = pcap_rtc_read_time,
 140         .read_alarm = pcap_rtc_read_alarm,
 141         .set_alarm = pcap_rtc_set_alarm,
 142         .set_mmss = pcap_rtc_set_mmss,
 143         .alarm_irq_enable = pcap_rtc_alarm_irq_enable,
 144         .update_irq_enable = pcap_rtc_update_irq_enable,
 145 };
 146
 147 static int __devinit pcap_rtc_probe(struct platform_device *pdev)
 148 {
 149         struct pcap_rtc *pcap_rtc;
 150         int timer_irq, alarm_irq;
 151         int err = -ENOMEM;
 152
 153         pcap_rtc = kmalloc(sizeof(struct pcap_rtc), GFP_KERNEL);
 154         if (!pcap_rtc)
 155                 return err;
 156
 157         pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent);
 158
 159         pcap_rtc->rtc = rtc_device_register("pcap", &pdev->dev,
 160                                   &pcap_rtc_ops, THIS_MODULE);
 161         if (IS_ERR(pcap_rtc->rtc)) {
 162                 err = PTR_ERR(pcap_rtc->rtc);
 163                 goto fail_rtc;
 164         }
 165
 166         platform_set_drvdata(pdev, pcap_rtc);
 167
 168         timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ);
 169         alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA);
 170
 171         err = request_irq(timer_irq, pcap_rtc_irq, 0, "RTC Timer", pcap_rtc);
 172         if (err)
 173                 goto fail_timer;
 174
 175         err = request_irq(alarm_irq, pcap_rtc_irq, 0, "RTC Alarm", pcap_rtc);
 176         if (err)
 177                 goto fail_alarm;
 178
 179         return 0;
 180 fail_alarm:
 181         free_irq(timer_irq, pcap_rtc);
 182 fail_timer:
 183         rtc_device_unregister(pcap_rtc->rtc);
 184 fail_rtc:
 185         kfree(pcap_rtc);
 186         return err;
 187 }
 188
 189 static int __devexit pcap_rtc_remove(struct platform_device *pdev)
 190 {
 191         struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev);
 192
 193         free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ), pcap_rtc);
 194         free_irq(pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA), pcap_rtc);
 195         rtc_device_unregister(pcap_rtc->rtc);
 196         kfree(pcap_rtc);
 197
 198         return 0;
 199 }
 200
 201 static struct platform_driver pcap_rtc_driver = {
 202         .remove = __devexit_p(pcap_rtc_remove),
 203         .driver = {
 204                 .name  = "pcap-rtc",
 205                 .owner = THIS_MODULE,
 206         },
 207 };
 208
 209 static int __init rtc_pcap_init(void)
 210 {
 211         return platform_driver_probe(&pcap_rtc_driver, pcap_rtc_probe);
 212 }
 213
 214 static void __exit rtc_pcap_exit(void)
 215 {
 216         platform_driver_unregister(&pcap_rtc_driver);
 217 }
 218
 219 module_init(rtc_pcap_init);
 220 module_exit(rtc_pcap_exit);
 221
 222 MODULE_DESCRIPTION("Motorola pcap rtc driver");
 223 MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>");
 224 MODULE_LICENSE("GPL");