drivers/rtc/rtc-parisc.c

   1 /* rtc-parisc: RTC for HP PA-RISC firmware
   2  *
   3  * Copyright (C) 2008 Kyle McMartin <kyle@mcmartin.ca>
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/time.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/rtc.h>
  11
  12 #include <asm/rtc.h>
  13
  14 static int parisc_get_time(struct device *dev, struct rtc_time *tm)
  15 {
  16         unsigned long ret;
  17
  18         ret = get_rtc_time(tm);
  19
  20         if (ret & RTC_BATT_BAD)
  21                 return -EOPNOTSUPP;
  22
  23         return rtc_valid_tm(tm);
  24 }
  25
  26 static int parisc_set_time(struct device *dev, struct rtc_time *tm)
  27 {
  28         if (set_rtc_time(tm) < 0)
  29                 return -EOPNOTSUPP;
  30
  31         return 0;
  32 }
  33
  34 static const struct rtc_class_ops parisc_rtc_ops = {
  35         .read_time = parisc_get_time,
  36         .set_time = parisc_set_time,
  37 };
  38
  39 static int __init parisc_rtc_probe(struct platform_device *dev)
  40 {
  41         struct rtc_device *rtc;
  42
  43         rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops,
  44                                   THIS_MODULE);
  45         if (IS_ERR(rtc))
  46                 return PTR_ERR(rtc);
  47
  48         platform_set_drvdata(dev, rtc);
  49
  50         return 0;
  51 }
  52
  53 static int __exit parisc_rtc_remove(struct platform_device *dev)
  54 {
  55         struct rtc_device *rtc = platform_get_drvdata(dev);
  56
  57         rtc_device_unregister(rtc);
  58
  59         return 0;
  60 }
  61
  62 static struct platform_driver parisc_rtc_driver = {
  63         .driver = {
  64                 .name = "rtc-parisc",
  65                 .owner = THIS_MODULE,
  66         },
  67         .probe = parisc_rtc_probe,
  68         .remove = __devexit_p(parisc_rtc_remove),
  69 };
  70
  71 static int __init parisc_rtc_init(void)
  72 {
  73         return platform_driver_probe(&parisc_rtc_driver, parisc_rtc_probe);
  74 }
  75
  76 static void __exit parisc_rtc_fini(void)
  77 {
  78         platform_driver_unregister(&parisc_rtc_driver);
  79 }
  80
  81 module_init(parisc_rtc_init);
  82 module_exit(parisc_rtc_fini);
  83
  84 MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
  85 MODULE_LICENSE("GPL");
  86 MODULE_DESCRIPTION("HP PA-RISC RTC driver");