LXR linux/drivers/rtc/rtc-generic.c

   1/* rtc-generic: RTC driver using the generic RTC abstraction
   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
  14static int generic_get_time(struct device *dev, struct rtc_time *tm)
  15{
  16        unsigned int ret = get_rtc_time(tm);
  17
  18        if (ret & RTC_BATT_BAD)
  19                return -EOPNOTSUPP;
  20
  21        return rtc_valid_tm(tm);
  22}
  23
  24static int generic_set_time(struct device *dev, struct rtc_time *tm)
  25{
  26        if (set_rtc_time(tm) < 0)
  27                return -EOPNOTSUPP;
  28
  29        return 0;
  30}
  31
  32static const struct rtc_class_ops generic_rtc_ops = {
  33        .read_time = generic_get_time,
  34        .set_time = generic_set_time,
  35};
  36
  37static int __init generic_rtc_probe(struct platform_device *dev)
  38{
  39        struct rtc_device *rtc;
  40
  41        rtc = rtc_device_register("rtc-generic", &dev->dev, &generic_rtc_ops,
  42                                  THIS_MODULE);
  43        if (IS_ERR(rtc))
  44                return PTR_ERR(rtc);
  45
  46        platform_set_drvdata(dev, rtc);
  47
  48        return 0;
  49}
  50
  51static int __exit generic_rtc_remove(struct platform_device *dev)
  52{
  53        struct rtc_device *rtc = platform_get_drvdata(dev);
  54
  55        rtc_device_unregister(rtc);
  56
  57        return 0;
  58}
  59
  60static struct platform_driver generic_rtc_driver = {
  61        .driver = {
  62                .name = "rtc-generic",
  63                .owner = THIS_MODULE,
  64        },
  65        .remove = __exit_p(generic_rtc_remove),
  66};
  67
  68static int __init generic_rtc_init(void)
  69{
  70        return platform_driver_probe(&generic_rtc_driver, generic_rtc_probe);
  71}
  72
  73static void __exit generic_rtc_fini(void)
  74{
  75        platform_driver_unregister(&generic_rtc_driver);
  76}
  77
  78module_init(generic_rtc_init);
  79module_exit(generic_rtc_fini);
  80
  81MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
  82MODULE_LICENSE("GPL");
  83MODULE_DESCRIPTION("Generic RTC driver");
  84MODULE_ALIAS("platform:rtc-generic");
  85