linux/drivers/rtc/rtc-starfire.c
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   1/* rtc-starfire.c: Starfire platform RTC driver.
   2 *
   3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
   4 */
   5
   6#include <linux/kernel.h>
   7#include <linux/module.h>
   8#include <linux/init.h>
   9#include <linux/rtc.h>
  10#include <linux/platform_device.h>
  11
  12#include <asm/oplib.h>
  13
  14MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
  15MODULE_DESCRIPTION("Starfire RTC driver");
  16MODULE_LICENSE("GPL");
  17
  18static u32 starfire_get_time(void)
  19{
  20        static char obp_gettod[32];
  21        static u32 unix_tod;
  22
  23        sprintf(obp_gettod, "h# %08x unix-gettod",
  24                (unsigned int) (long) &unix_tod);
  25        prom_feval(obp_gettod);
  26
  27        return unix_tod;
  28}
  29
  30static int starfire_read_time(struct device *dev, struct rtc_time *tm)
  31{
  32        rtc_time_to_tm(starfire_get_time(), tm);
  33        return rtc_valid_tm(tm);
  34}
  35
  36static const struct rtc_class_ops starfire_rtc_ops = {
  37        .read_time      = starfire_read_time,
  38};
  39
  40static int __init starfire_rtc_probe(struct platform_device *pdev)
  41{
  42        struct rtc_device *rtc = rtc_device_register("starfire", &pdev->dev,
  43                                     &starfire_rtc_ops, THIS_MODULE);
  44        if (IS_ERR(rtc))
  45                return PTR_ERR(rtc);
  46
  47        platform_set_drvdata(pdev, rtc);
  48
  49        return 0;
  50}
  51
  52static int __exit starfire_rtc_remove(struct platform_device *pdev)
  53{
  54        struct rtc_device *rtc = platform_get_drvdata(pdev);
  55
  56        rtc_device_unregister(rtc);
  57
  58        return 0;
  59}
  60
  61static struct platform_driver starfire_rtc_driver = {
  62        .driver         = {
  63                .name   = "rtc-starfire",
  64                .owner  = THIS_MODULE,
  65        },
  66        .remove         = __exit_p(starfire_rtc_remove),
  67};
  68
  69static int __init starfire_rtc_init(void)
  70{
  71        return platform_driver_probe(&starfire_rtc_driver, starfire_rtc_probe);
  72}
  73
  74static void __exit starfire_rtc_exit(void)
  75{
  76        platform_driver_unregister(&starfire_rtc_driver);
  77}
  78
  79module_init(starfire_rtc_init);
  80module_exit(starfire_rtc_exit);
  81
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