drivers/rtc/rtc-starfire.c

   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
  14 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
  15 MODULE_DESCRIPTION("Starfire RTC driver");
  16 MODULE_LICENSE("GPL");
  17
  18 static 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
  30 static 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
  36 static const struct rtc_class_ops starfire_rtc_ops = {
  37         .read_time      = starfire_read_time,
  38 };
  39
  40 static int __init starfire_rtc_probe(struct platform_device *pdev)
  41 {
  42         struct rtc_device *rtc;
  43
  44         rtc = devm_rtc_device_register(&pdev->dev, "starfire",
  45                                 &starfire_rtc_ops, THIS_MODULE);
  46         if (IS_ERR(rtc))
  47                 return PTR_ERR(rtc);
  48
  49         platform_set_drvdata(pdev, rtc);
  50
  51         return 0;
  52 }
  53
  54 static struct platform_driver starfire_rtc_driver = {
  55         .driver         = {
  56                 .name   = "rtc-starfire",
  57         },
  58 };
  59
  60 module_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);