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Linux/drivers/rtc/rtc-starfire.c

  1 /* rtc-starfire.c: Starfire platform RTC driver.
  2  *
  3  * Author: David S. Miller
  4  * License: GPL
  5  *
  6  * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
  7  */
  8 
  9 #include <linux/kernel.h>
 10 #include <linux/init.h>
 11 #include <linux/rtc.h>
 12 #include <linux/platform_device.h>
 13 
 14 #include <asm/oplib.h>
 15 
 16 static u32 starfire_get_time(void)
 17 {
 18         static char obp_gettod[32];
 19         static u32 unix_tod;
 20 
 21         sprintf(obp_gettod, "h# %08x unix-gettod",
 22                 (unsigned int) (long) &unix_tod);
 23         prom_feval(obp_gettod);
 24 
 25         return unix_tod;
 26 }
 27 
 28 static int starfire_read_time(struct device *dev, struct rtc_time *tm)
 29 {
 30         rtc_time_to_tm(starfire_get_time(), tm);
 31         return rtc_valid_tm(tm);
 32 }
 33 
 34 static const struct rtc_class_ops starfire_rtc_ops = {
 35         .read_time      = starfire_read_time,
 36 };
 37 
 38 static int __init starfire_rtc_probe(struct platform_device *pdev)
 39 {
 40         struct rtc_device *rtc;
 41 
 42         rtc = devm_rtc_device_register(&pdev->dev, "starfire",
 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 
 52 static struct platform_driver starfire_rtc_driver = {
 53         .driver         = {
 54                 .name   = "rtc-starfire",
 55         },
 56 };
 57 
 58 builtin_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);
 59 

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