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Linux/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                 .owner  = THIS_MODULE,
 58         },
 59 };
 60 
 61 module_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);
 62 

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