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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 
 14 static 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 
 24 static 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 
 32 static const struct rtc_class_ops generic_rtc_ops = {
 33         .read_time = generic_get_time,
 34         .set_time = generic_set_time,
 35 };
 36 
 37 static int __init generic_rtc_probe(struct platform_device *dev)
 38 {
 39         struct rtc_device *rtc;
 40 
 41         rtc = devm_rtc_device_register(&dev->dev, "rtc-generic",
 42                                         &generic_rtc_ops, 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 
 51 static struct platform_driver generic_rtc_driver = {
 52         .driver = {
 53                 .name = "rtc-generic",
 54                 .owner = THIS_MODULE,
 55         },
 56 };
 57 
 58 module_platform_driver_probe(generic_rtc_driver, generic_rtc_probe);
 59 
 60 MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
 61 MODULE_LICENSE("GPL");
 62 MODULE_DESCRIPTION("Generic RTC driver");
 63 MODULE_ALIAS("platform:rtc-generic");
 64 

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