drivers/rtc/rtc-parisc.c

   1 /* rtc-parisc: RTC for HP PA-RISC firmware
   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 /* as simple as can be, and no simpler. */
  15 struct parisc_rtc {
  16         struct rtc_device *rtc;
  17 };
  18
  19 static int parisc_get_time(struct device *dev, struct rtc_time *tm)
  20 {
  21         unsigned long ret;
  22
  23         ret = get_rtc_time(tm);
  24
  25         if (ret & RTC_BATT_BAD)
  26                 return -EOPNOTSUPP;
  27
  28         return 0;
  29 }
  30
  31 static int parisc_set_time(struct device *dev, struct rtc_time *tm)
  32 {
  33         int ret;
  34
  35         ret = set_rtc_time(tm);
  36
  37         if (ret < 0)
  38                 return -EOPNOTSUPP;
  39
  40         return 0;
  41 }
  42
  43 static const struct rtc_class_ops parisc_rtc_ops = {
  44         .read_time = parisc_get_time,
  45         .set_time = parisc_set_time,
  46 };
  47
  48 static int __devinit parisc_rtc_probe(struct platform_device *dev)
  49 {
  50         struct parisc_rtc *p;
  51
  52         p = kzalloc(sizeof (*p), GFP_KERNEL);
  53         if (!p)
  54                 return -ENOMEM;
  55
  56         p->rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops,
  57                                         THIS_MODULE);
  58         if (IS_ERR(p->rtc)) {
  59                 int err = PTR_ERR(p->rtc);
  60                 kfree(p);
  61                 return err;
  62         }
  63
  64         platform_set_drvdata(dev, p);
  65
  66         return 0;
  67 }
  68
  69 static int __devexit parisc_rtc_remove(struct platform_device *dev)
  70 {
  71         struct parisc_rtc *p = platform_get_drvdata(dev);
  72
  73         rtc_device_unregister(p->rtc);
  74         kfree(p);
  75
  76         return 0;
  77 }
  78
  79 static struct platform_driver parisc_rtc_driver = {
  80         .driver = {
  81                 .name = "rtc-parisc",
  82                 .owner = THIS_MODULE,
  83         },
  84         .probe = parisc_rtc_probe,
  85         .remove = __devexit_p(parisc_rtc_remove),
  86 };
  87
  88 static int __init parisc_rtc_init(void)
  89 {
  90         return platform_driver_register(&parisc_rtc_driver);
  91 }
  92
  93 static void __exit parisc_rtc_fini(void)
  94 {
  95         platform_driver_unregister(&parisc_rtc_driver);
  96 }
  97
  98 module_init(parisc_rtc_init);
  99 module_exit(parisc_rtc_fini);
 100
 101 MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
 102 MODULE_LICENSE("GPL");
 103 MODULE_DESCRIPTION("HP PA-RISC RTC driver");