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 static int parisc_get_time(struct device *dev, struct rtc_time *tm)
  15 {
  16         unsigned long ret;
  17
  18         ret = get_rtc_time(tm);
  19
  20         if (ret & RTC_BATT_BAD)
  21                 return -EOPNOTSUPP;
  22
  23         return rtc_valid_tm(tm);
  24 }
  25
  26 static int parisc_set_time(struct device *dev, struct rtc_time *tm)
  27 {
  28         int ret;
  29
  30         ret = set_rtc_time(tm);
  31
  32         if (ret < 0)
  33                 return -EOPNOTSUPP;
  34
  35         return 0;
  36 }
  37
  38 static const struct rtc_class_ops parisc_rtc_ops = {
  39         .read_time = parisc_get_time,
  40         .set_time = parisc_set_time,
  41 };
  42
  43 static int __devinit parisc_rtc_probe(struct platform_device *dev)
  44 {
  45         struct rtc_device *p;
  46
  47         p = kzalloc(sizeof (*p), GFP_KERNEL);
  48         if (!p)
  49                 return -ENOMEM;
  50
  51         p = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops,
  52                                 THIS_MODULE);
  53         if (IS_ERR(p)) {
  54                 int err = PTR_ERR(p);
  55                 kfree(p);
  56                 return err;
  57         }
  58
  59         platform_set_drvdata(dev, p);
  60
  61         return 0;
  62 }
  63
  64 static int __devexit parisc_rtc_remove(struct platform_device *dev)
  65 {
  66         struct rtc_device *p = platform_get_drvdata(dev);
  67
  68         rtc_device_unregister(p);
  69         kfree(p);
  70
  71         return 0;
  72 }
  73
  74 static struct platform_driver parisc_rtc_driver = {
  75         .driver = {
  76                 .name = "rtc-parisc",
  77                 .owner = THIS_MODULE,
  78         },
  79         .probe = parisc_rtc_probe,
  80         .remove = __devexit_p(parisc_rtc_remove),
  81 };
  82
  83 static int __init parisc_rtc_init(void)
  84 {
  85         return platform_driver_register(&parisc_rtc_driver);
  86 }
  87
  88 static void __exit parisc_rtc_fini(void)
  89 {
  90         platform_driver_unregister(&parisc_rtc_driver);
  91 }
  92
  93 module_init(parisc_rtc_init);
  94 module_exit(parisc_rtc_fini);
  95
  96 MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
  97 MODULE_LICENSE("GPL");
  98 MODULE_DESCRIPTION("HP PA-RISC RTC driver");