drivers/rtc/rtc-ppc.c

   1 /*
   2  * RTC driver for ppc_md RTC functions
   3  *
   4  * © 2007 Red Hat, Inc.
   5  *
   6  * Author: David Woodhouse <dwmw2@infradead.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13
  14 #include <linux/module.h>
  15 #include <linux/err.h>
  16 #include <linux/rtc.h>
  17 #include <linux/platform_device.h>
  18 #include <asm/machdep.h>
  19
  20 static int ppc_rtc_read_time(struct device *dev, struct rtc_time *tm)
  21 {
  22         ppc_md.get_rtc_time(tm);
  23         return 0;
  24 }
  25
  26 static int ppc_rtc_set_time(struct device *dev, struct rtc_time *tm)
  27 {
  28         return ppc_md.set_rtc_time(tm);
  29 }
  30
  31 static const struct rtc_class_ops ppc_rtc_ops = {
  32         .set_time = ppc_rtc_set_time,
  33         .read_time = ppc_rtc_read_time,
  34 };
  35
  36 static struct rtc_device *rtc;
  37 static struct platform_device *ppc_rtc_pdev;
  38
  39 static int __init ppc_rtc_init(void)
  40 {
  41         if (!ppc_md.get_rtc_time || !ppc_md.set_rtc_time)
  42                 return -ENODEV;
  43
  44         ppc_rtc_pdev = platform_device_register_simple("ppc-rtc", 0, NULL, 0);
  45         if (IS_ERR(ppc_rtc_pdev))
  46                 return PTR_ERR(ppc_rtc_pdev);
  47
  48         rtc = rtc_device_register("ppc_md", &ppc_rtc_pdev->dev,
  49                                   &ppc_rtc_ops, THIS_MODULE);
  50         if (IS_ERR(rtc)) {
  51                 platform_device_unregister(ppc_rtc_pdev);
  52                 return PTR_ERR(rtc);
  53         }
  54
  55         return 0;
  56 }
  57
  58 static void __exit ppc_rtc_exit(void)
  59 {
  60         rtc_device_unregister(rtc);
  61         platform_device_unregister(ppc_rtc_pdev);
  62 }
  63
  64 module_init(ppc_rtc_init);
  65 module_exit(ppc_rtc_exit);
  66
  67 MODULE_LICENSE("GPL");
  68 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
  69 MODULE_DESCRIPTION("Generic RTC class driver for PowerPC");