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Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[karo-tx-linux.git] / 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 = rtc_device_register("rtc-generic", &dev->dev, &generic_rtc_ops,
42                                   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 int __exit generic_rtc_remove(struct platform_device *dev)
52 {
53         struct rtc_device *rtc = platform_get_drvdata(dev);
54
55         rtc_device_unregister(rtc);
56
57         return 0;
58 }
59
60 static struct platform_driver generic_rtc_driver = {
61         .driver = {
62                 .name = "rtc-generic",
63                 .owner = THIS_MODULE,
64         },
65         .remove = __exit_p(generic_rtc_remove),
66 };
67
68 static int __init generic_rtc_init(void)
69 {
70         return platform_driver_probe(&generic_rtc_driver, generic_rtc_probe);
71 }
72
73 static void __exit generic_rtc_fini(void)
74 {
75         platform_driver_unregister(&generic_rtc_driver);
76 }
77
78 module_init(generic_rtc_init);
79 module_exit(generic_rtc_fini);
80
81 MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
82 MODULE_LICENSE("GPL");
83 MODULE_DESCRIPTION("Generic RTC driver");
84 MODULE_ALIAS("platform:rtc-generic");