Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/adaptation/renesas_rcar/renesas_kernel.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 = 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");