blob: 346d633655e79d1841fe61df46c11a6ae8b39207 [file] [log] [blame]
Kyle McMartin9eb16862008-09-10 14:24:07 +00001/* 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
11#include <asm/rtc.h>
12
13/* as simple as can be, and no simpler. */
14struct parisc_rtc {
15 struct rtc_device *rtc;
16 spinlock_t lock;
17};
18
19static int parisc_get_time(struct device *dev, struct rtc_time *tm)
20{
21 struct parisc_rtc *p = dev_get_drvdata(dev);
22 unsigned long flags, ret;
23
24 spin_lock_irqsave(&p->lock, flags);
25 ret = get_rtc_time(tm);
26 spin_unlock_irqrestore(&p->lock, flags);
27
28 if (ret & RTC_BATT_BAD)
29 return -EOPNOTSUPP;
30
31 return 0;
32}
33
34static int parisc_set_time(struct device *dev, struct rtc_time *tm)
35{
36 struct parisc_rtc *p = dev_get_drvdata(dev);
37 unsigned long flags, ret;
38
39 spin_lock_irqsave(&p->lock, flags);
40 ret = set_rtc_time(tm);
41 spin_unlock_irqrestore(&p->lock, flags);
42
43 if (ret < 0)
44 return -EOPNOTSUPP;
45
46 return 0;
47}
48
49static const struct rtc_class_ops parisc_rtc_ops = {
50 .read_time = parisc_get_time,
51 .set_time = parisc_set_time,
52};
53
54static int __devinit parisc_rtc_probe(struct platform_device *dev)
55{
56 struct parisc_rtc *p;
57
58 p = kzalloc(sizeof (*p), GFP_KERNEL);
59 if (!p)
60 return -ENOMEM;
61
62 spin_lock_init(&p->lock);
63
64 p->rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops,
65 THIS_MODULE);
66 if (IS_ERR(p->rtc)) {
67 int err = PTR_ERR(p->rtc);
68 kfree(p);
69 return err;
70 }
71
72 platform_set_drvdata(dev, p);
73
74 return 0;
75}
76
77static int __devexit parisc_rtc_remove(struct platform_device *dev)
78{
79 struct parisc_rtc *p = platform_get_drvdata(dev);
80
81 rtc_device_unregister(p->rtc);
82 kfree(p);
83
84 return 0;
85}
86
87static struct platform_driver parisc_rtc_driver = {
88 .driver = {
89 .name = "rtc-parisc",
90 .owner = THIS_MODULE,
91 },
92 .probe = parisc_rtc_probe,
93 .remove = __devexit_p(parisc_rtc_remove),
94};
95
96static int __init parisc_rtc_init(void)
97{
98 return platform_driver_register(&parisc_rtc_driver);
99}
100
101static void __exit parisc_rtc_fini(void)
102{
103 platform_driver_unregister(&parisc_rtc_driver);
104}
105
106module_init(parisc_rtc_init);
107module_exit(parisc_rtc_fini);
108
109MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
110MODULE_LICENSE("GPL");
111MODULE_DESCRIPTION("HP PA-RISC RTC driver");