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9eb16864 KM |
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 | ||
11 | #include <asm/rtc.h> | |
12 | ||
13 | /* as simple as can be, and no simpler. */ | |
14 | struct parisc_rtc { | |
15 | struct rtc_device *rtc; | |
16 | spinlock_t lock; | |
17 | }; | |
18 | ||
19 | static 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 | ||
34 | static int parisc_set_time(struct device *dev, struct rtc_time *tm) | |
35 | { | |
36 | struct parisc_rtc *p = dev_get_drvdata(dev); | |
022b7690 RK |
37 | unsigned long flags; |
38 | int ret; | |
9eb16864 KM |
39 | |
40 | spin_lock_irqsave(&p->lock, flags); | |
41 | ret = set_rtc_time(tm); | |
42 | spin_unlock_irqrestore(&p->lock, flags); | |
43 | ||
44 | if (ret < 0) | |
45 | return -EOPNOTSUPP; | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | static const struct rtc_class_ops parisc_rtc_ops = { | |
51 | .read_time = parisc_get_time, | |
52 | .set_time = parisc_set_time, | |
53 | }; | |
54 | ||
55 | static int __devinit parisc_rtc_probe(struct platform_device *dev) | |
56 | { | |
57 | struct parisc_rtc *p; | |
58 | ||
59 | p = kzalloc(sizeof (*p), GFP_KERNEL); | |
60 | if (!p) | |
61 | return -ENOMEM; | |
62 | ||
63 | spin_lock_init(&p->lock); | |
64 | ||
65 | p->rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops, | |
66 | THIS_MODULE); | |
67 | if (IS_ERR(p->rtc)) { | |
68 | int err = PTR_ERR(p->rtc); | |
69 | kfree(p); | |
70 | return err; | |
71 | } | |
72 | ||
73 | platform_set_drvdata(dev, p); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static int __devexit parisc_rtc_remove(struct platform_device *dev) | |
79 | { | |
80 | struct parisc_rtc *p = platform_get_drvdata(dev); | |
81 | ||
82 | rtc_device_unregister(p->rtc); | |
83 | kfree(p); | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static struct platform_driver parisc_rtc_driver = { | |
89 | .driver = { | |
90 | .name = "rtc-parisc", | |
91 | .owner = THIS_MODULE, | |
92 | }, | |
93 | .probe = parisc_rtc_probe, | |
94 | .remove = __devexit_p(parisc_rtc_remove), | |
95 | }; | |
96 | ||
97 | static int __init parisc_rtc_init(void) | |
98 | { | |
99 | return platform_driver_register(&parisc_rtc_driver); | |
100 | } | |
101 | ||
102 | static void __exit parisc_rtc_fini(void) | |
103 | { | |
104 | platform_driver_unregister(&parisc_rtc_driver); | |
105 | } | |
106 | ||
107 | module_init(parisc_rtc_init); | |
108 | module_exit(parisc_rtc_fini); | |
109 | ||
110 | MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>"); | |
111 | MODULE_LICENSE("GPL"); | |
112 | MODULE_DESCRIPTION("HP PA-RISC RTC driver"); |