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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); | |
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 | ||
49 | static const struct rtc_class_ops parisc_rtc_ops = { | |
50 | .read_time = parisc_get_time, | |
51 | .set_time = parisc_set_time, | |
52 | }; | |
53 | ||
54 | static 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 | ||
77 | static 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 | ||
87 | static 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 | ||
96 | static int __init parisc_rtc_init(void) | |
97 | { | |
98 | return platform_driver_register(&parisc_rtc_driver); | |
99 | } | |
100 | ||
101 | static void __exit parisc_rtc_fini(void) | |
102 | { | |
103 | platform_driver_unregister(&parisc_rtc_driver); | |
104 | } | |
105 | ||
106 | module_init(parisc_rtc_init); | |
107 | module_exit(parisc_rtc_fini); | |
108 | ||
109 | MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>"); | |
110 | MODULE_LICENSE("GPL"); | |
111 | MODULE_DESCRIPTION("HP PA-RISC RTC driver"); |