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c5c3e192 AZ |
1 | /* |
2 | * RTC subsystem, sysfs interface | |
3 | * | |
4 | * Copyright (C) 2005 Tower Technologies | |
5 | * Author: Alessandro Zummo <a.zummo@towertech.it> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/rtc.h> | |
14 | ||
15 | /* device attributes */ | |
16 | ||
17 | static ssize_t rtc_sysfs_show_name(struct class_device *dev, char *buf) | |
18 | { | |
19 | return sprintf(buf, "%s\n", to_rtc_device(dev)->name); | |
20 | } | |
21 | static CLASS_DEVICE_ATTR(name, S_IRUGO, rtc_sysfs_show_name, NULL); | |
22 | ||
23 | static ssize_t rtc_sysfs_show_date(struct class_device *dev, char *buf) | |
24 | { | |
25 | ssize_t retval; | |
26 | struct rtc_time tm; | |
27 | ||
28 | retval = rtc_read_time(dev, &tm); | |
29 | if (retval == 0) { | |
30 | retval = sprintf(buf, "%04d-%02d-%02d\n", | |
31 | tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday); | |
32 | } | |
33 | ||
34 | return retval; | |
35 | } | |
36 | static CLASS_DEVICE_ATTR(date, S_IRUGO, rtc_sysfs_show_date, NULL); | |
37 | ||
38 | static ssize_t rtc_sysfs_show_time(struct class_device *dev, char *buf) | |
39 | { | |
40 | ssize_t retval; | |
41 | struct rtc_time tm; | |
42 | ||
43 | retval = rtc_read_time(dev, &tm); | |
44 | if (retval == 0) { | |
45 | retval = sprintf(buf, "%02d:%02d:%02d\n", | |
46 | tm.tm_hour, tm.tm_min, tm.tm_sec); | |
47 | } | |
48 | ||
49 | return retval; | |
50 | } | |
51 | static CLASS_DEVICE_ATTR(time, S_IRUGO, rtc_sysfs_show_time, NULL); | |
52 | ||
53 | static ssize_t rtc_sysfs_show_since_epoch(struct class_device *dev, char *buf) | |
54 | { | |
55 | ssize_t retval; | |
56 | struct rtc_time tm; | |
57 | ||
58 | retval = rtc_read_time(dev, &tm); | |
59 | if (retval == 0) { | |
60 | unsigned long time; | |
61 | rtc_tm_to_time(&tm, &time); | |
62 | retval = sprintf(buf, "%lu\n", time); | |
63 | } | |
64 | ||
65 | return retval; | |
66 | } | |
67 | static CLASS_DEVICE_ATTR(since_epoch, S_IRUGO, rtc_sysfs_show_since_epoch, NULL); | |
68 | ||
69 | static struct attribute *rtc_attrs[] = { | |
70 | &class_device_attr_name.attr, | |
71 | &class_device_attr_date.attr, | |
72 | &class_device_attr_time.attr, | |
73 | &class_device_attr_since_epoch.attr, | |
74 | NULL, | |
75 | }; | |
76 | ||
77 | static struct attribute_group rtc_attr_group = { | |
78 | .attrs = rtc_attrs, | |
79 | }; | |
80 | ||
81 | static int __devinit rtc_sysfs_add_device(struct class_device *class_dev, | |
82 | struct class_interface *class_intf) | |
83 | { | |
84 | int err; | |
85 | ||
86 | dev_info(class_dev->dev, "rtc intf: sysfs\n"); | |
87 | ||
88 | err = sysfs_create_group(&class_dev->kobj, &rtc_attr_group); | |
89 | if (err) | |
90 | dev_err(class_dev->dev, | |
91 | "failed to create sysfs attributes\n"); | |
92 | ||
93 | return err; | |
94 | } | |
95 | ||
96 | static void rtc_sysfs_remove_device(struct class_device *class_dev, | |
97 | struct class_interface *class_intf) | |
98 | { | |
99 | sysfs_remove_group(&class_dev->kobj, &rtc_attr_group); | |
100 | } | |
101 | ||
102 | /* interface registration */ | |
103 | ||
104 | static struct class_interface rtc_sysfs_interface = { | |
105 | .add = &rtc_sysfs_add_device, | |
106 | .remove = &rtc_sysfs_remove_device, | |
107 | }; | |
108 | ||
109 | static int __init rtc_sysfs_init(void) | |
110 | { | |
111 | return rtc_interface_register(&rtc_sysfs_interface); | |
112 | } | |
113 | ||
114 | static void __exit rtc_sysfs_exit(void) | |
115 | { | |
116 | class_interface_unregister(&rtc_sysfs_interface); | |
117 | } | |
118 | ||
818a8674 | 119 | subsys_init(rtc_sysfs_init); |
c5c3e192 AZ |
120 | module_exit(rtc_sysfs_exit); |
121 | ||
122 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
123 | MODULE_DESCRIPTION("RTC class sysfs interface"); | |
124 | MODULE_LICENSE("GPL"); |