| Alessandro Zummo | c5c3e19 | 2006-03-27 01:16:39 -0800 | [diff] [blame] | 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 | |
| 119 | module_init(rtc_sysfs_init); |
| 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"); |