/* * RTC subsystem, sysfs interface * * Copyright (C) 2005 Tower Technologies * Author: Alessandro Zummo <a.zummo@towertech.it> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/rtc.h> /* device attributes */ static ssize_t rtc_sysfs_show_name(struct class_device *dev, char *buf) { return sprintf(buf, "%s\n", to_rtc_device(dev)->name); } static CLASS_DEVICE_ATTR(name, S_IRUGO, rtc_sysfs_show_name, NULL); static ssize_t rtc_sysfs_show_date(struct class_device *dev, char *buf) { ssize_t retval; struct rtc_time tm; retval = rtc_read_time(dev, &tm); if (retval == 0) { retval = sprintf(buf, "%04d-%02d-%02d\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday); } return retval; } static CLASS_DEVICE_ATTR(date, S_IRUGO, rtc_sysfs_show_date, NULL); static ssize_t rtc_sysfs_show_time(struct class_device *dev, char *buf) { ssize_t retval; struct rtc_time tm; retval = rtc_read_time(dev, &tm); if (retval == 0) { retval = sprintf(buf, "%02d:%02d:%02d\n", tm.tm_hour, tm.tm_min, tm.tm_sec); } return retval; } static CLASS_DEVICE_ATTR(time, S_IRUGO, rtc_sysfs_show_time, NULL); static ssize_t rtc_sysfs_show_since_epoch(struct class_device *dev, char *buf) { ssize_t retval; struct rtc_time tm; retval = rtc_read_time(dev, &tm); if (retval == 0) { unsigned long time; rtc_tm_to_time(&tm, &time); retval = sprintf(buf, "%lu\n", time); } return retval; } static CLASS_DEVICE_ATTR(since_epoch, S_IRUGO, rtc_sysfs_show_since_epoch, NULL); static struct attribute *rtc_attrs[] = { &class_device_attr_name.attr, &class_device_attr_date.attr, &class_device_attr_time.attr, &class_device_attr_since_epoch.attr, NULL, }; static struct attribute_group rtc_attr_group = { .attrs = rtc_attrs, }; static int __devinit rtc_sysfs_add_device(struct class_device *class_dev, struct class_interface *class_intf) { int err; dev_info(class_dev->dev, "rtc intf: sysfs\n"); err = sysfs_create_group(&class_dev->kobj, &rtc_attr_group); if (err) dev_err(class_dev->dev, "failed to create sysfs attributes\n"); return err; } static void rtc_sysfs_remove_device(struct class_device *class_dev, struct class_interface *class_intf) { sysfs_remove_group(&class_dev->kobj, &rtc_attr_group); } /* interface registration */ static struct class_interface rtc_sysfs_interface = { .add = &rtc_sysfs_add_device, .remove = &rtc_sysfs_remove_device, }; static int __init rtc_sysfs_init(void) { return rtc_interface_register(&rtc_sysfs_interface); } static void __exit rtc_sysfs_exit(void) { class_interface_unregister(&rtc_sysfs_interface); } subsys_initcall(rtc_sysfs_init); module_exit(rtc_sysfs_exit); MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); MODULE_DESCRIPTION("RTC class sysfs interface"); MODULE_LICENSE("GPL");