/* * 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);} module_init(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");