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/*
* 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");
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