125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
|
|
* 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 rtc_sysfs_add_device(struct class_device *class_dev,
|
|
struct class_interface *class_intf)
|
|
{
|
|
int err;
|
|
|
|
dev_dbg(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");
|