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[PATCH] RTC subsystem: sysfs interface

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This patch adds the sysfs interface to the RTC subsystem.

Each RTC client will have his own entry under /sys/classs/rtc/rtcN .

Within this entry some attributes are exported by the subsystem, like date and
time.

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alessandro Zummo 2006-03-27 01:16:39 -08:00 committed by Linus Torvalds
parent f7f3682fb2
commit c5c3e19225
3 changed files with 138 additions and 0 deletions
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11
drivers/rtc/Kconfig
View file

@ -40,6 +40,17 @@ config RTC_HCTOSYS_DEVICE
comment "RTC interfaces"
depends on RTC_CLASS
config RTC_INTF_SYSFS
tristate "sysfs"
depends on RTC_CLASS && SYSFS
default RTC_CLASS
help
Say yes here if you want to use your RTC using the sysfs
interface, /sys/class/rtc/rtcX .
This driver can also be built as a module. If so, the module
will be called rtc-sysfs.
comment "RTC drivers"
depends on RTC_CLASS

3
drivers/rtc/Makefile
View file

@ -6,3 +6,6 @@ obj-$(CONFIG_RTC_LIB) += rtc-lib.o
obj-$(CONFIG_RTC_HCTOSYS) += hctosys.o
obj-$(CONFIG_RTC_CLASS) += rtc-core.o
rtc-core-y := class.o interface.o
obj-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o

124
drivers/rtc/rtc-sysfs.c Normal file
View file

@ -0,0 +1,124 @@
/*
* 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");