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Commit c5c3e192 authored by Alessandro Zummo's avatar Alessandro Zummo Committed by Linus Torvalds
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[PATCH] RTC subsystem: sysfs interface 



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: default avatarAlessandro Zummo <a.zummo@towertech.it>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f7f3682f

drivers/rtc/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -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

drivers/rtc/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -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

drivers/rtc/rtc-sysfs.c

0 → 100644
+124 −0
Original line number Diff line number Diff line 
/*

 * 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");