c5c3e19225
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>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* RTC subsystem, sysfs interface
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*
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* Copyright (C) 2005 Tower Technologies
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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/* device attributes */
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static ssize_t rtc_sysfs_show_name(struct class_device *dev, char *buf)
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{
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return sprintf(buf, "%s\n", to_rtc_device(dev)->name);
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}
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static CLASS_DEVICE_ATTR(name, S_IRUGO, rtc_sysfs_show_name, NULL);
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static ssize_t rtc_sysfs_show_date(struct class_device *dev, char *buf)
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{
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ssize_t retval;
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struct rtc_time tm;
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retval = rtc_read_time(dev, &tm);
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if (retval == 0) {
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retval = sprintf(buf, "%04d-%02d-%02d\n",
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tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
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}
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return retval;
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}
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static CLASS_DEVICE_ATTR(date, S_IRUGO, rtc_sysfs_show_date, NULL);
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static ssize_t rtc_sysfs_show_time(struct class_device *dev, char *buf)
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{
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ssize_t retval;
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struct rtc_time tm;
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retval = rtc_read_time(dev, &tm);
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if (retval == 0) {
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retval = sprintf(buf, "%02d:%02d:%02d\n",
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tm.tm_hour, tm.tm_min, tm.tm_sec);
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}
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return retval;
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}
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static CLASS_DEVICE_ATTR(time, S_IRUGO, rtc_sysfs_show_time, NULL);
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static ssize_t rtc_sysfs_show_since_epoch(struct class_device *dev, char *buf)
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{
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ssize_t retval;
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struct rtc_time tm;
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retval = rtc_read_time(dev, &tm);
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if (retval == 0) {
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unsigned long time;
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rtc_tm_to_time(&tm, &time);
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retval = sprintf(buf, "%lu\n", time);
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}
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return retval;
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}
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static CLASS_DEVICE_ATTR(since_epoch, S_IRUGO, rtc_sysfs_show_since_epoch, NULL);
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static struct attribute *rtc_attrs[] = {
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&class_device_attr_name.attr,
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&class_device_attr_date.attr,
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&class_device_attr_time.attr,
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&class_device_attr_since_epoch.attr,
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NULL,
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};
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static struct attribute_group rtc_attr_group = {
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.attrs = rtc_attrs,
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};
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static int __devinit rtc_sysfs_add_device(struct class_device *class_dev,
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struct class_interface *class_intf)
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{
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int err;
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dev_info(class_dev->dev, "rtc intf: sysfs\n");
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err = sysfs_create_group(&class_dev->kobj, &rtc_attr_group);
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if (err)
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dev_err(class_dev->dev,
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"failed to create sysfs attributes\n");
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return err;
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}
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static void rtc_sysfs_remove_device(struct class_device *class_dev,
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struct class_interface *class_intf)
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{
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sysfs_remove_group(&class_dev->kobj, &rtc_attr_group);
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}
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/* interface registration */
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static struct class_interface rtc_sysfs_interface = {
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.add = &rtc_sysfs_add_device,
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.remove = &rtc_sysfs_remove_device,
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};
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static int __init rtc_sysfs_init(void)
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{
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return rtc_interface_register(&rtc_sysfs_interface);
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}
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static void __exit rtc_sysfs_exit(void)
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{
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class_interface_unregister(&rtc_sysfs_interface);
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}
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module_init(rtc_sysfs_init);
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module_exit(rtc_sysfs_exit);
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("RTC class sysfs interface");
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MODULE_LICENSE("GPL");
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