Messages in this thread Patch in this message | | | Date | Tue, 20 Dec 2005 21:47:14 +0100 | From | Alessandro Zummo <> | Subject | [RFC][PATCH 3/6] 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> -- drivers/rtc/Kconfig | 11 +++++ drivers/rtc/Makefile | 1 drivers/rtc/rtc-sysfs.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 113 insertions(+)
--- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-nslu2/drivers/rtc/rtc-sysfs.c 2005-12-20 19:39:03.000000000 +0100 @@ -0,0 +1,101 @@ +/* + hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring + + This file defines the sysfs class "hwmon", for use by sensors drivers. + + Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. +*/ + +#include <linux/module.h> +#include <linux/device.h> +#include <linux/rtc.h> + +/* device attributes */ + +static ssize_t rtc_sysfs_show_date(struct class_device *dev, char *buf) +{ + struct rtc_time tm; + + if (rtc_read_time(dev, &tm) == 0) { + return sprintf(buf, + "%04d-%02d-%02d\n", + tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday); + } + return 0; +} +static CLASS_DEVICE_ATTR(date, 0666, rtc_sysfs_show_date, NULL); + +static ssize_t rtc_sysfs_show_time(struct class_device *dev, char *buf) +{ + struct rtc_time tm; + + if (rtc_read_time(dev, &tm) == 0) { + return sprintf(buf, + "%02d:%02d:%02d\n", + tm.tm_hour, tm.tm_min, tm.tm_sec); + } + return 0; +} +static CLASS_DEVICE_ATTR(time, 0666, rtc_sysfs_show_time, NULL); + +static ssize_t rtc_sysfs_show_since_epoch(struct class_device *dev, char *buf) +{ + unsigned long time; + struct rtc_time tm; + + if (rtc_read_time(dev, &tm) == 0) { + rtc_tm_to_time(&tm, &time); + + return sprintf(buf, "%lu\n", time); + } + return 0; +} +static CLASS_DEVICE_ATTR(since_epoch, 0666, rtc_sysfs_show_since_epoch, NULL); + +/* insertion/removal hooks */ + +static int __devinit rtc_sysfs_add_device(struct class_device *class_dev, + struct class_interface *class_intf) +{ + class_device_create_file(class_dev, &class_device_attr_date); + class_device_create_file(class_dev, &class_device_attr_time); + class_device_create_file(class_dev, &class_device_attr_since_epoch); + dev_info(class_dev->dev, "rtc intf: sysfs\n"); + return 0; +} + +static void rtc_sysfs_remove_device(struct class_device *class_dev, + struct class_interface *class_intf) +{ + class_device_remove_file(class_dev, &class_device_attr_date); + class_device_remove_file(class_dev, &class_device_attr_time); + class_device_remove_file(class_dev, &class_device_attr_since_epoch); +} + +/* interface registration */ + +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"); --- linux-nslu2.orig/drivers/rtc/Kconfig 2005-12-20 19:37:24.000000000 +0100 +++ linux-nslu2/drivers/rtc/Kconfig 2005-12-20 19:52:07.000000000 +0100 @@ -19,6 +19,17 @@ config RTC_CLASS 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 --- linux-nslu2.orig/drivers/rtc/Makefile 2005-12-20 19:35:13.000000000 +0100 +++ linux-nslu2/drivers/rtc/Makefile 2005-12-20 19:51:54.000000000 +0100 @@ -6,3 +6,4 @@ obj-y += utils.o obj-$(CONFIG_RTC_CLASS) += rtc-core.o rtc-core-y := class.o intf.o rtc-core-objs := $(rtc-core-y) +obj-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
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