rtc: simplified rtc sysfs attribute handling
This simplifies the RTC sysfs support by removing the class_interface that
hooks it into the rtc core. If it's configured, then sysfs support is now
part of the RTC core, and is never a separate module.
It's another step towards being able to remove "struct class_device".
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-By: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 48eca80..d738725 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -48,7 +48,7 @@
depends on RTC_CLASS
config RTC_INTF_SYSFS
- tristate "sysfs"
+ boolean "sysfs"
depends on RTC_CLASS && SYSFS
default RTC_CLASS
help
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 4820dcc..37bb9ce 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -12,8 +12,8 @@
rtc-core-y := class.o interface.o
rtc-core-$(CONFIG_RTC_INTF_DEV) += rtc-dev.o
+rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
-obj-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
obj-$(CONFIG_RTC_INTF_PROC) += rtc-proc.o
obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 786406c..5845e6e 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -89,6 +89,7 @@
goto exit_kfree;
rtc_dev_add_device(rtc);
+ rtc_sysfs_add_device(rtc);
dev_info(dev, "rtc core: registered %s as %s\n",
rtc->name, rtc->class_dev.class_id);
@@ -123,6 +124,7 @@
/* remove innards of this RTC, then disable it, before
* letting any rtc_class_open() users access it again
*/
+ rtc_sysfs_del_device(rtc);
rtc_dev_del_device(rtc);
class_device_unregister(&rtc->class_dev);
rtc->ops = NULL;
@@ -147,6 +149,7 @@
return PTR_ERR(rtc_class);
}
rtc_dev_init();
+ rtc_sysfs_init(rtc_class);
return 0;
}
diff --git a/drivers/rtc/rtc-core.h b/drivers/rtc/rtc-core.h
index c989142..30bcd14 100644
--- a/drivers/rtc/rtc-core.h
+++ b/drivers/rtc/rtc-core.h
@@ -15,3 +15,17 @@
#define rtc_dev_del_device(r) do{}while(0)
#endif
+
+#ifdef CONFIG_RTC_INTF_SYSFS
+
+extern void __init rtc_sysfs_init(struct class *);
+extern void rtc_sysfs_add_device(struct rtc_device *rtc);
+extern void rtc_sysfs_del_device(struct rtc_device *rtc);
+
+#else
+
+#define rtc_sysfs_init(c) do{}while(0)
+#define rtc_sysfs_add_device(r) do{}while(0)
+#define rtc_sysfs_del_device(r) do{}while(0)
+
+#endif
diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
index 97444b4..1c2fa0c 100644
--- a/drivers/rtc/rtc-sysfs.c
+++ b/drivers/rtc/rtc-sysfs.c
@@ -21,7 +21,6 @@
{
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)
{
@@ -36,7 +35,6 @@
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)
{
@@ -51,7 +49,6 @@
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)
{
@@ -67,21 +64,15 @@
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 class_device_attribute rtc_attrs[] = {
+ __ATTR(name, S_IRUGO, rtc_sysfs_show_name, NULL),
+ __ATTR(date, S_IRUGO, rtc_sysfs_show_date, NULL),
+ __ATTR(time, S_IRUGO, rtc_sysfs_show_time, NULL),
+ __ATTR(since_epoch, S_IRUGO, rtc_sysfs_show_since_epoch, NULL),
+ { },
};
-static struct attribute_group rtc_attr_group = {
- .attrs = rtc_attrs,
-};
-
-
static ssize_t
rtc_sysfs_show_wakealarm(struct class_device *dev, char *buf)
{
@@ -157,71 +148,39 @@
* suspend-to-disk. So: no attribute unless that side effect is possible.
* (Userspace may disable that mechanism later.)
*/
-static inline int rtc_does_wakealarm(struct class_device *class_dev)
+static inline int rtc_does_wakealarm(struct rtc_device *rtc)
{
- struct rtc_device *rtc;
-
- if (!device_can_wakeup(class_dev->dev))
+ if (!device_can_wakeup(rtc->class_dev.dev))
return 0;
- rtc = to_rtc_device(class_dev);
return rtc->ops->set_alarm != NULL;
}
-static int rtc_sysfs_add_device(struct class_device *class_dev,
- struct class_interface *class_intf)
+void rtc_sysfs_add_device(struct rtc_device *rtc)
{
int err;
- dev_dbg(class_dev->dev, "rtc intf: sysfs\n");
+ /* not all RTCs support both alarms and wakeup */
+ if (!rtc_does_wakealarm(rtc))
+ return;
- err = sysfs_create_group(&class_dev->kobj, &rtc_attr_group);
- if (err)
- dev_err(class_dev->dev, "failed to create %s\n",
- "sysfs attributes");
- else if (rtc_does_wakealarm(class_dev)) {
- /* not all RTCs support both alarms and wakeup */
- err = class_device_create_file(class_dev,
- &class_device_attr_wakealarm);
- if (err) {
- dev_err(class_dev->dev, "failed to create %s\n",
- "alarm attribute");
- sysfs_remove_group(&class_dev->kobj, &rtc_attr_group);
- }
- }
-
- return err;
-}
-
-static void rtc_sysfs_remove_device(struct class_device *class_dev,
- struct class_interface *class_intf)
-{
- if (rtc_does_wakealarm(class_dev))
- class_device_remove_file(class_dev,
+ err = class_device_create_file(&rtc->class_dev,
&class_device_attr_wakealarm);
- sysfs_remove_group(&class_dev->kobj, &rtc_attr_group);
+ if (err)
+ dev_err(rtc->class_dev.dev, "failed to create "
+ "alarm attribute, %d",
+ err);
}
-/* 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)
+void rtc_sysfs_del_device(struct rtc_device *rtc)
{
- return rtc_interface_register(&rtc_sysfs_interface);
+ /* REVISIT did we add it successfully? */
+ if (rtc_does_wakealarm(rtc))
+ class_device_remove_file(&rtc->class_dev,
+ &class_device_attr_wakealarm);
}
-static void __exit rtc_sysfs_exit(void)
+void __init rtc_sysfs_init(struct class *rtc_class)
{
- class_interface_unregister(&rtc_sysfs_interface);
+ rtc_class->class_dev_attrs = rtc_attrs;
}
-
-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");