rtc: remove /sys/class/rtc-dev/*
This simplifies the /dev support by removing a superfluous class_device (the
/sys/class/rtc-dev stuff) and the class_interface that hooks it into the rtc
core. Accordingly, if it's configured then /dev 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".
[bunk@stusta.de: drivers/rtc/rtc-dev.c should #include "rtc-core.h"]
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: Adrian Bunk <bunk@stusta.de>
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 1b853c4..48eca80 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -71,7 +71,7 @@
will be called rtc-proc.
config RTC_INTF_DEV
- tristate "dev"
+ boolean "dev"
depends on RTC_CLASS
default RTC_CLASS
help
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index f9a3e01..4820dcc 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -11,9 +11,10 @@
obj-$(CONFIG_RTC_CLASS) += rtc-core.o
rtc-core-y := class.o interface.o
+rtc-core-$(CONFIG_RTC_INTF_DEV) += rtc-dev.o
+
obj-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
obj-$(CONFIG_RTC_INTF_PROC) += rtc-proc.o
-obj-$(CONFIG_RTC_INTF_DEV) += rtc-dev.o
obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 04aaa63..786406c 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -16,6 +16,9 @@
#include <linux/kdev_t.h>
#include <linux/idr.h>
+#include "rtc-core.h"
+
+
static DEFINE_IDR(rtc_idr);
static DEFINE_MUTEX(idr_lock);
struct class *rtc_class;
@@ -85,6 +88,8 @@
if (err)
goto exit_kfree;
+ rtc_dev_add_device(rtc);
+
dev_info(dev, "rtc core: registered %s as %s\n",
rtc->name, rtc->class_dev.class_id);
@@ -118,6 +123,7 @@
/* remove innards of this RTC, then disable it, before
* letting any rtc_class_open() users access it again
*/
+ rtc_dev_del_device(rtc);
class_device_unregister(&rtc->class_dev);
rtc->ops = NULL;
mutex_unlock(&rtc->ops_lock);
@@ -140,11 +146,13 @@
printk(KERN_ERR "%s: couldn't create class\n", __FILE__);
return PTR_ERR(rtc_class);
}
+ rtc_dev_init();
return 0;
}
static void __exit rtc_exit(void)
{
+ rtc_dev_exit();
class_destroy(rtc_class);
}
diff --git a/drivers/rtc/rtc-core.h b/drivers/rtc/rtc-core.h
new file mode 100644
index 0000000..c3c495e
--- /dev/null
+++ b/drivers/rtc/rtc-core.h
@@ -0,0 +1,15 @@
+#ifdef CONFIG_RTC_INTF_DEV
+
+extern void __init rtc_dev_init(void);
+extern void __exit rtc_dev_exit(void);
+extern void rtc_dev_add_device(struct rtc_device *rtc);
+extern void rtc_dev_del_device(struct rtc_device *rtc);
+
+#else
+
+#define rtc_dev_init() do{}while(0)
+#define rtc_dev_exit() do{}while(0)
+#define rtc_dev_add_device(r) do{}while(0)
+#define rtc_dev_del_device(r) do{}while(0)
+
+#endif
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 137330b..3fa6138 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -13,8 +13,8 @@
#include <linux/module.h>
#include <linux/rtc.h>
+#include "rtc-core.h"
-static struct class *rtc_dev_class;
static dev_t rtc_devt;
#define RTC_DEV_MAX 16 /* 16 RTCs should be enough for everyone... */
@@ -397,17 +397,18 @@
/* insertion/removal hooks */
-static int rtc_dev_add_device(struct class_device *class_dev,
- struct class_interface *class_intf)
+void rtc_dev_add_device(struct rtc_device *rtc)
{
- int err = 0;
- struct rtc_device *rtc = to_rtc_device(class_dev);
+ if (!rtc_devt)
+ return;
if (rtc->id >= RTC_DEV_MAX) {
- dev_err(class_dev->dev, "too many RTCs\n");
- return -EINVAL;
+ pr_debug("%s: too many RTC devices\n", rtc->name);
+ return;
}
+ rtc->class_dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);
+
mutex_init(&rtc->char_lock);
spin_lock_init(&rtc->irq_lock);
init_waitqueue_head(&rtc->irq_queue);
@@ -419,99 +420,32 @@
cdev_init(&rtc->char_dev, &rtc_dev_fops);
rtc->char_dev.owner = rtc->owner;
- if (cdev_add(&rtc->char_dev, MKDEV(MAJOR(rtc_devt), rtc->id), 1)) {
- dev_err(class_dev->dev,
- "failed to add char device %d:%d\n",
+ if (cdev_add(&rtc->char_dev, rtc->class_dev.devt, 1))
+ printk(KERN_WARNING "%s: failed to add char device %d:%d\n",
+ rtc->name, MAJOR(rtc_devt), rtc->id);
+ else
+ pr_debug("%s: dev (%d:%d)\n", rtc->name,
MAJOR(rtc_devt), rtc->id);
- return -ENODEV;
- }
-
- rtc->rtc_dev = class_device_create(rtc_dev_class, NULL,
- MKDEV(MAJOR(rtc_devt), rtc->id),
- class_dev->dev, "rtc%d", rtc->id);
- if (IS_ERR(rtc->rtc_dev)) {
- dev_err(class_dev->dev, "cannot create rtc_dev device\n");
- err = PTR_ERR(rtc->rtc_dev);
- goto err_cdev_del;
- }
-
- dev_dbg(class_dev->dev, "rtc intf: dev (%d:%d)\n",
- MAJOR(rtc->rtc_dev->devt),
- MINOR(rtc->rtc_dev->devt));
-
- return 0;
-
-err_cdev_del:
-
- cdev_del(&rtc->char_dev);
- return err;
}
-static void rtc_dev_remove_device(struct class_device *class_dev,
- struct class_interface *class_intf)
+void rtc_dev_del_device(struct rtc_device *rtc)
{
- struct rtc_device *rtc = to_rtc_device(class_dev);
-
- if (rtc->rtc_dev) {
- dev_dbg(class_dev->dev, "removing char %d:%d\n",
- MAJOR(rtc->rtc_dev->devt),
- MINOR(rtc->rtc_dev->devt));
-
- class_device_unregister(rtc->rtc_dev);
+ if (rtc->class_dev.devt)
cdev_del(&rtc->char_dev);
- }
}
-/* interface registration */
-
-static struct class_interface rtc_dev_interface = {
- .add = &rtc_dev_add_device,
- .remove = &rtc_dev_remove_device,
-};
-
-static int __init rtc_dev_init(void)
+void __init rtc_dev_init(void)
{
int err;
- rtc_dev_class = class_create(THIS_MODULE, "rtc-dev");
- if (IS_ERR(rtc_dev_class))
- return PTR_ERR(rtc_dev_class);
-
err = alloc_chrdev_region(&rtc_devt, 0, RTC_DEV_MAX, "rtc");
- if (err < 0) {
+ if (err < 0)
printk(KERN_ERR "%s: failed to allocate char dev region\n",
__FILE__);
- goto err_destroy_class;
- }
-
- err = rtc_interface_register(&rtc_dev_interface);
- if (err < 0) {
- printk(KERN_ERR "%s: failed to register the interface\n",
- __FILE__);
- goto err_unregister_chrdev;
- }
-
- return 0;
-
-err_unregister_chrdev:
- unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
-
-err_destroy_class:
- class_destroy(rtc_dev_class);
-
- return err;
}
-static void __exit rtc_dev_exit(void)
+void __exit rtc_dev_exit(void)
{
- class_interface_unregister(&rtc_dev_interface);
- class_destroy(rtc_dev_class);
- unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
+ if (rtc_devt)
+ unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
}
-
-subsys_initcall(rtc_dev_init);
-module_exit(rtc_dev_exit);
-
-MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
-MODULE_DESCRIPTION("RTC class dev interface");
-MODULE_LICENSE("GPL");
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 5e22d45..f662ae1 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -145,7 +145,6 @@
const struct rtc_class_ops *ops;
struct mutex ops_lock;
- struct class_device *rtc_dev;
struct cdev char_dev;
struct mutex char_lock;