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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>
This commit is contained in:
David Brownell 2007-05-08 00:33:27 -07:00 committed by Linus Torvalds
parent 1c710c896e
commit 5726fb2012
6 changed files with 46 additions and 89 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/rtc/Kconfig
View File

@ -71,7 +71,7 @@ config RTC_INTF_PROC
will be called rtc-proc.
config RTC_INTF_DEV
tristate "dev"
boolean "dev"
depends on RTC_CLASS
default RTC_CLASS
help

3
drivers/rtc/Makefile
View File

@ -11,9 +11,10 @@ obj-$(CONFIG_RTC_HCTOSYS) += hctosys.o
obj-$(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

8
drivers/rtc/class.c
View File

@ -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 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
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 @@ void rtc_device_unregister(struct rtc_device *rtc)
/* 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 @@ static int __init rtc_init(void)
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);
}

15
drivers/rtc/rtc-core.h Normal file
View File

@ -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

106
drivers/rtc/rtc-dev.c
View File

@ -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 @@ static const struct file_operations rtc_dev_fops = {
/* 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 @@ static int rtc_dev_add_device(struct class_device *class_dev,
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");

1
include/linux/rtc.h
View File

@ -145,7 +145,6 @@ struct rtc_device
const struct rtc_class_ops *ops;
struct mutex ops_lock;
struct class_device *rtc_dev;
struct cdev char_dev;
struct mutex char_lock;