acpi: convert to use kobjects and sysfs.

- replace driver_dir_entry in acpi_device with struct kobject.
- register acpi with firmware subsystem on startup.
- register sub-subsystem.
- put namespace hierarchy under that.

drivers/acpi/Makefile

@@ -32,7 +32,7 @@ obj-$(CONFIG_ACPI_INTERPRETER)	+= osl.o utils.o \
 #
 # ACPI Bus and Device Drivers
 #
-obj-$(CONFIG_ACPI_BUS)		+= bus.o driverfs.o
+obj-$(CONFIG_ACPI_BUS)		+= bus.o
 obj-$(CONFIG_ACPI_AC) 		+= ac.o
 obj-$(CONFIG_ACPI_BATTERY)	+= battery.o
 obj-$(CONFIG_ACPI_BUTTON)	+= button.o

drivers/acpi/acpi_bus.h

@@ -27,7 +27,7 @@
 #define __ACPI_BUS_H__
 
 #include <linux/version.h>
-#include <linux/driverfs_fs.h>
+#include <linux/kobject.h>
 
 #include "include/acpi.h"
 
@@ -255,7 +255,7 @@ struct acpi_device {
 	struct acpi_device_ops	ops;
 	struct acpi_driver	*driver;
 	void			*driver_data;
-	struct driver_dir_entry	driverfs_dir;
+	struct kobject		kobj;
 };
 
 #define acpi_driver_data(d)	((d)->driver_data)
@@ -274,6 +274,7 @@ struct acpi_bus_event {
 	u32			data;
 };
 
+extern struct subsystem acpi_subsys;
 
 /*
  * External Functions

drivers/acpi/bus.c

@@ -675,6 +675,9 @@ acpi_bus_init (void)
 	return_VALUE(-ENODEV);
 }
 
+struct subsystem acpi_subsys = {
+	.kobj	= { .name = "acpi" },
+};
 
 static int __init acpi_init (void)
 {
@@ -693,6 +696,8 @@ static int __init acpi_init (void)
 		return -ENODEV;
 	}
 
+	firmware_register(&acpi_subsys);
+
 	result = acpi_bus_init();
 
 	if (!result) {

drivers/acpi/driverfs.c

-/*
- * driverfs.c - ACPI bindings for driverfs.
- *
- * Copyright (c) 2002 Patrick Mochel
- * Copyright (c) 2002 The Open Source Development Lab
- *
- */
-
-#include <linux/stat.h>
-#include <linux/init.h>
-#include <linux/driverfs_fs.h>
-
-#include "acpi_bus.h"
-
-static struct driver_dir_entry acpi_dir = {
-	.name		= "acpi",
-	.mode	= (S_IRWXU | S_IRUGO | S_IXUGO),
-};
- 
-/* driverfs ops for ACPI attribute files go here, when/if
- * there are ACPI attribute files. 
- * For now, we just have directory creation and removal.
- */
-
-void acpi_remove_dir(struct acpi_device * dev)
-{
-	if (dev)
-		driverfs_remove_dir(&dev->driverfs_dir);
-}
-
-int acpi_create_dir(struct acpi_device * dev)
-{
-	struct driver_dir_entry * parent;
-
-	parent = dev->parent ? &dev->parent->driverfs_dir : &acpi_dir;
-	dev->driverfs_dir.name = dev->pnp.bus_id;
-	dev->driverfs_dir.mode  = (S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO);
-	return driverfs_create_dir(&dev->driverfs_dir,parent);
-}
-
-static int __init acpi_driverfs_init(void)
-{
-	return driverfs_create_dir(&acpi_dir,NULL);
-}
-
-subsys_initcall(acpi_driverfs_init);

drivers/acpi/scan.c

@@ -25,20 +25,52 @@ extern struct acpi_device		*acpi_root;
 static LIST_HEAD(acpi_device_list);
 static spinlock_t acpi_device_lock = SPIN_LOCK_UNLOCKED;
 
-static int
-acpi_device_register (
-	struct acpi_device	*device,
-	struct acpi_device	*parent)
+static void acpi_device_release(struct kobject * kobj)
 {
-	return acpi_create_dir(device);
+	struct acpi_device * dev = container_of(kobj,struct acpi_device,kobj);
+	kfree(dev);
 }
 
+static struct subsystem acpi_namespace_subsys = {
+	.kobj		= { .name = "namespace" },
+	.parent		= &acpi_subsys,
+	.release	= acpi_device_release,
+};
+
+
+static void acpi_device_register(struct acpi_device * device, struct acpi_device * parent)
+{
+	/*
+	 * Linkage
+	 * -------
+	 * Link this device to its parent and siblings.
+	 */
+	INIT_LIST_HEAD(&device->children);
+	INIT_LIST_HEAD(&device->node);
+	INIT_LIST_HEAD(&device->g_list);
+
+	spin_lock(&acpi_device_lock);
+	if (device->parent) {
+		list_add_tail(&device->node, &device->parent->children);
+		list_add_tail(&device->g_list,&device->parent->g_list);
+	} else
+		list_add_tail(&device->g_list,&acpi_device_list);
+	spin_unlock(&acpi_device_lock);
+
+	kobject_init(&device->kobj);
+	strncpy(device->kobj.name,device->pnp.bus_id,KOBJ_NAME_LEN);
+	if (parent)
+		device->kobj.parent = &parent->kobj;
+	device->kobj.subsys = &acpi_namespace_subsys;
+	kobject_register(&device->kobj);
+}
 
 static int
 acpi_device_unregister (
-	struct acpi_device	*device)
+	struct acpi_device	*device, 
+	int			type)
 {
-	acpi_remove_dir(device);
+	kobject_unregister(&device->kobj);
 	return 0;
 }
 
@@ -443,16 +475,6 @@ acpi_bus_get_flags (
 	return_VALUE(0);
 }
 
-static int
-acpi_bus_remove (
-	struct acpi_device	*device, 
-	int			type)
-{
-	acpi_device_unregister(device);
-	kfree(device);
-	return 0;
-}
-
 static void acpi_device_get_busid(struct acpi_device * device, acpi_handle handle, int type)
 {
 	char			bus_id[5] = {'?',0};
@@ -621,28 +643,6 @@ void acpi_device_get_debug_info(struct acpi_device * device, acpi_handle handle,
 #endif /*CONFIG_ACPI_DEBUG*/
 }
 
-static void acpi_device_attach(struct acpi_device * device, struct acpi_device * parent)
-{
-	/*
-	 * Linkage
-	 * -------
-	 * Link this device to its parent and siblings.
-	 */
-	INIT_LIST_HEAD(&device->children);
-	INIT_LIST_HEAD(&device->node);
-	INIT_LIST_HEAD(&device->g_list);
-
-	spin_lock(&acpi_device_lock);
-	if (device->parent) {
-		list_add_tail(&device->node, &device->parent->children);
-		list_add_tail(&device->g_list,&device->parent->g_list);
-	} else
-		list_add_tail(&device->g_list,&acpi_device_list);
-	spin_unlock(&acpi_device_lock);
-
-	acpi_device_register(device, parent);
-}
-
 static int 
 acpi_bus_add (
 	struct acpi_device	**child,
@@ -741,7 +741,7 @@ acpi_bus_add (
 
 	acpi_device_get_debug_info(device,handle,type);
 
-	acpi_device_attach(device,parent);
+	acpi_device_register(device,parent);
 
 	/*
 	 * Bind _ADR-Based Devices
@@ -919,6 +919,8 @@ static int __init acpi_scan_init(void)
 	if (acpi_disabled)
 		return_VALUE(0);
 
+	subsystem_register(&acpi_namespace_subsys);
+
 	/*
 	 * Create the root device in the bus's device tree
 	 */
@@ -935,7 +937,7 @@ static int __init acpi_scan_init(void)
 		result = acpi_bus_scan(acpi_root);
 
 	if (result)
-		acpi_bus_remove(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
+		acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
 
  Done:
 	return_VALUE(result);

include/linux/device.h

@@ -437,6 +437,11 @@ extern int device_suspend(u32 state, u32 level);
 extern void device_resume(u32 level);
 extern void device_shutdown(void);
 
+
+/* drivrs/base/firmware.c */
+extern int firmware_register(struct subsystem *);
+extern void firmware_uregister(struct subsystem *);
+
 /* debugging and troubleshooting/diagnostic helpers. */
 #ifdef DEBUG
 #define dev_dbg(dev, format, arg...)		\