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/*

 * class.c - basic device class management

 *

 * Copyright (c) 2002-3 Patrick Mochel

 * Copyright (c) 2002-3 Open Source Development Labs

 * Copyright (c) 2003 Greg Kroah-Hartman

 * Copyright (c) 2003 IBM Corp.

 *

 * This file is released under the GPLv2

 *

 */

#undef DEBUG

#include <linuxcomp.h>

#include <linux/device.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/string.h>

#include "base.h"

#define to_class_attr(_attr) container_of(_attr,struct class_attribute,attr)

#define to_class(obj) container_of(obj,struct class,subsys.kset.kobj)

static ssize_t

class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)

{

	struct class_attribute * class_attr = to_class_attr(attr);

	struct class * dc = to_class(kobj);

	ssize_t ret = 0;

	if (class_attr->show)

		ret = class_attr->show(dc,buf);

	return ret;

}

static ssize_t

class_attr_store(struct kobject * kobj, struct attribute * attr,

		 const char * buf, size_t count)

{

	struct class_attribute * class_attr = to_class_attr(attr);

	struct class * dc = to_class(kobj);

	ssize_t ret = 0;

	if (class_attr->store)

		ret = class_attr->store(dc,buf,count);

	return ret;

}

static struct sysfs_ops class_sysfs_ops = {

	.show	= class_attr_show,

	.store	= class_attr_store,

};

static struct kobj_type ktype_class = {

	.sysfs_ops	= &class_sysfs_ops,

};

/* Hotplug events for classes go to the class_obj subsys */

static decl_subsys(class,&ktype_class,NULL);

int class_create_file(struct class * cls, const struct class_attribute * attr)

{

	int error;

	if (cls) {

		error = 0;//sysfs_create_file(&cls->subsys.kset.kobj,&attr->attr);

	} else

		error = -EINVAL;

	return error;

}

void class_remove_file(struct class * cls, const struct class_attribute * attr)

{

	//if (cls)

	//	sysfs_remove_file(&cls->subsys.kset.kobj,&attr->attr);

}

struct class * class_get(struct class * cls)

{

	if (cls)

		return container_of(subsys_get(&cls->subsys),struct class,subsys);

	return NULL;

}

void class_put(struct class * cls)

{

	subsys_put(&cls->subsys);

}

int class_register(struct class * cls)

{

	pr_debug("device class '%s': registering\n",cls->name);

	INIT_LIST_HEAD(&cls->children);

	INIT_LIST_HEAD(&cls->interfaces);

	kobject_set_name(&cls->subsys.kset.kobj,cls->name);

	subsys_set_kset(cls,class_subsys);

	subsystem_register(&cls->subsys);

	return 0;

}

void class_unregister(struct class * cls)

{

	pr_debug("device class '%s': unregistering\n",cls->name);

	subsystem_unregister(&cls->subsys);

}

/* Class Device Stuff */

int class_device_create_file(struct class_device * class_dev,

			     const struct class_device_attribute * attr)

{

	int error = -EINVAL;

	if (class_dev)

		error = 0;//sysfs_create_file(&class_dev->kobj, &attr->attr);

	return error;

}

void class_device_remove_file(struct class_device * class_dev,

			      const struct class_device_attribute * attr)

{

	//if (class_dev)

	//	sysfs_remove_file(&class_dev->kobj, &attr->attr);

}

static int class_device_dev_link(struct class_device * class_dev)

{

	//if (class_dev->dev)

	//	return sysfs_create_link(&class_dev->kobj,

	//				 &class_dev->dev->kobj, "device");

	return 0;

}

static void class_device_dev_unlink(struct class_device * class_dev)

{

	//if (class_dev->dev)

	//	sysfs_remove_link(&class_dev->kobj, "device");

}

static int class_device_driver_link(struct class_device * class_dev)

{

	//if ((class_dev->dev) && (class_dev->dev->driver))

	//	return sysfs_create_link(&class_dev->kobj,

	//				 &class_dev->dev->driver->kobj, "driver");

	return 0;

}

static void class_device_driver_unlink(struct class_device * class_dev)

{

	//if ((class_dev->dev) && (class_dev->dev->driver))

	//	sysfs_remove_link(&class_dev->kobj, "driver");

}

static ssize_t

class_device_attr_show(struct kobject * kobj, struct attribute * attr,

		       char * buf)

{

	struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);

	struct class_device * cd = to_class_dev(kobj);

	ssize_t ret = 0;

	if (class_dev_attr->show)

		ret = class_dev_attr->show(cd,buf);

	return ret;

}

static ssize_t

class_device_attr_store(struct kobject * kobj, struct attribute * attr,

			const char * buf, size_t count)

{

	struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);

	struct class_device * cd = to_class_dev(kobj);

	ssize_t ret = 0;

	if (class_dev_attr->store)

		ret = class_dev_attr->store(cd,buf,count);

	return ret;

}

static struct sysfs_ops class_dev_sysfs_ops = {

	.show	= class_device_attr_show,

	.store	= class_device_attr_store,

};

static void class_dev_release(struct kobject * kobj)

{

	struct class_device *cd = to_class_dev(kobj);

	struct class * cls = cd->class;

	pr_debug("device class '%s': release.\n",cd->class_id);

	if (cls->release)

		cls->release(cd);

	else {

		printk(KERN_ERR "Device class '%s' does not have a release() function, "

			"it is broken and must be fixed.\n",

			cd->class_id);

		WARN_ON(1);

	}

}

static struct kobj_type ktype_class_device = {

	.sysfs_ops	= &class_dev_sysfs_ops,

	.release	= class_dev_release,

};

static int class_hotplug_filter(struct kset *kset, struct kobject *kobj)

{

	struct kobj_type *ktype = get_ktype(kobj);

	if (ktype == &ktype_class_device) {

		struct class_device *class_dev = to_class_dev(kobj);

		if (class_dev->class)

			return 1;

	}

	return 0;

}

static char *class_hotplug_name(struct kset *kset, struct kobject *kobj)

{

	struct class_device *class_dev = to_class_dev(kobj);

	return class_dev->class->name;

}

static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp,

			 int num_envp, char *buffer, int buffer_size)

{

	struct class_device *class_dev = to_class_dev(kobj);

	int retval = 0;

	pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);

	if (class_dev->class->hotplug) {

		/* have the bus specific function add its stuff */

		retval = class_dev->class->hotplug (class_dev, envp, num_envp,

						    buffer, buffer_size);

			if (retval) {

			pr_debug ("%s - hotplug() returned %d\n",

				  __FUNCTION__, retval);

		}

	}

	return retval;

}

static struct kset_hotplug_ops class_hotplug_ops = {

	.filter =	class_hotplug_filter,

	.name =		class_hotplug_name,

	.hotplug =	class_hotplug,

};

static decl_subsys(class_obj, &ktype_class_device, &class_hotplug_ops);

void class_device_initialize(struct class_device *class_dev)

{

	kobj_set_kset_s(class_dev, class_obj_subsys);

	kobject_init(&class_dev->kobj);

	INIT_LIST_HEAD(&class_dev->node);

}

int class_device_add(struct class_device *class_dev)

{

	struct class * parent;

	struct class_interface * class_intf;

	struct list_head * entry;

	int error;

	class_dev = class_device_get(class_dev);

	if (!class_dev || !strlen(class_dev->class_id))

		return -EINVAL;

	parent = class_get(class_dev->class);

	pr_debug("CLASS: registering class device: ID = '%s'\n",

		 class_dev->class_id);

	/* first, register with generic layer. */

	kobject_set_name(&class_dev->kobj, class_dev->class_id);

	if (parent)

		class_dev->kobj.parent = &parent->subsys.kset.kobj;

	if ((error = kobject_add(&class_dev->kobj)))

		goto register_done;

	/* now take care of our own registration */

	if (parent) {

		//down_write(&parent->subsys.rwsem);

		list_add_tail(&class_dev->node, &parent->children);

		list_for_each(entry, &parent->interfaces) {

			class_intf = container_of(entry, struct class_interface, node);

			if (class_intf->add)

				class_intf->add(class_dev);

		}

		//up_write(&parent->subsys.rwsem);

	}

	class_device_dev_link(class_dev);

	class_device_driver_link(class_dev);

 register_done:

	if (error && parent)

		class_put(parent);

	class_device_put(class_dev);

	return error;

}

int class_device_register(struct class_device *class_dev)

{

	class_device_initialize(class_dev);

	return class_device_add(class_dev);

}

void class_device_del(struct class_device *class_dev)

{

	struct class * parent = class_dev->class;

	struct class_interface * class_intf;

	struct list_head * entry;

	if (parent) {

		//down_write(&parent->subsys.rwsem);

		list_del_init(&class_dev->node);

		list_for_each(entry, &parent->interfaces) {

			class_intf = container_of(entry, struct class_interface, node);

			if (class_intf->remove)

				class_intf->remove(class_dev);

		}

		//up_write(&parent->subsys.rwsem);

	}

	class_device_dev_unlink(class_dev);

	class_device_driver_unlink(class_dev);

	kobject_del(&class_dev->kobj);

	if (parent)

		class_put(parent);

}

void class_device_unregister(struct class_device *class_dev)

{

	pr_debug("CLASS: Unregistering class device. ID = '%s'\n",

		 class_dev->class_id);

	class_device_del(class_dev);

	class_device_put(class_dev);

}

int class_device_rename(struct class_device *class_dev, char *new_name)

{

	class_dev = class_device_get(class_dev);

	if (!class_dev)

		return -EINVAL;

	pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id,

		 new_name);

	strncpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);

	kobject_rename(&class_dev->kobj, new_name);

	class_device_put(class_dev);

	return 0;

}

struct class_device * class_device_get(struct class_device *class_dev)

{

	if (class_dev)

		return to_class_dev(kobject_get(&class_dev->kobj));

	return NULL;

}

void class_device_put(struct class_device *class_dev)

{

	kobject_put(&class_dev->kobj);

}

int class_interface_register(struct class_interface *class_intf)

{

	struct class * parent;

	struct class_device * class_dev;

	struct list_head * entry;

	if (!class_intf || !class_intf->class)

		return -ENODEV;

	parent = class_get(class_intf->class);

	if (!parent)

		return -EINVAL;

	//down_write(&parent->subsys.rwsem);

	list_add_tail(&class_intf->node, &parent->interfaces);

	if (class_intf->add) {

		list_for_each(entry, &parent->children) {

			class_dev = container_of(entry, struct class_device, node);

			class_intf->add(class_dev);

		}

	}

	//up_write(&parent->subsys.rwsem);

	return 0;

}

void class_interface_unregister(struct class_interface *class_intf)

{

	struct class * parent = class_intf->class;

	struct list_head * entry;

	if (!parent)

		return;

	//down_write(&parent->subsys.rwsem);

	list_del_init(&class_intf->node);

	if (class_intf->remove) {

		list_for_each(entry, &parent->children) {

			struct class_device *class_dev = container_of(entry, struct class_device, node);

			class_intf->remove(class_dev);

		}

	}

	//up_write(&parent->subsys.rwsem);

	class_put(parent);

}

int __init classes_init(void)

{

	int retval;

	retval = subsystem_register(&class_subsys);

	if (retval)

		return retval;

	/* ick, this is ugly, the things we go through to keep from showing up

	 * in sysfs... */

	subsystem_init(&class_obj_subsys);

	if (!class_obj_subsys.kset.subsys)

			class_obj_subsys.kset.subsys = &class_obj_subsys;

	return 0;

}

EXPORT_SYMBOL(class_create_file);

EXPORT_SYMBOL(class_remove_file);

EXPORT_SYMBOL(class_register);

EXPORT_SYMBOL(class_unregister);

EXPORT_SYMBOL(class_get);

EXPORT_SYMBOL(class_put);

EXPORT_SYMBOL(class_device_register);

EXPORT_SYMBOL(class_device_unregister);

EXPORT_SYMBOL(class_device_initialize);

EXPORT_SYMBOL(class_device_add);

EXPORT_SYMBOL(class_device_del);

EXPORT_SYMBOL(class_device_get);

EXPORT_SYMBOL(class_device_put);

EXPORT_SYMBOL(class_device_create_file);

EXPORT_SYMBOL(class_device_remove_file);

EXPORT_SYMBOL(class_interface_register);

EXPORT_SYMBOL(class_interface_unregister);