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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);