Driver-Core: extend devnode callbacks to provide permissions

[deliverable/linux.git] / drivers / base / core.c

/*
 * drivers/base/core.c - core driver model code (device registration, etc)
 *
 * Copyright (c) 2002-3 Patrick Mochel
 * Copyright (c) 2002-3 Open Source Development Labs
 * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de>
 * Copyright (c) 2006 Novell, Inc.
 *
 * This file is released under the GPLv2
 *
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/kdev_t.h>
#include <linux/notifier.h>
#include <linux/genhd.h>
#include <linux/kallsyms.h>
#include <linux/semaphore.h>
#include <linux/mutex.h>
#include <linux/async.h>

#include "base.h"
#include "power/power.h"

int (*platform_notify)(struct device *dev) = NULL;
int (*platform_notify_remove)(struct device *dev) = NULL;
static struct kobject *dev_kobj;
struct kobject *sysfs_dev_char_kobj;
struct kobject *sysfs_dev_block_kobj;

#ifdef CONFIG_BLOCK
static inline int device_is_not_partition(struct device *dev)
{
        return !(dev->type == &part_type);
}
#else
static inline int device_is_not_partition(struct device *dev)
{
        return 1;
}
#endif

/**
 * dev_driver_string - Return a device's driver name, if at all possible
 * @dev: struct device to get the name of
 *
 * Will return the device's driver's name if it is bound to a device.  If
 * the device is not bound to a device, it will return the name of the bus
 * it is attached to.  If it is not attached to a bus either, an empty
 * string will be returned.
 */
const char *dev_driver_string(const struct device *dev)
{
        return dev->driver ? dev->driver->name :
                        (dev->bus ? dev->bus->name :
                        (dev->class ? dev->class->name : ""));
}
EXPORT_SYMBOL(dev_driver_string);

#define to_dev(obj) container_of(obj, struct device, kobj)
#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)

static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
                             char *buf)
{
        struct device_attribute *dev_attr = to_dev_attr(attr);
        struct device *dev = to_dev(kobj);
        ssize_t ret = -EIO;

        if (dev_attr->show)
                ret = dev_attr->show(dev, dev_attr, buf);
        if (ret >= (ssize_t)PAGE_SIZE) {
                print_symbol("dev_attr_show: %s returned bad count\n",
                                (unsigned long)dev_attr->show);
        }
        return ret;
}

static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr,
                              const char *buf, size_t count)
{
        struct device_attribute *dev_attr = to_dev_attr(attr);
        struct device *dev = to_dev(kobj);
        ssize_t ret = -EIO;

        if (dev_attr->store)
                ret = dev_attr->store(dev, dev_attr, buf, count);
        return ret;
}

static struct sysfs_ops dev_sysfs_ops = {
        .show   = dev_attr_show,
        .store  = dev_attr_store,
};


/**
 *      device_release - free device structure.
 *      @kobj:  device's kobject.
 *
 *      This is called once the reference count for the object
 *      reaches 0. We forward the call to the device's release
 *      method, which should handle actually freeing the structure.
 */
static void device_release(struct kobject *kobj)
{
        struct device *dev = to_dev(kobj);
        struct device_private *p = dev->p;

        if (dev->release)
                dev->release(dev);
        else if (dev->type && dev->type->release)
                dev->type->release(dev);
        else if (dev->class && dev->class->dev_release)
                dev->class->dev_release(dev);
        else
                WARN(1, KERN_ERR "Device '%s' does not have a release() "
                        "function, it is broken and must be fixed.\n",
                        dev_name(dev));
        kfree(p);
}

static struct kobj_type device_ktype = {
        .release        = device_release,
        .sysfs_ops      = &dev_sysfs_ops,
};


static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
{
        struct kobj_type *ktype = get_ktype(kobj);

        if (ktype == &device_ktype) {
                struct device *dev = to_dev(kobj);
                if (dev->bus)
                        return 1;
                if (dev->class)
                        return 1;
        }
        return 0;
}

static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
{
        struct device *dev = to_dev(kobj);

        if (dev->bus)
                return dev->bus->name;
        if (dev->class)
                return dev->class->name;
        return NULL;
}

static int dev_uevent(struct kset *kset, struct kobject *kobj,
                      struct kobj_uevent_env *env)
{
        struct device *dev = to_dev(kobj);
        int retval = 0;

        /* add device node properties if present */
        if (MAJOR(dev->devt)) {
                const char *tmp;
                const char *name;
                mode_t mode = 0;

                add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
                add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
                name = device_get_devnode(dev, &mode, &tmp);
                if (name) {
                        add_uevent_var(env, "DEVNAME=%s", name);
                        kfree(tmp);
                        if (mode)
                                add_uevent_var(env, "DEVMODE=%#o", mode & 0777);
                }
        }

        if (dev->type && dev->type->name)
                add_uevent_var(env, "DEVTYPE=%s", dev->type->name);

        if (dev->driver)
                add_uevent_var(env, "DRIVER=%s", dev->driver->name);

#ifdef CONFIG_SYSFS_DEPRECATED
        if (dev->class) {
                struct device *parent = dev->parent;

                /* find first bus device in parent chain */
                while (parent && !parent->bus)
                        parent = parent->parent;
                if (parent && parent->bus) {
                        const char *path;

                        path = kobject_get_path(&parent->kobj, GFP_KERNEL);
                        if (path) {
                                add_uevent_var(env, "PHYSDEVPATH=%s", path);
                                kfree(path);
                        }

                        add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);

                        if (parent->driver)
                                add_uevent_var(env, "PHYSDEVDRIVER=%s",
                                               parent->driver->name);
                }
        } else if (dev->bus) {
                add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);

                if (dev->driver)
                        add_uevent_var(env, "PHYSDEVDRIVER=%s",
                                       dev->driver->name);
        }
#endif

        /* have the bus specific function add its stuff */
        if (dev->bus && dev->bus->uevent) {
                retval = dev->bus->uevent(dev, env);
                if (retval)
                        pr_debug("device: '%s': %s: bus uevent() returned %d\n",
                                 dev_name(dev), __func__, retval);
        }

        /* have the class specific function add its stuff */
        if (dev->class && dev->class->dev_uevent) {
                retval = dev->class->dev_uevent(dev, env);
                if (retval)
                        pr_debug("device: '%s': %s: class uevent() "
                                 "returned %d\n", dev_name(dev),
                                 __func__, retval);
        }

        /* have the device type specific fuction add its stuff */
        if (dev->type && dev->type->uevent) {
                retval = dev->type->uevent(dev, env);
                if (retval)
                        pr_debug("device: '%s': %s: dev_type uevent() "
                                 "returned %d\n", dev_name(dev),
                                 __func__, retval);
        }

        return retval;
}

static struct kset_uevent_ops device_uevent_ops = {
        .filter =       dev_uevent_filter,
        .name =         dev_uevent_name,
        .uevent =       dev_uevent,
};

static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
                           char *buf)
{
        struct kobject *top_kobj;
        struct kset *kset;
        struct kobj_uevent_env *env = NULL;
        int i;
        size_t count = 0;
        int retval;

        /* search the kset, the device belongs to */
        top_kobj = &dev->kobj;
        while (!top_kobj->kset && top_kobj->parent)
                top_kobj = top_kobj->parent;
        if (!top_kobj->kset)
                goto out;

        kset = top_kobj->kset;
        if (!kset->uevent_ops || !kset->uevent_ops->uevent)
                goto out;

        /* respect filter */
        if (kset->uevent_ops && kset->uevent_ops->filter)
                if (!kset->uevent_ops->filter(kset, &dev->kobj))
                        goto out;

        env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
        if (!env)
                return -ENOMEM;

        /* let the kset specific function add its keys */
        retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
        if (retval)
                goto out;

        /* copy keys to file */
        for (i = 0; i < env->envp_idx; i++)
                count += sprintf(&buf[count], "%s\n", env->envp[i]);
out:
        kfree(env);
        return count;
}

static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
                            const char *buf, size_t count)
{
        enum kobject_action action;

        if (kobject_action_type(buf, count, &action) == 0) {
                kobject_uevent(&dev->kobj, action);
                goto out;
        }

        dev_err(dev, "uevent: unsupported action-string; this will "
                     "be ignored in a future kernel version\n");
        kobject_uevent(&dev->kobj, KOBJ_ADD);
out:
        return count;
}

static struct device_attribute uevent_attr =
        __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);

static int device_add_attributes(struct device *dev,
                                 struct device_attribute *attrs)
{
        int error = 0;
        int i;

        if (attrs) {
                for (i = 0; attr_name(attrs[i]); i++) {
                        error = device_create_file(dev, &attrs[i]);
                        if (error)
                                break;
                }
                if (error)
                        while (--i >= 0)
                                device_remove_file(dev, &attrs[i]);
        }
        return error;
}

static void device_remove_attributes(struct device *dev,
                                     struct device_attribute *attrs)
{
        int i;

        if (attrs)
                for (i = 0; attr_name(attrs[i]); i++)
                        device_remove_file(dev, &attrs[i]);
}

static int device_add_groups(struct device *dev,
                             const struct attribute_group **groups)
{
        int error = 0;
        int i;

        if (groups) {
                for (i = 0; groups[i]; i++) {
                        error = sysfs_create_group(&dev->kobj, groups[i]);
                        if (error) {
                                while (--i >= 0)
                                        sysfs_remove_group(&dev->kobj,
                                                           groups[i]);
                                break;
                        }
                }
        }
        return error;
}

static void device_remove_groups(struct device *dev,
                                 const struct attribute_group **groups)
{
        int i;

        if (groups)
                for (i = 0; groups[i]; i++)
                        sysfs_remove_group(&dev->kobj, groups[i]);
}

static int device_add_attrs(struct device *dev)
{
        struct class *class = dev->class;
        struct device_type *type = dev->type;
        int error;

        if (class) {
                error = device_add_attributes(dev, class->dev_attrs);
                if (error)
                        return error;
        }

        if (type) {
                error = device_add_groups(dev, type->groups);
                if (error)
                        goto err_remove_class_attrs;
        }

        error = device_add_groups(dev, dev->groups);
        if (error)
                goto err_remove_type_groups;

        return 0;

 err_remove_type_groups:
        if (type)
                device_remove_groups(dev, type->groups);
 err_remove_class_attrs:
        if (class)
                device_remove_attributes(dev, class->dev_attrs);

        return error;
}

static void device_remove_attrs(struct device *dev)
{
        struct class *class = dev->class;
        struct device_type *type = dev->type;

        device_remove_groups(dev, dev->groups);

        if (type)
                device_remove_groups(dev, type->groups);

        if (class)
                device_remove_attributes(dev, class->dev_attrs);
}


static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        return print_dev_t(buf, dev->devt);
}

static struct device_attribute devt_attr =
        __ATTR(dev, S_IRUGO, show_dev, NULL);

/* kset to create /sys/devices/  */
struct kset *devices_kset;

/**
 * device_create_file - create sysfs attribute file for device.
 * @dev: device.
 * @attr: device attribute descriptor.
 */
int device_create_file(struct device *dev, struct device_attribute *attr)
{
        int error = 0;
        if (dev)
                error = sysfs_create_file(&dev->kobj, &attr->attr);
        return error;
}

/**
 * device_remove_file - remove sysfs attribute file.
 * @dev: device.
 * @attr: device attribute descriptor.
 */
void device_remove_file(struct device *dev, struct device_attribute *attr)
{
        if (dev)
                sysfs_remove_file(&dev->kobj, &attr->attr);
}

/**
 * device_create_bin_file - create sysfs binary attribute file for device.
 * @dev: device.
 * @attr: device binary attribute descriptor.
 */
int device_create_bin_file(struct device *dev, struct bin_attribute *attr)
{
        int error = -EINVAL;
        if (dev)
                error = sysfs_create_bin_file(&dev->kobj, attr);
        return error;
}
EXPORT_SYMBOL_GPL(device_create_bin_file);

/**
 * device_remove_bin_file - remove sysfs binary attribute file
 * @dev: device.
 * @attr: device binary attribute descriptor.
 */
void device_remove_bin_file(struct device *dev, struct bin_attribute *attr)
{
        if (dev)
                sysfs_remove_bin_file(&dev->kobj, attr);
}
EXPORT_SYMBOL_GPL(device_remove_bin_file);

/**
 * device_schedule_callback_owner - helper to schedule a callback for a device
 * @dev: device.
 * @func: callback function to invoke later.
 * @owner: module owning the callback routine
 *
 * Attribute methods must not unregister themselves or their parent device
 * (which would amount to the same thing).  Attempts to do so will deadlock,
 * since unregistration is mutually exclusive with driver callbacks.
 *
 * Instead methods can call this routine, which will attempt to allocate
 * and schedule a workqueue request to call back @func with @dev as its
 * argument in the workqueue's process context.  @dev will be pinned until
 * @func returns.
 *
 * This routine is usually called via the inline device_schedule_callback(),
 * which automatically sets @owner to THIS_MODULE.
 *
 * Returns 0 if the request was submitted, -ENOMEM if storage could not
 * be allocated, -ENODEV if a reference to @owner isn't available.
 *
 * NOTE: This routine won't work if CONFIG_SYSFS isn't set!  It uses an
 * underlying sysfs routine (since it is intended for use by attribute
 * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
 */
int device_schedule_callback_owner(struct device *dev,
                void (*func)(struct device *), struct module *owner)
{
        return sysfs_schedule_callback(&dev->kobj,
                        (void (*)(void *)) func, dev, owner);
}
EXPORT_SYMBOL_GPL(device_schedule_callback_owner);

static void klist_children_get(struct klist_node *n)
{
        struct device_private *p = to_device_private_parent(n);
        struct device *dev = p->device;

        get_device(dev);
}

static void klist_children_put(struct klist_node *n)
{
        struct device_private *p = to_device_private_parent(n);
        struct device *dev = p->device;

        put_device(dev);
}

/**
 * device_initialize - init device structure.
 * @dev: device.
 *
 * This prepares the device for use by other layers by initializing
 * its fields.
 * It is the first half of device_register(), if called by
 * that function, though it can also be called separately, so one
 * may use @dev's fields. In particular, get_device()/put_device()
 * may be used for reference counting of @dev after calling this
 * function.
 *
 * NOTE: Use put_device() to give up your reference instead of freeing
 * @dev directly once you have called this function.
 */
void device_initialize(struct device *dev)
{
        dev->kobj.kset = devices_kset;
        kobject_init(&dev->kobj, &device_ktype);
        INIT_LIST_HEAD(&dev->dma_pools);
        init_MUTEX(&dev->sem);
        spin_lock_init(&dev->devres_lock);
        INIT_LIST_HEAD(&dev->devres_head);
        device_init_wakeup(dev, 0);
        device_pm_init(dev);
        set_dev_node(dev, -1);
}

#ifdef CONFIG_SYSFS_DEPRECATED
static struct kobject *get_device_parent(struct device *dev,
                                         struct device *parent)
{
        /* class devices without a parent live in /sys/class/<classname>/ */
        if (dev->class && (!parent || parent->class != dev->class))
                return &dev->class->p->class_subsys.kobj;
        /* all other devices keep their parent */
        else if (parent)
                return &parent->kobj;

        return NULL;
}

static inline void cleanup_device_parent(struct device *dev) {}
static inline void cleanup_glue_dir(struct device *dev,
                                    struct kobject *glue_dir) {}
#else
static struct kobject *virtual_device_parent(struct device *dev)
{
        static struct kobject *virtual_dir = NULL;

        if (!virtual_dir)
                virtual_dir = kobject_create_and_add("virtual",
                                                     &devices_kset->kobj);

        return virtual_dir;
}

static struct kobject *get_device_parent(struct device *dev,
                                         struct device *parent)
{
        int retval;

        if (dev->class) {
                struct kobject *kobj = NULL;
                struct kobject *parent_kobj;
                struct kobject *k;

                /*
                 * If we have no parent, we live in "virtual".
                 * Class-devices with a non class-device as parent, live
                 * in a "glue" directory to prevent namespace collisions.
                 */
                if (parent == NULL)
                        parent_kobj = virtual_device_parent(dev);
                else if (parent->class)
                        return &parent->kobj;
                else
                        parent_kobj = &parent->kobj;

                /* find our class-directory at the parent and reference it */
                spin_lock(&dev->class->p->class_dirs.list_lock);
                list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
                        if (k->parent == parent_kobj) {
                                kobj = kobject_get(k);
                                break;
                        }
                spin_unlock(&dev->class->p->class_dirs.list_lock);
                if (kobj)
                        return kobj;

                /* or create a new class-directory at the parent device */
                k = kobject_create();
                if (!k)
                        return NULL;
                k->kset = &dev->class->p->class_dirs;
                retval = kobject_add(k, parent_kobj, "%s", dev->class->name);
                if (retval < 0) {
                        kobject_put(k);
                        return NULL;
                }
                /* do not emit an uevent for this simple "glue" directory */
                return k;
        }

        if (parent)
                return &parent->kobj;
        return NULL;
}

static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
{
        /* see if we live in a "glue" directory */
        if (!glue_dir || !dev->class ||
            glue_dir->kset != &dev->class->p->class_dirs)
                return;

        kobject_put(glue_dir);
}

static void cleanup_device_parent(struct device *dev)
{
        cleanup_glue_dir(dev, dev->kobj.parent);
}
#endif

static void setup_parent(struct device *dev, struct device *parent)
{
        struct kobject *kobj;
        kobj = get_device_parent(dev, parent);
        if (kobj)
                dev->kobj.parent = kobj;
}

static int device_add_class_symlinks(struct device *dev)
{
        int error;

        if (!dev->class)
                return 0;

        error = sysfs_create_link(&dev->kobj,
                                  &dev->class->p->class_subsys.kobj,
                                  "subsystem");
        if (error)
                goto out;

#ifdef CONFIG_SYSFS_DEPRECATED
        /* stacked class devices need a symlink in the class directory */
        if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
            device_is_not_partition(dev)) {
                error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
                                          &dev->kobj, dev_name(dev));
                if (error)
                        goto out_subsys;
        }

        if (dev->parent && device_is_not_partition(dev)) {
                struct device *parent = dev->parent;
                char *class_name;

                /*
                 * stacked class devices have the 'device' link
                 * pointing to the bus device instead of the parent
                 */
                while (parent->class && !parent->bus && parent->parent)
                        parent = parent->parent;

                error = sysfs_create_link(&dev->kobj,
                                          &parent->kobj,
                                          "device");
                if (error)
                        goto out_busid;

                class_name = make_class_name(dev->class->name,
                                                &dev->kobj);
                if (class_name)
                        error = sysfs_create_link(&dev->parent->kobj,
                                                &dev->kobj, class_name);
                kfree(class_name);
                if (error)
                        goto out_device;
        }
        return 0;

out_device:
        if (dev->parent && device_is_not_partition(dev))
                sysfs_remove_link(&dev->kobj, "device");
out_busid:
        if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
            device_is_not_partition(dev))
                sysfs_remove_link(&dev->class->p->class_subsys.kobj,
                                  dev_name(dev));
#else
        /* link in the class directory pointing to the device */
        error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
                                  &dev->kobj, dev_name(dev));
        if (error)
                goto out_subsys;

        if (dev->parent && device_is_not_partition(dev)) {
                error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
                                          "device");
                if (error)
                        goto out_busid;
        }
        return 0;

out_busid:
        sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
#endif

out_subsys:
        sysfs_remove_link(&dev->kobj, "subsystem");
out:
        return error;
}

static void device_remove_class_symlinks(struct device *dev)
{
        if (!dev->class)
                return;

#ifdef CONFIG_SYSFS_DEPRECATED
        if (dev->parent && device_is_not_partition(dev)) {
                char *class_name;

                class_name = make_class_name(dev->class->name, &dev->kobj);
                if (class_name) {
                        sysfs_remove_link(&dev->parent->kobj, class_name);
                        kfree(class_name);
                }
                sysfs_remove_link(&dev->kobj, "device");
        }

        if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
            device_is_not_partition(dev))
                sysfs_remove_link(&dev->class->p->class_subsys.kobj,
                                  dev_name(dev));
#else
        if (dev->parent && device_is_not_partition(dev))
                sysfs_remove_link(&dev->kobj, "device");

        sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
#endif

        sysfs_remove_link(&dev->kobj, "subsystem");
}

/**
 * dev_set_name - set a device name
 * @dev: device
 * @fmt: format string for the device's name
 */
int dev_set_name(struct device *dev, const char *fmt, ...)
{
        va_list vargs;
        int err;

        va_start(vargs, fmt);
        err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
        va_end(vargs);
        return err;
}
EXPORT_SYMBOL_GPL(dev_set_name);

/**
 * device_to_dev_kobj - select a /sys/dev/ directory for the device
 * @dev: device
 *
 * By default we select char/ for new entries.  Setting class->dev_obj
 * to NULL prevents an entry from being created.  class->dev_kobj must
 * be set (or cleared) before any devices are registered to the class
 * otherwise device_create_sys_dev_entry() and
 * device_remove_sys_dev_entry() will disagree about the the presence
 * of the link.
 */
static struct kobject *device_to_dev_kobj(struct device *dev)
{
        struct kobject *kobj;

        if (dev->class)
                kobj = dev->class->dev_kobj;
        else
                kobj = sysfs_dev_char_kobj;

        return kobj;
}

static int device_create_sys_dev_entry(struct device *dev)
{
        struct kobject *kobj = device_to_dev_kobj(dev);
        int error = 0;
        char devt_str[15];

        if (kobj) {
                format_dev_t(devt_str, dev->devt);
                error = sysfs_create_link(kobj, &dev->kobj, devt_str);
        }

        return error;
}

static void device_remove_sys_dev_entry(struct device *dev)
{
        struct kobject *kobj = device_to_dev_kobj(dev);
        char devt_str[15];

        if (kobj) {
                format_dev_t(devt_str, dev->devt);
                sysfs_remove_link(kobj, devt_str);
        }
}

int device_private_init(struct device *dev)
{
        dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
        if (!dev->p)
                return -ENOMEM;
        dev->p->device = dev;
        klist_init(&dev->p->klist_children, klist_children_get,
                   klist_children_put);
        return 0;
}

/**
 * device_add - add device to device hierarchy.
 * @dev: device.
 *
 * This is part 2 of device_register(), though may be called
 * separately _iff_ device_initialize() has been called separately.
 *
 * This adds @dev to the kobject hierarchy via kobject_add(), adds it
 * to the global and sibling lists for the device, then
 * adds it to the other relevant subsystems of the driver model.
 *
 * NOTE: _Never_ directly free @dev after calling this function, even
 * if it returned an error! Always use put_device() to give up your
 * reference instead.
 */
int device_add(struct device *dev)
{
        struct device *parent = NULL;
        struct class_interface *class_intf;
        int error = -EINVAL;

        dev = get_device(dev);
        if (!dev)
                goto done;

        if (!dev->p) {
                error = device_private_init(dev);
                if (error)
                        goto done;
        }

        /*
         * for statically allocated devices, which should all be converted
         * some day, we need to initialize the name. We prevent reading back
         * the name, and force the use of dev_name()
         */
        if (dev->init_name) {
                dev_set_name(dev, "%s", dev->init_name);
                dev->init_name = NULL;
        }

        if (!dev_name(dev))
                goto name_error;

        pr_debug("device: '%s': %s\n", dev_name(dev), __func__);

        parent = get_device(dev->parent);
        setup_parent(dev, parent);

        /* use parent numa_node */
        if (parent)
                set_dev_node(dev, dev_to_node(parent));

        /* first, register with generic layer. */
        /* we require the name to be set before, and pass NULL */
        error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
        if (error)
                goto Error;

        /* notify platform of device entry */
        if (platform_notify)
                platform_notify(dev);

        error = device_create_file(dev, &uevent_attr);
        if (error)
                goto attrError;

        if (MAJOR(dev->devt)) {
                error = device_create_file(dev, &devt_attr);
                if (error)
                        goto ueventattrError;

                error = device_create_sys_dev_entry(dev);
                if (error)
                        goto devtattrError;

                devtmpfs_create_node(dev);
        }

        error = device_add_class_symlinks(dev);
        if (error)
                goto SymlinkError;
        error = device_add_attrs(dev);
        if (error)
                goto AttrsError;
        error = bus_add_device(dev);
        if (error)
                goto BusError;
        error = dpm_sysfs_add(dev);
        if (error)
                goto DPMError;
        device_pm_add(dev);

        /* Notify clients of device addition.  This call must come
         * after dpm_sysf_add() and before kobject_uevent().
         */
        if (dev->bus)
                blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
                                             BUS_NOTIFY_ADD_DEVICE, dev);

        kobject_uevent(&dev->kobj, KOBJ_ADD);
        bus_probe_device(dev);
        if (parent)
                klist_add_tail(&dev->p->knode_parent,
                               &parent->p->klist_children);

        if (dev->class) {
                mutex_lock(&dev->class->p->class_mutex);
                /* tie the class to the device */
                klist_add_tail(&dev->knode_class,
                               &dev->class->p->class_devices);

                /* notify any interfaces that the device is here */
                list_for_each_entry(class_intf,
                                    &dev->class->p->class_interfaces, node)
                        if (class_intf->add_dev)
                                class_intf->add_dev(dev, class_intf);
                mutex_unlock(&dev->class->p->class_mutex);
        }
done:
        put_device(dev);
        return error;
 DPMError:
        bus_remove_device(dev);
 BusError:
        device_remove_attrs(dev);
 AttrsError:
        device_remove_class_symlinks(dev);
 SymlinkError:
        if (MAJOR(dev->devt))
                device_remove_sys_dev_entry(dev);
 devtattrError:
        if (MAJOR(dev->devt))
                device_remove_file(dev, &devt_attr);
 ueventattrError:
        device_remove_file(dev, &uevent_attr);
 attrError:
        kobject_uevent(&dev->kobj, KOBJ_REMOVE);
        kobject_del(&dev->kobj);
 Error:
        cleanup_device_parent(dev);
        if (parent)
                put_device(parent);
name_error:
        kfree(dev->p);
        dev->p = NULL;
        goto done;
}

/**
 * device_register - register a device with the system.
 * @dev: pointer to the device structure
 *
 * This happens in two clean steps - initialize the device
 * and add it to the system. The two steps can be called
 * separately, but this is the easiest and most common.
 * I.e. you should only call the two helpers separately if
 * have a clearly defined need to use and refcount the device
 * before it is added to the hierarchy.
 *
 * NOTE: _Never_ directly free @dev after calling this function, even
 * if it returned an error! Always use put_device() to give up the
 * reference initialized in this function instead.
 */
int device_register(struct device *dev)
{
        device_initialize(dev);
        return device_add(dev);
}

/**
 * get_device - increment reference count for device.
 * @dev: device.
 *
 * This simply forwards the call to kobject_get(), though
 * we do take care to provide for the case that we get a NULL
 * pointer passed in.
 */
struct device *get_device(struct device *dev)
{
        return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
}

/**
 * put_device - decrement reference count.
 * @dev: device in question.
 */
void put_device(struct device *dev)
{
        /* might_sleep(); */
        if (dev)
                kobject_put(&dev->kobj);
}

/**
 * device_del - delete device from system.
 * @dev: device.
 *
 * This is the first part of the device unregistration
 * sequence. This removes the device from the lists we control
 * from here, has it removed from the other driver model
 * subsystems it was added to in device_add(), and removes it
 * from the kobject hierarchy.
 *
 * NOTE: this should be called manually _iff_ device_add() was
 * also called manually.
 */
void device_del(struct device *dev)
{
        struct device *parent = dev->parent;
        struct class_interface *class_intf;

        /* Notify clients of device removal.  This call must come
         * before dpm_sysfs_remove().
         */
        if (dev->bus)
                blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
                                             BUS_NOTIFY_DEL_DEVICE, dev);
        device_pm_remove(dev);
        dpm_sysfs_remove(dev);
        if (parent)
                klist_del(&dev->p->knode_parent);
        if (MAJOR(dev->devt)) {
                devtmpfs_delete_node(dev);
                device_remove_sys_dev_entry(dev);
                device_remove_file(dev, &devt_attr);
        }
        if (dev->class) {
                device_remove_class_symlinks(dev);

                mutex_lock(&dev->class->p->class_mutex);
                /* notify any interfaces that the device is now gone */
                list_for_each_entry(class_intf,
                                    &dev->class->p->class_interfaces, node)
                        if (class_intf->remove_dev)
                                class_intf->remove_dev(dev, class_intf);
                /* remove the device from the class list */
                klist_del(&dev->knode_class);
                mutex_unlock(&dev->class->p->class_mutex);
        }
        device_remove_file(dev, &uevent_attr);
        device_remove_attrs(dev);
        bus_remove_device(dev);

        /*
         * Some platform devices are driven without driver attached
         * and managed resources may have been acquired.  Make sure
         * all resources are released.
         */
        devres_release_all(dev);

        /* Notify the platform of the removal, in case they
         * need to do anything...
         */
        if (platform_notify_remove)
                platform_notify_remove(dev);
        kobject_uevent(&dev->kobj, KOBJ_REMOVE);
        cleanup_device_parent(dev);
        kobject_del(&dev->kobj);
        put_device(parent);
}

/**
 * device_unregister - unregister device from system.
 * @dev: device going away.
 *
 * We do this in two parts, like we do device_register(). First,
 * we remove it from all the subsystems with device_del(), then
 * we decrement the reference count via put_device(). If that
 * is the final reference count, the device will be cleaned up
 * via device_release() above. Otherwise, the structure will
 * stick around until the final reference to the device is dropped.
 */
void device_unregister(struct device *dev)
{
        pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
        device_del(dev);
        put_device(dev);
}

static struct device *next_device(struct klist_iter *i)
{
        struct klist_node *n = klist_next(i);
        struct device *dev = NULL;
        struct device_private *p;

        if (n) {
                p = to_device_private_parent(n);
                dev = p->device;
        }
        return dev;
}

/**
 * device_get_devnode - path of device node file
 * @dev: device
 * @mode: returned file access mode
 * @tmp: possibly allocated string
 *
 * Return the relative path of a possible device node.
 * Non-default names may need to allocate a memory to compose
 * a name. This memory is returned in tmp and needs to be
 * freed by the caller.
 */
const char *device_get_devnode(struct device *dev,
                               mode_t *mode, const char **tmp)
{
        char *s;

        *tmp = NULL;

        /* the device type may provide a specific name */
        if (dev->type && dev->type->devnode)
                *tmp = dev->type->devnode(dev, mode);
        if (*tmp)
                return *tmp;

        /* the class may provide a specific name */
        if (dev->class && dev->class->devnode)
                *tmp = dev->class->devnode(dev, mode);
        if (*tmp)
                return *tmp;

        /* return name without allocation, tmp == NULL */
        if (strchr(dev_name(dev), '!') == NULL)
                return dev_name(dev);

        /* replace '!' in the name with '/' */
        *tmp = kstrdup(dev_name(dev), GFP_KERNEL);
        if (!*tmp)
                return NULL;
        while ((s = strchr(*tmp, '!')))
                s[0] = '/';
        return *tmp;
}

/**
 * device_for_each_child - device child iterator.
 * @parent: parent struct device.
 * @data: data for the callback.
 * @fn: function to be called for each device.
 *
 * Iterate over @parent's child devices, and call @fn for each,
 * passing it @data.
 *
 * We check the return of @fn each time. If it returns anything
 * other than 0, we break out and return that value.
 */
int device_for_each_child(struct device *parent, void *data,
                          int (*fn)(struct device *dev, void *data))
{
        struct klist_iter i;
        struct device *child;
        int error = 0;

        if (!parent->p)
                return 0;

        klist_iter_init(&parent->p->klist_children, &i);
        while ((child = next_device(&i)) && !error)
                error = fn(child, data);
        klist_iter_exit(&i);
        return error;
}

/**
 * device_find_child - device iterator for locating a particular device.
 * @parent: parent struct device
 * @data: Data to pass to match function
 * @match: Callback function to check device
 *
 * This is similar to the device_for_each_child() function above, but it
 * returns a reference to a device that is 'found' for later use, as
 * determined by the @match callback.
 *
 * The callback should return 0 if the device doesn't match and non-zero
 * if it does.  If the callback returns non-zero and a reference to the
 * current device can be obtained, this function will return to the caller
 * and not iterate over any more devices.
 */
struct device *device_find_child(struct device *parent, void *data,
                                 int (*match)(struct device *dev, void *data))
{
        struct klist_iter i;
        struct device *child;

        if (!parent)
                return NULL;

        klist_iter_init(&parent->p->klist_children, &i);
        while ((child = next_device(&i)))
                if (match(child, data) && get_device(child))
                        break;
        klist_iter_exit(&i);
        return child;
}

int __init devices_init(void)
{
        devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
        if (!devices_kset)
                return -ENOMEM;
        dev_kobj = kobject_create_and_add("dev", NULL);
        if (!dev_kobj)
                goto dev_kobj_err;
        sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
        if (!sysfs_dev_block_kobj)
                goto block_kobj_err;
        sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
        if (!sysfs_dev_char_kobj)
                goto char_kobj_err;

        return 0;

 char_kobj_err:
        kobject_put(sysfs_dev_block_kobj);
 block_kobj_err:
        kobject_put(dev_kobj);
 dev_kobj_err:
        kset_unregister(devices_kset);
        return -ENOMEM;
}

EXPORT_SYMBOL_GPL(device_for_each_child);
EXPORT_SYMBOL_GPL(device_find_child);

EXPORT_SYMBOL_GPL(device_initialize);
EXPORT_SYMBOL_GPL(device_add);
EXPORT_SYMBOL_GPL(device_register);

EXPORT_SYMBOL_GPL(device_del);
EXPORT_SYMBOL_GPL(device_unregister);
EXPORT_SYMBOL_GPL(get_device);
EXPORT_SYMBOL_GPL(put_device);

EXPORT_SYMBOL_GPL(device_create_file);
EXPORT_SYMBOL_GPL(device_remove_file);

struct root_device
{
        struct device dev;
        struct module *owner;
};

#define to_root_device(dev) container_of(dev, struct root_device, dev)

static void root_device_release(struct device *dev)
{
        kfree(to_root_device(dev));
}

/**
 * __root_device_register - allocate and register a root device
 * @name: root device name
 * @owner: owner module of the root device, usually THIS_MODULE
 *
 * This function allocates a root device and registers it
 * using device_register(). In order to free the returned
 * device, use root_device_unregister().
 *
 * Root devices are dummy devices which allow other devices
 * to be grouped under /sys/devices. Use this function to
 * allocate a root device and then use it as the parent of
 * any device which should appear under /sys/devices/{name}
 *
 * The /sys/devices/{name} directory will also contain a
 * 'module' symlink which points to the @owner directory
 * in sysfs.
 *
 * Note: You probably want to use root_device_register().
 */
struct device *__root_device_register(const char *name, struct module *owner)
{
        struct root_device *root;
        int err = -ENOMEM;

        root = kzalloc(sizeof(struct root_device), GFP_KERNEL);
        if (!root)
                return ERR_PTR(err);

        err = dev_set_name(&root->dev, "%s", name);
        if (err) {
                kfree(root);
                return ERR_PTR(err);
        }

        root->dev.release = root_device_release;

        err = device_register(&root->dev);
        if (err) {
                put_device(&root->dev);
                return ERR_PTR(err);
        }

#ifdef CONFIG_MODULE    /* gotta find a "cleaner" way to do this */
        if (owner) {
                struct module_kobject *mk = &owner->mkobj;

                err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module");
                if (err) {
                        device_unregister(&root->dev);
                        return ERR_PTR(err);
                }
                root->owner = owner;
        }
#endif

        return &root->dev;
}
EXPORT_SYMBOL_GPL(__root_device_register);

/**
 * root_device_unregister - unregister and free a root device
 * @dev: device going away
 *
 * This function unregisters and cleans up a device that was created by
 * root_device_register().
 */
void root_device_unregister(struct device *dev)
{
        struct root_device *root = to_root_device(dev);

        if (root->owner)
                sysfs_remove_link(&root->dev.kobj, "module");

        device_unregister(dev);
}
EXPORT_SYMBOL_GPL(root_device_unregister);


static void device_create_release(struct device *dev)
{
        pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
        kfree(dev);
}

/**
 * device_create_vargs - creates a device and registers it with sysfs
 * @class: pointer to the struct class that this device should be registered to
 * @parent: pointer to the parent struct device of this new device, if any
 * @devt: the dev_t for the char device to be added
 * @drvdata: the data to be added to the device for callbacks
 * @fmt: string for the device's name
 * @args: va_list for the device's name
 *
 * This function can be used by char device classes.  A struct device
 * will be created in sysfs, registered to the specified class.
 *
 * A "dev" file will be created, showing the dev_t for the device, if
 * the dev_t is not 0,0.
 * If a pointer to a parent struct device is passed in, the newly created
 * struct device will be a child of that device in sysfs.
 * The pointer to the struct device will be returned from the call.
 * Any further sysfs files that might be required can be created using this
 * pointer.
 *
 * Note: the struct class passed to this function must have previously
 * been created with a call to class_create().
 */
struct device *device_create_vargs(struct class *class, struct device *parent,
                                   dev_t devt, void *drvdata, const char *fmt,
                                   va_list args)
{
        struct device *dev = NULL;
        int retval = -ENODEV;

        if (class == NULL || IS_ERR(class))
                goto error;

        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
        if (!dev) {
                retval = -ENOMEM;
                goto error;
        }

        dev->devt = devt;
        dev->class = class;
        dev->parent = parent;
        dev->release = device_create_release;
        dev_set_drvdata(dev, drvdata);

        retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
        if (retval)
                goto error;

        retval = device_register(dev);
        if (retval)
                goto error;

        return dev;

error:
        put_device(dev);
        return ERR_PTR(retval);
}
EXPORT_SYMBOL_GPL(device_create_vargs);

/**
 * device_create - creates a device and registers it with sysfs
 * @class: pointer to the struct class that this device should be registered to
 * @parent: pointer to the parent struct device of this new device, if any
 * @devt: the dev_t for the char device to be added
 * @drvdata: the data to be added to the device for callbacks
 * @fmt: string for the device's name
 *
 * This function can be used by char device classes.  A struct device
 * will be created in sysfs, registered to the specified class.
 *
 * A "dev" file will be created, showing the dev_t for the device, if
 * the dev_t is not 0,0.
 * If a pointer to a parent struct device is passed in, the newly created
 * struct device will be a child of that device in sysfs.
 * The pointer to the struct device will be returned from the call.
 * Any further sysfs files that might be required can be created using this
 * pointer.
 *
 * Note: the struct class passed to this function must have previously
 * been created with a call to class_create().
 */
struct device *device_create(struct class *class, struct device *parent,
                             dev_t devt, void *drvdata, const char *fmt, ...)
{
        va_list vargs;
        struct device *dev;

        va_start(vargs, fmt);
        dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
        va_end(vargs);
        return dev;
}
EXPORT_SYMBOL_GPL(device_create);

static int __match_devt(struct device *dev, void *data)
{
        dev_t *devt = data;

        return dev->devt == *devt;
}

/**
 * device_destroy - removes a device that was created with device_create()
 * @class: pointer to the struct class that this device was registered with
 * @devt: the dev_t of the device that was previously registered
 *
 * This call unregisters and cleans up a device that was created with a
 * call to device_create().
 */
void device_destroy(struct class *class, dev_t devt)
{
        struct device *dev;

        dev = class_find_device(class, NULL, &devt, __match_devt);
        if (dev) {
                put_device(dev);
                device_unregister(dev);
        }
}
EXPORT_SYMBOL_GPL(device_destroy);

/**
 * device_rename - renames a device
 * @dev: the pointer to the struct device to be renamed
 * @new_name: the new name of the device
 *
 * It is the responsibility of the caller to provide mutual
 * exclusion between two different calls of device_rename
 * on the same device to ensure that new_name is valid and
 * won't conflict with other devices.
 */
int device_rename(struct device *dev, char *new_name)
{
        char *old_class_name = NULL;
        char *new_class_name = NULL;
        char *old_device_name = NULL;
        int error;

        dev = get_device(dev);
        if (!dev)
                return -EINVAL;

        pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
                 __func__, new_name);

#ifdef CONFIG_SYSFS_DEPRECATED
        if ((dev->class) && (dev->parent))
                old_class_name = make_class_name(dev->class->name, &dev->kobj);
#endif

        old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
        if (!old_device_name) {
                error = -ENOMEM;
                goto out;
        }

        error = kobject_rename(&dev->kobj, new_name);
        if (error)
                goto out;

#ifdef CONFIG_SYSFS_DEPRECATED
        if (old_class_name) {
                new_class_name = make_class_name(dev->class->name, &dev->kobj);
                if (new_class_name) {
                        error = sysfs_create_link_nowarn(&dev->parent->kobj,
                                                         &dev->kobj,
                                                         new_class_name);
                        if (error)
                                goto out;
                        sysfs_remove_link(&dev->parent->kobj, old_class_name);
                }
        }
#else
        if (dev->class) {
                error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj,
                                                 &dev->kobj, dev_name(dev));
                if (error)
                        goto out;
                sysfs_remove_link(&dev->class->p->class_subsys.kobj,
                                  old_device_name);
        }
#endif

out:
        put_device(dev);

        kfree(new_class_name);
        kfree(old_class_name);
        kfree(old_device_name);

        return error;
}
EXPORT_SYMBOL_GPL(device_rename);

static int device_move_class_links(struct device *dev,
                                   struct device *old_parent,
                                   struct device *new_parent)
{
        int error = 0;
#ifdef CONFIG_SYSFS_DEPRECATED
        char *class_name;

        class_name = make_class_name(dev->class->name, &dev->kobj);
        if (!class_name) {
                error = -ENOMEM;
                goto out;
        }
        if (old_parent) {
                sysfs_remove_link(&dev->kobj, "device");
                sysfs_remove_link(&old_parent->kobj, class_name);
        }
        if (new_parent) {
                error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
                                          "device");
                if (error)
                        goto out;
                error = sysfs_create_link(&new_parent->kobj, &dev->kobj,
                                          class_name);
                if (error)
                        sysfs_remove_link(&dev->kobj, "device");
        } else
                error = 0;
out:
        kfree(class_name);
        return error;
#else
        if (old_parent)
                sysfs_remove_link(&dev->kobj, "device");
        if (new_parent)
                error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
                                          "device");
        return error;
#endif
}

/**
 * device_move - moves a device to a new parent
 * @dev: the pointer to the struct device to be moved
 * @new_parent: the new parent of the device (can by NULL)
 * @dpm_order: how to reorder the dpm_list
 */
int device_move(struct device *dev, struct device *new_parent,
                enum dpm_order dpm_order)
{
        int error;
        struct device *old_parent;
        struct kobject *new_parent_kobj;

        dev = get_device(dev);
        if (!dev)
                return -EINVAL;

        device_pm_lock();
        new_parent = get_device(new_parent);
        new_parent_kobj = get_device_parent(dev, new_parent);

        pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev),
                 __func__, new_parent ? dev_name(new_parent) : "<NULL>");
        error = kobject_move(&dev->kobj, new_parent_kobj);
        if (error) {
                cleanup_glue_dir(dev, new_parent_kobj);
                put_device(new_parent);
                goto out;
        }
        old_parent = dev->parent;
        dev->parent = new_parent;
        if (old_parent)
                klist_remove(&dev->p->knode_parent);
        if (new_parent) {
                klist_add_tail(&dev->p->knode_parent,
                               &new_parent->p->klist_children);
                set_dev_node(dev, dev_to_node(new_parent));
        }

        if (!dev->class)
                goto out_put;
        error = device_move_class_links(dev, old_parent, new_parent);
        if (error) {
                /* We ignore errors on cleanup since we're hosed anyway... */
                device_move_class_links(dev, new_parent, old_parent);
                if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
                        if (new_parent)
                                klist_remove(&dev->p->knode_parent);
                        dev->parent = old_parent;
                        if (old_parent) {
                                klist_add_tail(&dev->p->knode_parent,
                                               &old_parent->p->klist_children);
                                set_dev_node(dev, dev_to_node(old_parent));
                        }
                }
                cleanup_glue_dir(dev, new_parent_kobj);
                put_device(new_parent);
                goto out;
        }
        switch (dpm_order) {
        case DPM_ORDER_NONE:
                break;
        case DPM_ORDER_DEV_AFTER_PARENT:
                device_pm_move_after(dev, new_parent);
                break;
        case DPM_ORDER_PARENT_BEFORE_DEV:
                device_pm_move_before(new_parent, dev);
                break;
        case DPM_ORDER_DEV_LAST:
                device_pm_move_last(dev);
                break;
        }
out_put:
        put_device(old_parent);
out:
        device_pm_unlock();
        put_device(dev);
        return error;
}
EXPORT_SYMBOL_GPL(device_move);

/**
 * device_shutdown - call ->shutdown() on each device to shutdown.
 */
void device_shutdown(void)
{
        struct device *dev, *devn;

        list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
                                kobj.entry) {
                if (dev->bus && dev->bus->shutdown) {
                        dev_dbg(dev, "shutdown\n");
                        dev->bus->shutdown(dev);
                } else if (dev->driver && dev->driver->shutdown) {
                        dev_dbg(dev, "shutdown\n");
                        dev->driver->shutdown(dev);
                }
        }
        kobject_put(sysfs_dev_char_kobj);
        kobject_put(sysfs_dev_block_kobj);
        kobject_put(dev_kobj);
        async_synchronize_full();
}