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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [base/] [class.c] - Blame information for rev 62

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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) 2003-2004 Greg Kroah-Hartman
 * Copyright (c) 2003-2004 IBM Corp.
 *
 * This file is released under the GPLv2
 *
 */
 
#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/kdev_t.h>
#include <linux/err.h>
#include <linux/slab.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.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 = -EIO;
 
        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 = -EIO;
 
        if (class_attr->store)
                ret = class_attr->store(dc, buf, count);
        return ret;
}
 
static void class_release(struct kobject * kobj)
{
        struct class *class = to_class(kobj);
 
        pr_debug("class '%s': release.\n", class->name);
 
        if (class->class_release)
                class->class_release(class);
        else
                pr_debug("class '%s' does not have a release() function, "
                         "be careful\n", class->name);
}
 
static struct sysfs_ops class_sysfs_ops = {
        .show   = class_attr_show,
        .store  = class_attr_store,
};
 
static struct kobj_type class_ktype = {
        .sysfs_ops      = &class_sysfs_ops,
        .release        = class_release,
};
 
/* Hotplug events for classes go to the class_obj subsys */
static decl_subsys(class, &class_ktype, NULL);
 
 
int class_create_file(struct class * cls, const struct class_attribute * attr)
{
        int error;
        if (cls) {
                error = sysfs_create_file(&cls->subsys.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.kobj, &attr->attr);
}
 
static struct class *class_get(struct class *cls)
{
        if (cls)
                return container_of(kset_get(&cls->subsys), struct class, subsys);
        return NULL;
}
 
static void class_put(struct class * cls)
{
        if (cls)
                kset_put(&cls->subsys);
}
 
 
static int add_class_attrs(struct class * cls)
{
        int i;
        int error = 0;
 
        if (cls->class_attrs) {
                for (i = 0; attr_name(cls->class_attrs[i]); i++) {
                        error = class_create_file(cls,&cls->class_attrs[i]);
                        if (error)
                                goto Err;
                }
        }
 Done:
        return error;
 Err:
        while (--i >= 0)
                class_remove_file(cls,&cls->class_attrs[i]);
        goto Done;
}
 
static void remove_class_attrs(struct class * cls)
{
        int i;
 
        if (cls->class_attrs) {
                for (i = 0; attr_name(cls->class_attrs[i]); i++)
                        class_remove_file(cls,&cls->class_attrs[i]);
        }
}
 
int class_register(struct class * cls)
{
        int error;
 
        pr_debug("device class '%s': registering\n", cls->name);
 
        INIT_LIST_HEAD(&cls->children);
        INIT_LIST_HEAD(&cls->devices);
        INIT_LIST_HEAD(&cls->interfaces);
        kset_init(&cls->class_dirs);
        init_MUTEX(&cls->sem);
        error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name);
        if (error)
                return error;
 
        cls->subsys.kobj.kset = &class_subsys;
 
        error = subsystem_register(&cls->subsys);
        if (!error) {
                error = add_class_attrs(class_get(cls));
                class_put(cls);
        }
        return error;
}
 
void class_unregister(struct class * cls)
{
        pr_debug("device class '%s': unregistering\n", cls->name);
        remove_class_attrs(cls);
        subsystem_unregister(&cls->subsys);
}
 
static void class_create_release(struct class *cls)
{
        pr_debug("%s called for %s\n", __FUNCTION__, cls->name);
        kfree(cls);
}
 
static void class_device_create_release(struct class_device *class_dev)
{
        pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
        kfree(class_dev);
}
 
/* needed to allow these devices to have parent class devices */
static int class_device_create_uevent(struct class_device *class_dev,
                                      struct kobj_uevent_env *env)
{
        pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id);
        return 0;
}
 
/**
 * class_create - create a struct class structure
 * @owner: pointer to the module that is to "own" this struct class
 * @name: pointer to a string for the name of this class.
 *
 * This is used to create a struct class pointer that can then be used
 * in calls to class_device_create().
 *
 * Note, the pointer created here is to be destroyed when finished by
 * making a call to class_destroy().
 */
struct class *class_create(struct module *owner, const char *name)
{
        struct class *cls;
        int retval;
 
        cls = kzalloc(sizeof(*cls), GFP_KERNEL);
        if (!cls) {
                retval = -ENOMEM;
                goto error;
        }
 
        cls->name = name;
        cls->owner = owner;
        cls->class_release = class_create_release;
        cls->release = class_device_create_release;
 
        retval = class_register(cls);
        if (retval)
                goto error;
 
        return cls;
 
error:
        kfree(cls);
        return ERR_PTR(retval);
}
 
/**
 * class_destroy - destroys a struct class structure
 * @cls: pointer to the struct class that is to be destroyed
 *
 * Note, the pointer to be destroyed must have been created with a call
 * to class_create().
 */
void class_destroy(struct class *cls)
{
        if ((cls == NULL) || (IS_ERR(cls)))
                return;
 
        class_unregister(cls);
}
 
/* 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 = 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);
}
 
int class_device_create_bin_file(struct class_device *class_dev,
                                 struct bin_attribute *attr)
{
        int error = -EINVAL;
        if (class_dev)
                error = sysfs_create_bin_file(&class_dev->kobj, attr);
        return error;
}
 
void class_device_remove_bin_file(struct class_device *class_dev,
                                  struct bin_attribute *attr)
{
        if (class_dev)
                sysfs_remove_bin_file(&class_dev->kobj, attr);
}
 
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 (cd->release)
                cd->release(cd);
        else if (cls->release)
                cls->release(cd);
        else {
                printk(KERN_ERR "Class Device '%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 class_device_ktype = {
        .sysfs_ops      = &class_dev_sysfs_ops,
        .release        = class_dev_release,
};
 
static int class_uevent_filter(struct kset *kset, struct kobject *kobj)
{
        struct kobj_type *ktype = get_ktype(kobj);
 
        if (ktype == &class_device_ktype) {
                struct class_device *class_dev = to_class_dev(kobj);
                if (class_dev->class)
                        return 1;
        }
        return 0;
}
 
static const char *class_uevent_name(struct kset *kset, struct kobject *kobj)
{
        struct class_device *class_dev = to_class_dev(kobj);
 
        return class_dev->class->name;
}
 
#ifdef CONFIG_SYSFS_DEPRECATED
char *make_class_name(const char *name, struct kobject *kobj)
{
        char *class_name;
        int size;
 
        size = strlen(name) + strlen(kobject_name(kobj)) + 2;
 
        class_name = kmalloc(size, GFP_KERNEL);
        if (!class_name)
                return NULL;
 
        strcpy(class_name, name);
        strcat(class_name, ":");
        strcat(class_name, kobject_name(kobj));
        return class_name;
}
 
static int make_deprecated_class_device_links(struct class_device *class_dev)
{
        char *class_name;
        int error;
 
        if (!class_dev->dev)
                return 0;
 
        class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
        if (class_name)
                error = sysfs_create_link(&class_dev->dev->kobj,
                                          &class_dev->kobj, class_name);
        else
                error = -ENOMEM;
        kfree(class_name);
        return error;
}
 
static void remove_deprecated_class_device_links(struct class_device *class_dev)
{
        char *class_name;
 
        if (!class_dev->dev)
                return;
 
        class_name = make_class_name(class_dev->class->name, &class_dev->kobj);
        if (class_name)
                sysfs_remove_link(&class_dev->dev->kobj, class_name);
        kfree(class_name);
}
#else
static inline int make_deprecated_class_device_links(struct class_device *cd)
{ return 0; }
static void remove_deprecated_class_device_links(struct class_device *cd)
{ }
#endif
 
static int class_uevent(struct kset *kset, struct kobject *kobj,
                        struct kobj_uevent_env *env)
{
        struct class_device *class_dev = to_class_dev(kobj);
        struct device *dev = class_dev->dev;
        int retval = 0;
 
        pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
 
        if (MAJOR(class_dev->devt)) {
                add_uevent_var(env, "MAJOR=%u", MAJOR(class_dev->devt));
 
                add_uevent_var(env, "MINOR=%u", MINOR(class_dev->devt));
        }
 
        if (dev) {
                const char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
                if (path) {
                        add_uevent_var(env, "PHYSDEVPATH=%s", path);
                        kfree(path);
                }
 
                if (dev->bus)
                        add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
 
                if (dev->driver)
                        add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name);
        }
 
        if (class_dev->uevent) {
                /* have the class device specific function add its stuff */
                retval = class_dev->uevent(class_dev, env);
                if (retval)
                        pr_debug("class_dev->uevent() returned %d\n", retval);
        } else if (class_dev->class->uevent) {
                /* have the class specific function add its stuff */
                retval = class_dev->class->uevent(class_dev, env);
                if (retval)
                        pr_debug("class->uevent() returned %d\n", retval);
        }
 
        return retval;
}
 
static struct kset_uevent_ops class_uevent_ops = {
        .filter =       class_uevent_filter,
        .name =         class_uevent_name,
        .uevent =       class_uevent,
};
 
static decl_subsys(class_obj, &class_device_ktype, &class_uevent_ops);
 
 
static int class_device_add_attrs(struct class_device * cd)
{
        int i;
        int error = 0;
        struct class * cls = cd->class;
 
        if (cls->class_dev_attrs) {
                for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) {
                        error = class_device_create_file(cd,
                                                         &cls->class_dev_attrs[i]);
                        if (error)
                                goto Err;
                }
        }
 Done:
        return error;
 Err:
        while (--i >= 0)
                class_device_remove_file(cd,&cls->class_dev_attrs[i]);
        goto Done;
}
 
static void class_device_remove_attrs(struct class_device * cd)
{
        int i;
        struct class * cls = cd->class;
 
        if (cls->class_dev_attrs) {
                for (i = 0; attr_name(cls->class_dev_attrs[i]); i++)
                        class_device_remove_file(cd,&cls->class_dev_attrs[i]);
        }
}
 
static int class_device_add_groups(struct class_device * cd)
{
        int i;
        int error = 0;
 
        if (cd->groups) {
                for (i = 0; cd->groups[i]; i++) {
                        error = sysfs_create_group(&cd->kobj, cd->groups[i]);
                        if (error) {
                                while (--i >= 0)
                                        sysfs_remove_group(&cd->kobj, cd->groups[i]);
                                goto out;
                        }
                }
        }
out:
        return error;
}
 
static void class_device_remove_groups(struct class_device * cd)
{
        int i;
        if (cd->groups) {
                for (i = 0; cd->groups[i]; i++) {
                        sysfs_remove_group(&cd->kobj, cd->groups[i]);
                }
        }
}
 
static ssize_t show_dev(struct class_device *class_dev, char *buf)
{
        return print_dev_t(buf, class_dev->devt);
}
 
static struct class_device_attribute class_devt_attr =
        __ATTR(dev, S_IRUGO, show_dev, NULL);
 
static ssize_t store_uevent(struct class_device *class_dev,
                            const char *buf, size_t count)
{
        kobject_uevent(&class_dev->kobj, KOBJ_ADD);
        return count;
}
 
static struct class_device_attribute class_uevent_attr =
        __ATTR(uevent, S_IWUSR, NULL, store_uevent);
 
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_class = NULL;
        struct class_device *parent_class_dev = NULL;
        struct class_interface *class_intf;
        int error = -EINVAL;
 
        class_dev = class_device_get(class_dev);
        if (!class_dev)
                return -EINVAL;
 
        if (!strlen(class_dev->class_id))
                goto out1;
 
        parent_class = class_get(class_dev->class);
        if (!parent_class)
                goto out1;
 
        parent_class_dev = class_device_get(class_dev->parent);
 
        pr_debug("CLASS: registering class device: ID = '%s'\n",
                 class_dev->class_id);
 
        /* first, register with generic layer. */
        error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
        if (error)
                goto out2;
 
        if (parent_class_dev)
                class_dev->kobj.parent = &parent_class_dev->kobj;
        else
                class_dev->kobj.parent = &parent_class->subsys.kobj;
 
        error = kobject_add(&class_dev->kobj);
        if (error)
                goto out2;
 
        /* add the needed attributes to this device */
        error = sysfs_create_link(&class_dev->kobj,
                                  &parent_class->subsys.kobj, "subsystem");
        if (error)
                goto out3;
 
        error = class_device_create_file(class_dev, &class_uevent_attr);
        if (error)
                goto out3;
 
        if (MAJOR(class_dev->devt)) {
                error = class_device_create_file(class_dev, &class_devt_attr);
                if (error)
                        goto out4;
        }
 
        error = class_device_add_attrs(class_dev);
        if (error)
                goto out5;
 
        if (class_dev->dev) {
                error = sysfs_create_link(&class_dev->kobj,
                                          &class_dev->dev->kobj, "device");
                if (error)
                        goto out6;
        }
 
        error = class_device_add_groups(class_dev);
        if (error)
                goto out7;
 
        error = make_deprecated_class_device_links(class_dev);
        if (error)
                goto out8;
 
        kobject_uevent(&class_dev->kobj, KOBJ_ADD);
 
        /* notify any interfaces this device is now here */
        down(&parent_class->sem);
        list_add_tail(&class_dev->node, &parent_class->children);
        list_for_each_entry(class_intf, &parent_class->interfaces, node) {
                if (class_intf->add)
                        class_intf->add(class_dev, class_intf);
        }
        up(&parent_class->sem);
 
        goto out1;
 
 out8:
        class_device_remove_groups(class_dev);
 out7:
        if (class_dev->dev)
                sysfs_remove_link(&class_dev->kobj, "device");
 out6:
        class_device_remove_attrs(class_dev);
 out5:
        if (MAJOR(class_dev->devt))
                class_device_remove_file(class_dev, &class_devt_attr);
 out4:
        class_device_remove_file(class_dev, &class_uevent_attr);
 out3:
        kobject_del(&class_dev->kobj);
 out2:
        if(parent_class_dev)
                class_device_put(parent_class_dev);
        class_put(parent_class);
 out1:
        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);
}
 
/**
 * class_device_create - creates a class device and registers it with sysfs
 * @cls: pointer to the struct class that this device should be registered to.
 * @parent: pointer to the parent struct class_device of this new device, if any.
 * @devt: the dev_t for the char device to be added.
 * @device: a pointer to a struct device that is assiociated with this class device.
 * @fmt: string for the class device's name
 *
 * This function can be used by char device classes.  A struct
 * class_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 class_device is passed in, the newly
 * created struct class_device will be a child of that device in sysfs.
 * The pointer to the struct class_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 class_device *class_device_create(struct class *cls,
                                         struct class_device *parent,
                                         dev_t devt,
                                         struct device *device,
                                         const char *fmt, ...)
{
        va_list args;
        struct class_device *class_dev = NULL;
        int retval = -ENODEV;
 
        if (cls == NULL || IS_ERR(cls))
                goto error;
 
        class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL);
        if (!class_dev) {
                retval = -ENOMEM;
                goto error;
        }
 
        class_dev->devt = devt;
        class_dev->dev = device;
        class_dev->class = cls;
        class_dev->parent = parent;
        class_dev->release = class_device_create_release;
        class_dev->uevent = class_device_create_uevent;
 
        va_start(args, fmt);
        vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args);
        va_end(args);
        retval = class_device_register(class_dev);
        if (retval)
                goto error;
 
        return class_dev;
 
error:
        kfree(class_dev);
        return ERR_PTR(retval);
}
 
void class_device_del(struct class_device *class_dev)
{
        struct class *parent_class = class_dev->class;
        struct class_device *parent_device = class_dev->parent;
        struct class_interface *class_intf;
 
        if (parent_class) {
                down(&parent_class->sem);
                list_del_init(&class_dev->node);
                list_for_each_entry(class_intf, &parent_class->interfaces, node)
                        if (class_intf->remove)
                                class_intf->remove(class_dev, class_intf);
                up(&parent_class->sem);
        }
 
        if (class_dev->dev) {
                remove_deprecated_class_device_links(class_dev);
                sysfs_remove_link(&class_dev->kobj, "device");
        }
        sysfs_remove_link(&class_dev->kobj, "subsystem");
        class_device_remove_file(class_dev, &class_uevent_attr);
        if (MAJOR(class_dev->devt))
                class_device_remove_file(class_dev, &class_devt_attr);
        class_device_remove_attrs(class_dev);
        class_device_remove_groups(class_dev);
 
        kobject_uevent(&class_dev->kobj, KOBJ_REMOVE);
        kobject_del(&class_dev->kobj);
 
        class_device_put(parent_device);
        class_put(parent_class);
}
 
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);
}
 
/**
 * class_device_destroy - removes a class device that was created with class_device_create()
 * @cls: the 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 class device that was created with a
 * call to class_device_create()
 */
void class_device_destroy(struct class *cls, dev_t devt)
{
        struct class_device *class_dev = NULL;
        struct class_device *class_dev_tmp;
 
        down(&cls->sem);
        list_for_each_entry(class_dev_tmp, &cls->children, node) {
                if (class_dev_tmp->devt == devt) {
                        class_dev = class_dev_tmp;
                        break;
                }
        }
        up(&cls->sem);
 
        if (class_dev)
                class_device_unregister(class_dev);
}
 
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)
{
        if (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 device *dev;
 
        if (!class_intf || !class_intf->class)
                return -ENODEV;
 
        parent = class_get(class_intf->class);
        if (!parent)
                return -EINVAL;
 
        down(&parent->sem);
        list_add_tail(&class_intf->node, &parent->interfaces);
        if (class_intf->add) {
                list_for_each_entry(class_dev, &parent->children, node)
                        class_intf->add(class_dev, class_intf);
        }
        if (class_intf->add_dev) {
                list_for_each_entry(dev, &parent->devices, node)
                        class_intf->add_dev(dev, class_intf);
        }
        up(&parent->sem);
 
        return 0;
}
 
void class_interface_unregister(struct class_interface *class_intf)
{
        struct class * parent = class_intf->class;
        struct class_device *class_dev;
        struct device *dev;
 
        if (!parent)
                return;
 
        down(&parent->sem);
        list_del_init(&class_intf->node);
        if (class_intf->remove) {
                list_for_each_entry(class_dev, &parent->children, node)
                        class_intf->remove(class_dev, class_intf);
        }
        if (class_intf->remove_dev) {
                list_for_each_entry(dev, &parent->devices, node)
                        class_intf->remove_dev(dev, class_intf);
        }
        up(&parent->sem);
 
        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... */
        kset_init(&class_obj_subsys);
        if (!class_obj_subsys.kobj.parent)
                class_obj_subsys.kobj.parent = &class_obj_subsys.kobj;
        return 0;
}
 
EXPORT_SYMBOL_GPL(class_create_file);
EXPORT_SYMBOL_GPL(class_remove_file);
EXPORT_SYMBOL_GPL(class_register);
EXPORT_SYMBOL_GPL(class_unregister);
EXPORT_SYMBOL_GPL(class_create);
EXPORT_SYMBOL_GPL(class_destroy);
 
EXPORT_SYMBOL_GPL(class_device_register);
EXPORT_SYMBOL_GPL(class_device_unregister);
EXPORT_SYMBOL_GPL(class_device_initialize);
EXPORT_SYMBOL_GPL(class_device_add);
EXPORT_SYMBOL_GPL(class_device_del);
EXPORT_SYMBOL_GPL(class_device_get);
EXPORT_SYMBOL_GPL(class_device_put);
EXPORT_SYMBOL_GPL(class_device_create);
EXPORT_SYMBOL_GPL(class_device_destroy);
EXPORT_SYMBOL_GPL(class_device_create_file);
EXPORT_SYMBOL_GPL(class_device_remove_file);
EXPORT_SYMBOL_GPL(class_device_create_bin_file);
EXPORT_SYMBOL_GPL(class_device_remove_bin_file);
 
EXPORT_SYMBOL_GPL(class_interface_register);
EXPORT_SYMBOL_GPL(class_interface_unregister);
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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [base/] [class.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* class.c - basic device class management`
3			`*`
4			`* Copyright (c) 2002-3 Patrick Mochel`
5			`* Copyright (c) 2002-3 Open Source Development Labs`
6			`* Copyright (c) 2003-2004 Greg Kroah-Hartman`
7			`* Copyright (c) 2003-2004 IBM Corp.`
8			`*`
9			`* This file is released under the GPLv2`
10			`*`
11			`*/`
12
13			`#include <linux/device.h>`
14			`#include <linux/module.h>`
15			`#include <linux/init.h>`
16			`#include <linux/string.h>`
17			`#include <linux/kdev_t.h>`
18			`#include <linux/err.h>`
19			`#include <linux/slab.h>`
20			`#include "base.h"`
21
22			`#define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)`
23			`#define to_class(obj) container_of(obj, struct class, subsys.kobj)`
24
25			`static ssize_t`
26			`class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)`
27			`{`
28			`struct class_attribute * class_attr = to_class_attr(attr);`
29			`struct class * dc = to_class(kobj);`
30			`ssize_t ret = -EIO;`
31
32			`if (class_attr->show)`
33			`ret = class_attr->show(dc, buf);`
34			`return ret;`
35			`}`
36
37			`static ssize_t`
38			`class_attr_store(struct kobject * kobj, struct attribute * attr,`
39			`const char * buf, size_t count)`
40			`{`