*
*/
-#include <linux/config.h>
#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 <linux/genhd.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)
+#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)
+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);
+ struct class_attribute *class_attr = to_class_attr(attr);
+ struct class *dc = to_class(kobj);
ssize_t ret = -EIO;
if (class_attr->show)
return ret;
}
-static ssize_t
-class_attr_store(struct kobject * kobj, struct attribute * attr,
- const char * buf, size_t count)
+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);
+ struct class_attribute *class_attr = to_class_attr(attr);
+ struct class *dc = to_class(kobj);
ssize_t ret = -EIO;
if (class_attr->store)
return ret;
}
-static void class_release(struct kobject * kobj)
+static void class_release(struct kobject *kobj)
{
struct class *class = to_class(kobj);
.store = class_attr_store,
};
-static struct kobj_type ktype_class = {
+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, &ktype_class, NULL);
+static struct kset *class_kset;
-int class_create_file(struct class * cls, const struct class_attribute * attr)
+int class_create_file(struct class *cls, const struct class_attribute *attr)
{
int error;
- if (cls) {
- error = sysfs_create_file(&cls->subsys.kset.kobj, &attr->attr);
- } else
+ 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)
+void class_remove_file(struct class *cls, const struct class_attribute *attr)
{
if (cls)
- sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr);
+ sysfs_remove_file(&cls->subsys.kobj, &attr->attr);
}
-struct class * class_get(struct class * cls)
+static struct class *class_get(struct class *cls)
{
if (cls)
- return container_of(subsys_get(&cls->subsys), struct class, subsys);
+ return container_of(kset_get(&cls->subsys),
+ struct class, subsys);
return NULL;
}
-void class_put(struct class * cls)
+static void class_put(struct class *cls)
{
- subsys_put(&cls->subsys);
+ if (cls)
+ kset_put(&cls->subsys);
}
-
-static int add_class_attrs(struct class * cls)
+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]);
+ error = class_create_file(cls, &cls->class_attrs[i]);
if (error)
- goto Err;
+ goto error;
}
}
- Done:
+done:
return error;
- Err:
+error:
while (--i >= 0)
- class_remove_file(cls,&cls->class_attrs[i]);
- goto Done;
+ class_remove_file(cls, &cls->class_attrs[i]);
+ goto done;
}
-static void remove_class_attrs(struct class * cls)
+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]);
+ class_remove_file(cls, &cls->class_attrs[i]);
}
}
-int class_register(struct class * cls)
+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.kset.kobj, "%s", cls->name);
+ error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name);
if (error)
return error;
- subsys_set_kset(cls, class_subsys);
+#if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK)
+ /* let the block class directory show up in the root of sysfs */
+ if (cls != &block_class)
+ cls->subsys.kobj.kset = class_kset;
+#else
+ cls->subsys.kobj.kset = class_kset;
+#endif
+ cls->subsys.kobj.ktype = &class_ktype;
- error = subsystem_register(&cls->subsys);
+ error = kset_register(&cls->subsys);
if (!error) {
error = add_class_attrs(class_get(cls));
class_put(cls);
return error;
}
-void class_unregister(struct class * cls)
+void class_unregister(struct class *cls)
{
pr_debug("device class '%s': unregistering\n", cls->name);
remove_class_attrs(cls);
- 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 = 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 (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);
- }
+ kset_unregister(&cls->subsys);
}
-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)
+static void class_create_release(struct class *cls)
{
- 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;
+ pr_debug("%s called for %s\n", __func__, cls->name);
+ kfree(cls);
}
-static const char *class_hotplug_name(struct kset *kset, struct kobject *kobj)
+/**
+ * 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 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_device *class_dev = to_class_dev(kobj);
-
- return class_dev->class->name;
-}
+ struct class *cls;
+ int retval;
-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 i = 0;
- int length = 0;
- int retval = 0;
-
- pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id);
-
- if (class_dev->dev) {
- /* add physical device, backing this device */
- struct device *dev = class_dev->dev;
- char *path = kobject_get_path(&dev->kobj, GFP_KERNEL);
-
- add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size,
- &length, "PHYSDEVPATH=%s", path);
- kfree(path);
-
- if (dev->bus)
- add_hotplug_env_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "PHYSDEVBUS=%s", dev->bus->name);
-
- if (dev->driver)
- add_hotplug_env_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "PHYSDEVDRIVER=%s", dev->driver->name);
+ cls = kzalloc(sizeof(*cls), GFP_KERNEL);
+ if (!cls) {
+ retval = -ENOMEM;
+ goto error;
}
- if (MAJOR(class_dev->devt)) {
- add_hotplug_env_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "MAJOR=%u", MAJOR(class_dev->devt));
+ cls->name = name;
+ cls->owner = owner;
+ cls->class_release = class_create_release;
- add_hotplug_env_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "MINOR=%u", MINOR(class_dev->devt));
- }
+ retval = class_register(cls);
+ if (retval)
+ goto error;
- /* terminate, set to next free slot, shrink available space */
- envp[i] = NULL;
- envp = &envp[i];
- num_envp -= i;
- buffer = &buffer[length];
- buffer_size -= length;
-
- 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 cls;
- return retval;
+error:
+ kfree(cls);
+ return ERR_PTR(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);
-
-
-static int class_device_add_attrs(struct class_device * cd)
+/**
+ * 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)
{
- int i;
- int error = 0;
- struct class * cls = cd->class;
+ if ((cls == NULL) || (IS_ERR(cls)))
+ return;
- 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;
+ class_unregister(cls);
}
-static void class_device_remove_attrs(struct class_device * cd)
+#ifdef CONFIG_SYSFS_DEPRECATED
+char *make_class_name(const char *name, struct kobject *kobj)
{
- int i;
- struct class * cls = cd->class;
+ char *class_name;
+ int size;
- 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]);
- }
-}
+ size = strlen(name) + strlen(kobject_name(kobj)) + 2;
-static ssize_t show_dev(struct class_device *class_dev, char *buf)
-{
- return print_dev_t(buf, class_dev->devt);
-}
-static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
+ class_name = kmalloc(size, GFP_KERNEL);
+ if (!class_name)
+ return NULL;
-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);
+ strcpy(class_name, name);
+ strcat(class_name, ":");
+ strcat(class_name, kobject_name(kobj));
+ return class_name;
}
+#endif
-int class_device_add(struct class_device *class_dev)
+/**
+ * class_for_each_device - device iterator
+ * @class: the class we're iterating
+ * @data: data for the callback
+ * @fn: function to be called for each device
+ *
+ * Iterate over @class's list of 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.
+ *
+ * Note, we hold class->sem in this function, so it can not be
+ * re-acquired in @fn, otherwise it will self-deadlocking. For
+ * example, calls to add or remove class members would be verboten.
+ */
+int class_for_each_device(struct class *class, void *data,
+ int (*fn)(struct device *, void *))
{
- struct class * parent = NULL;
- struct class_interface * class_intf;
- int error;
+ struct device *dev;
+ int error = 0;
- class_dev = class_device_get(class_dev);
- if (!class_dev)
+ if (!class)
return -EINVAL;
-
- if (!strlen(class_dev->class_id)) {
- error = -EINVAL;
- goto register_done;
+ down(&class->sem);
+ list_for_each_entry(dev, &class->devices, node) {
+ dev = get_device(dev);
+ if (dev) {
+ error = fn(dev, data);
+ put_device(dev);
+ } else
+ error = -ENODEV;
+ if (error)
+ break;
}
+ up(&class->sem);
- 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, "%s", 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(&parent->sem);
- list_add_tail(&class_dev->node, &parent->children);
- list_for_each_entry(class_intf, &parent->interfaces, node)
- if (class_intf->add)
- class_intf->add(class_dev);
- up(&parent->sem);
- }
-
- if (MAJOR(class_dev->devt))
- class_device_create_file(class_dev, &class_device_attr_dev);
-
- class_device_add_attrs(class_dev);
- if (class_dev->dev)
- sysfs_create_link(&class_dev->kobj,
- &class_dev->dev->kobj, "device");
-
- kobject_hotplug(&class_dev->kobj, KOBJ_ADD);
- register_done:
- if (error && parent)
- class_put(parent);
- class_device_put(class_dev);
return error;
}
+EXPORT_SYMBOL_GPL(class_for_each_device);
-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;
-
- if (parent) {
- down(&parent->sem);
- list_del_init(&class_dev->node);
- list_for_each_entry(class_intf, &parent->interfaces, node)
- if (class_intf->remove)
- class_intf->remove(class_dev);
- up(&parent->sem);
+/**
+ * class_find_device - device iterator for locating a particular device
+ * @class: the class we're iterating
+ * @data: data for the match function
+ * @match: function to check device
+ *
+ * This is similar to the class_for_each_dev() 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, this function will
+ * return to the caller and not iterate over any more devices.
+ *
+ * Note, you will need to drop the reference with put_device() after use.
+ *
+ * We hold class->sem in this function, so it can not be
+ * re-acquired in @match, otherwise it will self-deadlocking. For
+ * example, calls to add or remove class members would be verboten.
+ */
+struct device *class_find_device(struct class *class, void *data,
+ int (*match)(struct device *, void *))
+{
+ struct device *dev;
+ int found = 0;
+
+ if (!class)
+ return NULL;
+
+ down(&class->sem);
+ list_for_each_entry(dev, &class->devices, node) {
+ dev = get_device(dev);
+ if (dev) {
+ if (match(dev, data)) {
+ found = 1;
+ break;
+ } else
+ put_device(dev);
+ } else
+ break;
}
+ up(&class->sem);
- if (class_dev->dev)
- sysfs_remove_link(&class_dev->kobj, "device");
- class_device_remove_attrs(class_dev);
-
- kobject_hotplug(&class_dev->kobj, KOBJ_REMOVE);
- 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)
-{
- int error = 0;
-
- 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);
-
- strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);
-
- error = kobject_rename(&class_dev->kobj, new_name);
-
- class_device_put(class_dev);
-
- return error;
-}
-
-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);
+ return found ? dev : NULL;
}
-
+EXPORT_SYMBOL_GPL(class_find_device);
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;
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);
+ if (class_intf->add_dev) {
+ list_for_each_entry(dev, &parent->devices, node)
+ class_intf->add_dev(dev, class_intf);
}
up(&parent->sem);
void class_interface_unregister(struct class_interface *class_intf)
{
- struct class * parent = class_intf->class;
- struct class_device *class_dev;
+ struct class *parent = class_intf->class;
+ 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);
+ 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... */
- subsystem_init(&class_obj_subsys);
- if (!class_obj_subsys.kset.subsys)
- class_obj_subsys.kset.subsys = &class_obj_subsys;
+ class_kset = kset_create_and_add("class", NULL, NULL);
+ if (!class_kset)
+ return -ENOMEM;
return 0;
}
EXPORT_SYMBOL_GPL(class_remove_file);
EXPORT_SYMBOL_GPL(class_register);
EXPORT_SYMBOL_GPL(class_unregister);
-EXPORT_SYMBOL_GPL(class_get);
-EXPORT_SYMBOL_GPL(class_put);
-
-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_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_create);
+EXPORT_SYMBOL_GPL(class_destroy);
EXPORT_SYMBOL_GPL(class_interface_register);
EXPORT_SYMBOL_GPL(class_interface_unregister);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff