*
*/
-#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 <linux/mutex.h>
#include "base.h"
#define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
-#define to_class(obj) container_of(obj, struct class, subsys.kset.kobj)
-static ssize_t
-class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+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_private *cp = to_class(kobj);
ssize_t ret = -EIO;
if (class_attr->show)
- ret = class_attr->show(dc, buf);
+ ret = class_attr->show(cp->class, class_attr, buf);
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_private *cp = to_class(kobj);
ssize_t ret = -EIO;
if (class_attr->store)
- ret = class_attr->store(dc, buf, count);
+ ret = class_attr->store(cp->class, class_attr, buf, count);
return ret;
}
-static void class_release(struct kobject * kobj)
+static void class_release(struct kobject *kobj)
{
- struct class *class = to_class(kobj);
+ struct class_private *cp = to_class(kobj);
+ struct class *class = cp->class;
pr_debug("class '%s': release.\n", class->name);
else
pr_debug("class '%s' does not have a release() function, "
"be careful\n", class->name);
+
+ kfree(cp);
}
-static struct sysfs_ops class_sysfs_ops = {
+static const struct kobj_ns_type_operations *class_child_ns_type(struct kobject *kobj)
+{
+ struct class_private *cp = to_class(kobj);
+ struct class *class = cp->class;
+
+ return class->ns_type;
+}
+
+static const struct sysfs_ops class_sysfs_ops = {
.show = class_attr_show,
.store = class_attr_store,
};
-static struct kobj_type ktype_class = {
+static struct kobj_type class_ktype = {
.sysfs_ops = &class_sysfs_ops,
.release = class_release,
+ .child_ns_type = class_child_ns_type,
};
-/* Hotplug events for classes go to the class_obj subsys */
-static decl_subsys(class, &ktype_class, NULL);
+/* Hotplug events for classes go to the class class_subsys */
+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->p->class_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->p->class_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 NULL;
+ kset_get(&cls->p->class_subsys);
+ return cls;
}
-void class_put(struct class * cls)
+static void class_put(struct class *cls)
{
- subsys_put(&cls->subsys);
+ if (cls)
+ kset_put(&cls->p->class_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)
+static void klist_class_dev_get(struct klist_node *n)
{
+ struct device *dev = container_of(n, struct device, knode_class);
+
+ get_device(dev);
+}
+
+static void klist_class_dev_put(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_class);
+
+ put_device(dev);
+}
+
+int __class_register(struct class *cls, struct lock_class_key *key)
+{
+ struct class_private *cp;
int error;
pr_debug("device class '%s': registering\n", cls->name);
- INIT_LIST_HEAD(&cls->children);
- INIT_LIST_HEAD(&cls->interfaces);
- init_MUTEX(&cls->sem);
- error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name);
- if (error)
+ cp = kzalloc(sizeof(*cp), GFP_KERNEL);
+ if (!cp)
+ return -ENOMEM;
+ klist_init(&cp->class_devices, klist_class_dev_get, klist_class_dev_put);
+ INIT_LIST_HEAD(&cp->class_interfaces);
+ kset_init(&cp->class_dirs);
+ __mutex_init(&cp->class_mutex, "struct class mutex", key);
+ error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name);
+ if (error) {
+ kfree(cp);
return error;
+ }
- subsys_set_kset(cls, class_subsys);
-
- error = subsystem_register(&cls->subsys);
- if (!error) {
- error = add_class_attrs(class_get(cls));
- class_put(cls);
+ /* set the default /sys/dev directory for devices of this class */
+ if (!cls->dev_kobj)
+ cls->dev_kobj = sysfs_dev_char_kobj;
+
+#if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK)
+ /* let the block class directory show up in the root of sysfs */
+ if (cls != &block_class)
+ cp->class_subsys.kobj.kset = class_kset;
+#else
+ cp->class_subsys.kobj.kset = class_kset;
+#endif
+ cp->class_subsys.kobj.ktype = &class_ktype;
+ cp->class = cls;
+ cls->p = cp;
+
+ error = kset_register(&cp->class_subsys);
+ if (error) {
+ kfree(cp);
+ return error;
}
+ error = add_class_attrs(class_get(cls));
+ class_put(cls);
return error;
}
+EXPORT_SYMBOL_GPL(__class_register);
-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);
+ kset_unregister(&cls->p->class_subsys);
}
static void class_create_release(struct class *cls)
{
+ pr_debug("%s called for %s\n", __func__, cls->name);
kfree(cls);
}
-static void class_device_create_release(struct class_device *class_dev)
-{
- kfree(class_dev);
-}
-
/**
* 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.
+ * @key: the lock_class_key for this class; used by mutex lock debugging
*
* This is used to create a struct class pointer that can then be used
- * in calls to class_device_create().
+ * in calls to device_create().
+ *
+ * Returns &struct class pointer on success, or ERR_PTR() on error.
*
* 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, char *name)
+struct class *__class_create(struct module *owner, const char *name,
+ struct lock_class_key *key)
{
struct class *cls;
int retval;
- cls = kmalloc(sizeof(struct class), GFP_KERNEL);
+ cls = kzalloc(sizeof(*cls), GFP_KERNEL);
if (!cls) {
retval = -ENOMEM;
goto error;
}
- memset(cls, 0x00, sizeof(struct class));
cls->name = name;
cls->owner = owner;
cls->class_release = class_create_release;
- cls->release = class_device_create_release;
- retval = class_register(cls);
+ retval = __class_register(cls, key);
if (retval)
goto error;
kfree(cls);
return ERR_PTR(retval);
}
+EXPORT_SYMBOL_GPL(__class_create);
/**
* class_destroy - destroys a struct class structure
- * @cs: pointer to the struct class that is to be destroyed
+ * @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().
class_unregister(cls);
}
-/* Class Device Stuff */
-
-int class_device_create_file(struct class_device * class_dev,
- const struct class_device_attribute * attr)
+#ifdef CONFIG_SYSFS_DEPRECATED
+char *make_class_name(const char *name, struct kobject *kobj)
{
- int error = -EINVAL;
- if (class_dev)
- error = sysfs_create_file(&class_dev->kobj, &attr->attr);
- return error;
-}
+ char *class_name;
+ int size;
-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);
-}
+ size = strlen(name) + strlen(kobject_name(kobj)) + 2;
-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;
+ class_name = kmalloc(size, GFP_KERNEL);
+ if (!class_name)
+ return NULL;
- if (class_dev_attr->show)
- ret = class_dev_attr->show(cd, buf);
- return ret;
+ strcpy(class_name, name);
+ strcat(class_name, ":");
+ strcat(class_name, kobject_name(kobj));
+ return class_name;
}
+#endif
-static ssize_t
-class_device_attr_store(struct kobject * kobj, struct attribute * attr,
- const char * buf, size_t count)
+/**
+ * class_dev_iter_init - initialize class device iterator
+ * @iter: class iterator to initialize
+ * @class: the class we wanna iterate over
+ * @start: the device to start iterating from, if any
+ * @type: device_type of the devices to iterate over, NULL for all
+ *
+ * Initialize class iterator @iter such that it iterates over devices
+ * of @class. If @start is set, the list iteration will start there,
+ * otherwise if it is NULL, the iteration starts at the beginning of
+ * the list.
+ */
+void class_dev_iter_init(struct class_dev_iter *iter, struct class *class,
+ struct device *start, const struct device_type *type)
{
- struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr);
- struct class_device * cd = to_class_dev(kobj);
- ssize_t ret = 0;
+ struct klist_node *start_knode = NULL;
- if (class_dev_attr->store)
- ret = class_dev_attr->store(cd, buf, count);
- return ret;
+ if (start)
+ start_knode = &start->knode_class;
+ klist_iter_init_node(&class->p->class_devices, &iter->ki, start_knode);
+ iter->type = type;
}
+EXPORT_SYMBOL_GPL(class_dev_iter_init);
-static struct sysfs_ops class_dev_sysfs_ops = {
- .show = class_device_attr_show,
- .store = class_device_attr_store,
-};
-
-static void class_dev_release(struct kobject * kobj)
-{
- struct class_device *cd = to_class_dev(kobj);
- struct class * cls = cd->class;
-
- pr_debug("device class '%s': release.\n", cd->class_id);
-
- if (cls->release)
- cls->release(cd);
- else {
- printk(KERN_ERR "Device class '%s' does not have a release() function, "
- "it is broken and must be fixed.\n",
- cd->class_id);
- WARN_ON(1);
- }
-}
-
-static struct kobj_type ktype_class_device = {
- .sysfs_ops = &class_dev_sysfs_ops,
- .release = class_dev_release,
-};
-
-static int class_hotplug_filter(struct kset *kset, struct kobject *kobj)
-{
- struct kobj_type *ktype = get_ktype(kobj);
-
- if (ktype == &ktype_class_device) {
- struct class_device *class_dev = to_class_dev(kobj);
- if (class_dev->class)
- return 1;
+/**
+ * class_dev_iter_next - iterate to the next device
+ * @iter: class iterator to proceed
+ *
+ * Proceed @iter to the next device and return it. Returns NULL if
+ * iteration is complete.
+ *
+ * The returned device is referenced and won't be released till
+ * iterator is proceed to the next device or exited. The caller is
+ * free to do whatever it wants to do with the device including
+ * calling back into class code.
+ */
+struct device *class_dev_iter_next(struct class_dev_iter *iter)
+{
+ struct klist_node *knode;
+ struct device *dev;
+
+ while (1) {
+ knode = klist_next(&iter->ki);
+ if (!knode)
+ return NULL;
+ dev = container_of(knode, struct device, knode_class);
+ if (!iter->type || iter->type == dev->type)
+ return dev;
}
- return 0;
}
+EXPORT_SYMBOL_GPL(class_dev_iter_next);
-static const char *class_hotplug_name(struct kset *kset, struct kobject *kobj)
+/**
+ * class_dev_iter_exit - finish iteration
+ * @iter: class iterator to finish
+ *
+ * Finish an iteration. Always call this function after iteration is
+ * complete whether the iteration ran till the end or not.
+ */
+void class_dev_iter_exit(struct class_dev_iter *iter)
{
- struct class_device *class_dev = to_class_dev(kobj);
-
- return class_dev->class->name;
+ klist_iter_exit(&iter->ki);
}
+EXPORT_SYMBOL_GPL(class_dev_iter_exit);
-static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp,
- int num_envp, char *buffer, int buffer_size)
+/**
+ * class_for_each_device - device iterator
+ * @class: the class we're iterating
+ * @start: the device to start with in the list, if any.
+ * @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. If @start is set, the list iteration will start
+ * there, otherwise if it is NULL, the iteration starts at the
+ * beginning of the list.
+ *
+ * We check the return of @fn each time. If it returns anything
+ * other than 0, we break out and return that value.
+ *
+ * @fn is allowed to do anything including calling back into class
+ * code. There's no locking restriction.
+ */
+int class_for_each_device(struct class *class, struct device *start,
+ void *data, int (*fn)(struct device *, void *))
{
- 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);
- }
-
- if (MAJOR(class_dev->devt)) {
- add_hotplug_env_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "MAJOR=%u", MAJOR(class_dev->devt));
+ struct class_dev_iter iter;
+ struct device *dev;
+ int error = 0;
- add_hotplug_env_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "MINOR=%u", MINOR(class_dev->devt));
+ if (!class)
+ return -EINVAL;
+ if (!class->p) {
+ WARN(1, "%s called for class '%s' before it was initialized",
+ __func__, class->name);
+ return -EINVAL;
}
- /* 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);
- }
+ class_dev_iter_init(&iter, class, start, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
+ error = fn(dev, data);
+ if (error)
+ break;
}
+ class_dev_iter_exit(&iter);
- return retval;
-}
-
-static struct kset_hotplug_ops class_hotplug_ops = {
- .filter = class_hotplug_filter,
- .name = class_hotplug_name,
- .hotplug = class_hotplug,
-};
-
-static decl_subsys(class_obj, &ktype_class_device, &class_hotplug_ops);
-
-
-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;
}
+EXPORT_SYMBOL_GPL(class_for_each_device);
-static void class_device_remove_attrs(struct class_device * cd)
-{
- int i;
- struct class * cls = cd->class;
+/**
+ * class_find_device - device iterator for locating a particular device
+ * @class: the class we're iterating
+ * @start: Device to begin with
+ * @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.
+ *
+ * @fn is allowed to do anything including calling back into class
+ * code. There's no locking restriction.
+ */
+struct device *class_find_device(struct class *class, struct device *start,
+ void *data,
+ int (*match)(struct device *, void *))
+{
+ struct class_dev_iter iter;
+ struct device *dev;
+
+ if (!class)
+ return NULL;
+ if (!class->p) {
+ WARN(1, "%s called for class '%s' before it was initialized",
+ __func__, class->name);
+ return NULL;
+ }
- 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]);
+ class_dev_iter_init(&iter, class, start, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
+ if (match(dev, data)) {
+ get_device(dev);
+ break;
+ }
}
-}
+ class_dev_iter_exit(&iter);
-static ssize_t show_dev(struct class_device *class_dev, char *buf)
-{
- return print_dev_t(buf, class_dev->devt);
+ return dev;
}
+EXPORT_SYMBOL_GPL(class_find_device);
-void class_device_initialize(struct class_device *class_dev)
+int class_interface_register(struct class_interface *class_intf)
{
- kobj_set_kset_s(class_dev, class_obj_subsys);
- kobject_init(&class_dev->kobj);
- INIT_LIST_HEAD(&class_dev->node);
-}
+ struct class *parent;
+ struct class_dev_iter iter;
+ struct device *dev;
-int class_device_add(struct class_device *class_dev)
-{
- struct class * parent = NULL;
- struct class_interface * class_intf;
- int error;
+ if (!class_intf || !class_intf->class)
+ return -ENODEV;
- class_dev = class_device_get(class_dev);
- if (!class_dev)
+ parent = class_get(class_intf->class);
+ if (!parent)
return -EINVAL;
- if (!strlen(class_dev->class_id)) {
- error = -EINVAL;
- goto register_done;
- }
-
- 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;
-
- /* add the needed attributes to this device */
- if (MAJOR(class_dev->devt)) {
- struct class_device_attribute *attr;
- attr = kmalloc(sizeof(*attr), GFP_KERNEL);
- if (!attr) {
- error = -ENOMEM;
- kobject_del(&class_dev->kobj);
- goto register_done;
- }
- memset(attr, sizeof(*attr), 0x00);
- attr->attr.name = "dev";
- attr->attr.mode = S_IRUGO;
- attr->attr.owner = parent->owner;
- attr->show = show_dev;
- attr->store = NULL;
- class_device_create_file(class_dev, attr);
- class_dev->devt_attr = attr;
+ mutex_lock(&parent->p->class_mutex);
+ list_add_tail(&class_intf->node, &parent->p->class_interfaces);
+ if (class_intf->add_dev) {
+ class_dev_iter_init(&iter, parent, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter)))
+ class_intf->add_dev(dev, class_intf);
+ class_dev_iter_exit(&iter);
}
+ mutex_unlock(&parent->p->class_mutex);
- class_device_add_attrs(class_dev);
- if (class_dev->dev)
- sysfs_create_link(&class_dev->kobj,
- &class_dev->dev->kobj, "device");
-
- /* notify any interfaces this device is now here */
- 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);
- }
- kobject_hotplug(&class_dev->kobj, KOBJ_ADD);
-
- register_done:
- if (error && parent)
- class_put(parent);
- class_device_put(class_dev);
- return error;
-}
-
-int class_device_register(struct class_device *class_dev)
-{
- class_device_initialize(class_dev);
- return class_device_add(class_dev);
+ return 0;
}
-/**
- * class_device_create - creates a class device and registers it with sysfs
- * @cs: pointer to the struct class that this device should be registered to.
- * @dev: 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. 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, dev_t devt,
- struct device *device, char *fmt, ...)
+void class_interface_unregister(struct class_interface *class_intf)
{
- va_list args;
- struct class_device *class_dev = NULL;
- int retval = -ENODEV;
+ struct class *parent = class_intf->class;
+ struct class_dev_iter iter;
+ struct device *dev;
- if (cls == NULL || IS_ERR(cls))
- goto error;
+ if (!parent)
+ return;
- class_dev = kmalloc(sizeof(struct class_device), GFP_KERNEL);
- if (!class_dev) {
- retval = -ENOMEM;
- goto error;
+ mutex_lock(&parent->p->class_mutex);
+ list_del_init(&class_intf->node);
+ if (class_intf->remove_dev) {
+ class_dev_iter_init(&iter, parent, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter)))
+ class_intf->remove_dev(dev, class_intf);
+ class_dev_iter_exit(&iter);
}
- memset(class_dev, 0x00, sizeof(struct class_device));
-
- class_dev->devt = devt;
- class_dev->dev = device;
- class_dev->class = cls;
+ mutex_unlock(&parent->p->class_mutex);
- 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);
+ class_put(parent);
}
-void class_device_del(struct class_device *class_dev)
+ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
+ char *buf)
{
- 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);
- }
-
- if (class_dev->dev)
- sysfs_remove_link(&class_dev->kobj, "device");
- if (class_dev->devt_attr) {
- class_device_remove_file(class_dev, class_dev->devt_attr);
- kfree(class_dev->devt_attr);
- class_dev->devt_attr = NULL;
- }
- class_device_remove_attrs(class_dev);
-
- kobject_hotplug(&class_dev->kobj, KOBJ_REMOVE);
- kobject_del(&class_dev->kobj);
-
- if (parent)
- class_put(parent);
+ struct class_attribute_string *cs;
+ cs = container_of(attr, struct class_attribute_string, attr);
+ return snprintf(buf, PAGE_SIZE, "%s\n", cs->str);
}
-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);
-}
+EXPORT_SYMBOL_GPL(show_class_attr_string);
+
+struct class_compat {
+ struct kobject *kobj;
+};
/**
- * 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.
- * @dev: the dev_t of the device that was previously registered.
+ * class_compat_register - register a compatibility class
+ * @name: the name of the class
*
- * This call unregisters and cleans up a class device that was created with a
- * call to class_device_create()
+ * Compatibility class are meant as a temporary user-space compatibility
+ * workaround when converting a family of class devices to a bus devices.
*/
-void class_device_destroy(struct class *cls, dev_t devt)
+struct class_compat *class_compat_register(const char *name)
{
- struct class_device *class_dev = NULL;
- struct class_device *class_dev_tmp;
+ struct class_compat *cls;
- 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;
- }
+ cls = kmalloc(sizeof(struct class_compat), GFP_KERNEL);
+ if (!cls)
+ return NULL;
+ cls->kobj = kobject_create_and_add(name, &class_kset->kobj);
+ if (!cls->kobj) {
+ kfree(cls);
+ return NULL;
}
- up(&cls->sem);
-
- if (class_dev)
- class_device_unregister(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;
+ return cls;
}
+EXPORT_SYMBOL_GPL(class_compat_register);
-void class_device_put(struct class_device *class_dev)
+/**
+ * class_compat_unregister - unregister a compatibility class
+ * @cls: the class to unregister
+ */
+void class_compat_unregister(struct class_compat *cls)
{
- kobject_put(&class_dev->kobj);
+ kobject_put(cls->kobj);
+ kfree(cls);
}
+EXPORT_SYMBOL_GPL(class_compat_unregister);
-
-int class_interface_register(struct class_interface *class_intf)
+/**
+ * class_compat_create_link - create a compatibility class device link to
+ * a bus device
+ * @cls: the compatibility class
+ * @dev: the target bus device
+ * @device_link: an optional device to which a "device" link should be created
+ */
+int class_compat_create_link(struct class_compat *cls, struct device *dev,
+ struct device *device_link)
{
- struct class *parent;
- struct class_device *class_dev;
-
- if (!class_intf || !class_intf->class)
- return -ENODEV;
+ int error;
- parent = class_get(class_intf->class);
- if (!parent)
- return -EINVAL;
+ error = sysfs_create_link(cls->kobj, &dev->kobj, dev_name(dev));
+ if (error)
+ return error;
- 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);
+ /*
+ * Optionally add a "device" link (typically to the parent), as a
+ * class device would have one and we want to provide as much
+ * backwards compatibility as possible.
+ */
+ if (device_link) {
+ error = sysfs_create_link(&dev->kobj, &device_link->kobj,
+ "device");
+ if (error)
+ sysfs_remove_link(cls->kobj, dev_name(dev));
}
- up(&parent->sem);
- return 0;
+ return error;
}
+EXPORT_SYMBOL_GPL(class_compat_create_link);
-void class_interface_unregister(struct class_interface *class_intf)
+/**
+ * class_compat_remove_link - remove a compatibility class device link to
+ * a bus device
+ * @cls: the compatibility class
+ * @dev: the target bus device
+ * @device_link: an optional device to which a "device" link was previously
+ * created
+ */
+void class_compat_remove_link(struct class_compat *cls, struct device *dev,
+ struct device *device_link)
{
- struct class * parent = class_intf->class;
- struct class_device *class_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);
- }
- up(&parent->sem);
-
- class_put(parent);
+ if (device_link)
+ sysfs_remove_link(&dev->kobj, "device");
+ sysfs_remove_link(cls->kobj, dev_name(dev));
}
-
-
+EXPORT_SYMBOL_GPL(class_compat_remove_link);
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_create_file);
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_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);