#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 <linux/pm_runtime.h>
#include "base.h"
#include "power/power.h"
+#ifdef CONFIG_SYSFS_DEPRECATED
+#ifdef CONFIG_SYSFS_DEPRECATED_V2
+long sysfs_deprecated = 1;
+#else
+long sysfs_deprecated = 0;
+#endif
+static __init int sysfs_deprecated_setup(char *arg)
+{
+ return strict_strtol(arg, 10, &sysfs_deprecated);
+}
+early_param("sysfs.deprecated", sysfs_deprecated_setup);
+#endif
+
int (*platform_notify)(struct device *dev) = NULL;
int (*platform_notify_remove)(struct device *dev) = NULL;
static struct kobject *dev_kobj;
*/
const char *dev_driver_string(const struct device *dev)
{
- return dev->driver ? dev->driver->name :
+ struct device_driver *drv;
+
+ /* dev->driver can change to NULL underneath us because of unbinding,
+ * so be careful about accessing it. dev->bus and dev->class should
+ * never change once they are set, so they don't need special care.
+ */
+ drv = ACCESS_ONCE(dev->driver);
+ return drv ? drv->name :
(dev->bus ? dev->bus->name :
(dev->class ? dev->class->name : ""));
}
return ret;
}
-static struct sysfs_ops dev_sysfs_ops = {
+static const struct sysfs_ops dev_sysfs_ops = {
.show = dev_attr_show,
.store = dev_attr_store,
};
kfree(p);
}
+static const void *device_namespace(struct kobject *kobj)
+{
+ struct device *dev = to_dev(kobj);
+ const void *ns = NULL;
+
+ if (dev->class && dev->class->ns_type)
+ ns = dev->class->namespace(dev);
+
+ return ns;
+}
+
static struct kobj_type device_ktype = {
.release = device_release,
.sysfs_ops = &dev_sysfs_ops,
+ .namespace = device_namespace,
};
if (ktype == &device_ktype) {
struct device *dev = to_dev(kobj);
- if (dev->uevent_suppress)
- return 0;
if (dev->bus)
return 1;
if (dev->class)
struct device *dev = to_dev(kobj);
int retval = 0;
- /* add the major/minor if present */
+ /* 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)
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);
__func__, retval);
}
- /* have the device type specific fuction add its stuff */
+ /* have the device type specific function add its stuff */
if (dev->type && dev->type->uevent) {
retval = dev->type->uevent(dev, env);
if (retval)
return retval;
}
-static struct kset_uevent_ops device_uevent_ops = {
+static const struct kset_uevent_ops device_uevent_ops = {
.filter = dev_uevent_filter,
.name = dev_uevent_name,
.uevent = dev_uevent,
{
enum kobject_action action;
- if (kobject_action_type(buf, count, &action) == 0) {
+ 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:
+ else
+ dev_err(dev, "uevent: unknown action-string\n");
return count;
}
device_remove_file(dev, &attrs[i]);
}
+static int device_add_bin_attributes(struct device *dev,
+ struct bin_attribute *attrs)
+{
+ int error = 0;
+ int i;
+
+ if (attrs) {
+ for (i = 0; attr_name(attrs[i]); i++) {
+ error = device_create_bin_file(dev, &attrs[i]);
+ if (error)
+ break;
+ }
+ if (error)
+ while (--i >= 0)
+ device_remove_bin_file(dev, &attrs[i]);
+ }
+ return error;
+}
+
+static void device_remove_bin_attributes(struct device *dev,
+ struct bin_attribute *attrs)
+{
+ int i;
+
+ if (attrs)
+ for (i = 0; attr_name(attrs[i]); i++)
+ device_remove_bin_file(dev, &attrs[i]);
+}
+
static int device_add_groups(struct device *dev,
- struct attribute_group **groups)
+ const struct attribute_group **groups)
{
int error = 0;
int i;
}
static void device_remove_groups(struct device *dev,
- struct attribute_group **groups)
+ const struct attribute_group **groups)
{
int i;
static int device_add_attrs(struct device *dev)
{
struct class *class = dev->class;
- struct device_type *type = dev->type;
+ const struct device_type *type = dev->type;
int error;
if (class) {
error = device_add_attributes(dev, class->dev_attrs);
if (error)
return error;
+ error = device_add_bin_attributes(dev, class->dev_bin_attrs);
+ if (error)
+ goto err_remove_class_attrs;
}
if (type) {
error = device_add_groups(dev, type->groups);
if (error)
- goto err_remove_class_attrs;
+ goto err_remove_class_bin_attrs;
}
error = device_add_groups(dev, dev->groups);
err_remove_type_groups:
if (type)
device_remove_groups(dev, type->groups);
+ err_remove_class_bin_attrs:
+ if (class)
+ device_remove_bin_attributes(dev, class->dev_bin_attrs);
err_remove_class_attrs:
if (class)
device_remove_attributes(dev, class->dev_attrs);
static void device_remove_attrs(struct device *dev)
{
struct class *class = dev->class;
- struct device_type *type = dev->type;
+ const struct device_type *type = dev->type;
device_remove_groups(dev, dev->groups);
if (type)
device_remove_groups(dev, type->groups);
- if (class)
+ if (class) {
device_remove_attributes(dev, class->dev_attrs);
+ device_remove_bin_attributes(dev, class->dev_bin_attrs);
+ }
}
* @dev: device.
* @attr: device attribute descriptor.
*/
-int device_create_file(struct device *dev, struct device_attribute *attr)
+int device_create_file(struct device *dev,
+ const struct device_attribute *attr)
{
int error = 0;
if (dev)
* @dev: device.
* @attr: device attribute descriptor.
*/
-void device_remove_file(struct device *dev, struct device_attribute *attr)
+void device_remove_file(struct device *dev,
+ const struct device_attribute *attr)
{
if (dev)
sysfs_remove_file(&dev->kobj, &attr->attr);
* @dev: device.
* @attr: device binary attribute descriptor.
*/
-int device_create_bin_file(struct device *dev, struct bin_attribute *attr)
+int device_create_bin_file(struct device *dev,
+ const struct bin_attribute *attr)
{
int error = -EINVAL;
if (dev)
* @dev: device.
* @attr: device binary attribute descriptor.
*/
-void device_remove_bin_file(struct device *dev, struct bin_attribute *attr)
+void device_remove_bin_file(struct device *dev,
+ const struct bin_attribute *attr)
{
if (dev)
sysfs_remove_bin_file(&dev->kobj, attr);
*/
void device_initialize(struct device *dev)
{
- dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
- if (!dev->p) {
- WARN_ON(1);
- return;
- }
- dev->p->device = dev;
dev->kobj.kset = devices_kset;
kobject_init(&dev->kobj, &device_ktype);
- klist_init(&dev->p->klist_children, klist_children_get,
- klist_children_put);
INIT_LIST_HEAD(&dev->dma_pools);
- init_MUTEX(&dev->sem);
+ mutex_init(&dev->mutex);
+ lockdep_set_novalidate_class(&dev->mutex);
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;
return virtual_dir;
}
-static struct kobject *get_device_parent(struct device *dev,
- struct device *parent)
+struct class_dir {
+ struct kobject kobj;
+ struct class *class;
+};
+
+#define to_class_dir(obj) container_of(obj, struct class_dir, kobj)
+
+static void class_dir_release(struct kobject *kobj)
+{
+ struct class_dir *dir = to_class_dir(kobj);
+ kfree(dir);
+}
+
+static const
+struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj)
+{
+ struct class_dir *dir = to_class_dir(kobj);
+ return dir->class->ns_type;
+}
+
+static struct kobj_type class_dir_ktype = {
+ .release = class_dir_release,
+ .sysfs_ops = &kobj_sysfs_ops,
+ .child_ns_type = class_dir_child_ns_type
+};
+
+static struct kobject *
+class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
{
+ struct class_dir *dir;
int retval;
+ dir = kzalloc(sizeof(*dir), GFP_KERNEL);
+ if (!dir)
+ return NULL;
+
+ dir->class = class;
+ kobject_init(&dir->kobj, &class_dir_ktype);
+
+ dir->kobj.kset = &class->p->glue_dirs;
+
+ retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name);
+ if (retval < 0) {
+ kobject_put(&dir->kobj);
+ return NULL;
+ }
+ return &dir->kobj;
+}
+
+
+static struct kobject *get_device_parent(struct device *dev,
+ struct device *parent)
+{
if (dev->class) {
+ static DEFINE_MUTEX(gdp_mutex);
struct kobject *kobj = NULL;
struct kobject *parent_kobj;
struct kobject *k;
+#ifdef CONFIG_BLOCK
+ /* block disks show up in /sys/block */
+ if (sysfs_deprecated && dev->class == &block_class) {
+ if (parent && parent->class == &block_class)
+ return &parent->kobj;
+ return &block_class.p->subsys.kobj;
+ }
+#endif
+
/*
* If we have no parent, we live in "virtual".
* Class-devices with a non class-device as parent, live
*/
if (parent == NULL)
parent_kobj = virtual_device_parent(dev);
- else if (parent->class)
+ else if (parent->class && !dev->class->ns_type)
return &parent->kobj;
else
parent_kobj = &parent->kobj;
+ mutex_lock(&gdp_mutex);
+
/* 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)
+ spin_lock(&dev->class->p->glue_dirs.list_lock);
+ list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry)
if (k->parent == parent_kobj) {
kobj = kobject_get(k);
break;
}
- spin_unlock(&dev->class->p->class_dirs.list_lock);
- if (kobj)
+ spin_unlock(&dev->class->p->glue_dirs.list_lock);
+ if (kobj) {
+ mutex_unlock(&gdp_mutex);
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;
- }
+ k = class_dir_create_and_add(dev->class, parent_kobj);
/* do not emit an uevent for this simple "glue" directory */
+ mutex_unlock(&gdp_mutex);
return k;
}
{
/* see if we live in a "glue" directory */
if (!glue_dir || !dev->class ||
- glue_dir->kset != &dev->class->p->class_dirs)
+ glue_dir->kset != &dev->class->p->glue_dirs)
return;
kobject_put(glue_dir);
{
cleanup_glue_dir(dev, dev->kobj.parent);
}
-#endif
static void setup_parent(struct device *dev, struct device *parent)
{
return 0;
error = sysfs_create_link(&dev->kobj,
- &dev->class->p->class_subsys.kobj,
+ &dev->class->p->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,
+ error = sysfs_create_link(&dev->kobj, &dev->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;
+ goto out_subsys;
}
- 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
+#ifdef CONFIG_BLOCK
+ /* /sys/block has directories and does not need symlinks */
+ if (sysfs_deprecated && dev->class == &block_class)
+ return 0;
+#endif
+
/* link in the class directory pointing to the device */
- error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
+ error = sysfs_create_link(&dev->class->p->subsys.kobj,
&dev->kobj, dev_name(dev));
if (error)
- goto out_subsys;
+ goto out_device;
- 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_device:
+ sysfs_remove_link(&dev->kobj, "device");
out_subsys:
sysfs_remove_link(&dev->kobj, "subsystem");
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");
+#ifdef CONFIG_BLOCK
+ if (sysfs_deprecated && dev->class == &block_class)
+ return;
+#endif
+ sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev));
}
/**
int dev_set_name(struct device *dev, const char *fmt, ...)
{
va_list vargs;
+ int err;
va_start(vargs, fmt);
- vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs);
+ err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
va_end(vargs);
- return 0;
+ return err;
}
EXPORT_SYMBOL_GPL(dev_set_name);
}
}
+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.
if (!dev)
goto done;
- /* Temporarily support init_name if it is set.
- * It will override bus_id for now */
- if (dev->init_name)
+ 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 (!strlen(dev->bus_id))
- goto done;
+ if (!dev_name(dev)) {
+ error = -EINVAL;
+ goto name_error;
+ }
pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
set_dev_node(dev, dev_to_node(parent));
/* first, register with generic layer. */
- error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev_name(dev));
+ /* we require the name to be set before, and pass NULL */
+ error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
if (error)
goto Error;
if (platform_notify)
platform_notify(dev);
- /* notify clients of device entry (new way) */
- if (dev->bus)
- blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
- BUS_NOTIFY_ADD_DEVICE, dev);
-
error = device_create_file(dev, &uevent_attr);
if (error)
goto attrError;
error = device_create_sys_dev_entry(dev);
if (error)
goto devtattrError;
+
+ devtmpfs_create_node(dev);
}
error = device_add_class_symlinks(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_attach_device(dev);
+ bus_probe_device(dev);
if (parent)
klist_add_tail(&dev->p->knode_parent,
&parent->p->klist_children);
mutex_lock(&dev->class->p->class_mutex);
/* tie the class to the device */
klist_add_tail(&dev->knode_class,
- &dev->class->p->class_devices);
+ &dev->class->p->klist_devices);
/* notify any interfaces that the device is here */
list_for_each_entry(class_intf,
DPMError:
bus_remove_device(dev);
BusError:
- if (dev->bus)
- blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
- BUS_NOTIFY_DEL_DEVICE, dev);
device_remove_attrs(dev);
AttrsError:
device_remove_class_symlinks(dev);
SymlinkError:
+ if (MAJOR(dev->devt))
+ devtmpfs_delete_node(dev);
if (MAJOR(dev->devt))
device_remove_sys_dev_entry(dev);
devtattrError:
cleanup_device_parent(dev);
if (parent)
put_device(parent);
+name_error:
+ kfree(dev->p);
+ dev->p = NULL;
goto done;
}
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 (platform_notify_remove)
platform_notify_remove(dev);
- if (dev->bus)
- blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
- BUS_NOTIFY_DEL_DEVICE, dev);
kobject_uevent(&dev->kobj, KOBJ_REMOVE);
cleanup_device_parent(dev);
kobject_del(&dev->kobj);
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.
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);
EXPORT_SYMBOL_GPL(device_create_file);
EXPORT_SYMBOL_GPL(device_remove_file);
+struct root_device {
+ struct device dev;
+ struct module *owner;
+};
+
+inline struct root_device *to_root_device(struct device *d)
+{
+ return container_of(d, 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.
+ *
+ * Returns &struct device pointer on success, or ERR_PTR() on error.
+ *
+ * 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_MODULES /* 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)
{
* Any further sysfs files that might be required can be created using this
* pointer.
*
+ * Returns &struct device pointer on success, or ERR_PTR() on error.
+ *
* Note: the struct class passed to this function must have previously
* been created with a call to class_create().
*/
dev->release = device_create_release;
dev_set_drvdata(dev, drvdata);
- vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
+ retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
+ if (retval)
+ goto error;
+
retval = device_register(dev);
if (retval)
goto error;
* Any further sysfs files that might be required can be created using this
* pointer.
*
+ * Returns &struct device pointer on success, or ERR_PTR() on error.
+ *
* Note: the struct class passed to this function must have previously
* been created with a call to class_create().
*/
* 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.
+ *
+ * Note: Don't call this function. Currently, the networking layer calls this
+ * function, but that will change. The following text from Kay Sievers offers
+ * some insight:
+ *
+ * Renaming devices is racy at many levels, symlinks and other stuff are not
+ * replaced atomically, and you get a "move" uevent, but it's not easy to
+ * connect the event to the old and new device. Device nodes are not renamed at
+ * all, there isn't even support for that in the kernel now.
+ *
+ * In the meantime, during renaming, your target name might be taken by another
+ * driver, creating conflicts. Or the old name is taken directly after you
+ * renamed it -- then you get events for the same DEVPATH, before you even see
+ * the "move" event. It's just a mess, and nothing new should ever rely on
+ * kernel device renaming. Besides that, it's not even implemented now for
+ * other things than (driver-core wise very simple) network devices.
+ *
+ * We are currently about to change network renaming in udev to completely
+ * disallow renaming of devices in the same namespace as the kernel uses,
+ * because we can't solve the problems properly, that arise with swapping names
+ * of multiple interfaces without races. Means, renaming of eth[0-9]* will only
+ * be allowed to some other name than eth[0-9]*, for the aforementioned
+ * reasons.
+ *
+ * Make up a "real" name in the driver before you register anything, or add
+ * some other attributes for userspace to find the device, or use udev to add
+ * symlinks -- but never rename kernel devices later, it's a complete mess. We
+ * don't even want to get into that and try to implement the missing pieces in
+ * the core. We really have other pieces to fix in the driver core mess. :)
*/
-int device_rename(struct device *dev, char *new_name)
+int device_rename(struct device *dev, const char *new_name)
{
char *old_class_name = NULL;
char *new_class_name = NULL;
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 = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
+ old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
if (!old_device_name) {
error = -ENOMEM;
goto out;
}
- strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE);
- strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
- error = kobject_rename(&dev->kobj, new_name);
- if (error) {
- strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE);
- 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));
+ error = sysfs_rename_link(&dev->class->p->subsys.kobj,
+ &dev->kobj, old_device_name, new_name);
if (error)
goto out;
- sysfs_remove_link(&dev->class->p->class_subsys.kobj,
- old_device_name);
}
-#endif
+
+ error = kobject_rename(&dev->kobj, new_name);
+ if (error)
+ goto out;
out:
put_device(dev);
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)
+int device_move(struct device *dev, struct device *new_parent,
+ enum dpm_order dpm_order)
{
int error;
struct device *old_parent;
if (!dev)
return -EINVAL;
+ device_pm_lock();
new_parent = get_device(new_parent);
new_parent_kobj = get_device_parent(dev, new_parent);
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;
}
*/
void device_shutdown(void)
{
- struct device *dev, *devn;
+ struct device *dev;
+
+ spin_lock(&devices_kset->list_lock);
+ /*
+ * Walk the devices list backward, shutting down each in turn.
+ * Beware that device unplug events may also start pulling
+ * devices offline, even as the system is shutting down.
+ */
+ while (!list_empty(&devices_kset->list)) {
+ dev = list_entry(devices_kset->list.prev, struct device,
+ kobj.entry);
+ get_device(dev);
+ /*
+ * Make sure the device is off the kset list, in the
+ * event that dev->*->shutdown() doesn't remove it.
+ */
+ list_del_init(&dev->kobj.entry);
+ spin_unlock(&devices_kset->list_lock);
+ /* Disable all device's runtime power management */
+ pm_runtime_disable(dev);
- 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);
dev_dbg(dev, "shutdown\n");
dev->driver->shutdown(dev);
}
+ put_device(dev);
+
+ spin_lock(&devices_kset->list_lock);
}
- kobject_put(sysfs_dev_char_kobj);
- kobject_put(sysfs_dev_block_kobj);
- kobject_put(dev_kobj);
+ spin_unlock(&devices_kset->list_lock);
+ async_synchronize_full();
+}
+
+/*
+ * Device logging functions
+ */
+
+#ifdef CONFIG_PRINTK
+
+static int __dev_printk(const char *level, const struct device *dev,
+ struct va_format *vaf)
+{
+ if (!dev)
+ return printk("%s(NULL device *): %pV", level, vaf);
+
+ return printk("%s%s %s: %pV",
+ level, dev_driver_string(dev), dev_name(dev), vaf);
+}
+
+int dev_printk(const char *level, const struct device *dev,
+ const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+ int r;
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ r = __dev_printk(level, dev, &vaf);
+ va_end(args);
+
+ return r;
}
+EXPORT_SYMBOL(dev_printk);
+
+#define define_dev_printk_level(func, kern_level) \
+int func(const struct device *dev, const char *fmt, ...) \
+{ \
+ struct va_format vaf; \
+ va_list args; \
+ int r; \
+ \
+ va_start(args, fmt); \
+ \
+ vaf.fmt = fmt; \
+ vaf.va = &args; \
+ \
+ r = __dev_printk(kern_level, dev, &vaf); \
+ va_end(args); \
+ \
+ return r; \
+} \
+EXPORT_SYMBOL(func);
+
+define_dev_printk_level(dev_emerg, KERN_EMERG);
+define_dev_printk_level(dev_alert, KERN_ALERT);
+define_dev_printk_level(dev_crit, KERN_CRIT);
+define_dev_printk_level(dev_err, KERN_ERR);
+define_dev_printk_level(dev_warn, KERN_WARNING);
+define_dev_printk_level(dev_notice, KERN_NOTICE);
+define_dev_printk_level(_dev_info, KERN_INFO);
+
+#endif