#include <linux/genhd.h>
#include <linux/kallsyms.h>
#include <linux/semaphore.h>
+#include <linux/mutex.h>
+#include <linux/async.h>
#include "base.h"
#include "power/power.h"
* it is attached to. If it is not attached to a bus either, an empty
* string will be returned.
*/
-const char *dev_driver_string(struct device *dev)
+const char *dev_driver_string(const struct device *dev)
{
return dev->driver ? dev->driver->name :
(dev->bus ? dev->bus->name :
static void device_release(struct kobject *kobj)
{
struct device *dev = to_dev(kobj);
+ struct device_private *p = dev->p;
if (dev->release)
dev->release(dev);
dev->type->release(dev);
else if (dev->class && dev->class->dev_release)
dev->class->dev_release(dev);
- else {
- printk(KERN_ERR "Device '%s' does not have a release() "
+ else
+ WARN(1, KERN_ERR "Device '%s' does not have a release() "
"function, it is broken and must be fixed.\n",
- dev->bus_id);
- WARN_ON(1);
- }
+ dev_name(dev));
+ kfree(p);
}
static struct kobj_type device_ktype = {
if (ktype == &device_ktype) {
struct device *dev = to_dev(kobj);
- if (dev->uevent_suppress)
- return 0;
if (dev->bus)
return 1;
if (dev->class)
retval = dev->bus->uevent(dev, env);
if (retval)
pr_debug("device: '%s': %s: bus uevent() returned %d\n",
- dev->bus_id, __func__, retval);
+ dev_name(dev), __func__, retval);
}
/* have the class specific function add its stuff */
retval = dev->class->dev_uevent(dev, env);
if (retval)
pr_debug("device: '%s': %s: class uevent() "
- "returned %d\n", dev->bus_id,
+ "returned %d\n", dev_name(dev),
__func__, retval);
}
retval = dev->type->uevent(dev, env);
if (retval)
pr_debug("device: '%s': %s: dev_type uevent() "
- "returned %d\n", dev->bus_id,
+ "returned %d\n", dev_name(dev),
__func__, retval);
}
static void klist_children_get(struct klist_node *n)
{
- struct device *dev = container_of(n, struct device, knode_parent);
+ struct device_private *p = to_device_private_parent(n);
+ struct device *dev = p->device;
get_device(dev);
}
static void klist_children_put(struct klist_node *n)
{
- struct device *dev = container_of(n, struct device, knode_parent);
+ struct device_private *p = to_device_private_parent(n);
+ struct device *dev = p->device;
put_device(dev);
}
* device_initialize - init device structure.
* @dev: device.
*
- * This prepares the device for use by other layers,
- * including adding it to the device hierarchy.
+ * This prepares the device for use by other layers by initializing
+ * its fields.
* It is the first half of device_register(), if called by
- * that, though it can also be called separately, so one
- * may use @dev's fields (e.g. the refcount).
+ * that function, though it can also be called separately, so one
+ * may use @dev's fields. In particular, get_device()/put_device()
+ * may be used for reference counting of @dev after calling this
+ * function.
+ *
+ * NOTE: Use put_device() to give up your reference instead of freeing
+ * @dev directly once you have called this function.
*/
void device_initialize(struct device *dev)
{
dev->kobj.kset = devices_kset;
kobject_init(&dev->kobj, &device_ktype);
- klist_init(&dev->klist_children, klist_children_get,
- klist_children_put);
INIT_LIST_HEAD(&dev->dma_pools);
- INIT_LIST_HEAD(&dev->node);
init_MUTEX(&dev->sem);
spin_lock_init(&dev->devres_lock);
INIT_LIST_HEAD(&dev->devres_head);
device_init_wakeup(dev, 0);
+ device_pm_init(dev);
set_dev_node(dev, -1);
}
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->bus_id);
+ &dev->kobj, dev_name(dev));
if (error)
goto out_subsys;
}
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->bus_id);
+ dev_name(dev));
#else
/* link in the class directory pointing to the device */
error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
- &dev->kobj, dev->bus_id);
+ &dev->kobj, dev_name(dev));
if (error)
goto out_subsys;
return 0;
out_busid:
- sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id);
+ sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
#endif
out_subsys:
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->bus_id);
+ 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->bus_id);
+ sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
#endif
sysfs_remove_link(&dev->kobj, "subsystem");
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);
* This is part 2 of device_register(), though may be called
* separately _iff_ device_initialize() has been called separately.
*
- * This adds it to the kobject hierarchy via kobject_add(), adds it
+ * This adds @dev to the kobject hierarchy via kobject_add(), adds it
* to the global and sibling lists for the device, then
* adds it to the other relevant subsystems of the driver model.
+ *
+ * NOTE: _Never_ directly free @dev after calling this function, even
+ * if it returned an error! Always use put_device() to give up your
+ * reference instead.
*/
int device_add(struct device *dev)
{
struct device *parent = NULL;
struct class_interface *class_intf;
- int error;
+ int error = -EINVAL;
dev = get_device(dev);
- if (!dev || !strlen(dev->bus_id)) {
- error = -EINVAL;
- goto Done;
+ if (!dev)
+ goto done;
+
+ dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
+ if (!dev->p) {
+ error = -ENOMEM;
+ goto done;
}
+ dev->p->device = dev;
+ klist_init(&dev->p->klist_children, klist_children_get,
+ klist_children_put);
- pr_debug("device: '%s': %s\n", dev->bus_id, __func__);
+ /*
+ * 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, dev->init_name);
+ dev->init_name = NULL;
+ }
+
+ if (!dev_name(dev))
+ goto name_error;
+
+ pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
parent = get_device(dev->parent);
setup_parent(dev, parent);
set_dev_node(dev, dev_to_node(parent));
/* first, register with generic layer. */
- error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id);
+ /* 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 = bus_add_device(dev);
if (error)
goto BusError;
- error = device_pm_add(dev);
+ error = dpm_sysfs_add(dev);
if (error)
- goto PMError;
+ 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);
if (parent)
- klist_add_tail(&dev->knode_parent, &parent->klist_children);
+ klist_add_tail(&dev->p->knode_parent,
+ &parent->p->klist_children);
if (dev->class) {
- down(&dev->class->p->class_sem);
+ mutex_lock(&dev->class->p->class_mutex);
/* tie the class to the device */
- list_add_tail(&dev->node, &dev->class->p->class_devices);
+ klist_add_tail(&dev->knode_class,
+ &dev->class->p->class_devices);
/* notify any interfaces that the device is here */
list_for_each_entry(class_intf,
&dev->class->p->class_interfaces, node)
if (class_intf->add_dev)
class_intf->add_dev(dev, class_intf);
- up(&dev->class->p->class_sem);
+ mutex_unlock(&dev->class->p->class_mutex);
}
- Done:
+done:
put_device(dev);
return error;
- PMError:
+ 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);
cleanup_device_parent(dev);
if (parent)
put_device(parent);
- goto Done;
+name_error:
+ kfree(dev->p);
+ dev->p = NULL;
+ goto done;
}
/**
* I.e. you should only call the two helpers separately if
* have a clearly defined need to use and refcount the device
* before it is added to the hierarchy.
+ *
+ * NOTE: _Never_ directly free @dev after calling this function, even
+ * if it returned an error! Always use put_device() to give up the
+ * reference initialized in this function instead.
*/
int device_register(struct device *dev)
{
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->knode_parent);
+ klist_del(&dev->p->knode_parent);
if (MAJOR(dev->devt)) {
device_remove_sys_dev_entry(dev);
device_remove_file(dev, &devt_attr);
if (dev->class) {
device_remove_class_symlinks(dev);
- down(&dev->class->p->class_sem);
+ mutex_lock(&dev->class->p->class_mutex);
/* notify any interfaces that the device is now gone */
list_for_each_entry(class_intf,
&dev->class->p->class_interfaces, node)
if (class_intf->remove_dev)
class_intf->remove_dev(dev, class_intf);
/* remove the device from the class list */
- list_del_init(&dev->node);
- up(&dev->class->p->class_sem);
+ klist_del(&dev->knode_class);
+ mutex_unlock(&dev->class->p->class_mutex);
}
device_remove_file(dev, &uevent_attr);
device_remove_attrs(dev);
*/
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);
*/
void device_unregister(struct device *dev)
{
- pr_debug("device: '%s': %s\n", dev->bus_id, __func__);
+ pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
device_del(dev);
put_device(dev);
}
static struct device *next_device(struct klist_iter *i)
{
struct klist_node *n = klist_next(i);
- return n ? container_of(n, struct device, knode_parent) : NULL;
+ struct device *dev = NULL;
+ struct device_private *p;
+
+ if (n) {
+ p = to_device_private_parent(n);
+ dev = p->device;
+ }
+ return dev;
}
/**
struct device *child;
int error = 0;
- klist_iter_init(&parent->klist_children, &i);
+ if (!parent->p)
+ return 0;
+
+ klist_iter_init(&parent->p->klist_children, &i);
while ((child = next_device(&i)) && !error)
error = fn(child, data);
klist_iter_exit(&i);
if (!parent)
return NULL;
- klist_iter_init(&parent->klist_children, &i);
+ klist_iter_init(&parent->p->klist_children, &i);
while ((child = next_device(&i)))
if (match(child, data) && get_device(child))
break;
EXPORT_SYMBOL_GPL(device_create_file);
EXPORT_SYMBOL_GPL(device_remove_file);
+struct root_device
+{
+ struct device dev;
+ struct module *owner;
+};
+
+#define to_root_device(dev) container_of(dev, struct root_device, dev)
+
+static void root_device_release(struct device *dev)
+{
+ kfree(to_root_device(dev));
+}
+
+/**
+ * __root_device_register - allocate and register a root device
+ * @name: root device name
+ * @owner: owner module of the root device, usually THIS_MODULE
+ *
+ * This function allocates a root device and registers it
+ * using device_register(). In order to free the returned
+ * device, use root_device_unregister().
+ *
+ * Root devices are dummy devices which allow other devices
+ * to be grouped under /sys/devices. Use this function to
+ * allocate a root device and then use it as the parent of
+ * any device which should appear under /sys/devices/{name}
+ *
+ * The /sys/devices/{name} directory will also contain a
+ * 'module' symlink which points to the @owner directory
+ * in sysfs.
+ *
+ * Note: You probably want to use root_device_register().
+ */
+struct device *__root_device_register(const char *name, struct module *owner)
+{
+ struct root_device *root;
+ int err = -ENOMEM;
+
+ root = kzalloc(sizeof(struct root_device), GFP_KERNEL);
+ if (!root)
+ return ERR_PTR(err);
+
+ err = dev_set_name(&root->dev, name);
+ if (err) {
+ kfree(root);
+ return ERR_PTR(err);
+ }
+
+ root->dev.release = root_device_release;
+
+ err = device_register(&root->dev);
+ if (err) {
+ put_device(&root->dev);
+ return ERR_PTR(err);
+ }
+
+#ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */
+ if (owner) {
+ struct module_kobject *mk = &owner->mkobj;
+
+ err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module");
+ if (err) {
+ device_unregister(&root->dev);
+ return ERR_PTR(err);
+ }
+ root->owner = owner;
+ }
+#endif
+
+ return &root->dev;
+}
+EXPORT_SYMBOL_GPL(__root_device_register);
+
+/**
+ * root_device_unregister - unregister and free a root device
+ * @dev: device going away
+ *
+ * This function unregisters and cleans up a device that was created by
+ * root_device_register().
+ */
+void root_device_unregister(struct device *dev)
+{
+ struct root_device *root = to_root_device(dev);
+
+ if (root->owner)
+ sysfs_remove_link(&root->dev.kobj, "module");
+
+ device_unregister(dev);
+}
+EXPORT_SYMBOL_GPL(root_device_unregister);
+
static void device_create_release(struct device *dev)
{
- pr_debug("device: '%s': %s\n", dev->bus_id, __func__);
+ pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
kfree(dev);
}
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;
return dev;
error:
- kfree(dev);
+ put_device(dev);
return ERR_PTR(retval);
}
EXPORT_SYMBOL_GPL(device_create_vargs);
* device_rename - renames a device
* @dev: the pointer to the struct device to be renamed
* @new_name: the new name of the device
+ *
+ * It is the responsibility of the caller to provide mutual
+ * exclusion between two different calls of device_rename
+ * on the same device to ensure that new_name is valid and
+ * won't conflict with other devices.
*/
int device_rename(struct device *dev, char *new_name)
{
if (!dev)
return -EINVAL;
- pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id,
+ pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
__func__, new_name);
#ifdef CONFIG_SYSFS_DEPRECATED
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);
+ if (error)
goto out;
- }
#ifdef CONFIG_SYSFS_DEPRECATED
if (old_class_name) {
new_class_name = make_class_name(dev->class->name, &dev->kobj);
if (new_class_name) {
- error = sysfs_create_link(&dev->parent->kobj,
- &dev->kobj, 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(&dev->class->p->class_subsys.kobj,
- &dev->kobj, dev->bus_id);
+ error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj,
+ &dev->kobj, dev_name(dev));
if (error)
goto out;
sysfs_remove_link(&dev->class->p->class_subsys.kobj,
* 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);
- pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id,
- __func__, new_parent ? new_parent->bus_id : "<NULL>");
+ pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev),
+ __func__, new_parent ? dev_name(new_parent) : "<NULL>");
error = kobject_move(&dev->kobj, new_parent_kobj);
if (error) {
cleanup_glue_dir(dev, new_parent_kobj);
old_parent = dev->parent;
dev->parent = new_parent;
if (old_parent)
- klist_remove(&dev->knode_parent);
+ klist_remove(&dev->p->knode_parent);
if (new_parent) {
- klist_add_tail(&dev->knode_parent, &new_parent->klist_children);
+ klist_add_tail(&dev->p->knode_parent,
+ &new_parent->p->klist_children);
set_dev_node(dev, dev_to_node(new_parent));
}
device_move_class_links(dev, new_parent, old_parent);
if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
if (new_parent)
- klist_remove(&dev->knode_parent);
+ klist_remove(&dev->p->knode_parent);
dev->parent = old_parent;
if (old_parent) {
- klist_add_tail(&dev->knode_parent,
- &old_parent->klist_children);
+ klist_add_tail(&dev->p->knode_parent,
+ &old_parent->p->klist_children);
set_dev_node(dev, dev_to_node(old_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;
}
kobject_put(sysfs_dev_char_kobj);
kobject_put(sysfs_dev_block_kobj);
kobject_put(dev_kobj);
+ async_synchronize_full();
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff