#include <linux/string.h>
#include <linux/kdev_t.h>
#include <linux/notifier.h>
-
-#include <asm/semaphore.h>
+#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"
-int (*platform_notify)(struct device * dev) = NULL;
-int (*platform_notify_remove)(struct device * dev) = NULL;
+int (*platform_notify)(struct device *dev) = NULL;
+int (*platform_notify_remove)(struct device *dev) = NULL;
+static struct kobject *dev_kobj;
+struct kobject *sysfs_dev_char_kobj;
+struct kobject *sysfs_dev_block_kobj;
-/*
- * sysfs bindings for devices.
- */
+#ifdef CONFIG_BLOCK
+static inline int device_is_not_partition(struct device *dev)
+{
+ return !(dev->type == &part_type);
+}
+#else
+static inline int device_is_not_partition(struct device *dev)
+{
+ return 1;
+}
+#endif
/**
* dev_driver_string - Return a device's driver name, if at all possible
* 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 :
#define to_dev(obj) container_of(obj, struct device, kobj)
#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
-static ssize_t
-dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
{
- struct device_attribute * dev_attr = to_dev_attr(attr);
- struct device * dev = to_dev(kobj);
+ struct device_attribute *dev_attr = to_dev_attr(attr);
+ struct device *dev = to_dev(kobj);
ssize_t ret = -EIO;
if (dev_attr->show)
ret = dev_attr->show(dev, dev_attr, buf);
+ if (ret >= (ssize_t)PAGE_SIZE) {
+ print_symbol("dev_attr_show: %s returned bad count\n",
+ (unsigned long)dev_attr->show);
+ }
return ret;
}
-static ssize_t
-dev_attr_store(struct kobject * kobj, struct attribute * attr,
- const char * buf, size_t count)
+static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t count)
{
- struct device_attribute * dev_attr = to_dev_attr(attr);
- struct device * dev = to_dev(kobj);
+ struct device_attribute *dev_attr = to_dev_attr(attr);
+ struct device *dev = to_dev(kobj);
ssize_t ret = -EIO;
if (dev_attr->store)
* reaches 0. We forward the call to the device's release
* method, which should handle actually freeing the structure.
*/
-static void device_release(struct kobject * kobj)
+static void device_release(struct kobject *kobj)
{
- struct device * dev = to_dev(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() function, "
- "it is broken and must be fixed.\n",
- dev->bus_id);
- WARN_ON(1);
- }
+ else
+ WARN(1, KERN_ERR "Device '%s' does not have a release() "
+ "function, it is broken and must be fixed.\n",
+ dev_name(dev));
+ kfree(p);
}
-static struct kobj_type ktype_device = {
+static struct kobj_type device_ktype = {
.release = device_release,
.sysfs_ops = &dev_sysfs_ops,
};
{
struct kobj_type *ktype = get_ktype(kobj);
- if (ktype == &ktype_device) {
+ if (ktype == &device_ktype) {
struct device *dev = to_dev(kobj);
- if (dev->uevent_suppress)
- return 0;
if (dev->bus)
return 1;
if (dev->class)
return NULL;
}
-static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp,
- int num_envp, char *buffer, int buffer_size)
+static int dev_uevent(struct kset *kset, struct kobject *kobj,
+ struct kobj_uevent_env *env)
{
struct device *dev = to_dev(kobj);
- int i = 0;
- int length = 0;
int retval = 0;
- /* add the major/minor if present */
+ /* add device node properties if present */
if (MAJOR(dev->devt)) {
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "MAJOR=%u", MAJOR(dev->devt));
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "MINOR=%u", MINOR(dev->devt));
+ const char *tmp;
+ const char *name;
+
+ add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
+ add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
+ name = device_get_nodename(dev, &tmp);
+ if (name) {
+ add_uevent_var(env, "DEVNAME=%s", name);
+ kfree(tmp);
+ }
}
if (dev->type && dev->type->name)
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "DEVTYPE=%s", dev->type->name);
+ add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
if (dev->driver)
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "DRIVER=%s", dev->driver->name);
+ add_uevent_var(env, "DRIVER=%s", dev->driver->name);
#ifdef CONFIG_SYSFS_DEPRECATED
if (dev->class) {
const char *path;
path = kobject_get_path(&parent->kobj, GFP_KERNEL);
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "PHYSDEVPATH=%s", path);
- kfree(path);
+ if (path) {
+ add_uevent_var(env, "PHYSDEVPATH=%s", path);
+ kfree(path);
+ }
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "PHYSDEVBUS=%s", parent->bus->name);
+ add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);
if (parent->driver)
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "PHYSDEVDRIVER=%s", parent->driver->name);
+ add_uevent_var(env, "PHYSDEVDRIVER=%s",
+ parent->driver->name);
}
} else if (dev->bus) {
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "PHYSDEVBUS=%s", dev->bus->name);
+ add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
if (dev->driver)
- add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "PHYSDEVDRIVER=%s", dev->driver->name);
+ add_uevent_var(env, "PHYSDEVDRIVER=%s",
+ dev->driver->name);
}
#endif
- /* terminate, set to next free slot, shrink available space */
- envp[i] = NULL;
- envp = &envp[i];
- num_envp -= i;
- buffer = &buffer[length];
- buffer_size -= length;
-
+ /* have the bus specific function add its stuff */
if (dev->bus && dev->bus->uevent) {
- /* have the bus specific function add its stuff */
- retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size);
+ retval = dev->bus->uevent(dev, env);
if (retval)
- pr_debug ("%s: bus uevent() returned %d\n",
- __FUNCTION__, retval);
+ pr_debug("device: '%s': %s: bus uevent() returned %d\n",
+ dev_name(dev), __func__, retval);
}
+ /* have the class specific function add its stuff */
if (dev->class && dev->class->dev_uevent) {
- /* have the class specific function add its stuff */
- retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size);
+ retval = dev->class->dev_uevent(dev, env);
if (retval)
- pr_debug("%s: class uevent() returned %d\n",
- __FUNCTION__, retval);
+ pr_debug("device: '%s': %s: class uevent() "
+ "returned %d\n", dev_name(dev),
+ __func__, retval);
}
+ /* have the device type specific fuction add its stuff */
if (dev->type && dev->type->uevent) {
- /* have the device type specific fuction add its stuff */
- retval = dev->type->uevent(dev, envp, num_envp, buffer, buffer_size);
+ retval = dev->type->uevent(dev, env);
if (retval)
- pr_debug("%s: dev_type uevent() returned %d\n",
- __FUNCTION__, retval);
+ pr_debug("device: '%s': %s: dev_type uevent() "
+ "returned %d\n", dev_name(dev),
+ __func__, retval);
}
return retval;
{
struct kobject *top_kobj;
struct kset *kset;
- char *envp[32];
- char *data = NULL;
- char *pos;
+ struct kobj_uevent_env *env = NULL;
int i;
size_t count = 0;
int retval;
/* search the kset, the device belongs to */
top_kobj = &dev->kobj;
- if (!top_kobj->kset && top_kobj->parent) {
- do {
- top_kobj = top_kobj->parent;
- } while (!top_kobj->kset && top_kobj->parent);
- }
+ while (!top_kobj->kset && top_kobj->parent)
+ top_kobj = top_kobj->parent;
if (!top_kobj->kset)
goto out;
+
kset = top_kobj->kset;
if (!kset->uevent_ops || !kset->uevent_ops->uevent)
goto out;
if (!kset->uevent_ops->filter(kset, &dev->kobj))
goto out;
- data = (char *)get_zeroed_page(GFP_KERNEL);
- if (!data)
+ env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
+ if (!env)
return -ENOMEM;
/* let the kset specific function add its keys */
- pos = data;
- retval = kset->uevent_ops->uevent(kset, &dev->kobj,
- envp, ARRAY_SIZE(envp),
- pos, PAGE_SIZE);
+ retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
if (retval)
goto out;
/* copy keys to file */
- for (i = 0; envp[i]; i++) {
- pos = &buf[count];
- count += sprintf(pos, "%s\n", envp[i]);
- }
+ for (i = 0; i < env->envp_idx; i++)
+ count += sprintf(&buf[count], "%s\n", env->envp[i]);
out:
- free_page((unsigned long)data);
+ kfree(env);
return count;
}
static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
- if (memcmp(buf, "add", 3) != 0)
- dev_err(dev, "uevent: unsupported action-string; this will "
- "be ignored in a future kernel version");
+ enum kobject_action action;
+
+ 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:
return count;
}
+static struct device_attribute uevent_attr =
+ __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
+
static int device_add_attributes(struct device *dev,
struct device_attribute *attrs)
{
error = sysfs_create_group(&dev->kobj, groups[i]);
if (error) {
while (--i >= 0)
- sysfs_remove_group(&dev->kobj, groups[i]);
+ sysfs_remove_group(&dev->kobj,
+ groups[i]);
break;
}
}
return print_dev_t(buf, dev->devt);
}
-/*
- * devices_subsys - structure to be registered with kobject core.
- */
-
-decl_subsys(devices, &ktype_device, &device_uevent_ops);
+static struct device_attribute devt_attr =
+ __ATTR(dev, S_IRUGO, show_dev, NULL);
+/* kset to create /sys/devices/ */
+struct kset *devices_kset;
/**
- * device_create_file - create sysfs attribute file for device.
- * @dev: device.
- * @attr: device attribute descriptor.
+ * device_create_file - create sysfs attribute file for device.
+ * @dev: device.
+ * @attr: device attribute descriptor.
*/
-
-int device_create_file(struct device * dev, struct device_attribute * attr)
+int device_create_file(struct device *dev, struct device_attribute *attr)
{
int error = 0;
- if (get_device(dev)) {
+ if (dev)
error = sysfs_create_file(&dev->kobj, &attr->attr);
- put_device(dev);
- }
return error;
}
/**
- * device_remove_file - remove sysfs attribute file.
- * @dev: device.
- * @attr: device attribute descriptor.
+ * device_remove_file - remove sysfs attribute file.
+ * @dev: device.
+ * @attr: device attribute descriptor.
*/
-
-void device_remove_file(struct device * dev, struct device_attribute * attr)
+void device_remove_file(struct device *dev, struct device_attribute *attr)
{
- if (get_device(dev)) {
+ if (dev)
sysfs_remove_file(&dev->kobj, &attr->attr);
- put_device(dev);
- }
}
/**
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.
+ * device_initialize - init device structure.
+ * @dev: device.
+ *
+ * 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 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.
*
- * This prepares the device for use by other layers,
- * including adding it to the device hierarchy.
- * 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).
+ * 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)
{
- kobj_set_kset_s(dev, devices_subsys);
- kobject_init(&dev->kobj);
- klist_init(&dev->klist_children, klist_children_get,
- klist_children_put);
+ dev->kobj.kset = devices_kset;
+ kobject_init(&dev->kobj, &device_ktype);
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);
}
#ifdef CONFIG_SYSFS_DEPRECATED
-static struct kobject * get_device_parent(struct device *dev,
- struct device *parent)
+static struct kobject *get_device_parent(struct device *dev,
+ struct device *parent)
{
- /* Set the parent to the class, not the parent device */
- /* this keeps sysfs from having a symlink to make old udevs happy */
- if (dev->class)
- return &dev->class->subsys.kset.kobj;
+ /* 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;
if (!virtual_dir)
- virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual");
+ virtual_dir = kobject_create_and_add("virtual",
+ &devices_kset->kobj);
return virtual_dir;
}
-static struct kobject * get_device_parent(struct device *dev,
- struct device *parent)
+static struct kobject *get_device_parent(struct device *dev,
+ struct device *parent)
{
+ int retval;
+
if (dev->class) {
struct kobject *kobj = NULL;
struct kobject *parent_kobj;
/*
* If we have no parent, we live in "virtual".
- * Class-devices with a bus-device as parent, live
- * in a class-directory to prevent namespace collisions.
+ * Class-devices with a non class-device as parent, live
+ * in a "glue" directory to prevent namespace collisions.
*/
if (parent == NULL)
parent_kobj = virtual_device_parent(dev);
parent_kobj = &parent->kobj;
/* find our class-directory at the parent and reference it */
- spin_lock(&dev->class->class_dirs.list_lock);
- list_for_each_entry(k, &dev->class->class_dirs.list, entry)
+ spin_lock(&dev->class->p->class_dirs.list_lock);
+ list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
if (k->parent == parent_kobj) {
kobj = kobject_get(k);
break;
}
- spin_unlock(&dev->class->class_dirs.list_lock);
+ spin_unlock(&dev->class->p->class_dirs.list_lock);
if (kobj)
return kobj;
/* or create a new class-directory at the parent device */
- return kobject_kset_add_dir(&dev->class->class_dirs,
- parent_kobj, dev->class->name);
+ 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;
+ }
+ /* do not emit an uevent for this simple "glue" directory */
+ return k;
}
if (parent)
return &parent->kobj;
return NULL;
}
+
+static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
+{
+ /* see if we live in a "glue" directory */
+ if (!glue_dir || !dev->class ||
+ glue_dir->kset != &dev->class->p->class_dirs)
+ return;
+
+ kobject_put(glue_dir);
+}
+
+static void cleanup_device_parent(struct device *dev)
+{
+ cleanup_glue_dir(dev, dev->kobj.parent);
+}
#endif
-static int setup_parent(struct device *dev, struct device *parent)
+static void setup_parent(struct device *dev, struct device *parent)
{
struct kobject *kobj;
kobj = get_device_parent(dev, parent);
- if (IS_ERR(kobj))
- return PTR_ERR(kobj);
if (kobj)
dev->kobj.parent = kobj;
+}
+
+static int device_add_class_symlinks(struct device *dev)
+{
+ int error;
+
+ if (!dev->class)
+ return 0;
+
+ error = sysfs_create_link(&dev->kobj,
+ &dev->class->p->class_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,
+ "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;
+ }
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
+ /* link in the class directory pointing to the device */
+ 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)) {
+ 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_subsys:
+ sysfs_remove_link(&dev->kobj, "subsystem");
+out:
+ return error;
+}
+
+static void device_remove_class_symlinks(struct device *dev)
+{
+ 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");
+}
+
+/**
+ * dev_set_name - set a device name
+ * @dev: device
+ * @fmt: format string for the device's name
+ */
+int dev_set_name(struct device *dev, const char *fmt, ...)
+{
+ va_list vargs;
+ int err;
+
+ va_start(vargs, fmt);
+ err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
+ va_end(vargs);
+ return err;
+}
+EXPORT_SYMBOL_GPL(dev_set_name);
+
+/**
+ * device_to_dev_kobj - select a /sys/dev/ directory for the device
+ * @dev: device
+ *
+ * By default we select char/ for new entries. Setting class->dev_obj
+ * to NULL prevents an entry from being created. class->dev_kobj must
+ * be set (or cleared) before any devices are registered to the class
+ * otherwise device_create_sys_dev_entry() and
+ * device_remove_sys_dev_entry() will disagree about the the presence
+ * of the link.
+ */
+static struct kobject *device_to_dev_kobj(struct device *dev)
+{
+ struct kobject *kobj;
+
+ if (dev->class)
+ kobj = dev->class->dev_kobj;
+ else
+ kobj = sysfs_dev_char_kobj;
+
+ return kobj;
+}
+
+static int device_create_sys_dev_entry(struct device *dev)
+{
+ struct kobject *kobj = device_to_dev_kobj(dev);
+ int error = 0;
+ char devt_str[15];
+
+ if (kobj) {
+ format_dev_t(devt_str, dev->devt);
+ error = sysfs_create_link(kobj, &dev->kobj, devt_str);
+ }
+
+ return error;
+}
+
+static void device_remove_sys_dev_entry(struct device *dev)
+{
+ struct kobject *kobj = device_to_dev_kobj(dev);
+ char devt_str[15];
+
+ if (kobj) {
+ format_dev_t(devt_str, dev->devt);
+ sysfs_remove_link(kobj, devt_str);
+ }
}
/**
- * device_add - add device to device hierarchy.
- * @dev: device.
+ * device_add - add device to device hierarchy.
+ * @dev: device.
*
- * This is part 2 of device_register(), though may be called
- * separately _iff_ device_initialize() has been called separately.
+ * 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
- * to the global and sibling lists for the device, then
- * adds it to the other relevant subsystems of the driver model.
+ * 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;
- char *class_name = NULL;
struct class_interface *class_intf;
int error = -EINVAL;
dev = get_device(dev);
- if (!dev || !strlen(dev->bus_id))
- goto Error;
+ if (!dev)
+ goto done;
- pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);
+ 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);
+
+ /*
+ * 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 (!dev_name(dev))
+ goto name_error;
+
+ pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
parent = get_device(dev->parent);
- error = setup_parent(dev, parent);
- if (error)
- goto Error;
+ setup_parent(dev, parent);
+
+ /* use parent numa_node */
+ if (parent)
+ set_dev_node(dev, dev_to_node(parent));
/* first, register with generic layer. */
- kobject_set_name(&dev->kobj, "%s", dev->bus_id);
- error = kobject_add(&dev->kobj);
+ /* 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->bus_notifier,
- BUS_NOTIFY_ADD_DEVICE, dev);
-
- dev->uevent_attr.attr.name = "uevent";
- dev->uevent_attr.attr.mode = S_IRUGO | S_IWUSR;
- if (dev->driver)
- dev->uevent_attr.attr.owner = dev->driver->owner;
- dev->uevent_attr.store = store_uevent;
- dev->uevent_attr.show = show_uevent;
- error = device_create_file(dev, &dev->uevent_attr);
+ error = device_create_file(dev, &uevent_attr);
if (error)
goto attrError;
if (MAJOR(dev->devt)) {
- struct device_attribute *attr;
- attr = kzalloc(sizeof(*attr), GFP_KERNEL);
- if (!attr) {
- error = -ENOMEM;
- goto ueventattrError;
- }
- attr->attr.name = "dev";
- attr->attr.mode = S_IRUGO;
- if (dev->driver)
- attr->attr.owner = dev->driver->owner;
- attr->show = show_dev;
- error = device_create_file(dev, attr);
- if (error) {
- kfree(attr);
+ error = device_create_file(dev, &devt_attr);
+ if (error)
goto ueventattrError;
- }
-
- dev->devt_attr = attr;
- }
- if (dev->class) {
- sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj,
- "subsystem");
- /* If this is not a "fake" compatible device, then create the
- * symlink from the class to the device. */
- if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
- sysfs_create_link(&dev->class->subsys.kset.kobj,
- &dev->kobj, dev->bus_id);
- if (parent) {
- sysfs_create_link(&dev->kobj, &dev->parent->kobj,
- "device");
-#ifdef CONFIG_SYSFS_DEPRECATED
- class_name = make_class_name(dev->class->name,
- &dev->kobj);
- if (class_name)
- sysfs_create_link(&dev->parent->kobj,
- &dev->kobj, class_name);
-#endif
- }
+ error = device_create_sys_dev_entry(dev);
+ if (error)
+ goto devtattrError;
}
- if ((error = device_add_attrs(dev)))
+ error = device_add_class_symlinks(dev);
+ if (error)
+ goto SymlinkError;
+ error = device_add_attrs(dev);
+ if (error)
goto AttrsError;
- if ((error = device_pm_add(dev)))
- goto PMError;
- if ((error = bus_add_device(dev)))
+ error = bus_add_device(dev);
+ if (error)
goto BusError;
+ error = dpm_sysfs_add(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);
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->sem);
+ mutex_lock(&dev->class->p->class_mutex);
/* tie the class to the device */
- list_add_tail(&dev->node, &dev->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->interfaces, node)
+ 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->sem);
+ mutex_unlock(&dev->class->p->class_mutex);
}
- Done:
- kfree(class_name);
+done:
put_device(dev);
return error;
+ DPMError:
+ bus_remove_device(dev);
BusError:
- device_pm_remove(dev);
- PMError:
- if (dev->bus)
- blocking_notifier_call_chain(&dev->bus->bus_notifier,
- BUS_NOTIFY_DEL_DEVICE, dev);
device_remove_attrs(dev);
AttrsError:
- if (dev->devt_attr) {
- device_remove_file(dev, dev->devt_attr);
- kfree(dev->devt_attr);
- }
-
- if (dev->class) {
- sysfs_remove_link(&dev->kobj, "subsystem");
- /* If this is not a "fake" compatible device, remove the
- * symlink from the class to the device. */
- if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
- sysfs_remove_link(&dev->class->subsys.kset.kobj,
- dev->bus_id);
- if (parent) {
-#ifdef CONFIG_SYSFS_DEPRECATED
- char *class_name = make_class_name(dev->class->name,
- &dev->kobj);
- if (class_name)
- sysfs_remove_link(&dev->parent->kobj,
- class_name);
- kfree(class_name);
-#endif
- sysfs_remove_link(&dev->kobj, "device");
- }
- }
+ device_remove_class_symlinks(dev);
+ SymlinkError:
+ if (MAJOR(dev->devt))
+ device_remove_sys_dev_entry(dev);
+ devtattrError:
+ if (MAJOR(dev->devt))
+ device_remove_file(dev, &devt_attr);
ueventattrError:
- device_remove_file(dev, &dev->uevent_attr);
+ device_remove_file(dev, &uevent_attr);
attrError:
kobject_uevent(&dev->kobj, KOBJ_REMOVE);
kobject_del(&dev->kobj);
Error:
+ cleanup_device_parent(dev);
if (parent)
put_device(parent);
- goto Done;
+name_error:
+ kfree(dev->p);
+ dev->p = NULL;
+ goto done;
}
-
/**
- * device_register - register a device with the system.
- * @dev: pointer to the device structure
+ * device_register - register a device with the system.
+ * @dev: pointer to the device structure
+ *
+ * This happens in two clean steps - initialize the device
+ * and add it to the system. The two steps can be called
+ * separately, but this is the easiest and most common.
+ * 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.
*
- * This happens in two clean steps - initialize the device
- * and add it to the system. The two steps can be called
- * separately, but this is the easiest and most common.
- * 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)
{
device_initialize(dev);
return device_add(dev);
}
-
/**
- * get_device - increment reference count for device.
- * @dev: device.
+ * get_device - increment reference count for device.
+ * @dev: device.
*
- * This simply forwards the call to kobject_get(), though
- * we do take care to provide for the case that we get a NULL
- * pointer passed in.
+ * This simply forwards the call to kobject_get(), though
+ * we do take care to provide for the case that we get a NULL
+ * pointer passed in.
*/
-
-struct device * get_device(struct device * dev)
+struct device *get_device(struct device *dev)
{
return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
}
-
/**
- * put_device - decrement reference count.
- * @dev: device in question.
+ * put_device - decrement reference count.
+ * @dev: device in question.
*/
-void put_device(struct device * dev)
+void put_device(struct device *dev)
{
+ /* might_sleep(); */
if (dev)
kobject_put(&dev->kobj);
}
-
/**
- * device_del - delete device from system.
- * @dev: device.
+ * device_del - delete device from system.
+ * @dev: device.
*
- * This is the first part of the device unregistration
- * sequence. This removes the device from the lists we control
- * from here, has it removed from the other driver model
- * subsystems it was added to in device_add(), and removes it
- * from the kobject hierarchy.
+ * This is the first part of the device unregistration
+ * sequence. This removes the device from the lists we control
+ * from here, has it removed from the other driver model
+ * subsystems it was added to in device_add(), and removes it
+ * from the kobject hierarchy.
*
- * NOTE: this should be called manually _iff_ device_add() was
- * also called manually.
+ * NOTE: this should be called manually _iff_ device_add() was
+ * also called manually.
*/
-
-void device_del(struct device * dev)
+void device_del(struct device *dev)
{
- struct device * parent = dev->parent;
+ 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);
- if (dev->devt_attr) {
- device_remove_file(dev, dev->devt_attr);
- kfree(dev->devt_attr);
+ 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) {
- sysfs_remove_link(&dev->kobj, "subsystem");
- /* If this is not a "fake" compatible device, remove the
- * symlink from the class to the device. */
- if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
- sysfs_remove_link(&dev->class->subsys.kset.kobj,
- dev->bus_id);
- if (parent) {
-#ifdef CONFIG_SYSFS_DEPRECATED
- char *class_name = make_class_name(dev->class->name,
- &dev->kobj);
- if (class_name)
- sysfs_remove_link(&dev->parent->kobj,
- class_name);
- kfree(class_name);
-#endif
- sysfs_remove_link(&dev->kobj, "device");
- }
+ device_remove_class_symlinks(dev);
- down(&dev->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->interfaces, node)
+ 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->sem);
-
- /* If we live in a parent class-directory, unreference it */
- if (dev->kobj.parent->kset == &dev->class->class_dirs) {
- struct device *d;
- int other = 0;
-
- /*
- * if we are the last child of our class, delete
- * our class-directory at this parent
- */
- down(&dev->class->sem);
- list_for_each_entry(d, &dev->class->devices, node) {
- if (d == dev)
- continue;
- if (d->kobj.parent == dev->kobj.parent) {
- other = 1;
- break;
- }
- }
- if (!other)
- kobject_del(dev->kobj.parent);
-
- kobject_put(dev->kobj.parent);
- up(&dev->class->sem);
- }
+ klist_del(&dev->knode_class);
+ mutex_unlock(&dev->class->p->class_mutex);
}
- device_remove_file(dev, &dev->uevent_attr);
+ device_remove_file(dev, &uevent_attr);
device_remove_attrs(dev);
bus_remove_device(dev);
*/
if (platform_notify_remove)
platform_notify_remove(dev);
- if (dev->bus)
- blocking_notifier_call_chain(&dev->bus->bus_notifier,
- BUS_NOTIFY_DEL_DEVICE, dev);
- device_pm_remove(dev);
kobject_uevent(&dev->kobj, KOBJ_REMOVE);
+ cleanup_device_parent(dev);
kobject_del(&dev->kobj);
- if (parent)
- put_device(parent);
+ put_device(parent);
}
/**
- * device_unregister - unregister device from system.
- * @dev: device going away.
+ * device_unregister - unregister device from system.
+ * @dev: device going away.
*
- * We do this in two parts, like we do device_register(). First,
- * we remove it from all the subsystems with device_del(), then
- * we decrement the reference count via put_device(). If that
- * is the final reference count, the device will be cleaned up
- * via device_release() above. Otherwise, the structure will
- * stick around until the final reference to the device is dropped.
+ * We do this in two parts, like we do device_register(). First,
+ * we remove it from all the subsystems with device_del(), then
+ * we decrement the reference count via put_device(). If that
+ * is the final reference count, the device will be cleaned up
+ * via device_release() above. Otherwise, the structure will
+ * stick around until the final reference to the device is dropped.
*/
-void device_unregister(struct device * dev)
+void device_unregister(struct device *dev)
{
- pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id);
+ 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);
+ struct device *dev = NULL;
+ struct device_private *p;
+
+ if (n) {
+ p = to_device_private_parent(n);
+ dev = p->device;
+ }
+ return dev;
+}
-static struct device * next_device(struct klist_iter * i)
+/**
+ * device_get_nodename - path of device node file
+ * @dev: device
+ * @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_nodename(struct device *dev, const char **tmp)
{
- struct klist_node * n = klist_next(i);
- return n ? container_of(n, struct device, knode_parent) : NULL;
+ char *s;
+
+ *tmp = NULL;
+
+ /* the device type may provide a specific name */
+ if (dev->type && dev->type->nodename)
+ *tmp = dev->type->nodename(dev);
+ if (*tmp)
+ return *tmp;
+
+ /* the class may provide a specific name */
+ if (dev->class && dev->class->nodename)
+ *tmp = dev->class->nodename(dev);
+ 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.
- * @data: data for the callback.
- * @fn: function to be called for each device.
+ * device_for_each_child - device child iterator.
+ * @parent: parent struct device.
+ * @data: data for the callback.
+ * @fn: function to be called for each device.
*
- * Iterate over @parent's child devices, and call @fn for each,
- * passing it @data.
+ * Iterate over @parent's child 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.
+ * We check the return of @fn each time. If it returns anything
+ * other than 0, we break out and return that value.
*/
-int device_for_each_child(struct device * parent, void * data,
- int (*fn)(struct device *, void *))
+int device_for_each_child(struct device *parent, void *data,
+ int (*fn)(struct device *dev, void *data))
{
struct klist_iter i;
- struct device * child;
+ 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);
* current device can be obtained, this function will return to the caller
* and not iterate over any more devices.
*/
-struct device * device_find_child(struct device *parent, void *data,
- int (*match)(struct device *, void *))
+struct device *device_find_child(struct device *parent, void *data,
+ int (*match)(struct device *dev, void *data))
{
struct klist_iter i;
struct device *child;
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;
int __init devices_init(void)
{
- return subsystem_register(&devices_subsys);
+ devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
+ if (!devices_kset)
+ return -ENOMEM;
+ dev_kobj = kobject_create_and_add("dev", NULL);
+ if (!dev_kobj)
+ goto dev_kobj_err;
+ sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
+ if (!sysfs_dev_block_kobj)
+ goto block_kobj_err;
+ sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
+ if (!sysfs_dev_char_kobj)
+ goto char_kobj_err;
+
+ return 0;
+
+ char_kobj_err:
+ kobject_put(sysfs_dev_block_kobj);
+ block_kobj_err:
+ kobject_put(dev_kobj);
+ dev_kobj_err:
+ kset_unregister(devices_kset);
+ return -ENOMEM;
}
EXPORT_SYMBOL_GPL(device_for_each_child);
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, "%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_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("%s called for %s\n", __FUNCTION__, dev->bus_id);
+ pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
kfree(dev);
}
/**
- * device_create - creates a device and registers it with sysfs
+ * device_create_vargs - creates a device and registers it with sysfs
* @class: pointer to the struct class that this device should be registered to
* @parent: pointer to the parent struct device of this new device, if any
* @devt: the dev_t for the char device to be added
+ * @drvdata: the data to be added to the device for callbacks
* @fmt: string for the device's name
+ * @args: va_list for the device's name
*
* This function can be used by char device classes. A struct device
* will be created in sysfs, registered to the specified class.
* Note: the struct class passed to this function must have previously
* been created with a call to class_create().
*/
-struct device *device_create(struct class *class, struct device *parent,
- dev_t devt, const char *fmt, ...)
+struct device *device_create_vargs(struct class *class, struct device *parent,
+ dev_t devt, void *drvdata, const char *fmt,
+ va_list args)
{
- va_list args;
struct device *dev = NULL;
int retval = -ENODEV;
dev->class = class;
dev->parent = parent;
dev->release = device_create_release;
+ dev_set_drvdata(dev, drvdata);
+
+ retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
+ if (retval)
+ goto error;
- va_start(args, fmt);
- vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
- va_end(args);
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_create - creates a device and registers it with sysfs
+ * @class: pointer to the struct class that this device should be registered to
+ * @parent: pointer to the parent struct device of this new device, if any
+ * @devt: the dev_t for the char device to be added
+ * @drvdata: the data to be added to the device for callbacks
+ * @fmt: string for the device's name
+ *
+ * This function can be used by char device classes. A struct device
+ * will be created in sysfs, registered to the specified class.
+ *
+ * A "dev" file will be created, showing the dev_t for the device, if
+ * the dev_t is not 0,0.
+ * If a pointer to a parent struct device is passed in, the newly created
+ * struct device will be a child of that device in sysfs.
+ * The pointer to the struct 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 device *device_create(struct class *class, struct device *parent,
+ dev_t devt, void *drvdata, const char *fmt, ...)
+{
+ va_list vargs;
+ struct device *dev;
+
+ va_start(vargs, fmt);
+ dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
+ va_end(vargs);
+ return dev;
+}
EXPORT_SYMBOL_GPL(device_create);
+static int __match_devt(struct device *dev, void *data)
+{
+ dev_t *devt = data;
+
+ return dev->devt == *devt;
+}
+
/**
* device_destroy - removes a device that was created with device_create()
* @class: pointer to the struct class that this device was registered with
*/
void device_destroy(struct class *class, dev_t devt)
{
- struct device *dev = NULL;
- struct device *dev_tmp;
-
- down(&class->sem);
- list_for_each_entry(dev_tmp, &class->devices, node) {
- if (dev_tmp->devt == devt) {
- dev = dev_tmp;
- break;
- }
- }
- up(&class->sem);
+ struct device *dev;
- if (dev)
+ dev = class_find_device(class, NULL, &devt, __match_devt);
+ if (dev) {
+ put_device(dev);
device_unregister(dev);
+ }
}
EXPORT_SYMBOL_GPL(device_destroy);
* 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)
{
char *old_class_name = NULL;
char *new_class_name = NULL;
- char *old_symlink_name = NULL;
+ char *old_device_name = NULL;
int error;
dev = get_device(dev);
if (!dev)
return -EINVAL;
- pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name);
+ 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
- if (dev->class) {
- old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
- if (!old_symlink_name) {
- error = -ENOMEM;
- goto out_free_old_class;
- }
- strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE);
+ old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
+ if (!old_device_name) {
+ error = -ENOMEM;
+ goto out;
}
- strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
-
error = kobject_rename(&dev->kobj, new_name);
+ 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) {
- 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);
}
}
-#endif
-
+#else
if (dev->class) {
- sysfs_remove_link(&dev->class->subsys.kset.kobj,
- old_symlink_name);
- sysfs_create_link(&dev->class->subsys.kset.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,
+ old_device_name);
}
+#endif
+
+out:
put_device(dev);
kfree(new_class_name);
- kfree(old_symlink_name);
- out_free_old_class:
kfree(old_class_name);
+ kfree(old_device_name);
return error;
}
class_name);
if (error)
sysfs_remove_link(&dev->kobj, "device");
- }
- else
+ } else
error = 0;
out:
kfree(class_name);
* 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);
- if (IS_ERR(new_parent_kobj)) {
- error = PTR_ERR(new_parent_kobj);
- put_device(new_parent);
- goto out;
- }
- pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id,
- new_parent ? new_parent->bus_id : "<NULL>");
+ new_parent_kobj = get_device_parent(dev, new_parent);
+
+ 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);
put_device(new_parent);
goto out;
}
old_parent = dev->parent;
dev->parent = new_parent;
if (old_parent)
- klist_remove(&dev->knode_parent);
- if (new_parent)
- klist_add_tail(&dev->knode_parent, &new_parent->klist_children);
+ klist_remove(&dev->p->knode_parent);
+ if (new_parent) {
+ klist_add_tail(&dev->p->knode_parent,
+ &new_parent->p->klist_children);
+ set_dev_node(dev, dev_to_node(new_parent));
+ }
+
if (!dev->class)
goto out_put;
error = device_move_class_links(dev, old_parent, 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);
- if (old_parent)
- klist_add_tail(&dev->knode_parent,
- &old_parent->klist_children);
+ klist_remove(&dev->p->knode_parent);
+ dev->parent = old_parent;
+ if (old_parent) {
+ klist_add_tail(&dev->p->knode_parent,
+ &old_parent->p->klist_children);
+ set_dev_node(dev, dev_to_node(old_parent));
+ }
}
+ cleanup_glue_dir(dev, new_parent_kobj);
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;
}
-
EXPORT_SYMBOL_GPL(device_move);
+
+/**
+ * device_shutdown - call ->shutdown() on each device to shutdown.
+ */
+void device_shutdown(void)
+{
+ struct device *dev, *devn;
+
+ 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);
+ } else if (dev->driver && dev->driver->shutdown) {
+ dev_dbg(dev, "shutdown\n");
+ dev->driver->shutdown(dev);
+ }
+ }
+ 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