int (*platform_notify)(struct device * dev) = NULL;
int (*platform_notify_remove)(struct device * dev) = NULL;
-/*
- * Detect the LANANA-assigned LOCAL/EXPERIMENTAL majors
- */
-bool is_lanana_major(unsigned int major)
-{
- if (major >= 60 && major <= 63)
- return 1;
- if (major >= 120 && major <= 127)
- return 1;
- if (major >= 240 && major <= 254)
- return 1;
- return 0;
-}
-
/*
* sysfs bindings for devices.
*/
}
EXPORT_SYMBOL_GPL(device_remove_bin_file);
+/**
+ * device_schedule_callback - helper to schedule a callback for a device
+ * @dev: device.
+ * @func: callback function to invoke later.
+ *
+ * Attribute methods must not unregister themselves or their parent device
+ * (which would amount to the same thing). Attempts to do so will deadlock,
+ * since unregistration is mutually exclusive with driver callbacks.
+ *
+ * Instead methods can call this routine, which will attempt to allocate
+ * and schedule a workqueue request to call back @func with @dev as its
+ * argument in the workqueue's process context. @dev will be pinned until
+ * @func returns.
+ *
+ * Returns 0 if the request was submitted, -ENOMEM if storage could not
+ * be allocated.
+ *
+ * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
+ * underlying sysfs routine (since it is intended for use by attribute
+ * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
+ */
+int device_schedule_callback(struct device *dev,
+ void (*func)(struct device *))
+{
+ return sysfs_schedule_callback(&dev->kobj,
+ (void (*)(void *)) func, dev);
+}
+EXPORT_SYMBOL_GPL(device_schedule_callback);
+
static void klist_children_get(struct klist_node *n)
{
struct device *dev = container_of(n, struct device, knode_parent);
return NULL;
}
#else
-static struct kobject * virtual_device_parent(struct device *dev)
+static struct kobject *virtual_device_parent(struct device *dev)
{
- if (!dev->class)
- return ERR_PTR(-ENODEV);
-
- if (!dev->class->virtual_dir) {
- static struct kobject *virtual_dir = NULL;
+ static struct kobject *virtual_dir = NULL;
- if (!virtual_dir)
- virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual");
- dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name);
- }
+ if (!virtual_dir)
+ virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual");
- return dev->class->virtual_dir;
+ return virtual_dir;
}
static struct kobject * get_device_parent(struct device *dev,
struct device *parent)
{
- /* if this is a class device, and has no parent, create one */
- if ((dev->class) && (parent == NULL)) {
- return virtual_device_parent(dev);
- } else if (parent)
+ if (dev->class) {
+ struct kobject *kobj = NULL;
+ struct kobject *parent_kobj;
+ struct kobject *k;
+
+ /*
+ * 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.
+ */
+ if (parent == NULL)
+ parent_kobj = virtual_device_parent(dev);
+ else if (parent->class)
+ return &parent->kobj;
+ else
+ 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)
+ if (k->parent == parent_kobj) {
+ kobj = kobject_get(k);
+ break;
+ }
+ spin_unlock(&dev->class->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);
+ }
+
+ if (parent)
return &parent->kobj;
return NULL;
}
-
#endif
+
static int setup_parent(struct device *dev, struct device *parent)
{
struct kobject *kobj;
pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);
parent = get_device(dev->parent);
-
error = setup_parent(dev, parent);
if (error)
goto Error;
#endif
sysfs_remove_link(&dev->kobj, "device");
}
-
- down(&dev->class->sem);
- /* notify any interfaces that the device is now gone */
- list_for_each_entry(class_intf, &dev->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);
}
ueventattrError:
device_remove_file(dev, &dev->uevent_attr);
/* 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);
+ }
}
device_remove_file(dev, &dev->uevent_attr);
device_remove_groups(dev);
projects / linux-2.6-omap-h63xx.git / blobdiff