* sysfs bindings for devices.
*/
+/**
+ * dev_driver_string - Return a device's driver name, if at all possible
+ * @dev: struct device to get the name of
+ *
+ * Will return the device's driver's name if it is bound to a device. If
+ * the device is not bound to a device, it will return the name of the bus
+ * 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)
+{
+ return dev->driver ? dev->driver->name :
+ (dev->bus ? dev->bus->name : "");
+}
+EXPORT_SYMBOL_GPL(dev_driver_string);
+
#define to_dev(obj) container_of(obj, struct device, kobj)
#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
int device_add(struct device *dev)
{
struct device *parent = NULL;
+ char *class_name = NULL;
int error = -EINVAL;
dev = get_device(dev);
dev->devt_attr = attr;
}
- if (dev->class)
+ if (dev->class) {
+ sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj,
+ "subsystem");
sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj,
dev->bus_id);
+ sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device");
+ class_name = make_class_name(dev->class->name, &dev->kobj);
+ sysfs_create_link(&dev->parent->kobj, &dev->kobj, class_name);
+ }
+
if ((error = device_pm_add(dev)))
goto PMError;
if ((error = bus_add_device(dev)))
if (platform_notify)
platform_notify(dev);
Done:
+ kfree(class_name);
put_device(dev);
return error;
BusError:
void device_del(struct device * dev)
{
struct device * parent = dev->parent;
+ char *class_name = NULL;
if (parent)
klist_del(&dev->knode_parent);
if (dev->devt_attr)
device_remove_file(dev, dev->devt_attr);
- if (dev->class)
+ if (dev->class) {
+ sysfs_remove_link(&dev->kobj, "subsystem");
sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id);
+ class_name = make_class_name(dev->class->name, &dev->kobj);
+ sysfs_remove_link(&dev->kobj, "device");
+ sysfs_remove_link(&dev->parent->kobj, class_name);
+ kfree(class_name);
+ }
device_remove_file(dev, &dev->uevent_attr);
/* Notify the platform of the removal, in case they