1 files changed, 25 insertions, 0 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index 9d4f6a963936..b00e02711393 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -42,6 +42,8 @@ struct bus_type {
         struct klist            klist_devices;
         struct klist            klist_drivers;
 
+        struct blocking_notifier_head bus_notifier;
+
         struct bus_attribute    * bus_attrs;
         struct device_attribute * dev_attrs;
         struct driver_attribute * drv_attrs;
@@ -75,6 +77,29 @@ int __must_check bus_for_each_drv(struct bus_type *bus,
                 struct device_driver *start, void *data,
                 int (*fn)(struct device_driver *, void *));
 
+/*
+ * Bus notifiers: Get notified of addition/removal of devices
+ * and binding/unbinding of drivers to devices.
+ * In the long run, it should be a replacement for the platform
+ * notify hooks.
+ */
+struct notifier_block;
+
+extern int bus_register_notifier(struct bus_type *bus,
+                                 struct notifier_block *nb);
+extern int bus_unregister_notifier(struct bus_type *bus,
+                                   struct notifier_block *nb);
+
+/* All 4 notifers below get called with the target struct device *
+ * as an argument. Note that those functions are likely to be called
+ * with the device semaphore held in the core, so be careful.
+ */
+#define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
+#define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
+#define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
+#define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
+                                                      unbound */
+
 /* driverfs interface for exporting bus attributes */
 
 struct bus_attribute {