linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / include / linux / dio.h

diff --git a/include/linux/dio.h b/include/linux/dio.h
index 1e65ebc..fae9395 100644 (file)
--- a/include/linux/dio.h
+++ b/include/linux/dio.h
@@ -276,5 +276,37 @@ static inline void dio_set_drvdata (struct dio_dev *d, void *data)
        dev_set_drvdata(&d->dev, data);
 }
 
+/*
+ * A helper function which helps ensure correct dio_driver
+ * setup and cleanup for commonly-encountered hotplug/modular cases
+ *
+ * This MUST stay in a header, as it checks for -DMODULE
+ */
+static inline int dio_module_init(struct dio_driver *drv)
+{
+       int rc = dio_register_driver(drv);
+
+       if (rc > 0)
+               return 0;
+
+       /* iff CONFIG_HOTPLUG and built into kernel, we should
+        * leave the driver around for future hotplug events.
+        * For the module case, a hotplug daemon of some sort
+        * should load a module in response to an insert event. */
+#if defined(CONFIG_HOTPLUG) && !defined(MODULE)
+       if (rc == 0)
+               return 0;
+#else
+       if (rc == 0)
+               rc = -ENODEV;
+#endif
+
+       /* if we get here, we need to clean up DIO driver instance
+        * and return some sort of error */
+       dio_unregister_driver(drv);
+
+       return rc;
+}
+
 #endif /* __KERNEL__ */
 #endif /* ndef _LINUX_DIO_H */