usb: gadget: Add helper macro for usb_composite_driver boilerplate

Introduce the module_usb_composite_driver macro as a convenience macro
for USB gadget composite driver modules, similar to module_usb_driver.
It is intended to be used by drivers which init/exit section does
nothing but calling usb_composite_probe/usb_composite_unrregister. By
using this macro it is possible to eliminate a few lines of boilerplate
code per USB gadget composite driver.

Based on f3a6a4b6 ("USB: Add helper macro for usb_driver boilerplate")
which introduced the according macro for USB drivers.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 7373203..c330f5e 100644 (file)
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -386,6 +386,21 @@ struct usb_composite_driver {
 
 extern int usb_composite_probe(struct usb_composite_driver *driver);
 extern void usb_composite_unregister(struct usb_composite_driver *driver);
+
+/**
+ * module_usb_composite_driver() - Helper macro for registering a USB gadget
+ * composite driver
+ * @__usb_composite_driver: usb_composite_driver struct
+ *
+ * Helper macro for USB gadget composite drivers which do not do anything
+ * special in module init/exit. This eliminates a lot of boilerplate. Each
+ * module may only use this macro once, and calling it replaces module_init()
+ * and module_exit()
+ */
+#define module_usb_composite_driver(__usb_composite_driver) \
+       module_driver(__usb_composite_driver, usb_composite_probe, \
+                      usb_composite_unregister)
+
 extern void usb_composite_setup_continue(struct usb_composite_dev *cdev);
 extern int composite_dev_prepare(struct usb_composite_driver *composite,
                struct usb_composite_dev *cdev);