linux-kernel - [PATCH] staging: comedi: Add helper macro for comedi

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Date:	Tue, 1 May 2012 17:20:04 -0700
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
CC:	<devel@...verdev.osuosl.org>, <abbotti@....co.uk>,
	<fmhess@...rs.sourceforge.net>, <gregkh@...uxfoundation.org>
Subject: [PATCH] staging: comedi: Add helper macro for comedi_driver boilerplate

Introduce the module_comedi_driver macro which is a convenience
macro for comedi driver modules similar to module_platform_driver.
It is intended to be used by drivers where the init/exit section
does nothing but register/unregister the comedi driver. By using
this macro it is possible to eliminate a few lines of boilerplate
code per comedi driver.

Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: Ian Abbott <abbotti@....co.uk>
Cc: Mori Hess <fmhess@...rs.sourceforge.net>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation

---

diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index 02e4ae0..8828609 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -298,6 +298,18 @@ int comedi_device_attach(struct comedi_device *dev,
 int comedi_driver_register(struct comedi_driver *);
 int comedi_driver_unregister(struct comedi_driver *);
 
+/**
+ * module_comedi_driver() - Helper macro for registering a comedi driver
+ * @__comedi_driver: comedi_driver struct
+ *
+ * Helper macro for comedi 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_comedi_driver(__comedi_driver) \
+	module_driver(__comedi_driver, comedi_driver_register, \
+			comedi_driver_unregister)
+
 void init_polling(void);
 void cleanup_polling(void);
 void start_polling(struct comedi_device *);
--
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