linux-kernel - [PATCH 2/5] I2C: Add helper macro for i2c

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Message-ID: <1321434819-23678-3-git-send-email-lars@metafoo.de>
Date:	Wed, 16 Nov 2011 10:13:36 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Greg Kroah-Hartman <gregkh@...e.de>,
	Jean Delvare <khali@...ux-fr.org>,
	Grant Likely <grant.likely@...retlab.ca>
CC:	Jonathan Cameron <jic23@...nel.org>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-i2c@...r.kernel.org>,
	<spi-devel-general@...ts.sourceforge.net>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH 2/5] I2C: Add helper macro for i2c_driver boilerplate

This patch introduces the module_i2c_driver macro which is a convenience macro
for I2C driver modules similar to module_platform_driver. It is intended to be
used by drivers which init/exit section does nothing but register/unregister
the I2C driver. By using this macro it is possible to eliminate a few lines of
boilerplate code per I2C driver.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
---
 include/linux/i2c.h |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index a81bf6d..7e92854 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -485,6 +485,19 @@ static inline int i2c_adapter_id(struct i2c_adapter *adap)
 {
 	return adap->nr;
 }
+
+/**
+ * module_i2c_driver() - Helper macro for registering a I2C driver
+ * @__i2c_driver: i2c_driver struct
+ *
+ * Helper macro for I2C 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_i2c_driver(__i2c_driver) \
+	module_driver(__i2c_driver, i2c_add_driver, \
+			i2c_del_driver)
+
 #endif /* I2C */
 #endif /* __KERNEL__ */
 
-- 
1.7.7.1


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