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miscdevice: Add helper macro for misc device boilerplate

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Many modules call misc_register and misc_deregister in its module init
and exit methods without any additional code. This ends up being
boilerplate. This patch adds helper macro module_misc_device(), that
replaces module_init()/ module_exit() with template functions.

This patch also converts drivers to use new macro.

Change since v1:
Add device.h include in miscdevice.h as module_driver macro was not
available from other include files in some architectures.

Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
PrasannaKumar Muralidharan
2016-08-25 22:30:49 +05:30
committed by Greg Kroah-Hartman
parent 832c8232dd
commit ca75d601b5
7 changed files with 15 additions and 80 deletions
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8
include/linux/miscdevice.h
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@@ -3,6 +3,7 @@
#include <linux/major.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/device.h>
/*
* These allocations are managed by device@lanana.org. If you use an
@@ -70,6 +71,13 @@ struct miscdevice {
extern int misc_register(struct miscdevice *misc);
extern void misc_deregister(struct miscdevice *misc);
/*
* Helper macro for drivers that don't do anything special in module init / exit
* call. This helps in eleminating of boilerplate code.
*/
#define module_misc_device(__misc_device) \
module_driver(__misc_device, misc_register, misc_deregister)
#define MODULE_ALIAS_MISCDEV(minor) \
MODULE_ALIAS("char-major-" __stringify(MISC_MAJOR) \
"-" __stringify(minor))