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USB: Add helper macro for usb_driver boilerplate

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This patch introduces the module_usb_driver macro which is a convenience
macro for USB 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 USB driver. By using this macro it is possible
to eliminate a few lines of boilerplate code per USB driver.

Based on work done by Lars-Peter Clausen <lars@metafoo.de> for other
busses (i2c and spi).

Cc: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2011-11-17 14:38:33 -08:00
commit f3a6a4b6cf
1 changed files with 12 additions and 0 deletions
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12
include/linux/usb.h
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@ -953,6 +953,18 @@ extern int usb_register_driver(struct usb_driver *, struct module *,
extern void usb_deregister(struct usb_driver *);
/**
* module_usb_driver() - Helper macro for registering a USB driver
* @__usb_driver: usb_driver struct
*
* Helper macro for USB 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_driver(__usb_driver) \
module_driver(__usb_driver, usb_register, \
usb_deregister)
extern int usb_register_device_driver(struct usb_device_driver *,
struct module *);
extern void usb_deregister_device_driver(struct usb_device_driver *);