diff options
Diffstat (limited to 'include/linux/device')
| -rw-r--r-- | include/linux/device/driver.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h index 768a1334c0a1..29fbc01ef06f 100644 --- a/include/linux/device/driver.h +++ b/include/linux/device/driver.h @@ -297,4 +297,35 @@ static int __init __driver##_init(void) \ } \ device_initcall(__driver##_init); +/** + * subsys_driver() - Helper macro for drivers that don't do anything special + * in init/exit but have to register earlier, at subsys_initcall level, when + * built in. This eliminates a lot of boilerplate. Each driver may only use + * this macro once, and calling it replaces the init/exit boilerplate. + * + * @__driver: driver name + * @__register: register function for this driver type + * @__unregister: unregister function for this driver type + * @...: Additional arguments to be passed to __register and __unregister. + * + * This is meant to be a direct parallel of module_driver() above, but with + * the init call promoted to subsys_initcall() for built-in drivers so they + * are available earlier during boot. When built as a module subsys_initcall() + * collapses to module_init() and the normal module init/exit paths are used. + * + * Use this macro to construct bus specific macros for registering drivers, + * and do not use it on its own. + */ +#define subsys_driver(__driver, __register, __unregister, ...) \ +static int __init __driver##_init(void) \ +{ \ + return __register(&(__driver), ##__VA_ARGS__); \ +} \ +subsys_initcall(__driver##_init) \ +static void __exit __driver##_exit(void) \ +{ \ + __unregister(&(__driver), ##__VA_ARGS__); \ +} \ +module_exit(__driver##_exit) + #endif /* _DEVICE_DRIVER_H_ */ |