Messages in this thread Patch in this message | | | From | "Enrico Weigelt, metux IT consult" <> | Subject | [PATCH 1/3] include: linux: i2c: more helpers for declaring i2c drivers | Date | Mon, 17 Jun 2019 20:39:37 +0200 |
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From: Enrico Weigelt <info@metux.net>
Add more helper macros for trivial driver init cases, similar to the already existing module_i2c_driver()+friends - now for those which are initialized at other stages (eg. by subsys_initcall()).
This helps to further reduce driver init boilerplate.
Signed-off-by: Enrico Weigelt <info@metux.net> --- include/linux/i2c.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 1308126..fee59bd 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -920,6 +920,23 @@ static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg) #define builtin_i2c_driver(__i2c_driver) \ builtin_driver(__i2c_driver, i2c_add_driver) +/* subsys_i2c_driver() - Helper macro for drivers that don't 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 subsys_initcall() and module_exit() + */ +#define subsys_i2c_driver(__i2c_driver) \ +static int __init __i2c_driver##_init(void) \ +{ \ + return i2c_add_driver(&(__i2c_driver)); \ +} \ +subsys_initcall(__i2c_driver##_init); \ +static void __exit __i2c_driver##_exit(void) \ +{ \ + i2c_del_driver(&(__i2c_driver)); \ +} \ +module_exit(__i2c_driver##_exit); + #endif /* I2C */ #if IS_ENABLED(CONFIG_OF) -- 1.9.1
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