Device registration almost always uses a struct backlight_properties variable to pass config info. Make it simpler and less error prone by the introduction of a number of macros.
There is one macro for each type of backlight {firmware, platform, raw}. All members in struct backlight_properties are initialized.
Signed-off-by: Sam Ravnborg sam@ravnborg.org Cc: Lee Jones lee.jones@linaro.org Cc: Daniel Thompson daniel.thompson@linaro.org Cc: Jingoo Han jingoohan1@gmail.com --- include/linux/backlight.h | 45 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+)
diff --git a/include/linux/backlight.h b/include/linux/backlight.h index 190963ffb7fc..d683c053ec09 100644 --- a/include/linux/backlight.h +++ b/include/linux/backlight.h @@ -272,6 +272,51 @@ struct backlight_properties { enum backlight_scale scale; };
+#define BACKLIGHT_PROPS(_brightness, _max_brightness, _type) \ + .brightness = _brightness, \ + .max_brightness = _max_brightness, \ + .power = FB_BLANK_POWERDOWN, \ + .type = _type, \ + .fb_blank = 0, \ + .state = 0, \ + .scale = BACKLIGHT_SCALE_UNKNOWN, + +/** + * DECLARE_BACKLIGHT_INIT_RAW - backlight_properties to init a raw + * backlight device + * + * This macro is used to initialize backlight_properties that is used when + * registering a raw backlight device. + */ +#define DECLARE_BACKLIGHT_INIT_RAW(name, _brightness, _max_brightness) \ + const struct backlight_properties name = { \ + BACKLIGHT_PROPS(_brightness, _max_brightness, BACKLIGHT_RAW) \ + } + +/** + * DECLARE_BACKLIGHT_INIT_PLATFORM - backlight_properties to init a platform + * backlight device + * + * This macro is used to initialize backlight_properties that is used when + * registering a platform backlight device. + */ +#define DECLARE_BACKLIGHT_INIT_PLATFORM(name, _brightness, _max_brightness) \ + const struct backlight_properties name = { \ + BACKLIGHT_PROPS(_brightness, _max_brightness, BACKLIGHT_PLATFORM) \ + } + +/** + * DECLARE_BACKLIGHT_INIT_FIRMWARE - backlight_properties to init a firmware + * backlight device + * + * This macro is used to initialize backlight_properties that is used when + * registering a firmware backlight device. + */ +#define DECLARE_BACKLIGHT_INIT_FIRMWARE(name, _brightness, _max_brightness) \ + const struct backlight_properties name = { \ + BACKLIGHT_PROPS(_brightness, _max_brightness, BACKLIGHT_FIRMWARE) \ + } + /** * struct backlight_device - backlight device data *