The backlight support has three properties that express the state: - power - state - fb_blank
It is un-documented and easy to get wrong. Add backlight_is_blank() helper to make it simpler for drivers to get the check of the state correct.
A lot of drivers also includes checks for fb_blank. This check is redundant when the state is checked and thus not needed in this helper function. But added anyway to avoid introducing subtle bugs due to the creative use of fb_blank in some drivers. Introducing this helper will for some drivers results in added support for fb_blank. This will be a change in functionality, which will improve the backlight driver.
Rolling out this helper to all relevant backlight drivers will eliminate almost all accesses to fb_blank.
v5: - Improved changelog, added fb_blank to properties that express state (Daniel)
v4: - struct backlight_device * is now const
v3: - Clarified that the fb_blank support in backlight_is_blank() may result in functionality changes for the users (Emil)
v2: - Added fb_blank condition (Daniel)
Signed-off-by: Sam Ravnborg sam@ravnborg.org Reviewed-by: Daniel Thompson daniel.thompson@linaro.org Reviewed-by: Peter Ujfalusi peter.ujfalusi@ti.com Reviewed-by: Emil Velikov emil.l.velikov@gmail.com Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Cc: Emil Velikov emil.l.velikov@gmail.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Lee Jones lee.jones@linaro.org Cc: Daniel Thompson daniel.thompson@linaro.org Cc: Jingoo Han jingoohan1@gmail.com --- include/linux/backlight.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/include/linux/backlight.h b/include/linux/backlight.h index 56e4580d4f55..56e51ebab740 100644 --- a/include/linux/backlight.h +++ b/include/linux/backlight.h @@ -175,6 +175,25 @@ static inline void backlight_put(struct backlight_device *bd) put_device(&bd->dev); }
+/** + * backlight_is_blank - Return true if display is expected to be blank + * @bd: the backlight device + * + * Display is expected to be blank if any of these is true:: + * + * 1) if power in not UNBLANK + * 2) if fb_blank is not UNBLANK + * 3) if state indicate BLANK or SUSPENDED + * + * Returns true if display is expected to be blank, false otherwise. + */ +static inline bool backlight_is_blank(const struct backlight_device *bd) +{ + return bd->props.power != FB_BLANK_UNBLANK || + bd->props.fb_blank != FB_BLANK_UNBLANK || + bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK); +} + extern struct backlight_device *backlight_device_register(const char *name, struct device *dev, void *devdata, const struct backlight_ops *ops, const struct backlight_properties *props);