kernel/linux.git/include/linux/backlight.h, branch v6.12.80

backlight: Add BACKLIGHT_POWER_ constants for power states

2024-07-04T15:45:25+00:00

Duplicate FB_BLANK_ constants as BACKLIGHT_POWER__ constants in the backlight header file. Allows backlight drivers to avoid including the fbdev header file and removes a compile-time dependency between the two subsystems. The new BACKLIGHT_POWER_ constants have the same values as their FB_BLANK_ counterparts. Hence UAPI and internal semantics do not change. The backlight drivers can be converted one by one. Each instance of FB_BLANK_UNBLANK becomes BACKLIGHT_POWER_ON, each of FB_BLANK_POWERDOWN becomes BACKLIGHT_POWER_OFF, and FB_BLANK_NORMAL becomes BACKLIGHT_POWER_REDUCED. Backlight code or drivers do not use FB_BLANK_VSYNC_SUSPEND and FB_BLANK_HSYNC_SUSPEND, so no new constants for these are being added. The semantics of FB_BLANK_NORMAL appear inconsistent. In fbdev, NORMAL means display off with sync enabled. In backlight code, this translates to turn the backlight off, but some drivers interpret it as backlight on. So we keep the current code as is, but mark BACKLIGHT_POWER_REDUCED as deprecated. Drivers should be fixed and the constant removed. This affects ams369fg06 and a few DRM panel drivers. v2: - rename BL_CORE_ power constants to BACKLIGHT_POWER_ (Sam) - fix documentation Signed-off-by: Thomas Zimmermann Reviewed-by: Daniel Thompson Link: https://lore.kernel.org/r/20240624152033.25016-2-tzimmermann@suse.de Signed-off-by: Lee Jones

Merge branches 'ib-backlight-auxdisplay-staging-omap-6.9', 'ib-backlight-auxdisplay-hid-fb-6.9' and 'ib-backlight-hid-fbdev-lcd-scripts-6.10' into ibs-for-backlight-merged

2024-05-10T14:43:31+00:00

backlight: Remove fb_blank from struct backlight_properties

2024-03-28T10:16:26+00:00

Remove the field fb_blank from struct backlight_properties and remove all code that still sets or reads it. Backlight blank status is now tracked exclusively in struct backlight_properties.state. The core backlight code keeps the fb_blank and state fields in sync, but doesn't do anything else with fb_blank. Several drivers initialize fb_blank to FB_BLANK_UNBLANK to enable the backlight. This is already the default for the state field. So we can delete the fb_blank code from core and drivers and rely on the state field. Signed-off-by: Thomas Zimmermann Cc: Flavio Suligoi Cc: Nicolas Ferre Cc: Alexandre Belloni Cc: Claudiu Beznea Tested-by: Flavio Suligoi Reviewed-by: Daniel Thompson Reviewed-by: Dan Carpenter Link: https://lore.kernel.org/r/20240319093915.31778-7-tzimmermann@suse.de Signed-off-by: Lee Jones

backlight: Add controls_device callback to struct backlight_ops

2024-03-28T10:09:06+00:00

Replace check_fb with controls_device in struct backlight_ops. The new callback interface takes a Linux device instead of a framebuffer. Resolves one of the dependencies of backlight.h on fb.h. The few drivers that had custom implementations of check_fb can easily use the framebuffer's Linux device instead. Update them accordingly. Signed-off-by: Thomas Zimmermann Reviewed-by: Daniel Thompson Reviewed-by: Javier Martinez Canillas Link: https://lore.kernel.org/r/20240305162425.23845-11-tzimmermann@suse.de Signed-off-by: Lee Jones

backlight: backlight: Make of_find_backlight static

2020-07-20T09:27:11+00:00

There are no external users of of_find_backlight, as they have all changed to use the managed version. Make of_find_backlight static to prevent new external users. Signed-off-by: Sam Ravnborg Reviewed-by: Daniel Thompson Signed-off-by: Lee Jones

backlight: backlight: Drop backlight_put()

2020-07-20T09:27:09+00:00

There are no external users of backlight_put(). Drop it and open code the two users in backlight.c. Signed-off-by: Sam Ravnborg Reviewed-by: Daniel Thompson Signed-off-by: Lee Jones

backlight: backlight: Introduce backlight_get_brightness()

2020-07-20T09:27:02+00:00

Based on an idea from Emil Velikov, add a helper that checks backlight_is_blank() and return 0 as brightness if display is blank or the property value if not. This allows us to simplify the update_status() implementation in most of the backlight drivers. Signed-off-by: Sam Ravnborg Reviewed-by: Daniel Thompson Signed-off-by: Lee Jones

backlight: backlight: Drop extern from prototypes

2020-07-20T09:26:10+00:00

No need to put "extern" in front of prototypes. While touching the prototypes adjust indent to follow the kernel style. Signed-off-by: Sam Ravnborg Reviewed-by: Daniel Thompson Reviewed-by: Emil Velikov Signed-off-by: Lee Jones

backlight: generic_bl: Remove this driver as it is unused

2020-07-20T09:26:08+00:00

The backlight_bl driver required initialization using struct generic_bl_info. As there are no more references to this struct there is no users left. So it is safe to delete the driver. Signed-off-by: Sam Ravnborg Reviewed-by: Daniel Thompson Reviewed-by: Emil Velikov Signed-off-by: Lee Jones

backlight: backlight: Document enums in backlight.h

2020-07-20T09:26:07+00:00

Add kernel-doc documentation for the backlight enums Signed-off-by: Sam Ravnborg Reviewed-by: Daniel Thompson Reviewed-by: Emil Velikov Signed-off-by: Lee Jones