Changes in sysfs-class-backlight

a1cacb8a - backlight: Add BACKLIGHT_POWER_ constants for power states

Mon, 24 Jun 2024 15:19:56 +0000

backlight: Add BACKLIGHT_POWER_ constants for power statesDuplicate FB_BLANK_ constants as BACKLIGHT_POWER__ constants in thebacklight header file. Allows backlight drivers to avoid includingthe fbdev header file and removes a compile-time dependency betweenthe two subsystems.The new BACKLIGHT_POWER_ constants have the same values as theirFB_BLANK_ counterparts. Hence UAPI and internal semantics do notchange. The backlight drivers can be converted one by one. Eachinstance of FB_BLANK_UNBLANK becomes BACKLIGHT_POWER_ON, each ofFB_BLANK_POWERDOWN becomes BACKLIGHT_POWER_OFF, and FB_BLANK_NORMALbecomes BACKLIGHT_POWER_REDUCED.Backlight code or drivers do not use FB_BLANK_VSYNC_SUSPEND andFB_BLANK_HSYNC_SUSPEND, so no new constants for these are beingadded.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 driversinterpret it as backlight on. So we keep the current code as is,but mark BACKLIGHT_POWER_REDUCED as deprecated. Drivers should befixed and the constant removed. This affects ams369fg06 and a fewDRM panel drivers.v2:- rename BL_CORE_ power constants to BACKLIGHT_POWER_ (Sam)- fix documentationSigned-off-by: Thomas Zimmermann Reviewed-by: Daniel Thompson Link: https://lore.kernel.org/r/20240624152033.25016-2-tzimmermann@suse.deSigned-off-by: Lee Jones List of files: /linux-6.15/Documentation/ABI/stable/sysfs-class-backlight

98913408 - docs: ABI: stable: make files ReST compatible

Fri, 30 Oct 2020 07:40:38 +0000

docs: ABI: stable: make files ReST compatibleSeveral entries at the stable ABI files won't parse if we passthem directly to the ReST output.Adjust them, in order to allow adding their contents as-is atthe stable ABI book.Acked-by: Srinivas Kandagatla Acked-by: Jonathan Corbet Signed-off-by: Mauro Carvalho Chehab Link: https://lore.kernel.org/r/467a0dfbcdf00db710a629d3fe4a2563750339d8.1604042072.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman List of files: /linux-6.15/Documentation/ABI/stable/sysfs-class-backlight

bb7ca747 - backlight: add backlight type

Tue, 22 Mar 2011 23:30:21 +0000

backlight: add backlight typeThere may be multiple ways of controlling the backlight on a givenmachine. Allow drivers to expose the type of interface they areproviding, making it possible for userspace to make appropriate policydecisions.Signed-off-by: Matthew Garrett Cc: Richard Purdie Cc: Chris Wilson Cc: David Airlie Cc: Alex Deucher Cc: Ben Skeggs Cc: Zhang Rui Cc: Len Brown Cc: Jesse Barnes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds List of files: /linux-6.15/Documentation/ABI/stable/sysfs-class-backlight

3c4c1b69 - video/backlight: document sysfs interface

Fri, 28 Aug 2009 12:56:43 +0000

video/backlight: document sysfs interfaceDate and KernelVersion may be wrong because the backlightinterface was introduced before git initial import.Cc:Richard Purdie Signed-off-by: Corentin Chary Signed-off-by: Len Brown List of files: /linux-6.15/Documentation/ABI/stable/sysfs-class-backlight