[PATCH 1/2] ACPI / video: seperate backlight control and event interface

Igor Gnatenko i.gnatenko.brain at gmail.com
Mon Sep 9 22:23:43 PDT 2013

On Mon, 2013-09-09 at 16:40 +0800, Aaron Lu wrote:
> The backlight control and event delivery functionality provided by ACPI
> video module is mixed together and registered all during video device
> enumeration time. As a result, the two functionality are also removed
> together on module unload time or by the acpi_video_unregister function.
> The two functionalities are actually independent and one may be useful
> while the other one may be broken, so it is desirable to seperate the
> two functionalities such that it is clear and easy to disable one
> functionality without affecting the other one. This patch does the
> seperation and as a result, a new video_bus_head list is introduced to
> store all registered video bus structure and a new function
> acpi_video_unregister_backlight is introduced to unregister backlight
> interfaces for all video devices belonging to stored video buses.
> Currently, there is no need to unregister ACPI video's event delivery
> functionality alone so the function acpi_video_remove_notify_handler is
> not introduced, it can be easily added when needed.
> Signed-off-by: Aaron Lu <aaron.lu at intel.com>
Tested-by: Igor Gnatenko <i.gnatenko.brain at gmail.com>
> ---
>  drivers/acpi/video.c | 451 ++++++++++++++++++++++++++++++---------------------
>  include/acpi/video.h |   2 +
>  2 files changed, 264 insertions(+), 189 deletions(-)

Igor Gnatenko
Fedora release 20 (Heisenbug)
Linux 3.11.0-3.fc20.x86_64

Igor Gnatenko
Fedora release 20 (Heisenbug)
Linux 3.11.0-1.fc20.x86_64

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