acpi-video-detect: Rewrite backlight interface selection logic
authorHans de Goede <hdegoede@redhat.com>
Tue, 16 Jun 2015 14:27:48 +0000 (16:27 +0200)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Thu, 18 Jun 2015 23:10:44 +0000 (01:10 +0200)
commit87521e16a7abbf3fa337f56cb4d1e18247f15e8a
tree63ae44bbc4a4aaf0b48f03536c825d36baaf4238
parent14ca7a47d0ab2a7a35faab130e6d9682f8ff1a46
acpi-video-detect: Rewrite backlight interface selection logic

Currently we have 2 kernel commandline options + dmi-quirks in 3 places all
interacting (in interesting ways) to select which which backlight interface
to use. On the commandline we've acpi_backlight=[video|vendor] and
video.use_native_backlight=[0|1]. DMI quirks we have in
acpi/video-detect.c, acpi/video.c and drivers/platform/x86/*.c .

This commit is the first step to cleaning this up, replacing the 2 cmdline
options with just acpi_backlight=[video|vendor|native|none], and adds a
new API to video_detect.c to reflect this.

Follow up commits will also move other related code, like unregistering the
acpi_video backlight interface if it was registered before other drivers
which take priority over it are loaded, to video_detect.c where this
logic really belongs.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/acpi/video_detect.c
include/acpi/video.h