Messages in this thread | | | From | Seth Forshee <> | Subject | [PATCH 0/3] apple_bl: Add support for gmux backlight control | Date | Fri, 3 Feb 2012 14:28:01 -0600 |
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Many models of Apple laptops have a gmux device, whose primary purpose seems to be controlling the display mux in these machines. The gmux often also supports adjustment of screen brightness, and in some cases it is the only working method available for adjusting the backlight.
This series adds support to apple_bl for gmux backlight control, along with some driver reworking to better support this device. While I was at it I went ahead and threw in a patch to convert the printks to pr_<level>.
I've been able to get these changes tested on several different models of MacBooks, and the functioning of the existing backlight support is unaffected. On some models the gmux is present but does not control screen brightness. I haven't found any way to detect this in software though, as the reads and writes to the backlight control ports behave identically to when the gmux can control the backlight.
Thanks, Seth
Seth Forshee (3): apple_bl: Convert printks to pr_<level> apple_bl: Rework in advance of gmux backlight support apple_bl: Add support for gmux backlight control
drivers/video/backlight/apple_bl.c | 329 +++++++++++++++++++++++++----------- 1 files changed, 230 insertions(+), 99 deletions(-)
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