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apple-gmux: Add helper for presence detect

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Centralize gmux' ACPI HID in a header file and add apple_gmux_present().
This can be used by other drivers to activate quirks specific to dual
GPU MacBook Pros & Mac Pros. The alternative would be to hardcode DMI
or PCI IDs and amend them whenever Apple introduces a new machine.

Tested-by: Lukas Wunner <[email protected]>
    [MBP  9,1 2012  intel IVB + nvidia GK107  pre-retina  15"]
Signed-off-by: Lukas Wunner <[email protected]>
Reviewed-by: Darren Hart <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/89c23769058a340e5e11d4a7102f3793d3b0c94c.1452525860.git.lukas@wunner.de
This commit is contained in:
Lukas Wunner 2016-01-11 20:09:20 +01:00 • committed by Daniel Vetter
commit 2413306c25
3 changed files with 45 additions and 1 deletions
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4
Documentation/DocBook/gpu.tmpl
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@ -3451,6 +3451,10 @@ int num_ioctls;</synopsis>
<title>Backlight control</title>
!Pdrivers/platform/x86/apple-gmux.c Backlight control
</sect2>
<sect2>
<title>Public functions</title>
!Iinclude/linux/apple-gmux.h
</sect2>
</sect1>
</chapter>