Microsoft Surface Pro 3 Type Cover keyboard

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The keyboard on the Surface Pro 3 type cover does not function without
some patching, similar to what was apparently required for the SP2
type/touch covers.

A working patch against 3.16 attached, it's an amalgamation of "some
dude posted this on the ubuntu/arch forums and it seems to work" so
I'm making no claims that it's kernel-quality! Just trying to give a
better indication of what needs to be added. My C is rudimentary and
my knowledge of the kernel limited to 'fakeroot debian/rules
updateconfigs', sorry. :)
Happy to test any improved version, but note I only have a type, not a
touch cover.

Patch source is
http://winaero.com/blog/how-to-install-linux-on-surface-pro-3/, which
in turn sources a Russian site.

c.f. https://bugzilla.kernel.org/show_bug.cgi?id=86641

Jarrad
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