This adds a driver for extra function keys on certain Xiaomi laptops.

Unlike the existing xiaomi-wmi driver where each key has its own WMI
GUID, this machine delivers all keys through a single event GUID
(B74AF83F-...), encoding the event type and keycode in the event buffer.

I was unsure whether this should be merged into the existing xiaomi-wmi.c
or kept separate due to the different mechanism. I chose a separate file
for clarity; happy to merge if preferred.

Tested on Xiaomi Mi Gaming Laptop (8th gen Intel).

Lucy Wong (1):
  platform/x86: add Xiaomi WMI key driver

 MAINTAINERS                            |   6 ++
 drivers/platform/x86/Kconfig           |  11 ++
 drivers/platform/x86/Makefile          |   1 +
 drivers/platform/x86/xiaomi-wmi-keys.c | 139 +++++++++++++++++++++++++
 4 files changed, 157 insertions(+)
 create mode 100644 drivers/platform/x86/xiaomi-wmi-keys.c

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2.54.0