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Subjectinput question: ambient light sensor button

I do not know where to ask this question, but I think that kernel
developers could help me.

I have notebook with one special button on keyboard which is
designed for turning ambient light sensor on and off. By default
pressing button do nothing (I can turn ambient light sensor on/off
via sysfs platform wmi module). Button press is reported by
kernel input device AT Translated Set 2 keyboard and reports it
as button "touchpad off".

Of course "touchpad off" is incorrect and I'd like to ask which
kernel key or button from /usr/include/linux/input.h should be
mapped for my ambient light sensor button? Is there already some?
And what is strategy for allocating KEY_* and BTN_* numbers?

I'd like to know this, so udev could have correct DMI keymap
hooks and other userspace programs can understand ambient light
sensor button correctly.

Pali Rohár
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