How to implement ACPI EC support?

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Hi Henrique,

I've noticed the ACPI embedded controller (EC) support in the
"thinkpad_acpi" driver.

New Samsung laptops (NP530U3C, NP900X4B, NP900X3C, ...) also have an EC
which isn't supported by the generic ACPI driver. The lid, the battery
status and the power supply status are connected to it.

How did you implement the EC support in the thinkpad driver? Did you
have documentation or was it done by reverse engineering?

Could you have a look at the related kernel bugzilla bugs?:

https://bugzilla.kernel.org/show_bug.cgi?id=45461
https://bugzilla.kernel.org/show_bug.cgi?id=44161

Cheers,
Sebastian

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