Re: Missing ACPI driver for a keyboard button in Xiaomi RedmiBook Pro 16

[Nikita Krasnov <nikita.nikita.krasnov@gmail.com>]

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Hello again!

Sorry for taking so long. Real life stuff gets in the way :(

On Tue, Jul 22, 2025 at 07:09:37PM +0300 Armin Wolf wrote:
> Take a look at https://docs.kernel.org/wmi/driver-development-guide.html.

Thanks! Coupled with articles [1] and [2] this was a very good
introduction to WMI and ACPI.

> Sure, but you have to develop a new WMI driver for your device because after looking at the
> ACPI tables (SSDT20 in particular) i came to the conclusion that the xiaomi-wmi driver cannot
> be used in this case.

Why is that? Is it because xiaomi-wmi is using deprecated GUID-based WMI
interface?

Btw, it's so weird for me that there are many laptop models, but only
one *-wmi.c file per manufacturer (be it Xiaomi, ThinkPad, MSI or Asus).
Is it because most of the time we write a driver for a specific piece of
hardware that may be reused in different laptop models?

> I suggest that you write a skeleton driver first that basically prints
> the content of this buffer to the kernel log using print_hex_dump_bytes().

About that... Would you be okay with me implementing this driver in
Rust? I assume it's you, an ACPI WMI DRIVER maintainer, whose permission
needs to be granted to green-light this?

[1]: https://lwn.net/Articles/391230/
[2]: https://lwn.net/Articles/367630/

--
Nikita Krasnov

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