Re: [QUESTION] fan rpm hwmon driver

["Barnabás Pőcze" <pobrn@protonmail.com>]

2020. július 4., szombat 22:54 keltezéssel, Guenter Roeck írta:
> On 7/4/20 12:50 PM, Barnabás Pőcze wrote:
>
> > Hello all,
> > I am completely new to Linux kernel development. I have written a kernel module for my laptop that integrates the fan speeds available in the embedded controller memory into the hwmon subsystem.
> > My first question would be: can such a driver be merged into the mainline? I ask this because it is a device specific driver, and I am not sure if such drivers are wanted in the mainline.
>
> There are several device/platform specific drivers in drivers/hwmon;
> that is not a problem. Question is more how the EC is accessed, and

It is accessed using the acpi/ec driver.


> who is going to maintain the driver after the initial submission.
> This might be easier to evaluate if we had a patch or a pointer to,
> for example, an out-of-tree driver at a public repository site such
> as github.
>

I uploaded it to github, I hope it helps: https://github.com/pobrn/xmg_fusion_15_fans
I apologize for stylistic inconsistencies and such in the code, this is more or less a work in progress (at least in terms of making it an "acceptable" kernel module).


> > Depending on the answer to my first question, my second question is: where should such a driver reside in the source tree? Initially, I thought of drivers/hwmon, but that seems to be occupied by drivers for external(?) devices (I am not sure, but that is the idea I get). So I am now thinking of drivers/platform/x86. However, I have failed to find any fan hwmon drivers there, so I am not sure about that one, either.
>
> hwmon drivers should in general reside in drivers/hwmon, unless hardware
> monitoring functionality is part of other functionality and would be
> difficult to extract from the main driver (example: various Ethernet
> or graphics controllers).
>
> Guenter


Thanks for the reply.

Barnabás Pőcze