linux-kernel - Re: [PATCH] hwmon: (oxp-sensors) Add tt_toggle attribute on supported boards

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Date:   Wed, 31 May 2023 09:46:21 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Joaquin Aramendia <samsagax@...il.com>
Cc:     derekjohn.clark@...il.com, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (oxp-sensors) Add tt_toggle attribute on supported
 boards

On 5/31/23 05:04, Joaquin Aramendia wrote:
>> This attribute is a no-go. It is not even remotely related to hardware
>> monitoring, and thus must not be attached to the hwmon device.
>>
>> I don't know exactly where it belongs, but it appears to be related
>> to the keyboard. Its natural place therefore seems to be a keyboard driver.
>> We could possibly also attach it to the platform device, but there would
>> have to be some precedence of other drivers doing the same. Question
>> in that case though would be if this is just the first of many attributes
>> to come. If so, we would need to find a different solution.
>>
>> Guenter
> 
> Sure! Should this driver with those changes go into a platform driver?

You are attaching the attribute to the hwmon device. Moving the driver
to another directory would just be an attempt to avoid review by a
hwmon maintainer. Just for that reason I would NACK such an attempt.

Guenter

> Seems a better fit to me. The case against keyboard driver is the
> switch changes behaviour of the key but both the behaviour with the
> switch on and off is device defined. Some use the key as part of an AT
> Translated Keyboard and others just operate on the EC itself to grab
> the fan and set a special TDP for "Silent mode".
> For now this is the first such attribute found by the community and
> some talks with the manufacturer but it doesn't mean there wouldn't be
> others. Specially with such new form factors adding some "control
> panels" on Windows to set some hardware behaviour via EC writes. My
> goal is to allow those same functions to be available to linux users
> in a way some other userspace tools can serve as front ends.
> 
> Would taking this same driver to the platform side be a solution to
> that going forward? It would be a combination of hwmon monitoring
> attributes and some other special functions with custom attributes.
> Seems a better fit to me.