Re: [RFC PATCH 2/3] platform/x86: Add Uniwill laptop driver

[Lee Jones <lee@kernel.org>]

On Thu, 19 Jun 2025, Hans de Goede wrote:

> Hi Lee,
> 
> On 19-Jun-25 11:47 AM, Lee Jones wrote:
> > On Tue, 17 Jun 2025, Armin Wolf wrote:
> > 
> >> Am 16.06.25 um 14:46 schrieb Werner Sembach:
> >>
> >>> Hi, small additon
> >>>
> >>> Am 15.06.25 um 19:59 schrieb Armin Wolf:
> >>>> +        functionality.
> >>>> +
> >>>> +What: /sys/bus/wmi/devices/ABBC0F6F-8EA1-11D1-00A0-C90629100000[-X]/rainbow_animation
> >>>> +Date:        Juni 2025
> >>>> +KernelVersion:    6.17
> >>>> +Contact:    Armin Wolf <W_Armin@gmx.de>
> >>>> +Description:
> >>>> +        Forces the integrated lightbar to display a rainbow
> >>>> animation when the machine
> >>>> +        is not suspended. Writing "enable"/"disable" into this file
> >>>> enables/disables
> >>>> +        this functionality.
> >>>> +
> >>>> +        Reading this file returns the current status of the rainbow
> >>>> animation functionality.
> >>>> +
> >>>> +What: /sys/bus/wmi/devices/ABBC0F6F-8EA1-11D1-00A0-C90629100000[-X]/breathing_in_suspend
> >>>> +Date:        Juni 2025
> >>>> +KernelVersion:    6.17
> >>>> +Contact:    Armin Wolf <W_Armin@gmx.de>
> >>>> +Description:
> >>>> +        Causes the integrated lightbar to display a breathing
> >>>> animation when the machine
> >>>> +        has been suspended and is running on AC power. Writing
> >>>> "enable"/"disable" into
> >>>> +        this file enables/disables this functionality.
> >>>> +
> >>>> +        Reading this file returns the current status of the
> >>>> breathing animation
> >>>> +        functionality.
> >>>
> >>> maybe this would be better under the /sys/class/leds/*/ tree if possible
> >>
> >> I CCed the LED mailing list so that they can give us advice on which location is the preferred one for new drivers.
> > 
> > No need to involve the LED subsystem for a hardware function controlled
> > by a single register value just because the interface involves an LED.
> 
> Lee, the question here is where put the sysfs attribute to put the lightbar
> in breathing mode e.g. which of these 2 should be used?  :
> 
> 1. /sys/bus/wmi/devices/ABBC0F6F-8EA1-11D1-00A0-C90629100000[-X]/breathing_in_suspend
> 2. /sys/class/leds/uniwill-lightbar/breathing_in_suspend
> 
> I think this is a fair question and since 2. involves the LED class userspace
> API I also think that asking for the LED maintainers input is reasonable.
> 
> FWIW I'm not sure myself. 2. is the more logical place / path. But 2. adds
> a custom sysfs attr the LED class device. Whereas 1. adds a custom sysfs attr
> in a place where these are more or less expected.

Right.  It was a reasonable question.  Did I imply otherwise?

If it wasn't clear, my vote (this is not a dictatorship) is for 1.

-- 
Lee Jones [李琼斯]