linux-kernel - Re: Vibrations in input vs. LED was Re: [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer

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Date:   Fri, 6 Oct 2017 13:48:59 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        David Lin <dtwlin@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Richard Purdie <rpurdie@...ys.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Rom Lemarchand <romlem@...gle.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>
Subject: Re: Vibrations in input vs. LED was Re: [PATCH v2 0/3] led:
 ledtrig-transient: add support for hrtimer

On Wed 2017-09-20 22:08:42, Jacek Anaszewski wrote:
> On 09/20/2017 01:29 PM, Pavel Machek wrote:
> >>>>> I'd leave the decision to the user. We could add a note to the
> >>>>> Documentation/leds/ledtrig-transient.txt that force feedback interface
> >>>>> should be preferable choice for driving vibrate devices.
> >>>>> However only if following conditions are met:
> >>>>
> >>>> What I meant is that it is my decision, as a LED subsystem maintainer,
> >>>> to accept the addition of a note about some other subsystem offering
> >>>> an equivalent or even better substitute of the feature being available
> >>>> in the subsystem I am responsible for. And I will accept such a patch
> >>>> only if mentioned conditions are met.
> >>>
> >>> Having the wording in documentation does not in any way stops Android
> >>> folks from continuing [ab]using the transient trigger. But this is
> >>> their choice. The purpose of documentation is to document the best
> >>> practices, not all possible crazy solutions one can come up with.
> >>
> >> Yes. but if the information has been in place for years, we can't
> >> just remove it without giving an instruction on how to use the
> >> substitute.
> > 
> > I gave you information how to use the substitute.
> 
> That information was quite vague. I'd like to see a sample application
> in tools/input.

So please write it.

> > I already suggested patch to documentation. If you do the same, maybe
> > we can agree on documentation update.
> 
> Your patch was just removing few lines of documentation. I'd expect more
> empathic approach to the current users, i.e.:
> 
> - pointer to the sample application in tools/input showing how to
>   setup gpio driven vibrate device with use of ff interface with
>   1kHz vibration frequency.

Yes, my patch is removing dangerously misleading documentation about
LED subsystem.

Please apply it.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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