Re: Vibrations in input vs. LED was Re: [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer
From: Pavel Machek
Date: Fri Oct 06 2017 - 07:49:19 EST
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
Please apply it.
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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