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:   Wed, 20 Sep 2017 22:08:42 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Pavel Machek <pavel@....cz>
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 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.

> 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.


-- 
Best regards,
Jacek Anaszewski