Re: [PATCH 1/1] input: ff-memless: Change FF_ENVELOPE_INTERVAL to a module parameter.

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Kalle,

On Fri, Aug 28, 2015 at 02:56:33PM +0300, Kalle Jokiniemi wrote:
> Sometimes you need to have tighter control over the ff-memless
> effects. E.g. when creating short button / VKB press effects,
> the effect duration is typically <= 40ms, and you want to have
> a short acceleration period in beginning and fade out the end
> to avoid "electric tooth brush" effect. With 50ms envelope
> interval this control is not possible.
> 
> To allow this control without patching over ff-memless, change the
> FF_ENVELOPE_INTERVAL macro to a module parameter that can be modified
> via kernel command line or during runtime from
> /sys/module/ff_memless/parameters/ff_envelope_interval sysfs file.

How would users know that they need to change this parameter? Could we
maybe adjust sampling time dynamically, based on the attack length of
the envelope?

Thanks.

-- 
Dmitry