linux-kernel - Re: Re: [PATCH 4/8] Input: twl6040-vibra: Check the selected path for vibra

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Date:	Fri, 23 Sep 2011 23:00:41 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Péter Ujfalusi <peter.ujfalusi@...com>
Cc:	Samuel Ortiz <samuel.ortiz@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org,
	Misael Lopez Cruz <misael.lopez@...com>,
	linux-input@...r.kernel.org
Subject: Re: Re: [PATCH 4/8] Input: twl6040-vibra: Check the selected path
 for vibra

On Fri, Sep 16, 2011 at 09:42:16AM +0300, Péter Ujfalusi wrote:
> On Thursday 15 September 2011 23:27:20 Dmitry Torokhov wrote:
> > This is not very helpful for the application trying to use the device.
> > Maybe we should zap the device when channels are routed through audio
> > instead of dripping requests?
> 
> Yes, I have thought about that as well, but it can cause other problems.
> I have modified the fftest tool from:
> http://www.koders.com/c/fidF60D5962FCA8B937A6D0947AA81AE95A8C58FB36.aspx
> for my needs.
> It opens the /dev/input/eventX, and it will keep it open as long as it is 
> running.
> It is OK for me, since the twl6040-vibra goes to low power mode when we do not 
> have effects running.
> I can imagine, that real world application will do the same, and that might 
> cause some problems, if I try to zap the device.
> Can we zap a device, while it is open?
> How application will handle that event?

The application will get an error on read or write, like -ENODEV, and will
hopefully "drop off".

-- 
Dmitry
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