linux-kernel - Re: [PATCH 2/2] eeepc-wmi: Add support for T101MT Home/Express Gate key

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Message-ID: <20110325185824.GE14328@thinkpad-t410>
Date:	Fri, 25 Mar 2011 13:58:24 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Corentin Chary <corentin.chary@...il.com>,
	Chris Bagwell <chris@...bagwell.com>,
	Matthew Garrett <mjg@...hat.com>,
	acpi4asus-user@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	vojtech@...e.cz
Subject: Re: [PATCH 2/2] eeepc-wmi: Add support for T101MT Home/Express Gate
 key

On Fri, Mar 25, 2011 at 10:03:33AM -0700, Dmitry Torokhov wrote:
> > So, would the following make sense (KEY_TBD is may abbreviation for "key
> > to be determinded"):
> > 
> >  - On press (0xe4), send KEY_TBD, value = 1
> >  - On hold (0xea), send KEY_TBD, value = 2
> >  - On release (0xe5), send KEY_TBD, value = 0
> 
> Yes.

There's a little problem with this. The driver uses sparse-keymap, which
calls input_report_key(), which is doing this:

	input_event(dev, EV_KEY, code, !!value);

I don't see the hold events in userspace, so they must be getting
dropped as duplicates as you suggested.

I'm not sure who is at fault here. Should input_report_key() not be
forcing value to 0 or 1? Or should sparse-keymap be calling
input_event() directly? Or is sparse-keymap the wrong tool for handling
keys this way?

Thanks,
Seth

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