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

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Date:	Thu, 24 Mar 2011 08:32:25 -0500
From:	Chris Bagwell <chris@...bagwell.com>
To:	Corentin Chary <corentin.chary@...il.com>,
	Matthew Garrett <mjg@...hat.com>,
	acpi4asus-user@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Seth Forshee <seth.forshee@...onical.com>
Subject: Re: [PATCH] eeepc-wmi: Add support for T101MT "Express Gate" key

On Thu, Mar 24, 2011 at 8:27 AM, Chris Bagwell <chris@...bagwell.com> wrote:
> On Thu, Mar 24, 2011 at 8:14 AM, Seth Forshee
> <seth.forshee@...onical.com> wrote:
>> On Thu, Mar 24, 2011 at 08:33:33AM +0100, Corentin Chary wrote:
>>> On Wed, Mar 23, 2011 at 8:39 PM, Seth Forshee
>>> <seth.forshee@...onical.com> wrote:
>>> > Signed-off-by: Seth Forshee <seth.forshee@...onical.com>
>>> > ---
>>> >
>>> > This button is unusual. On press it emits scanocde 0xe4, on release
>>> > 0xe5, and when held for a few seconds it begins emitting 0xea about
>>> > twice per second. I chose to handle only the press event in order to
>>> > make it behave like the other hotkeys.
>>> >
>>> > Probably the closest thing to the intended function of this button
>>> > would be to alternate the display orientation between portrait and
>>> > landscape, but since there doesn't appear to be a keycode defined for
>>> > that function I went with KEY_PROG2. I'm open to other suggestions
>>> > however.
>>>
>>> Hi,
>>> The manual says that under Windows, this is the "Home Key", so
>>> KEY_HOME would be more appropriate.
>>
>> The manual does call it the Home Key (I missed previously that the
>> Express Gate description referred only to the quick boot mode), but the
>> description of the key operation reads:
>>
>>  Shortly press this key to launch the Touch Gate touch screen
>>  interface. Press and hold this key to preview desktop rotation, and
>>  then release the key to finish desktop rotation.
>>
>> Which doesn't really sound like a home key to me, and the icon above the
>> button also suggests display rotation. But then we don't seem to have a
>> code for that function, so KEY_PROG2 may be no better than KEY_HOME...
>>
>>> Also, it would be great to preserve key up and key down informations
>>> (sparse keymap have an "autorelease" parameter to control that).
>>
>> Okay, I'll add some special casing for this key to support that. Do you
>> suggest ignoring the 0xea scan codes?
>>
>
> I have one of these in the mail so I'm interested in outcome.
>
> I suggest implementing as manual describes and can be handled similar
> to brightness control logic.
>
> I would suggest sending BTN_HOME upon button release 0xe5 (not press
> 0xe4 and do the autorelease because of it) and BTN_PROG2 on
> press-and-hold 0xea.
>
> If you press-and-hold, does it still send the 0xe5 upon release?  That
> could complicate things so that both button events do not get sent.
>
> I'm not sure what BTN_HOME is commonly used for.  This button does
> sound like a HOME button in iPad sense but not in web browser sense.
>
> Chris
>

When I mentioned similar to brightness control logic, I meant the
logic in eeepc-laptop and not eeepc-wmi.  It appears to use sparse
keys logic but with some event filtering.

Chris
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