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

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Date:	Sun, 27 Mar 2011 13:32:45 -0500
From:	Chris Bagwell <chris@...bagwell.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	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,
	vojtech@...e.cz
Subject: Re: [PATCH 2/2] eeepc-wmi: Add support for T101MT Home/Express Gate key

On Sun, Mar 27, 2011 at 12:13 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Fri, Mar 25, 2011 at 01:58:24PM -0500, Seth Forshee wrote:
>> 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);
>
> Ah, right, it really did not have in mind passing on auto-repeating keys
> as is when it was written.
>
>>
>> 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?
>
> I do not thik we shoudl burden sparse-keymap with handling repeats. Just
> mark the device as auto-repeating (by setting EV_REP bit) and let input
> core autorepeat logic do it for you.

It would be nice to have this key sent roughly every 2 seconds to
re-execute a rotate script using generic key-to-script support in most
X environments.  So to use kernel auto-repeat we'd need to bump up
REP_DELAY quite a bit or do filtering in userspace.  If userspace is
filtering then its not much more work to do their own auto-repeat as
well.

If we do set up auto-repeat and increase REP_DELAY, I'm guessing this
would enable auto-repeat for all other keys defined in driver?  That
needs to have some thought on if could have negative impact (any other
keys not using auto-release?).

Chris

>
> Thanks.
>
> --
> Dmitry
>
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