linux-kernel - Re: [patch 2/3] acpi: Add a docked sysfs file to the dock driver.

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Date:	Wed, 13 Dec 2006 10:56:56 +0100
From:	Stefan Schmidt <stefan@...enfreihafen.org>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Holger Macht <hmacht@...e.de>, len.brown@...el.com,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Brandon Philips <brandon@...p.org>, Greg KH <greg@...ah.com>
Subject: Re: [patch 2/3] acpi: Add a docked sysfs file to the dock driver.

Hello.

On Wed, 2006-12-13 at 10:14, Kay Sievers wrote:
> On Wed, 2006-12-13 at 00:26 +0100, Stefan Schmidt wrote:
> > On Tue, 2006-12-12 at 15:00, Kristen Carlson Accardi wrote:
> > > 
> > > I did have different dock/undock events a few months ago - but
> > > after some discussion we scrapped them because Kay wants to avoid driver
> > > specific events.  The "change" event is the only thing that makes sense,
> > > given the set of uevents available right now, and userspace should be 
> > > able to handle checking a file to get driver specific details (i.e. dock 
> > > and undock status).  If you have a specific reason why this won't work,
> > > let me know.
> > 
> > It's fine with me. I just find two different events more handy.
> > Checking the file after the event in userspace should not be aproblem.
> 
> The thing is that we try to avoid driver-core "features" that are
> specific to a single subsystem or driver.
> 
> You can easily add additional environment variables today, while sending
> a "change"-event with kobject_uevent_env(), like
> ACPI_DOCK={lock,unlock,insert,remove,...}. Just pass any driver-specific
> string you like along with the event, and it will be available just like
> the "action" string.

Thanks for the explanation. I can live with both solutions. It's up to
Kristen.

> This should fit all requirements, without the need to introduce all
> sorts of new generic action-strings, that can almost never be changed
> later for compatibility reasons. That way, if "drivers" later find out,
> that they need to send different actions/flags, they can just add as
> many new strings as they like on top of the event. :)

Fair enough.

regards
Stefan Schmidt

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