linux-kernel - Re: Cleaning asus

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Date:	Tue, 4 Aug 2009 13:35:49 -0700
From:	Greg KH <greg@...ah.com>
To:	Corentin Chary <corentin.chary@...il.com>
Cc:	Jakub Schmidtke <sjakub@...il.com>,
	acpi4asus-user@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Cleaning asus_oled

On Tue, Aug 04, 2009 at 08:40:10PM +0200, Corentin Chary wrote:
> Hi,
> I'm trying to clean the asus_oled driver, here is my git tree with
> some trivial patchs.
> http://git.iksaif.net/?p=acpi4asus.git;a=shortlog;h=refs/heads/asus_oled

That's great!  But note, I need patches in email form, so you are going
to use git format-patch to dig them out for me, right?  :)

> Before working deeper, I wanted to discuss about the userspace interface:
> 
> > TODO:
> > [...]
> >        - audit the userspace interface
> >                - sysfs vs. char?
> 
> First, should we move asus_oled functionalities in asus-laptop ?
> Then the interface would be in sysfs under
> /sys/devices/platform/asus-laptop/{picture|enable} ?

Is that the way that other drivers of this kind of functionality work
today?  If so, yes, that would be good.

> Else we can use /dev/asus_oled, with an ioctl (or a zero-size image)
> to switch the OLED off.
> But I don't think /sys/class/oled is a good place to be, because
> /sys/class is for generic things.

Like /sys/class/video_output?  There's got to be some other generic
backlight driver class already, oh, hey, look at /sys/class/backlight!

So, why not just use the backlight interface instead, that way you don't
have to write custom userspace code for this specific platform?

thanks,

greg k-h
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