linux-kernel - Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony

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Message-Id: <200610120028.29617.luming.yu@gmail.com>
Date:	Thu, 12 Oct 2006 00:28:29 +0800
From:	Yu Luming <luming.yu@...il.com>
To:	Matt Domsch <Matt_Domsch@...l.com>
Cc:	Richard Hughes <hughsient@...il.com>, Pavel Machek <pavel@....cz>,
	Andrew Morton <akpm@...l.org>,
	Alessandro Guido <alessandro.guido@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	len.brown@...el.com, jengelh@...ux01.gwdg.de, gelma@...ma.net,
	ismail@...dus.org.tr
Subject: Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony_acpi driver

On Wednesday 11 October 2006 00:10, Matt Domsch wrote:
> On Tue, Oct 10, 2006 at 03:47:26PM +0100, Richard Hughes wrote:
> > On Tue, 2006-10-10 at 22:32 +0800, Yu Luming wrote:
> > > >From my understanding, a cute userspace App shouldn't have this kind
> > >
> > > of logic:
> > >         if (is  DELL )
> > >                 invoke libsmbios
> > >         if (is  foo)
> > >                 invoke libfoo,
> > >         if (is bar)
> > >                 invoke libbar,
> > >         ....
> > >         else
> > >                 operate on /sys/class/backlight/ ,.,..
> >
> > This is what HAL has at the moment[1]. And it's hell to maintain, but
> > works for a lot of users.
>
> This is slightly different.  This shows that there are a number of
> slightly different kernel implementations:
>
> /proc/acpi/toshiba/lcd
> /proc/acpi/asus/brn
> /proc/acpi/pcc/brightness
> /proc/acpi/ibm/brightness
> /proc/acpi/sony/brightness
> /proc/omnibook/lcd
>
> which is indeed nasty. I'd agree all in-kernel solutions should use
> the same kernel<->user interface.  I'd also expect the kernel to have

Yes, we all seem to agree we need to throw away /proc/acpi just after we 
have solid sysfs interface for acpi.

> a generic ACPI driver that exports the _BCL and _BCM method
> implementations via that same interface, so that systems providing
> that will "just work".  drivers/acpi/video.c currently exports this
> via /proc/acpi/video/$DEVICE/brightness, which isn't the same as
> /sys/class/backlight. :-(

Yes, I'm working on acpi video driver transition , and have posted a patch to
user backlight for acpi video driver.
http://marc.theaimsgroup.com/?l=linux-acpi&m=115574087203605&w=2

>
> There's also at least one more userspace option for the sonypi using
> spiictrl.  This is where I expected libsmbios to plug in also, as a
> fallback to the ACPI _BCL/_BCM methods above.

I think spiictrl would be thrown away just after we have solid sysfs support.

Thanks,
Luming
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