linux-kernel - Re: toshiba_acpi.c: Full TOS1900 device support

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Date:	Wed, 27 Oct 2010 20:29:13 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Azael Avalos <coproscefalo@...il.com>
Cc:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: toshiba_acpi.c: Full TOS1900 device support

On Wed, Oct 27, 2010 at 01:24:15PM -0600, Azael Avalos wrote:
> Yes, actually the ACPI video driver does a better job of detecting the
> video device,
> so perhaps something like the following would be better IMHO for at least the
> backlight:

Yeah, that looks better.

> Is there an ACPI function that let's us query the display brightness?
> Because TOS1900 devices lack the HCI method to query the LCD status,
> and thus the proc interface will be useless, that is, if a userland (or any
> other) application is using it.

Ignore the proc interface. Everyone should be using sysfs now. _BQC is 
the standardised ACPI function for this, but it's not always 
implemented.

> > Ugh. Use i8042_install_filter instead, and just look at the raw i8042
> > stream. That'll avoid the ugly strncmp for the device names in order to
> > find the right device.
> >
> 
> Can you point me to some documents (if any) or even pieces of code
> that I can look at.
> 
> I've tried using the i8042_install_filter function, but I haven't had
> any luck so far,
> or perhaps I'm using it in wrong, due to my limited kernel knowledge.

Take a look at the dell-laptop driver in drivers/platform/x86.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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