linux-kernel - Re: [PATCH 3/3] Drop platform sysfs support

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Date:	Tue, 18 Aug 2009 14:45:34 -0700
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
Cc:	Mario Limonciello <mario_limonciello@...l.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	cezary.jackiewicz@...il.com
Subject: Re: [PATCH 3/3] Drop platform sysfs support

Hi Alan,

> >> In practice I suspect it makes no difference that the rfkill and
> >> backlight devices are exported as virtual devices with no physical
> >> parent.  I just don't think it's "right" :-).
> >
> > it actually does make a difference for hardware detection. We wanna have
> > them hanging of the compal platform device.
> 
> Ok.  I wasn't sure that userspace was allowed to rely on that, but I
> re-read Documentation/ABI/testing/sysfs-devices and I see now that it
> can be allowed.
> 
> Some of these issues with the compal-laptop work may come from copying
> dell-laptop.  dell-laptop is the only driver which creates rfkill
> devices without a parent device.  In fact, it doesn't even create a
> platform device :-).

then that should be fixed. All RFKILL switches should really have a
parent and not dangling around the virtual tree. Especially since they
have physical hardware in the system.

> I'll try sending a patch or two to clean up dell-laptop.  I don't have
> the hardware but it should be pretty mechanical, almost a copy+paste
> job from a "good" driver.

That would be good. I don't have the hardware either, but others here
can test it.

Regards

Marcel


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