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

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Message-ID: <9b2b86520908180623i4e7ce5cv9a4cd6b1704a0e5f@mail.gmail.com>
Date:	Tue, 18 Aug 2009 14:23:29 +0100
From:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
To:	Marcel Holtmann <marcel@...tmann.org>
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

On 8/18/09, Marcel Holtmann <marcel@...tmann.org> wrote:
> 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 :-).

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.

Thanks
Alan
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