linux-kernel - Re: Provide /sys/../ec with read/write access and some cleanups

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Date:	Thu, 1 Jul 2010 21:44:26 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	lenb@...nel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
	astarikovskiy@...e.de
Subject: Re: Provide /sys/../ec with read/write access and some cleanups

On Thursday 01 July 2010 06:22:39 pm Henrique de Moraes Holschuh wrote:
> On Thu, 01 Jul 2010, Thomas Renninger wrote:
> > These patches are diffed against the test branch of the ACPI tree, but
> > also patch fine with 2.6.35-rc3.
> >
> > I thought about tainting the kernel if someone writes to the EC, but as
> > userspace can also write to graphics IO, PCI config or MSRs, it shouldn't
> > matter that much.
> > Eventually this should still be added (by a separate patch), one can
> > easily confuse the EC to not switch on the fans anymore.
> >
> > A small tool to read out and write to /sys/devices/system/ec/*/io can be
> > found here:
> > ftp://ftp.suse.com/pub/people/trenn/sources/ec/ec_access.c
> >
> > Len: Can you apply these into your test branch and schedule them for
> > linux-next and 2.6.36 if there are no objections, please.
>
> I am just wondering if we shouldn't have this in debugfs instead of regular
> /sys.  Do you envision *production* use of this facility, or should it just
> be something to use for debugging and hacking?
Only for debugging and hacking. Apps must not use it for production.
On the one hand I agree, on the other hand side  I think the EC somehow
fits into /sys/devices/system/ec. I don't have a strong opion on that, though.

      Thomas
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