Date: Tue, 31 May 2005 19:35:47 +0200 From: Markus Brueffer <markus@FreeBSD.org> To: freebsd-acpi@freebsd.org Cc: freebsd-mobile@FreeBSD.org Subject: Re: Call for testers: New acpi_ibm driver Message-ID: <200505311935.57158.markus@FreeBSD.org> In-Reply-To: <429C9DB9.4070107@root.org> References: <200505310155.KAA00994@axe-inc.co.jp> <200505311225.40954.markus@FreeBSD.org> <429C9DB9.4070107@root.org>
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On Tuesday 31 May 2005 19:24, Nate Lawson wrote:
> Markus Brueffer wrote:
> > On Tuesday 31 May 2005 03:55, takawata@jp.freebsd.org wrote:
> >>In message <200505301857.20346.markus@FreeBSD.org>, Markus Brueffer=20
wrote:
[...]
> >>>Support for more hotkeys by the hotkey sysctl (see manpage)
> >>>Improved support of ACPI events, disabled by default. You can enable
> >>> it by setting the events sysctl to 1 (on my T41p there are now 24
> >>> different keypress events that get reported)
> >>>write support for: volume, mute, brightness and thinklight
> >>
> >>Is it ok to touch EC? I know the two way of impliment it.
> >>One is modifying RTC register, another is using SMI interface
> >>via ACPI control method.
> >
> > Writing to the EC directly is nothing more that accessing the locations
> > via acpi_SetInteger. While I would highly prefer the latter method, the
> > problem is, that several places of the EC in the DSDT aren't even named
> > or only named on some models.
>
> Please do not read/write directly from EC space. A better way is to use
> the EC device methods I added recently. This uses proper locking for
> requests and will work concurrently with other EC users (say, cmbat):
>
> device_t dev;
>
> dev =3D devclass_get_device(devclass_find("acpi_ec"), 0);
> if (dev =3D=3D NULL)
> error, EC not present -- check this during probe and fail
> if error
>
> error =3D ACPI_EC_WRITE(dev, address, buffer, len);
>
> or ACPI_EC_READ(). "address" is from 0-255 (8 bit addresses in EC
> space) and buffer is a pointer to data to write or read.
That's what I meant by "directly". The driver uses exactly that way.
Markus
=2D-=20
Markus Brueffer =A0 =A0| GPG-Key: http://people.FreeBSD.org/~markus/markus.=
asc
markus@brueffer.de | FP: 3F9B EBE8 F290 E5CC 1447 8760 D48D 1072 78F8 A8D4
markus@FreeBSD.org | FreeBSD: The Power to Serve!
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