Re: Looking for some pointers on WMI/EC access

[Florian Echtler <floe@butterbrot.org>]

Am Sonntag, den 18.04.2010, 21:21 +0200 schrieb Corentin Chary:
> On Sat, Apr 17, 2010 at 5:37 PM, Florian Echtler <floe@butterbrot.org> wrote:
> > I've just bought an Ideapad S10-3t, and most features including ACPI
> > work fine. However, since neither thinkpad-acpi nor lenovo-sl-laptop
> > support this device, I've been looking around for some hints on how to
> > access the embedded controller in order to get the hotkeys working. I'll
> > post what I've found so far and hope that somebody could give me some
> > hints as to how to proceed.
> > First, I've dumped the DSDT and browsed through it. I've found a _WDT
> > section, and wmidump shows:
> Wow, someone actually used that tool ^^
> A Quick hint would be to look at
> https://patchwork.kernel.org/patch/87210/ which is basically a really
> short example of what a wmi-driver is.
> Just change the guid, buid/load, push some hotkeys, see dmesg, edit
> the keymap, build, load, test ..
Thanks for the pointer - I've given it a quick try and the driver loads
successfully, however, the event doesn't seem to be triggered. I've put
a printk into the eeepc_wmi_notify function, and this is seemingly never
called.. although I believe this may be the right direction, as the GUID
from the eeepc driver (ABBC0F72-8EA1-11D1-00A0-C90629100000) and the one
from my Lenovo (ABBC0F20-8EA1-11D1-00A0-C90629100000) differ only by a
single byte. Could this event be disabled somehow? 

> > ABBC0F20-8EA1-11D1-00A0-C90629100000:
> >        object_id: �
> >        notify_id: 80
> >        reserved: 00
> >        instance_count: 1
> >        flags: 0x8 ACPI_WMI_EVENT
> > ABBC0F40-8EA1-11D1-00A0-C90629100000:
> >        object_id: IO
> >        notify_id: 49
> >        reserved: 4F
> >        instance_count: 1
> >        flags: 0x1 ACPI_WMI_EXPENSIVE
> > 05901221-D566-11D1-B2F0-00A0C9062910:
> >        object_id: AE
> >        notify_id: 41
> >        reserved: 45
> >        instance_count: 1
> >        flags: 0
Corresponding to the 2nd GUID, there's also a WQIO method in my DSDT
which should return a data block, correct?

> > As this laptop also runs some kind of Splashtop instant-on Linux called
> > Lenovo Quickstart, I've decided to extract the initrd from its kernel
> > (*) and browse through the modules. Interestingly, I've found a
> > lenovo_ec.ko: strings shows that it accesses some DSDT elements which
> > are present on the S10-3t. Would it make sense to disassemble this?
> You can also try to see if the manufacturer give some sources or ask them to ...
I've done that, let's see if I will get some response.

Florian
-- 
0666 - Filemode of the Beast

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