[ltp] getting hdaps up and running on the w530
Mon, 14 Apr 2014 08:09:20 +0200
On Mon, Apr 14, 2014 at 02:48:27PM +0900, Raider Sail wrote:
> I'm interested in getting the HDAPS module up and running on the W530.
> I need help getting started. Here's what I've learned so far. Please
> post what you know in response, or point me to better information.
> Peter Zhang at Lenovo has graciously agreed to forward technical
> requests to the Lenovo developers. I would like help. Someone more
> experienced with the code could contact him instead of me, of course.
I asked for hdaps docs in Message-ID:
<20140221095309.GA1347@dorei.kerker.die-welt.net> and Peter answered
they are working on drivers. Didn't hear anything more yet.
> I'm on Fedora 20, kernel 3.13.9-200.fc20.x86_64. For the latest (?)
> hdaps I'm using https://github.com/evgeni/tp_smapi.git.
> Issues I see:
> This kernel has a working thinkpad-acpi module but not thinkpad-ec.
> The hdaps module from tp_smapi 0.41. depends on thinkpad-ec.The APS
> hardware may have changed.hdapsd may require updates including /sys
> interface changes and systemd integration, but also including the
> protocol used if #2 is significant.
tp-acpi and tp-smapi have nothing (!) in common. tp-acpi allows the use
of IBM/Lenovo specific ACPI calls on ThinkPads, whereas tp-smapi allows
the use of the embedded-controller directly.
>From what I know, Lenovo has changed the EC in the *20ies Thinkpads and
then in the *30ies again. From a quick poking around, there is no
(accessible the old way) EC in the *30ies anymore. So tp-smapi has no
way for working there.
> On (1) I'm not certain what is necessary or best: fix thinkpad-ec or
> simply refit hdaps to use features added to thinkpad-acpi?
We have a hdaps in-kernel, so the best solution would be getting docs
for the device and integrating support into the existing hdaps module.
Then we can probably let tp-smapi to rest, finally.
> On (2) the W530 accelerometer appears to act the same way, producing
> X/Y/status output, using the Windows demo C# code that used to be
> available via B. Suter's Stanford page (and loads sensor.dll). See
Interesting. sensor.dll is something Lenovo-ish I guess?
> Before asking I think we should have a strategy in mind for updating the code.
> Loading hdaps.ko from tp-smapi 0.41 requires thinkpad_ec.ko to be
> loaded since that provides the read/write mechanism. I see the
> following error when insmod'ing thinkpad_ec.ko 0.41 on :
> [153711.751399] thinkpad_ec: thinkpad_ec_request_row: arg0 rejected: (0x01:0x00)->0x00 [153711.751403] thinkpad_ec: thinkpad_ec_read_row: failed requesting row: (0x01:0x00)->0xfffffffb [153711.751405] thinkpad_ec: initial ec test failed
Yepp, no controller, no reads. Easy :)
> The native kernel's hdaps.ko (although not recommended by the current tp-smapi maintainers) doesn't load. Its error:
> [154183.223065] hdaps: supported laptop not found! [154183.223069] hdaps: driver init failed (ret=-19)!
It's not recommended because it lacks both features (event interface)
and hardware support (newer models). I'd love to get both into the
kernel and deprecate the tp-smapi version.
> There is a tecnique for learning the ports and values read/written
> using Windows Debugger, as Mark A. Smith did as described in
> This seems harder than asking Lenovo engineering for a small amount of technical assistance.
I'd prefer pure docs here ;)
> On (3) I assume the hdapsd available in Fedora 20 is from
> http://sourceforge.net/projects/hdaps/files/hdapsd/$ sudo hdapsd
> -Vhdapsd 20090401
> $ sudo hdapsd -d sdaMon Apr 14 14:34:07 2014: Starting hdapsdMon Apr 14 14:34:07 2014: Could not find a suitable interface
> The missing ACPI interface files appear to be:
> /sys/devices/platform/hdaps/position and or
> /sys/module/hdaps_ec/initstate but there are several failed open(2)
> system calls in strace(1) output.
hdapsd should be fine here, as soon we can read the device, hdapsd will
hapilly park your drive.
> If someone else with more experience wants to work on this with me,
> that would be good. I can dedicate my W530 to testing.
Have access to enough new-style thinkpads, but refuse to reverse
engeneer stuff. Docs docs docs please :)
Evgeni, with his hdapsd and tp-smapi maintainer hats on.
Bruce Schneier can read and understand Perl programs.