Re: [Line6linux-devel] pod hd500x

[Hans P. M. <hm...@gm...>]

Thanks Andrej,
I will do that.

I also found in the ardour blog some quirk on snd-usb-audio for pod hd pro
in https://community.ardour.org/node/13646. The lsusb of the pod hd pro is
almost identical (except for the product id) from the one of the pod
hd500x.

I would try that path to, I still don't know how to apply the quirk,
apparently adding it to quirks-table.h and compiling the kernel.
I'm not sure why the whole kernel need to be compiled if only the
snd-usb-audio is the affected.
have you tried something like this?

thanks again.


On Tue, Jun 6, 2017 at 1:42 PM, Andrej Kruták <de...@an...> wrote:

> On Mon, Jun 5, 2017 at 7:16 PM, Hans Peter Möller <hm...@gm...>
> wrote:
> > The 4 EP (2 audio and 2 ctrl) match the ones from PODHD500_0 and
> PODHD500_1
> > (do you know what are the ctrl or User for??) so it appears to be simple.
>
> Not sure what you mean by "User", but the ctrl are used (well, can be
> used) to transfer stuff like effects configuration.
>
>
> >
> > Now to test if this simple edit would be enough, I assume I have to
> > uninstall the module from the kernel (line6usb comes with the kernel) and
> > then compile and follow the instructions prior it was included in the
> > kernel. Is that correct? If that's the case, what would be the best way
> to
> > uninstall the module from teh kernel?
>
> TBH, you should rather read some tutorial regarding this. This depends
> on your distribution, google for "linux module rebuild" etc.
>
>
> > I would also need to pin the kernel,
> > so no kernel update with line6usb module mess with this right?
> > thansk a lot.
> >
>
> That is the optimal solution. You can do such thing via dkms, for example.
>
> Myself, I only use the driver occasionally, so everytime I need it,
> I'll just basically do:
>
> rmmod snd_usb_podhd
> rmmod snd_usb_line6
> cd $LINUX_SRC/sound/usb/line6/ # basically you only need the one
> directory, not whole tree
> make -C /lib/modules/`uname -r`/build M=$PWD
> insmod snd-usb-line6.ko
> insmod snd-usb-podhd.ko
>
> (Of course, rmmod/insmod need to be executed as root).
>
>
> --
> Good luck,
>
> A.
>
> >
> >
> > On Sun, Jun 4, 2017 at 4:01 PM, Andrej Kruták <de...@an...> wrote:
> >>
> >> Hi there,
> >>
> >> On Thu, Jun 1, 2017 at 1:19 AM, Hans Peter Möller <hm...@gm...>
> >> wrote:
> >> >    I want to help to inlude the pod hd500x in the driver. I've never
> >> > done
> >> > some driver programming but I have done a lot of coding myself, from
> ASM
> >> > in
> >> > a PIC to php, java, javascript, vb, c, c#, etc... If you can give me
> >> > some
> >> > info to read and study it would be great to start.
> >> >
> >> > Do you use wireshark to do the reverse ingeneering stuff? I'f done
> some
> >> > basic stuff with it.
> >> >
> >> > Hope to hear from you soon.
> >> >
> >>
> >> There's not a lot of traffic here anymore, sadly - so you are veru
> >> much on your own.
> >>
> >>
> >> Anyhow, depends on what you want to do. If it's only the audio
> >> support, with a bit of luck it will be as simple as editing
> >> sound/usb/line6/podhd.c. Add LINE6_PODHD500X similarly like
> >> PODHD500_0. Check the endpoints (esp. the audio ones) match what you
> >> see in lsusb. If POD HD500X has more than 2+2 audio channels, get
> >> inspired at POD X3.
> >>
> >> If you would like to edit the presets etc., you'd have to reverse
> >> engineer the binary protocol. Basically install some USB sniffer (for
> >> me http://www.usblyzer.com/ worked fine), dump the binary stuff (from
> >> bulk endpoints) and have fun. If you cannot get any audio, you may
> >> need some control interface initialization - again check POD X3 or
> >> pod.c.
> >>
> >> I have written down steps I had to do to get POD X3 working - maybe
> >> you'll find them useful. http://andree.sk/2016/11/podx3 (there's also
> >> link to some WIP python binary protocol decoder) ... Perhaps the
> >> binary protocol is similar, in such case we could share some efforts.
> >> POD X3's is actually quite simple - but I never got the time to
> >> implement a GUI for it. Maybe if it turned out it'd be useful also for
> >> other PODs, it would be more temptin ;-)
> >>
> >> --
> >> Greetings & good luck,
> >>
> >> Andrej
> >
> >
>