[Gta04-owner] switching usb modes

[Kevin Hremeviuc]

On Thu, 2012-07-26 at 17:10 +1000, NeilBrown wrote:
> On Wed, 25 Jul 2012 22:57:37 -0700 (PDT) Kevin Hremeviuc
> <khremeviuc at yahoo.com> wrote:
> 
> > Hi all,
> > 
> > Thanks Neil. I thought that the switching was manual as per the gta02. Also the gta02 had a powered host mode. Is there is an equivalent on the gta04?
> > 
> >
> 
> I don't know if it is switchable via software.
> 
> I didn't think gta02 did have a powered now.
> 
> gta04 does.  When you plug in the otg cable it will supply 5V at 100mA, which
> is just enough for a USB stick, though some claim to require 200mA, so the
> kernel refused to talk the them.
> 
> lsusb -v
> 
> will list details of what is plugged in, including "MaxPower" which is what
> it wants.  If you plug your device into some computer, run "lsusb" and find
> the MaxPower is more than 100mA, the GTA04 will refuse to power it.

I have tried plugging in a powered USB hub and it just isn't detected -
there is no output from dmesg.
What I did with the gta02 was use a powered hub and then plug multiple
devices into that eg. USB master midi keyboard and an Akai MPD24. I
can't get anything to work on the gta04.

> 
> NeilBrown