[MeeGo-dev] [Moblin Dev] USB stack - On the Go support

[Kees Jongenburger]

On Thu, Feb 25, 2010 at 5:07 PM, Greg KH <gregkh at suse.de> wrote:
> On Thu, Feb 25, 2010 at 09:29:33PM +0530, Sriram Chadalavada wrote:
>> The reason I ask about Linux USB OTG support is that it appears to be
>> somewhat leading edge.
>
> Why do you say that?  Linux has had OTG support for _many_ years, and is
> shipped in many devices.  Actually most OTG devices you see in the
> market are running Linux inside of them.

I learned that most people when talking about OTG are actually talking
about the ability for a device to act in either host or function mode.
They don't care about the specs
or special cables needed. I think the only kernel to support such
feature without to much hassle is the omap kernel (using the
tranciever API see
http://www.linux-usb.org/gadget/h2-otg.html ).  For portable device
depending on the size I think it is only fair to have booth host and
function mode. If the device is large
a host and device port can be placed and for smaller devices like the
N800 for example it's only fair to allow switching and while in
usb-host mode provide at least 100ma.

>
> The problem is, OTG itself really isn't a good idea, and is difficult to
> handle on both the host and device side for a variety of reasons.  I
> would recommend not doing it if at all possible and just stick to a
> "normal" type device interface instead.

So what would normal be on something like the  N900 or the EEE? I
consider emptying a camera to the N900 is a real life senario ,to bad
it doesn't support usb-host.

Greetings