Re: composite gadget with _real_ USB device

[Shea Ako]

> How about setting up USBIP, using the same machine as both the server
> and the client?

That’s an interesting idea, I’ll check it out. Thanks for the tip!

And thanks Felipe for your input too, I really appreciate the help.


> On May 20, 2016, at 9:38 AM, Alan Stern  wrote:
> 
> On Fri, 20 May 2016, Felipe Balbi wrote:
> 
>> 
>> Hi,
>> 
>> Shea Ako  writes:
>>> I’ve been learning about and playing with configfs and functionfs to
>>> create composite user space USB gadgets. My objective is to create a
>>> composite USB gadget that incorporates a custom functionfs function of
>>> my own creation along with some _real_ USB devices connected to my
>>> linux platform.
>>> 
>>> Is there an easy existing way to bundle _real_ USB devices into a
>>> composite gadget like this or am I looking at writing my own user
>>> space functionfs functions which handle wrapping and forwarding the
>>> interfaces/endpoints/data of the connected _real_ USB devices?
>> 
>> heh, you're really on your own. Sounds pretty interesting but you're
>> gonna spend a lot of time with this :p
>> 
>>> I haven’t found any documented existing way to do this, but I thought
>>> I should ask before I go off an implement it myself as it seems that
>>> this might be a use case which isn’t entirely off the wall and there
>>> could already be support for this somewhere that I haven’t yet
>>> encountered.
>> 
>> I don't think anybody has done anything like this yet. The closest I got
>> was to attach some USB sticks to host port via HUB, setup RAID and use
>> that RAID as backing store for g_mass_storage, then connect
>> g_mass_storage back to same host which has the RAID of several USB
>> sticks (same machine has host and peripheral controllers).
> 
> How about setting up USBIP, using the same machine as both the server
> and the client?
> 
> Alan Stern
> 

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Re: composite gadget with _real_ USB device

[Felipe Balbi]

Hi,

Shea Ako  writes:
> I’ve been learning about and playing with configfs and functionfs to
> create composite user space USB gadgets. My objective is to create a
> composite USB gadget that incorporates a custom functionfs function of
> my own creation along with some _real_ USB devices connected to my
> linux platform.
>
> Is there an easy existing way to bundle _real_ USB devices into a
> composite gadget like this or am I looking at writing my own user
> space functionfs functions which handle wrapping and forwarding the
> interfaces/endpoints/data of the connected _real_ USB devices?

heh, you're really on your own. Sounds pretty interesting but you're
gonna spend a lot of time with this :p

> I haven’t found any documented existing way to do this, but I thought
> I should ask before I go off an implement it myself as it seems that
> this might be a use case which isn’t entirely off the wall and there
> could already be support for this somewhere that I haven’t yet
> encountered.

I don't think anybody has done anything like this yet. The closest I got
was to attach some USB sticks to host port via HUB, setup RAID and use
that RAID as backing store for g_mass_storage, then connect
g_mass_storage back to same host which has the RAID of several USB
sticks (same machine has host and peripheral controllers).

-- 
balbi


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composite gadget with _real_ USB device

[Shea Ako]

Hello,

I’ve been learning about and playing with configfs and functionfs to create 
composite user space USB gadgets. My objective is to create a composite USB 
gadget that incorporates a custom functionfs function of my own creation along 
with some _real_ USB devices connected to my linux platform.

Is there an easy existing way to bundle _real_ USB devices into a composite 
gadget like this or am I looking at writing my own user space functionfs 
functions which handle wrapping and forwarding the interfaces/endpoints/data of 
the connected _real_ USB devices?

I haven’t found any documented existing way to do this, but I thought I should 
ask before I go off an implement it myself as it seems that this might be a use 
case which isn’t entirely off the wall and there could already be support for 
this somewhere that I haven’t yet encountered.

TIA,
Shea--
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