USB gadget mode in laptop

[Dave Hylands]

On Thu, Aug 4, 2016 at 10:54 AM, Susanoo Tux <susanootux at gmail.com> wrote:

>
>
> On Thu, Aug 4, 2016 at 11:18 PM, Dave Hylands <dhylands at gmail.com> wrote:
>
>>
>> On Thu, Aug 4, 2016 at 10:45 AM, Susanoo Tux <susanootux at gmail.com>
>> wrote:
>>
>>>
>>>
>>> On Thu, Aug 4, 2016 at 10:38 PM, Dave Hylands <dhylands at gmail.com>
>>> wrote:
>>>
>>>>
>>>> ...snip...
>>
>>> Checkout Documentation/usb (in your kernel source tree). You'll find a
>>>> bunch of files starting with the word gadget which describe the various
>>>> gadget drivers and how to use them.
>>>>
>>> ...snip...
>>
>>>
>>> Thanks for the reference, I gone through the configfs. And tried
>>> creating it, but
>>> it's not working. I am using x86, is that configfs method configures the
>>> usb
>>> controllers to behave a device ? because nothing is there
>>> in /sys/class/udc/.
>>>
>>
>> Yes - it requires that the USB controller be able to behave as a device.
>> I've only used this on SoC's that had that capability (like gumstix or
>> BeagleBone) and not on a desktop.
>>
>> --
>> Dave Hylands
>> Shuswap, BC, Canada
>> http://www.davehylands.com
>>
>
> Yes, I can see the error in dmesg "couldn't find an available UDC - added
> [g1] to list of pending drivers" :(.
>
> But I didn't get the meaning of this. May be one basic question, how to
> check whether my desktop supports device/gadget mode?
>

It's been a while since I worked on this stuff, but I seem to recall that
you need a USB device that supports OTG (On-The-Go). I believe that you can
get PCI cards that support USB OTG. I suspect the USB hosts builtin to most
x86 motherboards don't support it. But that's the feature you need to look
for.

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com
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