On 02/11/2018 08:52 AM, Jun Sun wrote:
Thanks for your reply, Krzysztof. I now understand all the fields.
However, I just realize I can't really extend your example to cover my
need, because your example uses RNDIS where kernel already support OS
descriptor.
In my case I'm preparing my own functionfs-based gadget. I suppose
somewhere inside my functionfs daemon, I should add OS descriptor
support. Is that understanding right? If so, is there any example?
I searched around internet and can't seem to find a single example
where functionfs-based USB gadget supports OS descriptor. In fact, it
is not even clear to me what kernel interfaces are used for conveying
OS descriptor for functionfs-based function.
Thanks again. Really appreciate your help.
I don't have any good example for that but this should be simple.
It's only adding an additional flag to you descriptors (FFS_HAS_OS_DESC
or sth similar, check ffs header for this) and then adding your os_desc
to your descriptors.
Best regards,
--
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics
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