linux-kernel - Re: [External] Re: [PATCH v5 0/8] Add MA USB Host driver

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Message-ID: <b14a2f71-3931-8d32-43a1-cbf52add48bb@displaylink.com>
Date:   Thu, 30 Apr 2020 18:51:10 +0200
From:   Vladimir Stankovic <vladimir.stankovic@...playlink.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        mausb-host-devel@...playlink.com
Subject: Re: [External] Re: [PATCH v5 0/8] Add MA USB Host driver

On 28.4.20. 13:04, Greg KH wrote:
> On Sat, Apr 25, 2020 at 11:19:46AM +0200, vladimir.stankovic@...playlink.com wrote:
>> Media Agnostic (MA) USB Host driver provides USB connectivity over an
>> available network, allowing host device to access remote USB devices
>> attached to one or more MA USB devices (accessible via network).
>>
>> This driver has been developed to enable the host to communicate
>> with DisplayLink products supporting MA USB protocol (MA USB device,
>> in terms of MA USB Specification).
>>
>> MA USB protocol used by MA USB Host driver has been implemented in
>> accordance with MA USB Specification Release 1.0b.
> 
> Is that a USB-released spec?
Correct, document is being maintained by USB IF and is publicly available.
However, I just noticed a typo, correct version is 1.0a. Will correct.

In short, MA USB Specification defines an MA USB protocol that performs USB
communication via any communication medium. As such, it defines how to pack
USB data within MA USB payload, and how to communicate with remote MA USB device.
> 
>>
>> This driver depends on the functions provided by DisplayLink's
>> user-space driver.
> 
> Where can that userspace code be found?
> 
> thanks,
> 
> greg k-h
> 
Userspace code is not publicly available. However, in short, it's purpose is
twofold, to provide interface to application layer, and to prepare MA USB packets
that will be used by remote device.

Related to userspace related questions (i.e. comments around two devices used),
we can provide detailed description of the used IPC. In that sense, please state
the most appropriate way/place to state/publish such description (i.e. is it ok
to add it within the cover letter, or publicly available URL is preferred). 

-- 
Regards,
Vladimir.