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Message-ID: <a0920f91-e043-8a67-f5c4-ea06eb1ddb2a@codeaurora.org>
Date: Mon, 26 Oct 2020 15:36:45 -0700
From: Hemant Kumar <hemantk@...eaurora.org>
To: Jeffrey Hugo <jhugo@...eaurora.org>,
Dan Williams <dcbw@...hat.com>,
Jakub Kicinski <kuba@...nel.org>
Cc: manivannan.sadhasivam@...aro.org, gregkh@...uxfoundation.org,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
bbhatt@...eaurora.org, loic.poulain@...aro.org,
netdev@...r.kernel.org
Subject: Re: [PATCH v9 3/4] docs: Add documentation for userspace client
interface
On 10/26/20 6:56 AM, Jeffrey Hugo wrote:
> On 10/26/2020 7:46 AM, Dan Williams wrote:
>> On Mon, 2020-10-26 at 07:38 -0600, Jeffrey Hugo wrote:
>>> On 10/25/2020 3:46 PM, Jakub Kicinski wrote:
>>>> On Fri, 23 Oct 2020 16:17:54 -0700 Hemant Kumar wrote:
>>>>> +UCI driver enables userspace clients to communicate to external
>>>>> MHI devices
>>>>> +like modem and WLAN. UCI driver probe creates standard character
>>>>> device file
>>>>> +nodes for userspace clients to perform open, read, write, poll
>>>>> and release file
>>>>> +operations.
>>>>
>>>> What's the user space that talks to this?
>>>>
>>>
>>> Multiple.
>>>
>>> Each channel has a different purpose. There it is expected that a
>>> different userspace application would be using it.
>>>
>>> Hemant implemented the loopback channel, which is a simple channel
>>> that
>>> just sends you back anything you send it. Typically this is consumed
>>> by
>>> a test application.
>>>
>>> Diag is a typical channel to be consumed by userspace. This is
>>> consumed
>>> by various applications that talk to the remote device for
>>> diagnostic
>>> information (logs and such).
>>
>> QMI too?
>> Dan
>
> Interesting question. My product doesn't use QMI. I would expect that
> all QMI runs through Router these days, but I am seeing some QMI
> channels in the downstream source.
>
> Hemant, Do you know what is the usecase for the QMI0/QMI1 channels?
>
QMI0/QMI1 is used to send QMI message (control path) to bring the qmi
rmnet data call.
Thanks,
Hemant
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