Re: [PATCH v9 3/4] docs: Add documentation for userspace client interface

[Hemant Kumar]

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
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project