linux-kernel - Re: GNSS support for Qualcomm PCIe modem device

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Message-ID: <CAFEp6-2_+25Z+2nPOQtOzJPgfJM8DAs2h_e6HTQ4fAVLt0+bwQ@mail.gmail.com>
Date: Tue, 8 Apr 2025 11:13:17 +0200
From: Loic Poulain <loic.poulain@....qualcomm.com>
To: Muhammad Nuzaihan <zaihan@...ealasia.net>
Cc: Sergey Ryazanov <ryazanov.s.a@...il.com>, Slark Xiao <slark_xiao@....com>,
        Loic Poulain <loic.poulain@...aro.org>,
        manivannan.sadhasivam@...aro.org, netdev@...r.kernel.org,
        Qiang Yu <quic_qianyu@...cinc.com>, johan@...nel.org,
        mhi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: GNSS support for Qualcomm PCIe modem device

Hi Zhaihan, Sergey.

On Fri, Apr 4, 2025 at 7:42 AM Muhammad Nuzaihan <zaihan@...ealasia.net> wrote:
>
> Hi Sergey, Slark,
>
> Using wwan subsystem and it works without issues, maybe i might miss
> something, perhaps the flow control but i never have any problems even
> without flow control.
>
> I am using gpsd + cgps and xgps with a small modification to Linux
> kernel's wwan subsystem in the kernel to get NMEA data.
>
> I had posted the patch previously and i can post the patch again if you like.
>
> Attached in this email is the screenshot of cgps + gpsd.
>
> Maybe it should be in GPS subsystem but it's working for me even using
> wwan subsystem for months now.

Yes, I would strongly recommend doing the extra step of making it
registered to the GNSS subsystem so that device is exposed with the
correct class.
>From WWAN driver perspective, it will not change anything, as we could
have the WWAN framework handling this properly (bridging to gnss
intead of exposing the port as wwan character device).
Sergey, is it your plan?

Regards,
Loic