netdev - Re: [RFC PATCH 4/6] net: wwan: add NMEA port support

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Message-Id: <4D47E70F-D3F3-4EB6-8AE0-D50452865E58@unrealasia.net>
Date: Mon, 28 Apr 2025 21:23:53 +0800
From: Muhammad Nuzaihan Kamal Luddin <zaihan@...ealasia.net>
To: Slark Xiao <slark_xiao@....com>
Cc: Sergey Ryazanov <ryazanov.s.a@...il.com>,
 Loic Poulain <loic.poulain@....qualcomm.com>,
 Johannes Berg <johannes@...solutions.net>,
 Andrew Lunn <andrew+netdev@...n.ch>, Eric Dumazet <edumazet@...gle.com>,
 David S Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Abeni Paolo <pabeni@...hat.com>, netdev@...r.kernel.org,
 Qiang Yu <quic_qianyu@...cinc.com>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Johan Hovold <johan@...nel.org>
Subject: Re: [RFC PATCH 4/6] net: wwan: add NMEA port support

Hi Slark,

you cab add udev rules to set the permissions.

Regards,
Zaihan
Sent from my iPhone

> On 28 Apr 2025, at 4:28 PM, Slark Xiao <slark_xiao@....com> wrote:
> 
> 
> At 2025-04-09 18:42:59, "Sergey Ryazanov" <ryazanov.s.a@...il.com> wrote:
>>> On April 9, 2025 11:30:58 AM GMT+03:00, Slark Xiao <slark_xiao@....com> wrote:
>>> 
>>> Hi Sergey,
>>> Device port /dev/gnss0 is enumerated . Does it be expected?
>>> I can get the NMEA data from this port by cat or minicom command.
>>> But the gpsd.service also can not be initialized normally. It reports:
>>> 
>>> TriggeredBy: ● gpsd.socket
>>>   Process: 3824 ExecStartPre=/bin/stty speed 115200 -F $DEVICES (code=exited, status=1/FAILURE)
>>>       CPU: 7ms
>>> 
>>> 4月 09 16:04:16 jbd systemd[1]: Starting GPS (Global Positioning System) Daemon...
>>> 4月 09 16:04:17 jbd stty[3824]: /bin/stty: /dev/gnss0: Inappropriate ioctl for device
>>> 4月 09 16:04:17 jbd systemd[1]: gpsd.service: Control process exited, code=exited, status=1/FAILURE
>>> 4月 09 16:04:17 jbd systemd[1]: gpsd.service: Failed with result 'exit-code'.
>>> 4月 09 16:04:17 jbd systemd[1]: Failed to start GPS (Global Positioning System) Daemon.
>>> 
>>> Seems it's not a serial port.
>> 
>> It is a char dev lacking some IOCTLs support. Yeah.
>> 
>>> Any advice?
>> 
>> Yep. Remove that stty invocation from the service definition. For me, gpsd works flawlessly. You can try to start it manually from a terminal.
>> 
>> --
>> Sergey
> Hi Sergey,
> My device could output the NMEA data by port /dev/gnss0. Something like below:
> 
> $GPRMC,071634.00,A,2239.372067,N,11402.653048,E,,,280425,,,A,V*2D
> $GARMC,071634.00,A,2239.372067,N,11402.653048,E,,,280425,,,A,V*3C
> $GBRMC,071634.00,A,2239.372067,N,11402.653048,E,,,280425,,,A,V*3F
> $GNRMC,071634.00,A,2239.372067,N,11402.653048,E,,,280425,,,A,V*33
> $GNGNS,071634.00,2239.372067,N,11402.653048,E,NAANNN,02,500.0,,,,,V*15
> $GPGGA,071634.00,2239.372067,N,11402.653048,E,1,00,500.0,,,,,,*59
> $GAGGA,071634.00,2239.372067,N,11402.653048,E,1,01,500.0,,,,,,*49
> $GBGGA,071634.00,2239.372067,N,11402.653048,E,1,00,500.0,,,,,,*4B
> $GNGGA,071634.00,2239.372067,N,11402.653048,E,1,02,500.0,,,,,,*45
> $GPGSV,4,1,13,04,00,038,,05,33,240,,06,41,033,,09,25,058,,1*6F
> $GPGSV,4,2,13,11,47,344,,12,33,286,,13,09,185,,17,29,128,,1*6E
> $GPGSV,4,3,13,19,54,113,,20,62,284,,22,15,174,,25,09,311,,1*68
> $GPGSV,4,4,13,40,00,000,28,1*58
> $GLGSV,3,1,09,10,19,245,,06,38,185,,09,06,203,,11,13,296,,1*79
> $GLGSV,3,2,09,05,60,064,,20,39,013,,19,17,084,,21,15,321,,1*7E
> $GLGSV,3,3,09,04,16,030,,1*41
> $GAGSV,3,1,11,02,30,297,,04,32,076,,05,10,188,,06,41,107,,7*78
> $GAGSV,3,2,11,09,39,140,,10,26,055,,11,42,027,,12,09,071,,7*7E
> $GAGSV,3,3,11,16,36,198,,24,19,176,,36,39,317,,7*45
> $GBGSV,4,1,15,01,47,122,,02,46,234,,03,63,189,,04,34,108,,1*7D
> $GBGSV,4,2,15,05,23,253,,06,04,187,,07,86,194,,08,68,284,,1*75
> $GBGSV,4,3,15,09,03,201,,10,78,299,,11,56,025,,12,29,094,,1*71
> 
> But the gpsd progress were stuck with below errors:
> ● gpsd.service - GPS (Global Positioning System) Daemon
>     Loaded: loaded (/lib/systemd/system/gpsd.service; enabled; vendor preset: enabled)
>     Active: active (running) since Mon 2025-04-28 23:16:47 CST; 20s ago
> TriggeredBy: ● gpsd.socket
>    Process: 5281 ExecStart=/usr/sbin/gpsd $GPSD_OPTIONS $OPTIONS $DEVICES (code=exited, status=0/SUCCESS)
>   Main PID: 5283 (gpsd)
>      Tasks: 1 (limit: 37272)
>     Memory: 652.0K
>        CPU: 10ms
>     CGroup: /system.slice/gpsd.service
>             └─5283 /usr/sbin/gpsd -F /var/run/gpsd.sock /dev/gnss0
> 
> 4月 28 23:16:47 jbd systemd[1]: Starting GPS (Global Positioning System) Daemon...
> 4月 28 23:16:47 jbd systemd[1]: Started GPS (Global Positioning System) Daemon.
> 4月 28 23:17:02 jbd gpsd[5283]: gpsd:ERROR: SER: device open of /dev/gnss0 failed: Permission denied - retrying read-only
> 4月 28 23:17:02 jbd gpsd[5283]: gpsd:ERROR: SER: read-only device open of /dev/gnss0 failed: Permission denied
> 4月 28 23:17:02 jbd gpsd[5283]: gpsd:ERROR: /dev/gnss0: device activation failed, freeing device.
> 
> And I checked the gnss device attribute, it reports:
> crw------- 1 root root 237, 0  4月 28  2025 /dev/gnss0
> 
> May I know how do you fix this?
> 
> Thanks
> 
>