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

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Message-ID: <7aed94ce.2dca.1967b8257af.Coremail.slark_xiao@163.com>
Date: Mon, 28 Apr 2025 16:27:41 +0800 (CST)
From: "Slark Xiao" <slark_xiao@....com>
To: "Sergey Ryazanov" <ryazanov.s.a@...il.com>
Cc: "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>,
	"Paolo Abeni" <pabeni@...hat.com>, netdev@...r.kernel.org,
	"Muhammad Nuzaihan" <zaihan@...ealasia.net>,
	"Qiang Yu" <quic_qianyu@...cinc.com>,
	"Manivannan Sadhasivam" <manivannan.sadhasivam@...aro.org>,
	"Johan Hovold" <johan@...nel.org>
Subject: Re:Re:Re:[RFC PATCH 4/6] net: wwan: add NMEA port support


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