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kplex: add support for Sierra Wireless Gobi GPS 

Sierra Wireless modems need the string '$GPS_START' to be sent to the
GPS tty device as only then the modem firmware starts emitting
NMEA-0183 sentences.
Add an option 'sierragpsstart' to kplex' serial driver to support that
quirk as kplex can be very useful to spread GPS data over the network
while also supplying 'ugps' using a PTY, allowing for correct system
time to be set automatically on boot up from GPS.

This patch is also PR'ed at the upstream project:
https://github.com/stripydog/kplex/pull/54

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2021-05-28 23:21:15 +02:00
parent 2e02d899ae
commit 8790d3a1fe
2 changed files with 66 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/kplex/Makefile
View File

@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=kplex
PKG_VERSION:=1.4
PKG_RELEASE=2
PKG_RELEASE=3
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tgz
PKG_SOURCE_URL:=http://www.stripydog.com/download

65
net/kplex/patches/100-add-support-for-Sierra-Wireless-qcserial-NMEA-0183-i.patch Normal file
View File

@ -0,0 +1,65 @@
From a3dec2cbe5e539b5a270bed86eed78b283c79cdb Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Thu, 27 May 2021 01:18:20 +0200
Subject: [PATCH] add support for Sierra Wireless qcserial NMEA-0183 interface
Sierra Wireless EM 74xx modems come with a serial port outputting
NMEA-0183 GPS sentences. In order to make it work, the magic string
'$GPS_START' needs to be written to the modem, as only then the modem
firmware starts sending NMEA-0183 output.
Add option 'sierragpsstart' which if set to anything else than 0 will
make kplex send the magic string when the device is opened.
---
serial.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
--- a/serial.c
+++ b/serial.c
@@ -24,6 +24,7 @@
#include <pwd.h>
#define DEFSERIALQSIZE 32
+#define SIERRA_GPS_START "$GPS_START\n"
struct if_serial {
int fd;
@@ -290,7 +291,8 @@ struct iface *init_serial (struct iface
int ret;
struct kopts *opt;
int qsize=DEFSERIALQSIZE;
-
+ int send_gps_start = 0;
+
for(opt=ifa->options;opt;opt=opt->next) {
if (!strcasecmp(opt->var,"filename"))
devname=opt->val;
@@ -324,7 +326,9 @@ struct iface *init_serial (struct iface
logerr(0,"Invalid queue size specified: %s",opt->val);
return(NULL);
}
- } else {
+ } else if (!strcasecmp(opt->var, "sierragpsstart")) {
+ send_gps_start=atoi(opt->val);
+ } else {
logerr(0,"unknown interface option %s",opt->var);
return(NULL);
}
@@ -337,7 +341,7 @@ struct iface *init_serial (struct iface
}
/* Open interface or die */
- if ((ifs->fd=ttyopen(devname,ifa->direction)) < 0) {
+ if ((ifs->fd=ttyopen(devname, send_gps_start?BOTH:ifa->direction)) < 0) {
return(NULL);
}
DEBUG(3,"%s: opened serial device %s for %s",ifa->name,devname,
@@ -358,6 +362,9 @@ struct iface *init_serial (struct iface
ifs->saved=1;
ifs->slavename=NULL;
+ if (send_gps_start)
+ write(ifs->fd, SIERRA_GPS_START, strlen(SIERRA_GPS_START));
+
/* Assign pointers to read, write and cleanup routines */
ifa->read=do_read;
ifa->readbuf=read_serial;