On Wed, 8 Jun 2011, Denis Kenzior wrote:
Hi Bernhard,
From what I remember of the Telit modems, all ports are fully
functional, so the GPS port can be on any tty. If this is the case,
then the way this can be accomplished is by querying the model /
revision of the modem during the enable() stage in the modem driver and
adding the appropriate atom as needed.
The GPS port is not fully functional as far is I know it is read only.
According to the manual it is necessary to enable over the modem line
with AT$GPSP=1 afterwards it starts reporting NMEA signals on the GPS line.
In theory you can use $GPSNMUN to enable GPS reporting on Ports 1 and 4
which seem to be fully functional. However, it does look like on my
UC864-G, port #3 is used for the GPS stream. Port #1 doesn't seem to
respond to anything.
I just tried the following at my modem:
AT$GPSNMUN=1,1,1,1,1,1,1
AT$GPSP=1
Which enables the GPS reporting on Ports 1 and 4 and adds $GPSNMUN: at the
beginning of every GPS report e.g.
$GPSNMUN: $GPVTG,,T,,M,,N,,K*4E
Which would be easy to catch from ofono.
In my opinion the problem about this is that the GPS atom needs to be
loaded for every telit modem, then try AT$GPSNMUN=1,1,1,1,1,1,1 and wait
for the response. If the response is an error the atom knows that the
modem does not support GPS. Could this check/enable also be added to a
part of the telit plugin?
The udev approach has the benifet to be able to do
if (HasGPS)
... = ofono_location_reporting_create(...);
or something like that at the telit plugin.
Yes and no. ofono_modem_create has two modes of operation, one where a
known unique id is given. This can come for example from the serial
number of the USB device. Some manufacturers provide this information
properly, others do not. If you cannot trust the USB serial ID, then
giving a NULL parameter to ofono_modem_create will tell oFono to
generate a unique id itself. Your path will then look like /telit2 or
something like that.
Ah, ok then the patch is fine I think and I like to get it reviewed :)
But I can alter the patch to only search for the modem device and add the
GPS check later to the telit plugin or the GPS atom, if you like.
Best regards,
Bernhard
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