* Dan Williams dcbw@redhat.com [180402 15:51]:
On Sun, 2018-04-01 at 10:30 -0700, Tony Lindgren wrote:
- Tony Lindgren tony@atomide.com [180401 15:38]:
Found it! Here's what I need to do over n_gsm:
ngsm 1 "AT+CFUN=1" ngsm 1 "AT+CFUN?" ngsm 2 "AT+EACC=3,0" # enable mic ngsm 2 "AT+CLVL=4" # set speaker volume ngsm 2 "AT+CMUT=0" # unmute mic
I tried to look through the QMI dumps we have in libqmi from 2013 (latest Qualcomm posted) and couldn't find anything to do with mic control, speaker volume, or anything like that.
If the modem supports the AT service (which I think it does? Not looking at the libqmi dumps right now) then it could potentially tunnel these AT commands through QMI too.
Perhaps Qualcomm added something to the Voice service after 2013, or perhaps there are other services that might control speaker/mic that we don't have public dumps for yet though.
OK thanks for checking. So probably only n_gsm channel 1 is for normal Qualcomm at commands, and then channel 2 and others are commands implemented by Motorola on the mdm6600.
I guess we'd have to add support for reading and writing to /dev/gsmtty2 at least as it looks like these cannot be accessed via /dev/ttyUSB4. Or at least I have not figured out any other way to access them.
Regards,
Tony