From: Lars Poeschel This patchset adds support for the quectel EC21 LTE modem connected through its serial port. Lars Poeschel (7): quectel: Add Quectel EC21 to known serial modems quectel: use lte atom on EC21 quectel: Query the model before setting up the mux quectel: EC21 needs aux channel to be the first mux channel quectel: EC21 does not understand AT+QIURC voicecall: Quectel modem do not understand AT+CNAP quectel: EC21 add ussd with atmodem driver drivers/atmodem/voicecall.c | 4 +- plugins/quectel.c | 153 +++++++++++++++++++++++------------- 2 files changed, 101 insertions(+), 56 deletions(-) -- 2.26.2