36f13ad1ab
So far we have only created /dev/modem based on the DATA5_CNTL channel available from the modem. The DATAX_CNTL channels allow sending QMI messages to the modem. This is sufficient for oFono to work. Unfortunately, ModemManager currently does not support starting calls through the QMI interface. Instead, it uses serial AT commands that can be alternatively used on all USB-based Qualcomm modems. It turns out that we can also send serial AT commands through the RPMSG interface: the DATAX channels (without _CNTL) all respond to serial AT commands. We set it up at /dev/modem-at, configure ModemManager accordingly and then we are able to start calls. Yay!
14 lines
482 B
Text
14 lines
482 B
Text
SUBSYSTEM!="rpmsg", GOTO="qcom_rpmsg_end"
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# symlink rpmsg endpoints under useful names
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ATTR{name}=="DATA5_CNTL", SYMLINK+="modem"
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ATTR{name}=="DATA4", SYMLINK+="modem-at"
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# open SMD channels when the remoteproc comes up
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KERNEL!="rpmsg_ctrl[0-9]*", GOTO="qcom_rpmsg_end"
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ATTRS{rpmsg_name}!="modem|hexagon", GOTO="qcom_rpmsg_end"
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ACTION=="add", RUN+="/usr/sbin/rpmsgexport /dev/$name DATA5_CNTL"
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ACTION=="add", RUN+="/usr/sbin/rpmsgexport /dev/$name DATA4"
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LABEL="qcom_rpmsg_end"
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