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Open DPM port automatically in case of IPA net driver

Joel Selvaraj requested to merge joelselvaraj/ModemManager:dpm-open-port into master

In case of IPA driver, an extra step of opening DPM port is required before Get Data Format. In order to open the DPM port, the TX and RX endpoint ID are required. The IPA driver exposes these values through sysfs from linux kernel 5.14 onwards. Read them and open DPM port before Get Data format.

Fixes #391 (closed).

Edited by Aleksander Morgado

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