broadband-modem: new generic steps in initialization/enabling/disabling

Instead of hardcoding the logic to decide which ports are open or closed in the
different steps, we now let the subclasses of MMBroadbandModem to do that
themselves.

We now provide:

  * initialization_started() and initialization_stopped(): the generic
    implementation does the serial port open/close in these steps.

  * enabling_started(): the generic implementation does the serial port opening
    here. The serial ports are kept open as long the modem is in enabled state.

  * disabling_stopped(): the generic implementation does the serial port closing
    here.

0 files changed, 0 insertions, 0 deletions