RS-232 drivers now need to register any device
they are handling in the hw_proxy.rs232_devices map.
This will prevent other drivers from probing them,
possibly messing up with the device.
Any update to rs232_devices must be done while holding
the hw_proxy.rs232_lock.
The hw_scale driver will be updated to use this mechanism
in the next commit, that will also handle a new RS-232
scale protocol.
POSBoxes will be registered with the government. If a POSBox is not
registered it won't load the blackbox driver, preventing communication
with the Fiscal Data Module.
After plugging in multiple identical serial to USB interfaces, only the
last one will be available under /dev/serial/by-id/ because they'll have
identical IDs. Instead use /dev/serial/by-path/ which does not have this
issue.
Olivier Dony
Joren Van Onder