The driver vtables are read-only structures. This patch declares them as
'const' allowing the compiler to (optionally) put them in the RELRO
section. RELRO pages may be marked as read-only by the linker after
the relocations have been done ensuring that they aren't inadvertently
or maliciously altered at runtime.
This is a rudimentary implementation that contains technology and RSSI
and BitErrorRate, plus RSRQ/RSRP for LTE networks. More data can be
added as needed.
This implementations uses the 'Get Signal Strength' QMI method to retrieve
the data. Operator fields (MNC, LAC, etc) can be gotten from the 'Serving
Cell' method if needed, but since this data is already provided in the
NetworkRegistration object it doesn't seem necessary to repeat it here
when an additional communication to the modem is required.
Jonas Bonn
Jonas Bonn