[PATCH v2 0/6] HID: sony: Add full Dualshock 4 support in Bluetooth mode

This updated set of patches adds NULL pointer checking for the ll_driver
functions and makes the battery calculation code more robust.

The last patch from the first set that checked for duplicate controllers is
on-hold for now as without a guaranteed way to retrieve the MAC address
of a Bluetooth device from a module it has the potential to break.