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This is a simple module that keeps a list of connected GB audio
modules.

Whenever a device is attached, an appropriate uevent is sent to
userspace:

    UDEV  [4941.803215] add      /kernel/gb_audio_manager/0 (gb_audio_manager)
    ACTION=add
    CPORT=99
    DEVICES=0x10
    DEVPATH=/kernel/gb_audio_manager/0
    NAME=naim
    PID=64
    SEQNUM=1828
    SLOT=2
    SUBSYSTEM=gb_audio_manager
    USEC_INITIALIZED=802416
    VID=128

And whenever removed:

    UDEV  [4941.836588] remove   /kernel/gb_audio_manager/0 (gb_audio_manager)
    ACTION=remove
    DEVPATH=/kernel/gb_audio_manager/0
    SEQNUM=1833
    SUBSYSTEM=gb_audio_manager
    USEC_INITIALIZED=835681

The API consists of functions for adding, removing and inspecting
added device module descriptions (struct gb_audio_module):

    int                         gb_audio_manager_add(struct gb_audio_module_descriptor *desc);
    int                         gb_audio_manager_remove(int id);
    int                     ...