enum tuner_mode — Mode of the tuner
enum tuner_mode { T_RADIO, T_ANALOG_TV };
Tuner core will work in radio mode
Tuner core will work in analog TV mode
Older boards only had a single tuner device, but some devices have a separate tuner for radio. In any case, the tuner-core needs to know if the tuner chip(s) will be used in radio mode or analog TV mode, as, on radio mode, frequencies are specified on a different range than on TV mode. This enum is used by the tuner core in order to work with the proper tuner range and eventually use a different tuner chip while in radio mode.