NAME

radio - interface between low and high level radio drivers

DESCRIPTION

The radio device driver is divided into a high level, hardware independent layer, and a low level hardware dependent layer. The interface between these is the radio_hw_if structure.
struct radio_hw_if {
        int     (*open)(void *, int, int, struct lwp *);
        int     (*close)(void *, int, int, struct lwp *);
        int     (*get_info)(void *, struct radio_info *);
        int     (*set_info)(void *, struct radio_info *);
        int     (*search)(void *, int);
};

The high level radio driver attaches to the low level driver when the latter calls radio_attach_mi. This call should be

    void
    radio_attach_mi(rhwp, hdlp, dev)
        struct radio_hw_if *rhwp;
        void *hdlp;
        struct device *dev;

The radio_hw_if struct is as shown above. The hdlp argument is a handle to some low level data structure. It is sent as the first argument to all the functions in radio_hw_if when the high level driver calls them. dev is the device struct for the hardware device.

The fields of radio_hw_if are described in some more detail below.

int open (void *, int flags, int fmt, struct lwp *p);
  Optional.
  Is called when the radio device is opened.
  Returns 0 on success, otherwise an error code.
        

int close (void *, int flags, int fmt, struct lwp *p); Optional. Is called when the radio device is closed. Returns 0 on success, otherwise an error code.

int get_info (void *, struct radio_info *); Fill the radio_info struct. Returns 0 on success, otherwise an error code.

int set_info (void *, struct radio_info *); Set values from the radio_info struct. Returns 0 on success, otherwise an error code.

int search (void *, int); Returns 0 on success, otherwise an error code.

SEE ALSO

radio(4)