RADIO(9) | Kernel Developer's Manual | RADIO(9) |
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.
December 20, 2005 | NetBSD 6.1 |