devclass_get_device(9) [bsd man page]

DEVCLASS_GET_DEVICE(9)					   BSD Kernel Developer's Manual				    DEVCLASS_GET_DEVICE(9)

NAME

     devclass_get_device -- translate unit number to device

SYNOPSIS

     #include <sys/param.h>
     #include <sys/bus.h>

     device_t
     devclass_get_device(devclass_t dc, int unit);

DESCRIPTION

     This function retrieves the device instance with the given unit number and returns it.

RETURN VALUES

     If the device exists, it is returned, otherwise NULL is returned.

SEE ALSO

     devclass(9), device(9)

AUTHORS

     This manual page was written by Doug Rabson.

BSD
								   June 16, 1998							       BSD

DEVCLASS(9)                                                BSD Kernel Developer's Manual                                               DEVCLASS(9)

NAME

     devclass -- object representing a class of devices

SYNOPSIS

     typedef struct devclass *devclass_t;

DESCRIPTION

     The devclass object has two main functions in the system.  The first is to manage the allocation of unit numbers for device instances and the
     second is to hold the list of device drivers for a particular bus type.  Each devclass has a name and there cannot be two devclasses with the
     same name.  This ensures that unique unit numbers are allocated to device instances.

     Beware that this means devclass must be the same for different bus attachments of the same device driver.

SEE ALSO

     devclass_add_driver(9), devclass_delete_driver(9), devclass_find(9), devclass_find_driver(9), devclass_get_device(9),
     devclass_get_devices(9), devclass_get_maxunit(9), devclass_get_name(9), devclass_get_softc(9), device(9), driver(9)

AUTHORS

     This manual page was written by Doug Rabson.

BSD                                                                June 16, 1998                                                               BSD