device_t device_get_parent(dev) Get the parent bus of a device.

driver_t device_get_driver(dev) Get pointer to its driver structure.

char *device_get_name(dev) Get the driver name, such as "xxx" for our example.

int device_get_unit(dev) Get the unit number (units are numbered from 0 for the devices associated with each driver).

char *device_get_nameunit(dev) Get the device name including the unit number, such as “xxx0”, “xxx1” and so on.

char *device_get_desc(dev) Get the device description. Normally it describes the exact model of device in human-readable form.

device_set_desc(dev, desc) Set the description. This makes the device description point to the string desc which may not be deallocated or changed after that.

device_set_desc_copy(dev, desc) Set the description. The description is copied into an internal dynamically allocated buffer, so the string desc may be changed afterwards without adverse effects.

void *device_get_softc(dev) Get pointer to the device descriptor (struct xxx_softc) associated with this device.

u_int32_t device_get_flags(dev) Get the flags specified for the device in the configuration file.