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bus_add_child(9) [osx man page]

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

NAME
BUS_ADD_CHILD -- add a device node to the tree with a given priority SYNOPSIS
#include <sys/param.h> #include <sys/bus.h> int BUS_ADD_CHILD(device_t dev, int order, const char *name, int unit); DESCRIPTION
The BUS_ADD_CHILD() method is used by the driver identify routine to add devices to the tree. Please see device_add_child(9) for more details. The interface is the same as device_add_child(9) however, the bus' BUS_ADD_CHILD() is called. Busses implementing BUS_ADD_CHILD() should insert the device into the tree using device_add_child(9) before adding things such as their own ivars and resource lists to the device. RETURN VALUES
The BUS_ADD_CHILD() method returns device_t added to the tree, or NULL. SEE ALSO
device(9), device_add_child(9), driver(9) AUTHORS
This manual page was written by M. Warner Losh. BSD
May 13, 2004 BSD

Check Out this Related Man Page

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

NAME
DEVICE_IDENTIFY -- identify a device, register it SYNOPSIS
#include <sys/param.h> #include <sys/bus.h> void DEVICE_IDENTIFY(driver_t *driver, device_t parent); DESCRIPTION
The identify function for a device is only needed for devices on busses that cannot identify their children independently, e.g. the ISA bus. It is used to recognize the device (usually done by accessing non-ambiguous registers in the hardware) and to tell the kernel about it and thus creating a new device instance. BUS_ADD_CHILD(9) is used to register the device as a child of the bus. The device's resources (such as IRQ and I/O ports) are registered with the kernel by calling bus_set_resource() for each resource (refer to bus_set_resource(9) for more information). Since the device tree and the device driver tree are disjoint, the DEVICE_IDENTIFY() routine needs to take this into account. If you load and unload your device driver that has the identify routine, the child node has the potential for adding the same node multiple times unless specific measure are taken to preclude that possibility. EXAMPLES
The following pseudo-code shows an example of a function that probes for a piece of hardware and registers it and its resource (an I/O port) with the kernel. void foo_identify(driver_t *driver, device_t parent) { device_t child; retrieve_device_information; if (devices matches one of your supported devices && not already in device tree) { child = BUS_ADD_CHILD(parent, 0, "foo", -1); bus_set_resource(child, SYS_RES_IOPORT, 0, FOO_IOADDR, 1); } } SEE ALSO
BUS_ADD_CHILD(9), bus_set_resource(9), device(9), device_add_child(9), DEVICE_ATTACH(9), DEVICE_DETACH(9), DEVICE_PROBE(9), DEVICE_SHUTDOWN(9) AUTHORS
This manual page was written by Alexander Langer <alex@FreeBSD.org>. BSD
May 13, 2004 BSD
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