bus_new_pass(9) [freebsd man page]

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

NAME

     BUS_NEW_PASS -- notify a bus that the pass level has been changed

SYNOPSIS

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

     void
     BUS_NEW_PASS(device_t dev);

DESCRIPTION

     The BUS_NEW_PASS() method is called on each bus device to rescan the device tree when the pass level has been changed.  This method is
     responsible for invoking BUS_NEW_PASS(9) on child bus devices to propagate the rescan to child devices.  It is also responsible for reprobing
     any unattached child devices and allowing drivers for the current pass to identify new children.  A default implementation is provided by
     bus_generic_new_pass(9).

SEE ALSO

     bus_generic_new_pass(9), bus_set_pass(9), device(9)

BSD
								   June 8, 2009 							       BSD

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