Function driver_module_handler

freebsd/kern/subr_bus.c:5218–5269

* @brief Module handler for registering device drivers * * This module handler is used to automatically register device * drivers when modules are loaded. If @p what is MOD_LOAD, it calls * devclass_add_driver() for the driver described by the * driver_module_data structure pointed to by @p arg */

 * driver_module_data structure pointed to by @p arg
 */
int
driver_module_handler(module_t mod, int what, void *arg)
{
	struct driver_module_data *dmd;
	devclass_t bus_devclass;
	kobj_class_t driver;
	int error, pass;

	dmd = (struct driver_module_data *)arg;
	bus_devclass = devclass_find_internal(dmd->dmd_busname, NULL, TRUE);
	error = 0;

	switch (what) {
	case MOD_LOAD:
		if (dmd->dmd_chainevh)
			error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);

		pass = dmd->dmd_pass;
		driver = dmd->dmd_driver;
		PDEBUG(("Loading module: driver %s on bus %s (pass %d)",
		    DRIVERNAME(driver), dmd->dmd_busname, pass));
		error = devclass_add_driver(bus_devclass, driver, pass,
		    dmd->dmd_devclass);
		break;

	case MOD_UNLOAD:
		PDEBUG(("Unloading module: driver %s from bus %s",
		    DRIVERNAME(dmd->dmd_driver),
		    dmd->dmd_busname));
		error = devclass_delete_driver(bus_devclass,
		    dmd->dmd_driver);

		if (!error && dmd->dmd_chainevh)
			error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
		break;
	case MOD_QUIESCE:
		PDEBUG(("Quiesce module: driver %s from bus %s",
		    DRIVERNAME(dmd->dmd_driver),
		    dmd->dmd_busname));
		error = devclass_quiesce_driver(bus_devclass,
		    dmd->dmd_driver);

		if (!error && dmd->dmd_chainevh)
			error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
		break;
	default:
		error = EOPNOTSUPP;
		break;
	}

	return (error);
}

/**
 * @brief Enumerate all hinted devices for this bus.