.\" Copyright (c) 2000 Alexander Langer
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.\" $FreeBSD: src/share/man/man9/bus_release_resource.9,v 1.2.2.5 2001/12/17 11:30:18 ru Exp $
.\" $DragonFly: src/share/man/man9/bus_release_resource.9,v 1.3 2004/06/01 11:36:53 hmp Exp $
.\"
.Dd May 18, 2000
.Dt BUS_RELEASE_RESOURCE 9
.Os
.Sh NAME
.Nm bus_release_resource
.Nd release resources on a bus
.Sh SYNOPSIS
.In sys/param.h
.In sys/bus.h
.Pp
.In machine/bus.h
.In sys/rman.h
.In machine/resource.h
.Ft int
.Fn bus_release_resource "device_t dev" "int type" "int rid" "struct resource *r"
.Sh DESCRIPTION
Free a resource allocated by
.Xr bus_alloc_resource 9 .
The resource must not be in use on release, i.e. call an appropriate function
before (e.g.\&
.Xr bus_teardown_intr 9
for IRQs).
.Bl -item
.It
.Fa dev
is the device that owns the resource.
.It
.Fa type
is the type of resource that is released.
It must be of the same type you allocated it as before.
See
.Xr bus_alloc_resource 9
for valid types.
.It
.Fa rid
is the resource ID of the resource.
The
.Fa rid
value must be the same as the one returned by
.Xr bus_alloc_resource 9 .
.It
.Fa r
is the pointer to
.Va struct res ,
i.e. the resource itself,
returned by
.Xr bus_alloc_resource 9 .
.El
.Sh RETURN VALUES
.Er EINVAL
is returned, if the device
.Fa dev
has no parent,
.Dv 0
otherwise.
The kernel will panic, if it can't release the resource.
.Sh EXAMPLES
.Bd -literal
	/* deactivate IRQ */
	bus_teardown_intr(dev, foosoftc->irqres, foosoftc->irqid);

	/* release IRQ resource */
	bus_release_resource(dev, SYS_RES_IRQ, foosoftc->irqid,
		foosoftc->irqres);

	/* release I/O port resource */
	bus_release_resource(dev, SYS_RES_IOPORT, foosoftc->portid,
		foosoftc->portres);
.Ed
.Sh SEE ALSO
.Xr bus_alloc_resource 9 ,
.Xr device 9 ,
.Xr driver 9
.Sh AUTHORS
This man page was written by
.An Alexander Langer Aq alex@big.endian.de .