2001-03-10 19:34:42 +00:00
|
|
|
.\" -*- nroff -*-
|
|
|
|
|
.\"
|
|
|
|
|
.\" Copyright (c) 2001 Alexander Langer
|
|
|
|
|
.\"
|
|
|
|
|
.\" All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" This program is free software.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
|
|
|
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
|
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
|
|
|
.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
|
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
|
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
|
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
|
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
|
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
|
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
|
|
|
|
.Dd March 10, 2001
|
|
|
|
|
.Dt DEVICE_IDENTIFY 9
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm DEVICE_IDENTIFY
|
|
|
|
|
.Nd identify a device, register it
|
|
|
|
|
.Sh SYNOPSIS
|
2001-10-01 16:09:29 +00:00
|
|
|
.In sys/param.h
|
|
|
|
|
.In sys/bus.h
|
2001-03-10 19:34:42 +00:00
|
|
|
.Ft void
|
|
|
|
|
.Fn DEVICE_IDENTIFY "driver_t *driver" "device_t parent"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The identify function for a device is only needed for devices on busses
|
2002-03-16 18:07:07 +00:00
|
|
|
that cannot identify their children independently, e.g. the ISA bus.
|
2002-01-09 11:43:48 +00:00
|
|
|
It is used to recognize the device (usually done by accessing non-ambiguous
|
2001-03-10 19:34:42 +00:00
|
|
|
registers in the hardware) and to tell the kernel about it and thus
|
|
|
|
|
creating a new device instance.
|
|
|
|
|
.Pp
|
|
|
|
|
.Xr 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
|
|
|
|
|
.Fn bus_set_resource
|
|
|
|
|
for each resource (refer to
|
|
|
|
|
.Xr bus_set_resource 9
|
|
|
|
|
for more information).
|
|
|
|
|
.Sh 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.
|
|
|
|
|
It also sets the description of the device.
|
|
|
|
|
.Bd -literal
|
|
|
|
|
void
|
|
|
|
|
foo_identify(driver_t *driver, device_t parent)
|
|
|
|
|
{
|
|
|
|
|
device_t child;
|
|
|
|
|
|
|
|
|
|
retrieve_device_information;
|
|
|
|
|
if (devices matches one of your supported devices) {
|
|
|
|
|
child = BUS_ADD_CHILD(parent, 0, "foo", -1);
|
|
|
|
|
device_set_desc_copy(child, "foo chip ver.123");
|
|
|
|
|
device_set_driver(child, driver);
|
|
|
|
|
bus_set_resource(child, SYS_RES_IOPORT, 0, FOO_IOADDR, 1);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
.Ed
|
|
|
|
|
.Sh RETURN VALUES
|
|
|
|
|
Zero is returned on success,
|
|
|
|
|
otherwise an appropriate error is returned (see
|
|
|
|
|
.Xr errno 2 ) .
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr BUS_ADD_CHILD 9 ,
|
2001-07-06 16:46:48 +00:00
|
|
|
.Xr bus_set_resource 9 ,
|
|
|
|
|
.Xr device 9 ,
|
2001-03-10 19:34:42 +00:00
|
|
|
.Xr device_add_child 9 ,
|
|
|
|
|
.Xr DEVICE_ATTACH 9 ,
|
|
|
|
|
.Xr DEVICE_DETACH 9 ,
|
|
|
|
|
.Xr DEVICE_PROBE 9 ,
|
2001-07-06 16:46:48 +00:00
|
|
|
.Xr device_set_desc_copy 9 ,
|
|
|
|
|
.Xr device_set_driver 9 ,
|
|
|
|
|
.Xr DEVICE_SHUTDOWN 9
|
2001-03-10 19:34:42 +00:00
|
|
|
.Sh AUTHORS
|
|
|
|
|
This man page was written by
|
|
|
|
|
.An Alexander Langer Aq alex@FreeBSD.org .
|
